batch proposer: only sleep if we failed to create batch (#388)

Co-authored-by: HAOYUatHZ <37070449+HAOYUatHZ@users.noreply.github.com>

.github/workflows/contracts.yaml

@@ -2,26 +2,10 @@ name: Contracts
 
 on:
   push:
-    branches:
-      - master
-      - main
-      - prod
-      - release/*
-      - staging
-      - develop
-      - alpha
     paths:
       - 'contracts/**'
       - '.github/workflows/contracts.yaml'
   pull_request:
-    branches:
-      - master
-      - main
-      - prod
-      - release/*
-      - staging
-      - develop
-      - alpha
     paths:
       - 'contracts/**'
       - '.github/workflows/contracts.yaml'
@@ -44,6 +28,9 @@ jobs:
         uses: foundry-rs/foundry-toolchain@v1
         with:
           version: nightly
+      
+      - name: Setup LCOV
+        uses: hrishikesh-kadam/setup-lcov@v1
 
       - name: Install Node.js 14
         uses: actions/setup-node@v2
@@ -80,6 +67,22 @@ jobs:
       - name: Run foundry tests
         run: forge test -vvv
 
+      - name: Run foundry coverage
+        run : forge coverage --report lcov
+
+      - name : Prune coverage
+        run : lcov --remove ./lcov.info -o ./lcov.info.pruned 'src/mocks/*' 'src/test/*' 'scripts/*' 'node_modules/*' 'lib/*'
+
+      - name: Report code coverage
+        uses: zgosalvez/github-actions-report-lcov@v3
+        with:
+          coverage-files: contracts/lcov.info.pruned
+          minimum-coverage: 0
+          artifact-name: code-coverage-report
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          working-directory: contracts
+          update-comment: true
+
   hardhat:
     runs-on: ubuntu-latest
 

Jenkinsfile

@@ -63,42 +63,42 @@ pipeline {
             parallel{
                 stage('Test bridge package') {
                     steps {
-                        sh 'go test -v -race -coverprofile=coverage.bridge.txt -covermode=atomic -p 1 scroll-tech/bridge/...'
+                        sh 'go test -v -coverprofile=coverage.bridge.txt -covermode=atomic -p 1 scroll-tech/bridge/...'
                     }
                 }
                 stage('Test common package') {
                     steps {
-                        sh 'go test -v -race -coverprofile=coverage.common.txt -covermode=atomic -p 1 scroll-tech/common/...'
+                        sh 'go test -v -coverprofile=coverage.common.txt -covermode=atomic -p 1 scroll-tech/common/...'
                     }
                 }
                 stage('Test coordinator package') {
                     steps {
-                        sh 'go test -v -race -coverprofile=coverage.coordinator.txt -covermode=atomic -p 1 scroll-tech/coordinator/...'
+                        sh 'go test -v -coverprofile=coverage.coordinator.txt -covermode=atomic -p 1 scroll-tech/coordinator/...'
                     }
                 }
                 stage('Test database package') {
                     steps {
-                        sh 'go test -v -race -coverprofile=coverage.db.txt -covermode=atomic -p 1 scroll-tech/database/...'
+                        sh 'go test -v -coverprofile=coverage.db.txt -covermode=atomic -p 1 scroll-tech/database/...'
                     }
                 }
                 stage('Integration test') {
                     steps {
-                        sh 'go test -v -race -tags="mock_prover mock_verifier" -coverprofile=coverage.integration.txt -covermode=atomic -p 1 scroll-tech/integration-test/...'
+                        sh 'go test -v -tags="mock_prover mock_verifier" -coverprofile=coverage.integration.txt -covermode=atomic -p 1 scroll-tech/integration-test/...'
                     }
                 }
                 stage('Race test bridge package') {
                     steps {
-                        sh "cd bridge && go test -v -race -coverprofile=coverage.txt -covermode=atomic \$(go list ./... | grep -v 'database\\|common\\|l1\\|l2\\|coordinator')"
+                        sh 'go test -v -race -coverprofile=coverage.txt -covermode=atomic scroll-tech/bridge/...'
                     }
                 }
                 stage('Race test coordinator package') {
                     steps {
-                        sh "cd coordinator && go test -v -race -coverprofile=coverage.txt -covermode=atomic \$(go list ./... | grep -v 'database\\|common\\|l1\\|l2\\|coordinator')"
+                        sh 'go test -v -race -coverprofile=coverage.txt -covermode=atomic scroll-tech/coordinator/...'
                     }
                 }
                 stage('Race test database package') {
                     steps {
-                        sh "cd database && go test -v -race -coverprofile=coverage.txt -covermode=atomic \$(go list ./... | grep -v 'database\\|common\\|l1\\|l2\\|coordinator')"
+                        sh 'go test -v -race -coverprofile=coverage.txt -covermode=atomic scroll-tech/database/...'
                     }
                 }
             }

Makefile

@@ -16,11 +16,11 @@ lint: ## The code's format and security checks.
 
 update: ## update dependencies
 	go work sync
-	cd $(PWD)/bridge/ && go get -u github.com/scroll-tech/go-ethereum@staging && go mod tidy
-	cd $(PWD)/common/ && go get -u github.com/scroll-tech/go-ethereum@staging && go mod tidy
-	cd $(PWD)/coordinator/ && go get -u github.com/scroll-tech/go-ethereum@staging && go mod tidy
-	cd $(PWD)/database/ && go get -u github.com/scroll-tech/go-ethereum@staging && go mod tidy
-	cd $(PWD)/roller/ && go get -u github.com/scroll-tech/go-ethereum@staging && go mod tidy
+	cd $(PWD)/bridge/ && go get -u github.com/scroll-tech/go-ethereum@scroll && go mod tidy
+	cd $(PWD)/common/ && go get -u github.com/scroll-tech/go-ethereum@scroll && go mod tidy
+	cd $(PWD)/coordinator/ && go get -u github.com/scroll-tech/go-ethereum@scroll && go mod tidy
+	cd $(PWD)/database/ && go get -u github.com/scroll-tech/go-ethereum@scroll && go mod tidy
+	cd $(PWD)/roller/ && go get -u github.com/scroll-tech/go-ethereum@scroll && go mod tidy
 	goimports -local $(PWD)/bridge/ -w .
 	goimports -local $(PWD)/common/ -w .
 	goimports -local $(PWD)/coordinator/ -w .

bridge/config/l2_config.go

@@ -40,6 +40,8 @@ type BatchProposerConfig struct {
 	BatchBlocksLimit uint64 `json:"batch_blocks_limit"`
 	// Commit tx calldata size limit in bytes, target to cap the gas use of commit tx at 2M gas
 	CommitTxCalldataSizeLimit uint64 `json:"commit_tx_calldata_size_limit"`
+	// Commit tx calldata min size limit in bytes
+	CommitTxCalldataMinSize uint64 `json:"commit_tx_calldata_min_size,omitempty"`
 	// The public input hash config
 	PublicInputConfig *types.PublicInputHashConfig `json:"public_input_config"`
 }

bridge/config/relayer_config.go

@@ -51,6 +51,8 @@ type RelayerConfig struct {
 	GasOracleConfig *GasOracleConfig `json:"gas_oracle_config"`
 	// The interval in which we send finalize batch transactions.
 	FinalizeBatchIntervalSec uint64 `json:"finalize_batch_interval_sec"`
+	// MessageRelayMinGasLimit to avoid OutOfGas error
+	MessageRelayMinGasLimit uint64 `json:"message_relay_min_gas_limit,omitempty"`
 	// The private key of the relayer
 	MessageSenderPrivateKeys   []*ecdsa.PrivateKey `json:"-"`
 	GasOracleSenderPrivateKeys []*ecdsa.PrivateKey `json:"-"`

bridge/go.mod

@@ -4,7 +4,7 @@ go 1.18
 
 require (
 	github.com/orcaman/concurrent-map v1.0.0
-	github.com/scroll-tech/go-ethereum v1.10.14-0.20230306131930-03b4de32b78b
+	github.com/scroll-tech/go-ethereum v1.10.14-0.20230321020420-127af384ed04
 	github.com/stretchr/testify v1.8.2
 	github.com/urfave/cli/v2 v2.17.2-0.20221006022127-8f469abc00aa
 	golang.org/x/sync v0.1.0
@@ -28,7 +28,7 @@ require (
 	github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 // indirect
 	github.com/rjeczalik/notify v0.9.1 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/scroll-tech/zktrie v0.5.0 // indirect
+	github.com/scroll-tech/zktrie v0.5.2 // indirect
 	github.com/shirou/gopsutil v3.21.11+incompatible // indirect
 	github.com/tklauser/go-sysconf v0.3.10 // indirect
 	github.com/tklauser/numcpus v0.4.0 // indirect
@@ -36,6 +36,7 @@ require (
 	github.com/yusufpapurcu/wmi v1.2.2 // indirect
 	golang.org/x/crypto v0.7.0 // indirect
 	golang.org/x/sys v0.6.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

bridge/go.sum

@@ -48,6 +48,11 @@ github.com/jackpal/go-nat-pmp v1.0.2 h1:KzKSgb7qkJvOUTqYl9/Hg/me3pWgBmERKrTGD7Bd
 github.com/jessevdk/go-flags v0.0.0-20141203071132-1679536dcc89/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
 github.com/jrick/logrotate v1.0.0/go.mod h1:LNinyqDIJnpAur+b8yyulnQw/wDuN1+BYKlTRt3OuAQ=
 github.com/kkdai/bstream v0.0.0-20161212061736-f391b8402d23/go.mod h1:J+Gs4SYgM6CZQHDETBtE9HaSEkGmuNXF86RwHhHUvq4=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/leanovate/gopter v0.2.9 h1:fQjYxZaynp97ozCzfOyOuAGOU4aU/z37zf/tOujFk7c=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
 github.com/mattn/go-isatty v0.0.16 h1:bq3VjFmv/sOjHtdEhmkEV4x1AJtvUvOJ2PFAZ5+peKQ=
@@ -69,13 +74,14 @@ github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 h1:OdAsTTz6O
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
 github.com/rjeczalik/notify v0.9.1 h1:CLCKso/QK1snAlnhNR/CNvNiFU2saUtjV0bx3EwNeCE=
 github.com/rjeczalik/notify v0.9.1/go.mod h1:rKwnCoCGeuQnwBtTSPL9Dad03Vh2n40ePRrjvIXnJho=
+github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
 github.com/rs/cors v1.7.0 h1:+88SsELBHx5r+hZ8TCkggzSstaWNbDvThkVK8H6f9ik=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/scroll-tech/go-ethereum v1.10.14-0.20230306131930-03b4de32b78b h1:shNTzAnD2oDcDCrM4aaVCTzQNVfYxF1An08R2H2DLAg=
-github.com/scroll-tech/go-ethereum v1.10.14-0.20230306131930-03b4de32b78b/go.mod h1:f9ygxrxL7WRCTzuloV+t/UlcxMq3AL+gcNU60liiNNU=
-github.com/scroll-tech/zktrie v0.5.0 h1:dABDR6lMZq6Hs+fWQSiHbX8s3AOX6hY+5nkhSYm5rmU=
-github.com/scroll-tech/zktrie v0.5.0/go.mod h1:XvNo7vAk8yxNyTjBDj5WIiFzYW4bx/gJ78+NK6Zn6Uk=
+github.com/scroll-tech/go-ethereum v1.10.14-0.20230321020420-127af384ed04 h1:PpI31kaBVm6+7sZtyK03Ex0QIg3P821Ktae0FHFh7IM=
+github.com/scroll-tech/go-ethereum v1.10.14-0.20230321020420-127af384ed04/go.mod h1:jH8c08L9K8Hieaf0r/ur2P/cpesn4dFhmLm2Mmoi8kI=
+github.com/scroll-tech/zktrie v0.5.2 h1:U34jPXMLGOlRHfdvYp5VVgOcC0RuPeJmcS3bWotCWiY=
+github.com/scroll-tech/zktrie v0.5.2/go.mod h1:XvNo7vAk8yxNyTjBDj5WIiFzYW4bx/gJ78+NK6Zn6Uk=
 github.com/shirou/gopsutil v3.21.11+incompatible h1:+1+c1VGhc88SSonWP6foOcLhvnKlUeu/erjjvaPEYiI=
 github.com/shirou/gopsutil v3.21.11+incompatible/go.mod h1:5b4v6he4MtMOwMlS0TUMTu2PcXUg8+E1lC7eC3UO/RA=
 github.com/status-im/keycard-go v0.2.0 h1:QDLFswOQu1r5jsycloeQh3bVU8n/NatHHaZobtDnDzA=
@@ -113,8 +119,9 @@ golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.8.0 h1:57P1ETyNKtuIjB4SRd15iJxuhj8Gc416Y78H3qgMh68=
 golang.org/x/time v0.0.0-20220922220347-f3bd1da661af h1:Yx9k8YCG3dvF87UAn2tu2HQLf2dt/eR1bXxpLMWeH+Y=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce h1:+JknDZhAj8YMt7GC73Ei8pv4MzjDUNPHgQWJdtMAaDU=
 gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce/go.mod h1:5AcXVHNjg+BDxry382+8OKon8SEWiKktQR07RKPsv1c=

bridge/l1/relayer.go

@@ -35,6 +35,8 @@ const (
 	gasPriceDiffPrecision = 1000000
 
 	defaultGasPriceDiff = 50000 // 5%
+
+	defaultMessageRelayMinGasLimit = 130000 // should be enough for both ERC20 and ETH relay
 )
 
 // Layer1Relayer is responsible for
@@ -58,6 +60,8 @@ type Layer1Relayer struct {
 	gasOracleCh     <-chan *sender.Confirmation
 	l1GasOracleABI  *abi.ABI
 
+	minGasLimitForMessageRelay uint64
+
 	lastGasPrice uint64
 	minGasPrice  uint64
 	gasPriceDiff uint64
@@ -92,6 +96,11 @@ func NewLayer1Relayer(ctx context.Context, db database.OrmFactory, cfg *config.R
 		gasPriceDiff = defaultGasPriceDiff
 	}
 
+	minGasLimitForMessageRelay := uint64(defaultMessageRelayMinGasLimit)
+	if cfg.MessageRelayMinGasLimit != 0 {
+		minGasLimitForMessageRelay = cfg.MessageRelayMinGasLimit
+	}
+
 	return &Layer1Relayer{
 		ctx: ctx,
 		db:  db,
@@ -104,6 +113,8 @@ func NewLayer1Relayer(ctx context.Context, db database.OrmFactory, cfg *config.R
 		gasOracleCh:     gasOracleSender.ConfirmChan(),
 		l1GasOracleABI:  bridge_abi.L1GasPriceOracleABI,
 
+		minGasLimitForMessageRelay: minGasLimitForMessageRelay,
+
 		minGasPrice:  minGasPrice,
 		gasPriceDiff: gasPriceDiff,
 
@@ -138,7 +149,7 @@ func (r *Layer1Relayer) ProcessSavedEvents() {
 func (r *Layer1Relayer) processSavedEvent(msg *types.L1Message) error {
 	calldata := common.Hex2Bytes(msg.Calldata)
 
-	hash, err := r.messageSender.SendTransaction(msg.MsgHash, &r.cfg.MessengerContractAddress, big.NewInt(0), calldata)
+	hash, err := r.messageSender.SendTransaction(msg.MsgHash, &r.cfg.MessengerContractAddress, big.NewInt(0), calldata, r.minGasLimitForMessageRelay)
 	if err != nil && err.Error() == "execution reverted: Message expired" {
 		return r.db.UpdateLayer1Status(r.ctx, msg.MsgHash, types.MsgExpired)
 	}
@@ -190,7 +201,7 @@ func (r *Layer1Relayer) ProcessGasPriceOracle() {
 				return
 			}
 
-			hash, err := r.gasOracleSender.SendTransaction(block.Hash, &r.cfg.GasPriceOracleContractAddress, big.NewInt(0), data)
+			hash, err := r.gasOracleSender.SendTransaction(block.Hash, &r.cfg.GasPriceOracleContractAddress, big.NewInt(0), data, 0)
 			if err != nil {
 				if !errors.Is(err, sender.ErrNoAvailableAccount) {
 					log.Error("Failed to send setL1BaseFee tx to layer2 ", "block.Hash", block.Hash, "block.Height", block.Number, "err", err)

bridge/l2/batch_proposer.go

@@ -80,6 +80,7 @@ type BatchProposer struct {
 	batchCommitTimeSec       uint64
 	commitCalldataSizeLimit  uint64
 	batchDataBufferSizeLimit uint64
+	commitCalldataMinSize    uint64
 
 	proofGenerationFreq uint64
 	batchDataBuffer     []*types.BatchData
@@ -102,6 +103,7 @@ func NewBatchProposer(ctx context.Context, cfg *config.BatchProposerConfig, rela
 		batchBlocksLimit:         cfg.BatchBlocksLimit,
 		batchCommitTimeSec:       cfg.BatchCommitTimeSec,
 		commitCalldataSizeLimit:  cfg.CommitTxCalldataSizeLimit,
+		commitCalldataMinSize:    cfg.CommitTxCalldataMinSize,
 		batchDataBufferSizeLimit: 100*cfg.CommitTxCalldataSizeLimit + 1*1024*1024, // @todo: determine the value.
 		proofGenerationFreq:      cfg.ProofGenerationFreq,
 		piCfg:                    cfg.PublicInputConfig,
@@ -217,7 +219,7 @@ func (p *BatchProposer) tryProposeBatch() {
 	p.mutex.Lock()
 	defer p.mutex.Unlock()
 
-	if p.getBatchDataBufferSize() < p.batchDataBufferSizeLimit {
+	for p.getBatchDataBufferSize() < p.batchDataBufferSizeLimit {
 		blocks, err := p.orm.GetUnbatchedL2Blocks(
 			map[string]interface{}{},
 			fmt.Sprintf("order by number ASC LIMIT %d", p.batchBlocksLimit),
@@ -227,7 +229,18 @@ func (p *BatchProposer) tryProposeBatch() {
 			return
 		}
 
-		p.proposeBatch(blocks)
+		batchCreated := p.proposeBatch(blocks)
+
+		// while size of batchDataBuffer < commitCalldataMinSize,
+		// proposer keeps fetching and porposing batches.
+		if p.getBatchDataBufferSize() >= p.commitCalldataMinSize {
+			return
+		}
+
+		if !batchCreated {
+			// wait for watcher to insert l2 traces.
+			time.Sleep(time.Second)
+		}
 	}
 }
 
@@ -276,9 +289,9 @@ func (p *BatchProposer) tryCommitBatches() {
 	}
 }
 
-func (p *BatchProposer) proposeBatch(blocks []*types.BlockInfo) {
+func (p *BatchProposer) proposeBatch(blocks []*types.BlockInfo) bool {
 	if len(blocks) == 0 {
-		return
+		return false
 	}
 
 	if blocks[0].GasUsed > p.batchGasThreshold {
@@ -291,7 +304,7 @@ func (p *BatchProposer) proposeBatch(blocks []*types.BlockInfo) {
 			bridgeL2BatchesGasCreatedRateMeter.Mark(int64(blocks[0].GasUsed))
 			bridgeL2BatchesCreatedRateMeter.Mark(1)
 		}
-		return
+		return true
 	}
 
 	if blocks[0].TxNum > p.batchTxNumThreshold {
@@ -304,7 +317,7 @@ func (p *BatchProposer) proposeBatch(blocks []*types.BlockInfo) {
 			bridgeL2BatchesGasCreatedRateMeter.Mark(int64(blocks[0].GasUsed))
 			bridgeL2BatchesCreatedRateMeter.Mark(1)
 		}
-		return
+		return true
 	}
 
 	var gasUsed, txNum uint64
@@ -324,7 +337,7 @@ func (p *BatchProposer) proposeBatch(blocks []*types.BlockInfo) {
 	// if it's not old enough we will skip proposing the batch,
 	// otherwise we will still propose a batch
 	if !reachThreshold && blocks[0].BlockTimestamp+p.batchTimeSec > uint64(time.Now().Unix()) {
-		return
+		return false
 	}
 
 	if err := p.createBatchForBlocks(blocks); err != nil {
@@ -334,6 +347,8 @@ func (p *BatchProposer) proposeBatch(blocks []*types.BlockInfo) {
 		bridgeL2BatchesGasCreatedRateMeter.Mark(int64(gasUsed))
 		bridgeL2BatchesCreatedRateMeter.Mark(int64(len(blocks)))
 	}
+
+	return true
 }
 
 func (p *BatchProposer) createBatchForBlocks(blocks []*types.BlockInfo) error {

bridge/l2/relayer.go

@@ -44,6 +44,8 @@ const (
 	gasPriceDiffPrecision = 1000000
 
 	defaultGasPriceDiff = 50000 // 5%
+
+	defaultMessageRelayMinGasLimit = 200000 // should be enough for both ERC20 and ETH relay
 )
 
 // Layer2Relayer is responsible for
@@ -72,6 +74,8 @@ type Layer2Relayer struct {
 	gasOracleCh     <-chan *sender.Confirmation
 	l2GasOracleABI  *abi.ABI
 
+	minGasLimitForMessageRelay uint64
+
 	lastGasPrice uint64
 	minGasPrice  uint64
 	gasPriceDiff uint64
@@ -122,6 +126,11 @@ func NewLayer2Relayer(ctx context.Context, l2Client *ethclient.Client, db databa
 		gasPriceDiff = defaultGasPriceDiff
 	}
 
+	minGasLimitForMessageRelay := uint64(defaultMessageRelayMinGasLimit)
+	if cfg.MessageRelayMinGasLimit != 0 {
+		minGasLimitForMessageRelay = cfg.MessageRelayMinGasLimit
+	}
+
 	return &Layer2Relayer{
 		ctx: ctx,
 		db:  db,
@@ -140,6 +149,8 @@ func NewLayer2Relayer(ctx context.Context, l2Client *ethclient.Client, db databa
 		gasOracleCh:     gasOracleSender.ConfirmChan(),
 		l2GasOracleABI:  bridge_abi.L2GasPriceOracleABI,
 
+		minGasLimitForMessageRelay: minGasLimitForMessageRelay,
+
 		minGasPrice:  minGasPrice,
 		gasPriceDiff: gasPriceDiff,
 
@@ -232,7 +243,7 @@ func (r *Layer2Relayer) processSavedEvent(msg *types.L2Message) error {
 		return err
 	}
 
-	hash, err := r.messageSender.SendTransaction(msg.MsgHash, &r.cfg.MessengerContractAddress, big.NewInt(0), data)
+	hash, err := r.messageSender.SendTransaction(msg.MsgHash, &r.cfg.MessengerContractAddress, big.NewInt(0), data, r.minGasLimitForMessageRelay)
 	if err != nil && err.Error() == "execution reverted: Message expired" {
 		return r.db.UpdateLayer2Status(r.ctx, msg.MsgHash, types.MsgExpired)
 	}
@@ -284,7 +295,7 @@ func (r *Layer2Relayer) ProcessGasPriceOracle() {
 				return
 			}
 
-			hash, err := r.gasOracleSender.SendTransaction(batch.Hash, &r.cfg.GasPriceOracleContractAddress, big.NewInt(0), data)
+			hash, err := r.gasOracleSender.SendTransaction(batch.Hash, &r.cfg.GasPriceOracleContractAddress, big.NewInt(0), data, 0)
 			if err != nil {
 				if !errors.Is(err, sender.ErrNoAvailableAccount) {
 					log.Error("Failed to send setL2BaseFee tx to layer2 ", "batch.Hash", batch.Hash, "err", err)
@@ -330,7 +341,7 @@ func (r *Layer2Relayer) SendCommitTx(batchData []*types.BatchData) error {
 		bytes = append(bytes, batch.Hash().Bytes()...)
 	}
 	txID := crypto.Keccak256Hash(bytes).String()
-	txHash, err := r.rollupSender.SendTransaction(txID, &r.cfg.RollupContractAddress, big.NewInt(0), calldata)
+	txHash, err := r.rollupSender.SendTransaction(txID, &r.cfg.RollupContractAddress, big.NewInt(0), calldata, 0)
 	if err != nil {
 		if !errors.Is(err, sender.ErrNoAvailableAccount) {
 			log.Error("Failed to send commitBatches tx to layer1 ", "err", err)
@@ -479,7 +490,7 @@ func (r *Layer2Relayer) ProcessCommittedBatches() {
 
 		txID := hash + "-finalize"
 		// add suffix `-finalize` to avoid duplication with commit tx in unit tests
-		txHash, err := r.rollupSender.SendTransaction(txID, &r.cfg.RollupContractAddress, big.NewInt(0), data)
+		txHash, err := r.rollupSender.SendTransaction(txID, &r.cfg.RollupContractAddress, big.NewInt(0), data, 0)
 		finalizeTxHash := &txHash
 		if err != nil {
 			if !errors.Is(err, sender.ErrNoAvailableAccount) {

bridge/l2/watcher_test.go

@@ -45,7 +45,7 @@ func testCreateNewWatcherAndStop(t *testing.T) {
 	numTransactions := 3
 	toAddress := common.HexToAddress("0x4592d8f8d7b001e72cb26a73e4fa1806a51ac79d")
 	for i := 0; i < numTransactions; i++ {
-		_, err = newSender.SendTransaction(strconv.Itoa(1000+i), &toAddress, big.NewInt(1000000000), nil)
+		_, err = newSender.SendTransaction(strconv.Itoa(1000+i), &toAddress, big.NewInt(1000000000), nil, 0)
 		assert.NoError(t, err)
 		<-newSender.ConfirmChan()
 	}

bridge/sender/estimategas.go

@@ -9,12 +9,12 @@ import (
 	"github.com/scroll-tech/go-ethereum/common"
 )
 
-func (s *Sender) estimateLegacyGas(auth *bind.TransactOpts, contract *common.Address, value *big.Int, input []byte) (*FeeData, error) {
+func (s *Sender) estimateLegacyGas(auth *bind.TransactOpts, contract *common.Address, value *big.Int, input []byte, minGasLimit uint64) (*FeeData, error) {
 	gasPrice, err := s.client.SuggestGasPrice(s.ctx)
 	if err != nil {
 		return nil, err
 	}
-	gasLimit, err := s.estimateGasLimit(auth, contract, input, gasPrice, nil, nil, value)
+	gasLimit, err := s.estimateGasLimit(auth, contract, input, gasPrice, nil, nil, value, minGasLimit)
 	if err != nil {
 		return nil, err
 	}
@@ -24,7 +24,7 @@ func (s *Sender) estimateLegacyGas(auth *bind.TransactOpts, contract *common.Add
 	}, nil
 }
 
-func (s *Sender) estimateDynamicGas(auth *bind.TransactOpts, contract *common.Address, value *big.Int, input []byte) (*FeeData, error) {
+func (s *Sender) estimateDynamicGas(auth *bind.TransactOpts, contract *common.Address, value *big.Int, input []byte, minGasLimit uint64) (*FeeData, error) {
 	gasTipCap, err := s.client.SuggestGasTipCap(s.ctx)
 	if err != nil {
 		return nil, err
@@ -38,7 +38,7 @@ func (s *Sender) estimateDynamicGas(auth *bind.TransactOpts, contract *common.Ad
 		gasTipCap,
 		new(big.Int).Mul(baseFee, big.NewInt(2)),
 	)
-	gasLimit, err := s.estimateGasLimit(auth, contract, input, nil, gasTipCap, gasFeeCap, value)
+	gasLimit, err := s.estimateGasLimit(auth, contract, input, nil, gasTipCap, gasFeeCap, value, minGasLimit)
 	if err != nil {
 		return nil, err
 	}
@@ -49,7 +49,7 @@ func (s *Sender) estimateDynamicGas(auth *bind.TransactOpts, contract *common.Ad
 	}, nil
 }
 
-func (s *Sender) estimateGasLimit(opts *bind.TransactOpts, contract *common.Address, input []byte, gasPrice, gasTipCap, gasFeeCap, value *big.Int) (uint64, error) {
+func (s *Sender) estimateGasLimit(opts *bind.TransactOpts, contract *common.Address, input []byte, gasPrice, gasTipCap, gasFeeCap, value *big.Int, minGasLimit uint64) (uint64, error) {
 	msg := ethereum.CallMsg{
 		From:      opts.From,
 		To:        contract,
@@ -63,6 +63,10 @@ func (s *Sender) estimateGasLimit(opts *bind.TransactOpts, contract *common.Addr
 	if err != nil {
 		return 0, err
 	}
+	if minGasLimit > gasLimit {
+		gasLimit = minGasLimit
+	}
+
 	gasLimit = gasLimit * 15 / 10 // 50% extra gas to void out of gas error
 
 	return gasLimit, nil

bridge/sender/sender.go

@@ -150,15 +150,15 @@ func (s *Sender) NumberOfAccounts() int {
 	return len(s.auths.accounts)
 }
 
-func (s *Sender) getFeeData(auth *bind.TransactOpts, target *common.Address, value *big.Int, data []byte) (*FeeData, error) {
+func (s *Sender) getFeeData(auth *bind.TransactOpts, target *common.Address, value *big.Int, data []byte, minGasLimit uint64) (*FeeData, error) {
 	if s.config.TxType == DynamicFeeTxType {
-		return s.estimateDynamicGas(auth, target, value, data)
+		return s.estimateDynamicGas(auth, target, value, data, minGasLimit)
 	}
-	return s.estimateLegacyGas(auth, target, value, data)
+	return s.estimateLegacyGas(auth, target, value, data, minGasLimit)
 }
 
 // SendTransaction send a signed L2tL1 transaction.
-func (s *Sender) SendTransaction(ID string, target *common.Address, value *big.Int, data []byte) (hash common.Hash, err error) {
+func (s *Sender) SendTransaction(ID string, target *common.Address, value *big.Int, data []byte, minGasLimit uint64) (hash common.Hash, err error) {
 	// We occupy the ID, in case some other threads call with the same ID in the same time
 	if _, loaded := s.pendingTxs.LoadOrStore(ID, nil); loaded {
 		return common.Hash{}, fmt.Errorf("has the repeat tx ID, ID: %s", ID)
@@ -182,7 +182,7 @@ func (s *Sender) SendTransaction(ID string, target *common.Address, value *big.I
 		tx      *types.Transaction
 	)
 	// estimate gas fee
-	if feeData, err = s.getFeeData(auth, target, value, data); err != nil {
+	if feeData, err = s.getFeeData(auth, target, value, data, minGasLimit); err != nil {
 		return
 	}
 	if tx, err = s.createAndSendTx(auth, feeData, target, value, data, nil); err == nil {

bridge/sender/sender_test.go

@@ -14,6 +14,7 @@ import (
 	cmap "github.com/orcaman/concurrent-map"
 	"github.com/scroll-tech/go-ethereum/common"
 	"github.com/scroll-tech/go-ethereum/crypto"
+	"github.com/scroll-tech/go-ethereum/ethclient"
 	"github.com/scroll-tech/go-ethereum/rpc"
 	"github.com/stretchr/testify/assert"
 
@@ -56,11 +57,38 @@ func TestSender(t *testing.T) {
 	// Setup
 	setupEnv(t)
 
+	t.Run("test min gas limit", func(t *testing.T) { testMinGasLimit(t) })
+
 	t.Run("test 1 account sender", func(t *testing.T) { testBatchSender(t, 1) })
 	t.Run("test 3 account sender", func(t *testing.T) { testBatchSender(t, 3) })
 	t.Run("test 8 account sender", func(t *testing.T) { testBatchSender(t, 8) })
 }
 
+func testMinGasLimit(t *testing.T) {
+	senderCfg := cfg.L1Config.RelayerConfig.SenderConfig
+	senderCfg.Confirmations = rpc.LatestBlockNumber
+	newSender, err := sender.NewSender(context.Background(), senderCfg, privateKeys)
+	assert.NoError(t, err)
+	defer newSender.Stop()
+
+	client, err := ethclient.Dial(senderCfg.Endpoint)
+	assert.NoError(t, err)
+
+	// MinGasLimit = 0
+	txHash0, err := newSender.SendTransaction("0", &common.Address{}, big.NewInt(1), nil, 0)
+	assert.NoError(t, err)
+	tx0, _, err := client.TransactionByHash(context.Background(), txHash0)
+	assert.NoError(t, err)
+	assert.Greater(t, tx0.Gas(), uint64(0))
+
+	// MinGasLimit = 100000
+	txHash1, err := newSender.SendTransaction("1", &common.Address{}, big.NewInt(1), nil, 100000)
+	assert.NoError(t, err)
+	tx1, _, err := client.TransactionByHash(context.Background(), txHash1)
+	assert.NoError(t, err)
+	assert.Equal(t, tx1.Gas(), uint64(150000))
+}
+
 func testBatchSender(t *testing.T, batchSize int) {
 	for len(privateKeys) < batchSize {
 		priv, err := crypto.GenerateKey()
@@ -90,7 +118,7 @@ func testBatchSender(t *testing.T, batchSize int) {
 			for i := 0; i < TXBatch; i++ {
 				toAddr := common.HexToAddress("0x4592d8f8d7b001e72cb26a73e4fa1806a51ac79d")
 				id := strconv.Itoa(i + index*1000)
-				_, err := newSender.SendTransaction(id, &toAddr, big.NewInt(1), nil)
+				_, err := newSender.SendTransaction(id, &toAddr, big.NewInt(1), nil, 0)
 				if errors.Is(err, sender.ErrNoAvailableAccount) {
 					<-time.After(time.Second)
 					continue

build/post-test-report-coverage.sh

@@ -4,11 +4,11 @@ ${GOROOT}/bin/bin/gocover-cobertura < coverage.bridge.txt > coverage.bridge.xml
 ${GOROOT}/bin/bin/gocover-cobertura < coverage.db.txt > coverage.db.xml
 ${GOROOT}/bin/bin/gocover-cobertura < coverage.common.txt > coverage.common.xml
 ${GOROOT}/bin/bin/gocover-cobertura < coverage.coordinator.txt > coverage.coordinator.xml
-${GOROOT}/bin/bin/gocover-cobertura < coverage.integration.txt > coverage.integration.xml
+# ${GOROOT}/bin/bin/gocover-cobertura < coverage.integration.txt > coverage.integration.xml
 
 npx cobertura-merge -o cobertura.xml \
     package1=coverage.bridge.xml \
     package2=coverage.db.xml \
     package3=coverage.common.xml \
-    package4=coverage.coordinator.xml \
-    package5=coverage.integration.xml
+    package4=coverage.coordinator.xml
+    # package5=coverage.integration.xml

common/cmd/cmd_app.go

@@ -46,7 +46,10 @@ func (c *Cmd) WaitExit() {
 	// Send interrupt signal.
 	c.mu.Lock()
 	_ = c.cmd.Process.Signal(os.Interrupt)
-	_, _ = c.cmd.Process.Wait()
+	// should use `_ = c.cmd.Process.Wait()` here, but we have some bugs in coordinator's graceful exit,
+	// so we use `Kill` as a temp workaround. And since `WaitExit` is only used in integration tests, so
+	// it won't really affect our functionalities.
+	_ = c.cmd.Process.Kill()
 	c.mu.Unlock()
 }
 

common/docker/docker_app.go

@@ -184,7 +184,7 @@ func newTestL1Docker(t *testing.T) ImgInstance {
 	assert.NoError(t, imgL1geth.Start())
 
 	// try 3 times to get chainID until is ok.
-	utils.TryTimes(3, func() bool {
+	utils.TryTimes(10, func() bool {
 		client, _ := ethclient.Dial(imgL1geth.Endpoint())
 		if client != nil {
 			if _, err := client.ChainID(context.Background()); err == nil {
@@ -203,7 +203,7 @@ func newTestL2Docker(t *testing.T) ImgInstance {
 	assert.NoError(t, imgL2geth.Start())
 
 	// try 3 times to get chainID until is ok.
-	utils.TryTimes(3, func() bool {
+	utils.TryTimes(10, func() bool {
 		client, _ := ethclient.Dial(imgL2geth.Endpoint())
 		if client != nil {
 			if _, err := client.ChainID(context.Background()); err == nil {
@@ -222,7 +222,7 @@ func newTestDBDocker(t *testing.T, driverName string) ImgInstance {
 	assert.NoError(t, imgDB.Start())
 
 	// try 5 times until the db is ready.
-	utils.TryTimes(5, func() bool {
+	utils.TryTimes(10, func() bool {
 		db, _ := sqlx.Open(driverName, imgDB.Endpoint())
 		if db != nil {
 			return db.Ping() == nil

common/docker/docker_db.go

@@ -45,7 +45,6 @@ func (i *ImgDB) Start() error {
 	if id != "" {
 		return fmt.Errorf("container already exist, name: %s", i.name)
 	}
-	i.cmd.RunCmd(true)
 	i.running = i.isOk()
 	if !i.running {
 		_ = i.Stop()
@@ -106,10 +105,12 @@ func (i *ImgDB) isOk() bool {
 		}
 	})
 	defer i.cmd.UnRegistFunc(keyword)
+	// Start cmd in parallel.
+	i.cmd.RunCmd(true)
 
 	select {
 	case <-okCh:
-		utils.TryTimes(3, func() bool {
+		utils.TryTimes(20, func() bool {
 			i.id = GetContainerID(i.name)
 			return i.id != ""
 		})

common/docker/docker_geth.go

@@ -48,7 +48,6 @@ func (i *ImgGeth) Start() error {
 	if id != "" {
 		return fmt.Errorf("container already exist, name: %s", i.name)
 	}
-	i.cmd.RunCmd(true)
 	i.running = i.isOk()
 	if !i.running {
 		_ = i.Stop()
@@ -85,10 +84,12 @@ func (i *ImgGeth) isOk() bool {
 		}
 	})
 	defer i.cmd.UnRegistFunc(keyword)
+	// Start cmd in parallel.
+	i.cmd.RunCmd(true)
 
 	select {
 	case <-okCh:
-		utils.TryTimes(3, func() bool {
+		utils.TryTimes(20, func() bool {
 			i.id = GetContainerID(i.name)
 			return i.id != ""
 		})

common/go.mod

@@ -8,9 +8,9 @@ require (
 	github.com/lib/pq v1.10.6
 	github.com/mattn/go-colorable v0.1.13
 	github.com/mattn/go-isatty v0.0.16
-	github.com/modern-go/reflect2 v1.0.1
+	github.com/modern-go/reflect2 v1.0.2
 	github.com/orcaman/concurrent-map v1.0.0
-	github.com/scroll-tech/go-ethereum v1.10.14-0.20230306131930-03b4de32b78b
+	github.com/scroll-tech/go-ethereum v1.10.14-0.20230321020420-127af384ed04
 	github.com/stretchr/testify v1.8.2
 	github.com/urfave/cli/v2 v2.17.2-0.20221006022127-8f469abc00aa
 	gotest.tools v2.2.0+incompatible
@@ -56,7 +56,6 @@ require (
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
 	github.com/mitchellh/pointerstructure v1.2.0 // indirect
 	github.com/moby/term v0.0.0-20220808134915-39b0c02b01ae // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
@@ -69,7 +68,7 @@ require (
 	github.com/rjeczalik/notify v0.9.1 // indirect
 	github.com/rs/cors v1.7.0 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
-	github.com/scroll-tech/zktrie v0.5.0 // indirect
+	github.com/scroll-tech/zktrie v0.5.2 // indirect
 	github.com/shirou/gopsutil v3.21.11+incompatible // indirect
 	github.com/sirupsen/logrus v1.9.0 // indirect
 	github.com/status-im/keycard-go v0.2.0 // indirect
@@ -87,6 +86,7 @@ require (
 	golang.org/x/text v0.8.0 // indirect
 	golang.org/x/time v0.0.0-20220922220347-f3bd1da661af // indirect
 	golang.org/x/tools v0.6.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 	gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce // indirect
 	gopkg.in/urfave/cli.v1 v1.20.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect

common/go.sum

@@ -234,6 +234,7 @@ github.com/klauspost/pgzip v1.0.2-0.20170402124221-0bf5dcad4ada/go.mod h1:Ch1tH6
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
@@ -276,10 +277,10 @@ github.com/mitchellh/pointerstructure v1.2.0 h1:O+i9nHnXS3l/9Wu7r4NrEdwA2VFTicjU
 github.com/mitchellh/pointerstructure v1.2.0/go.mod h1:BRAsLI5zgXmw97Lf6s25bs8ohIXc3tViBH44KcwB2g4=
 github.com/moby/term v0.0.0-20220808134915-39b0c02b01ae h1:O4SWKdcHVCvYqyDV+9CJA1fcDN2L11Bule0iFy3YlAI=
 github.com/moby/term v0.0.0-20220808134915-39b0c02b01ae/go.mod h1:E2VnQOmVuvZB6UYnnDB0qG5Nq/1tD9acaOpo6xmt0Kw=
-github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
-github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
+github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
+github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjYzDa0/r8luk=
 github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A=
 github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc=
 github.com/mschoch/smat v0.0.0-20160514031455-90eadee771ae/go.mod h1:qAyveg+e4CE+eKJXWVjKXM4ck2QobLqTDytGJbLLhJg=
@@ -342,10 +343,10 @@ github.com/rs/cors v1.7.0 h1:+88SsELBHx5r+hZ8TCkggzSstaWNbDvThkVK8H6f9ik=
 github.com/rs/cors v1.7.0/go.mod h1:gFx+x8UowdsKA9AchylcLynDq+nNFfI8FkUZdN/jGCU=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/scroll-tech/go-ethereum v1.10.14-0.20230306131930-03b4de32b78b h1:shNTzAnD2oDcDCrM4aaVCTzQNVfYxF1An08R2H2DLAg=
-github.com/scroll-tech/go-ethereum v1.10.14-0.20230306131930-03b4de32b78b/go.mod h1:f9ygxrxL7WRCTzuloV+t/UlcxMq3AL+gcNU60liiNNU=
-github.com/scroll-tech/zktrie v0.5.0 h1:dABDR6lMZq6Hs+fWQSiHbX8s3AOX6hY+5nkhSYm5rmU=
-github.com/scroll-tech/zktrie v0.5.0/go.mod h1:XvNo7vAk8yxNyTjBDj5WIiFzYW4bx/gJ78+NK6Zn6Uk=
+github.com/scroll-tech/go-ethereum v1.10.14-0.20230321020420-127af384ed04 h1:PpI31kaBVm6+7sZtyK03Ex0QIg3P821Ktae0FHFh7IM=
+github.com/scroll-tech/go-ethereum v1.10.14-0.20230321020420-127af384ed04/go.mod h1:jH8c08L9K8Hieaf0r/ur2P/cpesn4dFhmLm2Mmoi8kI=
+github.com/scroll-tech/zktrie v0.5.2 h1:U34jPXMLGOlRHfdvYp5VVgOcC0RuPeJmcS3bWotCWiY=
+github.com/scroll-tech/zktrie v0.5.2/go.mod h1:XvNo7vAk8yxNyTjBDj5WIiFzYW4bx/gJ78+NK6Zn6Uk=
 github.com/segmentio/kafka-go v0.1.0/go.mod h1:X6itGqS9L4jDletMsxZ7Dz+JFWxM6JHfPOCvTvk+EJo=
 github.com/segmentio/kafka-go v0.2.0/go.mod h1:X6itGqS9L4jDletMsxZ7Dz+JFWxM6JHfPOCvTvk+EJo=
 github.com/sergi/go-diff v1.0.0/go.mod h1:0CfEIISq7TuYL3j771MWULgwwjU+GofnZX9QAmXWZgo=
@@ -620,8 +621,9 @@ google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzi
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/natefinch/npipe.v2 v2.0.0-20160621034901-c1b8fa8bdcce h1:+JknDZhAj8YMt7GC73Ei8pv4MzjDUNPHgQWJdtMAaDU=

common/utils/workerpool/workerpool.go

@@ -0,0 +1,51 @@
+package workerpool
+
+import (
+	"sync"
+)
+
+// WorkerPool is responsible for creating workers and managing verify proof task between them
+type WorkerPool struct {
+	maxWorker     int
+	taskQueueChan chan func()
+	wg            sync.WaitGroup
+}
+
+// NewWorkerPool creates new worker pool with given amount of workers
+func NewWorkerPool(maxWorker int) *WorkerPool {
+	return &WorkerPool{
+		maxWorker:     maxWorker,
+		taskQueueChan: nil,
+		wg:            sync.WaitGroup{},
+	}
+}
+
+// Run runs WorkerPool
+func (vwp *WorkerPool) Run() {
+	vwp.taskQueueChan = make(chan func())
+	for i := 0; i < vwp.maxWorker; i++ {
+		go func() {
+			for task := range vwp.taskQueueChan {
+				if task != nil {
+					task()
+					vwp.wg.Done()
+				} else {
+					return
+				}
+			}
+		}()
+	}
+}
+
+// Stop stop WorkerPool
+func (vwp *WorkerPool) Stop() {
+	vwp.wg.Wait()
+	// close task queue channel, so that all goruotines listening from it stop
+	close(vwp.taskQueueChan)
+}
+
+// AddTask adds a task to WorkerPool
+func (vwp *WorkerPool) AddTask(task func()) {
+	vwp.wg.Add(1)
+	vwp.taskQueueChan <- task
+}

common/utils/workerpool/workerpool_test.go

@@ -0,0 +1,57 @@
+package workerpool_test
+
+import (
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"scroll-tech/common/utils/workerpool"
+)
+
+func TestWorkerPool(t *testing.T) {
+	as := assert.New(t)
+
+	vwp := workerpool.NewWorkerPool(2)
+	vwp.Run()
+	var cnt int32 = 3
+
+	task := func() {
+		time.Sleep(500 * time.Millisecond)
+		atomic.AddInt32(&cnt, -1)
+	}
+
+	go vwp.AddTask(task)
+	go vwp.AddTask(task)
+	go vwp.AddTask(task)
+
+	time.Sleep(600 * time.Millisecond)
+	as.Equal(int32(1), atomic.LoadInt32(&cnt))
+	vwp.Stop()
+	as.Equal(int32(0), atomic.LoadInt32(&cnt))
+
+}
+
+func TestWorkerPoolStopAndStart(t *testing.T) {
+	as := assert.New(t)
+	vwp := workerpool.NewWorkerPool(1)
+	var cnt int32 = 3
+
+	task := func() {
+		time.Sleep(500 * time.Millisecond)
+		atomic.AddInt32(&cnt, -1)
+	}
+
+	vwp.Run()
+	vwp.AddTask(task)
+	vwp.AddTask(task)
+	vwp.Stop()
+	as.Equal(int32(1), atomic.LoadInt32(&cnt))
+
+	vwp.Run()
+	vwp.AddTask(task)
+	vwp.Stop()
+	as.Equal(int32(0), atomic.LoadInt32(&cnt))
+
+}

common/version/version.go

@@ -5,7 +5,7 @@ import (
 	"runtime/debug"
 )
 
-var tag = "alpha-v2.0"
+var tag = "alpha-v2.5"
 
 var commit = func() string {
 	if info, ok := debug.ReadBuildInfo(); ok {

contracts/.prettierignore

@@ -3,3 +3,6 @@ artifacts
 cache
 coverage*
 gasReporterOutput.json
+src/libraries/verifier/ZkTrieVerifier.sol
+src/libraries/verifier/PatriciaMerkleTrieVerifier.sol
+src/L2/predeploys/L1BlockContainer.sol

contracts/.prettierrc

@@ -2,5 +2,17 @@
   "printWidth": 120,
   "singleQuote": false,
   "tabWidth": 2,
-  "bracketSpacing": true
+  "bracketSpacing": true,
+  "overrides": [
+    {
+      "files": "src/**/*.sol",
+      "options": {
+        "printWidth": 120,
+        "tabWidth": 4,
+        "useTabs": false,
+        "singleQuote": false,
+        "bracketSpacing": false
+      }
+    }
+  ]
 }

contracts/docs/apis/L1ScrollMessenger.md

@@ -163,17 +163,6 @@ function owner() external view returns (address)
 |---|---|---|
 | _0 | address | undefined |
 
-### pause
-
-```solidity
-function pause() external nonpayable
-```
-
-Pause the contract
-
-*This function can only called by contract owner.*
-
-
 ### paused
 
 ```solidity
@@ -264,6 +253,26 @@ The address of Rollup contract.
 
 ### sendMessage
 
+```solidity
+function sendMessage(address _to, uint256 _value, bytes _message, uint256 _gasLimit, address _refundAddress) external payable
+```
+
+Send cross chain message from L1 to L2 or L2 to L1.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| _to | address | undefined |
+| _value | uint256 | undefined |
+| _message | bytes | undefined |
+| _gasLimit | uint256 | undefined |
+| _refundAddress | address | undefined |
+
+### sendMessage
+
 ```solidity
 function sendMessage(address _to, uint256 _value, bytes _message, uint256 _gasLimit) external payable
 ```
@@ -281,6 +290,22 @@ Send cross chain message from L1 to L2 or L2 to L1.
 | _message | bytes | undefined |
 | _gasLimit | uint256 | undefined |
 
+### setPause
+
+```solidity
+function setPause(bool _status) external nonpayable
+```
+
+Pause the contract
+
+*This function can only called by contract owner.*
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| _status | bool | The pause status to update. |
+
 ### transferOwnership
 
 ```solidity

contracts/docs/apis/L2ScrollMessenger.md

@@ -212,17 +212,6 @@ function owner() external view returns (address)
 |---|---|---|
 | _0 | address | undefined |
 
-### pause
-
-```solidity
-function pause() external nonpayable
-```
-
-Pause the contract
-
-*This function can only called by contract owner.*
-
-
 ### paused
 
 ```solidity
@@ -294,6 +283,26 @@ function retryMessageWithProof(address _from, address _to, uint256 _value, uint2
 
 ### sendMessage
 
+```solidity
+function sendMessage(address _to, uint256 _value, bytes _message, uint256 _gasLimit, address _refundAddress) external payable
+```
+
+Send cross chain message from L1 to L2 or L2 to L1.
+
+
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| _to | address | undefined |
+| _value | uint256 | undefined |
+| _message | bytes | undefined |
+| _gasLimit | uint256 | undefined |
+| _refundAddress | address | undefined |
+
+### sendMessage
+
 ```solidity
 function sendMessage(address _to, uint256 _value, bytes _message, uint256 _gasLimit) external payable
 ```
@@ -311,6 +320,22 @@ Send cross chain message from L1 to L2 or L2 to L1.
 | _message | bytes | undefined |
 | _gasLimit | uint256 | undefined |
 
+### setPause
+
+```solidity
+function setPause(bool _status) external nonpayable
+```
+
+Pause the contract
+
+*This function can only called by contract owner.*
+
+#### Parameters
+
+| Name | Type | Description |
+|---|---|---|
+| _status | bool | The pause status to update. |
+
 ### transferOwnership
 
 ```solidity

contracts/src/External.sol

@@ -2,5 +2,5 @@
 
 pragma solidity ^0.8.0;
 
-import { ProxyAdmin } from "@openzeppelin/contracts/proxy/transparent/ProxyAdmin.sol";
-import { TransparentUpgradeableProxy } from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";
+import {ProxyAdmin} from "@openzeppelin/contracts/proxy/transparent/ProxyAdmin.sol";
+import {TransparentUpgradeableProxy} from "@openzeppelin/contracts/proxy/transparent/TransparentUpgradeableProxy.sol";

contracts/src/L1/IL1ScrollMessenger.sol

@@ -2,55 +2,55 @@
 
 pragma solidity ^0.8.0;
 
-import { IScrollMessenger } from "../libraries/IScrollMessenger.sol";
+import {IScrollMessenger} from "../libraries/IScrollMessenger.sol";
 
 interface IL1ScrollMessenger is IScrollMessenger {
-  /***********
-   * Structs *
-   ***********/
+    /***********
+     * Structs *
+     ***********/
 
-  struct L2MessageProof {
-    // The hash of the batch where the message belongs to.
-    bytes32 batchHash;
-    // Concatenation of merkle proof for withdraw merkle trie.
-    bytes merkleProof;
-  }
+    struct L2MessageProof {
+        // The hash of the batch where the message belongs to.
+        bytes32 batchHash;
+        // Concatenation of merkle proof for withdraw merkle trie.
+        bytes merkleProof;
+    }
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Relay a L2 => L1 message with message proof.
-  /// @param from The address of the sender of the message.
-  /// @param to The address of the recipient of the message.
-  /// @param value The msg.value passed to the message call.
-  /// @param nonce The nonce of the message to avoid replay attack.
-  /// @param message The content of the message.
-  /// @param proof The proof used to verify the correctness of the transaction.
-  function relayMessageWithProof(
-    address from,
-    address to,
-    uint256 value,
-    uint256 nonce,
-    bytes memory message,
-    L2MessageProof memory proof
-  ) external;
+    /// @notice Relay a L2 => L1 message with message proof.
+    /// @param from The address of the sender of the message.
+    /// @param to The address of the recipient of the message.
+    /// @param value The msg.value passed to the message call.
+    /// @param nonce The nonce of the message to avoid replay attack.
+    /// @param message The content of the message.
+    /// @param proof The proof used to verify the correctness of the transaction.
+    function relayMessageWithProof(
+        address from,
+        address to,
+        uint256 value,
+        uint256 nonce,
+        bytes memory message,
+        L2MessageProof memory proof
+    ) external;
 
-  /// @notice Replay an exsisting message.
-  /// @param from The address of the sender of the message.
-  /// @param to The address of the recipient of the message.
-  /// @param value The msg.value passed to the message call.
-  /// @param queueIndex The queue index for the message to replay.
-  /// @param message The content of the message.
-  /// @param oldGasLimit Original gas limit used to send the message.
-  /// @param newGasLimit New gas limit to be used for this message.
-  function replayMessage(
-    address from,
-    address to,
-    uint256 value,
-    uint256 queueIndex,
-    bytes memory message,
-    uint32 oldGasLimit,
-    uint32 newGasLimit
-  ) external;
+    /// @notice Replay an exsisting message.
+    /// @param from The address of the sender of the message.
+    /// @param to The address of the recipient of the message.
+    /// @param value The msg.value passed to the message call.
+    /// @param queueIndex The queue index for the message to replay.
+    /// @param message The content of the message.
+    /// @param oldGasLimit Original gas limit used to send the message.
+    /// @param newGasLimit New gas limit to be used for this message.
+    function replayMessage(
+        address from,
+        address to,
+        uint256 value,
+        uint256 queueIndex,
+        bytes memory message,
+        uint32 oldGasLimit,
+        uint32 newGasLimit
+    ) external;
 }

contracts/src/L1/L1ScrollMessenger.sol

@@ -2,15 +2,15 @@
 
 pragma solidity ^0.8.0;
 
-import { PausableUpgradeable } from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
+import {PausableUpgradeable} from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
 
-import { IScrollChain } from "./rollup/IScrollChain.sol";
-import { IL1MessageQueue } from "./rollup/IL1MessageQueue.sol";
-import { IL1ScrollMessenger } from "./IL1ScrollMessenger.sol";
-import { ScrollConstants } from "../libraries/constants/ScrollConstants.sol";
-import { IScrollMessenger } from "../libraries/IScrollMessenger.sol";
-import { ScrollMessengerBase } from "../libraries/ScrollMessengerBase.sol";
-import { WithdrawTrieVerifier } from "../libraries/verifier/WithdrawTrieVerifier.sol";
+import {IScrollChain} from "./rollup/IScrollChain.sol";
+import {IL1MessageQueue} from "./rollup/IL1MessageQueue.sol";
+import {IL1ScrollMessenger} from "./IL1ScrollMessenger.sol";
+import {ScrollConstants} from "../libraries/constants/ScrollConstants.sol";
+import {IScrollMessenger} from "../libraries/IScrollMessenger.sol";
+import {ScrollMessengerBase} from "../libraries/ScrollMessengerBase.sol";
+import {WithdrawTrieVerifier} from "../libraries/verifier/WithdrawTrieVerifier.sol";
 
 // solhint-disable avoid-low-level-calls
 
@@ -25,178 +25,228 @@ import { WithdrawTrieVerifier } from "../libraries/verifier/WithdrawTrieVerifier
 /// @dev All deposited Ether (including `WETH` deposited throng `L1WETHGateway`) will locked in
 /// this contract.
 contract L1ScrollMessenger is PausableUpgradeable, ScrollMessengerBase, IL1ScrollMessenger {
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from relay id to relay status.
-  mapping(bytes32 => bool) public isL1MessageRelayed;
+    /// @notice Mapping from relay id to relay status.
+    mapping(bytes32 => bool) public isL1MessageRelayed;
 
-  /// @notice Mapping from L1 message hash to sent status.
-  mapping(bytes32 => bool) public isL1MessageSent;
+    /// @notice Mapping from L1 message hash to sent status.
+    mapping(bytes32 => bool) public isL1MessageSent;
 
-  /// @notice Mapping from L2 message hash to a boolean value indicating if the message has been successfully executed.
-  mapping(bytes32 => bool) public isL2MessageExecuted;
+    /// @notice Mapping from L2 message hash to a boolean value indicating if the message has been successfully executed.
+    mapping(bytes32 => bool) public isL2MessageExecuted;
 
-  /// @notice The address of Rollup contract.
-  address public rollup;
+    /// @notice The address of Rollup contract.
+    address public rollup;
 
-  /// @notice The address of L1MessageQueue contract.
-  address public messageQueue;
+    /// @notice The address of L1MessageQueue contract.
+    address public messageQueue;
 
-  /***************
-   * Constructor *
-   ***************/
+    // @note move to ScrollMessengerBase in next big refactor
+    /// @dev The status of for non-reentrant check.
+    uint256 private _lock_status;
 
-  /// @notice Initialize the storage of L1ScrollMessenger.
-  /// @param _counterpart The address of L2ScrollMessenger contract in L2.
-  /// @param _feeVault The address of fee vault, which will be used to collect relayer fee.
-  /// @param _rollup The address of ScrollChain contract.
-  /// @param _messageQueue The address of L1MessageQueue contract.
-  function initialize(
-    address _counterpart,
-    address _feeVault,
-    address _rollup,
-    address _messageQueue
-  ) public initializer {
-    PausableUpgradeable.__Pausable_init();
-    ScrollMessengerBase._initialize(_counterpart, _feeVault);
+    /**********************
+     * Function Modifiers *
+     **********************/
 
-    rollup = _rollup;
-    messageQueue = _messageQueue;
+    modifier nonReentrant() {
+        // On the first call to nonReentrant, _notEntered will be true
+        require(_lock_status != _ENTERED, "ReentrancyGuard: reentrant call");
 
-    // initialize to a nonzero value
-    xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
-  }
+        // Any calls to nonReentrant after this point will fail
+        _lock_status = _ENTERED;
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+        _;
 
-  /// @inheritdoc IScrollMessenger
-  function sendMessage(
-    address _to,
-    uint256 _value,
-    bytes memory _message,
-    uint256 _gasLimit
-  ) external payable override whenNotPaused {
-    address _messageQueue = messageQueue; // gas saving
-    address _counterpart = counterpart; // gas saving
-
-    // compute the actual cross domain message calldata.
-    uint256 _messageNonce = IL1MessageQueue(_messageQueue).nextCrossDomainMessageIndex();
-    bytes memory _xDomainCalldata = _encodeXDomainCalldata(msg.sender, _to, _value, _messageNonce, _message);
-
-    // compute and deduct the messaging fee to fee vault.
-    uint256 _fee = IL1MessageQueue(_messageQueue).estimateCrossDomainMessageFee(
-      address(this),
-      _counterpart,
-      _xDomainCalldata,
-      _gasLimit
-    );
-    require(msg.value >= _fee + _value, "Insufficient msg.value");
-    if (_fee > 0) {
-      (bool _success, ) = feeVault.call{ value: _fee }("");
-      require(_success, "Failed to deduct the fee");
+        // By storing the original value once again, a refund is triggered (see
+        // https://eips.ethereum.org/EIPS/eip-2200)
+        _lock_status = _NOT_ENTERED;
     }
 
-    // append message to L1MessageQueue
-    IL1MessageQueue(_messageQueue).appendCrossDomainMessage(_counterpart, _gasLimit, _xDomainCalldata);
+    /***************
+     * Constructor *
+     ***************/
 
-    // record the message hash for future use.
-    bytes32 _xDomainCalldataHash = keccak256(_xDomainCalldata);
+    /// @notice Initialize the storage of L1ScrollMessenger.
+    /// @param _counterpart The address of L2ScrollMessenger contract in L2.
+    /// @param _feeVault The address of fee vault, which will be used to collect relayer fee.
+    /// @param _rollup The address of ScrollChain contract.
+    /// @param _messageQueue The address of L1MessageQueue contract.
+    function initialize(
+        address _counterpart,
+        address _feeVault,
+        address _rollup,
+        address _messageQueue
+    ) public initializer {
+        PausableUpgradeable.__Pausable_init();
+        ScrollMessengerBase._initialize(_counterpart, _feeVault);
 
-    // normally this won't happen, since each message has different nonce, but just in case.
-    require(!isL1MessageSent[_xDomainCalldataHash], "Duplicated message");
-    isL1MessageSent[_xDomainCalldataHash] = true;
+        rollup = _rollup;
+        messageQueue = _messageQueue;
 
-    emit SentMessage(msg.sender, _to, _value, _messageNonce, _gasLimit, _message);
-
-    // refund fee to tx.origin
-    unchecked {
-      uint256 _refund = msg.value - _fee - _value;
-      if (_refund > 0) {
-        (bool _success, ) = tx.origin.call{ value: _refund }("");
-        require(_success, "Failed to refund the fee");
-      }
+        // initialize to a nonzero value
+        xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
     }
-  }
 
-  /// @inheritdoc IL1ScrollMessenger
-  function relayMessageWithProof(
-    address _from,
-    address _to,
-    uint256 _value,
-    uint256 _nonce,
-    bytes memory _message,
-    L2MessageProof memory _proof
-  ) external override whenNotPaused onlyWhitelistedSender(msg.sender) {
-    require(xDomainMessageSender == ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER, "Message is already in execution");
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-    bytes32 _xDomainCalldataHash = keccak256(_encodeXDomainCalldata(_from, _to, _value, _nonce, _message));
-    require(!isL2MessageExecuted[_xDomainCalldataHash], "Message was already successfully executed");
+    /// @inheritdoc IScrollMessenger
+    function sendMessage(
+        address _to,
+        uint256 _value,
+        bytes memory _message,
+        uint256 _gasLimit
+    ) external payable override whenNotPaused {
+        _sendMessage(_to, _value, _message, _gasLimit, tx.origin);
+    }
 
-    {
-      address _rollup = rollup;
-      require(IScrollChain(_rollup).isBatchFinalized(_proof.batchHash), "Batch is not finalized");
-      // @note skip verify for now
-      /*
+    /// @inheritdoc IScrollMessenger
+    function sendMessage(
+        address _to,
+        uint256 _value,
+        bytes calldata _message,
+        uint256 _gasLimit,
+        address _refundAddress
+    ) external payable override whenNotPaused {
+        _sendMessage(_to, _value, _message, _gasLimit, _refundAddress);
+    }
+
+    /// @inheritdoc IL1ScrollMessenger
+    function relayMessageWithProof(
+        address _from,
+        address _to,
+        uint256 _value,
+        uint256 _nonce,
+        bytes memory _message,
+        L2MessageProof memory _proof
+    ) external override whenNotPaused onlyWhitelistedSender(msg.sender) {
+        require(
+            xDomainMessageSender == ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER,
+            "Message is already in execution"
+        );
+
+        bytes32 _xDomainCalldataHash = keccak256(_encodeXDomainCalldata(_from, _to, _value, _nonce, _message));
+        require(!isL2MessageExecuted[_xDomainCalldataHash], "Message was already successfully executed");
+
+        {
+            address _rollup = rollup;
+            require(IScrollChain(_rollup).isBatchFinalized(_proof.batchHash), "Batch is not finalized");
+            // @note skip verify for now
+            /*
       bytes32 _messageRoot = IScrollChain(_rollup).getL2MessageRoot(_proof.batchHash);
       require(
         WithdrawTrieVerifier.verifyMerkleProof(_messageRoot, _xDomainCalldataHash, _nonce, _proof.merkleProof),
         "Invalid proof"
       );
       */
+        }
+
+        // @todo check more `_to` address to avoid attack.
+        require(_to != messageQueue, "Forbid to call message queue");
+        require(_to != address(this), "Forbid to call self");
+
+        // @note This usually will never happen, just in case.
+        require(_from != xDomainMessageSender, "Invalid message sender");
+
+        xDomainMessageSender = _from;
+        (bool success, ) = _to.call{value: _value}(_message);
+        // reset value to refund gas.
+        xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
+
+        if (success) {
+            isL2MessageExecuted[_xDomainCalldataHash] = true;
+            emit RelayedMessage(_xDomainCalldataHash);
+        } else {
+            emit FailedRelayedMessage(_xDomainCalldataHash);
+        }
+
+        bytes32 _relayId = keccak256(abi.encodePacked(_xDomainCalldataHash, msg.sender, block.number));
+        isL1MessageRelayed[_relayId] = true;
     }
 
-    // @todo check more `_to` address to avoid attack.
-    require(_to != messageQueue, "Forbid to call message queue");
-    require(_to != address(this), "Forbid to call self");
-
-    // @note This usually will never happen, just in case.
-    require(_from != xDomainMessageSender, "Invalid message sender");
-
-    xDomainMessageSender = _from;
-    (bool success, ) = _to.call{ value: _value }(_message);
-    // reset value to refund gas.
-    xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
-
-    if (success) {
-      isL2MessageExecuted[_xDomainCalldataHash] = true;
-      emit RelayedMessage(_xDomainCalldataHash);
-    } else {
-      emit FailedRelayedMessage(_xDomainCalldataHash);
+    /// @inheritdoc IL1ScrollMessenger
+    function replayMessage(
+        address _from,
+        address _to,
+        uint256 _value,
+        uint256 _queueIndex,
+        bytes memory _message,
+        uint32 _oldGasLimit,
+        uint32 _newGasLimit
+    ) external override whenNotPaused {
+        // @todo
     }
 
-    bytes32 _relayId = keccak256(abi.encodePacked(_xDomainCalldataHash, msg.sender, block.number));
-    isL1MessageRelayed[_relayId] = true;
-  }
+    /************************
+     * Restricted Functions *
+     ************************/
 
-  /// @inheritdoc IL1ScrollMessenger
-  function replayMessage(
-    address _from,
-    address _to,
-    uint256 _value,
-    uint256 _queueIndex,
-    bytes memory _message,
-    uint32 _oldGasLimit,
-    uint32 _newGasLimit
-  ) external override whenNotPaused {
-    // @todo
-  }
-
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Pause the contract
-  /// @dev This function can only called by contract owner.
-  /// @param _status The pause status to update.
-  function setPause(bool _status) external onlyOwner {
-    if (_status) {
-      _pause();
-    } else {
-      _unpause();
+    /// @notice Pause the contract
+    /// @dev This function can only called by contract owner.
+    /// @param _status The pause status to update.
+    function setPause(bool _status) external onlyOwner {
+        if (_status) {
+            _pause();
+        } else {
+            _unpause();
+        }
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    function _sendMessage(
+        address _to,
+        uint256 _value,
+        bytes memory _message,
+        uint256 _gasLimit,
+        address _refundAddress
+    ) internal nonReentrant {
+        address _messageQueue = messageQueue; // gas saving
+        address _counterpart = counterpart; // gas saving
+
+        // compute the actual cross domain message calldata.
+        uint256 _messageNonce = IL1MessageQueue(_messageQueue).nextCrossDomainMessageIndex();
+        bytes memory _xDomainCalldata = _encodeXDomainCalldata(msg.sender, _to, _value, _messageNonce, _message);
+
+        // compute and deduct the messaging fee to fee vault.
+        uint256 _fee = IL1MessageQueue(_messageQueue).estimateCrossDomainMessageFee(
+            address(this),
+            _counterpart,
+            _xDomainCalldata,
+            _gasLimit
+        );
+        require(msg.value >= _fee + _value, "Insufficient msg.value");
+        if (_fee > 0) {
+            (bool _success, ) = feeVault.call{value: _fee}("");
+            require(_success, "Failed to deduct the fee");
+        }
+
+        // append message to L1MessageQueue
+        IL1MessageQueue(_messageQueue).appendCrossDomainMessage(_counterpart, _gasLimit, _xDomainCalldata);
+
+        // record the message hash for future use.
+        bytes32 _xDomainCalldataHash = keccak256(_xDomainCalldata);
+
+        // normally this won't happen, since each message has different nonce, but just in case.
+        require(!isL1MessageSent[_xDomainCalldataHash], "Duplicated message");
+        isL1MessageSent[_xDomainCalldataHash] = true;
+
+        emit SentMessage(msg.sender, _to, _value, _messageNonce, _gasLimit, _message);
+
+        // refund fee to tx.origin
+        unchecked {
+            uint256 _refund = msg.value - _fee - _value;
+            if (_refund > 0) {
+                (bool _success, ) = _refundAddress.call{value: _refund}("");
+                require(_success, "Failed to refund the fee");
+            }
+        }
     }
-  }
 }

contracts/src/L1/gateways/IL1ERC1155Gateway.sol

@@ -4,163 +4,163 @@ pragma solidity ^0.8.0;
 
 /// @title The interface for the ERC1155 cross chain gateway in layer 1.
 interface IL1ERC1155Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when the ERC1155 NFT is transfered to recipient in layer 1.
-  /// @param _l1Token The address of ERC1155 NFT in layer 1.
-  /// @param _l2Token The address of ERC1155 NFT in layer 2.
-  /// @param _from The address of sender in layer 2.
-  /// @param _to The address of recipient in layer 1.
-  /// @param _tokenId The token id of the ERC1155 NFT to withdraw from layer 2.
-  /// @param _amount The number of token to withdraw from layer 2.
-  event FinalizeWithdrawERC1155(
-    address indexed _l1Token,
-    address indexed _l2Token,
-    address indexed _from,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount
-  );
+    /// @notice Emitted when the ERC1155 NFT is transfered to recipient in layer 1.
+    /// @param _l1Token The address of ERC1155 NFT in layer 1.
+    /// @param _l2Token The address of ERC1155 NFT in layer 2.
+    /// @param _from The address of sender in layer 2.
+    /// @param _to The address of recipient in layer 1.
+    /// @param _tokenId The token id of the ERC1155 NFT to withdraw from layer 2.
+    /// @param _amount The number of token to withdraw from layer 2.
+    event FinalizeWithdrawERC1155(
+        address indexed _l1Token,
+        address indexed _l2Token,
+        address indexed _from,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount
+    );
 
-  /// @notice Emitted when the ERC1155 NFT is batch transfered to recipient in layer 1.
-  /// @param _l1Token The address of ERC1155 NFT in layer 1.
-  /// @param _l2Token The address of ERC1155 NFT in layer 2.
-  /// @param _from The address of sender in layer 2.
-  /// @param _to The address of recipient in layer 1.
-  /// @param _tokenIds The list of token ids of the ERC1155 NFT to withdraw from layer 2.
-  /// @param _amounts The list of corresponding number of token to withdraw from layer 2.
-  event FinalizeBatchWithdrawERC1155(
-    address indexed _l1Token,
-    address indexed _l2Token,
-    address indexed _from,
-    address _to,
-    uint256[] _tokenIds,
-    uint256[] _amounts
-  );
+    /// @notice Emitted when the ERC1155 NFT is batch transfered to recipient in layer 1.
+    /// @param _l1Token The address of ERC1155 NFT in layer 1.
+    /// @param _l2Token The address of ERC1155 NFT in layer 2.
+    /// @param _from The address of sender in layer 2.
+    /// @param _to The address of recipient in layer 1.
+    /// @param _tokenIds The list of token ids of the ERC1155 NFT to withdraw from layer 2.
+    /// @param _amounts The list of corresponding number of token to withdraw from layer 2.
+    event FinalizeBatchWithdrawERC1155(
+        address indexed _l1Token,
+        address indexed _l2Token,
+        address indexed _from,
+        address _to,
+        uint256[] _tokenIds,
+        uint256[] _amounts
+    );
 
-  /// @notice Emitted when the ERC1155 NFT is deposited to gateway in layer 1.
-  /// @param _l1Token The address of ERC1155 NFT in layer 1.
-  /// @param _l2Token The address of ERC1155 NFT in layer 2.
-  /// @param _from The address of sender in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenId The token id of the ERC1155 NFT to deposit in layer 1.
-  /// @param _amount The number of token to deposit in layer 1.
-  event DepositERC1155(
-    address indexed _l1Token,
-    address indexed _l2Token,
-    address indexed _from,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount
-  );
+    /// @notice Emitted when the ERC1155 NFT is deposited to gateway in layer 1.
+    /// @param _l1Token The address of ERC1155 NFT in layer 1.
+    /// @param _l2Token The address of ERC1155 NFT in layer 2.
+    /// @param _from The address of sender in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenId The token id of the ERC1155 NFT to deposit in layer 1.
+    /// @param _amount The number of token to deposit in layer 1.
+    event DepositERC1155(
+        address indexed _l1Token,
+        address indexed _l2Token,
+        address indexed _from,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount
+    );
 
-  /// @notice Emitted when the ERC1155 NFT is batch deposited to gateway in layer 1.
-  /// @param _l1Token The address of ERC1155 NFT in layer 1.
-  /// @param _l2Token The address of ERC1155 NFT in layer 2.
-  /// @param _from The address of sender in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenIds The list of token ids of the ERC1155 NFT to deposit in layer 1.
-  /// @param _amounts The list of corresponding number of token to deposit in layer 1.
-  event BatchDepositERC1155(
-    address indexed _l1Token,
-    address indexed _l2Token,
-    address indexed _from,
-    address _to,
-    uint256[] _tokenIds,
-    uint256[] _amounts
-  );
+    /// @notice Emitted when the ERC1155 NFT is batch deposited to gateway in layer 1.
+    /// @param _l1Token The address of ERC1155 NFT in layer 1.
+    /// @param _l2Token The address of ERC1155 NFT in layer 2.
+    /// @param _from The address of sender in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenIds The list of token ids of the ERC1155 NFT to deposit in layer 1.
+    /// @param _amounts The list of corresponding number of token to deposit in layer 1.
+    event BatchDepositERC1155(
+        address indexed _l1Token,
+        address indexed _l2Token,
+        address indexed _from,
+        address _to,
+        uint256[] _tokenIds,
+        uint256[] _amounts
+    );
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Deposit some ERC1155 NFT to caller's account on layer 2.
-  /// @param _token The address of ERC1155 NFT in layer 1.
-  /// @param _tokenId The token id to deposit.
-  /// @param _amount The amount of token to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function depositERC1155(
-    address _token,
-    uint256 _tokenId,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit some ERC1155 NFT to caller's account on layer 2.
+    /// @param _token The address of ERC1155 NFT in layer 1.
+    /// @param _tokenId The token id to deposit.
+    /// @param _amount The amount of token to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function depositERC1155(
+        address _token,
+        uint256 _tokenId,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Deposit some ERC1155 NFT to a recipient's account on layer 2.
-  /// @param _token The address of ERC1155 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenId The token id to deposit.
-  /// @param _amount The amount of token to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function depositERC1155(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit some ERC1155 NFT to a recipient's account on layer 2.
+    /// @param _token The address of ERC1155 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenId The token id to deposit.
+    /// @param _amount The amount of token to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function depositERC1155(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Deposit a list of some ERC1155 NFT to caller's account on layer 2.
-  /// @param _token The address of ERC1155 NFT in layer 1.
-  /// @param _tokenIds The list of token ids to deposit.
-  /// @param _amounts The list of corresponding number of token to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function batchDepositERC1155(
-    address _token,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit a list of some ERC1155 NFT to caller's account on layer 2.
+    /// @param _token The address of ERC1155 NFT in layer 1.
+    /// @param _tokenIds The list of token ids to deposit.
+    /// @param _amounts The list of corresponding number of token to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function batchDepositERC1155(
+        address _token,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Deposit a list of some ERC1155 NFT to a recipient's account on layer 2.
-  /// @param _token The address of ERC1155 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenIds The list of token ids to deposit.
-  /// @param _amounts The list of corresponding number of token to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function batchDepositERC1155(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit a list of some ERC1155 NFT to a recipient's account on layer 2.
+    /// @param _token The address of ERC1155 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenIds The list of token ids to deposit.
+    /// @param _amounts The list of corresponding number of token to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function batchDepositERC1155(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Complete ERC1155 withdraw from layer 2 to layer 1 and send fund to recipient's account in layer 1.
-  ///      The function should only be called by L1ScrollMessenger.
-  ///      The function should also only be called by L2ERC1155Gateway in layer 2.
-  /// @param _l1Token The address of corresponding layer 1 token.
-  /// @param _l2Token The address of corresponding layer 2 token.
-  /// @param _from The address of account who withdraw the token in layer 2.
-  /// @param _to The address of recipient in layer 1 to receive the token.
-  /// @param _tokenId The token id to withdraw.
-  /// @param _amount The amount of token to withdraw.
-  function finalizeWithdrawERC1155(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount
-  ) external;
+    /// @notice Complete ERC1155 withdraw from layer 2 to layer 1 and send fund to recipient's account in layer 1.
+    ///      The function should only be called by L1ScrollMessenger.
+    ///      The function should also only be called by L2ERC1155Gateway in layer 2.
+    /// @param _l1Token The address of corresponding layer 1 token.
+    /// @param _l2Token The address of corresponding layer 2 token.
+    /// @param _from The address of account who withdraw the token in layer 2.
+    /// @param _to The address of recipient in layer 1 to receive the token.
+    /// @param _tokenId The token id to withdraw.
+    /// @param _amount The amount of token to withdraw.
+    function finalizeWithdrawERC1155(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount
+    ) external;
 
-  /// @notice Complete ERC1155 batch withdraw from layer 2 to layer 1 and send fund to recipient's account in layer 1.
-  ///      The function should only be called by L1ScrollMessenger.
-  ///      The function should also only be called by L2ERC1155Gateway in layer 2.
-  /// @param _l1Token The address of corresponding layer 1 token.
-  /// @param _l2Token The address of corresponding layer 2 token.
-  /// @param _from The address of account who withdraw the token in layer 2.
-  /// @param _to The address of recipient in layer 1 to receive the token.
-  /// @param _tokenIds The list of token ids to withdraw.
-  /// @param _amounts The list of corresponding number of token to withdraw.
-  function finalizeBatchWithdrawERC1155(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts
-  ) external;
+    /// @notice Complete ERC1155 batch withdraw from layer 2 to layer 1 and send fund to recipient's account in layer 1.
+    ///      The function should only be called by L1ScrollMessenger.
+    ///      The function should also only be called by L2ERC1155Gateway in layer 2.
+    /// @param _l1Token The address of corresponding layer 1 token.
+    /// @param _l2Token The address of corresponding layer 2 token.
+    /// @param _from The address of account who withdraw the token in layer 2.
+    /// @param _to The address of recipient in layer 1 to receive the token.
+    /// @param _tokenIds The list of token ids to withdraw.
+    /// @param _amounts The list of corresponding number of token to withdraw.
+    function finalizeBatchWithdrawERC1155(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts
+    ) external;
 }

contracts/src/L1/gateways/IL1ERC20Gateway.sol

@@ -3,109 +3,109 @@
 pragma solidity ^0.8.0;
 
 interface IL1ERC20Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when ERC20 token is withdrawn from L2 to L1 and transfer to recipient.
-  /// @param l1Token The address of the token in L1.
-  /// @param l2Token The address of the token in L2.
-  /// @param from The address of sender in L2.
-  /// @param to The address of recipient in L1.
-  /// @param amount The amount of token withdrawn from L2 to L1.
-  /// @param data The optional calldata passed to recipient in L1.
-  event FinalizeWithdrawERC20(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256 amount,
-    bytes data
-  );
+    /// @notice Emitted when ERC20 token is withdrawn from L2 to L1 and transfer to recipient.
+    /// @param l1Token The address of the token in L1.
+    /// @param l2Token The address of the token in L2.
+    /// @param from The address of sender in L2.
+    /// @param to The address of recipient in L1.
+    /// @param amount The amount of token withdrawn from L2 to L1.
+    /// @param data The optional calldata passed to recipient in L1.
+    event FinalizeWithdrawERC20(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256 amount,
+        bytes data
+    );
 
-  /// @notice Emitted when someone deposit ERC20 token from L1 to L2.
-  /// @param l1Token The address of the token in L1.
-  /// @param l2Token The address of the token in L2.
-  /// @param from The address of sender in L1.
-  /// @param to The address of recipient in L2.
-  /// @param amount The amount of token will be deposited from L1 to L2.
-  /// @param data The optional calldata passed to recipient in L2.
-  event DepositERC20(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256 amount,
-    bytes data
-  );
+    /// @notice Emitted when someone deposit ERC20 token from L1 to L2.
+    /// @param l1Token The address of the token in L1.
+    /// @param l2Token The address of the token in L2.
+    /// @param from The address of sender in L1.
+    /// @param to The address of recipient in L2.
+    /// @param amount The amount of token will be deposited from L1 to L2.
+    /// @param data The optional calldata passed to recipient in L2.
+    event DepositERC20(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256 amount,
+        bytes data
+    );
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Return the corresponding l2 token address given l1 token address.
-  /// @param _l1Token The address of l1 token.
-  function getL2ERC20Address(address _l1Token) external view returns (address);
+    /// @notice Return the corresponding l2 token address given l1 token address.
+    /// @param _l1Token The address of l1 token.
+    function getL2ERC20Address(address _l1Token) external view returns (address);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Deposit some token to a caller's account on L2.
-  /// @dev Make this function payable to send relayer fee in Ether.
-  /// @param _token The address of token in L1.
-  /// @param _amount The amount of token to transfer.
-  /// @param _gasLimit Gas limit required to complete the deposit on L2.
-  function depositERC20(
-    address _token,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit some token to a caller's account on L2.
+    /// @dev Make this function payable to send relayer fee in Ether.
+    /// @param _token The address of token in L1.
+    /// @param _amount The amount of token to transfer.
+    /// @param _gasLimit Gas limit required to complete the deposit on L2.
+    function depositERC20(
+        address _token,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Deposit some token to a recipient's account on L2.
-  /// @dev Make this function payable to send relayer fee in Ether.
-  /// @param _token The address of token in L1.
-  /// @param _to The address of recipient's account on L2.
-  /// @param _amount The amount of token to transfer.
-  /// @param _gasLimit Gas limit required to complete the deposit on L2.
-  function depositERC20(
-    address _token,
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit some token to a recipient's account on L2.
+    /// @dev Make this function payable to send relayer fee in Ether.
+    /// @param _token The address of token in L1.
+    /// @param _to The address of recipient's account on L2.
+    /// @param _amount The amount of token to transfer.
+    /// @param _gasLimit Gas limit required to complete the deposit on L2.
+    function depositERC20(
+        address _token,
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Deposit some token to a recipient's account on L2 and call.
-  /// @dev Make this function payable to send relayer fee in Ether.
-  /// @param _token The address of token in L1.
-  /// @param _to The address of recipient's account on L2.
-  /// @param _amount The amount of token to transfer.
-  /// @param _data Optional data to forward to recipient's account.
-  /// @param _gasLimit Gas limit required to complete the deposit on L2.
-  function depositERC20AndCall(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit some token to a recipient's account on L2 and call.
+    /// @dev Make this function payable to send relayer fee in Ether.
+    /// @param _token The address of token in L1.
+    /// @param _to The address of recipient's account on L2.
+    /// @param _amount The amount of token to transfer.
+    /// @param _data Optional data to forward to recipient's account.
+    /// @param _gasLimit Gas limit required to complete the deposit on L2.
+    function depositERC20AndCall(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Complete ERC20 withdraw from L2 to L1 and send fund to recipient's account in L1.
-  /// @dev Make this function payable to handle WETH deposit/withdraw.
-  ///      The function should only be called by L1ScrollMessenger.
-  ///      The function should also only be called by L2ERC20Gateway in L2.
-  /// @param _l1Token The address of corresponding L1 token.
-  /// @param _l2Token The address of corresponding L2 token.
-  /// @param _from The address of account who withdraw the token in L2.
-  /// @param _to The address of recipient in L1 to receive the token.
-  /// @param _amount The amount of the token to withdraw.
-  /// @param _data Optional data to forward to recipient's account.
-  function finalizeWithdrawERC20(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable;
+    /// @notice Complete ERC20 withdraw from L2 to L1 and send fund to recipient's account in L1.
+    /// @dev Make this function payable to handle WETH deposit/withdraw.
+    ///      The function should only be called by L1ScrollMessenger.
+    ///      The function should also only be called by L2ERC20Gateway in L2.
+    /// @param _l1Token The address of corresponding L1 token.
+    /// @param _l2Token The address of corresponding L2 token.
+    /// @param _from The address of account who withdraw the token in L2.
+    /// @param _to The address of recipient in L1 to receive the token.
+    /// @param _amount The amount of the token to withdraw.
+    /// @param _data Optional data to forward to recipient's account.
+    function finalizeWithdrawERC20(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable;
 }

contracts/src/L1/gateways/IL1ERC721Gateway.sol

@@ -4,145 +4,145 @@ pragma solidity ^0.8.0;
 
 /// @title The interface for the ERC721 cross chain gateway in layer 1.
 interface IL1ERC721Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when the ERC721 NFT is transfered to recipient in layer 1.
-  /// @param _l1Token The address of ERC721 NFT in layer 1.
-  /// @param _l2Token The address of ERC721 NFT in layer 2.
-  /// @param _from The address of sender in layer 2.
-  /// @param _to The address of recipient in layer 1.
-  /// @param _tokenId The token id of the ERC721 NFT to withdraw from layer 2.
-  event FinalizeWithdrawERC721(
-    address indexed _l1Token,
-    address indexed _l2Token,
-    address indexed _from,
-    address _to,
-    uint256 _tokenId
-  );
+    /// @notice Emitted when the ERC721 NFT is transfered to recipient in layer 1.
+    /// @param _l1Token The address of ERC721 NFT in layer 1.
+    /// @param _l2Token The address of ERC721 NFT in layer 2.
+    /// @param _from The address of sender in layer 2.
+    /// @param _to The address of recipient in layer 1.
+    /// @param _tokenId The token id of the ERC721 NFT to withdraw from layer 2.
+    event FinalizeWithdrawERC721(
+        address indexed _l1Token,
+        address indexed _l2Token,
+        address indexed _from,
+        address _to,
+        uint256 _tokenId
+    );
 
-  /// @notice Emitted when the ERC721 NFT is batch transfered to recipient in layer 1.
-  /// @param _l1Token The address of ERC721 NFT in layer 1.
-  /// @param _l2Token The address of ERC721 NFT in layer 2.
-  /// @param _from The address of sender in layer 2.
-  /// @param _to The address of recipient in layer 1.
-  /// @param _tokenIds The list of token ids of the ERC721 NFT to withdraw from layer 2.
-  event FinalizeBatchWithdrawERC721(
-    address indexed _l1Token,
-    address indexed _l2Token,
-    address indexed _from,
-    address _to,
-    uint256[] _tokenIds
-  );
+    /// @notice Emitted when the ERC721 NFT is batch transfered to recipient in layer 1.
+    /// @param _l1Token The address of ERC721 NFT in layer 1.
+    /// @param _l2Token The address of ERC721 NFT in layer 2.
+    /// @param _from The address of sender in layer 2.
+    /// @param _to The address of recipient in layer 1.
+    /// @param _tokenIds The list of token ids of the ERC721 NFT to withdraw from layer 2.
+    event FinalizeBatchWithdrawERC721(
+        address indexed _l1Token,
+        address indexed _l2Token,
+        address indexed _from,
+        address _to,
+        uint256[] _tokenIds
+    );
 
-  /// @notice Emitted when the ERC721 NFT is deposited to gateway in layer 1.
-  /// @param _l1Token The address of ERC721 NFT in layer 1.
-  /// @param _l2Token The address of ERC721 NFT in layer 2.
-  /// @param _from The address of sender in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenId The token id of the ERC721 NFT to deposit in layer 1.
-  event DepositERC721(
-    address indexed _l1Token,
-    address indexed _l2Token,
-    address indexed _from,
-    address _to,
-    uint256 _tokenId
-  );
+    /// @notice Emitted when the ERC721 NFT is deposited to gateway in layer 1.
+    /// @param _l1Token The address of ERC721 NFT in layer 1.
+    /// @param _l2Token The address of ERC721 NFT in layer 2.
+    /// @param _from The address of sender in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenId The token id of the ERC721 NFT to deposit in layer 1.
+    event DepositERC721(
+        address indexed _l1Token,
+        address indexed _l2Token,
+        address indexed _from,
+        address _to,
+        uint256 _tokenId
+    );
 
-  /// @notice Emitted when the ERC721 NFT is batch deposited to gateway in layer 1.
-  /// @param _l1Token The address of ERC721 NFT in layer 1.
-  /// @param _l2Token The address of ERC721 NFT in layer 2.
-  /// @param _from The address of sender in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenIds The list of token ids of the ERC721 NFT to deposit in layer 1.
-  event BatchDepositERC721(
-    address indexed _l1Token,
-    address indexed _l2Token,
-    address indexed _from,
-    address _to,
-    uint256[] _tokenIds
-  );
+    /// @notice Emitted when the ERC721 NFT is batch deposited to gateway in layer 1.
+    /// @param _l1Token The address of ERC721 NFT in layer 1.
+    /// @param _l2Token The address of ERC721 NFT in layer 2.
+    /// @param _from The address of sender in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenIds The list of token ids of the ERC721 NFT to deposit in layer 1.
+    event BatchDepositERC721(
+        address indexed _l1Token,
+        address indexed _l2Token,
+        address indexed _from,
+        address _to,
+        uint256[] _tokenIds
+    );
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Deposit some ERC721 NFT to caller's account on layer 2.
-  /// @param _token The address of ERC721 NFT in layer 1.
-  /// @param _tokenId The token id to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function depositERC721(
-    address _token,
-    uint256 _tokenId,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit some ERC721 NFT to caller's account on layer 2.
+    /// @param _token The address of ERC721 NFT in layer 1.
+    /// @param _tokenId The token id to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function depositERC721(
+        address _token,
+        uint256 _tokenId,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Deposit some ERC721 NFT to a recipient's account on layer 2.
-  /// @param _token The address of ERC721 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenId The token id to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function depositERC721(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit some ERC721 NFT to a recipient's account on layer 2.
+    /// @param _token The address of ERC721 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenId The token id to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function depositERC721(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Deposit a list of some ERC721 NFT to caller's account on layer 2.
-  /// @param _token The address of ERC721 NFT in layer 1.
-  /// @param _tokenIds The list of token ids to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function batchDepositERC721(
-    address _token,
-    uint256[] calldata _tokenIds,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit a list of some ERC721 NFT to caller's account on layer 2.
+    /// @param _token The address of ERC721 NFT in layer 1.
+    /// @param _tokenIds The list of token ids to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function batchDepositERC721(
+        address _token,
+        uint256[] calldata _tokenIds,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Deposit a list of some ERC721 NFT to a recipient's account on layer 2.
-  /// @param _token The address of ERC721 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenIds The list of token ids to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function batchDepositERC721(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256 _gasLimit
-  ) external payable;
+    /// @notice Deposit a list of some ERC721 NFT to a recipient's account on layer 2.
+    /// @param _token The address of ERC721 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenIds The list of token ids to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function batchDepositERC721(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256 _gasLimit
+    ) external payable;
 
-  /// @notice Complete ERC721 withdraw from layer 2 to layer 1 and send NFT to recipient's account in layer 1.
-  /// @dev Requirements:
-  ///  - The function should only be called by L1ScrollMessenger.
-  ///  - The function should also only be called by L2ERC721Gateway in layer 2.
-  /// @param _l1Token The address of corresponding layer 1 token.
-  /// @param _l2Token The address of corresponding layer 2 token.
-  /// @param _from The address of account who withdraw the token in layer 2.
-  /// @param _to The address of recipient in layer 1 to receive the token.
-  /// @param _tokenId The token id to withdraw.
-  function finalizeWithdrawERC721(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _tokenId
-  ) external;
+    /// @notice Complete ERC721 withdraw from layer 2 to layer 1 and send NFT to recipient's account in layer 1.
+    /// @dev Requirements:
+    ///  - The function should only be called by L1ScrollMessenger.
+    ///  - The function should also only be called by L2ERC721Gateway in layer 2.
+    /// @param _l1Token The address of corresponding layer 1 token.
+    /// @param _l2Token The address of corresponding layer 2 token.
+    /// @param _from The address of account who withdraw the token in layer 2.
+    /// @param _to The address of recipient in layer 1 to receive the token.
+    /// @param _tokenId The token id to withdraw.
+    function finalizeWithdrawERC721(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _tokenId
+    ) external;
 
-  /// @notice Complete ERC721 batch withdraw from layer 2 to layer 1 and send NFT to recipient's account in layer 1.
-  /// @dev Requirements:
-  ///  - The function should only be called by L1ScrollMessenger.
-  ///  - The function should also only be called by L2ERC721Gateway in layer 2.
-  /// @param _l1Token The address of corresponding layer 1 token.
-  /// @param _l2Token The address of corresponding layer 2 token.
-  /// @param _from The address of account who withdraw the token in layer 2.
-  /// @param _to The address of recipient in layer 1 to receive the token.
-  /// @param _tokenIds The list of token ids to withdraw.
-  function finalizeBatchWithdrawERC721(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256[] calldata _tokenIds
-  ) external;
+    /// @notice Complete ERC721 batch withdraw from layer 2 to layer 1 and send NFT to recipient's account in layer 1.
+    /// @dev Requirements:
+    ///  - The function should only be called by L1ScrollMessenger.
+    ///  - The function should also only be called by L2ERC721Gateway in layer 2.
+    /// @param _l1Token The address of corresponding layer 1 token.
+    /// @param _l2Token The address of corresponding layer 2 token.
+    /// @param _from The address of account who withdraw the token in layer 2.
+    /// @param _to The address of recipient in layer 1 to receive the token.
+    /// @param _tokenIds The list of token ids to withdraw.
+    function finalizeBatchWithdrawERC721(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256[] calldata _tokenIds
+    ) external;
 }

contracts/src/L1/gateways/IL1ETHGateway.sol

@@ -3,66 +3,66 @@
 pragma solidity ^0.8.0;
 
 interface IL1ETHGateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when ETH is withdrawn from L2 to L1 and transfer to recipient.
-  /// @param from The address of sender in L2.
-  /// @param to The address of recipient in L1.
-  /// @param amount The amount of ETH withdrawn from L2 to L1.
-  /// @param data The optional calldata passed to recipient in L1.
-  event FinalizeWithdrawETH(address indexed from, address indexed to, uint256 amount, bytes data);
+    /// @notice Emitted when ETH is withdrawn from L2 to L1 and transfer to recipient.
+    /// @param from The address of sender in L2.
+    /// @param to The address of recipient in L1.
+    /// @param amount The amount of ETH withdrawn from L2 to L1.
+    /// @param data The optional calldata passed to recipient in L1.
+    event FinalizeWithdrawETH(address indexed from, address indexed to, uint256 amount, bytes data);
 
-  /// @notice Emitted when someone deposit ETH from L1 to L2.
-  /// @param from The address of sender in L1.
-  /// @param to The address of recipient in L2.
-  /// @param amount The amount of ETH will be deposited from L1 to L2.
-  /// @param data The optional calldata passed to recipient in L2.
-  event DepositETH(address indexed from, address indexed to, uint256 amount, bytes data);
+    /// @notice Emitted when someone deposit ETH from L1 to L2.
+    /// @param from The address of sender in L1.
+    /// @param to The address of recipient in L2.
+    /// @param amount The amount of ETH will be deposited from L1 to L2.
+    /// @param data The optional calldata passed to recipient in L2.
+    event DepositETH(address indexed from, address indexed to, uint256 amount, bytes data);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Deposit ETH to caller's account in L2.
-  /// @param amount The amount of ETH to be deposited.
-  /// @param gasLimit Gas limit required to complete the deposit on L2.
-  function depositETH(uint256 amount, uint256 gasLimit) external payable;
+    /// @notice Deposit ETH to caller's account in L2.
+    /// @param amount The amount of ETH to be deposited.
+    /// @param gasLimit Gas limit required to complete the deposit on L2.
+    function depositETH(uint256 amount, uint256 gasLimit) external payable;
 
-  /// @notice Deposit ETH to some recipient's account in L2.
-  /// @param to The address of recipient's account on L2.
-  /// @param amount The amount of ETH to be deposited.
-  /// @param gasLimit Gas limit required to complete the deposit on L2.
-  function depositETH(
-    address to,
-    uint256 amount,
-    uint256 gasLimit
-  ) external payable;
+    /// @notice Deposit ETH to some recipient's account in L2.
+    /// @param to The address of recipient's account on L2.
+    /// @param amount The amount of ETH to be deposited.
+    /// @param gasLimit Gas limit required to complete the deposit on L2.
+    function depositETH(
+        address to,
+        uint256 amount,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Deposit ETH to some recipient's account in L2 and call the target contract.
-  /// @param to The address of recipient's account on L2.
-  /// @param amount The amount of ETH to be deposited.
-  /// @param data Optional data to forward to recipient's account.
-  /// @param gasLimit Gas limit required to complete the deposit on L2.
-  function depositETHAndCall(
-    address to,
-    uint256 amount,
-    bytes calldata data,
-    uint256 gasLimit
-  ) external payable;
+    /// @notice Deposit ETH to some recipient's account in L2 and call the target contract.
+    /// @param to The address of recipient's account on L2.
+    /// @param amount The amount of ETH to be deposited.
+    /// @param data Optional data to forward to recipient's account.
+    /// @param gasLimit Gas limit required to complete the deposit on L2.
+    function depositETHAndCall(
+        address to,
+        uint256 amount,
+        bytes calldata data,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Complete ETH withdraw from L2 to L1 and send fund to recipient's account in L1.
-  /// @dev This function should only be called by L1ScrollMessenger.
-  ///      This function should also only be called by L1ETHGateway in L2.
-  /// @param from The address of account who withdraw ETH in L2.
-  /// @param to The address of recipient in L1 to receive ETH.
-  /// @param amount The amount of ETH to withdraw.
-  /// @param data Optional data to forward to recipient's account.
-  function finalizeWithdrawETH(
-    address from,
-    address to,
-    uint256 amount,
-    bytes calldata data
-  ) external payable;
+    /// @notice Complete ETH withdraw from L2 to L1 and send fund to recipient's account in L1.
+    /// @dev This function should only be called by L1ScrollMessenger.
+    ///      This function should also only be called by L1ETHGateway in L2.
+    /// @param from The address of account who withdraw ETH in L2.
+    /// @param to The address of recipient in L1 to receive ETH.
+    /// @param amount The amount of ETH to withdraw.
+    /// @param data Optional data to forward to recipient's account.
+    function finalizeWithdrawETH(
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata data
+    ) external payable;
 }

contracts/src/L1/gateways/IL1GatewayRouter.sol

@@ -2,24 +2,24 @@
 
 pragma solidity ^0.8.0;
 
-import { IL1ETHGateway } from "./IL1ETHGateway.sol";
-import { IL1ERC20Gateway } from "./IL1ERC20Gateway.sol";
+import {IL1ETHGateway} from "./IL1ETHGateway.sol";
+import {IL1ERC20Gateway} from "./IL1ERC20Gateway.sol";
 
 interface IL1GatewayRouter is IL1ETHGateway, IL1ERC20Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when the address of ETH Gateway is updated.
-  /// @param ethGateway The address of new ETH Gateway.
-  event SetETHGateway(address indexed ethGateway);
+    /// @notice Emitted when the address of ETH Gateway is updated.
+    /// @param ethGateway The address of new ETH Gateway.
+    event SetETHGateway(address indexed ethGateway);
 
-  /// @notice Emitted when the address of default ERC20 Gateway is updated.
-  /// @param defaultERC20Gateway The address of new default ERC20 Gateway.
-  event SetDefaultERC20Gateway(address indexed defaultERC20Gateway);
+    /// @notice Emitted when the address of default ERC20 Gateway is updated.
+    /// @param defaultERC20Gateway The address of new default ERC20 Gateway.
+    event SetDefaultERC20Gateway(address indexed defaultERC20Gateway);
 
-  /// @notice Emitted when the `gateway` for `token` is updated.
-  /// @param token The address of token updated.
-  /// @param gateway The corresponding address of gateway updated.
-  event SetERC20Gateway(address indexed token, address indexed gateway);
+    /// @notice Emitted when the `gateway` for `token` is updated.
+    /// @param token The address of token updated.
+    /// @param gateway The corresponding address of gateway updated.
+    event SetERC20Gateway(address indexed token, address indexed gateway);
 }

contracts/src/L1/gateways/L1CustomERC20Gateway.sol

@@ -2,16 +2,16 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
-import { IERC20Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
-import { SafeERC20Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
+import {SafeERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/utils/SafeERC20Upgradeable.sol";
 
-import { IL2ERC20Gateway } from "../../L2/gateways/IL2ERC20Gateway.sol";
-import { IL1ScrollMessenger } from "../IL1ScrollMessenger.sol";
-import { IL1ERC20Gateway } from "./IL1ERC20Gateway.sol";
+import {IL2ERC20Gateway} from "../../L2/gateways/IL2ERC20Gateway.sol";
+import {IL1ScrollMessenger} from "../IL1ScrollMessenger.sol";
+import {IL1ERC20Gateway} from "./IL1ERC20Gateway.sol";
 
-import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol";
-import { L1ERC20Gateway } from "./L1ERC20Gateway.sol";
+import {ScrollGatewayBase} from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {L1ERC20Gateway} from "./L1ERC20Gateway.sol";
 
 /// @title L1CustomERC20Gateway
 /// @notice The `L1CustomERC20Gateway` is used to deposit custom ERC20 compatible tokens in layer 1 and
@@ -19,139 +19,139 @@ import { L1ERC20Gateway } from "./L1ERC20Gateway.sol";
 /// @dev The deposited tokens are held in this gateway. On finalizing withdraw, the corresponding
 /// tokens will be transfer to the recipient directly.
 contract L1CustomERC20Gateway is OwnableUpgradeable, ScrollGatewayBase, L1ERC20Gateway {
-  using SafeERC20Upgradeable for IERC20Upgradeable;
+    using SafeERC20Upgradeable for IERC20Upgradeable;
 
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when token mapping for ERC20 token is updated.
-  /// @param _l1Token The address of ERC20 token in layer 1.
-  /// @param _l2Token The address of corresponding ERC20 token in layer 2.
-  event UpdateTokenMapping(address _l1Token, address _l2Token);
+    /// @notice Emitted when token mapping for ERC20 token is updated.
+    /// @param _l1Token The address of ERC20 token in layer 1.
+    /// @param _l2Token The address of corresponding ERC20 token in layer 2.
+    event UpdateTokenMapping(address _l1Token, address _l2Token);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from l1 token address to l2 token address for ERC20 token.
-  mapping(address => address) public tokenMapping;
+    /// @notice Mapping from l1 token address to l2 token address for ERC20 token.
+    mapping(address => address) public tokenMapping;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  /// @notice Initialize the storage of L1CustomERC20Gateway.
-  /// @param _counterpart The address of L2CustomERC20Gateway in L2.
-  /// @param _router The address of L1GatewayRouter.
-  /// @param _messenger The address of L1ScrollMessenger.
-  function initialize(
-    address _counterpart,
-    address _router,
-    address _messenger
-  ) external initializer {
-    require(_router != address(0), "zero router address");
+    /// @notice Initialize the storage of L1CustomERC20Gateway.
+    /// @param _counterpart The address of L2CustomERC20Gateway in L2.
+    /// @param _router The address of L1GatewayRouter.
+    /// @param _messenger The address of L1ScrollMessenger.
+    function initialize(
+        address _counterpart,
+        address _router,
+        address _messenger
+    ) external initializer {
+        require(_router != address(0), "zero router address");
 
-    OwnableUpgradeable.__Ownable_init();
-    ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL1ERC20Gateway
-  function getL2ERC20Address(address _l1Token) public view override returns (address) {
-    return tokenMapping[_l1Token];
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL1ERC20Gateway
-  function finalizeWithdrawERC20(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable override onlyCallByCounterpart {
-    require(msg.value == 0, "nonzero msg.value");
-    require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
-
-    // @note can possible trigger reentrant call to this contract or messenger,
-    // but it seems not a big problem.
-    IERC20Upgradeable(_l1Token).safeTransfer(_to, _amount);
-
-    // @todo forward `_data` to `_to` in the near future
-
-    emit FinalizeWithdrawERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
-  }
-
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Update layer 1 to layer 2 token mapping.
-  /// @param _l1Token The address of ERC20 token in layer 1.
-  /// @param _l2Token The address of corresponding ERC20 token in layer 2.
-  function updateTokenMapping(address _l1Token, address _l2Token) external onlyOwner {
-    require(_l2Token != address(0), "map to zero address");
-
-    tokenMapping[_l1Token] = _l2Token;
-
-    emit UpdateTokenMapping(_l1Token, _l2Token);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @inheritdoc L1ERC20Gateway
-  function _deposit(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal virtual override nonReentrant {
-    address _l2Token = tokenMapping[_token];
-    require(_l2Token != address(0), "no corresponding l2 token");
-
-    // 1. Extract real sender if this call is from L1GatewayRouter.
-    address _from = msg.sender;
-    if (router == msg.sender) {
-      (_from, _data) = abi.decode(_data, (address, bytes));
+        OwnableUpgradeable.__Ownable_init();
+        ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
     }
 
-    // 2. Transfer token into this contract.
-    {
-      // common practice to handle fee on transfer token.
-      uint256 _before = IERC20Upgradeable(_token).balanceOf(address(this));
-      IERC20Upgradeable(_token).safeTransferFrom(_from, address(this), _amount);
-      uint256 _after = IERC20Upgradeable(_token).balanceOf(address(this));
-      // no unchecked here, since some weird token may return arbitrary balance.
-      _amount = _after - _before;
-      // ignore weird fee on transfer token
-      require(_amount > 0, "deposit zero amount");
+    /*************************
+     * Public View Functions *
+     *************************/
+
+    /// @inheritdoc IL1ERC20Gateway
+    function getL2ERC20Address(address _l1Token) public view override returns (address) {
+        return tokenMapping[_l1Token];
     }
 
-    // 3. Generate message passed to L2StandardERC20Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL2ERC20Gateway.finalizeDepositERC20.selector,
-      _token,
-      _l2Token,
-      _from,
-      _to,
-      _amount,
-      _data
-    );
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-    // 4. Send message to L1ScrollMessenger.
-    IL1ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, 0, _message, _gasLimit);
+    /// @inheritdoc IL1ERC20Gateway
+    function finalizeWithdrawERC20(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable override onlyCallByCounterpart {
+        require(msg.value == 0, "nonzero msg.value");
+        require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
 
-    emit DepositERC20(_token, _l2Token, _from, _to, _amount, _data);
-  }
+        // @note can possible trigger reentrant call to this contract or messenger,
+        // but it seems not a big problem.
+        IERC20Upgradeable(_l1Token).safeTransfer(_to, _amount);
+
+        // @todo forward `_data` to `_to` in the near future
+
+        emit FinalizeWithdrawERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update layer 1 to layer 2 token mapping.
+    /// @param _l1Token The address of ERC20 token in layer 1.
+    /// @param _l2Token The address of corresponding ERC20 token in layer 2.
+    function updateTokenMapping(address _l1Token, address _l2Token) external onlyOwner {
+        require(_l2Token != address(0), "map to zero address");
+
+        tokenMapping[_l1Token] = _l2Token;
+
+        emit UpdateTokenMapping(_l1Token, _l2Token);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @inheritdoc L1ERC20Gateway
+    function _deposit(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal virtual override nonReentrant {
+        address _l2Token = tokenMapping[_token];
+        require(_l2Token != address(0), "no corresponding l2 token");
+
+        // 1. Extract real sender if this call is from L1GatewayRouter.
+        address _from = msg.sender;
+        if (router == msg.sender) {
+            (_from, _data) = abi.decode(_data, (address, bytes));
+        }
+
+        // 2. Transfer token into this contract.
+        {
+            // common practice to handle fee on transfer token.
+            uint256 _before = IERC20Upgradeable(_token).balanceOf(address(this));
+            IERC20Upgradeable(_token).safeTransferFrom(_from, address(this), _amount);
+            uint256 _after = IERC20Upgradeable(_token).balanceOf(address(this));
+            // no unchecked here, since some weird token may return arbitrary balance.
+            _amount = _after - _before;
+            // ignore weird fee on transfer token
+            require(_amount > 0, "deposit zero amount");
+        }
+
+        // 3. Generate message passed to L2StandardERC20Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL2ERC20Gateway.finalizeDepositERC20.selector,
+            _token,
+            _l2Token,
+            _from,
+            _to,
+            _amount,
+            _data
+        );
+
+        // 4. Send message to L1ScrollMessenger.
+        IL1ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit DepositERC20(_token, _l2Token, _from, _to, _amount, _data);
+    }
 }

contracts/src/L1/gateways/L1ERC1155Gateway.sol

@@ -2,15 +2,15 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
-import { IERC1155Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC1155/IERC1155Upgradeable.sol";
-import { ERC1155HolderUpgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC1155/utils/ERC1155HolderUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {IERC1155Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC1155/IERC1155Upgradeable.sol";
+import {ERC1155HolderUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC1155/utils/ERC1155HolderUpgradeable.sol";
 
-import { IL2ERC1155Gateway } from "../../L2/gateways/IL2ERC1155Gateway.sol";
-import { IL1ScrollMessenger } from "../IL1ScrollMessenger.sol";
-import { IL1ERC1155Gateway } from "./IL1ERC1155Gateway.sol";
+import {IL2ERC1155Gateway} from "../../L2/gateways/IL2ERC1155Gateway.sol";
+import {IL1ScrollMessenger} from "../IL1ScrollMessenger.sol";
+import {IL1ERC1155Gateway} from "./IL1ERC1155Gateway.sol";
 
-import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {ScrollGatewayBase} from "../../libraries/gateway/ScrollGatewayBase.sol";
 
 /// @title L1ERC1155Gateway
 /// @notice The `L1ERC1155Gateway` is used to deposit ERC1155 compatible NFT in layer 1 and
@@ -21,209 +21,209 @@ import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol
 /// This will be changed if we have more specific scenarios.
 // @todo Current implementation doesn't support calling from `L1GatewayRouter`.
 contract L1ERC1155Gateway is OwnableUpgradeable, ERC1155HolderUpgradeable, ScrollGatewayBase, IL1ERC1155Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when token mapping for ERC1155 token is updated.
-  /// @param _l1Token The address of ERC1155 token in layer 1.
-  /// @param _l1Token The address of corresponding ERC1155 token in layer 2.
-  event UpdateTokenMapping(address _l1Token, address _l2Token);
+    /// @notice Emitted when token mapping for ERC1155 token is updated.
+    /// @param _l1Token The address of ERC1155 token in layer 1.
+    /// @param _l1Token The address of corresponding ERC1155 token in layer 2.
+    event UpdateTokenMapping(address _l1Token, address _l2Token);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from l1 token address to l2 token address for ERC1155 NFT.
-  mapping(address => address) public tokenMapping;
+    /// @notice Mapping from l1 token address to l2 token address for ERC1155 NFT.
+    mapping(address => address) public tokenMapping;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  /// @notice Initialize the storage of L1ERC1155Gateway.
-  /// @param _counterpart The address of L2ERC1155Gateway in L2.
-  /// @param _messenger The address of L1ScrollMessenger.
-  function initialize(address _counterpart, address _messenger) external initializer {
-    OwnableUpgradeable.__Ownable_init();
-    ScrollGatewayBase._initialize(_counterpart, address(0), _messenger);
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL1ERC1155Gateway
-  function depositERC1155(
-    address _token,
-    uint256 _tokenId,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    _depositERC1155(_token, msg.sender, _tokenId, _amount, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC1155Gateway
-  function depositERC1155(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    _depositERC1155(_token, _to, _tokenId, _amount, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC1155Gateway
-  function batchDepositERC1155(
-    address _token,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    uint256 _gasLimit
-  ) external payable override {
-    _batchDepositERC1155(_token, msg.sender, _tokenIds, _amounts, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC1155Gateway
-  function batchDepositERC1155(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    uint256 _gasLimit
-  ) external payable override {
-    _batchDepositERC1155(_token, _to, _tokenIds, _amounts, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC1155Gateway
-  function finalizeWithdrawERC1155(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount
-  ) external override nonReentrant onlyCallByCounterpart {
-    require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
-
-    IERC1155Upgradeable(_l1Token).safeTransferFrom(address(this), _to, _tokenId, _amount, "");
-
-    emit FinalizeWithdrawERC1155(_l1Token, _l2Token, _from, _to, _tokenId, _amount);
-  }
-
-  /// @inheritdoc IL1ERC1155Gateway
-  function finalizeBatchWithdrawERC1155(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts
-  ) external override nonReentrant onlyCallByCounterpart {
-    require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
-
-    IERC1155Upgradeable(_l1Token).safeBatchTransferFrom(address(this), _to, _tokenIds, _amounts, "");
-
-    emit FinalizeBatchWithdrawERC1155(_l1Token, _l2Token, _from, _to, _tokenIds, _amounts);
-  }
-
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Update layer 2 to layer 2 token mapping.
-  /// @param _l1Token The address of ERC1155 token in layer 1.
-  /// @param _l1Token The address of corresponding ERC1155 token in layer 2.
-  function updateTokenMapping(address _l1Token, address _l2Token) external onlyOwner {
-    require(_l2Token != address(0), "map to zero address");
-
-    tokenMapping[_l1Token] = _l2Token;
-
-    emit UpdateTokenMapping(_l1Token, _l2Token);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @dev Internal function to deposit ERC1155 NFT to layer 2.
-  /// @param _token The address of ERC1155 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenId The token id to deposit.
-  /// @param _amount The amount of token to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function _depositERC1155(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    require(_amount > 0, "deposit zero amount");
-
-    address _l2Token = tokenMapping[_token];
-    require(_l2Token != address(0), "token not supported");
-
-    // 1. transfer token to this contract
-    IERC1155Upgradeable(_token).safeTransferFrom(msg.sender, address(this), _tokenId, _amount, "");
-
-    // 2. Generate message passed to L2ERC1155Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL2ERC1155Gateway.finalizeDepositERC1155.selector,
-      _token,
-      _l2Token,
-      msg.sender,
-      _to,
-      _tokenId,
-      _amount
-    );
-
-    // 3. Send message to L1ScrollMessenger.
-    IL1ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, 0, _message, _gasLimit);
-
-    emit DepositERC1155(_token, _l2Token, msg.sender, _to, _tokenId, _amount);
-  }
-
-  /// @dev Internal function to batch deposit ERC1155 NFT to layer 2.
-  /// @param _token The address of ERC1155 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenIds The list of token ids to deposit.
-  /// @param _amounts The list of corresponding number of token to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function _batchDepositERC1155(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    require(_tokenIds.length > 0, "no token to deposit");
-    require(_tokenIds.length == _amounts.length, "length mismatch");
-
-    for (uint256 i = 0; i < _amounts.length; i++) {
-      require(_amounts[i] > 0, "deposit zero amount");
+    /// @notice Initialize the storage of L1ERC1155Gateway.
+    /// @param _counterpart The address of L2ERC1155Gateway in L2.
+    /// @param _messenger The address of L1ScrollMessenger.
+    function initialize(address _counterpart, address _messenger) external initializer {
+        OwnableUpgradeable.__Ownable_init();
+        ScrollGatewayBase._initialize(_counterpart, address(0), _messenger);
     }
 
-    address _l2Token = tokenMapping[_token];
-    require(_l2Token != address(0), "token not supported");
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-    // 1. transfer token to this contract
-    IERC1155Upgradeable(_token).safeBatchTransferFrom(msg.sender, address(this), _tokenIds, _amounts, "");
+    /// @inheritdoc IL1ERC1155Gateway
+    function depositERC1155(
+        address _token,
+        uint256 _tokenId,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        _depositERC1155(_token, msg.sender, _tokenId, _amount, _gasLimit);
+    }
 
-    // 2. Generate message passed to L2ERC1155Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL2ERC1155Gateway.finalizeBatchDepositERC1155.selector,
-      _token,
-      _l2Token,
-      msg.sender,
-      _to,
-      _tokenIds,
-      _amounts
-    );
+    /// @inheritdoc IL1ERC1155Gateway
+    function depositERC1155(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        _depositERC1155(_token, _to, _tokenId, _amount, _gasLimit);
+    }
 
-    // 3. Send message to L1ScrollMessenger.
-    IL1ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, 0, _message, _gasLimit);
+    /// @inheritdoc IL1ERC1155Gateway
+    function batchDepositERC1155(
+        address _token,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        uint256 _gasLimit
+    ) external payable override {
+        _batchDepositERC1155(_token, msg.sender, _tokenIds, _amounts, _gasLimit);
+    }
 
-    emit BatchDepositERC1155(_token, _l2Token, msg.sender, _to, _tokenIds, _amounts);
-  }
+    /// @inheritdoc IL1ERC1155Gateway
+    function batchDepositERC1155(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        uint256 _gasLimit
+    ) external payable override {
+        _batchDepositERC1155(_token, _to, _tokenIds, _amounts, _gasLimit);
+    }
+
+    /// @inheritdoc IL1ERC1155Gateway
+    function finalizeWithdrawERC1155(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount
+    ) external override nonReentrant onlyCallByCounterpart {
+        require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
+
+        IERC1155Upgradeable(_l1Token).safeTransferFrom(address(this), _to, _tokenId, _amount, "");
+
+        emit FinalizeWithdrawERC1155(_l1Token, _l2Token, _from, _to, _tokenId, _amount);
+    }
+
+    /// @inheritdoc IL1ERC1155Gateway
+    function finalizeBatchWithdrawERC1155(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts
+    ) external override nonReentrant onlyCallByCounterpart {
+        require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
+
+        IERC1155Upgradeable(_l1Token).safeBatchTransferFrom(address(this), _to, _tokenIds, _amounts, "");
+
+        emit FinalizeBatchWithdrawERC1155(_l1Token, _l2Token, _from, _to, _tokenIds, _amounts);
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update layer 2 to layer 2 token mapping.
+    /// @param _l1Token The address of ERC1155 token in layer 1.
+    /// @param _l1Token The address of corresponding ERC1155 token in layer 2.
+    function updateTokenMapping(address _l1Token, address _l2Token) external onlyOwner {
+        require(_l2Token != address(0), "map to zero address");
+
+        tokenMapping[_l1Token] = _l2Token;
+
+        emit UpdateTokenMapping(_l1Token, _l2Token);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @dev Internal function to deposit ERC1155 NFT to layer 2.
+    /// @param _token The address of ERC1155 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenId The token id to deposit.
+    /// @param _amount The amount of token to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function _depositERC1155(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        require(_amount > 0, "deposit zero amount");
+
+        address _l2Token = tokenMapping[_token];
+        require(_l2Token != address(0), "token not supported");
+
+        // 1. transfer token to this contract
+        IERC1155Upgradeable(_token).safeTransferFrom(msg.sender, address(this), _tokenId, _amount, "");
+
+        // 2. Generate message passed to L2ERC1155Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL2ERC1155Gateway.finalizeDepositERC1155.selector,
+            _token,
+            _l2Token,
+            msg.sender,
+            _to,
+            _tokenId,
+            _amount
+        );
+
+        // 3. Send message to L1ScrollMessenger.
+        IL1ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit DepositERC1155(_token, _l2Token, msg.sender, _to, _tokenId, _amount);
+    }
+
+    /// @dev Internal function to batch deposit ERC1155 NFT to layer 2.
+    /// @param _token The address of ERC1155 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenIds The list of token ids to deposit.
+    /// @param _amounts The list of corresponding number of token to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function _batchDepositERC1155(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        require(_tokenIds.length > 0, "no token to deposit");
+        require(_tokenIds.length == _amounts.length, "length mismatch");
+
+        for (uint256 i = 0; i < _amounts.length; i++) {
+            require(_amounts[i] > 0, "deposit zero amount");
+        }
+
+        address _l2Token = tokenMapping[_token];
+        require(_l2Token != address(0), "token not supported");
+
+        // 1. transfer token to this contract
+        IERC1155Upgradeable(_token).safeBatchTransferFrom(msg.sender, address(this), _tokenIds, _amounts, "");
+
+        // 2. Generate message passed to L2ERC1155Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL2ERC1155Gateway.finalizeBatchDepositERC1155.selector,
+            _token,
+            _l2Token,
+            msg.sender,
+            _to,
+            _tokenIds,
+            _amounts
+        );
+
+        // 3. Send message to L1ScrollMessenger.
+        IL1ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit BatchDepositERC1155(_token, _l2Token, msg.sender, _to, _tokenIds, _amounts);
+    }
 }

contracts/src/L1/gateways/L1ERC20Gateway.sol

@@ -2,61 +2,61 @@
 
 pragma solidity ^0.8.0;
 
-import { IL1ERC20Gateway } from "./IL1ERC20Gateway.sol";
+import {IL1ERC20Gateway} from "./IL1ERC20Gateway.sol";
 
 // solhint-disable no-empty-blocks
 
 abstract contract L1ERC20Gateway is IL1ERC20Gateway {
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @inheritdoc IL1ERC20Gateway
-  function depositERC20(
-    address _token,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    _deposit(_token, msg.sender, _amount, new bytes(0), _gasLimit);
-  }
+    /// @inheritdoc IL1ERC20Gateway
+    function depositERC20(
+        address _token,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        _deposit(_token, msg.sender, _amount, new bytes(0), _gasLimit);
+    }
 
-  /// @inheritdoc IL1ERC20Gateway
-  function depositERC20(
-    address _token,
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    _deposit(_token, _to, _amount, new bytes(0), _gasLimit);
-  }
+    /// @inheritdoc IL1ERC20Gateway
+    function depositERC20(
+        address _token,
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        _deposit(_token, _to, _amount, new bytes(0), _gasLimit);
+    }
 
-  /// @inheritdoc IL1ERC20Gateway
-  function depositERC20AndCall(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) external payable override {
-    _deposit(_token, _to, _amount, _data, _gasLimit);
-  }
+    /// @inheritdoc IL1ERC20Gateway
+    function depositERC20AndCall(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) external payable override {
+        _deposit(_token, _to, _amount, _data, _gasLimit);
+    }
 
-  /**********************
-   * Internal Functions *
-   **********************/
+    /**********************
+     * Internal Functions *
+     **********************/
 
-  /// @dev Internal function to do all the deposit operations.
-  ///
-  /// @param _token The token to deposit.
-  /// @param _to The recipient address to recieve the token in L2.
-  /// @param _amount The amount of token to deposit.
-  /// @param _data Optional data to forward to recipient's account.
-  /// @param _gasLimit Gas limit required to complete the deposit on L2.
-  function _deposit(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal virtual;
+    /// @dev Internal function to do all the deposit operations.
+    ///
+    /// @param _token The token to deposit.
+    /// @param _to The recipient address to recieve the token in L2.
+    /// @param _amount The amount of token to deposit.
+    /// @param _data Optional data to forward to recipient's account.
+    /// @param _gasLimit Gas limit required to complete the deposit on L2.
+    function _deposit(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal virtual;
 }

contracts/src/L1/gateways/L1ERC721Gateway.sol

@@ -2,15 +2,15 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
-import { IERC721Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
-import { ERC721HolderUpgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC721/utils/ERC721HolderUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
+import {ERC721HolderUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/utils/ERC721HolderUpgradeable.sol";
 
-import { IL2ERC721Gateway } from "../../L2/gateways/IL2ERC721Gateway.sol";
-import { IL1ScrollMessenger } from "../IL1ScrollMessenger.sol";
-import { IL1ERC721Gateway } from "./IL1ERC721Gateway.sol";
+import {IL2ERC721Gateway} from "../../L2/gateways/IL2ERC721Gateway.sol";
+import {IL1ScrollMessenger} from "../IL1ScrollMessenger.sol";
+import {IL1ERC721Gateway} from "./IL1ERC721Gateway.sol";
 
-import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {ScrollGatewayBase} from "../../libraries/gateway/ScrollGatewayBase.sol";
 
 /// @title L1ERC721Gateway
 /// @notice The `L1ERC721Gateway` is used to deposit ERC721 compatible NFT in layer 1 and
@@ -21,194 +21,194 @@ import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol
 /// This will be changed if we have more specific scenarios.
 // @todo Current implementation doesn't support calling from `L1GatewayRouter`.
 contract L1ERC721Gateway is OwnableUpgradeable, ERC721HolderUpgradeable, ScrollGatewayBase, IL1ERC721Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when token mapping for ERC721 token is updated.
-  /// @param _l1Token The address of ERC721 token in layer 1.
-  /// @param _l1Token The address of corresponding ERC721 token in layer 2.
-  event UpdateTokenMapping(address _l1Token, address _l2Token);
+    /// @notice Emitted when token mapping for ERC721 token is updated.
+    /// @param _l1Token The address of ERC721 token in layer 1.
+    /// @param _l1Token The address of corresponding ERC721 token in layer 2.
+    event UpdateTokenMapping(address _l1Token, address _l2Token);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from l1 token address to l2 token address for ERC721 NFT.
-  mapping(address => address) public tokenMapping;
+    /// @notice Mapping from l1 token address to l2 token address for ERC721 NFT.
+    mapping(address => address) public tokenMapping;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  /// @notice Initialize the storage of L1ERC721Gateway.
-  /// @param _counterpart The address of L2ERC721Gateway in L2.
-  /// @param _messenger The address of L1ScrollMessenger.
-  function initialize(address _counterpart, address _messenger) external initializer {
-    OwnableUpgradeable.__Ownable_init();
-    ScrollGatewayBase._initialize(_counterpart, address(0), _messenger);
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL1ERC721Gateway
-  function depositERC721(
-    address _token,
-    uint256 _tokenId,
-    uint256 _gasLimit
-  ) external payable override {
-    _depositERC721(_token, msg.sender, _tokenId, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC721Gateway
-  function depositERC721(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _gasLimit
-  ) external payable override {
-    _depositERC721(_token, _to, _tokenId, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC721Gateway
-  function batchDepositERC721(
-    address _token,
-    uint256[] calldata _tokenIds,
-    uint256 _gasLimit
-  ) external payable override {
-    _batchDepositERC721(_token, msg.sender, _tokenIds, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC721Gateway
-  function batchDepositERC721(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256 _gasLimit
-  ) external payable override {
-    _batchDepositERC721(_token, _to, _tokenIds, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC721Gateway
-  function finalizeWithdrawERC721(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _tokenId
-  ) external override nonReentrant onlyCallByCounterpart {
-    require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
-
-    IERC721Upgradeable(_l1Token).safeTransferFrom(address(this), _to, _tokenId);
-
-    emit FinalizeWithdrawERC721(_l1Token, _l2Token, _from, _to, _tokenId);
-  }
-
-  /// @inheritdoc IL1ERC721Gateway
-  function finalizeBatchWithdrawERC721(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256[] calldata _tokenIds
-  ) external override nonReentrant onlyCallByCounterpart {
-    require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
-
-    for (uint256 i = 0; i < _tokenIds.length; i++) {
-      IERC721Upgradeable(_l1Token).safeTransferFrom(address(this), _to, _tokenIds[i]);
+    /// @notice Initialize the storage of L1ERC721Gateway.
+    /// @param _counterpart The address of L2ERC721Gateway in L2.
+    /// @param _messenger The address of L1ScrollMessenger.
+    function initialize(address _counterpart, address _messenger) external initializer {
+        OwnableUpgradeable.__Ownable_init();
+        ScrollGatewayBase._initialize(_counterpart, address(0), _messenger);
     }
 
-    emit FinalizeBatchWithdrawERC721(_l1Token, _l2Token, _from, _to, _tokenIds);
-  }
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Update layer 2 to layer 2 token mapping.
-  /// @param _l1Token The address of ERC721 token in layer 1.
-  /// @param _l1Token The address of corresponding ERC721 token in layer 2.
-  function updateTokenMapping(address _l1Token, address _l2Token) external onlyOwner {
-    require(_l2Token != address(0), "map to zero address");
-
-    tokenMapping[_l1Token] = _l2Token;
-
-    emit UpdateTokenMapping(_l1Token, _l2Token);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @dev Internal function to deposit ERC721 NFT to layer 2.
-  /// @param _token The address of ERC721 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenId The token id to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function _depositERC721(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    address _l2Token = tokenMapping[_token];
-    require(_l2Token != address(0), "token not supported");
-
-    // 1. transfer token to this contract
-    IERC721Upgradeable(_token).safeTransferFrom(msg.sender, address(this), _tokenId);
-
-    // 2. Generate message passed to L2ERC721Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL2ERC721Gateway.finalizeDepositERC721.selector,
-      _token,
-      _l2Token,
-      msg.sender,
-      _to,
-      _tokenId
-    );
-
-    // 3. Send message to L1ScrollMessenger.
-    IL1ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, 0, _message, _gasLimit);
-
-    emit DepositERC721(_token, _l2Token, msg.sender, _to, _tokenId);
-  }
-
-  /// @dev Internal function to batch deposit ERC721 NFT to layer 2.
-  /// @param _token The address of ERC721 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenIds The list of token ids to deposit.
-  /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
-  function _batchDepositERC721(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    require(_tokenIds.length > 0, "no token to deposit");
-
-    address _l2Token = tokenMapping[_token];
-    require(_l2Token != address(0), "token not supported");
-
-    // 1. transfer token to this contract
-    for (uint256 i = 0; i < _tokenIds.length; i++) {
-      IERC721Upgradeable(_token).safeTransferFrom(msg.sender, address(this), _tokenIds[i]);
+    /// @inheritdoc IL1ERC721Gateway
+    function depositERC721(
+        address _token,
+        uint256 _tokenId,
+        uint256 _gasLimit
+    ) external payable override {
+        _depositERC721(_token, msg.sender, _tokenId, _gasLimit);
     }
 
-    // 2. Generate message passed to L2ERC721Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL2ERC721Gateway.finalizeBatchDepositERC721.selector,
-      _token,
-      _l2Token,
-      msg.sender,
-      _to,
-      _tokenIds
-    );
+    /// @inheritdoc IL1ERC721Gateway
+    function depositERC721(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _gasLimit
+    ) external payable override {
+        _depositERC721(_token, _to, _tokenId, _gasLimit);
+    }
 
-    // 3. Send message to L1ScrollMessenger.
-    IL1ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, 0, _message, _gasLimit);
+    /// @inheritdoc IL1ERC721Gateway
+    function batchDepositERC721(
+        address _token,
+        uint256[] calldata _tokenIds,
+        uint256 _gasLimit
+    ) external payable override {
+        _batchDepositERC721(_token, msg.sender, _tokenIds, _gasLimit);
+    }
 
-    emit BatchDepositERC721(_token, _l2Token, msg.sender, _to, _tokenIds);
-  }
+    /// @inheritdoc IL1ERC721Gateway
+    function batchDepositERC721(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256 _gasLimit
+    ) external payable override {
+        _batchDepositERC721(_token, _to, _tokenIds, _gasLimit);
+    }
+
+    /// @inheritdoc IL1ERC721Gateway
+    function finalizeWithdrawERC721(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _tokenId
+    ) external override nonReentrant onlyCallByCounterpart {
+        require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
+
+        IERC721Upgradeable(_l1Token).safeTransferFrom(address(this), _to, _tokenId);
+
+        emit FinalizeWithdrawERC721(_l1Token, _l2Token, _from, _to, _tokenId);
+    }
+
+    /// @inheritdoc IL1ERC721Gateway
+    function finalizeBatchWithdrawERC721(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256[] calldata _tokenIds
+    ) external override nonReentrant onlyCallByCounterpart {
+        require(_l2Token == tokenMapping[_l1Token], "l2 token mismatch");
+
+        for (uint256 i = 0; i < _tokenIds.length; i++) {
+            IERC721Upgradeable(_l1Token).safeTransferFrom(address(this), _to, _tokenIds[i]);
+        }
+
+        emit FinalizeBatchWithdrawERC721(_l1Token, _l2Token, _from, _to, _tokenIds);
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update layer 2 to layer 2 token mapping.
+    /// @param _l1Token The address of ERC721 token in layer 1.
+    /// @param _l1Token The address of corresponding ERC721 token in layer 2.
+    function updateTokenMapping(address _l1Token, address _l2Token) external onlyOwner {
+        require(_l2Token != address(0), "map to zero address");
+
+        tokenMapping[_l1Token] = _l2Token;
+
+        emit UpdateTokenMapping(_l1Token, _l2Token);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @dev Internal function to deposit ERC721 NFT to layer 2.
+    /// @param _token The address of ERC721 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenId The token id to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function _depositERC721(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        address _l2Token = tokenMapping[_token];
+        require(_l2Token != address(0), "token not supported");
+
+        // 1. transfer token to this contract
+        IERC721Upgradeable(_token).safeTransferFrom(msg.sender, address(this), _tokenId);
+
+        // 2. Generate message passed to L2ERC721Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL2ERC721Gateway.finalizeDepositERC721.selector,
+            _token,
+            _l2Token,
+            msg.sender,
+            _to,
+            _tokenId
+        );
+
+        // 3. Send message to L1ScrollMessenger.
+        IL1ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit DepositERC721(_token, _l2Token, msg.sender, _to, _tokenId);
+    }
+
+    /// @dev Internal function to batch deposit ERC721 NFT to layer 2.
+    /// @param _token The address of ERC721 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenIds The list of token ids to deposit.
+    /// @param _gasLimit Estimated gas limit required to complete the deposit on layer 2.
+    function _batchDepositERC721(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        require(_tokenIds.length > 0, "no token to deposit");
+
+        address _l2Token = tokenMapping[_token];
+        require(_l2Token != address(0), "token not supported");
+
+        // 1. transfer token to this contract
+        for (uint256 i = 0; i < _tokenIds.length; i++) {
+            IERC721Upgradeable(_token).safeTransferFrom(msg.sender, address(this), _tokenIds[i]);
+        }
+
+        // 2. Generate message passed to L2ERC721Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL2ERC721Gateway.finalizeBatchDepositERC721.selector,
+            _token,
+            _l2Token,
+            msg.sender,
+            _to,
+            _tokenIds
+        );
+
+        // 3. Send message to L1ScrollMessenger.
+        IL1ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit BatchDepositERC721(_token, _l2Token, msg.sender, _to, _tokenIds);
+    }
 }

contracts/src/L1/gateways/L1ETHGateway.sol

@@ -2,13 +2,13 @@
 
 pragma solidity ^0.8.0;
 
-import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
+import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
 
-import { IL2ETHGateway } from "../../L2/gateways/IL2ETHGateway.sol";
-import { IL1ScrollMessenger } from "../IL1ScrollMessenger.sol";
-import { IL1ETHGateway } from "./IL1ETHGateway.sol";
+import {IL2ETHGateway} from "../../L2/gateways/IL2ETHGateway.sol";
+import {IL1ScrollMessenger} from "../IL1ScrollMessenger.sol";
+import {IL1ETHGateway} from "./IL1ETHGateway.sol";
 
-import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {ScrollGatewayBase} from "../../libraries/gateway/ScrollGatewayBase.sol";
 
 /// @title L1ETHGateway
 /// @notice The `L1ETHGateway` is used to deposit ETH in layer 1 and
@@ -16,103 +16,103 @@ import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol
 /// @dev The deposited ETH tokens are held in this gateway. On finalizing withdraw, the corresponding
 /// ETH will be transfer to the recipient directly.
 contract L1ETHGateway is Initializable, ScrollGatewayBase, IL1ETHGateway {
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  /// @notice Initialize the storage of L1ETHGateway.
-  /// @param _counterpart The address of L2ETHGateway in L2.
-  /// @param _router The address of L1GatewayRouter.
-  /// @param _messenger The address of L1ScrollMessenger.
-  function initialize(
-    address _counterpart,
-    address _router,
-    address _messenger
-  ) external initializer {
-    require(_router != address(0), "zero router address");
-    ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL1ETHGateway
-  function depositETH(uint256 _amount, uint256 _gasLimit) external payable override {
-    _deposit(msg.sender, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL1ETHGateway
-  function depositETH(
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) public payable override {
-    _deposit(_to, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL1ETHGateway
-  function depositETHAndCall(
-    address _to,
-    uint256 _amount,
-    bytes calldata _data,
-    uint256 _gasLimit
-  ) external payable override {
-    _deposit(_to, _amount, _data, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ETHGateway
-  function finalizeWithdrawETH(
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable override onlyCallByCounterpart {
-    // @note can possible trigger reentrant call to this contract or messenger,
-    // but it seems not a big problem.
-    // solhint-disable-next-line avoid-low-level-calls
-    (bool _success, ) = _to.call{ value: _amount }("");
-    require(_success, "ETH transfer failed");
-
-    // @todo farward _data to `_to` in near future.
-
-    emit FinalizeWithdrawETH(_from, _to, _amount, _data);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @dev The internal ETH deposit implementation.
-  /// @param _to The address of recipient's account on L2.
-  /// @param _amount The amount of ETH to be deposited.
-  /// @param _data Optional data to forward to recipient's account.
-  /// @param _gasLimit Gas limit required to complete the deposit on L2.
-  function _deposit(
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    require(_amount > 0, "deposit zero eth");
-
-    // 1. Extract real sender if this call is from L1GatewayRouter.
-    address _from = msg.sender;
-    if (router == msg.sender) {
-      (_from, _data) = abi.decode(_data, (address, bytes));
+    /// @notice Initialize the storage of L1ETHGateway.
+    /// @param _counterpart The address of L2ETHGateway in L2.
+    /// @param _router The address of L1GatewayRouter.
+    /// @param _messenger The address of L1ScrollMessenger.
+    function initialize(
+        address _counterpart,
+        address _router,
+        address _messenger
+    ) external initializer {
+        require(_router != address(0), "zero router address");
+        ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
     }
 
-    // 2. Generate message passed to L1ScrollMessenger.
-    bytes memory _message = abi.encodeWithSelector(
-      IL2ETHGateway.finalizeDepositETH.selector,
-      _from,
-      _to,
-      _amount,
-      _data
-    );
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-    IL1ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, _amount, _message, _gasLimit);
+    /// @inheritdoc IL1ETHGateway
+    function depositETH(uint256 _amount, uint256 _gasLimit) external payable override {
+        _deposit(msg.sender, _amount, new bytes(0), _gasLimit);
+    }
 
-    emit DepositETH(_from, _to, _amount, _data);
-  }
+    /// @inheritdoc IL1ETHGateway
+    function depositETH(
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) public payable override {
+        _deposit(_to, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL1ETHGateway
+    function depositETHAndCall(
+        address _to,
+        uint256 _amount,
+        bytes calldata _data,
+        uint256 _gasLimit
+    ) external payable override {
+        _deposit(_to, _amount, _data, _gasLimit);
+    }
+
+    /// @inheritdoc IL1ETHGateway
+    function finalizeWithdrawETH(
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable override onlyCallByCounterpart {
+        // @note can possible trigger reentrant call to this contract or messenger,
+        // but it seems not a big problem.
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool _success, ) = _to.call{value: _amount}("");
+        require(_success, "ETH transfer failed");
+
+        // @todo farward _data to `_to` in near future.
+
+        emit FinalizeWithdrawETH(_from, _to, _amount, _data);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @dev The internal ETH deposit implementation.
+    /// @param _to The address of recipient's account on L2.
+    /// @param _amount The amount of ETH to be deposited.
+    /// @param _data Optional data to forward to recipient's account.
+    /// @param _gasLimit Gas limit required to complete the deposit on L2.
+    function _deposit(
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        require(_amount > 0, "deposit zero eth");
+
+        // 1. Extract real sender if this call is from L1GatewayRouter.
+        address _from = msg.sender;
+        if (router == msg.sender) {
+            (_from, _data) = abi.decode(_data, (address, bytes));
+        }
+
+        // 2. Generate message passed to L1ScrollMessenger.
+        bytes memory _message = abi.encodeWithSelector(
+            IL2ETHGateway.finalizeDepositETH.selector,
+            _from,
+            _to,
+            _amount,
+            _data
+        );
+
+        IL1ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, _amount, _message, _gasLimit);
+
+        emit DepositETH(_from, _to, _amount, _data);
+    }
 }

contracts/src/L1/gateways/L1GatewayRouter.sol

@@ -2,14 +2,14 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
 
-import { IL2GatewayRouter } from "../../L2/gateways/IL2GatewayRouter.sol";
-import { IScrollGateway } from "../../libraries/gateway/IScrollGateway.sol";
-import { IL1ScrollMessenger } from "../IL1ScrollMessenger.sol";
-import { IL1ETHGateway } from "./IL1ETHGateway.sol";
-import { IL1ERC20Gateway } from "./IL1ERC20Gateway.sol";
-import { IL1GatewayRouter } from "./IL1GatewayRouter.sol";
+import {IL2GatewayRouter} from "../../L2/gateways/IL2GatewayRouter.sol";
+import {IScrollGateway} from "../../libraries/gateway/IScrollGateway.sol";
+import {IL1ScrollMessenger} from "../IL1ScrollMessenger.sol";
+import {IL1ETHGateway} from "./IL1ETHGateway.sol";
+import {IL1ERC20Gateway} from "./IL1ERC20Gateway.sol";
+import {IL1GatewayRouter} from "./IL1GatewayRouter.sol";
 
 /// @title L1GatewayRouter
 /// @notice The `L1GatewayRouter` is the main entry for depositing Ether and ERC20 tokens.
@@ -17,198 +17,198 @@ import { IL1GatewayRouter } from "./IL1GatewayRouter.sol";
 /// @dev One can also use this contract to query L1/L2 token address mapping.
 /// In the future, ERC-721 and ERC-1155 tokens will be added to the router too.
 contract L1GatewayRouter is OwnableUpgradeable, IL1GatewayRouter {
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice The address of L1ETHGateway.
-  address public ethGateway;
+    /// @notice The address of L1ETHGateway.
+    address public ethGateway;
 
-  /// @notice The addess of default ERC20 gateway, normally the L1StandardERC20Gateway contract.
-  address public defaultERC20Gateway;
+    /// @notice The addess of default ERC20 gateway, normally the L1StandardERC20Gateway contract.
+    address public defaultERC20Gateway;
 
-  /// @notice Mapping from ERC20 token address to corresponding L1ERC20Gateway.
-  // solhint-disable-next-line var-name-mixedcase
-  mapping(address => address) public ERC20Gateway;
+    /// @notice Mapping from ERC20 token address to corresponding L1ERC20Gateway.
+    // solhint-disable-next-line var-name-mixedcase
+    mapping(address => address) public ERC20Gateway;
 
-  // @todo: add ERC721/ERC1155 Gateway mapping.
+    // @todo: add ERC721/ERC1155 Gateway mapping.
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  /// @notice Initialize the storage of L1GatewayRouter.
-  /// @param _ethGateway The address of L1ETHGateway contract.
-  /// @param _defaultERC20Gateway The address of default ERC20 Gateway contract.
-  function initialize(address _ethGateway, address _defaultERC20Gateway) external initializer {
-    OwnableUpgradeable.__Ownable_init();
+    /// @notice Initialize the storage of L1GatewayRouter.
+    /// @param _ethGateway The address of L1ETHGateway contract.
+    /// @param _defaultERC20Gateway The address of default ERC20 Gateway contract.
+    function initialize(address _ethGateway, address _defaultERC20Gateway) external initializer {
+        OwnableUpgradeable.__Ownable_init();
 
-    // it can be zero during initialization
-    if (_defaultERC20Gateway != address(0)) {
-      defaultERC20Gateway = _defaultERC20Gateway;
-      emit SetDefaultERC20Gateway(_defaultERC20Gateway);
+        // it can be zero during initialization
+        if (_defaultERC20Gateway != address(0)) {
+            defaultERC20Gateway = _defaultERC20Gateway;
+            emit SetDefaultERC20Gateway(_defaultERC20Gateway);
+        }
+
+        // it can be zero during initialization
+        if (_ethGateway != address(0)) {
+            ethGateway = _ethGateway;
+            emit SetETHGateway(_ethGateway);
+        }
     }
 
-    // it can be zero during initialization
-    if (_ethGateway != address(0)) {
-      ethGateway = _ethGateway;
-      emit SetETHGateway(_ethGateway);
-    }
-  }
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /// @inheritdoc IL1ERC20Gateway
+    function getL2ERC20Address(address _l1Address) external view override returns (address) {
+        address _gateway = getERC20Gateway(_l1Address);
+        if (_gateway == address(0)) {
+            return address(0);
+        }
 
-  /// @inheritdoc IL1ERC20Gateway
-  function getL2ERC20Address(address _l1Address) external view override returns (address) {
-    address _gateway = getERC20Gateway(_l1Address);
-    if (_gateway == address(0)) {
-      return address(0);
+        return IL1ERC20Gateway(_gateway).getL2ERC20Address(_l1Address);
     }
 
-    return IL1ERC20Gateway(_gateway).getL2ERC20Address(_l1Address);
-  }
-
-  /// @notice Return the corresponding gateway address for given token address.
-  /// @param _token The address of token to query.
-  function getERC20Gateway(address _token) public view returns (address) {
-    address _gateway = ERC20Gateway[_token];
-    if (_gateway == address(0)) {
-      _gateway = defaultERC20Gateway;
+    /// @notice Return the corresponding gateway address for given token address.
+    /// @param _token The address of token to query.
+    function getERC20Gateway(address _token) public view returns (address) {
+        address _gateway = ERC20Gateway[_token];
+        if (_gateway == address(0)) {
+            _gateway = defaultERC20Gateway;
+        }
+        return _gateway;
     }
-    return _gateway;
-  }
 
-  /************************************************
-   * Public Mutated Functions from L1ERC20Gateway *
-   ************************************************/
+    /*************************************************
+     * Public Mutating Functions from L1ERC20Gateway *
+     *************************************************/
 
-  /// @inheritdoc IL1ERC20Gateway
-  function depositERC20(
-    address _token,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    depositERC20AndCall(_token, msg.sender, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC20Gateway
-  function depositERC20(
-    address _token,
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    depositERC20AndCall(_token, _to, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC20Gateway
-  function depositERC20AndCall(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) public payable override {
-    address _gateway = getERC20Gateway(_token);
-    require(_gateway != address(0), "no gateway available");
-
-    // encode msg.sender with _data
-    bytes memory _routerData = abi.encode(msg.sender, _data);
-
-    IL1ERC20Gateway(_gateway).depositERC20AndCall{ value: msg.value }(_token, _to, _amount, _routerData, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ERC20Gateway
-  function finalizeWithdrawERC20(
-    address,
-    address,
-    address,
-    address,
-    uint256,
-    bytes calldata
-  ) external payable virtual override {
-    revert("should never be called");
-  }
-
-  /**********************************************
-   * Public Mutated Functions from L1ETHGateway *
-   **********************************************/
-
-  /// @inheritdoc IL1ETHGateway
-  function depositETH(uint256 _amount, uint256 _gasLimit) external payable override {
-    depositETHAndCall(msg.sender, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL1ETHGateway
-  function depositETH(
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    depositETHAndCall(_to, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL1ETHGateway
-  function depositETHAndCall(
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) public payable override {
-    address _gateway = ethGateway;
-    require(_gateway != address(0), "eth gateway available");
-
-    // encode msg.sender with _data
-    bytes memory _routerData = abi.encode(msg.sender, _data);
-
-    IL1ETHGateway(_gateway).depositETHAndCall{ value: msg.value }(_to, _amount, _routerData, _gasLimit);
-  }
-
-  /// @inheritdoc IL1ETHGateway
-  function finalizeWithdrawETH(
-    address,
-    address,
-    uint256,
-    bytes calldata
-  ) external payable virtual override {
-    revert("should never be called");
-  }
-
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Update the address of ETH gateway contract.
-  /// @dev This function should only be called by contract owner.
-  /// @param _ethGateway The address to update.
-  function setETHGateway(address _ethGateway) external onlyOwner {
-    ethGateway = _ethGateway;
-
-    emit SetETHGateway(_ethGateway);
-  }
-
-  /// @notice Update the address of default ERC20 gateway contract.
-  /// @dev This function should only be called by contract owner.
-  /// @param _defaultERC20Gateway The address to update.
-  function setDefaultERC20Gateway(address _defaultERC20Gateway) external onlyOwner {
-    defaultERC20Gateway = _defaultERC20Gateway;
-
-    emit SetDefaultERC20Gateway(_defaultERC20Gateway);
-  }
-
-  /// @notice Update the mapping from token address to gateway address.
-  /// @dev This function should only be called by contract owner.
-  /// @param _tokens The list of addresses of tokens to update.
-  /// @param _gateways The list of addresses of gateways to update.
-  function setERC20Gateway(address[] memory _tokens, address[] memory _gateways) external onlyOwner {
-    require(_tokens.length == _gateways.length, "length mismatch");
-
-    for (uint256 i = 0; i < _tokens.length; i++) {
-      ERC20Gateway[_tokens[i]] = _gateways[i];
-
-      emit SetERC20Gateway(_tokens[i], _gateways[i]);
+    /// @inheritdoc IL1ERC20Gateway
+    function depositERC20(
+        address _token,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        depositERC20AndCall(_token, msg.sender, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL1ERC20Gateway
+    function depositERC20(
+        address _token,
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        depositERC20AndCall(_token, _to, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL1ERC20Gateway
+    function depositERC20AndCall(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) public payable override {
+        address _gateway = getERC20Gateway(_token);
+        require(_gateway != address(0), "no gateway available");
+
+        // encode msg.sender with _data
+        bytes memory _routerData = abi.encode(msg.sender, _data);
+
+        IL1ERC20Gateway(_gateway).depositERC20AndCall{value: msg.value}(_token, _to, _amount, _routerData, _gasLimit);
+    }
+
+    /// @inheritdoc IL1ERC20Gateway
+    function finalizeWithdrawERC20(
+        address,
+        address,
+        address,
+        address,
+        uint256,
+        bytes calldata
+    ) external payable virtual override {
+        revert("should never be called");
+    }
+
+    /***********************************************
+     * Public Mutating Functions from L1ETHGateway *
+     ***********************************************/
+
+    /// @inheritdoc IL1ETHGateway
+    function depositETH(uint256 _amount, uint256 _gasLimit) external payable override {
+        depositETHAndCall(msg.sender, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL1ETHGateway
+    function depositETH(
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        depositETHAndCall(_to, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL1ETHGateway
+    function depositETHAndCall(
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) public payable override {
+        address _gateway = ethGateway;
+        require(_gateway != address(0), "eth gateway available");
+
+        // encode msg.sender with _data
+        bytes memory _routerData = abi.encode(msg.sender, _data);
+
+        IL1ETHGateway(_gateway).depositETHAndCall{value: msg.value}(_to, _amount, _routerData, _gasLimit);
+    }
+
+    /// @inheritdoc IL1ETHGateway
+    function finalizeWithdrawETH(
+        address,
+        address,
+        uint256,
+        bytes calldata
+    ) external payable virtual override {
+        revert("should never be called");
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update the address of ETH gateway contract.
+    /// @dev This function should only be called by contract owner.
+    /// @param _ethGateway The address to update.
+    function setETHGateway(address _ethGateway) external onlyOwner {
+        ethGateway = _ethGateway;
+
+        emit SetETHGateway(_ethGateway);
+    }
+
+    /// @notice Update the address of default ERC20 gateway contract.
+    /// @dev This function should only be called by contract owner.
+    /// @param _defaultERC20Gateway The address to update.
+    function setDefaultERC20Gateway(address _defaultERC20Gateway) external onlyOwner {
+        defaultERC20Gateway = _defaultERC20Gateway;
+
+        emit SetDefaultERC20Gateway(_defaultERC20Gateway);
+    }
+
+    /// @notice Update the mapping from token address to gateway address.
+    /// @dev This function should only be called by contract owner.
+    /// @param _tokens The list of addresses of tokens to update.
+    /// @param _gateways The list of addresses of gateways to update.
+    function setERC20Gateway(address[] memory _tokens, address[] memory _gateways) external onlyOwner {
+        require(_tokens.length == _gateways.length, "length mismatch");
+
+        for (uint256 i = 0; i < _tokens.length; i++) {
+            ERC20Gateway[_tokens[i]] = _gateways[i];
+
+            emit SetERC20Gateway(_tokens[i], _gateways[i]);
+        }
     }
-  }
 }

contracts/src/L1/gateways/L1StandardERC20Gateway.sol

@@ -2,18 +2,18 @@
 
 pragma solidity ^0.8.0;
 
-import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
-import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
-import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
-import { Clones } from "@openzeppelin/contracts/proxy/Clones.sol";
+import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
+import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import {Clones} from "@openzeppelin/contracts/proxy/Clones.sol";
 
-import { IERC20Metadata } from "../../interfaces/IERC20Metadata.sol";
-import { IL2ERC20Gateway } from "../../L2/gateways/IL2ERC20Gateway.sol";
-import { IL1ScrollMessenger } from "../IL1ScrollMessenger.sol";
-import { IL1ERC20Gateway } from "./IL1ERC20Gateway.sol";
+import {IERC20Metadata} from "../../interfaces/IERC20Metadata.sol";
+import {IL2ERC20Gateway} from "../../L2/gateways/IL2ERC20Gateway.sol";
+import {IL1ScrollMessenger} from "../IL1ScrollMessenger.sol";
+import {IL1ERC20Gateway} from "./IL1ERC20Gateway.sol";
 
-import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol";
-import { L1ERC20Gateway } from "./L1ERC20Gateway.sol";
+import {ScrollGatewayBase} from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {L1ERC20Gateway} from "./L1ERC20Gateway.sol";
 
 /// @title L1StandardERC20Gateway
 /// @notice The `L1StandardERC20Gateway` is used to deposit standard ERC20 tokens in layer 1 and
@@ -22,147 +22,147 @@ import { L1ERC20Gateway } from "./L1ERC20Gateway.sol";
 /// token will be transfer to the recipient directly. Any ERC20 that requires non-standard functionality
 /// should use a separate gateway.
 contract L1StandardERC20Gateway is Initializable, ScrollGatewayBase, L1ERC20Gateway {
-  using SafeERC20 for IERC20;
+    using SafeERC20 for IERC20;
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice The address of ScrollStandardERC20 implementation in L2.
-  address public l2TokenImplementation;
+    /// @notice The address of ScrollStandardERC20 implementation in L2.
+    address public l2TokenImplementation;
 
-  /// @notice The address of ScrollStandardERC20Factory contract in L2.
-  address public l2TokenFactory;
+    /// @notice The address of ScrollStandardERC20Factory contract in L2.
+    address public l2TokenFactory;
 
-  /// @notice Mapping from l1 token address to l2 token address.
-  /// @dev This is not necessary, since we can compute the address directly. But, we use this mapping
-  /// to keep track on whether we have deployed the token in L2 using the L2ScrollStandardERC20Factory and
-  /// pass deploy data on first call to the token.
-  mapping(address => address) private tokenMapping;
+    /// @notice Mapping from l1 token address to l2 token address.
+    /// @dev This is not necessary, since we can compute the address directly. But, we use this mapping
+    /// to keep track on whether we have deployed the token in L2 using the L2ScrollStandardERC20Factory and
+    /// pass deploy data on first call to the token.
+    mapping(address => address) private tokenMapping;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  /// @notice Initialize the storage of L1StandardERC20Gateway.
-  /// @param _counterpart The address of L2StandardERC20Gateway in L2.
-  /// @param _router The address of L1GatewayRouter.
-  /// @param _messenger The address of L1ScrollMessenger.
-  /// @param _l2TokenImplementation The address of ScrollStandardERC20 implementation in L2.
-  /// @param _l2TokenFactory The address of ScrollStandardERC20Factory contract in L2.
-  function initialize(
-    address _counterpart,
-    address _router,
-    address _messenger,
-    address _l2TokenImplementation,
-    address _l2TokenFactory
-  ) external initializer {
-    require(_router != address(0), "zero router address");
-    ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
+    /// @notice Initialize the storage of L1StandardERC20Gateway.
+    /// @param _counterpart The address of L2StandardERC20Gateway in L2.
+    /// @param _router The address of L1GatewayRouter.
+    /// @param _messenger The address of L1ScrollMessenger.
+    /// @param _l2TokenImplementation The address of ScrollStandardERC20 implementation in L2.
+    /// @param _l2TokenFactory The address of ScrollStandardERC20Factory contract in L2.
+    function initialize(
+        address _counterpart,
+        address _router,
+        address _messenger,
+        address _l2TokenImplementation,
+        address _l2TokenFactory
+    ) external initializer {
+        require(_router != address(0), "zero router address");
+        ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
 
-    require(_l2TokenImplementation != address(0), "zero implementation hash");
-    require(_l2TokenFactory != address(0), "zero factory address");
+        require(_l2TokenImplementation != address(0), "zero implementation hash");
+        require(_l2TokenFactory != address(0), "zero factory address");
 
-    l2TokenImplementation = _l2TokenImplementation;
-    l2TokenFactory = _l2TokenFactory;
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL1ERC20Gateway
-  function getL2ERC20Address(address _l1Token) public view override returns (address) {
-    // In StandardERC20Gateway, all corresponding l2 tokens are depoyed by Create2 with salt,
-    // we can calculate the l2 address directly.
-    bytes32 _salt = keccak256(abi.encodePacked(counterpart, keccak256(abi.encodePacked(_l1Token))));
-
-    return Clones.predictDeterministicAddress(l2TokenImplementation, _salt, l2TokenFactory);
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL1ERC20Gateway
-  function finalizeWithdrawERC20(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable override onlyCallByCounterpart {
-    require(msg.value == 0, "nonzero msg.value");
-
-    // @note can possible trigger reentrant call to this contract or messenger,
-    // but it seems not a big problem.
-    IERC20(_l1Token).safeTransfer(_to, _amount);
-
-    // @todo forward `_data` to `_to` in the near future
-
-    emit FinalizeWithdrawERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @inheritdoc L1ERC20Gateway
-  function _deposit(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal virtual override nonReentrant {
-    require(_amount > 0, "deposit zero amount");
-
-    // 1. Extract real sender if this call is from L1GatewayRouter.
-    address _from = msg.sender;
-    if (router == msg.sender) {
-      (_from, _data) = abi.decode(_data, (address, bytes));
+        l2TokenImplementation = _l2TokenImplementation;
+        l2TokenFactory = _l2TokenFactory;
     }
 
-    // 2. Transfer token into this contract.
-    {
-      // common practice to handle fee on transfer token.
-      uint256 _before = IERC20(_token).balanceOf(address(this));
-      IERC20(_token).safeTransferFrom(_from, address(this), _amount);
-      uint256 _after = IERC20(_token).balanceOf(address(this));
-      // no unchecked here, since some weird token may return arbitrary balance.
-      _amount = _after - _before;
-      // ignore weird fee on transfer token
-      require(_amount > 0, "deposit zero amount");
+    /*************************
+     * Public View Functions *
+     *************************/
+
+    /// @inheritdoc IL1ERC20Gateway
+    function getL2ERC20Address(address _l1Token) public view override returns (address) {
+        // In StandardERC20Gateway, all corresponding l2 tokens are depoyed by Create2 with salt,
+        // we can calculate the l2 address directly.
+        bytes32 _salt = keccak256(abi.encodePacked(counterpart, keccak256(abi.encodePacked(_l1Token))));
+
+        return Clones.predictDeterministicAddress(l2TokenImplementation, _salt, l2TokenFactory);
     }
 
-    // 3. Generate message passed to L2StandardERC20Gateway.
-    address _l2Token = tokenMapping[_token];
-    bytes memory _l2Data = _data;
-    if (_l2Token == address(0)) {
-      // It is a new token, compute and store mapping in storage.
-      _l2Token = getL2ERC20Address(_token);
-      tokenMapping[_token] = _l2Token;
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-      // passing symbol/name/decimal in order to deploy in L2.
-      string memory _symbol = IERC20Metadata(_token).symbol();
-      string memory _name = IERC20Metadata(_token).name();
-      uint8 _decimals = IERC20Metadata(_token).decimals();
-      _l2Data = abi.encode(_data, abi.encode(_symbol, _name, _decimals));
+    /// @inheritdoc IL1ERC20Gateway
+    function finalizeWithdrawERC20(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable override onlyCallByCounterpart {
+        require(msg.value == 0, "nonzero msg.value");
+
+        // @note can possible trigger reentrant call to this contract or messenger,
+        // but it seems not a big problem.
+        IERC20(_l1Token).safeTransfer(_to, _amount);
+
+        // @todo forward `_data` to `_to` in the near future
+
+        emit FinalizeWithdrawERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
     }
-    bytes memory _message = abi.encodeWithSelector(
-      IL2ERC20Gateway.finalizeDepositERC20.selector,
-      _token,
-      _l2Token,
-      _from,
-      _to,
-      _amount,
-      _l2Data
-    );
 
-    // 4. Send message to L1ScrollMessenger.
-    IL1ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, 0, _message, _gasLimit);
+    /**********************
+     * Internal Functions *
+     **********************/
 
-    emit DepositERC20(_token, _l2Token, _from, _to, _amount, _data);
-  }
+    /// @inheritdoc L1ERC20Gateway
+    function _deposit(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal virtual override nonReentrant {
+        require(_amount > 0, "deposit zero amount");
+
+        // 1. Extract real sender if this call is from L1GatewayRouter.
+        address _from = msg.sender;
+        if (router == msg.sender) {
+            (_from, _data) = abi.decode(_data, (address, bytes));
+        }
+
+        // 2. Transfer token into this contract.
+        {
+            // common practice to handle fee on transfer token.
+            uint256 _before = IERC20(_token).balanceOf(address(this));
+            IERC20(_token).safeTransferFrom(_from, address(this), _amount);
+            uint256 _after = IERC20(_token).balanceOf(address(this));
+            // no unchecked here, since some weird token may return arbitrary balance.
+            _amount = _after - _before;
+            // ignore weird fee on transfer token
+            require(_amount > 0, "deposit zero amount");
+        }
+
+        // 3. Generate message passed to L2StandardERC20Gateway.
+        address _l2Token = tokenMapping[_token];
+        bytes memory _l2Data = _data;
+        if (_l2Token == address(0)) {
+            // It is a new token, compute and store mapping in storage.
+            _l2Token = getL2ERC20Address(_token);
+            tokenMapping[_token] = _l2Token;
+
+            // passing symbol/name/decimal in order to deploy in L2.
+            string memory _symbol = IERC20Metadata(_token).symbol();
+            string memory _name = IERC20Metadata(_token).name();
+            uint8 _decimals = IERC20Metadata(_token).decimals();
+            _l2Data = abi.encode(_data, abi.encode(_symbol, _name, _decimals));
+        }
+        bytes memory _message = abi.encodeWithSelector(
+            IL2ERC20Gateway.finalizeDepositERC20.selector,
+            _token,
+            _l2Token,
+            _from,
+            _to,
+            _amount,
+            _l2Data
+        );
+
+        // 4. Send message to L1ScrollMessenger.
+        IL1ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit DepositERC20(_token, _l2Token, _from, _to, _amount, _data);
+    }
 }

contracts/src/L1/gateways/L1WETHGateway.sol

@@ -2,17 +2,17 @@
 
 pragma solidity ^0.8.0;
 
-import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
-import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
-import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
+import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 
-import { IWETH } from "../../interfaces/IWETH.sol";
-import { IL2ERC20Gateway } from "../../L2/gateways/IL2ERC20Gateway.sol";
-import { IL1ScrollMessenger } from "../IL1ScrollMessenger.sol";
-import { IL1ERC20Gateway } from "./IL1ERC20Gateway.sol";
+import {IWETH} from "../../interfaces/IWETH.sol";
+import {IL2ERC20Gateway} from "../../L2/gateways/IL2ERC20Gateway.sol";
+import {IL1ScrollMessenger} from "../IL1ScrollMessenger.sol";
+import {IL1ERC20Gateway} from "./IL1ERC20Gateway.sol";
 
-import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol";
-import { L1ERC20Gateway } from "./L1ERC20Gateway.sol";
+import {ScrollGatewayBase} from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {L1ERC20Gateway} from "./L1ERC20Gateway.sol";
 
 /// @title L1WETHGateway
 /// @notice The `L1WETHGateway` contract is used to deposit `WETH` token in layer 1 and
@@ -22,118 +22,123 @@ import { L1ERC20Gateway } from "./L1ERC20Gateway.sol";
 /// On finalizing withdraw, the Ether will be transfered from `L1ScrollMessenger`, then
 /// wrapped as WETH and finally transfer to recipient.
 contract L1WETHGateway is Initializable, ScrollGatewayBase, L1ERC20Gateway {
-  using SafeERC20 for IERC20;
+    using SafeERC20 for IERC20;
 
-  /*************
-   * Constants *
-   *************/
+    /*************
+     * Constants *
+     *************/
 
-  /// @notice The address of L2 WETH address.
-  address public immutable l2WETH;
+    /// @notice The address of L2 WETH address.
+    address public immutable l2WETH;
 
-  /// @notice The address of L1 WETH address.
-  // solhint-disable-next-line var-name-mixedcase
-  address public immutable WETH;
+    /// @notice The address of L1 WETH address.
+    // solhint-disable-next-line var-name-mixedcase
+    address public immutable WETH;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  constructor(address _WETH, address _l2WETH) {
-    WETH = _WETH;
-    l2WETH = _l2WETH;
-  }
-
-  /// @notice Initialize the storage of L1WETHGateway.
-  /// @param _counterpart The address of L2ETHGateway in L2.
-  /// @param _router The address of L1GatewayRouter.
-  /// @param _messenger The address of L1ScrollMessenger.
-  function initialize(
-    address _counterpart,
-    address _router,
-    address _messenger
-  ) external initializer {
-    require(_router != address(0), "zero router address");
-    ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
-  }
-
-  receive() external payable {
-    require(msg.sender == WETH, "only WETH");
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL1ERC20Gateway
-  function getL2ERC20Address(address) public view override returns (address) {
-    return l2WETH;
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL1ERC20Gateway
-  function finalizeWithdrawERC20(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable override onlyCallByCounterpart {
-    require(_l1Token == WETH, "l1 token not WETH");
-    require(_l2Token == l2WETH, "l2 token not WETH");
-    require(_amount == msg.value, "msg.value mismatch");
-
-    IWETH(_l1Token).deposit{ value: _amount }();
-    IERC20(_l1Token).safeTransfer(_to, _amount);
-
-    // @todo forward `_data` to `_to`.
-
-    emit FinalizeWithdrawERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @inheritdoc L1ERC20Gateway
-  function _deposit(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal virtual override nonReentrant {
-    require(_amount > 0, "deposit zero amount");
-    require(_token == WETH, "only WETH is allowed");
-
-    // 1. Extract real sender if this call is from L1GatewayRouter.
-    address _from = msg.sender;
-    if (router == msg.sender) {
-      (_from, _data) = abi.decode(_data, (address, bytes));
+    constructor(address _WETH, address _l2WETH) {
+        WETH = _WETH;
+        l2WETH = _l2WETH;
     }
 
-    // 2. Transfer token into this contract.
-    IERC20(_token).safeTransferFrom(_from, address(this), _amount);
-    IWETH(_token).withdraw(_amount);
+    /// @notice Initialize the storage of L1WETHGateway.
+    /// @param _counterpart The address of L2ETHGateway in L2.
+    /// @param _router The address of L1GatewayRouter.
+    /// @param _messenger The address of L1ScrollMessenger.
+    function initialize(
+        address _counterpart,
+        address _router,
+        address _messenger
+    ) external initializer {
+        require(_router != address(0), "zero router address");
+        ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
+    }
 
-    // 3. Generate message passed to L2StandardERC20Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL2ERC20Gateway.finalizeDepositERC20.selector,
-      _token,
-      l2WETH,
-      _from,
-      _to,
-      _amount,
-      _data
-    );
+    receive() external payable {
+        require(msg.sender == WETH, "only WETH");
+    }
 
-    // 4. Send message to L1ScrollMessenger.
-    IL1ScrollMessenger(messenger).sendMessage{ value: _amount + msg.value }(counterpart, _amount, _message, _gasLimit);
+    /*************************
+     * Public View Functions *
+     *************************/
 
-    emit DepositERC20(_token, l2WETH, _from, _to, _amount, _data);
-  }
+    /// @inheritdoc IL1ERC20Gateway
+    function getL2ERC20Address(address) public view override returns (address) {
+        return l2WETH;
+    }
+
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
+
+    /// @inheritdoc IL1ERC20Gateway
+    function finalizeWithdrawERC20(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable override onlyCallByCounterpart {
+        require(_l1Token == WETH, "l1 token not WETH");
+        require(_l2Token == l2WETH, "l2 token not WETH");
+        require(_amount == msg.value, "msg.value mismatch");
+
+        IWETH(_l1Token).deposit{value: _amount}();
+        IERC20(_l1Token).safeTransfer(_to, _amount);
+
+        // @todo forward `_data` to `_to`.
+
+        emit FinalizeWithdrawERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @inheritdoc L1ERC20Gateway
+    function _deposit(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal virtual override nonReentrant {
+        require(_amount > 0, "deposit zero amount");
+        require(_token == WETH, "only WETH is allowed");
+
+        // 1. Extract real sender if this call is from L1GatewayRouter.
+        address _from = msg.sender;
+        if (router == msg.sender) {
+            (_from, _data) = abi.decode(_data, (address, bytes));
+        }
+
+        // 2. Transfer token into this contract.
+        IERC20(_token).safeTransferFrom(_from, address(this), _amount);
+        IWETH(_token).withdraw(_amount);
+
+        // 3. Generate message passed to L2StandardERC20Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL2ERC20Gateway.finalizeDepositERC20.selector,
+            _token,
+            l2WETH,
+            _from,
+            _to,
+            _amount,
+            _data
+        );
+
+        // 4. Send message to L1ScrollMessenger.
+        IL1ScrollMessenger(messenger).sendMessage{value: _amount + msg.value}(
+            counterpart,
+            _amount,
+            _message,
+            _gasLimit
+        );
+
+        emit DepositERC20(_token, l2WETH, _from, _to, _amount, _data);
+    }
 }

contracts/src/L1/rollup/IL1MessageQueue.sol

@@ -3,76 +3,76 @@
 pragma solidity ^0.8.0;
 
 interface IL1MessageQueue {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when a new L1 => L2 transaction is appended to the queue.
-  /// @param sender The address of account who initiates the transaction.
-  /// @param target The address of account who will recieve the transaction.
-  /// @param value The value passed with the transaction.
-  /// @param queueIndex The index of this transaction in the queue.
-  /// @param gasLimit Gas limit required to complete the message relay on L2.
-  /// @param data The calldata of the transaction.
-  event QueueTransaction(
-    address indexed sender,
-    address indexed target,
-    uint256 value,
-    uint256 queueIndex,
-    uint256 gasLimit,
-    bytes data
-  );
+    /// @notice Emitted when a new L1 => L2 transaction is appended to the queue.
+    /// @param sender The address of account who initiates the transaction.
+    /// @param target The address of account who will recieve the transaction.
+    /// @param value The value passed with the transaction.
+    /// @param queueIndex The index of this transaction in the queue.
+    /// @param gasLimit Gas limit required to complete the message relay on L2.
+    /// @param data The calldata of the transaction.
+    event QueueTransaction(
+        address indexed sender,
+        address indexed target,
+        uint256 value,
+        uint256 queueIndex,
+        uint256 gasLimit,
+        bytes data
+    );
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Return the index of next appended message.
-  /// @dev Also the total number of appended messages.
-  function nextCrossDomainMessageIndex() external view returns (uint256);
+    /// @notice Return the index of next appended message.
+    /// @dev Also the total number of appended messages.
+    function nextCrossDomainMessageIndex() external view returns (uint256);
 
-  /// @notice Return the message of in `queueIndex`.
-  /// @param queueIndex The index to query.
-  function getCrossDomainMessage(uint256 queueIndex) external view returns (bytes32);
+    /// @notice Return the message of in `queueIndex`.
+    /// @param queueIndex The index to query.
+    function getCrossDomainMessage(uint256 queueIndex) external view returns (bytes32);
 
-  /// @notice Return the amount of ETH should pay for cross domain message.
-  /// @param sender The address of account who initiates the message in L1.
-  /// @param target The address of account who will recieve the message in L2.
-  /// @param message The content of the message.
-  /// @param gasLimit Gas limit required to complete the message relay on L2.
-  function estimateCrossDomainMessageFee(
-    address sender,
-    address target,
-    bytes memory message,
-    uint256 gasLimit
-  ) external view returns (uint256);
+    /// @notice Return the amount of ETH should pay for cross domain message.
+    /// @param sender The address of account who initiates the message in L1.
+    /// @param target The address of account who will recieve the message in L2.
+    /// @param message The content of the message.
+    /// @param gasLimit Gas limit required to complete the message relay on L2.
+    function estimateCrossDomainMessageFee(
+        address sender,
+        address target,
+        bytes memory message,
+        uint256 gasLimit
+    ) external view returns (uint256);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Append a L1 to L2 message into this contract.
-  /// @param target The address of target contract to call in L2.
-  /// @param gasLimit The maximum gas should be used for relay this message in L2.
-  /// @param data The calldata passed to target contract.
-  function appendCrossDomainMessage(
-    address target,
-    uint256 gasLimit,
-    bytes calldata data
-  ) external;
+    /// @notice Append a L1 to L2 message into this contract.
+    /// @param target The address of target contract to call in L2.
+    /// @param gasLimit The maximum gas should be used for relay this message in L2.
+    /// @param data The calldata passed to target contract.
+    function appendCrossDomainMessage(
+        address target,
+        uint256 gasLimit,
+        bytes calldata data
+    ) external;
 
-  /// @notice Append an enforced transaction to this contract.
-  /// @dev The address of sender should be an EOA.
-  /// @param sender The address of sender who will initiate this transaction in L2.
-  /// @param target The address of target contract to call in L2.
-  /// @param value The value passed
-  /// @param gasLimit The maximum gas should be used for this transaction in L2.
-  /// @param data The calldata passed to target contract.
-  function appendEnforcedTransaction(
-    address sender,
-    address target,
-    uint256 value,
-    uint256 gasLimit,
-    bytes calldata data
-  ) external;
+    /// @notice Append an enforced transaction to this contract.
+    /// @dev The address of sender should be an EOA.
+    /// @param sender The address of sender who will initiate this transaction in L2.
+    /// @param target The address of target contract to call in L2.
+    /// @param value The value passed
+    /// @param gasLimit The maximum gas should be used for this transaction in L2.
+    /// @param data The calldata passed to target contract.
+    function appendEnforcedTransaction(
+        address sender,
+        address target,
+        uint256 value,
+        uint256 gasLimit,
+        bytes calldata data
+    ) external;
 }

contracts/src/L1/rollup/IL2GasPriceOracle.sol

@@ -3,14 +3,14 @@
 pragma solidity ^0.8.0;
 
 interface IL2GasPriceOracle {
-  /// @notice Estimate fee for cross chain message call.
-  /// @param _sender The address of sender who invoke the call.
-  /// @param _to The target address to receive the call.
-  /// @param _message The message will be passed to the target address.
-  function estimateCrossDomainMessageFee(
-    address _sender,
-    address _to,
-    bytes memory _message,
-    uint256 _gasLimit
-  ) external view returns (uint256);
+    /// @notice Estimate fee for cross chain message call.
+    /// @param _sender The address of sender who invoke the call.
+    /// @param _to The target address to receive the call.
+    /// @param _message The message will be passed to the target address.
+    function estimateCrossDomainMessageFee(
+        address _sender,
+        address _to,
+        bytes memory _message,
+        uint256 _gasLimit
+    ) external view returns (uint256);
 }

contracts/src/L1/rollup/IScrollChain.sol

@@ -3,102 +3,102 @@
 pragma solidity ^0.8.0;
 
 interface IScrollChain {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when a new batch is commited.
-  /// @param batchHash The hash of the batch
-  event CommitBatch(bytes32 indexed batchHash);
+    /// @notice Emitted when a new batch is commited.
+    /// @param batchHash The hash of the batch
+    event CommitBatch(bytes32 indexed batchHash);
 
-  /// @notice Emitted when a batch is reverted.
-  /// @param batchHash The identification of the batch.
-  event RevertBatch(bytes32 indexed batchHash);
+    /// @notice Emitted when a batch is reverted.
+    /// @param batchHash The identification of the batch.
+    event RevertBatch(bytes32 indexed batchHash);
 
-  /// @notice Emitted when a batch is finalized.
-  /// @param batchHash The hash of the batch
-  event FinalizeBatch(bytes32 indexed batchHash);
+    /// @notice Emitted when a batch is finalized.
+    /// @param batchHash The hash of the batch
+    event FinalizeBatch(bytes32 indexed batchHash);
 
-  /***********
-   * Structs *
-   ***********/
+    /***********
+     * Structs *
+     ***********/
 
-  struct BlockContext {
-    // The hash of this block.
-    bytes32 blockHash;
-    // The parent hash of this block.
-    bytes32 parentHash;
-    // The height of this block.
-    uint64 blockNumber;
-    // The timestamp of this block.
-    uint64 timestamp;
-    // The base fee of this block.
-    // Currently, it is not used, because we disable EIP-1559.
-    // We keep it for future proof.
-    uint256 baseFee;
-    // The gas limit of this block.
-    uint64 gasLimit;
-    // The number of transactions in this block, both L1 & L2 txs.
-    uint16 numTransactions;
-    // The number of l1 messages in this block.
-    uint16 numL1Messages;
-  }
+    struct BlockContext {
+        // The hash of this block.
+        bytes32 blockHash;
+        // The parent hash of this block.
+        bytes32 parentHash;
+        // The height of this block.
+        uint64 blockNumber;
+        // The timestamp of this block.
+        uint64 timestamp;
+        // The base fee of this block.
+        // Currently, it is not used, because we disable EIP-1559.
+        // We keep it for future proof.
+        uint256 baseFee;
+        // The gas limit of this block.
+        uint64 gasLimit;
+        // The number of transactions in this block, both L1 & L2 txs.
+        uint16 numTransactions;
+        // The number of l1 messages in this block.
+        uint16 numL1Messages;
+    }
 
-  struct Batch {
-    // The list of blocks in this batch
-    BlockContext[] blocks; // MAX_NUM_BLOCKS = 100, about 5 min
-    // The state root of previous batch.
-    // The first batch will use 0x0 for prevStateRoot
-    bytes32 prevStateRoot;
-    // The state root of the last block in this batch.
-    bytes32 newStateRoot;
-    // The withdraw trie root of the last block in this batch.
-    bytes32 withdrawTrieRoot;
-    // The index of the batch.
-    uint64 batchIndex;
-    // The parent batch hash.
-    bytes32 parentBatchHash;
-    // Concatenated raw data of RLP encoded L2 txs
-    bytes l2Transactions;
-  }
+    struct Batch {
+        // The list of blocks in this batch
+        BlockContext[] blocks; // MAX_NUM_BLOCKS = 100, about 5 min
+        // The state root of previous batch.
+        // The first batch will use 0x0 for prevStateRoot
+        bytes32 prevStateRoot;
+        // The state root of the last block in this batch.
+        bytes32 newStateRoot;
+        // The withdraw trie root of the last block in this batch.
+        bytes32 withdrawTrieRoot;
+        // The index of the batch.
+        uint64 batchIndex;
+        // The parent batch hash.
+        bytes32 parentBatchHash;
+        // Concatenated raw data of RLP encoded L2 txs
+        bytes l2Transactions;
+    }
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Return whether the batch is finalized by batch hash.
-  /// @param batchHash The hash of the batch to query.
-  function isBatchFinalized(bytes32 batchHash) external view returns (bool);
+    /// @notice Return whether the batch is finalized by batch hash.
+    /// @param batchHash The hash of the batch to query.
+    function isBatchFinalized(bytes32 batchHash) external view returns (bool);
 
-  /// @notice Return the merkle root of L2 message tree.
-  /// @param batchHash The hash of the batch to query.
-  function getL2MessageRoot(bytes32 batchHash) external view returns (bytes32);
+    /// @notice Return the merkle root of L2 message tree.
+    /// @param batchHash The hash of the batch to query.
+    function getL2MessageRoot(bytes32 batchHash) external view returns (bytes32);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice commit a batch in layer 1
-  /// @param batch The layer2 batch to commit.
-  function commitBatch(Batch memory batch) external;
+    /// @notice commit a batch in layer 1
+    /// @param batch The layer2 batch to commit.
+    function commitBatch(Batch memory batch) external;
 
-  /// @notice commit a list of batches in layer 1
-  /// @param batches The list of layer2 batches to commit.
-  function commitBatches(Batch[] memory batches) external;
+    /// @notice commit a list of batches in layer 1
+    /// @param batches The list of layer2 batches to commit.
+    function commitBatches(Batch[] memory batches) external;
 
-  /// @notice revert a pending batch.
-  /// @dev one can only revert unfinalized batches.
-  /// @param batchId The identification of the batch.
-  function revertBatch(bytes32 batchId) external;
+    /// @notice revert a pending batch.
+    /// @dev one can only revert unfinalized batches.
+    /// @param batchId The identification of the batch.
+    function revertBatch(bytes32 batchId) external;
 
-  /// @notice finalize commited batch in layer 1
-  /// @dev will add more parameters if needed.
-  /// @param batchId The identification of the commited batch.
-  /// @param proof The corresponding proof of the commited batch.
-  /// @param instances Instance used to verify, generated from batch.
-  function finalizeBatchWithProof(
-    bytes32 batchId,
-    uint256[] memory proof,
-    uint256[] memory instances
-  ) external;
+    /// @notice finalize commited batch in layer 1
+    /// @dev will add more parameters if needed.
+    /// @param batchId The identification of the commited batch.
+    /// @param proof The corresponding proof of the commited batch.
+    /// @param instances Instance used to verify, generated from batch.
+    function finalizeBatchWithProof(
+        bytes32 batchId,
+        uint256[] memory proof,
+        uint256[] memory instances
+    ) external;
 }

contracts/src/L1/rollup/L1MessageQueue.sol

@@ -2,122 +2,122 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
 
-import { IL2GasPriceOracle } from "./IL2GasPriceOracle.sol";
-import { IL1MessageQueue } from "./IL1MessageQueue.sol";
+import {IL2GasPriceOracle} from "./IL2GasPriceOracle.sol";
+import {IL1MessageQueue} from "./IL1MessageQueue.sol";
 
-import { AddressAliasHelper } from "../../libraries/common/AddressAliasHelper.sol";
+import {AddressAliasHelper} from "../../libraries/common/AddressAliasHelper.sol";
 
 /// @title L1MessageQueue
 /// @notice This contract will hold all L1 to L2 messages.
 /// Each appended message is assigned with a unique and increasing `uint256` index denoting the message nonce.
 contract L1MessageQueue is OwnableUpgradeable, IL1MessageQueue {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when owner updates gas oracle contract.
-  /// @param _oldGasOracle The address of old gas oracle contract.
-  /// @param _newGasOracle The address of new gas oracle contract.
-  event UpdateGasOracle(address _oldGasOracle, address _newGasOracle);
+    /// @notice Emitted when owner updates gas oracle contract.
+    /// @param _oldGasOracle The address of old gas oracle contract.
+    /// @param _newGasOracle The address of new gas oracle contract.
+    event UpdateGasOracle(address _oldGasOracle, address _newGasOracle);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice The address of L1ScrollMessenger contract.
-  address public messenger;
+    /// @notice The address of L1ScrollMessenger contract.
+    address public messenger;
 
-  /// @notice The address of GasOracle contract.
-  address public gasOracle;
+    /// @notice The address of GasOracle contract.
+    address public gasOracle;
 
-  /// @notice The list of queued cross domain messages.
-  bytes32[] public messageQueue;
+    /// @notice The list of queued cross domain messages.
+    bytes32[] public messageQueue;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  function initialize(address _messenger, address _gasOracle) external initializer {
-    OwnableUpgradeable.__Ownable_init();
+    function initialize(address _messenger, address _gasOracle) external initializer {
+        OwnableUpgradeable.__Ownable_init();
 
-    messenger = _messenger;
-    gasOracle = _gasOracle;
-  }
+        messenger = _messenger;
+        gasOracle = _gasOracle;
+    }
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @inheritdoc IL1MessageQueue
-  function nextCrossDomainMessageIndex() external view returns (uint256) {
-    return messageQueue.length;
-  }
+    /// @inheritdoc IL1MessageQueue
+    function nextCrossDomainMessageIndex() external view returns (uint256) {
+        return messageQueue.length;
+    }
 
-  /// @inheritdoc IL1MessageQueue
-  function getCrossDomainMessage(uint256 _queueIndex) external view returns (bytes32) {
-    return messageQueue[_queueIndex];
-  }
+    /// @inheritdoc IL1MessageQueue
+    function getCrossDomainMessage(uint256 _queueIndex) external view returns (bytes32) {
+        return messageQueue[_queueIndex];
+    }
 
-  /// @inheritdoc IL1MessageQueue
-  function estimateCrossDomainMessageFee(
-    address _sender,
-    address _target,
-    bytes memory _message,
-    uint256 _gasLimit
-  ) external view override returns (uint256) {
-    address _oracle = gasOracle;
-    if (_oracle == address(0)) return 0;
-    return IL2GasPriceOracle(_oracle).estimateCrossDomainMessageFee(_sender, _target, _message, _gasLimit);
-  }
+    /// @inheritdoc IL1MessageQueue
+    function estimateCrossDomainMessageFee(
+        address _sender,
+        address _target,
+        bytes memory _message,
+        uint256 _gasLimit
+    ) external view override returns (uint256) {
+        address _oracle = gasOracle;
+        if (_oracle == address(0)) return 0;
+        return IL2GasPriceOracle(_oracle).estimateCrossDomainMessageFee(_sender, _target, _message, _gasLimit);
+    }
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @inheritdoc IL1MessageQueue
-  function appendCrossDomainMessage(
-    address _target,
-    uint256 _gasLimit,
-    bytes calldata _data
-  ) external override {
-    require(msg.sender == messenger, "Only callable by the L1ScrollMessenger");
+    /// @inheritdoc IL1MessageQueue
+    function appendCrossDomainMessage(
+        address _target,
+        uint256 _gasLimit,
+        bytes calldata _data
+    ) external override {
+        require(msg.sender == messenger, "Only callable by the L1ScrollMessenger");
 
-    // do address alias to avoid replay attack in L2.
-    address _sender = AddressAliasHelper.applyL1ToL2Alias(msg.sender);
+        // do address alias to avoid replay attack in L2.
+        address _sender = AddressAliasHelper.applyL1ToL2Alias(msg.sender);
 
-    // @todo Change it to rlp encoding later.
-    bytes32 _hash = keccak256(abi.encode(_sender, _target, 0, _gasLimit, _data));
+        // @todo Change it to rlp encoding later.
+        bytes32 _hash = keccak256(abi.encode(_sender, _target, 0, _gasLimit, _data));
 
-    uint256 _queueIndex = messageQueue.length;
-    emit QueueTransaction(_sender, _target, 0, _queueIndex, _gasLimit, _data);
+        uint256 _queueIndex = messageQueue.length;
+        emit QueueTransaction(_sender, _target, 0, _queueIndex, _gasLimit, _data);
 
-    messageQueue.push(_hash);
-  }
+        messageQueue.push(_hash);
+    }
 
-  /// @inheritdoc IL1MessageQueue
-  function appendEnforcedTransaction(
-    address,
-    address,
-    uint256,
-    uint256,
-    bytes calldata
-  ) external override {
-    // @todo
-  }
+    /// @inheritdoc IL1MessageQueue
+    function appendEnforcedTransaction(
+        address,
+        address,
+        uint256,
+        uint256,
+        bytes calldata
+    ) external override {
+        // @todo
+    }
 
-  /************************
-   * Restricted Functions *
-   ************************/
+    /************************
+     * Restricted Functions *
+     ************************/
 
-  /// @notice Update the address of gas oracle.
-  /// @dev This function can only called by contract owner.
-  /// @param _newGasOracle The address to update.
-  function updateGasOracle(address _newGasOracle) external onlyOwner {
-    address _oldGasOracle = gasOracle;
-    gasOracle = _newGasOracle;
+    /// @notice Update the address of gas oracle.
+    /// @dev This function can only called by contract owner.
+    /// @param _newGasOracle The address to update.
+    function updateGasOracle(address _newGasOracle) external onlyOwner {
+        address _oldGasOracle = gasOracle;
+        gasOracle = _newGasOracle;
 
-    emit UpdateGasOracle(_oldGasOracle, _newGasOracle);
-  }
+        emit UpdateGasOracle(_oldGasOracle, _newGasOracle);
+    }
 }

contracts/src/L1/rollup/L2GasPriceOracle.sol

@@ -2,162 +2,162 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
 
-import { IWhitelist } from "../../libraries/common/IWhitelist.sol";
+import {IWhitelist} from "../../libraries/common/IWhitelist.sol";
 
-import { IL2GasPriceOracle } from "./IL2GasPriceOracle.sol";
+import {IL2GasPriceOracle} from "./IL2GasPriceOracle.sol";
 
 contract L2GasPriceOracle is OwnableUpgradeable, IL2GasPriceOracle {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when owner updates whitelist contract.
-  /// @param _oldWhitelist The address of old whitelist contract.
-  /// @param _newWhitelist The address of new whitelist contract.
-  event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);
+    /// @notice Emitted when owner updates whitelist contract.
+    /// @param _oldWhitelist The address of old whitelist contract.
+    /// @param _newWhitelist The address of new whitelist contract.
+    event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);
 
-  /// @notice Emitted when current fee overhead is updated.
-  /// @param overhead The current fee overhead updated.
-  event OverheadUpdated(uint256 overhead);
+    /// @notice Emitted when current fee overhead is updated.
+    /// @param overhead The current fee overhead updated.
+    event OverheadUpdated(uint256 overhead);
 
-  /// @notice Emitted when current fee scalar is updated.
-  /// @param scalar The current fee scalar updated.
-  event ScalarUpdated(uint256 scalar);
+    /// @notice Emitted when current fee scalar is updated.
+    /// @param scalar The current fee scalar updated.
+    event ScalarUpdated(uint256 scalar);
 
-  /// @notice Emitted when current l2 base fee is updated.
-  /// @param l2BaseFee The current l2 base fee updated.
-  event L2BaseFeeUpdated(uint256 l2BaseFee);
+    /// @notice Emitted when current l2 base fee is updated.
+    /// @param l2BaseFee The current l2 base fee updated.
+    event L2BaseFeeUpdated(uint256 l2BaseFee);
 
-  /*************
-   * Constants *
-   *************/
+    /*************
+     * Constants *
+     *************/
 
-  /// @dev The precision used in the scalar.
-  uint256 private constant PRECISION = 1e9;
+    /// @dev The precision used in the scalar.
+    uint256 private constant PRECISION = 1e9;
 
-  /// @dev The maximum possible l1 fee overhead.
-  ///      Computed based on current l1 block gas limit.
-  uint256 private constant MAX_OVERHEAD = 30000000 / 16;
+    /// @dev The maximum possible l1 fee overhead.
+    ///      Computed based on current l1 block gas limit.
+    uint256 private constant MAX_OVERHEAD = 30000000 / 16;
 
-  /// @dev The maximum possible l1 fee scale.
-  ///      x1000 should be enough.
-  uint256 private constant MAX_SCALE = 1000 * PRECISION;
+    /// @dev The maximum possible l1 fee scale.
+    ///      x1000 should be enough.
+    uint256 private constant MAX_SCALE = 1000 * PRECISION;
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice The current l1 fee overhead.
-  uint256 public overhead;
+    /// @notice The current l1 fee overhead.
+    uint256 public overhead;
 
-  /// @notice The current l1 fee scalar.
-  uint256 public scalar;
+    /// @notice The current l1 fee scalar.
+    uint256 public scalar;
 
-  /// @notice The latest known l2 base fee.
-  uint256 public l2BaseFee;
+    /// @notice The latest known l2 base fee.
+    uint256 public l2BaseFee;
 
-  /// @notice The address of whitelist contract.
-  IWhitelist public whitelist;
+    /// @notice The address of whitelist contract.
+    IWhitelist public whitelist;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  function initialize() external initializer {
-    OwnableUpgradeable.__Ownable_init();
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @notice Return the current l1 base fee.
-  function l1BaseFee() public view returns (uint256) {
-    return block.basefee;
-  }
-
-  /// @inheritdoc IL2GasPriceOracle
-  function estimateCrossDomainMessageFee(
-    address,
-    address,
-    bytes memory _message,
-    uint256 _gasLimit
-  ) external view override returns (uint256) {
-    unchecked {
-      uint256 _l1GasUsed = getL1GasUsed(_message);
-      uint256 _rollupFee = (_l1GasUsed * l1BaseFee() * scalar) / PRECISION;
-      uint256 _l2Fee = _gasLimit * l2BaseFee;
-      return _l2Fee + _rollupFee;
+    function initialize() external initializer {
+        OwnableUpgradeable.__Ownable_init();
     }
-  }
 
-  /// @notice Computes the amount of L1 gas used for a transaction. Adds the overhead which
-  ///         represents the per-transaction gas overhead of posting the transaction and state
-  ///         roots to L1. Adds 68 bytes of padding to account for the fact that the input does
-  ///         not have a signature.
-  /// @param _data Unsigned fully RLP-encoded transaction to get the L1 gas for.
-  /// @return Amount of L1 gas used to publish the transaction.
-  function getL1GasUsed(bytes memory _data) public view returns (uint256) {
-    uint256 _total = 0;
-    uint256 _length = _data.length;
-    unchecked {
-      for (uint256 i = 0; i < _length; i++) {
-        if (_data[i] == 0) {
-          _total += 4;
-        } else {
-          _total += 16;
+    /*************************
+     * Public View Functions *
+     *************************/
+
+    /// @notice Return the current l1 base fee.
+    function l1BaseFee() public view returns (uint256) {
+        return block.basefee;
+    }
+
+    /// @inheritdoc IL2GasPriceOracle
+    function estimateCrossDomainMessageFee(
+        address,
+        address,
+        bytes memory _message,
+        uint256 _gasLimit
+    ) external view override returns (uint256) {
+        unchecked {
+            uint256 _l1GasUsed = getL1GasUsed(_message);
+            uint256 _rollupFee = (_l1GasUsed * l1BaseFee() * scalar) / PRECISION;
+            uint256 _l2Fee = _gasLimit * l2BaseFee;
+            return _l2Fee + _rollupFee;
         }
-      }
-      uint256 _unsigned = _total + overhead;
-      return _unsigned + (68 * 16);
     }
-  }
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /// @notice Computes the amount of L1 gas used for a transaction. Adds the overhead which
+    ///         represents the per-transaction gas overhead of posting the transaction and state
+    ///         roots to L1. Adds 68 bytes of padding to account for the fact that the input does
+    ///         not have a signature.
+    /// @param _data Unsigned fully RLP-encoded transaction to get the L1 gas for.
+    /// @return Amount of L1 gas used to publish the transaction.
+    function getL1GasUsed(bytes memory _data) public view returns (uint256) {
+        uint256 _total = 0;
+        uint256 _length = _data.length;
+        unchecked {
+            for (uint256 i = 0; i < _length; i++) {
+                if (_data[i] == 0) {
+                    _total += 4;
+                } else {
+                    _total += 16;
+                }
+            }
+            uint256 _unsigned = _total + overhead;
+            return _unsigned + (68 * 16);
+        }
+    }
 
-  /// @notice Allows the owner to modify the l2 base fee.
-  /// @param _l2BaseFee The new l2 base fee.
-  function setL2BaseFee(uint256 _l2BaseFee) external {
-    require(whitelist.isSenderAllowed(msg.sender), "Not whitelisted sender");
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-    l2BaseFee = _l2BaseFee;
+    /// @notice Allows the owner to modify the l2 base fee.
+    /// @param _l2BaseFee The new l2 base fee.
+    function setL2BaseFee(uint256 _l2BaseFee) external {
+        require(whitelist.isSenderAllowed(msg.sender), "Not whitelisted sender");
 
-    emit L2BaseFeeUpdated(_l2BaseFee);
-  }
+        l2BaseFee = _l2BaseFee;
 
-  /************************
-   * Restricted Functions *
-   ************************/
+        emit L2BaseFeeUpdated(_l2BaseFee);
+    }
 
-  /// @notice Allows the owner to modify the overhead.
-  /// @param _overhead New overhead
-  function setOverhead(uint256 _overhead) external onlyOwner {
-    require(_overhead <= MAX_OVERHEAD, "exceed maximum overhead");
+    /************************
+     * Restricted Functions *
+     ************************/
 
-    overhead = _overhead;
-    emit OverheadUpdated(_overhead);
-  }
+    /// @notice Allows the owner to modify the overhead.
+    /// @param _overhead New overhead
+    function setOverhead(uint256 _overhead) external onlyOwner {
+        require(_overhead <= MAX_OVERHEAD, "exceed maximum overhead");
 
-  /// Allows the owner to modify the scalar.
-  /// @param _scalar The new scalar
-  function setScalar(uint256 _scalar) external onlyOwner {
-    require(_scalar <= MAX_SCALE, "exceed maximum scale");
+        overhead = _overhead;
+        emit OverheadUpdated(_overhead);
+    }
 
-    scalar = _scalar;
-    emit ScalarUpdated(_scalar);
-  }
+    /// Allows the owner to modify the scalar.
+    /// @param _scalar The new scalar
+    function setScalar(uint256 _scalar) external onlyOwner {
+        require(_scalar <= MAX_SCALE, "exceed maximum scale");
 
-  /// @notice Update whitelist contract.
-  /// @dev This function can only called by contract owner.
-  /// @param _newWhitelist The address of new whitelist contract.
-  function updateWhitelist(address _newWhitelist) external onlyOwner {
-    address _oldWhitelist = address(whitelist);
+        scalar = _scalar;
+        emit ScalarUpdated(_scalar);
+    }
 
-    whitelist = IWhitelist(_newWhitelist);
-    emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
-  }
+    /// @notice Update whitelist contract.
+    /// @dev This function can only called by contract owner.
+    /// @param _newWhitelist The address of new whitelist contract.
+    function updateWhitelist(address _newWhitelist) external onlyOwner {
+        address _oldWhitelist = address(whitelist);
+
+        whitelist = IWhitelist(_newWhitelist);
+        emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
+    }
 }

contracts/src/L1/rollup/ScrollChain.sol

@@ -2,11 +2,11 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
 
-import { IL1MessageQueue } from "./IL1MessageQueue.sol";
-import { IScrollChain } from "./IScrollChain.sol";
-import { RollupVerifier } from "../../libraries/verifier/RollupVerifier.sol";
+import {IL1MessageQueue} from "./IL1MessageQueue.sol";
+import {IScrollChain} from "./IScrollChain.sol";
+import {RollupVerifier} from "../../libraries/verifier/RollupVerifier.sol";
 
 // solhint-disable reason-string
 
@@ -18,402 +18,405 @@ import { RollupVerifier } from "../../libraries/verifier/RollupVerifier.sol";
 ///
 /// @dev the message queue is not used yet, the offline relayer only use events in `L1ScrollMessenger`.
 contract ScrollChain is OwnableUpgradeable, IScrollChain {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when owner updates the status of sequencer.
-  /// @param account The address of account updated.
-  /// @param status The status of the account updated.
-  event UpdateSequencer(address indexed account, bool status);
+    /// @notice Emitted when owner updates the status of sequencer.
+    /// @param account The address of account updated.
+    /// @param status The status of the account updated.
+    event UpdateSequencer(address indexed account, bool status);
 
-  /*************
-   * Constants *
-   *************/
+    /*************
+     * Constants *
+     *************/
 
-  /// @dev The maximum number of transaction in on batch.
-  uint256 public immutable maxNumTxInBatch;
+    /// @dev The maximum number of transaction in on batch.
+    uint256 public immutable maxNumTxInBatch;
 
-  /// @dev The hash used for padding public inputs.
-  bytes32 public immutable paddingTxHash;
+    /// @dev The hash used for padding public inputs.
+    bytes32 public immutable paddingTxHash;
 
-  /// @notice The chain id of the corresponding layer 2 chain.
-  uint256 public immutable layer2ChainId;
+    /// @notice The chain id of the corresponding layer 2 chain.
+    uint256 public immutable layer2ChainId;
 
-  /***********
-   * Structs *
-   ***********/
+    /***********
+     * Structs *
+     ***********/
 
-  // subject to change
-  struct BatchStored {
-    // The state root of the last block in this batch.
-    bytes32 newStateRoot;
-    // The withdraw trie root of the last block in this batch.
-    bytes32 withdrawTrieRoot;
-    // The parent batch hash.
-    bytes32 parentBatchHash;
-    // The index of the batch.
-    uint64 batchIndex;
-    // The timestamp of the last block in this batch.
-    uint64 timestamp;
-    // The number of transactions in this batch, both L1 & L2 txs.
-    uint64 numTransactions;
-    // The total number of L1 messages included after this batch.
-    uint64 totalL1Messages;
-    // Whether the batch is finalized.
-    bool finalized;
-  }
-
-  /*************
-   * Variables *
-   *************/
-
-  /// @notice The address of L1MessageQueue.
-  address public messageQueue;
-
-  /// @notice Whether an account is a sequencer.
-  mapping(address => bool) public isSequencer;
-
-  /// @notice The latest finalized batch hash.
-  bytes32 public lastFinalizedBatchHash;
-
-  /// @notice Mapping from batch id to batch struct.
-  mapping(bytes32 => BatchStored) public batches;
-
-  /// @notice Mapping from batch index to finalized batch hash.
-  mapping(uint256 => bytes32) public finalizedBatches;
-
-  /**********************
-   * Function Modifiers *
-   **********************/
-
-  modifier OnlySequencer() {
-    // @todo In the decentralize mode, it should be only called by a list of validator.
-    require(isSequencer[msg.sender], "caller not sequencer");
-    _;
-  }
-
-  /***************
-   * Constructor *
-   ***************/
-
-  constructor(
-    uint256 _chainId,
-    uint256 _maxNumTxInBatch,
-    bytes32 _paddingTxHash
-  ) {
-    layer2ChainId = _chainId;
-    maxNumTxInBatch = _maxNumTxInBatch;
-    paddingTxHash = _paddingTxHash;
-  }
-
-  function initialize(address _messageQueue) public initializer {
-    OwnableUpgradeable.__Ownable_init();
-
-    messageQueue = _messageQueue;
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IScrollChain
-  function isBatchFinalized(bytes32 _batchHash) external view override returns (bool) {
-    BatchStored storage _batch = batches[_batchHash];
-    if (_batch.newStateRoot == bytes32(0)) {
-      return false;
-    }
-    return batches[lastFinalizedBatchHash].batchIndex >= _batch.batchIndex;
-  }
-
-  /// @inheritdoc IScrollChain
-  function getL2MessageRoot(bytes32 _batchHash) external view override returns (bytes32) {
-    return batches[_batchHash].withdrawTrieRoot;
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @notice Import layer 2 genesis block
-  function importGenesisBatch(Batch memory _genesisBatch) external {
-    require(lastFinalizedBatchHash == bytes32(0), "Genesis batch imported");
-    require(_genesisBatch.blocks.length == 1, "Not exact one block in genesis");
-    require(_genesisBatch.prevStateRoot == bytes32(0), "Nonzero prevStateRoot");
-
-    BlockContext memory _genesisBlock = _genesisBatch.blocks[0];
-
-    require(_genesisBlock.blockHash != bytes32(0), "Block hash is zero");
-    require(_genesisBlock.blockNumber == 0, "Block is not genesis");
-    require(_genesisBlock.parentHash == bytes32(0), "Parent hash not empty");
-
-    bytes32 _batchHash = _commitBatch(_genesisBatch);
-
-    lastFinalizedBatchHash = _batchHash;
-    finalizedBatches[0] = _batchHash;
-    batches[_batchHash].finalized = true;
-
-    emit FinalizeBatch(_batchHash);
-  }
-
-  /// @inheritdoc IScrollChain
-  function commitBatch(Batch memory _batch) public override OnlySequencer {
-    _commitBatch(_batch);
-  }
-
-  /// @inheritdoc IScrollChain
-  function commitBatches(Batch[] memory _batches) public override OnlySequencer {
-    for (uint256 i = 0; i < _batches.length; i++) {
-      _commitBatch(_batches[i]);
-    }
-  }
-
-  /// @inheritdoc IScrollChain
-  function revertBatch(bytes32 _batchHash) external override OnlySequencer {
-    BatchStored storage _batch = batches[_batchHash];
-
-    require(_batch.newStateRoot != bytes32(0), "No such batch");
-    require(!_batch.finalized, "Unable to revert finalized batch");
-
-    // delete committed batch
-    delete batches[_batchHash];
-
-    emit RevertBatch(_batchHash);
-  }
-
-  /// @inheritdoc IScrollChain
-  function finalizeBatchWithProof(
-    bytes32 _batchHash,
-    uint256[] memory _proof,
-    uint256[] memory _instances
-  ) external override OnlySequencer {
-    BatchStored storage _batch = batches[_batchHash];
-    require(_batch.newStateRoot != bytes32(0), "No such batch");
-    require(!_batch.finalized, "Batch is already finalized");
-
-    // @note skip parent check for now, since we may not prove blocks in order.
-    // bytes32 _parentHash = _block.header.parentHash;
-    // require(lastFinalizedBlockHash == _parentHash, "parent not latest finalized");
-    // this check below is not needed, just incase
-    // require(blocks[_parentHash].verified, "parent not verified");
-
-    // @todo add verification logic
-    RollupVerifier.verify(_proof, _instances);
-
-    uint256 _batchIndex = _batch.batchIndex;
-    finalizedBatches[_batchIndex] = _batchHash;
-    _batch.finalized = true;
-
-    BatchStored storage _finalizedBatch = batches[lastFinalizedBatchHash];
-    if (_batchIndex > _finalizedBatch.batchIndex) {
-      lastFinalizedBatchHash = _batchHash;
+    // subject to change
+    struct BatchStored {
+        // The state root of the last block in this batch.
+        bytes32 newStateRoot;
+        // The withdraw trie root of the last block in this batch.
+        bytes32 withdrawTrieRoot;
+        // The parent batch hash.
+        bytes32 parentBatchHash;
+        // The index of the batch.
+        uint64 batchIndex;
+        // The timestamp of the last block in this batch.
+        uint64 timestamp;
+        // The number of transactions in this batch, both L1 & L2 txs.
+        uint64 numTransactions;
+        // The total number of L1 messages included after this batch.
+        uint64 totalL1Messages;
+        // Whether the batch is finalized.
+        bool finalized;
     }
 
-    emit FinalizeBatch(_batchHash);
-  }
+    /*************
+     * Variables *
+     *************/
 
-  /************************
-   * Restricted Functions *
-   ************************/
+    /// @notice The address of L1MessageQueue.
+    address public messageQueue;
 
-  /// @notice Update the status of sequencer.
-  /// @dev This function can only called by contract owner.
-  /// @param _account The address of account to update.
-  /// @param _status The status of the account to update.
-  function updateSequencer(address _account, bool _status) external onlyOwner {
-    isSequencer[_account] = _status;
+    /// @notice Whether an account is a sequencer.
+    mapping(address => bool) public isSequencer;
 
-    emit UpdateSequencer(_account, _status);
-  }
+    /// @notice The latest finalized batch hash.
+    bytes32 public lastFinalizedBatchHash;
 
-  /**********************
-   * Internal Functions *
-   **********************/
+    /// @notice Mapping from batch id to batch struct.
+    mapping(bytes32 => BatchStored) public batches;
 
-  /// @dev Internal function to commit a batch.
-  /// @param _batch The batch to commit.
-  function _commitBatch(Batch memory _batch) internal returns (bytes32) {
-    // check whether the batch is empty
-    require(_batch.blocks.length > 0, "Batch is empty");
+    /// @notice Mapping from batch index to finalized batch hash.
+    mapping(uint256 => bytes32) public finalizedBatches;
 
-    BatchStored storage _parentBatch = batches[_batch.parentBatchHash];
-    require(_parentBatch.newStateRoot == _batch.prevStateRoot, "prevStateRoot is different from newStateRoot in the parent batch");
-    uint64 accTotalL1Messages = _parentBatch.totalL1Messages;
+    /**********************
+     * Function Modifiers *
+     **********************/
 
-    bytes32 publicInputHash;
-    uint64 numTransactionsInBatch;
-    uint64 lastBlockTimestamp;
-    (publicInputHash, numTransactionsInBatch, accTotalL1Messages, lastBlockTimestamp) = _computePublicInputHash(
-      accTotalL1Messages,
-      _batch
-    );
+    modifier OnlySequencer() {
+        // @todo In the decentralize mode, it should be only called by a list of validator.
+        require(isSequencer[msg.sender], "caller not sequencer");
+        _;
+    }
 
-    BatchStored storage _batchInStorage = batches[publicInputHash];
+    /***************
+     * Constructor *
+     ***************/
 
-    require(_batchInStorage.newStateRoot == bytes32(0), "Batch already commited");
-    _batchInStorage.newStateRoot = _batch.newStateRoot;
-    _batchInStorage.withdrawTrieRoot = _batch.withdrawTrieRoot;
-    _batchInStorage.batchIndex = _batch.batchIndex;
-    _batchInStorage.parentBatchHash = _batch.parentBatchHash;
-    _batchInStorage.timestamp = lastBlockTimestamp;
-    _batchInStorage.numTransactions = numTransactionsInBatch;
-    _batchInStorage.totalL1Messages = accTotalL1Messages;
+    constructor(
+        uint256 _chainId,
+        uint256 _maxNumTxInBatch,
+        bytes32 _paddingTxHash
+    ) {
+        layer2ChainId = _chainId;
+        maxNumTxInBatch = _maxNumTxInBatch;
+        paddingTxHash = _paddingTxHash;
+    }
 
-    emit CommitBatch(publicInputHash);
+    function initialize(address _messageQueue) public initializer {
+        OwnableUpgradeable.__Ownable_init();
 
-    return publicInputHash;
-  }
+        messageQueue = _messageQueue;
+    }
 
-  /// @dev Internal function to compute the public input hash.
-  /// @param accTotalL1Messages The number of total L1 messages in previous batch.
-  /// @param batch The batch to compute.
-  function _computePublicInputHash(uint64 accTotalL1Messages, Batch memory batch)
-    internal
-    view
-    returns (
-      bytes32,
-      uint64,
-      uint64,
-      uint64
-    )
-  {
-    uint256 publicInputsPtr;
-    // 1. append prevStateRoot, newStateRoot and withdrawTrieRoot to public inputs
+    /*************************
+     * Public View Functions *
+     *************************/
+
+    /// @inheritdoc IScrollChain
+    function isBatchFinalized(bytes32 _batchHash) external view override returns (bool) {
+        BatchStored storage _batch = batches[_batchHash];
+        if (_batch.newStateRoot == bytes32(0)) {
+            return false;
+        }
+        return batches[lastFinalizedBatchHash].batchIndex >= _batch.batchIndex;
+    }
+
+    /// @inheritdoc IScrollChain
+    function getL2MessageRoot(bytes32 _batchHash) external view override returns (bytes32) {
+        return batches[_batchHash].withdrawTrieRoot;
+    }
+
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
+
+    /// @notice Import layer 2 genesis block
+    function importGenesisBatch(Batch memory _genesisBatch) external {
+        require(lastFinalizedBatchHash == bytes32(0), "Genesis batch imported");
+        require(_genesisBatch.blocks.length == 1, "Not exact one block in genesis");
+        require(_genesisBatch.prevStateRoot == bytes32(0), "Nonzero prevStateRoot");
+
+        BlockContext memory _genesisBlock = _genesisBatch.blocks[0];
+
+        require(_genesisBlock.blockHash != bytes32(0), "Block hash is zero");
+        require(_genesisBlock.blockNumber == 0, "Block is not genesis");
+        require(_genesisBlock.parentHash == bytes32(0), "Parent hash not empty");
+
+        bytes32 _batchHash = _commitBatch(_genesisBatch);
+
+        lastFinalizedBatchHash = _batchHash;
+        finalizedBatches[0] = _batchHash;
+        batches[_batchHash].finalized = true;
+
+        emit FinalizeBatch(_batchHash);
+    }
+
+    /// @inheritdoc IScrollChain
+    function commitBatch(Batch memory _batch) public override OnlySequencer {
+        _commitBatch(_batch);
+    }
+
+    /// @inheritdoc IScrollChain
+    function commitBatches(Batch[] memory _batches) public override OnlySequencer {
+        for (uint256 i = 0; i < _batches.length; i++) {
+            _commitBatch(_batches[i]);
+        }
+    }
+
+    /// @inheritdoc IScrollChain
+    function revertBatch(bytes32 _batchHash) external override OnlySequencer {
+        BatchStored storage _batch = batches[_batchHash];
+
+        require(_batch.newStateRoot != bytes32(0), "No such batch");
+        require(!_batch.finalized, "Unable to revert finalized batch");
+
+        // delete committed batch
+        delete batches[_batchHash];
+
+        emit RevertBatch(_batchHash);
+    }
+
+    /// @inheritdoc IScrollChain
+    function finalizeBatchWithProof(
+        bytes32 _batchHash,
+        uint256[] memory _proof,
+        uint256[] memory _instances
+    ) external override OnlySequencer {
+        BatchStored storage _batch = batches[_batchHash];
+        require(_batch.newStateRoot != bytes32(0), "No such batch");
+        require(!_batch.finalized, "Batch is already finalized");
+
+        // @note skip parent check for now, since we may not prove blocks in order.
+        // bytes32 _parentHash = _block.header.parentHash;
+        // require(lastFinalizedBlockHash == _parentHash, "parent not latest finalized");
+        // this check below is not needed, just incase
+        // require(blocks[_parentHash].verified, "parent not verified");
+
+        // @todo add verification logic
+        RollupVerifier.verify(_proof, _instances);
+
+        uint256 _batchIndex = _batch.batchIndex;
+        finalizedBatches[_batchIndex] = _batchHash;
+        _batch.finalized = true;
+
+        BatchStored storage _finalizedBatch = batches[lastFinalizedBatchHash];
+        if (_batchIndex > _finalizedBatch.batchIndex) {
+            lastFinalizedBatchHash = _batchHash;
+        }
+
+        emit FinalizeBatch(_batchHash);
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update the status of sequencer.
+    /// @dev This function can only called by contract owner.
+    /// @param _account The address of account to update.
+    /// @param _status The status of the account to update.
+    function updateSequencer(address _account, bool _status) external onlyOwner {
+        isSequencer[_account] = _status;
+
+        emit UpdateSequencer(_account, _status);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @dev Internal function to commit a batch.
+    /// @param _batch The batch to commit.
+    function _commitBatch(Batch memory _batch) internal returns (bytes32) {
+        // check whether the batch is empty
+        require(_batch.blocks.length > 0, "Batch is empty");
+
+        BatchStored storage _parentBatch = batches[_batch.parentBatchHash];
+        require(
+            _parentBatch.newStateRoot == _batch.prevStateRoot,
+            "prevStateRoot is different from newStateRoot in the parent batch"
+        );
+        uint64 accTotalL1Messages = _parentBatch.totalL1Messages;
+
+        bytes32 publicInputHash;
+        uint64 numTransactionsInBatch;
+        uint64 lastBlockTimestamp;
+        (publicInputHash, numTransactionsInBatch, accTotalL1Messages, lastBlockTimestamp) = _computePublicInputHash(
+            accTotalL1Messages,
+            _batch
+        );
+
+        BatchStored storage _batchInStorage = batches[publicInputHash];
+
+        require(_batchInStorage.newStateRoot == bytes32(0), "Batch already commited");
+        _batchInStorage.newStateRoot = _batch.newStateRoot;
+        _batchInStorage.withdrawTrieRoot = _batch.withdrawTrieRoot;
+        _batchInStorage.batchIndex = _batch.batchIndex;
+        _batchInStorage.parentBatchHash = _batch.parentBatchHash;
+        _batchInStorage.timestamp = lastBlockTimestamp;
+        _batchInStorage.numTransactions = numTransactionsInBatch;
+        _batchInStorage.totalL1Messages = accTotalL1Messages;
+
+        emit CommitBatch(publicInputHash);
+
+        return publicInputHash;
+    }
+
+    /// @dev Internal function to compute the public input hash.
+    /// @param accTotalL1Messages The number of total L1 messages in previous batch.
+    /// @param batch The batch to compute.
+    function _computePublicInputHash(uint64 accTotalL1Messages, Batch memory batch)
+        internal
+        view
+        returns (
+            bytes32,
+            uint64,
+            uint64,
+            uint64
+        )
     {
-      bytes32 prevStateRoot = batch.prevStateRoot;
-      bytes32 newStateRoot = batch.newStateRoot;
-      bytes32 withdrawTrieRoot = batch.withdrawTrieRoot;
-      // number of bytes in public inputs: 32 * 3 + 124 * blocks + 32 * MAX_NUM_TXS
-      uint256 publicInputsSize = 32 * 3 + batch.blocks.length * 124 + 32 * maxNumTxInBatch;
-      assembly {
-        publicInputsPtr := mload(0x40)
-        mstore(0x40, add(publicInputsPtr, publicInputsSize))
-        mstore(publicInputsPtr, prevStateRoot)
-        publicInputsPtr := add(publicInputsPtr, 0x20)
-        mstore(publicInputsPtr, newStateRoot)
-        publicInputsPtr := add(publicInputsPtr, 0x20)
-        mstore(publicInputsPtr, withdrawTrieRoot)
-        publicInputsPtr := add(publicInputsPtr, 0x20)
-      }
-    }
+        uint256 publicInputsPtr;
+        // 1. append prevStateRoot, newStateRoot and withdrawTrieRoot to public inputs
+        {
+            bytes32 prevStateRoot = batch.prevStateRoot;
+            bytes32 newStateRoot = batch.newStateRoot;
+            bytes32 withdrawTrieRoot = batch.withdrawTrieRoot;
+            // number of bytes in public inputs: 32 * 3 + 124 * blocks + 32 * MAX_NUM_TXS
+            uint256 publicInputsSize = 32 * 3 + batch.blocks.length * 124 + 32 * maxNumTxInBatch;
+            assembly {
+                publicInputsPtr := mload(0x40)
+                mstore(0x40, add(publicInputsPtr, publicInputsSize))
+                mstore(publicInputsPtr, prevStateRoot)
+                publicInputsPtr := add(publicInputsPtr, 0x20)
+                mstore(publicInputsPtr, newStateRoot)
+                publicInputsPtr := add(publicInputsPtr, 0x20)
+                mstore(publicInputsPtr, withdrawTrieRoot)
+                publicInputsPtr := add(publicInputsPtr, 0x20)
+            }
+        }
 
-    uint64 numTransactionsInBatch;
-    BlockContext memory _block;
-    // 2. append block information to public inputs.
-    for (uint256 i = 0; i < batch.blocks.length; i++) {
-      // validate blocks, we won't check first block against previous batch.
-      {
-        BlockContext memory _currentBlock = batch.blocks[i];
-        if (i > 0) {
-          require(_block.blockHash == _currentBlock.parentHash, "Parent hash mismatch");
-          require(_block.blockNumber + 1 == _currentBlock.blockNumber, "Block number mismatch");
-        }
-        _block = _currentBlock;
-      }
+        uint64 numTransactionsInBatch;
+        BlockContext memory _block;
+        // 2. append block information to public inputs.
+        for (uint256 i = 0; i < batch.blocks.length; i++) {
+            // validate blocks, we won't check first block against previous batch.
+            {
+                BlockContext memory _currentBlock = batch.blocks[i];
+                if (i > 0) {
+                    require(_block.blockHash == _currentBlock.parentHash, "Parent hash mismatch");
+                    require(_block.blockNumber + 1 == _currentBlock.blockNumber, "Block number mismatch");
+                }
+                _block = _currentBlock;
+            }
 
-      // append blockHash and parentHash to public inputs
-      {
-        bytes32 blockHash = _block.blockHash;
-        bytes32 parentHash = _block.parentHash;
-        assembly {
-          mstore(publicInputsPtr, blockHash)
-          publicInputsPtr := add(publicInputsPtr, 0x20)
-          mstore(publicInputsPtr, parentHash)
-          publicInputsPtr := add(publicInputsPtr, 0x20)
+            // append blockHash and parentHash to public inputs
+            {
+                bytes32 blockHash = _block.blockHash;
+                bytes32 parentHash = _block.parentHash;
+                assembly {
+                    mstore(publicInputsPtr, blockHash)
+                    publicInputsPtr := add(publicInputsPtr, 0x20)
+                    mstore(publicInputsPtr, parentHash)
+                    publicInputsPtr := add(publicInputsPtr, 0x20)
+                }
+            }
+            // append blockNumber and blockTimestamp to public inputs
+            {
+                uint256 blockNumber = _block.blockNumber;
+                uint256 blockTimestamp = _block.timestamp;
+                assembly {
+                    mstore(publicInputsPtr, shl(192, blockNumber))
+                    publicInputsPtr := add(publicInputsPtr, 0x8)
+                    mstore(publicInputsPtr, shl(192, blockTimestamp))
+                    publicInputsPtr := add(publicInputsPtr, 0x8)
+                }
+            }
+            // append baseFee to public inputs
+            {
+                uint256 baseFee = _block.baseFee;
+                assembly {
+                    mstore(publicInputsPtr, baseFee)
+                    publicInputsPtr := add(publicInputsPtr, 0x20)
+                }
+            }
+            uint64 numTransactionsInBlock = _block.numTransactions;
+            // gasLimit, numTransactions and numL1Messages to public inputs
+            {
+                uint256 gasLimit = _block.gasLimit;
+                uint256 numL1MessagesInBlock = _block.numL1Messages;
+                assembly {
+                    mstore(publicInputsPtr, shl(192, gasLimit))
+                    publicInputsPtr := add(publicInputsPtr, 0x8)
+                    mstore(publicInputsPtr, shl(240, numTransactionsInBlock))
+                    publicInputsPtr := add(publicInputsPtr, 0x2)
+                    mstore(publicInputsPtr, shl(240, numL1MessagesInBlock))
+                    publicInputsPtr := add(publicInputsPtr, 0x2)
+                }
+            }
+            numTransactionsInBatch += numTransactionsInBlock;
         }
-      }
-      // append blockNumber and blockTimestamp to public inputs
-      {
-        uint256 blockNumber = _block.blockNumber;
-        uint256 blockTimestamp = _block.timestamp;
-        assembly {
-          mstore(publicInputsPtr, shl(192, blockNumber))
-          publicInputsPtr := add(publicInputsPtr, 0x8)
-          mstore(publicInputsPtr, shl(192, blockTimestamp))
-          publicInputsPtr := add(publicInputsPtr, 0x8)
-        }
-      }
-      // append baseFee to public inputs
-      {
-        uint256 baseFee = _block.baseFee;
-        assembly {
-          mstore(publicInputsPtr, baseFee)
-          publicInputsPtr := add(publicInputsPtr, 0x20)
-        }
-      }
-      uint64 numTransactionsInBlock = _block.numTransactions;
-      // gasLimit, numTransactions and numL1Messages to public inputs
-      {
-        uint256 gasLimit = _block.gasLimit;
-        uint256 numL1MessagesInBlock = _block.numL1Messages;
-        assembly {
-          mstore(publicInputsPtr, shl(192, gasLimit))
-          publicInputsPtr := add(publicInputsPtr, 0x8)
-          mstore(publicInputsPtr, shl(240, numTransactionsInBlock))
-          publicInputsPtr := add(publicInputsPtr, 0x2)
-          mstore(publicInputsPtr, shl(240, numL1MessagesInBlock))
-          publicInputsPtr := add(publicInputsPtr, 0x2)
-        }
-      }
-      numTransactionsInBatch += numTransactionsInBlock;
-    }
-    require(numTransactionsInBatch <= maxNumTxInBatch, "Too many transactions in batch");
+        require(numTransactionsInBatch <= maxNumTxInBatch, "Too many transactions in batch");
 
-    // 3. append transaction hash to public inputs.
-    address _messageQueue = messageQueue;
-    uint256 _l2TxnPtr;
-    {
-      bytes memory l2Transactions = batch.l2Transactions;
-      assembly {
-        _l2TxnPtr := add(l2Transactions, 0x20)
-      }
-    }
-    for (uint256 i = 0; i < batch.blocks.length; i++) {
-      uint256 numL1MessagesInBlock = batch.blocks[i].numL1Messages;
-      while (numL1MessagesInBlock > 0) {
-        bytes32 hash = IL1MessageQueue(_messageQueue).getCrossDomainMessage(uint64(accTotalL1Messages));
-        assembly {
-          mstore(publicInputsPtr, hash)
-          publicInputsPtr := add(publicInputsPtr, 0x20)
+        // 3. append transaction hash to public inputs.
+        address _messageQueue = messageQueue;
+        uint256 _l2TxnPtr;
+        {
+            bytes memory l2Transactions = batch.l2Transactions;
+            assembly {
+                _l2TxnPtr := add(l2Transactions, 0x20)
+            }
         }
-        unchecked {
-          accTotalL1Messages += 1;
-          numL1MessagesInBlock -= 1;
+        for (uint256 i = 0; i < batch.blocks.length; i++) {
+            uint256 numL1MessagesInBlock = batch.blocks[i].numL1Messages;
+            while (numL1MessagesInBlock > 0) {
+                bytes32 hash = IL1MessageQueue(_messageQueue).getCrossDomainMessage(uint64(accTotalL1Messages));
+                assembly {
+                    mstore(publicInputsPtr, hash)
+                    publicInputsPtr := add(publicInputsPtr, 0x20)
+                }
+                unchecked {
+                    accTotalL1Messages += 1;
+                    numL1MessagesInBlock -= 1;
+                }
+            }
+            numL1MessagesInBlock = batch.blocks[i].numL1Messages;
+            uint256 numTransactionsInBlock = batch.blocks[i].numTransactions;
+            for (uint256 j = numL1MessagesInBlock; j < numTransactionsInBlock; ++j) {
+                bytes32 hash;
+                assembly {
+                    let txPayloadLength := shr(224, mload(_l2TxnPtr))
+                    _l2TxnPtr := add(_l2TxnPtr, 4)
+                    _l2TxnPtr := add(_l2TxnPtr, txPayloadLength)
+                    hash := keccak256(sub(_l2TxnPtr, txPayloadLength), txPayloadLength)
+                    mstore(publicInputsPtr, hash)
+                    publicInputsPtr := add(publicInputsPtr, 0x20)
+                }
+            }
         }
-      }
-      numL1MessagesInBlock = batch.blocks[i].numL1Messages;
-      uint256 numTransactionsInBlock = batch.blocks[i].numTransactions;
-      for (uint256 j = numL1MessagesInBlock; j < numTransactionsInBlock; ++j) {
-        bytes32 hash;
-        assembly {
-          let txPayloadLength := shr(224, mload(_l2TxnPtr))
-          _l2TxnPtr := add(_l2TxnPtr, 4)
-          _l2TxnPtr := add(_l2TxnPtr, txPayloadLength)
-          hash := keccak256(sub(_l2TxnPtr, txPayloadLength), txPayloadLength)
-          mstore(publicInputsPtr, hash)
-          publicInputsPtr := add(publicInputsPtr, 0x20)
+
+        // 4. append padding transaction to public inputs.
+        bytes32 txHashPadding = paddingTxHash;
+        for (uint256 i = numTransactionsInBatch; i < maxNumTxInBatch; i++) {
+            assembly {
+                mstore(publicInputsPtr, txHashPadding)
+                publicInputsPtr := add(publicInputsPtr, 0x20)
+            }
         }
-      }
-    }
 
-    // 4. append padding transaction to public inputs.
-    bytes32 txHashPadding = paddingTxHash;
-    for (uint256 i = numTransactionsInBatch; i < maxNumTxInBatch; i++) {
-      assembly {
-        mstore(publicInputsPtr, txHashPadding)
-        publicInputsPtr := add(publicInputsPtr, 0x20)
-      }
-    }
+        // 5. compute public input hash
+        bytes32 publicInputHash;
+        {
+            uint256 publicInputsSize = 32 * 3 + batch.blocks.length * 124 + 32 * maxNumTxInBatch;
+            assembly {
+                publicInputHash := keccak256(sub(publicInputsPtr, publicInputsSize), publicInputsSize)
+            }
+        }
 
-    // 5. compute public input hash
-    bytes32 publicInputHash;
-    {
-      uint256 publicInputsSize = 32 * 3 + batch.blocks.length * 124 + 32 * maxNumTxInBatch;
-      assembly {
-        publicInputHash := keccak256(sub(publicInputsPtr, publicInputsSize), publicInputsSize)
-      }
+        return (publicInputHash, numTransactionsInBatch, accTotalL1Messages, _block.timestamp);
     }
-
-    return (publicInputHash, numTransactionsInBatch, accTotalL1Messages, _block.timestamp);
-  }
 }

contracts/src/L1/rollup/ScrollChainCommitmentVerifier.sol

@@ -2,58 +2,58 @@
 
 pragma solidity ^0.8.0;
 
-import { ScrollChain } from "./ScrollChain.sol";
-import { ZkTrieVerifier } from "../../libraries/verifier/ZkTrieVerifier.sol";
+import {ScrollChain} from "./ScrollChain.sol";
+import {ZkTrieVerifier} from "../../libraries/verifier/ZkTrieVerifier.sol";
 
 contract ScrollChainCommitmentVerifier {
-  /// @notice The address of poseidon hash contract
-  address public immutable poseidon;
+    /// @notice The address of poseidon hash contract
+    address public immutable poseidon;
 
-  /// @notice The address of ScrollChain contract.
-  address public immutable rollup;
+    /// @notice The address of ScrollChain contract.
+    address public immutable rollup;
 
-  constructor(address _poseidon, address _rollup) {
-    poseidon = _poseidon;
-    rollup = _rollup;
-  }
+    constructor(address _poseidon, address _rollup) {
+        poseidon = _poseidon;
+        rollup = _rollup;
+    }
 
-  /// @notice Validates a proof from eth_getProof in l2geth.
-  /// @param account The address of the contract.
-  /// @param storageKey The storage slot to verify.
-  /// @param proof The rlp encoding result of eth_getProof.
-  /// @return stateRoot The computed state root. Must be checked by the caller.
-  /// @return storageValue The value of `storageKey`.
-  ///
-  /// The encoding order of `proof` is
-  /// ```text
-  /// |        1 byte        |      ...      |        1 byte        |      ...      |
-  /// | account proof length | account proof | storage proof length | storage proof |
-  /// ```
-  function verifyZkTrieProof(
-    address account,
-    bytes32 storageKey,
-    bytes calldata proof
-  ) public view returns (bytes32 stateRoot, bytes32 storageValue) {
-    return ZkTrieVerifier.verifyZkTrieProof(poseidon, account, storageKey, proof);
-  }
+    /// @notice Validates a proof from eth_getProof in l2geth.
+    /// @param account The address of the contract.
+    /// @param storageKey The storage slot to verify.
+    /// @param proof The rlp encoding result of eth_getProof.
+    /// @return stateRoot The computed state root. Must be checked by the caller.
+    /// @return storageValue The value of `storageKey`.
+    ///
+    /// The encoding order of `proof` is
+    /// ```text
+    /// |        1 byte        |      ...      |        1 byte        |      ...      |
+    /// | account proof length | account proof | storage proof length | storage proof |
+    /// ```
+    function verifyZkTrieProof(
+        address account,
+        bytes32 storageKey,
+        bytes calldata proof
+    ) public view returns (bytes32 stateRoot, bytes32 storageValue) {
+        return ZkTrieVerifier.verifyZkTrieProof(poseidon, account, storageKey, proof);
+    }
 
-  /// @notice Verifies a batch inclusion proof.
-  /// @param batchHash The hash of the batch.
-  /// @param account The address of the contract in L2.
-  /// @param storageKey The storage key inside the contract in L2.
-  /// @param proof The rlp encoding result of eth_getProof.
-  /// @return storageValue The value of `storageKey`.
-  function verifyStateCommitment(
-    bytes32 batchHash,
-    address account,
-    bytes32 storageKey,
-    bytes calldata proof
-  ) external view returns (bytes32 storageValue) {
-    require(ScrollChain(rollup).isBatchFinalized(batchHash), "Batch not finalized");
+    /// @notice Verifies a batch inclusion proof.
+    /// @param batchHash The hash of the batch.
+    /// @param account The address of the contract in L2.
+    /// @param storageKey The storage key inside the contract in L2.
+    /// @param proof The rlp encoding result of eth_getProof.
+    /// @return storageValue The value of `storageKey`.
+    function verifyStateCommitment(
+        bytes32 batchHash,
+        address account,
+        bytes32 storageKey,
+        bytes calldata proof
+    ) external view returns (bytes32 storageValue) {
+        require(ScrollChain(rollup).isBatchFinalized(batchHash), "Batch not finalized");
 
-    bytes32 computedStateRoot;
-    (computedStateRoot, storageValue) = ZkTrieVerifier.verifyZkTrieProof(poseidon, account, storageKey, proof);
-    (bytes32 expectedStateRoot, , , , , , , ) = ScrollChain(rollup).batches(batchHash);
-    require(computedStateRoot == expectedStateRoot, "Invalid inclusion proof");
-  }
+        bytes32 computedStateRoot;
+        (computedStateRoot, storageValue) = ZkTrieVerifier.verifyZkTrieProof(poseidon, account, storageKey, proof);
+        (bytes32 expectedStateRoot, , , , , , , ) = ScrollChain(rollup).batches(batchHash);
+        require(computedStateRoot == expectedStateRoot, "Invalid inclusion proof");
+    }
 }

contracts/src/L2/IL2ScrollMessenger.sol

@@ -2,50 +2,50 @@
 
 pragma solidity ^0.8.0;
 
-import { IScrollMessenger } from "../libraries/IScrollMessenger.sol";
+import {IScrollMessenger} from "../libraries/IScrollMessenger.sol";
 
 interface IL2ScrollMessenger is IScrollMessenger {
-  /***********
-   * Structs *
-   ***********/
+    /***********
+     * Structs *
+     ***********/
 
-  struct L1MessageProof {
-    bytes32 blockHash;
-    bytes stateRootProof;
-  }
+    struct L1MessageProof {
+        bytes32 blockHash;
+        bytes stateRootProof;
+    }
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice execute L1 => L2 message
-  /// @dev Make sure this is only called by privileged accounts.
-  /// @param from The address of the sender of the message.
-  /// @param to The address of the recipient of the message.
-  /// @param value The msg.value passed to the message call.
-  /// @param nonce The nonce of the message to avoid replay attack.
-  /// @param message The content of the message.
-  function relayMessage(
-    address from,
-    address to,
-    uint256 value,
-    uint256 nonce,
-    bytes calldata message
-  ) external;
+    /// @notice execute L1 => L2 message
+    /// @dev Make sure this is only called by privileged accounts.
+    /// @param from The address of the sender of the message.
+    /// @param to The address of the recipient of the message.
+    /// @param value The msg.value passed to the message call.
+    /// @param nonce The nonce of the message to avoid replay attack.
+    /// @param message The content of the message.
+    function relayMessage(
+        address from,
+        address to,
+        uint256 value,
+        uint256 nonce,
+        bytes calldata message
+    ) external;
 
-  /// @notice execute L1 => L2 message with proof
-  /// @param from The address of the sender of the message.
-  /// @param to The address of the recipient of the message.
-  /// @param value The msg.value passed to the message call.
-  /// @param nonce The nonce of the message to avoid replay attack.
-  /// @param message The content of the message.
-  /// @param proof The message proof.
-  function retryMessageWithProof(
-    address from,
-    address to,
-    uint256 value,
-    uint256 nonce,
-    bytes calldata message,
-    L1MessageProof calldata proof
-  ) external;
+    /// @notice execute L1 => L2 message with proof
+    /// @param from The address of the sender of the message.
+    /// @param to The address of the recipient of the message.
+    /// @param value The msg.value passed to the message call.
+    /// @param nonce The nonce of the message to avoid replay attack.
+    /// @param message The content of the message.
+    /// @param proof The message proof.
+    function retryMessageWithProof(
+        address from,
+        address to,
+        uint256 value,
+        uint256 nonce,
+        bytes calldata message,
+        L1MessageProof calldata proof
+    ) external;
 }

contracts/src/L2/L2ScrollMessenger.sol

@@ -2,17 +2,17 @@
 
 pragma solidity ^0.8.0;
 
-import { PausableUpgradeable } from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
+import {PausableUpgradeable} from "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
 
-import { IL2ScrollMessenger } from "./IL2ScrollMessenger.sol";
-import { L2MessageQueue } from "./predeploys/L2MessageQueue.sol";
-import { IL1BlockContainer } from "./predeploys/IL1BlockContainer.sol";
-import { IL1GasPriceOracle } from "./predeploys/IL1GasPriceOracle.sol";
+import {IL2ScrollMessenger} from "./IL2ScrollMessenger.sol";
+import {L2MessageQueue} from "./predeploys/L2MessageQueue.sol";
+import {IL1BlockContainer} from "./predeploys/IL1BlockContainer.sol";
+import {IL1GasPriceOracle} from "./predeploys/IL1GasPriceOracle.sol";
 
-import { PatriciaMerkleTrieVerifier } from "../libraries/verifier/PatriciaMerkleTrieVerifier.sol";
-import { ScrollConstants } from "../libraries/constants/ScrollConstants.sol";
-import { IScrollMessenger } from "../libraries/IScrollMessenger.sol";
-import { ScrollMessengerBase } from "../libraries/ScrollMessengerBase.sol";
+import {PatriciaMerkleTrieVerifier} from "../libraries/verifier/PatriciaMerkleTrieVerifier.sol";
+import {ScrollConstants} from "../libraries/constants/ScrollConstants.sol";
+import {IScrollMessenger} from "../libraries/IScrollMessenger.sol";
+import {ScrollMessengerBase} from "../libraries/ScrollMessengerBase.sol";
 
 /// @title L2ScrollMessenger
 /// @notice The `L2ScrollMessenger` contract can:
@@ -24,282 +24,327 @@ import { ScrollMessengerBase } from "../libraries/ScrollMessengerBase.sol";
 /// @dev It should be a predeployed contract in layer 2 and should hold infinite amount
 /// of Ether (Specifically, `uint256(-1)`), which can be initialized in Genesis Block.
 contract L2ScrollMessenger is ScrollMessengerBase, PausableUpgradeable, IL2ScrollMessenger {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when the maximum number of times each message can fail in L2 is updated.
-  /// @param maxFailedExecutionTimes The new maximum number of times each message can fail in L2.
-  event UpdateMaxFailedExecutionTimes(uint256 maxFailedExecutionTimes);
+    /// @notice Emitted when the maximum number of times each message can fail in L2 is updated.
+    /// @param maxFailedExecutionTimes The new maximum number of times each message can fail in L2.
+    event UpdateMaxFailedExecutionTimes(uint256 maxFailedExecutionTimes);
 
-  /*************
-   * Constants *
-   *************/
+    /*************
+     * Constants *
+     *************/
 
-  uint256 private constant MIN_GAS_LIMIT = 21000;
+    uint256 private constant MIN_GAS_LIMIT = 21000;
 
-  /// @notice The contract contains the list of L1 blocks.
-  address public immutable blockContainer;
+    /// @notice The contract contains the list of L1 blocks.
+    address public immutable blockContainer;
 
-  /// @notice The address of L2MessageQueue.
-  address public immutable gasOracle;
+    /// @notice The address of L2MessageQueue.
+    address public immutable gasOracle;
 
-  /// @notice The address of L2MessageQueue.
-  address public immutable messageQueue;
+    /// @notice The address of L2MessageQueue.
+    address public immutable messageQueue;
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from L2 message hash to sent status.
-  mapping(bytes32 => bool) public isL2MessageSent;
+    /// @notice Mapping from L2 message hash to sent status.
+    mapping(bytes32 => bool) public isL2MessageSent;
 
-  /// @notice Mapping from L1 message hash to a boolean value indicating if the message has been successfully executed.
-  mapping(bytes32 => bool) public isL1MessageExecuted;
+    /// @notice Mapping from L1 message hash to a boolean value indicating if the message has been successfully executed.
+    mapping(bytes32 => bool) public isL1MessageExecuted;
 
-  /// @notice Mapping from L1 message hash to the number of failure times.
-  mapping(bytes32 => uint256) public l1MessageFailedTimes;
+    /// @notice Mapping from L1 message hash to the number of failure times.
+    mapping(bytes32 => uint256) public l1MessageFailedTimes;
 
-  /// @notice The maximum number of times each L1 message can fail on L2.
-  uint256 public maxFailedExecutionTimes;
+    /// @notice The maximum number of times each L1 message can fail on L2.
+    uint256 public maxFailedExecutionTimes;
 
-  /***************
-   * Constructor *
-   ***************/
+    // @note move to ScrollMessengerBase in next big refactor
+    /// @dev The status of for non-reentrant check.
+    uint256 private _lock_status;
 
-  constructor(
-    address _blockContainer,
-    address _gasOracle,
-    address _messageQueue
-  ) {
-    blockContainer = _blockContainer;
-    gasOracle = _gasOracle;
-    messageQueue = _messageQueue;
-  }
+    /**********************
+     * Function Modifiers *
+     **********************/
 
-  function initialize(address _counterpart, address _feeVault) external initializer {
-    PausableUpgradeable.__Pausable_init();
-    ScrollMessengerBase._initialize(_counterpart, _feeVault);
+    modifier nonReentrant() {
+        // On the first call to nonReentrant, _notEntered will be true
+        require(_lock_status != _ENTERED, "ReentrancyGuard: reentrant call");
 
-    maxFailedExecutionTimes = 3;
+        // Any calls to nonReentrant after this point will fail
+        _lock_status = _ENTERED;
 
-    // initialize to a nonzero value
-    xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
-  }
+        _;
 
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @notice Check whether the l1 message is included in the corresponding L1 block.
-  /// @param _blockHash The block hash where the message should in.
-  /// @param _msgHash The hash of the message to check.
-  /// @param _proof The encoded storage proof from eth_getProof.
-  /// @return bool Return true is the message is included in L1, otherwise return false.
-  function verifyMessageInclusionStatus(
-    bytes32 _blockHash,
-    bytes32 _msgHash,
-    bytes calldata _proof
-  ) public view returns (bool) {
-    bytes32 _expectedStateRoot = IL1BlockContainer(blockContainer).getStateRoot(_blockHash);
-    require(_expectedStateRoot != bytes32(0), "Block is not imported");
-
-    // @todo fix the actual slot later.
-    bytes32 _storageKey;
-    // `mapping(bytes32 => bool) public isL1MessageSent` is the 105-nd slot of contract `L1ScrollMessenger`.
-    assembly {
-      mstore(0x00, _msgHash)
-      mstore(0x20, 105)
-      _storageKey := keccak256(0x00, 0x40)
+        // By storing the original value once again, a refund is triggered (see
+        // https://eips.ethereum.org/EIPS/eip-2200)
+        _lock_status = _NOT_ENTERED;
     }
 
-    (bytes32 _computedStateRoot, bytes32 _storageValue) = PatriciaMerkleTrieVerifier.verifyPatriciaProof(
-      counterpart,
-      _storageKey,
-      _proof
-    );
-    require(_computedStateRoot == _expectedStateRoot, "State roots mismatch");
+    /***************
+     * Constructor *
+     ***************/
 
-    return uint256(_storageValue) == 1;
-  }
-
-  /// @notice Check whether the message is executed in the corresponding L1 block.
-  /// @param _blockHash The block hash where the message should in.
-  /// @param _msgHash The hash of the message to check.
-  /// @param _proof The encoded storage proof from eth_getProof.
-  /// @return bool Return true is the message is executed in L1, otherwise return false.
-  function verifyMessageExecutionStatus(
-    bytes32 _blockHash,
-    bytes32 _msgHash,
-    bytes calldata _proof
-  ) external view returns (bool) {
-    bytes32 _expectedStateRoot = IL1BlockContainer(blockContainer).getStateRoot(_blockHash);
-    require(_expectedStateRoot != bytes32(0), "Block not imported");
-
-    // @todo fix the actual slot later.
-    bytes32 _storageKey;
-    // `mapping(bytes32 => bool) public isL2MessageExecuted` is the 106-th slot of contract `L1ScrollMessenger`.
-    assembly {
-      mstore(0x00, _msgHash)
-      mstore(0x20, 106)
-      _storageKey := keccak256(0x00, 0x40)
+    constructor(
+        address _blockContainer,
+        address _gasOracle,
+        address _messageQueue
+    ) {
+        blockContainer = _blockContainer;
+        gasOracle = _gasOracle;
+        messageQueue = _messageQueue;
     }
 
-    (bytes32 _computedStateRoot, bytes32 _storageValue) = PatriciaMerkleTrieVerifier.verifyPatriciaProof(
-      counterpart,
-      _storageKey,
-      _proof
-    );
-    require(_computedStateRoot == _expectedStateRoot, "State root mismatch");
+    function initialize(address _counterpart, address _feeVault) external initializer {
+        PausableUpgradeable.__Pausable_init();
+        ScrollMessengerBase._initialize(_counterpart, _feeVault);
 
-    return uint256(_storageValue) == 1;
-  }
+        maxFailedExecutionTimes = 3;
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IScrollMessenger
-  function sendMessage(
-    address _to,
-    uint256 _value,
-    bytes memory _message,
-    uint256 _gasLimit
-  ) external payable override whenNotPaused {
-    // by pass fee vault relay
-    if (feeVault != msg.sender) {
-      require(_gasLimit >= MIN_GAS_LIMIT, "gas limit too small");
+        // initialize to a nonzero value
+        xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
     }
 
-    // compute and deduct the messaging fee to fee vault.
-    uint256 _fee = _gasLimit * IL1GasPriceOracle(gasOracle).l1BaseFee();
-    require(msg.value >= _value + _fee, "Insufficient msg.value");
-    if (_fee > 0) {
-      (bool _success, ) = feeVault.call{ value: _fee }("");
-      require(_success, "Failed to deduct the fee");
+    /*************************
+     * Public View Functions *
+     *************************/
+
+    /// @notice Check whether the l1 message is included in the corresponding L1 block.
+    /// @param _blockHash The block hash where the message should in.
+    /// @param _msgHash The hash of the message to check.
+    /// @param _proof The encoded storage proof from eth_getProof.
+    /// @return bool Return true is the message is included in L1, otherwise return false.
+    function verifyMessageInclusionStatus(
+        bytes32 _blockHash,
+        bytes32 _msgHash,
+        bytes calldata _proof
+    ) public view returns (bool) {
+        bytes32 _expectedStateRoot = IL1BlockContainer(blockContainer).getStateRoot(_blockHash);
+        require(_expectedStateRoot != bytes32(0), "Block is not imported");
+
+        // @todo fix the actual slot later.
+        bytes32 _storageKey;
+        // `mapping(bytes32 => bool) public isL1MessageSent` is the 105-nd slot of contract `L1ScrollMessenger`.
+        assembly {
+            mstore(0x00, _msgHash)
+            mstore(0x20, 105)
+            _storageKey := keccak256(0x00, 0x40)
+        }
+
+        (bytes32 _computedStateRoot, bytes32 _storageValue) = PatriciaMerkleTrieVerifier.verifyPatriciaProof(
+            counterpart,
+            _storageKey,
+            _proof
+        );
+        require(_computedStateRoot == _expectedStateRoot, "State roots mismatch");
+
+        return uint256(_storageValue) == 1;
     }
 
-    uint256 _nonce = L2MessageQueue(messageQueue).nextMessageIndex();
-    bytes32 _xDomainCalldataHash = keccak256(_encodeXDomainCalldata(msg.sender, _to, _value, _nonce, _message));
+    /// @notice Check whether the message is executed in the corresponding L1 block.
+    /// @param _blockHash The block hash where the message should in.
+    /// @param _msgHash The hash of the message to check.
+    /// @param _proof The encoded storage proof from eth_getProof.
+    /// @return bool Return true is the message is executed in L1, otherwise return false.
+    function verifyMessageExecutionStatus(
+        bytes32 _blockHash,
+        bytes32 _msgHash,
+        bytes calldata _proof
+    ) external view returns (bool) {
+        bytes32 _expectedStateRoot = IL1BlockContainer(blockContainer).getStateRoot(_blockHash);
+        require(_expectedStateRoot != bytes32(0), "Block not imported");
 
-    // normally this won't happen, since each message has different nonce, but just in case.
-    require(!isL2MessageSent[_xDomainCalldataHash], "Duplicated message");
-    isL2MessageSent[_xDomainCalldataHash] = true;
+        // @todo fix the actual slot later.
+        bytes32 _storageKey;
+        // `mapping(bytes32 => bool) public isL2MessageExecuted` is the 106-th slot of contract `L1ScrollMessenger`.
+        assembly {
+            mstore(0x00, _msgHash)
+            mstore(0x20, 106)
+            _storageKey := keccak256(0x00, 0x40)
+        }
 
-    L2MessageQueue(messageQueue).appendMessage(_xDomainCalldataHash);
+        (bytes32 _computedStateRoot, bytes32 _storageValue) = PatriciaMerkleTrieVerifier.verifyPatriciaProof(
+            counterpart,
+            _storageKey,
+            _proof
+        );
+        require(_computedStateRoot == _expectedStateRoot, "State root mismatch");
 
-    emit SentMessage(msg.sender, _to, _value, _nonce, _gasLimit, _message);
-
-    // refund fee to tx.origin
-    unchecked {
-      uint256 _refund = msg.value - _fee - _value;
-      if (_refund > 0) {
-        (bool _success, ) = tx.origin.call{ value: _refund }("");
-        require(_success, "Failed to refund the fee");
-      }
+        return uint256(_storageValue) == 1;
     }
-  }
 
-  /// @inheritdoc IL2ScrollMessenger
-  function relayMessage(
-    address _from,
-    address _to,
-    uint256 _value,
-    uint256 _nonce,
-    bytes memory _message
-  ) external override whenNotPaused onlyWhitelistedSender(msg.sender) {
-    // anti reentrance
-    require(xDomainMessageSender == ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER, "Message is already in execution");
-
-    // @todo address unalis to check sender is L1ScrollMessenger
-
-    bytes32 _xDomainCalldataHash = keccak256(_encodeXDomainCalldata(_from, _to, _value, _nonce, _message));
-
-    require(!isL1MessageExecuted[_xDomainCalldataHash], "Message was already successfully executed");
-
-    _executeMessage(_from, _to, _value, _message, _xDomainCalldataHash);
-  }
-
-  /// @inheritdoc IL2ScrollMessenger
-  function retryMessageWithProof(
-    address _from,
-    address _to,
-    uint256 _value,
-    uint256 _nonce,
-    bytes memory _message,
-    L1MessageProof calldata _proof
-  ) external override whenNotPaused {
-    // anti reentrance
-    require(xDomainMessageSender == ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER, "Already in execution");
-
-    // check message status
-    bytes32 _xDomainCalldataHash = keccak256(_encodeXDomainCalldata(_from, _to, _value, _nonce, _message));
-    require(!isL1MessageExecuted[_xDomainCalldataHash], "Message successfully executed");
-    require(l1MessageFailedTimes[_xDomainCalldataHash] > 0, "Message not relayed before");
-
-    require(
-      verifyMessageInclusionStatus(_proof.blockHash, _xDomainCalldataHash, _proof.stateRootProof),
-      "Message not included"
-    );
-
-    _executeMessage(_from, _to, _value, _message, _xDomainCalldataHash);
-  }
-
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Pause the contract
-  /// @dev This function can only called by contract owner.
-  /// @param _status The pause status to update.
-  function setPause(bool _status) external onlyOwner {
-    if (_status) {
-      _pause();
-    } else {
-      _unpause();
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
+    /// @inheritdoc IScrollMessenger
+    function sendMessage(
+        address _to,
+        uint256 _value,
+        bytes memory _message,
+        uint256 _gasLimit
+    ) external payable override whenNotPaused {
+        _sendMessage(_to, _value, _message, _gasLimit, tx.origin);
     }
-  }
 
-  function updateMaxFailedExecutionTimes(uint256 _maxFailedExecutionTimes) external onlyOwner {
-    maxFailedExecutionTimes = _maxFailedExecutionTimes;
-
-    emit UpdateMaxFailedExecutionTimes(_maxFailedExecutionTimes);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  function _executeMessage(
-    address _from,
-    address _to,
-    uint256 _value,
-    bytes memory _message,
-    bytes32 _xDomainCalldataHash
-  ) internal {
-    // @todo check more `_to` address to avoid attack.
-    require(_to != messageQueue, "Forbid to call message queue");
-    require(_to != address(this), "Forbid to call self");
-
-    // @note This usually will never happen, just in case.
-    require(_from != xDomainMessageSender, "Invalid message sender");
-
-    xDomainMessageSender = _from;
-    // solhint-disable-next-line avoid-low-level-calls
-    (bool success, ) = _to.call{ value: _value }(_message);
-    // reset value to refund gas.
-    xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
-
-    if (success) {
-      isL1MessageExecuted[_xDomainCalldataHash] = true;
-      emit RelayedMessage(_xDomainCalldataHash);
-    } else {
-      unchecked {
-        uint256 _failedTimes = l1MessageFailedTimes[_xDomainCalldataHash] + 1;
-        require(_failedTimes <= maxFailedExecutionTimes, "Exceed maximum failure times");
-        l1MessageFailedTimes[_xDomainCalldataHash] = _failedTimes;
-      }
-      emit FailedRelayedMessage(_xDomainCalldataHash);
+    /// @inheritdoc IScrollMessenger
+    function sendMessage(
+        address _to,
+        uint256 _value,
+        bytes calldata _message,
+        uint256 _gasLimit,
+        address _refundAddress
+    ) external payable override whenNotPaused {
+        _sendMessage(_to, _value, _message, _gasLimit, _refundAddress);
+    }
+
+    /// @inheritdoc IL2ScrollMessenger
+    function relayMessage(
+        address _from,
+        address _to,
+        uint256 _value,
+        uint256 _nonce,
+        bytes memory _message
+    ) external override whenNotPaused onlyWhitelistedSender(msg.sender) {
+        // anti reentrance
+        require(
+            xDomainMessageSender == ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER,
+            "Message is already in execution"
+        );
+
+        // @todo address unalis to check sender is L1ScrollMessenger
+
+        bytes32 _xDomainCalldataHash = keccak256(_encodeXDomainCalldata(_from, _to, _value, _nonce, _message));
+
+        require(!isL1MessageExecuted[_xDomainCalldataHash], "Message was already successfully executed");
+
+        _executeMessage(_from, _to, _value, _message, _xDomainCalldataHash);
+    }
+
+    /// @inheritdoc IL2ScrollMessenger
+    function retryMessageWithProof(
+        address _from,
+        address _to,
+        uint256 _value,
+        uint256 _nonce,
+        bytes memory _message,
+        L1MessageProof calldata _proof
+    ) external override whenNotPaused {
+        // anti reentrance
+        require(xDomainMessageSender == ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER, "Already in execution");
+
+        // check message status
+        bytes32 _xDomainCalldataHash = keccak256(_encodeXDomainCalldata(_from, _to, _value, _nonce, _message));
+        require(!isL1MessageExecuted[_xDomainCalldataHash], "Message successfully executed");
+        require(l1MessageFailedTimes[_xDomainCalldataHash] > 0, "Message not relayed before");
+
+        require(
+            verifyMessageInclusionStatus(_proof.blockHash, _xDomainCalldataHash, _proof.stateRootProof),
+            "Message not included"
+        );
+
+        _executeMessage(_from, _to, _value, _message, _xDomainCalldataHash);
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Pause the contract
+    /// @dev This function can only called by contract owner.
+    /// @param _status The pause status to update.
+    function setPause(bool _status) external onlyOwner {
+        if (_status) {
+            _pause();
+        } else {
+            _unpause();
+        }
+    }
+
+    function updateMaxFailedExecutionTimes(uint256 _maxFailedExecutionTimes) external onlyOwner {
+        maxFailedExecutionTimes = _maxFailedExecutionTimes;
+
+        emit UpdateMaxFailedExecutionTimes(_maxFailedExecutionTimes);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    function _sendMessage(
+        address _to,
+        uint256 _value,
+        bytes memory _message,
+        uint256 _gasLimit,
+        address _refundAddress
+    ) internal nonReentrant {
+        // by pass fee vault relay
+        if (feeVault != msg.sender) {
+            require(_gasLimit >= MIN_GAS_LIMIT, "gas limit too small");
+        }
+
+        // compute and deduct the messaging fee to fee vault.
+        uint256 _fee = _gasLimit * IL1GasPriceOracle(gasOracle).l1BaseFee();
+        require(msg.value >= _value + _fee, "Insufficient msg.value");
+        if (_fee > 0) {
+            (bool _success, ) = feeVault.call{value: _fee}("");
+            require(_success, "Failed to deduct the fee");
+        }
+
+        uint256 _nonce = L2MessageQueue(messageQueue).nextMessageIndex();
+        bytes32 _xDomainCalldataHash = keccak256(_encodeXDomainCalldata(msg.sender, _to, _value, _nonce, _message));
+
+        // normally this won't happen, since each message has different nonce, but just in case.
+        require(!isL2MessageSent[_xDomainCalldataHash], "Duplicated message");
+        isL2MessageSent[_xDomainCalldataHash] = true;
+
+        L2MessageQueue(messageQueue).appendMessage(_xDomainCalldataHash);
+
+        emit SentMessage(msg.sender, _to, _value, _nonce, _gasLimit, _message);
+
+        // refund fee to tx.origin
+        unchecked {
+            uint256 _refund = msg.value - _fee - _value;
+            if (_refund > 0) {
+                (bool _success, ) = _refundAddress.call{value: _refund}("");
+                require(_success, "Failed to refund the fee");
+            }
+        }
+    }
+
+    function _executeMessage(
+        address _from,
+        address _to,
+        uint256 _value,
+        bytes memory _message,
+        bytes32 _xDomainCalldataHash
+    ) internal {
+        // @todo check more `_to` address to avoid attack.
+        require(_to != messageQueue, "Forbid to call message queue");
+        require(_to != address(this), "Forbid to call self");
+
+        // @note This usually will never happen, just in case.
+        require(_from != xDomainMessageSender, "Invalid message sender");
+
+        xDomainMessageSender = _from;
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool success, ) = _to.call{value: _value}(_message);
+        // reset value to refund gas.
+        xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
+
+        if (success) {
+            isL1MessageExecuted[_xDomainCalldataHash] = true;
+            emit RelayedMessage(_xDomainCalldataHash);
+        } else {
+            unchecked {
+                uint256 _failedTimes = l1MessageFailedTimes[_xDomainCalldataHash] + 1;
+                require(_failedTimes <= maxFailedExecutionTimes, "Exceed maximum failure times");
+                l1MessageFailedTimes[_xDomainCalldataHash] = _failedTimes;
+            }
+            emit FailedRelayedMessage(_xDomainCalldataHash);
+        }
     }
-  }
 }

contracts/src/L2/gateways/IL2ERC1155Gateway.sol

@@ -4,165 +4,165 @@ pragma solidity ^0.8.0;
 
 /// @title The interface for the ERC1155 cross chain gateway in layer 2.
 interface IL2ERC1155Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when the ERC1155 NFT is transfered to recipient in layer 2.
-  /// @param l1Token The address of ERC1155 NFT in layer 1.
-  /// @param l2Token The address of ERC1155 NFT in layer 2.
-  /// @param from The address of sender in layer 1.
-  /// @param to The address of recipient in layer 2.
-  /// @param tokenId The token id of the ERC1155 NFT deposited in layer 1.
-  /// @param amount The amount of token deposited.
-  event FinalizeDepositERC1155(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256 tokenId,
-    uint256 amount
-  );
+    /// @notice Emitted when the ERC1155 NFT is transfered to recipient in layer 2.
+    /// @param l1Token The address of ERC1155 NFT in layer 1.
+    /// @param l2Token The address of ERC1155 NFT in layer 2.
+    /// @param from The address of sender in layer 1.
+    /// @param to The address of recipient in layer 2.
+    /// @param tokenId The token id of the ERC1155 NFT deposited in layer 1.
+    /// @param amount The amount of token deposited.
+    event FinalizeDepositERC1155(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256 tokenId,
+        uint256 amount
+    );
 
-  /// @notice Emitted when the ERC1155 NFT is batch transfered to recipient in layer 2.
-  /// @param l1Token The address of ERC1155 NFT in layer 1.
-  /// @param l2Token The address of ERC1155 NFT in layer 2.
-  /// @param from The address of sender in layer 1.
-  /// @param to The address of recipient in layer 2.
-  /// @param tokenIds The list of token ids of the ERC1155 NFT deposited in layer 1.
-  /// @param amounts The list of corresponding amounts deposited.
-  event FinalizeBatchDepositERC1155(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256[] tokenIds,
-    uint256[] amounts
-  );
+    /// @notice Emitted when the ERC1155 NFT is batch transfered to recipient in layer 2.
+    /// @param l1Token The address of ERC1155 NFT in layer 1.
+    /// @param l2Token The address of ERC1155 NFT in layer 2.
+    /// @param from The address of sender in layer 1.
+    /// @param to The address of recipient in layer 2.
+    /// @param tokenIds The list of token ids of the ERC1155 NFT deposited in layer 1.
+    /// @param amounts The list of corresponding amounts deposited.
+    event FinalizeBatchDepositERC1155(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256[] tokenIds,
+        uint256[] amounts
+    );
 
-  /// @notice Emitted when the ERC1155 NFT is transfered to gateway in layer 2.
-  /// @param l1Token The address of ERC1155 NFT in layer 1.
-  /// @param l2Token The address of ERC1155 NFT in layer 2.
-  /// @param from The address of sender in layer 2.
-  /// @param to The address of recipient in layer 1.
-  /// @param tokenId The token id of the ERC1155 NFT to withdraw in layer 2.
-  /// @param amount The amount of token to withdraw.
-  event WithdrawERC1155(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256 tokenId,
-    uint256 amount
-  );
+    /// @notice Emitted when the ERC1155 NFT is transfered to gateway in layer 2.
+    /// @param l1Token The address of ERC1155 NFT in layer 1.
+    /// @param l2Token The address of ERC1155 NFT in layer 2.
+    /// @param from The address of sender in layer 2.
+    /// @param to The address of recipient in layer 1.
+    /// @param tokenId The token id of the ERC1155 NFT to withdraw in layer 2.
+    /// @param amount The amount of token to withdraw.
+    event WithdrawERC1155(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256 tokenId,
+        uint256 amount
+    );
 
-  /// @notice Emitted when the ERC1155 NFT is batch transfered to gateway in layer 2.
-  /// @param l1Token The address of ERC1155 NFT in layer 1.
-  /// @param l2Token The address of ERC1155 NFT in layer 2.
-  /// @param from The address of sender in layer 2.
-  /// @param to The address of recipient in layer 1.
-  /// @param tokenIds The list of token ids of the ERC1155 NFT to withdraw in layer 2.
-  /// @param amounts The list of corresponding amounts to withdraw.
-  event BatchWithdrawERC1155(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256[] tokenIds,
-    uint256[] amounts
-  );
+    /// @notice Emitted when the ERC1155 NFT is batch transfered to gateway in layer 2.
+    /// @param l1Token The address of ERC1155 NFT in layer 1.
+    /// @param l2Token The address of ERC1155 NFT in layer 2.
+    /// @param from The address of sender in layer 2.
+    /// @param to The address of recipient in layer 1.
+    /// @param tokenIds The list of token ids of the ERC1155 NFT to withdraw in layer 2.
+    /// @param amounts The list of corresponding amounts to withdraw.
+    event BatchWithdrawERC1155(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256[] tokenIds,
+        uint256[] amounts
+    );
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Withdraw some ERC1155 NFT to caller's account on layer 1.
-  /// @param token The address of ERC1155 NFT in layer 2.
-  /// @param tokenId The token id to withdraw.
-  /// @param amount The amount of token to withdraw.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function withdrawERC1155(
-    address token,
-    uint256 tokenId,
-    uint256 amount,
-    uint256 gasLimit
-  ) external;
+    /// @notice Withdraw some ERC1155 NFT to caller's account on layer 1.
+    /// @param token The address of ERC1155 NFT in layer 2.
+    /// @param tokenId The token id to withdraw.
+    /// @param amount The amount of token to withdraw.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function withdrawERC1155(
+        address token,
+        uint256 tokenId,
+        uint256 amount,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Withdraw some ERC1155 NFT to caller's account on layer 1.
-  /// @param token The address of ERC1155 NFT in layer 2.
-  /// @param to The address of recipient in layer 1.
-  /// @param tokenId The token id to withdraw.
-  /// @param amount The amount of token to withdraw.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function withdrawERC1155(
-    address token,
-    address to,
-    uint256 tokenId,
-    uint256 amount,
-    uint256 gasLimit
-  ) external;
+    /// @notice Withdraw some ERC1155 NFT to caller's account on layer 1.
+    /// @param token The address of ERC1155 NFT in layer 2.
+    /// @param to The address of recipient in layer 1.
+    /// @param tokenId The token id to withdraw.
+    /// @param amount The amount of token to withdraw.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function withdrawERC1155(
+        address token,
+        address to,
+        uint256 tokenId,
+        uint256 amount,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Batch withdraw a list of ERC1155 NFT to caller's account on layer 1.
-  /// @param token The address of ERC1155 NFT in layer 2.
-  /// @param tokenIds The list of token ids to withdraw.
-  /// @param amounts The list of corresponding amounts to withdraw.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function batchWithdrawERC1155(
-    address token,
-    uint256[] memory tokenIds,
-    uint256[] memory amounts,
-    uint256 gasLimit
-  ) external;
+    /// @notice Batch withdraw a list of ERC1155 NFT to caller's account on layer 1.
+    /// @param token The address of ERC1155 NFT in layer 2.
+    /// @param tokenIds The list of token ids to withdraw.
+    /// @param amounts The list of corresponding amounts to withdraw.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function batchWithdrawERC1155(
+        address token,
+        uint256[] memory tokenIds,
+        uint256[] memory amounts,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Batch withdraw a list of ERC1155 NFT to caller's account on layer 1.
-  /// @param token The address of ERC1155 NFT in layer 2.
-  /// @param to The address of recipient in layer 1.
-  /// @param tokenIds The list of token ids to withdraw.
-  /// @param amounts The list of corresponding amounts to withdraw.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function batchWithdrawERC1155(
-    address token,
-    address to,
-    uint256[] memory tokenIds,
-    uint256[] memory amounts,
-    uint256 gasLimit
-  ) external;
+    /// @notice Batch withdraw a list of ERC1155 NFT to caller's account on layer 1.
+    /// @param token The address of ERC1155 NFT in layer 2.
+    /// @param to The address of recipient in layer 1.
+    /// @param tokenIds The list of token ids to withdraw.
+    /// @param amounts The list of corresponding amounts to withdraw.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function batchWithdrawERC1155(
+        address token,
+        address to,
+        uint256[] memory tokenIds,
+        uint256[] memory amounts,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Complete ERC1155 deposit from layer 1 to layer 2 and send NFT to recipient's account in layer 2.
-  /// @dev Requirements:
-  ///  - The function should only be called by L2ScrollMessenger.
-  ///  - The function should also only be called by L1ERC1155Gateway in layer 1.
-  /// @param l1Token The address of corresponding layer 1 token.
-  /// @param l2Token The address of corresponding layer 2 token.
-  /// @param from The address of account who deposits the token in layer 1.
-  /// @param to The address of recipient in layer 2 to receive the token.
-  /// @param tokenId The token id to deposit.
-  /// @param amount The amount of token to deposit.
-  function finalizeDepositERC1155(
-    address l1Token,
-    address l2Token,
-    address from,
-    address to,
-    uint256 tokenId,
-    uint256 amount
-  ) external;
+    /// @notice Complete ERC1155 deposit from layer 1 to layer 2 and send NFT to recipient's account in layer 2.
+    /// @dev Requirements:
+    ///  - The function should only be called by L2ScrollMessenger.
+    ///  - The function should also only be called by L1ERC1155Gateway in layer 1.
+    /// @param l1Token The address of corresponding layer 1 token.
+    /// @param l2Token The address of corresponding layer 2 token.
+    /// @param from The address of account who deposits the token in layer 1.
+    /// @param to The address of recipient in layer 2 to receive the token.
+    /// @param tokenId The token id to deposit.
+    /// @param amount The amount of token to deposit.
+    function finalizeDepositERC1155(
+        address l1Token,
+        address l2Token,
+        address from,
+        address to,
+        uint256 tokenId,
+        uint256 amount
+    ) external;
 
-  /// @notice Complete ERC1155 deposit from layer 1 to layer 2 and send NFT to recipient's account in layer 2.
-  /// @dev Requirements:
-  ///  - The function should only be called by L2ScrollMessenger.
-  ///  - The function should also only be called by L1ERC1155Gateway in layer 1.
-  /// @param l1Token The address of corresponding layer 1 token.
-  /// @param l2Token The address of corresponding layer 2 token.
-  /// @param from The address of account who deposits the token in layer 1.
-  /// @param to The address of recipient in layer 2 to receive the token.
-  /// @param tokenIds The list of token ids to deposit.
-  /// @param amounts The list of corresponding amounts to deposit.
-  function finalizeBatchDepositERC1155(
-    address l1Token,
-    address l2Token,
-    address from,
-    address to,
-    uint256[] calldata tokenIds,
-    uint256[] calldata amounts
-  ) external;
+    /// @notice Complete ERC1155 deposit from layer 1 to layer 2 and send NFT to recipient's account in layer 2.
+    /// @dev Requirements:
+    ///  - The function should only be called by L2ScrollMessenger.
+    ///  - The function should also only be called by L1ERC1155Gateway in layer 1.
+    /// @param l1Token The address of corresponding layer 1 token.
+    /// @param l2Token The address of corresponding layer 2 token.
+    /// @param from The address of account who deposits the token in layer 1.
+    /// @param to The address of recipient in layer 2 to receive the token.
+    /// @param tokenIds The list of token ids to deposit.
+    /// @param amounts The list of corresponding amounts to deposit.
+    function finalizeBatchDepositERC1155(
+        address l1Token,
+        address l2Token,
+        address from,
+        address to,
+        uint256[] calldata tokenIds,
+        uint256[] calldata amounts
+    ) external;
 }

contracts/src/L2/gateways/IL2ERC20Gateway.sol

@@ -3,113 +3,113 @@
 pragma solidity ^0.8.0;
 
 interface IL2ERC20Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when ERC20 token is deposited from L1 to L2 and transfer to recipient.
-  /// @param l1Token The address of the token in L1.
-  /// @param l2Token The address of the token in L2.
-  /// @param from The address of sender in L1.
-  /// @param to The address of recipient in L2.
-  /// @param amount The amount of token withdrawn from L1 to L2.
-  /// @param data The optional calldata passed to recipient in L2.
-  event FinalizeDepositERC20(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256 amount,
-    bytes data
-  );
+    /// @notice Emitted when ERC20 token is deposited from L1 to L2 and transfer to recipient.
+    /// @param l1Token The address of the token in L1.
+    /// @param l2Token The address of the token in L2.
+    /// @param from The address of sender in L1.
+    /// @param to The address of recipient in L2.
+    /// @param amount The amount of token withdrawn from L1 to L2.
+    /// @param data The optional calldata passed to recipient in L2.
+    event FinalizeDepositERC20(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256 amount,
+        bytes data
+    );
 
-  /// @notice Emitted when someone withdraw ERC20 token from L2 to L1.
-  /// @param l1Token The address of the token in L1.
-  /// @param l2Token The address of the token in L2.
-  /// @param from The address of sender in L2.
-  /// @param to The address of recipient in L1.
-  /// @param amount The amount of token will be deposited from L2 to L1.
-  /// @param data The optional calldata passed to recipient in L1.
-  event WithdrawERC20(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256 amount,
-    bytes data
-  );
+    /// @notice Emitted when someone withdraw ERC20 token from L2 to L1.
+    /// @param l1Token The address of the token in L1.
+    /// @param l2Token The address of the token in L2.
+    /// @param from The address of sender in L2.
+    /// @param to The address of recipient in L1.
+    /// @param amount The amount of token will be deposited from L2 to L1.
+    /// @param data The optional calldata passed to recipient in L1.
+    event WithdrawERC20(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256 amount,
+        bytes data
+    );
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Return the corresponding l1 token address given l2 token address.
-  /// @param l2Token The address of l2 token.
-  function getL1ERC20Address(address l2Token) external view returns (address);
+    /// @notice Return the corresponding l1 token address given l2 token address.
+    /// @param l2Token The address of l2 token.
+    function getL1ERC20Address(address l2Token) external view returns (address);
 
-  /// @notice Return the corresponding l2 token address given l1 token address.
-  /// @param l1Token The address of l1 token.
-  function getL2ERC20Address(address l1Token) external view returns (address);
+    /// @notice Return the corresponding l2 token address given l1 token address.
+    /// @param l1Token The address of l1 token.
+    function getL2ERC20Address(address l1Token) external view returns (address);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Withdraw of some token to a caller's account on L1.
-  /// @dev Make this function payable to send relayer fee in Ether.
-  /// @param token The address of token in L2.
-  /// @param amount The amount of token to transfer.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function withdrawERC20(
-    address token,
-    uint256 amount,
-    uint256 gasLimit
-  ) external payable;
+    /// @notice Withdraw of some token to a caller's account on L1.
+    /// @dev Make this function payable to send relayer fee in Ether.
+    /// @param token The address of token in L2.
+    /// @param amount The amount of token to transfer.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function withdrawERC20(
+        address token,
+        uint256 amount,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Withdraw of some token to a recipient's account on L1.
-  /// @dev Make this function payable to send relayer fee in Ether.
-  /// @param token The address of token in L2.
-  /// @param to The address of recipient's account on L1.
-  /// @param amount The amount of token to transfer.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function withdrawERC20(
-    address token,
-    address to,
-    uint256 amount,
-    uint256 gasLimit
-  ) external payable;
+    /// @notice Withdraw of some token to a recipient's account on L1.
+    /// @dev Make this function payable to send relayer fee in Ether.
+    /// @param token The address of token in L2.
+    /// @param to The address of recipient's account on L1.
+    /// @param amount The amount of token to transfer.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function withdrawERC20(
+        address token,
+        address to,
+        uint256 amount,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Withdraw of some token to a recipient's account on L1 and call.
-  /// @dev Make this function payable to send relayer fee in Ether.
-  /// @param token The address of token in L2.
-  /// @param to The address of recipient's account on L1.
-  /// @param amount The amount of token to transfer.
-  /// @param data Optional data to forward to recipient's account.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function withdrawERC20AndCall(
-    address token,
-    address to,
-    uint256 amount,
-    bytes calldata data,
-    uint256 gasLimit
-  ) external payable;
+    /// @notice Withdraw of some token to a recipient's account on L1 and call.
+    /// @dev Make this function payable to send relayer fee in Ether.
+    /// @param token The address of token in L2.
+    /// @param to The address of recipient's account on L1.
+    /// @param amount The amount of token to transfer.
+    /// @param data Optional data to forward to recipient's account.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function withdrawERC20AndCall(
+        address token,
+        address to,
+        uint256 amount,
+        bytes calldata data,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Complete a deposit from L1 to L2 and send fund to recipient's account in L2.
-  /// @dev Make this function payable to handle WETH deposit/withdraw.
-  ///      The function should only be called by L2ScrollMessenger.
-  ///      The function should also only be called by L1ERC20Gateway in L1.
-  /// @param l1Token The address of corresponding L1 token.
-  /// @param l2Token The address of corresponding L2 token.
-  /// @param from The address of account who deposits the token in L1.
-  /// @param to The address of recipient in L2 to receive the token.
-  /// @param amount The amount of the token to deposit.
-  /// @param data Optional data to forward to recipient's account.
-  function finalizeDepositERC20(
-    address l1Token,
-    address l2Token,
-    address from,
-    address to,
-    uint256 amount,
-    bytes calldata data
-  ) external payable;
+    /// @notice Complete a deposit from L1 to L2 and send fund to recipient's account in L2.
+    /// @dev Make this function payable to handle WETH deposit/withdraw.
+    ///      The function should only be called by L2ScrollMessenger.
+    ///      The function should also only be called by L1ERC20Gateway in L1.
+    /// @param l1Token The address of corresponding L1 token.
+    /// @param l2Token The address of corresponding L2 token.
+    /// @param from The address of account who deposits the token in L1.
+    /// @param to The address of recipient in L2 to receive the token.
+    /// @param amount The amount of the token to deposit.
+    /// @param data Optional data to forward to recipient's account.
+    function finalizeDepositERC20(
+        address l1Token,
+        address l2Token,
+        address from,
+        address to,
+        uint256 amount,
+        bytes calldata data
+    ) external payable;
 }

contracts/src/L2/gateways/IL2ERC721Gateway.sol

@@ -4,145 +4,145 @@ pragma solidity ^0.8.0;
 
 /// @title The interface for the ERC721 cross chain gateway in layer 2.
 interface IL2ERC721Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when the ERC721 NFT is transfered to recipient in layer 2.
-  /// @param l1Token The address of ERC721 NFT in layer 1.
-  /// @param l2Token The address of ERC721 NFT in layer 2.
-  /// @param from The address of sender in layer 1.
-  /// @param to The address of recipient in layer 2.
-  /// @param tokenId The token id of the ERC721 NFT deposited in layer 1.
-  event FinalizeDepositERC721(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256 tokenId
-  );
+    /// @notice Emitted when the ERC721 NFT is transfered to recipient in layer 2.
+    /// @param l1Token The address of ERC721 NFT in layer 1.
+    /// @param l2Token The address of ERC721 NFT in layer 2.
+    /// @param from The address of sender in layer 1.
+    /// @param to The address of recipient in layer 2.
+    /// @param tokenId The token id of the ERC721 NFT deposited in layer 1.
+    event FinalizeDepositERC721(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256 tokenId
+    );
 
-  /// @notice Emitted when the ERC721 NFT is batch transfered to recipient in layer 2.
-  /// @param l1Token The address of ERC721 NFT in layer 1.
-  /// @param l2Token The address of ERC721 NFT in layer 2.
-  /// @param from The address of sender in layer 1.
-  /// @param to The address of recipient in layer 2.
-  /// @param tokenIds The list of token ids of the ERC721 NFT deposited in layer 1.
-  event FinalizeBatchDepositERC721(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256[] tokenIds
-  );
+    /// @notice Emitted when the ERC721 NFT is batch transfered to recipient in layer 2.
+    /// @param l1Token The address of ERC721 NFT in layer 1.
+    /// @param l2Token The address of ERC721 NFT in layer 2.
+    /// @param from The address of sender in layer 1.
+    /// @param to The address of recipient in layer 2.
+    /// @param tokenIds The list of token ids of the ERC721 NFT deposited in layer 1.
+    event FinalizeBatchDepositERC721(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256[] tokenIds
+    );
 
-  /// @notice Emitted when the ERC721 NFT is transfered to gateway in layer 2.
-  /// @param l1Token The address of ERC721 NFT in layer 1.
-  /// @param l2Token The address of ERC721 NFT in layer 2.
-  /// @param from The address of sender in layer 2.
-  /// @param to The address of recipient in layer 1.
-  /// @param tokenId The token id of the ERC721 NFT to withdraw in layer 2.
-  event WithdrawERC721(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256 tokenId
-  );
+    /// @notice Emitted when the ERC721 NFT is transfered to gateway in layer 2.
+    /// @param l1Token The address of ERC721 NFT in layer 1.
+    /// @param l2Token The address of ERC721 NFT in layer 2.
+    /// @param from The address of sender in layer 2.
+    /// @param to The address of recipient in layer 1.
+    /// @param tokenId The token id of the ERC721 NFT to withdraw in layer 2.
+    event WithdrawERC721(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256 tokenId
+    );
 
-  /// @notice Emitted when the ERC721 NFT is batch transfered to gateway in layer 2.
-  /// @param l1Token The address of ERC721 NFT in layer 1.
-  /// @param l2Token The address of ERC721 NFT in layer 2.
-  /// @param from The address of sender in layer 2.
-  /// @param to The address of recipient in layer 1.
-  /// @param tokenIds The list of token ids of the ERC721 NFT to withdraw in layer 2.
-  event BatchWithdrawERC721(
-    address indexed l1Token,
-    address indexed l2Token,
-    address indexed from,
-    address to,
-    uint256[] tokenIds
-  );
+    /// @notice Emitted when the ERC721 NFT is batch transfered to gateway in layer 2.
+    /// @param l1Token The address of ERC721 NFT in layer 1.
+    /// @param l2Token The address of ERC721 NFT in layer 2.
+    /// @param from The address of sender in layer 2.
+    /// @param to The address of recipient in layer 1.
+    /// @param tokenIds The list of token ids of the ERC721 NFT to withdraw in layer 2.
+    event BatchWithdrawERC721(
+        address indexed l1Token,
+        address indexed l2Token,
+        address indexed from,
+        address to,
+        uint256[] tokenIds
+    );
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Withdraw some ERC721 NFT to caller's account on layer 1.
-  /// @param token The address of ERC721 NFT in layer 2.
-  /// @param tokenId The token id to withdraw.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function withdrawERC721(
-    address token,
-    uint256 tokenId,
-    uint256 gasLimit
-  ) external;
+    /// @notice Withdraw some ERC721 NFT to caller's account on layer 1.
+    /// @param token The address of ERC721 NFT in layer 2.
+    /// @param tokenId The token id to withdraw.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function withdrawERC721(
+        address token,
+        uint256 tokenId,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Withdraw some ERC721 NFT to caller's account on layer 1.
-  /// @param token The address of ERC721 NFT in layer 2.
-  /// @param to The address of recipient in layer 1.
-  /// @param tokenId The token id to withdraw.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function withdrawERC721(
-    address token,
-    address to,
-    uint256 tokenId,
-    uint256 gasLimit
-  ) external;
+    /// @notice Withdraw some ERC721 NFT to caller's account on layer 1.
+    /// @param token The address of ERC721 NFT in layer 2.
+    /// @param to The address of recipient in layer 1.
+    /// @param tokenId The token id to withdraw.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function withdrawERC721(
+        address token,
+        address to,
+        uint256 tokenId,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Batch withdraw a list of ERC721 NFT to caller's account on layer 1.
-  /// @param token The address of ERC721 NFT in layer 2.
-  /// @param tokenIds The list of token ids to withdraw.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function batchWithdrawERC721(
-    address token,
-    uint256[] memory tokenIds,
-    uint256 gasLimit
-  ) external;
+    /// @notice Batch withdraw a list of ERC721 NFT to caller's account on layer 1.
+    /// @param token The address of ERC721 NFT in layer 2.
+    /// @param tokenIds The list of token ids to withdraw.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function batchWithdrawERC721(
+        address token,
+        uint256[] memory tokenIds,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Batch withdraw a list of ERC721 NFT to caller's account on layer 1.
-  /// @param token The address of ERC721 NFT in layer 2.
-  /// @param to The address of recipient in layer 1.
-  /// @param tokenIds The list of token ids to withdraw.
-  /// @param gasLimit Unused, but included for potential forward compatibility considerations.
-  function batchWithdrawERC721(
-    address token,
-    address to,
-    uint256[] memory tokenIds,
-    uint256 gasLimit
-  ) external;
+    /// @notice Batch withdraw a list of ERC721 NFT to caller's account on layer 1.
+    /// @param token The address of ERC721 NFT in layer 2.
+    /// @param to The address of recipient in layer 1.
+    /// @param tokenIds The list of token ids to withdraw.
+    /// @param gasLimit Unused, but included for potential forward compatibility considerations.
+    function batchWithdrawERC721(
+        address token,
+        address to,
+        uint256[] memory tokenIds,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Complete ERC721 deposit from layer 1 to layer 2 and send NFT to recipient's account in layer 2.
-  /// @dev Requirements:
-  ///  - The function should only be called by L2ScrollMessenger.
-  ///  - The function should also only be called by L1ERC721Gateway in layer 1.
-  /// @param l1Token The address of corresponding layer 1 token.
-  /// @param l2Token The address of corresponding layer 2 token.
-  /// @param from The address of account who withdraw the token in layer 1.
-  /// @param to The address of recipient in layer 2 to receive the token.
-  /// @param tokenId The token id to withdraw.
-  function finalizeDepositERC721(
-    address l1Token,
-    address l2Token,
-    address from,
-    address to,
-    uint256 tokenId
-  ) external;
+    /// @notice Complete ERC721 deposit from layer 1 to layer 2 and send NFT to recipient's account in layer 2.
+    /// @dev Requirements:
+    ///  - The function should only be called by L2ScrollMessenger.
+    ///  - The function should also only be called by L1ERC721Gateway in layer 1.
+    /// @param l1Token The address of corresponding layer 1 token.
+    /// @param l2Token The address of corresponding layer 2 token.
+    /// @param from The address of account who withdraw the token in layer 1.
+    /// @param to The address of recipient in layer 2 to receive the token.
+    /// @param tokenId The token id to withdraw.
+    function finalizeDepositERC721(
+        address l1Token,
+        address l2Token,
+        address from,
+        address to,
+        uint256 tokenId
+    ) external;
 
-  /// @notice Complete ERC721 deposit from layer 1 to layer 2 and send NFT to recipient's account in layer 2.
-  /// @dev Requirements:
-  ///  - The function should only be called by L2ScrollMessenger.
-  ///  - The function should also only be called by L1ERC721Gateway in layer 1.
-  /// @param l1Token The address of corresponding layer 1 token.
-  /// @param l2Token The address of corresponding layer 2 token.
-  /// @param from The address of account who withdraw the token in layer 1.
-  /// @param to The address of recipient in layer 2 to receive the token.
-  /// @param tokenIds The list of token ids to withdraw.
-  function finalizeBatchDepositERC721(
-    address l1Token,
-    address l2Token,
-    address from,
-    address to,
-    uint256[] calldata tokenIds
-  ) external;
+    /// @notice Complete ERC721 deposit from layer 1 to layer 2 and send NFT to recipient's account in layer 2.
+    /// @dev Requirements:
+    ///  - The function should only be called by L2ScrollMessenger.
+    ///  - The function should also only be called by L1ERC721Gateway in layer 1.
+    /// @param l1Token The address of corresponding layer 1 token.
+    /// @param l2Token The address of corresponding layer 2 token.
+    /// @param from The address of account who withdraw the token in layer 1.
+    /// @param to The address of recipient in layer 2 to receive the token.
+    /// @param tokenIds The list of token ids to withdraw.
+    function finalizeBatchDepositERC721(
+        address l1Token,
+        address l2Token,
+        address from,
+        address to,
+        uint256[] calldata tokenIds
+    ) external;
 }

contracts/src/L2/gateways/IL2ETHGateway.sol

@@ -3,66 +3,66 @@
 pragma solidity ^0.8.0;
 
 interface IL2ETHGateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when someone withdraw ETH from L2 to L1.
-  /// @param from The address of sender in L2.
-  /// @param to The address of recipient in L1.
-  /// @param amount The amount of ETH will be deposited from L2 to L1.
-  /// @param data The optional calldata passed to recipient in L1.
-  event WithdrawETH(address indexed from, address indexed to, uint256 amount, bytes data);
+    /// @notice Emitted when someone withdraw ETH from L2 to L1.
+    /// @param from The address of sender in L2.
+    /// @param to The address of recipient in L1.
+    /// @param amount The amount of ETH will be deposited from L2 to L1.
+    /// @param data The optional calldata passed to recipient in L1.
+    event WithdrawETH(address indexed from, address indexed to, uint256 amount, bytes data);
 
-  /// @notice Emitted when ETH is deposited from L1 to L2 and transfer to recipient.
-  /// @param from The address of sender in L1.
-  /// @param to The address of recipient in L2.
-  /// @param amount The amount of ETH deposited from L1 to L2.
-  /// @param data The optional calldata passed to recipient in L2.
-  event FinalizeDepositETH(address indexed from, address indexed to, uint256 amount, bytes data);
+    /// @notice Emitted when ETH is deposited from L1 to L2 and transfer to recipient.
+    /// @param from The address of sender in L1.
+    /// @param to The address of recipient in L2.
+    /// @param amount The amount of ETH deposited from L1 to L2.
+    /// @param data The optional calldata passed to recipient in L2.
+    event FinalizeDepositETH(address indexed from, address indexed to, uint256 amount, bytes data);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Withdraw ETH to caller's account in L1.
-  /// @param amount The amount of ETH to be withdrawn.
-  /// @param gasLimit Optional, gas limit used to complete the withdraw on L1.
-  function withdrawETH(uint256 amount, uint256 gasLimit) external payable;
+    /// @notice Withdraw ETH to caller's account in L1.
+    /// @param amount The amount of ETH to be withdrawn.
+    /// @param gasLimit Optional, gas limit used to complete the withdraw on L1.
+    function withdrawETH(uint256 amount, uint256 gasLimit) external payable;
 
-  /// @notice Withdraw ETH to caller's account in L1.
-  /// @param to The address of recipient's account on L1.
-  /// @param amount The amount of ETH to be withdrawn.
-  /// @param gasLimit Optional, gas limit used to complete the withdraw on L1.
-  function withdrawETH(
-    address to,
-    uint256 amount,
-    uint256 gasLimit
-  ) external payable;
+    /// @notice Withdraw ETH to caller's account in L1.
+    /// @param to The address of recipient's account on L1.
+    /// @param amount The amount of ETH to be withdrawn.
+    /// @param gasLimit Optional, gas limit used to complete the withdraw on L1.
+    function withdrawETH(
+        address to,
+        uint256 amount,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Withdraw ETH to caller's account in L1.
-  /// @param to The address of recipient's account on L1.
-  /// @param amount The amount of ETH to be withdrawn.
-  /// @param data Optional data to forward to recipient's account.
-  /// @param gasLimit Optional, gas limit used to complete the withdraw on L1.
-  function withdrawETHAndCall(
-    address to,
-    uint256 amount,
-    bytes calldata data,
-    uint256 gasLimit
-  ) external payable;
+    /// @notice Withdraw ETH to caller's account in L1.
+    /// @param to The address of recipient's account on L1.
+    /// @param amount The amount of ETH to be withdrawn.
+    /// @param data Optional data to forward to recipient's account.
+    /// @param gasLimit Optional, gas limit used to complete the withdraw on L1.
+    function withdrawETHAndCall(
+        address to,
+        uint256 amount,
+        bytes calldata data,
+        uint256 gasLimit
+    ) external payable;
 
-  /// @notice Complete ETH deposit from L1 to L2 and send fund to recipient's account in L2.
-  /// @dev This function should only be called by L2ScrollMessenger.
-  ///      This function should also only be called by L1GatewayRouter in L1.
-  /// @param _from The address of account who deposit ETH in L1.
-  /// @param _to The address of recipient in L2 to receive ETH.
-  /// @param _amount The amount of ETH to deposit.
-  /// @param _data Optional data to forward to recipient's account.
-  function finalizeDepositETH(
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable;
+    /// @notice Complete ETH deposit from L1 to L2 and send fund to recipient's account in L2.
+    /// @dev This function should only be called by L2ScrollMessenger.
+    ///      This function should also only be called by L1GatewayRouter in L1.
+    /// @param _from The address of account who deposit ETH in L1.
+    /// @param _to The address of recipient in L2 to receive ETH.
+    /// @param _amount The amount of ETH to deposit.
+    /// @param _data Optional data to forward to recipient's account.
+    function finalizeDepositETH(
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable;
 }

contracts/src/L2/gateways/IL2GatewayRouter.sol

@@ -2,24 +2,24 @@
 
 pragma solidity ^0.8.0;
 
-import { IL2ETHGateway } from "./IL2ETHGateway.sol";
-import { IL2ERC20Gateway } from "./IL2ERC20Gateway.sol";
+import {IL2ETHGateway} from "./IL2ETHGateway.sol";
+import {IL2ERC20Gateway} from "./IL2ERC20Gateway.sol";
 
 interface IL2GatewayRouter is IL2ETHGateway, IL2ERC20Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when the address of ETH Gateway is updated.
-  /// @param ethGateway The address of new ETH Gateway.
-  event SetETHGateway(address indexed ethGateway);
+    /// @notice Emitted when the address of ETH Gateway is updated.
+    /// @param ethGateway The address of new ETH Gateway.
+    event SetETHGateway(address indexed ethGateway);
 
-  /// @notice Emitted when the address of default ERC20 Gateway is updated.
-  /// @param defaultERC20Gateway The address of new default ERC20 Gateway.
-  event SetDefaultERC20Gateway(address indexed defaultERC20Gateway);
+    /// @notice Emitted when the address of default ERC20 Gateway is updated.
+    /// @param defaultERC20Gateway The address of new default ERC20 Gateway.
+    event SetDefaultERC20Gateway(address indexed defaultERC20Gateway);
 
-  /// @notice Emitted when the `gateway` for `token` is updated.
-  /// @param token The address of token updated.
-  /// @param gateway The corresponding address of gateway updated.
-  event SetERC20Gateway(address indexed token, address indexed gateway);
+    /// @notice Emitted when the `gateway` for `token` is updated.
+    /// @param token The address of token updated.
+    /// @param gateway The corresponding address of gateway updated.
+    event SetERC20Gateway(address indexed token, address indexed gateway);
 }

contracts/src/L2/gateways/L2CustomERC20Gateway.sol

@@ -2,14 +2,14 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
-import { IERC20Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
 
-import { IL2ERC20Gateway, L2ERC20Gateway } from "./L2ERC20Gateway.sol";
-import { IL2ScrollMessenger } from "../IL2ScrollMessenger.sol";
-import { IL1ERC20Gateway } from "../../L1/gateways/IL1ERC20Gateway.sol";
-import { ScrollGatewayBase, IScrollGateway } from "../../libraries/gateway/ScrollGatewayBase.sol";
-import { IScrollStandardERC20 } from "../../libraries/token/IScrollStandardERC20.sol";
+import {IL2ERC20Gateway, L2ERC20Gateway} from "./L2ERC20Gateway.sol";
+import {IL2ScrollMessenger} from "../IL2ScrollMessenger.sol";
+import {IL1ERC20Gateway} from "../../L1/gateways/IL1ERC20Gateway.sol";
+import {ScrollGatewayBase, IScrollGateway} from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {IScrollStandardERC20} from "../../libraries/token/IScrollStandardERC20.sol";
 
 /// @title L2ERC20Gateway
 /// @notice The `L2ERC20Gateway` is used to withdraw custom ERC20 compatible tokens in layer 2 and
@@ -17,130 +17,130 @@ import { IScrollStandardERC20 } from "../../libraries/token/IScrollStandardERC20
 /// @dev The withdrawn tokens tokens will be burned directly. On finalizing deposit, the corresponding
 /// tokens will be minted and transfered to the recipient.
 contract L2CustomERC20Gateway is OwnableUpgradeable, ScrollGatewayBase, L2ERC20Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when token mapping for ERC20 token is updated.
-  /// @param _l2Token The address of corresponding ERC20 token in layer 2.
-  /// @param _l1Token The address of ERC20 token in layer 1.
-  event UpdateTokenMapping(address _l2Token, address _l1Token);
+    /// @notice Emitted when token mapping for ERC20 token is updated.
+    /// @param _l2Token The address of corresponding ERC20 token in layer 2.
+    /// @param _l1Token The address of ERC20 token in layer 1.
+    event UpdateTokenMapping(address _l2Token, address _l1Token);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from layer 2 token address to layer 1 token address for ERC20 token.
-  // solhint-disable-next-line var-name-mixedcase
-  mapping(address => address) public tokenMapping;
+    /// @notice Mapping from layer 2 token address to layer 1 token address for ERC20 token.
+    // solhint-disable-next-line var-name-mixedcase
+    mapping(address => address) public tokenMapping;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  function initialize(
-    address _counterpart,
-    address _router,
-    address _messenger
-  ) external initializer {
-    require(_router != address(0), "zero router address");
-    OwnableUpgradeable.__Ownable_init();
+    function initialize(
+        address _counterpart,
+        address _router,
+        address _messenger
+    ) external initializer {
+        require(_router != address(0), "zero router address");
+        OwnableUpgradeable.__Ownable_init();
 
-    ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL2ERC20Gateway
-  function getL1ERC20Address(address _l2Token) external view override returns (address) {
-    return tokenMapping[_l2Token];
-  }
-
-  /// @inheritdoc IL2ERC20Gateway
-  function getL2ERC20Address(address) public pure override returns (address) {
-    revert("unimplemented");
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL2ERC20Gateway
-  function finalizeDepositERC20(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable override onlyCallByCounterpart {
-    require(msg.value == 0, "nonzero msg.value");
-    require(_l1Token == tokenMapping[_l2Token], "l1 token mismatch");
-
-    // @todo forward `_callData` to `_to` using transferAndCall in the near future
-
-    IScrollStandardERC20(_l2Token).mint(_to, _amount);
-
-    emit FinalizeDepositERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
-  }
-
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Update layer 2 to layer 1 token mapping.
-  /// @param _l2Token The address of corresponding ERC20 token in layer 2.
-  /// @param _l1Token The address of ERC20 token in layer 1.
-  function updateTokenMapping(address _l2Token, address _l1Token) external onlyOwner {
-    require(_l1Token != address(0), "map to zero address");
-
-    tokenMapping[_l2Token] = _l1Token;
-
-    emit UpdateTokenMapping(_l2Token, _l1Token);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @inheritdoc L2ERC20Gateway
-  function _withdraw(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal virtual override {
-    address _l1Token = tokenMapping[_token];
-    require(_l1Token != address(0), "no corresponding l1 token");
-
-    require(_amount > 0, "withdraw zero amount");
-
-    // 1. Extract real sender if this call is from L2GatewayRouter.
-    address _from = msg.sender;
-    if (router == msg.sender) {
-      (_from, _data) = abi.decode(_data, (address, bytes));
+        ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
     }
 
-    // 2. Burn token.
-    IScrollStandardERC20(_token).burn(_from, _amount);
+    /*************************
+     * Public View Functions *
+     *************************/
 
-    // 3. Generate message passed to L1StandardERC20Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL1ERC20Gateway.finalizeWithdrawERC20.selector,
-      _l1Token,
-      _token,
-      _from,
-      _to,
-      _amount,
-      _data
-    );
+    /// @inheritdoc IL2ERC20Gateway
+    function getL1ERC20Address(address _l2Token) external view override returns (address) {
+        return tokenMapping[_l2Token];
+    }
 
-    // 4. send message to L2ScrollMessenger
-    IL2ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, 0, _message, _gasLimit);
+    /// @inheritdoc IL2ERC20Gateway
+    function getL2ERC20Address(address) public pure override returns (address) {
+        revert("unimplemented");
+    }
 
-    emit WithdrawERC20(_l1Token, _token, _from, _to, _amount, _data);
-  }
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
+
+    /// @inheritdoc IL2ERC20Gateway
+    function finalizeDepositERC20(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable override onlyCallByCounterpart {
+        require(msg.value == 0, "nonzero msg.value");
+        require(_l1Token == tokenMapping[_l2Token], "l1 token mismatch");
+
+        // @todo forward `_callData` to `_to` using transferAndCall in the near future
+
+        IScrollStandardERC20(_l2Token).mint(_to, _amount);
+
+        emit FinalizeDepositERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update layer 2 to layer 1 token mapping.
+    /// @param _l2Token The address of corresponding ERC20 token in layer 2.
+    /// @param _l1Token The address of ERC20 token in layer 1.
+    function updateTokenMapping(address _l2Token, address _l1Token) external onlyOwner {
+        require(_l1Token != address(0), "map to zero address");
+
+        tokenMapping[_l2Token] = _l1Token;
+
+        emit UpdateTokenMapping(_l2Token, _l1Token);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @inheritdoc L2ERC20Gateway
+    function _withdraw(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal virtual override {
+        address _l1Token = tokenMapping[_token];
+        require(_l1Token != address(0), "no corresponding l1 token");
+
+        require(_amount > 0, "withdraw zero amount");
+
+        // 1. Extract real sender if this call is from L2GatewayRouter.
+        address _from = msg.sender;
+        if (router == msg.sender) {
+            (_from, _data) = abi.decode(_data, (address, bytes));
+        }
+
+        // 2. Burn token.
+        IScrollStandardERC20(_token).burn(_from, _amount);
+
+        // 3. Generate message passed to L1StandardERC20Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL1ERC20Gateway.finalizeWithdrawERC20.selector,
+            _l1Token,
+            _token,
+            _from,
+            _to,
+            _amount,
+            _data
+        );
+
+        // 4. send message to L2ScrollMessenger
+        IL2ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit WithdrawERC20(_l1Token, _token, _from, _to, _amount, _data);
+    }
 }

contracts/src/L2/gateways/L2ERC1155Gateway.sol

@@ -2,15 +2,15 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
-import { IERC1155Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC1155/IERC1155Upgradeable.sol";
-import { ERC1155HolderUpgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC1155/utils/ERC1155HolderUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {IERC1155Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC1155/IERC1155Upgradeable.sol";
+import {ERC1155HolderUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC1155/utils/ERC1155HolderUpgradeable.sol";
 
-import { IL2ERC1155Gateway } from "./IL2ERC1155Gateway.sol";
-import { IL2ScrollMessenger } from "../IL2ScrollMessenger.sol";
-import { IL1ERC1155Gateway } from "../../L1/gateways/IL1ERC1155Gateway.sol";
-import { ScrollGatewayBase, IScrollGateway } from "../../libraries/gateway/ScrollGatewayBase.sol";
-import { IScrollERC1155 } from "../../libraries/token/IScrollERC1155.sol";
+import {IL2ERC1155Gateway} from "./IL2ERC1155Gateway.sol";
+import {IL2ScrollMessenger} from "../IL2ScrollMessenger.sol";
+import {IL1ERC1155Gateway} from "../../L1/gateways/IL1ERC1155Gateway.sol";
+import {ScrollGatewayBase, IScrollGateway} from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {IScrollERC1155} from "../../libraries/token/IScrollERC1155.sol";
 
 /// @title L2ERC1155Gateway
 /// @notice The `L2ERC1155Gateway` is used to withdraw ERC1155 compatible NFTs in layer 2 and
@@ -21,203 +21,203 @@ import { IScrollERC1155 } from "../../libraries/token/IScrollERC1155.sol";
 /// This will be changed if we have more specific scenarios.
 // @todo Current implementation doesn't support calling from `L2GatewayRouter`.
 contract L2ERC1155Gateway is OwnableUpgradeable, ERC1155HolderUpgradeable, ScrollGatewayBase, IL2ERC1155Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when token mapping for ERC1155 token is updated.
-  /// @param _l1Token The address of corresponding ERC1155 token in layer 2.
-  /// @param _l1Token The address of ERC1155 token in layer 1.
-  event UpdateTokenMapping(address _l2Token, address _l1Token);
+    /// @notice Emitted when token mapping for ERC1155 token is updated.
+    /// @param _l1Token The address of corresponding ERC1155 token in layer 2.
+    /// @param _l1Token The address of ERC1155 token in layer 1.
+    event UpdateTokenMapping(address _l2Token, address _l1Token);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from layer 2 token address to layer 1 token address for ERC1155 NFT.
-  // solhint-disable-next-line var-name-mixedcase
-  mapping(address => address) public tokenMapping;
+    /// @notice Mapping from layer 2 token address to layer 1 token address for ERC1155 NFT.
+    // solhint-disable-next-line var-name-mixedcase
+    mapping(address => address) public tokenMapping;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  function initialize(address _counterpart, address _messenger) external initializer {
-    OwnableUpgradeable.__Ownable_init();
-    ScrollGatewayBase._initialize(_counterpart, address(0), _messenger);
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL2ERC1155Gateway
-  function withdrawERC1155(
-    address _token,
-    uint256 _tokenId,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external override {
-    _withdrawERC1155(_token, msg.sender, _tokenId, _amount, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC1155Gateway
-  function withdrawERC1155(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external override {
-    _withdrawERC1155(_token, _to, _tokenId, _amount, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC1155Gateway
-  function batchWithdrawERC1155(
-    address _token,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    uint256 _gasLimit
-  ) external override {
-    _batchWithdrawERC1155(_token, msg.sender, _tokenIds, _amounts, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC1155Gateway
-  function batchWithdrawERC1155(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    uint256 _gasLimit
-  ) external override {
-    _batchWithdrawERC1155(_token, _to, _tokenIds, _amounts, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC1155Gateway
-  function finalizeDepositERC1155(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount
-  ) external override nonReentrant onlyCallByCounterpart {
-    IScrollERC1155(_l2Token).mint(_to, _tokenId, _amount, "");
-
-    emit FinalizeDepositERC1155(_l1Token, _l2Token, _from, _to, _tokenId, _amount);
-  }
-
-  /// @inheritdoc IL2ERC1155Gateway
-  function finalizeBatchDepositERC1155(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts
-  ) external override nonReentrant onlyCallByCounterpart {
-    IScrollERC1155(_l2Token).batchMint(_to, _tokenIds, _amounts, "");
-
-    emit FinalizeBatchDepositERC1155(_l1Token, _l2Token, _from, _to, _tokenIds, _amounts);
-  }
-
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Update layer 2 to layer 1 token mapping.
-  /// @param _l1Token The address of corresponding ERC1155 token in layer 2.
-  /// @param _l1Token The address of ERC1155 token in layer 1.
-  function updateTokenMapping(address _l2Token, address _l1Token) external onlyOwner {
-    require(_l1Token != address(0), "map to zero address");
-
-    tokenMapping[_l2Token] = _l1Token;
-
-    emit UpdateTokenMapping(_l2Token, _l1Token);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @dev Internal function to withdraw ERC1155 NFT to layer 2.
-  /// @param _token The address of ERC1155 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenId The token id to withdraw.
-  /// @param _amount The amount of token to withdraw.
-  /// @param _gasLimit Estimated gas limit required to complete the withdraw on layer 2.
-  function _withdrawERC1155(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    require(_amount > 0, "withdraw zero amount");
-
-    address _l1Token = tokenMapping[_token];
-    require(_l1Token != address(0), "token not supported");
-
-    // 1. burn token
-    IScrollERC1155(_token).burn(msg.sender, _tokenId, _amount);
-
-    // 2. Generate message passed to L1ERC1155Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL1ERC1155Gateway.finalizeWithdrawERC1155.selector,
-      _l1Token,
-      _token,
-      msg.sender,
-      _to,
-      _tokenId,
-      _amount
-    );
-
-    // 3. Send message to L2ScrollMessenger.
-    IL2ScrollMessenger(messenger).sendMessage(counterpart, msg.value, _message, _gasLimit);
-
-    emit WithdrawERC1155(_l1Token, _token, msg.sender, _to, _tokenId, _amount);
-  }
-
-  /// @dev Internal function to batch withdraw ERC1155 NFT to layer 2.
-  /// @param _token The address of ERC1155 NFT in layer 1.
-  /// @param _to The address of recipient in layer 2.
-  /// @param _tokenIds The list of token ids to withdraw.
-  /// @param _amounts The list of corresponding number of token to withdraw.
-  /// @param _gasLimit Estimated gas limit required to complete the withdraw on layer 1.
-  function _batchWithdrawERC1155(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    require(_tokenIds.length > 0, "no token to withdraw");
-    require(_tokenIds.length == _amounts.length, "length mismatch");
-
-    for (uint256 i = 0; i < _amounts.length; i++) {
-      require(_amounts[i] > 0, "withdraw zero amount");
+    function initialize(address _counterpart, address _messenger) external initializer {
+        OwnableUpgradeable.__Ownable_init();
+        ScrollGatewayBase._initialize(_counterpart, address(0), _messenger);
     }
 
-    address _l1Token = tokenMapping[_token];
-    require(_l1Token != address(0), "token not supported");
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-    // 1. transfer token to this contract
-    IScrollERC1155(_token).batchBurn(msg.sender, _tokenIds, _amounts);
+    /// @inheritdoc IL2ERC1155Gateway
+    function withdrawERC1155(
+        address _token,
+        uint256 _tokenId,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        _withdrawERC1155(_token, msg.sender, _tokenId, _amount, _gasLimit);
+    }
 
-    // 2. Generate message passed to L1ERC1155Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL1ERC1155Gateway.finalizeBatchWithdrawERC1155.selector,
-      _l1Token,
-      _token,
-      msg.sender,
-      _to,
-      _tokenIds,
-      _amounts
-    );
+    /// @inheritdoc IL2ERC1155Gateway
+    function withdrawERC1155(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        _withdrawERC1155(_token, _to, _tokenId, _amount, _gasLimit);
+    }
 
-    // 3. Send message to L2ScrollMessenger.
-    IL2ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, msg.value, _message, _gasLimit);
+    /// @inheritdoc IL2ERC1155Gateway
+    function batchWithdrawERC1155(
+        address _token,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        uint256 _gasLimit
+    ) external payable override {
+        _batchWithdrawERC1155(_token, msg.sender, _tokenIds, _amounts, _gasLimit);
+    }
 
-    emit BatchWithdrawERC1155(_l1Token, _token, msg.sender, _to, _tokenIds, _amounts);
-  }
+    /// @inheritdoc IL2ERC1155Gateway
+    function batchWithdrawERC1155(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        uint256 _gasLimit
+    ) external payable override {
+        _batchWithdrawERC1155(_token, _to, _tokenIds, _amounts, _gasLimit);
+    }
+
+    /// @inheritdoc IL2ERC1155Gateway
+    function finalizeDepositERC1155(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount
+    ) external override nonReentrant onlyCallByCounterpart {
+        IScrollERC1155(_l2Token).mint(_to, _tokenId, _amount, "");
+
+        emit FinalizeDepositERC1155(_l1Token, _l2Token, _from, _to, _tokenId, _amount);
+    }
+
+    /// @inheritdoc IL2ERC1155Gateway
+    function finalizeBatchDepositERC1155(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts
+    ) external override nonReentrant onlyCallByCounterpart {
+        IScrollERC1155(_l2Token).batchMint(_to, _tokenIds, _amounts, "");
+
+        emit FinalizeBatchDepositERC1155(_l1Token, _l2Token, _from, _to, _tokenIds, _amounts);
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update layer 2 to layer 1 token mapping.
+    /// @param _l1Token The address of corresponding ERC1155 token in layer 2.
+    /// @param _l1Token The address of ERC1155 token in layer 1.
+    function updateTokenMapping(address _l2Token, address _l1Token) external onlyOwner {
+        require(_l1Token != address(0), "map to zero address");
+
+        tokenMapping[_l2Token] = _l1Token;
+
+        emit UpdateTokenMapping(_l2Token, _l1Token);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @dev Internal function to withdraw ERC1155 NFT to layer 2.
+    /// @param _token The address of ERC1155 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenId The token id to withdraw.
+    /// @param _amount The amount of token to withdraw.
+    /// @param _gasLimit Estimated gas limit required to complete the withdraw on layer 2.
+    function _withdrawERC1155(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        require(_amount > 0, "withdraw zero amount");
+
+        address _l1Token = tokenMapping[_token];
+        require(_l1Token != address(0), "token not supported");
+
+        // 1. burn token
+        IScrollERC1155(_token).burn(msg.sender, _tokenId, _amount);
+
+        // 2. Generate message passed to L1ERC1155Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL1ERC1155Gateway.finalizeWithdrawERC1155.selector,
+            _l1Token,
+            _token,
+            msg.sender,
+            _to,
+            _tokenId,
+            _amount
+        );
+
+        // 3. Send message to L2ScrollMessenger.
+        IL2ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit WithdrawERC1155(_l1Token, _token, msg.sender, _to, _tokenId, _amount);
+    }
+
+    /// @dev Internal function to batch withdraw ERC1155 NFT to layer 2.
+    /// @param _token The address of ERC1155 NFT in layer 1.
+    /// @param _to The address of recipient in layer 2.
+    /// @param _tokenIds The list of token ids to withdraw.
+    /// @param _amounts The list of corresponding number of token to withdraw.
+    /// @param _gasLimit Estimated gas limit required to complete the withdraw on layer 1.
+    function _batchWithdrawERC1155(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        require(_tokenIds.length > 0, "no token to withdraw");
+        require(_tokenIds.length == _amounts.length, "length mismatch");
+
+        for (uint256 i = 0; i < _amounts.length; i++) {
+            require(_amounts[i] > 0, "withdraw zero amount");
+        }
+
+        address _l1Token = tokenMapping[_token];
+        require(_l1Token != address(0), "token not supported");
+
+        // 1. transfer token to this contract
+        IScrollERC1155(_token).batchBurn(msg.sender, _tokenIds, _amounts);
+
+        // 2. Generate message passed to L1ERC1155Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL1ERC1155Gateway.finalizeBatchWithdrawERC1155.selector,
+            _l1Token,
+            _token,
+            msg.sender,
+            _to,
+            _tokenIds,
+            _amounts
+        );
+
+        // 3. Send message to L2ScrollMessenger.
+        IL2ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit BatchWithdrawERC1155(_l1Token, _token, msg.sender, _to, _tokenIds, _amounts);
+    }
 }

contracts/src/L2/gateways/L2ERC20Gateway.sol

@@ -2,54 +2,54 @@
 
 pragma solidity ^0.8.0;
 
-import { IL2ERC20Gateway } from "./IL2ERC20Gateway.sol";
+import {IL2ERC20Gateway} from "./IL2ERC20Gateway.sol";
 
 // solhint-disable no-empty-blocks
 
 abstract contract L2ERC20Gateway is IL2ERC20Gateway {
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @inheritdoc IL2ERC20Gateway
-  function withdrawERC20(
-    address _token,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    _withdraw(_token, msg.sender, _amount, new bytes(0), _gasLimit);
-  }
+    /// @inheritdoc IL2ERC20Gateway
+    function withdrawERC20(
+        address _token,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        _withdraw(_token, msg.sender, _amount, new bytes(0), _gasLimit);
+    }
 
-  /// @inheritdoc IL2ERC20Gateway
-  function withdrawERC20(
-    address _token,
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    _withdraw(_token, _to, _amount, new bytes(0), _gasLimit);
-  }
+    /// @inheritdoc IL2ERC20Gateway
+    function withdrawERC20(
+        address _token,
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        _withdraw(_token, _to, _amount, new bytes(0), _gasLimit);
+    }
 
-  /// @inheritdoc IL2ERC20Gateway
-  function withdrawERC20AndCall(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data,
-    uint256 _gasLimit
-  ) external payable override {
-    _withdraw(_token, _to, _amount, _data, _gasLimit);
-  }
+    /// @inheritdoc IL2ERC20Gateway
+    function withdrawERC20AndCall(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data,
+        uint256 _gasLimit
+    ) external payable override {
+        _withdraw(_token, _to, _amount, _data, _gasLimit);
+    }
 
-  /**********************
-   * Internal Functions *
-   **********************/
+    /**********************
+     * Internal Functions *
+     **********************/
 
-  function _withdraw(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal virtual;
+    function _withdraw(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal virtual;
 }

contracts/src/L2/gateways/L2ERC721Gateway.sol

@@ -2,15 +2,15 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
-import { IERC721Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
-import { ERC721HolderUpgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC721/utils/ERC721HolderUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {IERC721Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";
+import {ERC721HolderUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC721/utils/ERC721HolderUpgradeable.sol";
 
-import { IL2ERC721Gateway } from "./IL2ERC721Gateway.sol";
-import { IL2ScrollMessenger } from "../IL2ScrollMessenger.sol";
-import { IL1ERC721Gateway } from "../../L1/gateways/IL1ERC721Gateway.sol";
-import { ScrollGatewayBase, IScrollGateway } from "../../libraries/gateway/ScrollGatewayBase.sol";
-import { IScrollERC721 } from "../../libraries/token/IScrollERC721.sol";
+import {IL2ERC721Gateway} from "./IL2ERC721Gateway.sol";
+import {IL2ScrollMessenger} from "../IL2ScrollMessenger.sol";
+import {IL1ERC721Gateway} from "../../L1/gateways/IL1ERC721Gateway.sol";
+import {ScrollGatewayBase, IScrollGateway} from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {IScrollERC721} from "../../libraries/token/IScrollERC721.sol";
 
 /// @title L2ERC721Gateway
 /// @notice The `L2ERC721Gateway` is used to withdraw ERC721 compatible NFTs in layer 2 and
@@ -21,192 +21,192 @@ import { IScrollERC721 } from "../../libraries/token/IScrollERC721.sol";
 /// This will be changed if we have more specific scenarios.
 // @todo Current implementation doesn't support calling from `L2GatewayRouter`.
 contract L2ERC721Gateway is OwnableUpgradeable, ERC721HolderUpgradeable, ScrollGatewayBase, IL2ERC721Gateway {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when token mapping for ERC721 token is updated.
-  /// @param _l1Token The address of corresponding ERC721 token in layer 2.
-  /// @param _l1Token The address of ERC721 token in layer 1.
-  event UpdateTokenMapping(address _l2Token, address _l1Token);
+    /// @notice Emitted when token mapping for ERC721 token is updated.
+    /// @param _l1Token The address of corresponding ERC721 token in layer 2.
+    /// @param _l1Token The address of ERC721 token in layer 1.
+    event UpdateTokenMapping(address _l2Token, address _l1Token);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from layer 2 token address to layer 1 token address for ERC721 NFT.
-  // solhint-disable-next-line var-name-mixedcase
-  mapping(address => address) public tokenMapping;
+    /// @notice Mapping from layer 2 token address to layer 1 token address for ERC721 NFT.
+    // solhint-disable-next-line var-name-mixedcase
+    mapping(address => address) public tokenMapping;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  function initialize(address _counterpart, address _messenger) external initializer {
-    OwnableUpgradeable.__Ownable_init();
-    ScrollGatewayBase._initialize(_counterpart, address(0), _messenger);
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL2ERC721Gateway
-  function withdrawERC721(
-    address _token,
-    uint256 _tokenId,
-    uint256 _gasLimit
-  ) external override {
-    _withdrawERC721(_token, msg.sender, _tokenId, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC721Gateway
-  function withdrawERC721(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _gasLimit
-  ) external override {
-    _withdrawERC721(_token, _to, _tokenId, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC721Gateway
-  function batchWithdrawERC721(
-    address _token,
-    uint256[] calldata _tokenIds,
-    uint256 _gasLimit
-  ) external override {
-    _batchWithdrawERC721(_token, msg.sender, _tokenIds, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC721Gateway
-  function batchWithdrawERC721(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256 _gasLimit
-  ) external override {
-    _batchWithdrawERC721(_token, _to, _tokenIds, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC721Gateway
-  function finalizeDepositERC721(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _tokenId
-  ) external override nonReentrant onlyCallByCounterpart {
-    IScrollERC721(_l2Token).mint(_to, _tokenId);
-
-    emit FinalizeDepositERC721(_l1Token, _l2Token, _from, _to, _tokenId);
-  }
-
-  /// @inheritdoc IL2ERC721Gateway
-  function finalizeBatchDepositERC721(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256[] calldata _tokenIds
-  ) external override nonReentrant onlyCallByCounterpart {
-    for (uint256 i = 0; i < _tokenIds.length; i++) {
-      IScrollERC721(_l2Token).mint(_to, _tokenIds[i]);
+    function initialize(address _counterpart, address _messenger) external initializer {
+        OwnableUpgradeable.__Ownable_init();
+        ScrollGatewayBase._initialize(_counterpart, address(0), _messenger);
     }
 
-    emit FinalizeBatchDepositERC721(_l1Token, _l2Token, _from, _to, _tokenIds);
-  }
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Update layer 2 to layer 1 token mapping.
-  /// @param _l1Token The address of corresponding ERC721 token in layer 2.
-  /// @param _l1Token The address of ERC721 token in layer 1.
-  function updateTokenMapping(address _l2Token, address _l1Token) external onlyOwner {
-    require(_l1Token != address(0), "map to zero address");
-
-    tokenMapping[_l2Token] = _l1Token;
-
-    emit UpdateTokenMapping(_l2Token, _l1Token);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @dev Internal function to withdraw ERC721 NFT to layer 1.
-  /// @param _token The address of ERC721 NFT in layer 2.
-  /// @param _to The address of recipient in layer 1.
-  /// @param _tokenId The token id to withdraw.
-  /// @param _gasLimit Estimated gas limit required to complete the withdraw on layer 1.
-  function _withdrawERC721(
-    address _token,
-    address _to,
-    uint256 _tokenId,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    address _l1Token = tokenMapping[_token];
-    require(_l1Token != address(0), "token not supported");
-
-    // 1. burn token
-    // @note in case the token has given too much power to the gateway, we check owner here.
-    require(IScrollERC721(_token).ownerOf(_tokenId) == msg.sender, "token not owned");
-    IScrollERC721(_token).burn(_tokenId);
-
-    // 2. Generate message passed to L1ERC721Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL1ERC721Gateway.finalizeWithdrawERC721.selector,
-      _l1Token,
-      _token,
-      msg.sender,
-      _to,
-      _tokenId
-    );
-
-    // 3. Send message to L2ScrollMessenger.
-    IL2ScrollMessenger(messenger).sendMessage(counterpart, msg.value, _message, _gasLimit);
-
-    emit WithdrawERC721(_l1Token, _token, msg.sender, _to, _tokenId);
-  }
-
-  /// @dev Internal function to batch withdraw ERC721 NFT to layer 1.
-  /// @param _token The address of ERC721 NFT in layer 2.
-  /// @param _to The address of recipient in layer 1.
-  /// @param _tokenIds The list of token ids to withdraw.
-  /// @param _gasLimit Estimated gas limit required to complete the withdraw on layer 1.
-  function _batchWithdrawERC721(
-    address _token,
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    require(_tokenIds.length > 0, "no token to withdraw");
-
-    address _l1Token = tokenMapping[_token];
-    require(_l1Token != address(0), "token not supported");
-
-    // 1. transfer token to this contract
-    for (uint256 i = 0; i < _tokenIds.length; i++) {
-      // @note in case the token has given too much power to the gateway, we check owner here.
-      require(IScrollERC721(_token).ownerOf(_tokenIds[i]) == msg.sender, "token not owned");
-      IScrollERC721(_token).burn(_tokenIds[i]);
+    /// @inheritdoc IL2ERC721Gateway
+    function withdrawERC721(
+        address _token,
+        uint256 _tokenId,
+        uint256 _gasLimit
+    ) external payable override {
+        _withdrawERC721(_token, msg.sender, _tokenId, _gasLimit);
     }
 
-    // 2. Generate message passed to L1ERC721Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL1ERC721Gateway.finalizeBatchWithdrawERC721.selector,
-      _l1Token,
-      _token,
-      msg.sender,
-      _to,
-      _tokenIds
-    );
+    /// @inheritdoc IL2ERC721Gateway
+    function withdrawERC721(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _gasLimit
+    ) external payable override {
+        _withdrawERC721(_token, _to, _tokenId, _gasLimit);
+    }
 
-    // 3. Send message to L2ScrollMessenger.
-    IL2ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, msg.value, _message, _gasLimit);
+    /// @inheritdoc IL2ERC721Gateway
+    function batchWithdrawERC721(
+        address _token,
+        uint256[] calldata _tokenIds,
+        uint256 _gasLimit
+    ) external payable override {
+        _batchWithdrawERC721(_token, msg.sender, _tokenIds, _gasLimit);
+    }
 
-    emit BatchWithdrawERC721(_l1Token, _token, msg.sender, _to, _tokenIds);
-  }
+    /// @inheritdoc IL2ERC721Gateway
+    function batchWithdrawERC721(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256 _gasLimit
+    ) external payable override {
+        _batchWithdrawERC721(_token, _to, _tokenIds, _gasLimit);
+    }
+
+    /// @inheritdoc IL2ERC721Gateway
+    function finalizeDepositERC721(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _tokenId
+    ) external override nonReentrant onlyCallByCounterpart {
+        IScrollERC721(_l2Token).mint(_to, _tokenId);
+
+        emit FinalizeDepositERC721(_l1Token, _l2Token, _from, _to, _tokenId);
+    }
+
+    /// @inheritdoc IL2ERC721Gateway
+    function finalizeBatchDepositERC721(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256[] calldata _tokenIds
+    ) external override nonReentrant onlyCallByCounterpart {
+        for (uint256 i = 0; i < _tokenIds.length; i++) {
+            IScrollERC721(_l2Token).mint(_to, _tokenIds[i]);
+        }
+
+        emit FinalizeBatchDepositERC721(_l1Token, _l2Token, _from, _to, _tokenIds);
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update layer 2 to layer 1 token mapping.
+    /// @param _l1Token The address of corresponding ERC721 token in layer 2.
+    /// @param _l1Token The address of ERC721 token in layer 1.
+    function updateTokenMapping(address _l2Token, address _l1Token) external onlyOwner {
+        require(_l1Token != address(0), "map to zero address");
+
+        tokenMapping[_l2Token] = _l1Token;
+
+        emit UpdateTokenMapping(_l2Token, _l1Token);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @dev Internal function to withdraw ERC721 NFT to layer 1.
+    /// @param _token The address of ERC721 NFT in layer 2.
+    /// @param _to The address of recipient in layer 1.
+    /// @param _tokenId The token id to withdraw.
+    /// @param _gasLimit Estimated gas limit required to complete the withdraw on layer 1.
+    function _withdrawERC721(
+        address _token,
+        address _to,
+        uint256 _tokenId,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        address _l1Token = tokenMapping[_token];
+        require(_l1Token != address(0), "token not supported");
+
+        // 1. burn token
+        // @note in case the token has given too much power to the gateway, we check owner here.
+        require(IScrollERC721(_token).ownerOf(_tokenId) == msg.sender, "token not owned");
+        IScrollERC721(_token).burn(_tokenId);
+
+        // 2. Generate message passed to L1ERC721Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL1ERC721Gateway.finalizeWithdrawERC721.selector,
+            _l1Token,
+            _token,
+            msg.sender,
+            _to,
+            _tokenId
+        );
+
+        // 3. Send message to L2ScrollMessenger.
+        IL2ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit WithdrawERC721(_l1Token, _token, msg.sender, _to, _tokenId);
+    }
+
+    /// @dev Internal function to batch withdraw ERC721 NFT to layer 1.
+    /// @param _token The address of ERC721 NFT in layer 2.
+    /// @param _to The address of recipient in layer 1.
+    /// @param _tokenIds The list of token ids to withdraw.
+    /// @param _gasLimit Estimated gas limit required to complete the withdraw on layer 1.
+    function _batchWithdrawERC721(
+        address _token,
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        require(_tokenIds.length > 0, "no token to withdraw");
+
+        address _l1Token = tokenMapping[_token];
+        require(_l1Token != address(0), "token not supported");
+
+        // 1. transfer token to this contract
+        for (uint256 i = 0; i < _tokenIds.length; i++) {
+            // @note in case the token has given too much power to the gateway, we check owner here.
+            require(IScrollERC721(_token).ownerOf(_tokenIds[i]) == msg.sender, "token not owned");
+            IScrollERC721(_token).burn(_tokenIds[i]);
+        }
+
+        // 2. Generate message passed to L1ERC721Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL1ERC721Gateway.finalizeBatchWithdrawERC721.selector,
+            _l1Token,
+            _token,
+            msg.sender,
+            _to,
+            _tokenIds
+        );
+
+        // 3. Send message to L2ScrollMessenger.
+        IL2ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit BatchWithdrawERC721(_l1Token, _token, msg.sender, _to, _tokenIds);
+    }
 }

contracts/src/L2/gateways/L2ETHGateway.sol

@@ -2,13 +2,13 @@
 
 pragma solidity ^0.8.0;
 
-import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
+import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
 
-import { IL1ETHGateway } from "../../L1/gateways/IL1ETHGateway.sol";
-import { IL2ScrollMessenger } from "../IL2ScrollMessenger.sol";
-import { IL2ETHGateway } from "./IL2ETHGateway.sol";
+import {IL1ETHGateway} from "../../L1/gateways/IL1ETHGateway.sol";
+import {IL2ScrollMessenger} from "../IL2ScrollMessenger.sol";
+import {IL2ETHGateway} from "./IL2ETHGateway.sol";
 
-import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {ScrollGatewayBase} from "../../libraries/gateway/ScrollGatewayBase.sol";
 
 /// @title L2ETHGateway
 /// @notice The `L2ETHGateway` contract is used to withdraw ETH token in layer 2 and
@@ -16,94 +16,94 @@ import { ScrollGatewayBase } from "../../libraries/gateway/ScrollGatewayBase.sol
 /// @dev The ETH are not held in the gateway. The ETH will be sent to the `L2ScrollMessenger` contract.
 /// On finalizing deposit, the Ether will be transfered from `L2ScrollMessenger`, then transfer to recipient.
 contract L2ETHGateway is Initializable, ScrollGatewayBase, IL2ETHGateway {
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  /// @notice Initialize the storage of L2ETHGateway.
-  /// @param _counterpart The address of L1ETHGateway in L2.
-  /// @param _router The address of L2GatewayRouter.
-  /// @param _messenger The address of L2ScrollMessenger.
-  function initialize(
-    address _counterpart,
-    address _router,
-    address _messenger
-  ) external initializer {
-    require(_router != address(0), "zero router address");
-    ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL2ETHGateway
-  function withdrawETH(uint256 _amount, uint256 _gasLimit) external payable override {
-    _withdraw(msg.sender, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL2ETHGateway
-  function withdrawETH(
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) public payable override {
-    _withdraw(_to, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL2ETHGateway
-  function withdrawETHAndCall(
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) public payable override {
-    _withdraw(_to, _amount, _data, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ETHGateway
-  function finalizeDepositETH(
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable override onlyCallByCounterpart {
-    // solhint-disable-next-line avoid-low-level-calls
-    (bool _success, ) = _to.call{ value: _amount }("");
-    require(_success, "ETH transfer failed");
-
-    // @todo farward _data to `_to` in near future.
-
-    emit FinalizeDepositETH(_from, _to, _amount, _data);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  function _withdraw(
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal nonReentrant {
-    require(msg.value > 0, "withdraw zero eth");
-
-    // 1. Extract real sender if this call is from L1GatewayRouter.
-    address _from = msg.sender;
-    if (router == msg.sender) {
-      (_from, _data) = abi.decode(_data, (address, bytes));
+    /// @notice Initialize the storage of L2ETHGateway.
+    /// @param _counterpart The address of L1ETHGateway in L2.
+    /// @param _router The address of L2GatewayRouter.
+    /// @param _messenger The address of L2ScrollMessenger.
+    function initialize(
+        address _counterpart,
+        address _router,
+        address _messenger
+    ) external initializer {
+        require(_router != address(0), "zero router address");
+        ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
     }
 
-    bytes memory _message = abi.encodeWithSelector(
-      IL1ETHGateway.finalizeWithdrawETH.selector,
-      _from,
-      _to,
-      _amount,
-      _data
-    );
-    IL2ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, _amount, _message, _gasLimit);
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-    emit WithdrawETH(_from, _to, _amount, _data);
-  }
+    /// @inheritdoc IL2ETHGateway
+    function withdrawETH(uint256 _amount, uint256 _gasLimit) external payable override {
+        _withdraw(msg.sender, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL2ETHGateway
+    function withdrawETH(
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) public payable override {
+        _withdraw(_to, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL2ETHGateway
+    function withdrawETHAndCall(
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) public payable override {
+        _withdraw(_to, _amount, _data, _gasLimit);
+    }
+
+    /// @inheritdoc IL2ETHGateway
+    function finalizeDepositETH(
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable override onlyCallByCounterpart {
+        // solhint-disable-next-line avoid-low-level-calls
+        (bool _success, ) = _to.call{value: _amount}("");
+        require(_success, "ETH transfer failed");
+
+        // @todo farward _data to `_to` in near future.
+
+        emit FinalizeDepositETH(_from, _to, _amount, _data);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    function _withdraw(
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal nonReentrant {
+        require(msg.value > 0, "withdraw zero eth");
+
+        // 1. Extract real sender if this call is from L1GatewayRouter.
+        address _from = msg.sender;
+        if (router == msg.sender) {
+            (_from, _data) = abi.decode(_data, (address, bytes));
+        }
+
+        bytes memory _message = abi.encodeWithSelector(
+            IL1ETHGateway.finalizeWithdrawETH.selector,
+            _from,
+            _to,
+            _amount,
+            _data
+        );
+        IL2ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, _amount, _message, _gasLimit);
+
+        emit WithdrawETH(_from, _to, _amount, _data);
+    }
 }

contracts/src/L2/gateways/L2GatewayRouter.sol

@@ -2,15 +2,15 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
 
-import { IL2GatewayRouter } from "./IL2GatewayRouter.sol";
-import { IL2ETHGateway } from "./IL2ETHGateway.sol";
-import { IL2ERC20Gateway } from "./IL2ERC20Gateway.sol";
-import { IL2ScrollMessenger } from "../IL2ScrollMessenger.sol";
-import { IL1ETHGateway } from "../../L1/gateways/IL1ETHGateway.sol";
-import { IScrollGateway } from "../../libraries/gateway/IScrollGateway.sol";
-import { IScrollStandardERC20 } from "../../libraries/token/IScrollStandardERC20.sol";
+import {IL2GatewayRouter} from "./IL2GatewayRouter.sol";
+import {IL2ETHGateway} from "./IL2ETHGateway.sol";
+import {IL2ERC20Gateway} from "./IL2ERC20Gateway.sol";
+import {IL2ScrollMessenger} from "../IL2ScrollMessenger.sol";
+import {IL1ETHGateway} from "../../L1/gateways/IL1ETHGateway.sol";
+import {IScrollGateway} from "../../libraries/gateway/IScrollGateway.sol";
+import {IScrollStandardERC20} from "../../libraries/token/IScrollStandardERC20.sol";
 
 /// @title L2GatewayRouter
 /// @notice The `L2GatewayRouter` is the main entry for withdrawing Ether and ERC20 tokens.
@@ -18,195 +18,195 @@ import { IScrollStandardERC20 } from "../../libraries/token/IScrollStandardERC20
 /// @dev One can also use this contract to query L1/L2 token address mapping.
 /// In the future, ERC-721 and ERC-1155 tokens will be added to the router too.
 contract L2GatewayRouter is OwnableUpgradeable, IL2GatewayRouter {
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice The address of L2ETHGateway.
-  address public ethGateway;
+    /// @notice The address of L2ETHGateway.
+    address public ethGateway;
 
-  /// @notice The addess of default L2 ERC20 gateway, normally the L2StandardERC20Gateway contract.
-  address public defaultERC20Gateway;
+    /// @notice The addess of default L2 ERC20 gateway, normally the L2StandardERC20Gateway contract.
+    address public defaultERC20Gateway;
 
-  /// @notice Mapping from L2 ERC20 token address to corresponding L2ERC20Gateway.
-  // solhint-disable-next-line var-name-mixedcase
-  mapping(address => address) public ERC20Gateway;
+    /// @notice Mapping from L2 ERC20 token address to corresponding L2ERC20Gateway.
+    // solhint-disable-next-line var-name-mixedcase
+    mapping(address => address) public ERC20Gateway;
 
-  // @todo: add ERC721/ERC1155 Gateway mapping.
+    // @todo: add ERC721/ERC1155 Gateway mapping.
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  function initialize(address _ethGateway, address _defaultERC20Gateway) external initializer {
-    OwnableUpgradeable.__Ownable_init();
+    function initialize(address _ethGateway, address _defaultERC20Gateway) external initializer {
+        OwnableUpgradeable.__Ownable_init();
 
-    // it can be zero during initialization
-    if (_defaultERC20Gateway != address(0)) {
-      defaultERC20Gateway = _defaultERC20Gateway;
+        // it can be zero during initialization
+        if (_defaultERC20Gateway != address(0)) {
+            defaultERC20Gateway = _defaultERC20Gateway;
+        }
+
+        // it can be zero during initialization
+        if (_ethGateway != address(0)) {
+            ethGateway = _ethGateway;
+            emit SetETHGateway(_ethGateway);
+        }
     }
 
-    // it can be zero during initialization
-    if (_ethGateway != address(0)) {
-      ethGateway = _ethGateway;
-      emit SetETHGateway(_ethGateway);
-    }
-  }
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL2ERC20Gateway
-  function getL2ERC20Address(address) external pure override returns (address) {
-    revert("unsupported");
-  }
-
-  /// @inheritdoc IL2ERC20Gateway
-  function getL1ERC20Address(address _l2Address) external view override returns (address) {
-    address _gateway = getERC20Gateway(_l2Address);
-    if (_gateway == address(0)) {
-      return address(0);
+    /// @inheritdoc IL2ERC20Gateway
+    function getL2ERC20Address(address) external pure override returns (address) {
+        revert("unsupported");
     }
 
-    return IL2ERC20Gateway(_gateway).getL1ERC20Address(_l2Address);
-  }
+    /// @inheritdoc IL2ERC20Gateway
+    function getL1ERC20Address(address _l2Address) external view override returns (address) {
+        address _gateway = getERC20Gateway(_l2Address);
+        if (_gateway == address(0)) {
+            return address(0);
+        }
 
-  /// @notice Return the corresponding gateway address for given token address.
-  /// @param _token The address of token to query.
-  function getERC20Gateway(address _token) public view returns (address) {
-    address _gateway = ERC20Gateway[_token];
-    if (_gateway == address(0)) {
-      _gateway = defaultERC20Gateway;
+        return IL2ERC20Gateway(_gateway).getL1ERC20Address(_l2Address);
     }
-    return _gateway;
-  }
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL2ERC20Gateway
-  function withdrawERC20(
-    address _token,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    withdrawERC20AndCall(_token, msg.sender, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC20Gateway
-  function withdrawERC20(
-    address _token,
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    withdrawERC20AndCall(_token, _to, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL2ERC20Gateway
-  function withdrawERC20AndCall(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) public payable override {
-    address _gateway = getERC20Gateway(_token);
-    require(_gateway != address(0), "no gateway available");
-
-    // encode msg.sender with _data
-    bytes memory _routerData = abi.encode(msg.sender, _data);
-
-    IL2ERC20Gateway(_gateway).withdrawERC20AndCall{ value: msg.value }(_token, _to, _amount, _routerData, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ETHGateway
-  function withdrawETH(uint256 _amount, uint256 _gasLimit) external payable override {
-    withdrawETHAndCall(msg.sender, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL2ETHGateway
-  function withdrawETH(
-    address _to,
-    uint256 _amount,
-    uint256 _gasLimit
-  ) external payable override {
-    withdrawETHAndCall(_to, _amount, new bytes(0), _gasLimit);
-  }
-
-  /// @inheritdoc IL2ETHGateway
-  function withdrawETHAndCall(
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) public payable override {
-    address _gateway = ethGateway;
-    require(_gateway != address(0), "eth gateway available");
-
-    // encode msg.sender with _data
-    bytes memory _routerData = abi.encode(msg.sender, _data);
-
-    IL2ETHGateway(_gateway).withdrawETHAndCall{ value: msg.value }(_to, _amount, _routerData, _gasLimit);
-  }
-
-  /// @inheritdoc IL2ETHGateway
-  function finalizeDepositETH(
-    address,
-    address,
-    uint256,
-    bytes calldata
-  ) external payable virtual override {
-    revert("should never be called");
-  }
-
-  /// @inheritdoc IL2ERC20Gateway
-  function finalizeDepositERC20(
-    address,
-    address,
-    address,
-    address,
-    uint256,
-    bytes calldata
-  ) external payable virtual override {
-    revert("should never be called");
-  }
-
-  /************************
-   * Restricted Functions *
-   ************************/
-
-  /// @notice Update the address of ETH gateway contract.
-  /// @dev This function should only be called by contract owner.
-  /// @param _ethGateway The address to update.
-  function setETHGateway(address _ethGateway) external onlyOwner {
-    ethGateway = _ethGateway;
-
-    emit SetETHGateway(_ethGateway);
-  }
-
-  /// @notice Update the address of default ERC20 gateway contract.
-  /// @dev This function should only be called by contract owner.
-  /// @param _defaultERC20Gateway The address to update.
-  function setDefaultERC20Gateway(address _defaultERC20Gateway) external onlyOwner {
-    defaultERC20Gateway = _defaultERC20Gateway;
-
-    emit SetDefaultERC20Gateway(_defaultERC20Gateway);
-  }
-
-  /// @notice Update the mapping from token address to gateway address.
-  /// @dev This function should only be called by contract owner.
-  /// @param _tokens The list of addresses of tokens to update.
-  /// @param _gateways The list of addresses of gateways to update.
-  function setERC20Gateway(address[] memory _tokens, address[] memory _gateways) external onlyOwner {
-    require(_tokens.length == _gateways.length, "length mismatch");
-
-    for (uint256 i = 0; i < _tokens.length; i++) {
-      ERC20Gateway[_tokens[i]] = _gateways[i];
-
-      emit SetERC20Gateway(_tokens[i], _gateways[i]);
+    /// @notice Return the corresponding gateway address for given token address.
+    /// @param _token The address of token to query.
+    function getERC20Gateway(address _token) public view returns (address) {
+        address _gateway = ERC20Gateway[_token];
+        if (_gateway == address(0)) {
+            _gateway = defaultERC20Gateway;
+        }
+        return _gateway;
+    }
+
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
+
+    /// @inheritdoc IL2ERC20Gateway
+    function withdrawERC20(
+        address _token,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        withdrawERC20AndCall(_token, msg.sender, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL2ERC20Gateway
+    function withdrawERC20(
+        address _token,
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        withdrawERC20AndCall(_token, _to, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL2ERC20Gateway
+    function withdrawERC20AndCall(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) public payable override {
+        address _gateway = getERC20Gateway(_token);
+        require(_gateway != address(0), "no gateway available");
+
+        // encode msg.sender with _data
+        bytes memory _routerData = abi.encode(msg.sender, _data);
+
+        IL2ERC20Gateway(_gateway).withdrawERC20AndCall{value: msg.value}(_token, _to, _amount, _routerData, _gasLimit);
+    }
+
+    /// @inheritdoc IL2ETHGateway
+    function withdrawETH(uint256 _amount, uint256 _gasLimit) external payable override {
+        withdrawETHAndCall(msg.sender, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL2ETHGateway
+    function withdrawETH(
+        address _to,
+        uint256 _amount,
+        uint256 _gasLimit
+    ) external payable override {
+        withdrawETHAndCall(_to, _amount, new bytes(0), _gasLimit);
+    }
+
+    /// @inheritdoc IL2ETHGateway
+    function withdrawETHAndCall(
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) public payable override {
+        address _gateway = ethGateway;
+        require(_gateway != address(0), "eth gateway available");
+
+        // encode msg.sender with _data
+        bytes memory _routerData = abi.encode(msg.sender, _data);
+
+        IL2ETHGateway(_gateway).withdrawETHAndCall{value: msg.value}(_to, _amount, _routerData, _gasLimit);
+    }
+
+    /// @inheritdoc IL2ETHGateway
+    function finalizeDepositETH(
+        address,
+        address,
+        uint256,
+        bytes calldata
+    ) external payable virtual override {
+        revert("should never be called");
+    }
+
+    /// @inheritdoc IL2ERC20Gateway
+    function finalizeDepositERC20(
+        address,
+        address,
+        address,
+        address,
+        uint256,
+        bytes calldata
+    ) external payable virtual override {
+        revert("should never be called");
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update the address of ETH gateway contract.
+    /// @dev This function should only be called by contract owner.
+    /// @param _ethGateway The address to update.
+    function setETHGateway(address _ethGateway) external onlyOwner {
+        ethGateway = _ethGateway;
+
+        emit SetETHGateway(_ethGateway);
+    }
+
+    /// @notice Update the address of default ERC20 gateway contract.
+    /// @dev This function should only be called by contract owner.
+    /// @param _defaultERC20Gateway The address to update.
+    function setDefaultERC20Gateway(address _defaultERC20Gateway) external onlyOwner {
+        defaultERC20Gateway = _defaultERC20Gateway;
+
+        emit SetDefaultERC20Gateway(_defaultERC20Gateway);
+    }
+
+    /// @notice Update the mapping from token address to gateway address.
+    /// @dev This function should only be called by contract owner.
+    /// @param _tokens The list of addresses of tokens to update.
+    /// @param _gateways The list of addresses of gateways to update.
+    function setERC20Gateway(address[] memory _tokens, address[] memory _gateways) external onlyOwner {
+        require(_tokens.length == _gateways.length, "length mismatch");
+
+        for (uint256 i = 0; i < _tokens.length; i++) {
+            ERC20Gateway[_tokens[i]] = _gateways[i];
+
+            emit SetERC20Gateway(_tokens[i], _gateways[i]);
+        }
     }
-  }
 }

contracts/src/L2/gateways/L2StandardERC20Gateway.sol

@@ -2,18 +2,18 @@
 
 pragma solidity ^0.8.0;
 
-import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
-import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
-import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
-import { Address } from "@openzeppelin/contracts/utils/Address.sol";
+import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
+import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import {Address} from "@openzeppelin/contracts/utils/Address.sol";
 
-import { IL2ERC20Gateway, L2ERC20Gateway } from "./L2ERC20Gateway.sol";
-import { IL2ScrollMessenger } from "../IL2ScrollMessenger.sol";
-import { IL1ERC20Gateway } from "../../L1/gateways/IL1ERC20Gateway.sol";
-import { IScrollStandardERC20 } from "../../libraries/token/IScrollStandardERC20.sol";
-import { ScrollStandardERC20 } from "../../libraries/token/ScrollStandardERC20.sol";
-import { IScrollStandardERC20Factory } from "../../libraries/token/IScrollStandardERC20Factory.sol";
-import { ScrollGatewayBase, IScrollGateway } from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {IL2ERC20Gateway, L2ERC20Gateway} from "./L2ERC20Gateway.sol";
+import {IL2ScrollMessenger} from "../IL2ScrollMessenger.sol";
+import {IL1ERC20Gateway} from "../../L1/gateways/IL1ERC20Gateway.sol";
+import {IScrollStandardERC20} from "../../libraries/token/IScrollStandardERC20.sol";
+import {ScrollStandardERC20} from "../../libraries/token/ScrollStandardERC20.sol";
+import {IScrollStandardERC20Factory} from "../../libraries/token/IScrollStandardERC20Factory.sol";
+import {ScrollGatewayBase, IScrollGateway} from "../../libraries/gateway/ScrollGatewayBase.sol";
 
 /// @title L2StandardERC20Gateway
 /// @notice The `L2StandardERC20Gateway` is used to withdraw standard ERC20 tokens in layer 2 and
@@ -22,142 +22,145 @@ import { ScrollGatewayBase, IScrollGateway } from "../../libraries/gateway/Scrol
 /// token will be minted and transfered to the recipient. Any ERC20 that requires non-standard functionality
 /// should use a separate gateway.
 contract L2StandardERC20Gateway is Initializable, ScrollGatewayBase, L2ERC20Gateway {
-  using SafeERC20 for IERC20;
-  using Address for address;
+    using SafeERC20 for IERC20;
+    using Address for address;
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice Mapping from l2 token address to l1 token address.
-  mapping(address => address) private tokenMapping;
+    /// @notice Mapping from l2 token address to l1 token address.
+    mapping(address => address) private tokenMapping;
 
-  /// @notice The address of ScrollStandardERC20Factory.
-  address public tokenFactory;
+    /// @notice The address of ScrollStandardERC20Factory.
+    address public tokenFactory;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  function initialize(
-    address _counterpart,
-    address _router,
-    address _messenger,
-    address _tokenFactory
-  ) external initializer {
-    require(_router != address(0), "zero router address");
-    ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
+    function initialize(
+        address _counterpart,
+        address _router,
+        address _messenger,
+        address _tokenFactory
+    ) external initializer {
+        require(_router != address(0), "zero router address");
+        ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
 
-    require(_tokenFactory != address(0), "zero token factory");
-    tokenFactory = _tokenFactory;
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL2ERC20Gateway
-  function getL1ERC20Address(address _l2Token) external view override returns (address) {
-    return tokenMapping[_l2Token];
-  }
-
-  /// @inheritdoc IL2ERC20Gateway
-  function getL2ERC20Address(address _l1Token) public view override returns (address) {
-    return IScrollStandardERC20Factory(tokenFactory).computeL2TokenAddress(address(this), _l1Token);
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL2ERC20Gateway
-  function finalizeDepositERC20(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable override onlyCallByCounterpart {
-    require(msg.value == 0, "nonzero msg.value");
-
-    {
-      // avoid stack too deep
-      address _expectedL2Token = IScrollStandardERC20Factory(tokenFactory).computeL2TokenAddress(
-        address(this),
-        _l1Token
-      );
-      require(_l2Token == _expectedL2Token, "l2 token mismatch");
+        require(_tokenFactory != address(0), "zero token factory");
+        tokenFactory = _tokenFactory;
     }
 
-    bytes memory _deployData;
-    bytes memory _callData;
+    /*************************
+     * Public View Functions *
+     *************************/
 
-    if (tokenMapping[_l2Token] == address(0)) {
-      // first deposit, update mapping
-      tokenMapping[_l2Token] = _l1Token;
-      (_callData, _deployData) = abi.decode(_data, (bytes, bytes));
-    } else {
-      _callData = _data;
+    /// @inheritdoc IL2ERC20Gateway
+    function getL1ERC20Address(address _l2Token) external view override returns (address) {
+        return tokenMapping[_l2Token];
     }
 
-    if (!_l2Token.isContract()) {
-      _deployL2Token(_deployData, _l1Token);
+    /// @inheritdoc IL2ERC20Gateway
+    function getL2ERC20Address(address _l1Token) public view override returns (address) {
+        return IScrollStandardERC20Factory(tokenFactory).computeL2TokenAddress(address(this), _l1Token);
     }
 
-    // @todo forward `_callData` to `_to` using transferAndCall in the near future
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-    IScrollStandardERC20(_l2Token).mint(_to, _amount);
+    /// @inheritdoc IL2ERC20Gateway
+    function finalizeDepositERC20(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable override onlyCallByCounterpart {
+        require(msg.value == 0, "nonzero msg.value");
 
-    emit FinalizeDepositERC20(_l1Token, _l2Token, _from, _to, _amount, _callData);
-  }
+        {
+            // avoid stack too deep
+            address _expectedL2Token = IScrollStandardERC20Factory(tokenFactory).computeL2TokenAddress(
+                address(this),
+                _l1Token
+            );
+            require(_l2Token == _expectedL2Token, "l2 token mismatch");
+        }
 
-  /**********************
-   * Internal Functions *
-   **********************/
+        bytes memory _deployData;
+        bytes memory _callData;
 
-  /// @inheritdoc L2ERC20Gateway
-  function _withdraw(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal virtual override {
-    require(_amount > 0, "withdraw zero amount");
+        if (tokenMapping[_l2Token] == address(0)) {
+            // first deposit, update mapping
+            tokenMapping[_l2Token] = _l1Token;
+            (_callData, _deployData) = abi.decode(_data, (bytes, bytes));
+        } else {
+            _callData = _data;
+        }
 
-    // 1. Extract real sender if this call is from L2GatewayRouter.
-    address _from = msg.sender;
-    if (router == msg.sender) {
-      (_from, _data) = abi.decode(_data, (address, bytes));
+        if (!_l2Token.isContract()) {
+            _deployL2Token(_deployData, _l1Token);
+        }
+
+        // @todo forward `_callData` to `_to` using transferAndCall in the near future
+
+        IScrollStandardERC20(_l2Token).mint(_to, _amount);
+
+        emit FinalizeDepositERC20(_l1Token, _l2Token, _from, _to, _amount, _callData);
     }
 
-    address _l1Token = tokenMapping[_token];
-    require(_l1Token != address(0), "no corresponding l1 token");
+    /**********************
+     * Internal Functions *
+     **********************/
 
-    // 2. Burn token.
-    IScrollStandardERC20(_token).burn(_from, _amount);
+    /// @inheritdoc L2ERC20Gateway
+    function _withdraw(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal virtual override {
+        require(_amount > 0, "withdraw zero amount");
 
-    // 3. Generate message passed to L1StandardERC20Gateway.
-    bytes memory _message = abi.encodeWithSelector(
-      IL1ERC20Gateway.finalizeWithdrawERC20.selector,
-      _l1Token,
-      _token,
-      _from,
-      _to,
-      _amount,
-      _data
-    );
+        // 1. Extract real sender if this call is from L2GatewayRouter.
+        address _from = msg.sender;
+        if (router == msg.sender) {
+            (_from, _data) = abi.decode(_data, (address, bytes));
+        }
 
-    // 4. send message to L2ScrollMessenger
-    IL2ScrollMessenger(messenger).sendMessage{ value: msg.value }(counterpart, 0, _message, _gasLimit);
+        address _l1Token = tokenMapping[_token];
+        require(_l1Token != address(0), "no corresponding l1 token");
 
-    emit WithdrawERC20(_l1Token, _token, _from, _to, _amount, _data);
-  }
+        // 2. Burn token.
+        IScrollStandardERC20(_token).burn(_from, _amount);
 
-  function _deployL2Token(bytes memory _deployData, address _l1Token) internal {
-    address _l2Token = IScrollStandardERC20Factory(tokenFactory).deployL2Token(address(this), _l1Token);
-    (string memory _symbol, string memory _name, uint8 _decimals) = abi.decode(_deployData, (string, string, uint8));
-    ScrollStandardERC20(_l2Token).initialize(_name, _symbol, _decimals, address(this), _l1Token);
-  }
+        // 3. Generate message passed to L1StandardERC20Gateway.
+        bytes memory _message = abi.encodeWithSelector(
+            IL1ERC20Gateway.finalizeWithdrawERC20.selector,
+            _l1Token,
+            _token,
+            _from,
+            _to,
+            _amount,
+            _data
+        );
+
+        // 4. send message to L2ScrollMessenger
+        IL2ScrollMessenger(messenger).sendMessage{value: msg.value}(counterpart, 0, _message, _gasLimit);
+
+        emit WithdrawERC20(_l1Token, _token, _from, _to, _amount, _data);
+    }
+
+    function _deployL2Token(bytes memory _deployData, address _l1Token) internal {
+        address _l2Token = IScrollStandardERC20Factory(tokenFactory).deployL2Token(address(this), _l1Token);
+        (string memory _symbol, string memory _name, uint8 _decimals) = abi.decode(
+            _deployData,
+            (string, string, uint8)
+        );
+        ScrollStandardERC20(_l2Token).initialize(_name, _symbol, _decimals, address(this), _l1Token);
+    }
 }

contracts/src/L2/gateways/L2WETHGateway.sol

@@ -2,15 +2,15 @@
 
 pragma solidity ^0.8.0;
 
-import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
-import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
-import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import {Initializable} from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
+import {IERC20} from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+import {SafeERC20} from "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
 
-import { IL2ERC20Gateway, L2ERC20Gateway } from "./L2ERC20Gateway.sol";
-import { IL2ScrollMessenger } from "../IL2ScrollMessenger.sol";
-import { IWETH } from "../../interfaces/IWETH.sol";
-import { IL1ERC20Gateway } from "../../L1/gateways/IL1ERC20Gateway.sol";
-import { ScrollGatewayBase, IScrollGateway } from "../../libraries/gateway/ScrollGatewayBase.sol";
+import {IL2ERC20Gateway, L2ERC20Gateway} from "./L2ERC20Gateway.sol";
+import {IL2ScrollMessenger} from "../IL2ScrollMessenger.sol";
+import {IWETH} from "../../interfaces/IWETH.sol";
+import {IL1ERC20Gateway} from "../../L1/gateways/IL1ERC20Gateway.sol";
+import {ScrollGatewayBase, IScrollGateway} from "../../libraries/gateway/ScrollGatewayBase.sol";
 
 /// @title L2WETHGateway
 /// @notice The `L2WETHGateway` contract is used to withdraw `WETH` token in layer 2 and
@@ -20,121 +20,126 @@ import { ScrollGatewayBase, IScrollGateway } from "../../libraries/gateway/Scrol
 /// On finalizing deposit, the Ether will be transfered from `L2ScrollMessenger`, then
 /// wrapped as WETH and finally transfer to recipient.
 contract L2WETHGateway is Initializable, ScrollGatewayBase, L2ERC20Gateway {
-  using SafeERC20 for IERC20;
+    using SafeERC20 for IERC20;
 
-  /*************
-   * Constants *
-   *************/
+    /*************
+     * Constants *
+     *************/
 
-  /// @notice The address of L1 WETH address.
-  address public immutable l1WETH;
+    /// @notice The address of L1 WETH address.
+    address public immutable l1WETH;
 
-  /// @notice The address of L2 WETH address.
-  // @todo It should be predeployed in L2 and make it a constant.
-  // solhint-disable-next-line var-name-mixedcase
-  address public immutable WETH;
+    /// @notice The address of L2 WETH address.
+    // @todo It should be predeployed in L2 and make it a constant.
+    // solhint-disable-next-line var-name-mixedcase
+    address public immutable WETH;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  constructor(address _WETH, address _l1WETH) {
-    WETH = _WETH;
-    l1WETH = _l1WETH;
-  }
-
-  function initialize(
-    address _counterpart,
-    address _router,
-    address _messenger
-  ) external initializer {
-    require(_router != address(0), "zero router address");
-    ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
-  }
-
-  receive() external payable {
-    require(msg.sender == WETH, "only WETH");
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL2ERC20Gateway
-  function getL1ERC20Address(address) external view override returns (address) {
-    return l1WETH;
-  }
-
-  /// @inheritdoc IL2ERC20Gateway
-  function getL2ERC20Address(address) public view override returns (address) {
-    return WETH;
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL2ERC20Gateway
-  function finalizeDepositERC20(
-    address _l1Token,
-    address _l2Token,
-    address _from,
-    address _to,
-    uint256 _amount,
-    bytes calldata _data
-  ) external payable override onlyCallByCounterpart {
-    require(_l1Token == l1WETH, "l1 token not WETH");
-    require(_l2Token == WETH, "l2 token not WETH");
-    require(_amount == msg.value, "msg.value mismatch");
-
-    IWETH(_l2Token).deposit{ value: _amount }();
-    IERC20(_l2Token).safeTransfer(_to, _amount);
-
-    // @todo forward `_data` to `_to` in near future
-
-    emit FinalizeDepositERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
-  }
-
-  /**********************
-   * Internal Functions *
-   **********************/
-
-  /// @inheritdoc L2ERC20Gateway
-  function _withdraw(
-    address _token,
-    address _to,
-    uint256 _amount,
-    bytes memory _data,
-    uint256 _gasLimit
-  ) internal virtual override {
-    require(_amount > 0, "withdraw zero amount");
-    require(_token == WETH, "only WETH is allowed");
-
-    // 1. Extract real sender if this call is from L1GatewayRouter.
-    address _from = msg.sender;
-    if (router == msg.sender) {
-      (_from, _data) = abi.decode(_data, (address, bytes));
+    constructor(address _WETH, address _l1WETH) {
+        WETH = _WETH;
+        l1WETH = _l1WETH;
     }
 
-    // 2. Transfer token into this contract.
-    IERC20(_token).safeTransferFrom(_from, address(this), _amount);
-    IWETH(_token).withdraw(_amount);
+    function initialize(
+        address _counterpart,
+        address _router,
+        address _messenger
+    ) external initializer {
+        require(_router != address(0), "zero router address");
+        ScrollGatewayBase._initialize(_counterpart, _router, _messenger);
+    }
 
-    // 3. Generate message passed to L2StandardERC20Gateway.
-    address _l1WETH = l1WETH;
-    bytes memory _message = abi.encodeWithSelector(
-      IL1ERC20Gateway.finalizeWithdrawERC20.selector,
-      _l1WETH,
-      _token,
-      _from,
-      _to,
-      _amount,
-      _data
-    );
+    receive() external payable {
+        require(msg.sender == WETH, "only WETH");
+    }
 
-    // 4. Send message to L1ScrollMessenger.
-    IL2ScrollMessenger(messenger).sendMessage{ value: _amount + msg.value }(counterpart, _amount, _message, _gasLimit);
+    /*************************
+     * Public View Functions *
+     *************************/
 
-    emit WithdrawERC20(_l1WETH, _token, _from, _to, _amount, _data);
-  }
+    /// @inheritdoc IL2ERC20Gateway
+    function getL1ERC20Address(address) external view override returns (address) {
+        return l1WETH;
+    }
+
+    /// @inheritdoc IL2ERC20Gateway
+    function getL2ERC20Address(address) public view override returns (address) {
+        return WETH;
+    }
+
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
+
+    /// @inheritdoc IL2ERC20Gateway
+    function finalizeDepositERC20(
+        address _l1Token,
+        address _l2Token,
+        address _from,
+        address _to,
+        uint256 _amount,
+        bytes calldata _data
+    ) external payable override onlyCallByCounterpart {
+        require(_l1Token == l1WETH, "l1 token not WETH");
+        require(_l2Token == WETH, "l2 token not WETH");
+        require(_amount == msg.value, "msg.value mismatch");
+
+        IWETH(_l2Token).deposit{value: _amount}();
+        IERC20(_l2Token).safeTransfer(_to, _amount);
+
+        // @todo forward `_data` to `_to` in near future
+
+        emit FinalizeDepositERC20(_l1Token, _l2Token, _from, _to, _amount, _data);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @inheritdoc L2ERC20Gateway
+    function _withdraw(
+        address _token,
+        address _to,
+        uint256 _amount,
+        bytes memory _data,
+        uint256 _gasLimit
+    ) internal virtual override {
+        require(_amount > 0, "withdraw zero amount");
+        require(_token == WETH, "only WETH is allowed");
+
+        // 1. Extract real sender if this call is from L1GatewayRouter.
+        address _from = msg.sender;
+        if (router == msg.sender) {
+            (_from, _data) = abi.decode(_data, (address, bytes));
+        }
+
+        // 2. Transfer token into this contract.
+        IERC20(_token).safeTransferFrom(_from, address(this), _amount);
+        IWETH(_token).withdraw(_amount);
+
+        // 3. Generate message passed to L2StandardERC20Gateway.
+        address _l1WETH = l1WETH;
+        bytes memory _message = abi.encodeWithSelector(
+            IL1ERC20Gateway.finalizeWithdrawERC20.selector,
+            _l1WETH,
+            _token,
+            _from,
+            _to,
+            _amount,
+            _data
+        );
+
+        // 4. Send message to L1ScrollMessenger.
+        IL2ScrollMessenger(messenger).sendMessage{value: _amount + msg.value}(
+            counterpart,
+            _amount,
+            _message,
+            _gasLimit
+        );
+
+        emit WithdrawERC20(_l1WETH, _token, _from, _to, _amount, _data);
+    }
 }

contracts/src/L2/predeploys/IL1BlockContainer.sol

@@ -3,61 +3,61 @@
 pragma solidity ^0.8.0;
 
 interface IL1BlockContainer {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when a block is imported.
-  /// @param blockHash The hash of the imported block.
-  /// @param blockHeight The height of the imported block.
-  /// @param blockTimestamp The timestamp of the imported block.
-  /// @param baseFee The base fee of the imported block.
-  /// @param stateRoot The state root of the imported block.
-  event ImportBlock(
-    bytes32 indexed blockHash,
-    uint256 blockHeight,
-    uint256 blockTimestamp,
-    uint256 baseFee,
-    bytes32 stateRoot
-  );
+    /// @notice Emitted when a block is imported.
+    /// @param blockHash The hash of the imported block.
+    /// @param blockHeight The height of the imported block.
+    /// @param blockTimestamp The timestamp of the imported block.
+    /// @param baseFee The base fee of the imported block.
+    /// @param stateRoot The state root of the imported block.
+    event ImportBlock(
+        bytes32 indexed blockHash,
+        uint256 blockHeight,
+        uint256 blockTimestamp,
+        uint256 baseFee,
+        bytes32 stateRoot
+    );
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Return the latest imported block hash
-  function latestBlockHash() external view returns (bytes32);
+    /// @notice Return the latest imported block hash
+    function latestBlockHash() external view returns (bytes32);
 
-  /// @notice Return the latest imported L1 base fee
-  function latestBaseFee() external view returns (uint256);
+    /// @notice Return the latest imported L1 base fee
+    function latestBaseFee() external view returns (uint256);
 
-  /// @notice Return the latest imported block number
-  function latestBlockNumber() external view returns (uint256);
+    /// @notice Return the latest imported block number
+    function latestBlockNumber() external view returns (uint256);
 
-  /// @notice Return the latest imported block timestamp
-  function latestBlockTimestamp() external view returns (uint256);
+    /// @notice Return the latest imported block timestamp
+    function latestBlockTimestamp() external view returns (uint256);
 
-  /// @notice Return the state root of given block.
-  /// @param blockHash The block hash to query.
-  /// @return stateRoot The state root of the block.
-  function getStateRoot(bytes32 blockHash) external view returns (bytes32 stateRoot);
+    /// @notice Return the state root of given block.
+    /// @param blockHash The block hash to query.
+    /// @return stateRoot The state root of the block.
+    function getStateRoot(bytes32 blockHash) external view returns (bytes32 stateRoot);
 
-  /// @notice Return the block timestamp of given block.
-  /// @param blockHash The block hash to query.
-  /// @return timestamp The corresponding block timestamp.
-  function getBlockTimestamp(bytes32 blockHash) external view returns (uint256 timestamp);
+    /// @notice Return the block timestamp of given block.
+    /// @param blockHash The block hash to query.
+    /// @return timestamp The corresponding block timestamp.
+    function getBlockTimestamp(bytes32 blockHash) external view returns (uint256 timestamp);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Import L1 block header to this contract.
-  /// @param blockHash The hash of block.
-  /// @param blockHeaderRLP The RLP encoding of L1 block.
-  /// @param updateGasPriceOracle Whether to update gas price oracle.
-  function importBlockHeader(
-    bytes32 blockHash,
-    bytes calldata blockHeaderRLP,
-    bool updateGasPriceOracle
-  ) external;
+    /// @notice Import L1 block header to this contract.
+    /// @param blockHash The hash of block.
+    /// @param blockHeaderRLP The RLP encoding of L1 block.
+    /// @param updateGasPriceOracle Whether to update gas price oracle.
+    function importBlockHeader(
+        bytes32 blockHash,
+        bytes calldata blockHeaderRLP,
+        bool updateGasPriceOracle
+    ) external;
 }

contracts/src/L2/predeploys/IL1GasPriceOracle.sol

@@ -3,54 +3,54 @@
 pragma solidity ^0.8.0;
 
 interface IL1GasPriceOracle {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when current fee overhead is updated.
-  /// @param overhead The current fee overhead updated.
-  event OverheadUpdated(uint256 overhead);
+    /// @notice Emitted when current fee overhead is updated.
+    /// @param overhead The current fee overhead updated.
+    event OverheadUpdated(uint256 overhead);
 
-  /// @notice Emitted when current fee scalar is updated.
-  /// @param scalar The current fee scalar updated.
-  event ScalarUpdated(uint256 scalar);
+    /// @notice Emitted when current fee scalar is updated.
+    /// @param scalar The current fee scalar updated.
+    event ScalarUpdated(uint256 scalar);
 
-  /// @notice Emitted when current l1 base fee is updated.
-  /// @param l1BaseFee The current l1 base fee updated.
-  event L1BaseFeeUpdated(uint256 l1BaseFee);
+    /// @notice Emitted when current l1 base fee is updated.
+    /// @param l1BaseFee The current l1 base fee updated.
+    event L1BaseFeeUpdated(uint256 l1BaseFee);
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Return the current l1 fee overhead.
-  function overhead() external view returns (uint256);
+    /// @notice Return the current l1 fee overhead.
+    function overhead() external view returns (uint256);
 
-  /// @notice Return the current l1 fee scalar.
-  function scalar() external view returns (uint256);
+    /// @notice Return the current l1 fee scalar.
+    function scalar() external view returns (uint256);
 
-  /// @notice Return the latest known l1 base fee.
-  function l1BaseFee() external view returns (uint256);
+    /// @notice Return the latest known l1 base fee.
+    function l1BaseFee() external view returns (uint256);
 
-  /// @notice Computes the L1 portion of the fee based on the size of the rlp encoded input
-  ///         transaction, the current L1 base fee, and the various dynamic parameters.
-  /// @param data Unsigned fully RLP-encoded transaction to get the L1 fee for.
-  /// @return L1 fee that should be paid for the tx
-  function getL1Fee(bytes memory data) external view returns (uint256);
+    /// @notice Computes the L1 portion of the fee based on the size of the rlp encoded input
+    ///         transaction, the current L1 base fee, and the various dynamic parameters.
+    /// @param data Unsigned fully RLP-encoded transaction to get the L1 fee for.
+    /// @return L1 fee that should be paid for the tx
+    function getL1Fee(bytes memory data) external view returns (uint256);
 
-  /// @notice Computes the amount of L1 gas used for a transaction. Adds the overhead which
-  ///         represents the per-transaction gas overhead of posting the transaction and state
-  ///         roots to L1. Adds 68 bytes of padding to account for the fact that the input does
-  ///         not have a signature.
-  /// @param data Unsigned fully RLP-encoded transaction to get the L1 gas for.
-  /// @return Amount of L1 gas used to publish the transaction.
-  function getL1GasUsed(bytes memory data) external view returns (uint256);
+    /// @notice Computes the amount of L1 gas used for a transaction. Adds the overhead which
+    ///         represents the per-transaction gas overhead of posting the transaction and state
+    ///         roots to L1. Adds 68 bytes of padding to account for the fact that the input does
+    ///         not have a signature.
+    /// @param data Unsigned fully RLP-encoded transaction to get the L1 gas for.
+    /// @return Amount of L1 gas used to publish the transaction.
+    function getL1GasUsed(bytes memory data) external view returns (uint256);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Allows whitelisted caller to modify the l1 base fee.
-  /// @param _l1BaseFee New l1 base fee.
-  function setL1BaseFee(uint256 _l1BaseFee) external;
+    /// @notice Allows whitelisted caller to modify the l1 base fee.
+    /// @param _l1BaseFee New l1 base fee.
+    function setL1BaseFee(uint256 _l1BaseFee) external;
 }

contracts/src/L2/predeploys/L1BlockContainer.sol

@@ -2,302 +2,313 @@
 
 pragma solidity ^0.8.0;
 
-import { IL1BlockContainer } from "./IL1BlockContainer.sol";
-import { IL1GasPriceOracle } from "./IL1GasPriceOracle.sol";
+import {IL1BlockContainer} from "./IL1BlockContainer.sol";
+import {IL1GasPriceOracle} from "./IL1GasPriceOracle.sol";
 
-import { OwnableBase } from "../../libraries/common/OwnableBase.sol";
-import { IWhitelist } from "../../libraries/common/IWhitelist.sol";
-import { ScrollPredeploy } from "../../libraries/constants/ScrollPredeploy.sol";
+import {OwnableBase} from "../../libraries/common/OwnableBase.sol";
+import {IWhitelist} from "../../libraries/common/IWhitelist.sol";
+import {ScrollPredeploy} from "../../libraries/constants/ScrollPredeploy.sol";
 
 /// @title L1BlockContainer
 /// @notice This contract will maintain the list of blocks proposed in L1.
 contract L1BlockContainer is OwnableBase, IL1BlockContainer {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when owner updates whitelist contract.
-  /// @param _oldWhitelist The address of old whitelist contract.
-  /// @param _newWhitelist The address of new whitelist contract.
-  event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);
+    /// @notice Emitted when owner updates whitelist contract.
+    /// @param _oldWhitelist The address of old whitelist contract.
+    /// @param _newWhitelist The address of new whitelist contract.
+    event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);
 
-  /***********
-   * Structs *
-   ***********/
+    /***********
+     * Structs *
+     ***********/
 
-  /// @dev Compiler will pack this into single `uint256`.
-  struct BlockMetadata {
-    // The block height.
-    uint64 height;
-    // The block timestamp.
-    uint64 timestamp;
-    // The base fee in the block.
-    uint128 baseFee;
-  }
-
-  /*************
-   * Variables *
-   *************/
-
-  /// @notice The address of whitelist contract.
-  IWhitelist public whitelist;
-
-  // @todo change to ring buffer to save gas usage.
-
-  /// @inheritdoc IL1BlockContainer
-  bytes32 public override latestBlockHash;
-
-  /// @notice Mapping from block hash to corresponding state root.
-  mapping(bytes32 => bytes32) public stateRoot;
-
-  /// @notice Mapping from block hash to corresponding block metadata,
-  /// including timestamp and height.
-  mapping(bytes32 => BlockMetadata) public metadata;
-
-  /***************
-   * Constructor *
-   ***************/
-
-  constructor(address _owner) {
-    _transferOwnership(_owner);
-  }
-
-  function initialize(
-    bytes32 _startBlockHash,
-    uint64 _startBlockHeight,
-    uint64 _startBlockTimestamp,
-    uint128 _startBlockBaseFee,
-    bytes32 _startStateRoot
-  ) external onlyOwner {
-    require(latestBlockHash == bytes32(0), "already initialized");
-
-    latestBlockHash = _startBlockHash;
-    stateRoot[_startBlockHash] = _startStateRoot;
-    metadata[_startBlockHash] = BlockMetadata(_startBlockHeight, _startBlockTimestamp, _startBlockBaseFee);
-
-    emit ImportBlock(_startBlockHash, _startBlockHeight, _startBlockTimestamp, _startBlockBaseFee, _startStateRoot);
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL1BlockContainer
-  function latestBaseFee() external view override returns (uint256) {
-    return metadata[latestBlockHash].baseFee;
-  }
-
-  /// @inheritdoc IL1BlockContainer
-  function latestBlockNumber() external view override returns (uint256) {
-    return metadata[latestBlockHash].height;
-  }
-
-  /// @inheritdoc IL1BlockContainer
-  function latestBlockTimestamp() external view override returns (uint256) {
-    return metadata[latestBlockHash].timestamp;
-  }
-
-  /// @inheritdoc IL1BlockContainer
-  function getStateRoot(bytes32 _blockHash) external view returns (bytes32) {
-    return stateRoot[_blockHash];
-  }
-
-  /// @inheritdoc IL1BlockContainer
-  function getBlockTimestamp(bytes32 _blockHash) external view returns (uint256) {
-    return metadata[_blockHash].timestamp;
-  }
-
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
-
-  /// @inheritdoc IL1BlockContainer
-  function importBlockHeader(
-    bytes32 _blockHash,
-    bytes calldata _blockHeaderRLP,
-    bool _updateGasPriceOracle
-  ) external {
-    // @todo remove this when ETH 2.0 signature verification is ready.
-    {
-      IWhitelist _whitelist = whitelist;
-      require(address(_whitelist) == address(0) || _whitelist.isSenderAllowed(msg.sender), "Not whitelisted sender");
+    /// @dev Compiler will pack this into single `uint256`.
+    struct BlockMetadata {
+        // The block height.
+        uint64 height;
+        // The block timestamp.
+        uint64 timestamp;
+        // The base fee in the block.
+        uint128 baseFee;
     }
 
-    // The encoding order in block header is
-    // 1. ParentHash: 32 bytes
-    // 2. UncleHash: 32 bytes
-    // 3. Coinbase: 20 bytes
-    // 4. StateRoot: 32 bytes
-    // 5. TransactionsRoot: 32 bytes
-    // 6. ReceiptsRoot: 32 bytes
-    // 7. LogsBloom: 256 bytes
-    // 8. Difficulty: uint
-    // 9. BlockHeight: uint
-    // 10. GasLimit: uint64
-    // 11. GasUsed: uint64
-    // 12. BlockTimestamp: uint64
-    // 13. ExtraData: several bytes
-    // 14. MixHash: 32 bytes
-    // 15. BlockNonce: 8 bytes
-    // 16. BaseFee: uint // optional
-    bytes32 _parentHash;
-    bytes32 _stateRoot;
-    uint64 _height;
-    uint64 _timestamp;
-    uint128 _baseFee;
+    /*************
+     * Variables *
+     *************/
 
-    assembly {
-      // reverts with error `msg`.
-      // make sure the length of error string <= 32
-      function revertWith(msg) {
-        // keccak("Error(string)")
-        mstore(0x00, shl(224, 0x08c379a0))
-        mstore(0x04, 0x20) // str.offset
-        mstore(0x44, msg)
-        let msgLen
-        for {} msg {} {
-          msg := shl(8, msg)
-          msgLen := add(msgLen, 1)
-        }
-        mstore(0x24, msgLen) // str.length
-        revert(0x00, 0x64)
-      }
-      // reverts with `msg` when condition is not matched.
-      // make sure the length of error string <= 32
-      function require(cond, msg) {
-        if iszero(cond) {
-          revertWith(msg)
-        }
-      }
-      // returns the calldata offset of the value and the length in bytes
-      // for the RLP encoded data item at `ptr`. used in `decodeFlat`
-      function decodeValue(ptr) -> dataLen, valueOffset {
-        let b0 := byte(0, calldataload(ptr))
+    /// @notice The address of whitelist contract.
+    IWhitelist public whitelist;
 
-        // 0x00 - 0x7f, single byte
-        if lt(b0, 0x80) {
-          // for a single byte whose value is in the [0x00, 0x7f] range,
-          // that byte is its own RLP encoding.
-          dataLen := 1
-          valueOffset := ptr
-          leave
-        }
+    // @todo change to ring buffer to save gas usage.
 
-        // 0x80 - 0xb7, short string/bytes, length <= 55
-        if lt(b0, 0xb8) {
-          // the RLP encoding consists of a single byte with value 0x80
-          // plus the length of the string followed by the string.
-          dataLen := sub(b0, 0x80)
-          valueOffset := add(ptr, 1)
-          leave
-        }
+    /// @inheritdoc IL1BlockContainer
+    bytes32 public override latestBlockHash;
 
-        // 0xb8 - 0xbf, long string/bytes, length > 55
-        if lt(b0, 0xc0) {
-          // the RLP encoding consists of a single byte with value 0xb7
-          // plus the length in bytes of the length of the string in binary form,
-          // followed by the length of the string, followed by the string.
-          let lengthBytes := sub(b0, 0xb7)
-          if gt(lengthBytes, 4) {
-            invalid()
-          }
+    /// @notice Mapping from block hash to corresponding state root.
+    mapping(bytes32 => bytes32) public stateRoot;
 
-          // load the extended length
-          valueOffset := add(ptr, 1)
-          let extendedLen := calldataload(valueOffset)
-          let bits := sub(256, mul(lengthBytes, 8))
-          extendedLen := shr(bits, extendedLen)
+    /// @notice Mapping from block hash to corresponding block metadata,
+    /// including timestamp and height.
+    mapping(bytes32 => BlockMetadata) public metadata;
 
-          dataLen := extendedLen
-          valueOffset := add(valueOffset, lengthBytes)
-          leave
-        }
+    /***************
+     * Constructor *
+     ***************/
 
-        revertWith("Not value")
-      }
-
-      let ptr := _blockHeaderRLP.offset
-      let headerPayloadLength
-      {
-        let b0 := byte(0, calldataload(ptr))
-        // the input should be a long list
-        if lt(b0, 0xf8) {
-          invalid()
-        }
-        let lengthBytes := sub(b0, 0xf7)
-        if gt(lengthBytes, 32) {
-          invalid()
-        }
-        // load the extended length
-        ptr := add(ptr, 1)
-        headerPayloadLength := calldataload(ptr)
-        let bits := sub(256, mul(lengthBytes, 8))
-        // compute payload length: extended length + length bytes + 1
-        headerPayloadLength := shr(bits, headerPayloadLength)
-        headerPayloadLength := add(headerPayloadLength, lengthBytes)
-        headerPayloadLength := add(headerPayloadLength, 1)
-        ptr := add(ptr, lengthBytes)
-      }
-
-      let memPtr := mload(0x40)
-      calldatacopy(memPtr, _blockHeaderRLP.offset, headerPayloadLength)
-      let _computedBlockHash := keccak256(memPtr, headerPayloadLength)
-      require(eq(_blockHash, _computedBlockHash), "Block hash mismatch")
-      
-      // load 16 vaules
-      for { let i := 0 } lt(i, 16) { i := add(i, 1) } {
-        let len, offset := decodeValue(ptr)
-        // the value we care must have at most 32 bytes
-        if lt(len, 33) {
-          let bits := mul( sub(32, len), 8)
-          let value := calldataload(offset)
-          value := shr(bits, value)
-          mstore(memPtr, value)
-        }
-        memPtr := add(memPtr, 0x20)
-        ptr := add(len, offset)
-      }
-      require(eq(ptr, add(_blockHeaderRLP.offset, _blockHeaderRLP.length)), "Header RLP length mismatch")
-
-      memPtr := mload(0x40)
-      // load parent hash, 1-st entry
-      _parentHash := mload(memPtr) 
-      // load state root, 4-th entry
-      _stateRoot := mload(add(memPtr, 0x60))
-      // load block height, 9-th entry
-      _height := mload(add(memPtr, 0x100))
-      // load block timestamp, 12-th entry
-      _timestamp := mload(add(memPtr, 0x160))
-      // load base fee, 16-th entry
-      _baseFee := mload(add(memPtr, 0x1e0))
+    constructor(address _owner) {
+        _transferOwnership(_owner);
     }
-    require(stateRoot[_parentHash] != bytes32(0), "Parent not imported");
-    BlockMetadata memory _parentMetadata = metadata[_parentHash];
-    require(_parentMetadata.height + 1 == _height, "Block height mismatch");
-    require(_parentMetadata.timestamp <= _timestamp, "Parent block has larger timestamp");
 
-    latestBlockHash = _blockHash;
-    stateRoot[_blockHash] = _stateRoot;
-    metadata[_blockHash] = BlockMetadata(_height, _timestamp, _baseFee);
+    function initialize(
+        bytes32 _startBlockHash,
+        uint64 _startBlockHeight,
+        uint64 _startBlockTimestamp,
+        uint128 _startBlockBaseFee,
+        bytes32 _startStateRoot
+    ) external onlyOwner {
+        require(latestBlockHash == bytes32(0), "already initialized");
 
-    emit ImportBlock(_blockHash, _height, _timestamp, _baseFee, _stateRoot);
+        latestBlockHash = _startBlockHash;
+        stateRoot[_startBlockHash] = _startStateRoot;
+        metadata[_startBlockHash] = BlockMetadata(_startBlockHeight, _startBlockTimestamp, _startBlockBaseFee);
 
-    if (_updateGasPriceOracle) {
-      IL1GasPriceOracle(ScrollPredeploy.L1_GAS_PRICE_ORACLE).setL1BaseFee(_baseFee);
+        emit ImportBlock(_startBlockHash, _startBlockHeight, _startBlockTimestamp, _startBlockBaseFee, _startStateRoot);
     }
-  }
 
-  /************************
-   * Restricted Functions *
-   ************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Update whitelist contract.
-  /// @dev This function can only called by contract owner.
-  /// @param _newWhitelist The address of new whitelist contract.
-  function updateWhitelist(address _newWhitelist) external onlyOwner {
-    address _oldWhitelist = address(whitelist);
+    /// @inheritdoc IL1BlockContainer
+    function latestBaseFee() external view override returns (uint256) {
+        return metadata[latestBlockHash].baseFee;
+    }
 
-    whitelist = IWhitelist(_newWhitelist);
-    emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
-  }
+    /// @inheritdoc IL1BlockContainer
+    function latestBlockNumber() external view override returns (uint256) {
+        return metadata[latestBlockHash].height;
+    }
+
+    /// @inheritdoc IL1BlockContainer
+    function latestBlockTimestamp() external view override returns (uint256) {
+        return metadata[latestBlockHash].timestamp;
+    }
+
+    /// @inheritdoc IL1BlockContainer
+    function getStateRoot(bytes32 _blockHash) external view returns (bytes32) {
+        return stateRoot[_blockHash];
+    }
+
+    /// @inheritdoc IL1BlockContainer
+    function getBlockTimestamp(bytes32 _blockHash) external view returns (uint256) {
+        return metadata[_blockHash].timestamp;
+    }
+
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
+
+    /// @inheritdoc IL1BlockContainer
+    function importBlockHeader(
+        bytes32 _blockHash,
+        bytes calldata _blockHeaderRLP,
+        bool _updateGasPriceOracle
+    ) external {
+        // @todo remove this when ETH 2.0 signature verification is ready.
+        {
+            IWhitelist _whitelist = whitelist;
+            require(
+                address(_whitelist) == address(0) || _whitelist.isSenderAllowed(msg.sender),
+                "Not whitelisted sender"
+            );
+        }
+
+        // The encoding order in block header is
+        // 1. ParentHash: 32 bytes
+        // 2. UncleHash: 32 bytes
+        // 3. Coinbase: 20 bytes
+        // 4. StateRoot: 32 bytes
+        // 5. TransactionsRoot: 32 bytes
+        // 6. ReceiptsRoot: 32 bytes
+        // 7. LogsBloom: 256 bytes
+        // 8. Difficulty: uint
+        // 9. BlockHeight: uint
+        // 10. GasLimit: uint64
+        // 11. GasUsed: uint64
+        // 12. BlockTimestamp: uint64
+        // 13. ExtraData: several bytes
+        // 14. MixHash: 32 bytes
+        // 15. BlockNonce: 8 bytes
+        // 16. BaseFee: uint // optional
+        bytes32 _parentHash;
+        bytes32 _stateRoot;
+        uint64 _height;
+        uint64 _timestamp;
+        uint128 _baseFee;
+
+        assembly {
+            // reverts with error `msg`.
+            // make sure the length of error string <= 32
+            function revertWith(msg) {
+                // keccak("Error(string)")
+                mstore(0x00, shl(224, 0x08c379a0))
+                mstore(0x04, 0x20) // str.offset
+                mstore(0x44, msg)
+                let msgLen
+                for {
+
+                } msg {
+
+                } {
+                    msg := shl(8, msg)
+                    msgLen := add(msgLen, 1)
+                }
+                mstore(0x24, msgLen) // str.length
+                revert(0x00, 0x64)
+            }
+            // reverts with `msg` when condition is not matched.
+            // make sure the length of error string <= 32
+            function require(cond, msg) {
+                if iszero(cond) {
+                    revertWith(msg)
+                }
+            }
+            // returns the calldata offset of the value and the length in bytes
+            // for the RLP encoded data item at `ptr`. used in `decodeFlat`
+            function decodeValue(ptr) -> dataLen, valueOffset {
+                let b0 := byte(0, calldataload(ptr))
+
+                // 0x00 - 0x7f, single byte
+                if lt(b0, 0x80) {
+                    // for a single byte whose value is in the [0x00, 0x7f] range,
+                    // that byte is its own RLP encoding.
+                    dataLen := 1
+                    valueOffset := ptr
+                    leave
+                }
+
+                // 0x80 - 0xb7, short string/bytes, length <= 55
+                if lt(b0, 0xb8) {
+                    // the RLP encoding consists of a single byte with value 0x80
+                    // plus the length of the string followed by the string.
+                    dataLen := sub(b0, 0x80)
+                    valueOffset := add(ptr, 1)
+                    leave
+                }
+
+                // 0xb8 - 0xbf, long string/bytes, length > 55
+                if lt(b0, 0xc0) {
+                    // the RLP encoding consists of a single byte with value 0xb7
+                    // plus the length in bytes of the length of the string in binary form,
+                    // followed by the length of the string, followed by the string.
+                    let lengthBytes := sub(b0, 0xb7)
+                    if gt(lengthBytes, 4) {
+                        invalid()
+                    }
+
+                    // load the extended length
+                    valueOffset := add(ptr, 1)
+                    let extendedLen := calldataload(valueOffset)
+                    let bits := sub(256, mul(lengthBytes, 8))
+                    extendedLen := shr(bits, extendedLen)
+
+                    dataLen := extendedLen
+                    valueOffset := add(valueOffset, lengthBytes)
+                    leave
+                }
+
+                revertWith("Not value")
+            }
+
+            let ptr := _blockHeaderRLP.offset
+            let headerPayloadLength
+            {
+                let b0 := byte(0, calldataload(ptr))
+                // the input should be a long list
+                if lt(b0, 0xf8) {
+                    invalid()
+                }
+                let lengthBytes := sub(b0, 0xf7)
+                if gt(lengthBytes, 32) {
+                    invalid()
+                }
+                // load the extended length
+                ptr := add(ptr, 1)
+                headerPayloadLength := calldataload(ptr)
+                let bits := sub(256, mul(lengthBytes, 8))
+                // compute payload length: extended length + length bytes + 1
+                headerPayloadLength := shr(bits, headerPayloadLength)
+                headerPayloadLength := add(headerPayloadLength, lengthBytes)
+                headerPayloadLength := add(headerPayloadLength, 1)
+                ptr := add(ptr, lengthBytes)
+            }
+
+            let memPtr := mload(0x40)
+            calldatacopy(memPtr, _blockHeaderRLP.offset, headerPayloadLength)
+            let _computedBlockHash := keccak256(memPtr, headerPayloadLength)
+            require(eq(_blockHash, _computedBlockHash), "Block hash mismatch")
+
+            // load 16 vaules
+            for {
+                let i := 0
+            } lt(i, 16) {
+                i := add(i, 1)
+            } {
+                let len, offset := decodeValue(ptr)
+                // the value we care must have at most 32 bytes
+                if lt(len, 33) {
+                    let bits := mul(sub(32, len), 8)
+                    let value := calldataload(offset)
+                    value := shr(bits, value)
+                    mstore(memPtr, value)
+                }
+                memPtr := add(memPtr, 0x20)
+                ptr := add(len, offset)
+            }
+            require(eq(ptr, add(_blockHeaderRLP.offset, _blockHeaderRLP.length)), "Header RLP length mismatch")
+
+            memPtr := mload(0x40)
+            // load parent hash, 1-st entry
+            _parentHash := mload(memPtr)
+            // load state root, 4-th entry
+            _stateRoot := mload(add(memPtr, 0x60))
+            // load block height, 9-th entry
+            _height := mload(add(memPtr, 0x100))
+            // load block timestamp, 12-th entry
+            _timestamp := mload(add(memPtr, 0x160))
+            // load base fee, 16-th entry
+            _baseFee := mload(add(memPtr, 0x1e0))
+        }
+        require(stateRoot[_parentHash] != bytes32(0), "Parent not imported");
+        BlockMetadata memory _parentMetadata = metadata[_parentHash];
+        require(_parentMetadata.height + 1 == _height, "Block height mismatch");
+        require(_parentMetadata.timestamp <= _timestamp, "Parent block has larger timestamp");
+
+        latestBlockHash = _blockHash;
+        stateRoot[_blockHash] = _stateRoot;
+        metadata[_blockHash] = BlockMetadata(_height, _timestamp, _baseFee);
+
+        emit ImportBlock(_blockHash, _height, _timestamp, _baseFee, _stateRoot);
+
+        if (_updateGasPriceOracle) {
+            IL1GasPriceOracle(ScrollPredeploy.L1_GAS_PRICE_ORACLE).setL1BaseFee(_baseFee);
+        }
+    }
+
+    /************************
+     * Restricted Functions *
+     ************************/
+
+    /// @notice Update whitelist contract.
+    /// @dev This function can only called by contract owner.
+    /// @param _newWhitelist The address of new whitelist contract.
+    function updateWhitelist(address _newWhitelist) external onlyOwner {
+        address _oldWhitelist = address(whitelist);
+
+        whitelist = IWhitelist(_newWhitelist);
+        emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
+    }
 }

contracts/src/L2/predeploys/L1GasPriceOracle.sol

@@ -2,133 +2,133 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableBase } from "../../libraries/common/OwnableBase.sol";
-import { IWhitelist } from "../../libraries/common/IWhitelist.sol";
+import {OwnableBase} from "../../libraries/common/OwnableBase.sol";
+import {IWhitelist} from "../../libraries/common/IWhitelist.sol";
 
-import { IL1BlockContainer } from "./IL1BlockContainer.sol";
-import { IL1GasPriceOracle } from "./IL1GasPriceOracle.sol";
+import {IL1BlockContainer} from "./IL1BlockContainer.sol";
+import {IL1GasPriceOracle} from "./IL1GasPriceOracle.sol";
 
 contract L1GasPriceOracle is OwnableBase, IL1GasPriceOracle {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when owner updates whitelist contract.
-  /// @param _oldWhitelist The address of old whitelist contract.
-  /// @param _newWhitelist The address of new whitelist contract.
-  event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);
+    /// @notice Emitted when owner updates whitelist contract.
+    /// @param _oldWhitelist The address of old whitelist contract.
+    /// @param _newWhitelist The address of new whitelist contract.
+    event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);
 
-  /*************
-   * Constants *
-   *************/
+    /*************
+     * Constants *
+     *************/
 
-  /// @dev The precision used in the scalar.
-  uint256 private constant PRECISION = 1e9;
+    /// @dev The precision used in the scalar.
+    uint256 private constant PRECISION = 1e9;
 
-  /// @dev The maximum possible l1 fee overhead.
-  ///      Computed based on current l1 block gas limit.
-  uint256 private constant MAX_OVERHEAD = 30000000 / 16;
+    /// @dev The maximum possible l1 fee overhead.
+    ///      Computed based on current l1 block gas limit.
+    uint256 private constant MAX_OVERHEAD = 30000000 / 16;
 
-  /// @dev The maximum possible l1 fee scale.
-  ///      x1000 should be enough.
-  uint256 private constant MAX_SCALE = 1000 * PRECISION;
+    /// @dev The maximum possible l1 fee scale.
+    ///      x1000 should be enough.
+    uint256 private constant MAX_SCALE = 1000 * PRECISION;
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @inheritdoc IL1GasPriceOracle
-  uint256 public l1BaseFee;
+    /// @inheritdoc IL1GasPriceOracle
+    uint256 public l1BaseFee;
 
-  /// @inheritdoc IL1GasPriceOracle
-  uint256 public override overhead;
+    /// @inheritdoc IL1GasPriceOracle
+    uint256 public override overhead;
 
-  /// @inheritdoc IL1GasPriceOracle
-  uint256 public override scalar;
+    /// @inheritdoc IL1GasPriceOracle
+    uint256 public override scalar;
 
-  /// @notice The address of whitelist contract.
-  IWhitelist public whitelist;
+    /// @notice The address of whitelist contract.
+    IWhitelist public whitelist;
 
-  /***************
-   * Constructor *
-   ***************/
+    /***************
+     * Constructor *
+     ***************/
 
-  constructor(address _owner) {
-    _transferOwnership(_owner);
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IL1GasPriceOracle
-  function getL1Fee(bytes memory _data) external view override returns (uint256) {
-    uint256 _l1GasUsed = getL1GasUsed(_data);
-    uint256 _l1Fee = _l1GasUsed * l1BaseFee;
-    return (_l1Fee * scalar) / PRECISION;
-  }
-
-  /// @inheritdoc IL1GasPriceOracle
-  /// @dev See the comments in `OVM_GasPriceOracle1` for more details
-  ///      https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts/contracts/L2/predeploys/OVM_GasPriceOracle.sol
-  function getL1GasUsed(bytes memory _data) public view override returns (uint256) {
-    uint256 _total = 0;
-    uint256 _length = _data.length;
-    unchecked {
-      for (uint256 i = 0; i < _length; i++) {
-        if (_data[i] == 0) {
-          _total += 4;
-        } else {
-          _total += 16;
-        }
-      }
-      uint256 _unsigned = _total + overhead;
-      return _unsigned + (68 * 16);
+    constructor(address _owner) {
+        _transferOwnership(_owner);
     }
-  }
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @inheritdoc IL1GasPriceOracle
-  function setL1BaseFee(uint256 _l1BaseFee) external override {
-    require(whitelist.isSenderAllowed(msg.sender), "Not whitelisted sender");
+    /// @inheritdoc IL1GasPriceOracle
+    function getL1Fee(bytes memory _data) external view override returns (uint256) {
+        uint256 _l1GasUsed = getL1GasUsed(_data);
+        uint256 _l1Fee = _l1GasUsed * l1BaseFee;
+        return (_l1Fee * scalar) / PRECISION;
+    }
 
-    l1BaseFee = _l1BaseFee;
+    /// @inheritdoc IL1GasPriceOracle
+    /// @dev See the comments in `OVM_GasPriceOracle1` for more details
+    ///      https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts/contracts/L2/predeploys/OVM_GasPriceOracle.sol
+    function getL1GasUsed(bytes memory _data) public view override returns (uint256) {
+        uint256 _total = 0;
+        uint256 _length = _data.length;
+        unchecked {
+            for (uint256 i = 0; i < _length; i++) {
+                if (_data[i] == 0) {
+                    _total += 4;
+                } else {
+                    _total += 16;
+                }
+            }
+            uint256 _unsigned = _total + overhead;
+            return _unsigned + (68 * 16);
+        }
+    }
 
-    emit L1BaseFeeUpdated(_l1BaseFee);
-  }
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /************************
-   * Restricted Functions *
-   ************************/
+    /// @inheritdoc IL1GasPriceOracle
+    function setL1BaseFee(uint256 _l1BaseFee) external override {
+        require(whitelist.isSenderAllowed(msg.sender), "Not whitelisted sender");
 
-  /// @notice Allows the owner to modify the overhead.
-  /// @param _overhead New overhead
-  function setOverhead(uint256 _overhead) external onlyOwner {
-    require(_overhead <= MAX_OVERHEAD, "exceed maximum overhead");
+        l1BaseFee = _l1BaseFee;
 
-    overhead = _overhead;
-    emit OverheadUpdated(_overhead);
-  }
+        emit L1BaseFeeUpdated(_l1BaseFee);
+    }
 
-  /// Allows the owner to modify the scalar.
-  /// @param _scalar New scalar
-  function setScalar(uint256 _scalar) external onlyOwner {
-    require(_scalar <= MAX_SCALE, "exceed maximum scale");
+    /************************
+     * Restricted Functions *
+     ************************/
 
-    scalar = _scalar;
-    emit ScalarUpdated(_scalar);
-  }
+    /// @notice Allows the owner to modify the overhead.
+    /// @param _overhead New overhead
+    function setOverhead(uint256 _overhead) external onlyOwner {
+        require(_overhead <= MAX_OVERHEAD, "exceed maximum overhead");
 
-  /// @notice Update whitelist contract.
-  /// @dev This function can only called by contract owner.
-  /// @param _newWhitelist The address of new whitelist contract.
-  function updateWhitelist(address _newWhitelist) external onlyOwner {
-    address _oldWhitelist = address(whitelist);
+        overhead = _overhead;
+        emit OverheadUpdated(_overhead);
+    }
 
-    whitelist = IWhitelist(_newWhitelist);
-    emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
-  }
+    /// Allows the owner to modify the scalar.
+    /// @param _scalar New scalar
+    function setScalar(uint256 _scalar) external onlyOwner {
+        require(_scalar <= MAX_SCALE, "exceed maximum scale");
+
+        scalar = _scalar;
+        emit ScalarUpdated(_scalar);
+    }
+
+    /// @notice Update whitelist contract.
+    /// @dev This function can only called by contract owner.
+    /// @param _newWhitelist The address of new whitelist contract.
+    function updateWhitelist(address _newWhitelist) external onlyOwner {
+        address _oldWhitelist = address(whitelist);
+
+        whitelist = IWhitelist(_newWhitelist);
+        emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
+    }
 }

contracts/src/L2/predeploys/L2MessageQueue.sol

@@ -2,8 +2,8 @@
 
 pragma solidity ^0.8.0;
 
-import { AppendOnlyMerkleTree } from "../../libraries/common/AppendOnlyMerkleTree.sol";
-import { OwnableBase } from "../../libraries/common/OwnableBase.sol";
+import {AppendOnlyMerkleTree} from "../../libraries/common/AppendOnlyMerkleTree.sol";
+import {OwnableBase} from "../../libraries/common/OwnableBase.sol";
 
 /// @title L2MessageQueue
 /// @notice The original idea is from Optimism, see [OVM_L2ToL1MessagePasser](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts/contracts/L2/predeploys/OVM_L2ToL1MessagePasser.sol).
@@ -12,41 +12,41 @@ import { OwnableBase } from "../../libraries/common/OwnableBase.sol";
 /// _verifyStorageProof function, which verifies the existence of the transaction hash in this
 /// contract's `sentMessages` mapping.
 contract L2MessageQueue is AppendOnlyMerkleTree, OwnableBase {
-  /// @notice Emitted when a new message is added to the merkle tree.
-  /// @param index The index of the corresponding message.
-  /// @param messageHash The hash of the corresponding message.
-  event AppendMessage(uint256 index, bytes32 messageHash);
+    /// @notice Emitted when a new message is added to the merkle tree.
+    /// @param index The index of the corresponding message.
+    /// @param messageHash The hash of the corresponding message.
+    event AppendMessage(uint256 index, bytes32 messageHash);
 
-  /// @notice The address of L2ScrollMessenger contract.
-  address public messenger;
+    /// @notice The address of L2ScrollMessenger contract.
+    address public messenger;
 
-  constructor(address _owner) {
-    _transferOwnership(_owner);
-  }
+    constructor(address _owner) {
+        _transferOwnership(_owner);
+    }
 
-  function initialize() external {
-    _initializeMerkleTree();
-  }
+    function initialize() external {
+        _initializeMerkleTree();
+    }
 
-  /// @notice record the message to merkle tree and compute the new root.
-  /// @param _messageHash The hash of the new added message.
-  function appendMessage(bytes32 _messageHash) external returns (bytes32) {
-    require(msg.sender == messenger, "only messenger");
+    /// @notice record the message to merkle tree and compute the new root.
+    /// @param _messageHash The hash of the new added message.
+    function appendMessage(bytes32 _messageHash) external returns (bytes32) {
+        require(msg.sender == messenger, "only messenger");
 
-    (uint256 _currentNonce, bytes32 _currentRoot) = _appendMessageHash(_messageHash);
+        (uint256 _currentNonce, bytes32 _currentRoot) = _appendMessageHash(_messageHash);
 
-    // We can use the event to compute the merkle tree locally.
-    emit AppendMessage(_currentNonce, _messageHash);
+        // We can use the event to compute the merkle tree locally.
+        emit AppendMessage(_currentNonce, _messageHash);
 
-    return _currentRoot;
-  }
+        return _currentRoot;
+    }
 
-  /// @notice Update the address of messenger.
-  /// @dev You are not allowed to update messenger when there are some messages appended.
-  /// @param _messenger The address of messenger to update.
-  function updateMessenger(address _messenger) external onlyOwner {
-    require(nextMessageIndex == 0, "cannot update messenger");
+    /// @notice Update the address of messenger.
+    /// @dev You are not allowed to update messenger when there are some messages appended.
+    /// @param _messenger The address of messenger to update.
+    function updateMessenger(address _messenger) external onlyOwner {
+        require(nextMessageIndex == 0, "cannot update messenger");
 
-    messenger = _messenger;
-  }
+        messenger = _messenger;
+    }
 }

contracts/src/L2/predeploys/L2TxFeeVault.sol

@@ -2,13 +2,13 @@
 
 pragma solidity ^0.8.0;
 
-import { FeeVault } from "../../libraries/FeeVault.sol";
+import {FeeVault} from "../../libraries/FeeVault.sol";
 
 /// @title L2TxFeeVault
 /// @notice The `L2TxFeeVault` contract collects all L2 transaction fees and allows withdrawing these fees to a predefined L1 address.
 /// The minimum withdrawal amount is 10 ether.
 contract L2TxFeeVault is FeeVault {
-  /// @param _owner The owner of the contract.
-  /// @param _recipient The fee recipient address on L1.
-  constructor(address _owner, address _recipient) FeeVault(_owner, _recipient, 10 ether) {}
+    /// @param _owner The owner of the contract.
+    /// @param _recipient The fee recipient address on L1.
+    constructor(address _owner, address _recipient) FeeVault(_owner, _recipient, 10 ether) {}
 }

contracts/src/L2/predeploys/WETH9.sol

@@ -20,82 +20,82 @@ pragma solidity ^0.8.0;
 // solhint-disable reason-string
 
 contract WETH9 {
-  string public name = "Wrapped Ether";
-  string public symbol = "WETH";
-  uint8 public decimals = 18;
+    string public name = "Wrapped Ether";
+    string public symbol = "WETH";
+    uint8 public decimals = 18;
 
-  event Approval(address indexed src, address indexed guy, uint256 wad);
-  event Transfer(address indexed src, address indexed dst, uint256 wad);
-  event Deposit(address indexed dst, uint256 wad);
-  event Withdrawal(address indexed src, uint256 wad);
+    event Approval(address indexed src, address indexed guy, uint256 wad);
+    event Transfer(address indexed src, address indexed dst, uint256 wad);
+    event Deposit(address indexed dst, uint256 wad);
+    event Withdrawal(address indexed src, uint256 wad);
 
-  mapping(address => uint256) public balanceOf;
-  mapping(address => mapping(address => uint256)) public allowance;
+    mapping(address => uint256) public balanceOf;
+    mapping(address => mapping(address => uint256)) public allowance;
 
-  receive() external payable {
-    deposit();
-  }
-
-  function deposit() public payable {
-    unchecked {
-      balanceOf[msg.sender] += msg.value;
+    receive() external payable {
+        deposit();
     }
 
-    emit Deposit(msg.sender, msg.value);
-  }
+    function deposit() public payable {
+        unchecked {
+            balanceOf[msg.sender] += msg.value;
+        }
 
-  function withdraw(uint256 wad) public {
-    require(balanceOf[msg.sender] >= wad);
-
-    unchecked {
-      balanceOf[msg.sender] -= wad;
+        emit Deposit(msg.sender, msg.value);
     }
 
-    payable(msg.sender).transfer(wad);
+    function withdraw(uint256 wad) public {
+        require(balanceOf[msg.sender] >= wad);
 
-    emit Withdrawal(msg.sender, wad);
-  }
+        unchecked {
+            balanceOf[msg.sender] -= wad;
+        }
 
-  function totalSupply() public view returns (uint256) {
-    return address(this).balance;
-  }
+        payable(msg.sender).transfer(wad);
 
-  function approve(address guy, uint256 wad) public returns (bool) {
-    allowance[msg.sender][guy] = wad;
-
-    emit Approval(msg.sender, guy, wad);
-
-    return true;
-  }
-
-  function transfer(address dst, uint256 wad) public returns (bool) {
-    return transferFrom(msg.sender, dst, wad);
-  }
-
-  function transferFrom(
-    address src,
-    address dst,
-    uint256 wad
-  ) public returns (bool) {
-    require(balanceOf[src] >= wad);
-
-    if (src != msg.sender && allowance[src][msg.sender] != type(uint256).max) {
-      require(allowance[src][msg.sender] >= wad);
-
-      unchecked {
-        allowance[src][msg.sender] -= wad;
-      }
+        emit Withdrawal(msg.sender, wad);
     }
 
-    unchecked {
-      balanceOf[src] -= wad;
-      balanceOf[dst] += wad;
+    function totalSupply() public view returns (uint256) {
+        return address(this).balance;
     }
 
-    emit Transfer(src, dst, wad);
+    function approve(address guy, uint256 wad) public returns (bool) {
+        allowance[msg.sender][guy] = wad;
 
-    return true;
-  }
+        emit Approval(msg.sender, guy, wad);
+
+        return true;
+    }
+
+    function transfer(address dst, uint256 wad) public returns (bool) {
+        return transferFrom(msg.sender, dst, wad);
+    }
+
+    function transferFrom(
+        address src,
+        address dst,
+        uint256 wad
+    ) public returns (bool) {
+        require(balanceOf[src] >= wad);
+
+        if (src != msg.sender && allowance[src][msg.sender] != type(uint256).max) {
+            require(allowance[src][msg.sender] >= wad);
+
+            unchecked {
+                allowance[src][msg.sender] -= wad;
+            }
+        }
+
+        unchecked {
+            balanceOf[src] -= wad;
+            balanceOf[dst] += wad;
+        }
+
+        emit Transfer(src, dst, wad);
+
+        return true;
+    }
 }
 
 /*

contracts/src/L2/predeploys/Whitelist.sol

@@ -2,34 +2,34 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableBase } from "../../libraries/common/OwnableBase.sol";
-import { IWhitelist } from "../../libraries/common/IWhitelist.sol";
+import {OwnableBase} from "../../libraries/common/OwnableBase.sol";
+import {IWhitelist} from "../../libraries/common/IWhitelist.sol";
 
 contract Whitelist is OwnableBase, IWhitelist {
-  /// @notice Emitted when account whitelist status changed.
-  /// @param _account The address of account whose status is changed.
-  /// @param _status The current whitelist status.
-  event WhitelistStatusChanged(address indexed _account, bool _status);
+    /// @notice Emitted when account whitelist status changed.
+    /// @param _account The address of account whose status is changed.
+    /// @param _status The current whitelist status.
+    event WhitelistStatusChanged(address indexed _account, bool _status);
 
-  /// @notice Keep track whether the account is whitelisted.
-  mapping(address => bool) private isWhitelisted;
+    /// @notice Keep track whether the account is whitelisted.
+    mapping(address => bool) private isWhitelisted;
 
-  constructor(address _owner) {
-    owner = _owner;
-  }
-
-  /// @notice See {IWhitelist-isSenderAllowed}
-  function isSenderAllowed(address _sender) external view returns (bool) {
-    return isWhitelisted[_sender];
-  }
-
-  /// @notice Update the whitelist status
-  /// @param _accounts The list of addresses to update.
-  /// @param _status The whitelist status to update.
-  function updateWhitelistStatus(address[] memory _accounts, bool _status) external onlyOwner {
-    for (uint256 i = 0; i < _accounts.length; i++) {
-      isWhitelisted[_accounts[i]] = _status;
-      emit WhitelistStatusChanged(_accounts[i], _status);
+    constructor(address _owner) {
+        owner = _owner;
+    }
+
+    /// @notice See {IWhitelist-isSenderAllowed}
+    function isSenderAllowed(address _sender) external view returns (bool) {
+        return isWhitelisted[_sender];
+    }
+
+    /// @notice Update the whitelist status
+    /// @param _accounts The list of addresses to update.
+    /// @param _status The whitelist status to update.
+    function updateWhitelistStatus(address[] memory _accounts, bool _status) external onlyOwner {
+        for (uint256 i = 0; i < _accounts.length; i++) {
+            isWhitelisted[_accounts[i]] = _status;
+            emit WhitelistStatusChanged(_accounts[i], _status);
+        }
     }
-  }
 }

contracts/src/interfaces/IERC20Metadata.sol

@@ -3,9 +3,9 @@
 pragma solidity ^0.8.0;
 
 interface IERC20Metadata {
-  function symbol() external view returns (string memory);
+    function symbol() external view returns (string memory);
 
-  function name() external view returns (string memory);
+    function name() external view returns (string memory);
 
-  function decimals() external view returns (uint8);
+    function decimals() external view returns (uint8);
 }

contracts/src/interfaces/IWETH.sol

@@ -3,7 +3,7 @@
 pragma solidity ^0.8.0;
 
 interface IWETH {
-  function deposit() external payable;
+    function deposit() external payable;
 
-  function withdraw(uint256 wad) external;
+    function withdraw(uint256 wad) external;
 }

contracts/src/libraries/FeeVault.sol

@@ -25,85 +25,88 @@
 
 pragma solidity ^0.8.0;
 
-import { IL2ScrollMessenger } from "../L2/IL2ScrollMessenger.sol";
-import { OwnableBase } from "./common/OwnableBase.sol";
+import {IL2ScrollMessenger} from "../L2/IL2ScrollMessenger.sol";
+import {OwnableBase} from "./common/OwnableBase.sol";
 
 /// @title FeeVault
 /// @notice The FeeVault contract contains the basic logic for the various different vault contracts
 ///         used to hold fee revenue generated by the L2 system.
 abstract contract FeeVault is OwnableBase {
-  /// @notice Emits each time that a withdrawal occurs.
-  ///
-  /// @param value Amount that was withdrawn (in wei).
-  /// @param to    Address that the funds were sent to.
-  /// @param from  Address that triggered the withdrawal.
-  event Withdrawal(uint256 value, address to, address from);
+    /// @notice Emits each time that a withdrawal occurs.
+    ///
+    /// @param value Amount that was withdrawn (in wei).
+    /// @param to    Address that the funds were sent to.
+    /// @param from  Address that triggered the withdrawal.
+    event Withdrawal(uint256 value, address to, address from);
 
-  /// @notice Minimum balance before a withdrawal can be triggered.
-  uint256 public minWithdrawAmount;
+    /// @notice Minimum balance before a withdrawal can be triggered.
+    uint256 public minWithdrawAmount;
 
-  /// @notice Scroll L2 messenger address.
-  address public messenger;
+    /// @notice Scroll L2 messenger address.
+    address public messenger;
 
-  /// @notice Wallet that will receive the fees on L1.
-  address public recipient;
+    /// @notice Wallet that will receive the fees on L1.
+    address public recipient;
 
-  /// @notice Total amount of wei processed by the contract.
-  uint256 public totalProcessed;
+    /// @notice Total amount of wei processed by the contract.
+    uint256 public totalProcessed;
 
-  /// @param _owner               The owner of the contract.
-  /// @param _recipient           Wallet that will receive the fees on L1.
-  /// @param _minWithdrawalAmount Minimum balance before a withdrawal can be triggered.
-  constructor(
-    address _owner,
-    address _recipient,
-    uint256 _minWithdrawalAmount
-  ) {
-    _transferOwnership(_owner);
+    /// @param _owner               The owner of the contract.
+    /// @param _recipient           Wallet that will receive the fees on L1.
+    /// @param _minWithdrawalAmount Minimum balance before a withdrawal can be triggered.
+    constructor(
+        address _owner,
+        address _recipient,
+        uint256 _minWithdrawalAmount
+    ) {
+        _transferOwnership(_owner);
 
-    minWithdrawAmount = _minWithdrawalAmount;
-    recipient = _recipient;
-  }
-
-  /// @notice Allow the contract to receive ETH.
-  receive() external payable {}
-
-  /// @notice Triggers a withdrawal of funds to the L1 fee wallet.
-  function withdraw() external {
-    uint256 value = address(this).balance;
-
-    require(value >= minWithdrawAmount, "FeeVault: withdrawal amount must be greater than minimum withdrawal amount");
-
-    unchecked {
-      totalProcessed += value;
+        minWithdrawAmount = _minWithdrawalAmount;
+        recipient = _recipient;
     }
 
-    emit Withdrawal(value, recipient, msg.sender);
+    /// @notice Allow the contract to receive ETH.
+    receive() external payable {}
 
-    // no fee provided
-    IL2ScrollMessenger(messenger).sendMessage{ value: value }(
-      recipient,
-      value,
-      bytes(""), // no message (simple eth transfer)
-      0 // _gasLimit can be zero for fee vault.
-    );
-  }
+    /// @notice Triggers a withdrawal of funds to the L1 fee wallet.
+    function withdraw() external {
+        uint256 value = address(this).balance;
 
-  /// @notice Update the address of messenger.
-  /// @param _messenger The address of messenger to update.
-  function updateMessenger(address _messenger) external onlyOwner {
-    messenger = _messenger;
-  }
+        require(
+            value >= minWithdrawAmount,
+            "FeeVault: withdrawal amount must be greater than minimum withdrawal amount"
+        );
 
-  /// @notice Update the address of recipient.
-  /// @param _recipient The address of recipient to update.
-  function updateRecipient(address _recipient) external onlyOwner {
-    recipient = _recipient;
-  }
+        unchecked {
+            totalProcessed += value;
+        }
 
-  /// @notice Update the minimum withdraw amount.
-  /// @param _minWithdrawAmount The minimum withdraw amount to update.
-  function updateMinWithdrawAmount(uint256 _minWithdrawAmount) external onlyOwner {
-    minWithdrawAmount = _minWithdrawAmount;
-  }
+        emit Withdrawal(value, recipient, msg.sender);
+
+        // no fee provided
+        IL2ScrollMessenger(messenger).sendMessage{value: value}(
+            recipient,
+            value,
+            bytes(""), // no message (simple eth transfer)
+            0 // _gasLimit can be zero for fee vault.
+        );
+    }
+
+    /// @notice Update the address of messenger.
+    /// @param _messenger The address of messenger to update.
+    function updateMessenger(address _messenger) external onlyOwner {
+        messenger = _messenger;
+    }
+
+    /// @notice Update the address of recipient.
+    /// @param _recipient The address of recipient to update.
+    function updateRecipient(address _recipient) external onlyOwner {
+        recipient = _recipient;
+    }
+
+    /// @notice Update the minimum withdraw amount.
+    /// @param _minWithdrawAmount The minimum withdraw amount to update.
+    function updateMinWithdrawAmount(uint256 _minWithdrawAmount) external onlyOwner {
+        minWithdrawAmount = _minWithdrawAmount;
+    }
 }

contracts/src/libraries/IScrollMessenger.sol

@@ -3,54 +3,68 @@
 pragma solidity ^0.8.0;
 
 interface IScrollMessenger {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when a cross domain message is sent.
-  /// @param sender The address of the sender who initiates the message.
-  /// @param target The address of target contract to call.
-  /// @param value The amount of value passed to the target contract.
-  /// @param messageNonce The nonce of the message.
-  /// @param gasLimit The optional gas limit passed to L1 or L2.
-  /// @param message The calldata passed to the target contract.
-  event SentMessage(
-    address indexed sender,
-    address indexed target,
-    uint256 value,
-    uint256 messageNonce,
-    uint256 gasLimit,
-    bytes message
-  );
+    /// @notice Emitted when a cross domain message is sent.
+    /// @param sender The address of the sender who initiates the message.
+    /// @param target The address of target contract to call.
+    /// @param value The amount of value passed to the target contract.
+    /// @param messageNonce The nonce of the message.
+    /// @param gasLimit The optional gas limit passed to L1 or L2.
+    /// @param message The calldata passed to the target contract.
+    event SentMessage(
+        address indexed sender,
+        address indexed target,
+        uint256 value,
+        uint256 messageNonce,
+        uint256 gasLimit,
+        bytes message
+    );
 
-  /// @notice Emitted when a cross domain message is relayed successfully.
-  /// @param messageHash The hash of the message.
-  event RelayedMessage(bytes32 indexed messageHash);
+    /// @notice Emitted when a cross domain message is relayed successfully.
+    /// @param messageHash The hash of the message.
+    event RelayedMessage(bytes32 indexed messageHash);
 
-  /// @notice Emitted when a cross domain message is failed to relay.
-  /// @param messageHash The hash of the message.
-  event FailedRelayedMessage(bytes32 indexed messageHash);
+    /// @notice Emitted when a cross domain message is failed to relay.
+    /// @param messageHash The hash of the message.
+    event FailedRelayedMessage(bytes32 indexed messageHash);
 
-  /*************************
-   * Public View Functions *
-   *************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Return the sender of a cross domain message.
-  function xDomainMessageSender() external view returns (address);
+    /// @notice Return the sender of a cross domain message.
+    function xDomainMessageSender() external view returns (address);
 
-  /****************************
-   * Public Mutated Functions *
-   ****************************/
+    /*****************************
+     * Public Mutating Functions *
+     *****************************/
 
-  /// @notice Send cross chain message from L1 to L2 or L2 to L1.
-  /// @param target The address of account who recieve the message.
-  /// @param value The amount of ether passed when call target contract.
-  /// @param message The content of the message.
-  /// @param gasLimit Gas limit required to complete the message relay on corresponding chain.
-  function sendMessage(
-    address target,
-    uint256 value,
-    bytes calldata message,
-    uint256 gasLimit
-  ) external payable;
+    /// @notice Send cross chain message from L1 to L2 or L2 to L1.
+    /// @param target The address of account who recieve the message.
+    /// @param value The amount of ether passed when call target contract.
+    /// @param message The content of the message.
+    /// @param gasLimit Gas limit required to complete the message relay on corresponding chain.
+    function sendMessage(
+        address target,
+        uint256 value,
+        bytes calldata message,
+        uint256 gasLimit
+    ) external payable;
+
+    /// @notice Send cross chain message from L1 to L2 or L2 to L1.
+    /// @param target The address of account who recieve the message.
+    /// @param value The amount of ether passed when call target contract.
+    /// @param message The content of the message.
+    /// @param gasLimit Gas limit required to complete the message relay on corresponding chain.
+    /// @param refundAddress The address of account who will receive the refunded fee.
+    function sendMessage(
+        address target,
+        uint256 value,
+        bytes calldata message,
+        uint256 gasLimit,
+        address refundAddress
+    ) external payable;
 }

contracts/src/libraries/ScrollMessengerBase.sol

@@ -2,120 +2,128 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
 
-import { IWhitelist } from "./common/IWhitelist.sol";
-import { ScrollConstants } from "./constants/ScrollConstants.sol";
-import { IScrollMessenger } from "./IScrollMessenger.sol";
+import {IWhitelist} from "./common/IWhitelist.sol";
+import {ScrollConstants} from "./constants/ScrollConstants.sol";
+import {IScrollMessenger} from "./IScrollMessenger.sol";
 
 abstract contract ScrollMessengerBase is OwnableUpgradeable, IScrollMessenger {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when owner updates whitelist contract.
-  /// @param _oldWhitelist The address of old whitelist contract.
-  /// @param _newWhitelist The address of new whitelist contract.
-  event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);
+    /// @notice Emitted when owner updates whitelist contract.
+    /// @param _oldWhitelist The address of old whitelist contract.
+    /// @param _newWhitelist The address of new whitelist contract.
+    event UpdateWhitelist(address _oldWhitelist, address _newWhitelist);
 
-  /// @notice Emitted when owner updates fee vault contract.
-  /// @param _oldFeeVault The address of old fee vault contract.
-  /// @param _newFeeVault The address of new fee vault contract.
-  event UpdateFeeVault(address _oldFeeVault, address _newFeeVault);
+    /// @notice Emitted when owner updates fee vault contract.
+    /// @param _oldFeeVault The address of old fee vault contract.
+    /// @param _newFeeVault The address of new fee vault contract.
+    event UpdateFeeVault(address _oldFeeVault, address _newFeeVault);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Constants *
+     *************/
 
-  /// @notice See {IScrollMessenger-xDomainMessageSender}
-  address public override xDomainMessageSender;
+    // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.5.0/contracts/security/ReentrancyGuard.sol
+    uint256 internal constant _NOT_ENTERED = 1;
+    uint256 internal constant _ENTERED = 2;
 
-  /// @notice The whitelist contract to track the sender who can call `sendMessage` in ScrollMessenger.
-  address public whitelist;
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice The address of counterpart ScrollMessenger contract in L1/L2.
-  address public counterpart;
+    /// @notice See {IScrollMessenger-xDomainMessageSender}
+    address public override xDomainMessageSender;
 
-  /// @notice The address of fee vault, collecting cross domain messaging fee.
-  address public feeVault;
+    /// @notice The whitelist contract to track the sender who can call `sendMessage` in ScrollMessenger.
+    address public whitelist;
 
-  /**********************
-   * Function Modifiers *
-   **********************/
+    /// @notice The address of counterpart ScrollMessenger contract in L1/L2.
+    address public counterpart;
 
-  modifier onlyWhitelistedSender(address _sender) {
-    address _whitelist = whitelist;
-    require(_whitelist == address(0) || IWhitelist(_whitelist).isSenderAllowed(_sender), "sender not whitelisted");
-    _;
-  }
+    /// @notice The address of fee vault, collecting cross domain messaging fee.
+    address public feeVault;
 
-  /***************
-   * Constructor *
-   ***************/
+    /**********************
+     * Function Modifiers *
+     **********************/
 
-  function _initialize(address _counterpart, address _feeVault) internal {
-    OwnableUpgradeable.__Ownable_init();
+    modifier onlyWhitelistedSender(address _sender) {
+        address _whitelist = whitelist;
+        require(_whitelist == address(0) || IWhitelist(_whitelist).isSenderAllowed(_sender), "sender not whitelisted");
+        _;
+    }
 
-    // initialize to a nonzero value
-    xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
+    /***************
+     * Constructor *
+     ***************/
 
-    counterpart = _counterpart;
-    feeVault = _feeVault;
-  }
+    function _initialize(address _counterpart, address _feeVault) internal {
+        OwnableUpgradeable.__Ownable_init();
 
-  // allow others to send ether to messenger
-  receive() external payable {}
+        // initialize to a nonzero value
+        xDomainMessageSender = ScrollConstants.DEFAULT_XDOMAIN_MESSAGE_SENDER;
 
-  /************************
-   * Restricted Functions *
-   ************************/
+        counterpart = _counterpart;
+        feeVault = _feeVault;
+    }
 
-  /// @notice Update whitelist contract.
-  /// @dev This function can only called by contract owner.
-  /// @param _newWhitelist The address of new whitelist contract.
-  function updateWhitelist(address _newWhitelist) external onlyOwner {
-    address _oldWhitelist = whitelist;
+    // allow others to send ether to messenger
+    receive() external payable {}
 
-    whitelist = _newWhitelist;
-    emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
-  }
+    /************************
+     * Restricted Functions *
+     ************************/
 
-  /// @notice Update fee vault contract.
-  /// @dev This function can only called by contract owner.
-  /// @param _newFeeVault The address of new fee vault contract.
-  function updateFeeVault(address _newFeeVault) external onlyOwner {
-    address _oldFeeVault = whitelist;
+    /// @notice Update whitelist contract.
+    /// @dev This function can only called by contract owner.
+    /// @param _newWhitelist The address of new whitelist contract.
+    function updateWhitelist(address _newWhitelist) external onlyOwner {
+        address _oldWhitelist = whitelist;
 
-    feeVault = _newFeeVault;
-    emit UpdateFeeVault(_oldFeeVault, _newFeeVault);
-  }
+        whitelist = _newWhitelist;
+        emit UpdateWhitelist(_oldWhitelist, _newWhitelist);
+    }
 
-  /**********************
-   * Internal Functions *
-   **********************/
+    /// @notice Update fee vault contract.
+    /// @dev This function can only called by contract owner.
+    /// @param _newFeeVault The address of new fee vault contract.
+    function updateFeeVault(address _newFeeVault) external onlyOwner {
+        address _oldFeeVault = whitelist;
 
-  /// @dev Internal function to generate the correct cross domain calldata for a message.
-  /// @param _sender Message sender address.
-  /// @param _target Target contract address.
-  /// @param _value The amount of ETH pass to the target.
-  /// @param _messageNonce Nonce for the provided message.
-  /// @param _message Message to send to the target.
-  /// @return ABI encoded cross domain calldata.
-  function _encodeXDomainCalldata(
-    address _sender,
-    address _target,
-    uint256 _value,
-    uint256 _messageNonce,
-    bytes memory _message
-  ) internal pure returns (bytes memory) {
-    return
-      abi.encodeWithSignature(
-        "relayMessage(address,address,uint256,uint256,bytes)",
-        _sender,
-        _target,
-        _value,
-        _messageNonce,
-        _message
-      );
-  }
+        feeVault = _newFeeVault;
+        emit UpdateFeeVault(_oldFeeVault, _newFeeVault);
+    }
+
+    /**********************
+     * Internal Functions *
+     **********************/
+
+    /// @dev Internal function to generate the correct cross domain calldata for a message.
+    /// @param _sender Message sender address.
+    /// @param _target Target contract address.
+    /// @param _value The amount of ETH pass to the target.
+    /// @param _messageNonce Nonce for the provided message.
+    /// @param _message Message to send to the target.
+    /// @return ABI encoded cross domain calldata.
+    function _encodeXDomainCalldata(
+        address _sender,
+        address _target,
+        uint256 _value,
+        uint256 _messageNonce,
+        bytes memory _message
+    ) internal pure returns (bytes memory) {
+        return
+            abi.encodeWithSignature(
+                "relayMessage(address,address,uint256,uint256,bytes)",
+                _sender,
+                _target,
+                _value,
+                _messageNonce,
+                _message
+            );
+    }
 }

contracts/src/libraries/common/AddressAliasHelper.sol

@@ -3,25 +3,25 @@
 pragma solidity ^0.8.0;
 
 library AddressAliasHelper {
-  uint160 constant offset = uint160(0x1111000000000000000000000000000000001111);
+    uint160 constant offset = uint160(0x1111000000000000000000000000000000001111);
 
-  /// @notice Utility function that converts the address in the L1 that submitted a tx to
-  /// the inbox to the msg.sender viewed in the L2
-  /// @param l1Address the address in the L1 that triggered the tx to L2
-  /// @return l2Address L2 address as viewed in msg.sender
-  function applyL1ToL2Alias(address l1Address) internal pure returns (address l2Address) {
-    unchecked {
-      l2Address = address(uint160(l1Address) + offset);
+    /// @notice Utility function that converts the address in the L1 that submitted a tx to
+    /// the inbox to the msg.sender viewed in the L2
+    /// @param l1Address the address in the L1 that triggered the tx to L2
+    /// @return l2Address L2 address as viewed in msg.sender
+    function applyL1ToL2Alias(address l1Address) internal pure returns (address l2Address) {
+        unchecked {
+            l2Address = address(uint160(l1Address) + offset);
+        }
     }
-  }
 
-  /// @notice Utility function that converts the msg.sender viewed in the L2 to the
-  /// address in the L1 that submitted a tx to the inbox
-  /// @param l2Address L2 address as viewed in msg.sender
-  /// @return l1Address the address in the L1 that triggered the tx to L2
-  function undoL1ToL2Alias(address l2Address) internal pure returns (address l1Address) {
-    unchecked {
-      l1Address = address(uint160(l2Address) - offset);
+    /// @notice Utility function that converts the msg.sender viewed in the L2 to the
+    /// address in the L1 that submitted a tx to the inbox
+    /// @param l2Address L2 address as viewed in msg.sender
+    /// @return l1Address the address in the L1 that triggered the tx to L2
+    function undoL1ToL2Alias(address l2Address) internal pure returns (address l1Address) {
+        unchecked {
+            l1Address = address(uint160(l2Address) - offset);
+        }
     }
-  }
 }

contracts/src/libraries/common/AppendOnlyMerkleTree.sol

@@ -3,69 +3,69 @@
 pragma solidity ^0.8.0;
 
 abstract contract AppendOnlyMerkleTree {
-  /// @dev The maximum height of the withdraw merkle tree.
-  uint256 private constant MAX_TREE_HEIGHT = 40;
+    /// @dev The maximum height of the withdraw merkle tree.
+    uint256 private constant MAX_TREE_HEIGHT = 40;
 
-  /// @notice The merkle root of the current merkle tree.
-  /// @dev This is actual equal to `branches[n]`.
-  bytes32 public messageRoot;
+    /// @notice The merkle root of the current merkle tree.
+    /// @dev This is actual equal to `branches[n]`.
+    bytes32 public messageRoot;
 
-  /// @notice The next unused message index.
-  uint256 public nextMessageIndex;
+    /// @notice The next unused message index.
+    uint256 public nextMessageIndex;
 
-  /// @notice The list of zero hash in each height.
-  bytes32[MAX_TREE_HEIGHT] private zeroHashes;
+    /// @notice The list of zero hash in each height.
+    bytes32[MAX_TREE_HEIGHT] private zeroHashes;
 
-  /// @notice The list of minimum merkle proofs needed to compute next root.
-  /// @dev Only first `n` elements are used, where `n` is the minimum value that `2^{n-1} >= currentMaxNonce + 1`.
-  /// It means we only use `currentMaxNonce + 1` leaf nodes to construct the merkle tree.
-  bytes32[MAX_TREE_HEIGHT] public branches;
+    /// @notice The list of minimum merkle proofs needed to compute next root.
+    /// @dev Only first `n` elements are used, where `n` is the minimum value that `2^{n-1} >= currentMaxNonce + 1`.
+    /// It means we only use `currentMaxNonce + 1` leaf nodes to construct the merkle tree.
+    bytes32[MAX_TREE_HEIGHT] public branches;
 
-  function _initializeMerkleTree() internal {
-    // Compute hashes in empty sparse Merkle tree
-    for (uint256 height = 0; height + 1 < MAX_TREE_HEIGHT; height++) {
-      zeroHashes[height + 1] = _efficientHash(zeroHashes[height], zeroHashes[height]);
+    function _initializeMerkleTree() internal {
+        // Compute hashes in empty sparse Merkle tree
+        for (uint256 height = 0; height + 1 < MAX_TREE_HEIGHT; height++) {
+            zeroHashes[height + 1] = _efficientHash(zeroHashes[height], zeroHashes[height]);
+        }
     }
-  }
 
-  function _appendMessageHash(bytes32 _messageHash) internal returns (uint256, bytes32) {
-    uint256 _currentMessageIndex = nextMessageIndex;
-    bytes32 _hash = _messageHash;
-    uint256 _height = 0;
-    // @todo it can be optimized, since we only need the newly added branch.
-    while (_currentMessageIndex != 0) {
-      if (_currentMessageIndex % 2 == 0) {
-        // it may be used in next round.
+    function _appendMessageHash(bytes32 _messageHash) internal returns (uint256, bytes32) {
+        uint256 _currentMessageIndex = nextMessageIndex;
+        bytes32 _hash = _messageHash;
+        uint256 _height = 0;
+        // @todo it can be optimized, since we only need the newly added branch.
+        while (_currentMessageIndex != 0) {
+            if (_currentMessageIndex % 2 == 0) {
+                // it may be used in next round.
+                branches[_height] = _hash;
+                // it's a left child, the right child must be null
+                _hash = _efficientHash(_hash, zeroHashes[_height]);
+            } else {
+                // it's a right child, use previously computed hash
+                _hash = _efficientHash(branches[_height], _hash);
+            }
+            unchecked {
+                _height += 1;
+            }
+            _currentMessageIndex >>= 1;
+        }
+
         branches[_height] = _hash;
-        // it's a left child, the right child must be null
-        _hash = _efficientHash(_hash, zeroHashes[_height]);
-      } else {
-        // it's a right child, use previously computed hash
-        _hash = _efficientHash(branches[_height], _hash);
-      }
-      unchecked {
-        _height += 1;
-      }
-      _currentMessageIndex >>= 1;
+        messageRoot = _hash;
+
+        _currentMessageIndex = nextMessageIndex;
+        unchecked {
+            nextMessageIndex = _currentMessageIndex + 1;
+        }
+
+        return (_currentMessageIndex, _hash);
     }
 
-    branches[_height] = _hash;
-    messageRoot = _hash;
-
-    _currentMessageIndex = nextMessageIndex;
-    unchecked {
-      nextMessageIndex = _currentMessageIndex + 1;
+    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            mstore(0x00, a)
+            mstore(0x20, b)
+            value := keccak256(0x00, 0x40)
+        }
     }
-
-    return (_currentMessageIndex, _hash);
-  }
-
-  function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      mstore(0x00, a)
-      mstore(0x20, b)
-      value := keccak256(0x00, 0x40)
-    }
-  }
 }

contracts/src/libraries/common/IWhitelist.sol

@@ -3,7 +3,7 @@
 pragma solidity ^0.8.0;
 
 interface IWhitelist {
-  /// @notice Check whether the sender is allowed to do something.
-  /// @param _sender The address of sender.
-  function isSenderAllowed(address _sender) external view returns (bool);
+    /// @notice Check whether the sender is allowed to do something.
+    /// @param _sender The address of sender.
+    function isSenderAllowed(address _sender) external view returns (bool);
 }

contracts/src/libraries/common/OwnableBase.sol

@@ -3,61 +3,61 @@
 pragma solidity ^0.8.0;
 
 abstract contract OwnableBase {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when owner is changed by current owner.
-  /// @param _oldOwner The address of previous owner.
-  /// @param _newOwner The address of new owner.
-  event OwnershipTransferred(address indexed _oldOwner, address indexed _newOwner);
+    /// @notice Emitted when owner is changed by current owner.
+    /// @param _oldOwner The address of previous owner.
+    /// @param _newOwner The address of new owner.
+    event OwnershipTransferred(address indexed _oldOwner, address indexed _newOwner);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @notice The address of the current owner.
-  address public owner;
+    /// @notice The address of the current owner.
+    address public owner;
 
-  /**********************
-   * Function Modifiers *
-   **********************/
+    /**********************
+     * Function Modifiers *
+     **********************/
 
-  /// @dev Throws if called by any account other than the owner.
-  modifier onlyOwner() {
-    require(owner == msg.sender, "caller is not the owner");
-    _;
-  }
+    /// @dev Throws if called by any account other than the owner.
+    modifier onlyOwner() {
+        require(owner == msg.sender, "caller is not the owner");
+        _;
+    }
 
-  /************************
-   * Restricted Functions *
-   ************************/
+    /************************
+     * Restricted Functions *
+     ************************/
 
-  /// @notice Leaves the contract without owner. It will not be possible to call
-  /// `onlyOwner` functions anymore. Can only be called by the current owner.
-  ///
-  /// @dev Renouncing ownership will leave the contract without an owner,
-  /// thereby removing any functionality that is only available to the owner.
-  function renounceOwnership() public onlyOwner {
-    _transferOwnership(address(0));
-  }
+    /// @notice Leaves the contract without owner. It will not be possible to call
+    /// `onlyOwner` functions anymore. Can only be called by the current owner.
+    ///
+    /// @dev Renouncing ownership will leave the contract without an owner,
+    /// thereby removing any functionality that is only available to the owner.
+    function renounceOwnership() public onlyOwner {
+        _transferOwnership(address(0));
+    }
 
-  /// @notice Transfers ownership of the contract to a new account (`newOwner`).
-  /// Can only be called by the current owner.
-  function transferOwnership(address _newOwner) public onlyOwner {
-    require(_newOwner != address(0), "new owner is the zero address");
-    _transferOwnership(_newOwner);
-  }
+    /// @notice Transfers ownership of the contract to a new account (`newOwner`).
+    /// Can only be called by the current owner.
+    function transferOwnership(address _newOwner) public onlyOwner {
+        require(_newOwner != address(0), "new owner is the zero address");
+        _transferOwnership(_newOwner);
+    }
 
-  /**********************
-   * Internal Functions *
-   **********************/
+    /**********************
+     * Internal Functions *
+     **********************/
 
-  /// @dev Transfers ownership of the contract to a new account (`newOwner`).
-  /// Internal function without access restriction.
-  function _transferOwnership(address _newOwner) internal {
-    address _oldOwner = owner;
-    owner = _newOwner;
-    emit OwnershipTransferred(_oldOwner, _newOwner);
-  }
+    /// @dev Transfers ownership of the contract to a new account (`newOwner`).
+    /// Internal function without access restriction.
+    function _transferOwnership(address _newOwner) internal {
+        address _oldOwner = owner;
+        owner = _newOwner;
+        emit OwnershipTransferred(_oldOwner, _newOwner);
+    }
 }

contracts/src/libraries/constants/ScrollConstants.sol

@@ -3,6 +3,6 @@
 pragma solidity ^0.8.0;
 
 library ScrollConstants {
-  /// @notice The address of default cross chain message sender.
-  address internal constant DEFAULT_XDOMAIN_MESSAGE_SENDER = address(1);
+    /// @notice The address of default cross chain message sender.
+    address internal constant DEFAULT_XDOMAIN_MESSAGE_SENDER = address(1);
 }

contracts/src/libraries/constants/ScrollPredeploy.sol

@@ -3,9 +3,9 @@
 pragma solidity ^0.8.0;
 
 library ScrollPredeploy {
-  address internal constant L1_MESSAGE_QUEUE = 0x5300000000000000000000000000000000000000;
+    address internal constant L1_MESSAGE_QUEUE = 0x5300000000000000000000000000000000000000;
 
-  address internal constant L1_BLOCK_CONTAINER = 0x5300000000000000000000000000000000000001;
+    address internal constant L1_BLOCK_CONTAINER = 0x5300000000000000000000000000000000000001;
 
-  address internal constant L1_GAS_PRICE_ORACLE = 0x5300000000000000000000000000000000000002;
-}
+    address internal constant L1_GAS_PRICE_ORACLE = 0x5300000000000000000000000000000000000002;
+}

contracts/src/libraries/gateway/IScrollGateway.sol

@@ -3,12 +3,12 @@
 pragma solidity ^0.8.0;
 
 interface IScrollGateway {
-  /// @notice The address of corresponding L1/L2 Gateway contract.
-  function counterpart() external view returns (address);
+    /// @notice The address of corresponding L1/L2 Gateway contract.
+    function counterpart() external view returns (address);
 
-  /// @notice The address of L1GatewayRouter/L2GatewayRouter contract.
-  function router() external view returns (address);
+    /// @notice The address of L1GatewayRouter/L2GatewayRouter contract.
+    function router() external view returns (address);
 
-  /// @notice The address of corresponding L1ScrollMessenger/L2ScrollMessenger contract.
-  function messenger() external view returns (address);
+    /// @notice The address of corresponding L1ScrollMessenger/L2ScrollMessenger contract.
+    function messenger() external view returns (address);
 }

contracts/src/libraries/gateway/ScrollGatewayBase.sol

@@ -2,85 +2,85 @@
 
 pragma solidity ^0.8.0;
 
-import { IScrollGateway } from "./IScrollGateway.sol";
-import { IScrollMessenger } from "../IScrollMessenger.sol";
+import {IScrollGateway} from "./IScrollGateway.sol";
+import {IScrollMessenger} from "../IScrollMessenger.sol";
 
 abstract contract ScrollGatewayBase is IScrollGateway {
-  /*************
-   * Constants *
-   *************/
+    /*************
+     * Constants *
+     *************/
 
-  // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.5.0/contracts/security/ReentrancyGuard.sol
-  uint256 private constant _NOT_ENTERED = 1;
-  uint256 private constant _ENTERED = 2;
+    // https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v4.5.0/contracts/security/ReentrancyGuard.sol
+    uint256 private constant _NOT_ENTERED = 1;
+    uint256 private constant _ENTERED = 2;
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  /// @inheritdoc IScrollGateway
-  address public override counterpart;
+    /// @inheritdoc IScrollGateway
+    address public override counterpart;
 
-  /// @inheritdoc IScrollGateway
-  address public override router;
+    /// @inheritdoc IScrollGateway
+    address public override router;
 
-  /// @inheritdoc IScrollGateway
-  address public override messenger;
+    /// @inheritdoc IScrollGateway
+    address public override messenger;
 
-  /// @dev The status of for non-reentrant check.
-  uint256 private _status;
+    /// @dev The status of for non-reentrant check.
+    uint256 private _status;
 
-  /**********************
-   * Function Modifiers *
-   **********************/
+    /**********************
+     * Function Modifiers *
+     **********************/
 
-  modifier nonReentrant() {
-    // On the first call to nonReentrant, _notEntered will be true
-    require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
+    modifier nonReentrant() {
+        // On the first call to nonReentrant, _notEntered will be true
+        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");
 
-    // Any calls to nonReentrant after this point will fail
-    _status = _ENTERED;
+        // Any calls to nonReentrant after this point will fail
+        _status = _ENTERED;
 
-    _;
+        _;
 
-    // By storing the original value once again, a refund is triggered (see
-    // https://eips.ethereum.org/EIPS/eip-2200)
-    _status = _NOT_ENTERED;
-  }
-
-  modifier onlyMessenger() {
-    require(msg.sender == messenger, "only messenger can call");
-    _;
-  }
-
-  modifier onlyCallByCounterpart() {
-    address _messenger = messenger; // gas saving
-    require(msg.sender == _messenger, "only messenger can call");
-    require(counterpart == IScrollMessenger(_messenger).xDomainMessageSender(), "only call by conterpart");
-    _;
-  }
-
-  /***************
-   * Constructor *
-   ***************/
-
-  function _initialize(
-    address _counterpart,
-    address _router,
-    address _messenger
-  ) internal {
-    require(_counterpart != address(0), "zero counterpart address");
-    require(_messenger != address(0), "zero messenger address");
-
-    counterpart = _counterpart;
-    messenger = _messenger;
-
-    // @note: the address of router could be zero, if this contract is GatewayRouter.
-    if (_router != address(0)) {
-      router = _router;
+        // By storing the original value once again, a refund is triggered (see
+        // https://eips.ethereum.org/EIPS/eip-2200)
+        _status = _NOT_ENTERED;
     }
 
-    // for reentrancy guard
-    _status = _NOT_ENTERED;
-  }
+    modifier onlyMessenger() {
+        require(msg.sender == messenger, "only messenger can call");
+        _;
+    }
+
+    modifier onlyCallByCounterpart() {
+        address _messenger = messenger; // gas saving
+        require(msg.sender == _messenger, "only messenger can call");
+        require(counterpart == IScrollMessenger(_messenger).xDomainMessageSender(), "only call by conterpart");
+        _;
+    }
+
+    /***************
+     * Constructor *
+     ***************/
+
+    function _initialize(
+        address _counterpart,
+        address _router,
+        address _messenger
+    ) internal {
+        require(_counterpart != address(0), "zero counterpart address");
+        require(_messenger != address(0), "zero messenger address");
+
+        counterpart = _counterpart;
+        messenger = _messenger;
+
+        // @note: the address of router could be zero, if this contract is GatewayRouter.
+        if (_router != address(0)) {
+            router = _router;
+        }
+
+        // for reentrancy guard
+        _status = _NOT_ENTERED;
+    }
 }

contracts/src/libraries/oracle/IGasOracle.sol

@@ -3,14 +3,14 @@
 pragma solidity ^0.8.0;
 
 interface IGasOracle {
-  /// @notice Estimate fee for cross chain message call.
-  /// @param _sender The address of sender who invoke the call.
-  /// @param _to The target address to receive the call.
-  /// @param _message The message will be passed to the target address.
-  function estimateMessageFee(
-    address _sender,
-    address _to,
-    bytes memory _message,
-    uint256 _gasLimit
-  ) external view returns (uint256);
+    /// @notice Estimate fee for cross chain message call.
+    /// @param _sender The address of sender who invoke the call.
+    /// @param _to The target address to receive the call.
+    /// @param _message The message will be passed to the target address.
+    function estimateMessageFee(
+        address _sender,
+        address _to,
+        bytes memory _message,
+        uint256 _gasLimit
+    ) external view returns (uint256);
 }

contracts/src/libraries/oracle/SimpleGasOracle.sol

@@ -2,101 +2,101 @@
 
 pragma solidity ^0.8.0;
 
-import { OwnableUpgradeable } from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
 
 import "./IGasOracle.sol";
 
 /// @title Simple Gas Oracle
 contract SimpleGasOracle is OwnableUpgradeable, IGasOracle {
-  /**********
-   * Events *
-   **********/
+    /**********
+     * Events *
+     **********/
 
-  /// @notice Emitted when owner update default FeeConfig.
-  /// @param _baseFees The amount base fee to pay.
-  /// @param _feesPerByte The amount fee to pay per message byte.
-  event UpdateDefaultFeeConfig(uint256 _baseFees, uint256 _feesPerByte);
+    /// @notice Emitted when owner update default FeeConfig.
+    /// @param _baseFees The amount base fee to pay.
+    /// @param _feesPerByte The amount fee to pay per message byte.
+    event UpdateDefaultFeeConfig(uint256 _baseFees, uint256 _feesPerByte);
 
-  /// @notice Emitted when owner update custom FeeConfig.
-  /// @param _sender The address of custom message sender.
-  /// @param _baseFees The amount base fee to pay.
-  /// @param _feesPerByte The amount fee to pay per message byte.
-  event UpdateCustomFeeConfig(address indexed _sender, uint256 _baseFees, uint256 _feesPerByte);
+    /// @notice Emitted when owner update custom FeeConfig.
+    /// @param _sender The address of custom message sender.
+    /// @param _baseFees The amount base fee to pay.
+    /// @param _feesPerByte The amount fee to pay per message byte.
+    event UpdateCustomFeeConfig(address indexed _sender, uint256 _baseFees, uint256 _feesPerByte);
 
-  /*************
-   * Variables *
-   *************/
+    /*************
+     * Variables *
+     *************/
 
-  struct FeeConfig {
-    uint128 baseFees;
-    uint128 feesPerByte;
-  }
-
-  /// @notice The default cross chain message FeeConfig.
-  FeeConfig public defaultFeeConfig;
-
-  /// @notice Mapping from sender address to custom FeeConfig.
-  mapping(address => FeeConfig) public customFeeConfig;
-
-  /// @notice Whether the sender should user custom FeeConfig.
-  mapping(address => bool) public hasCustomConfig;
-
-  /***************
-   * Constructor *
-   ***************/
-
-  function initialize() external initializer {
-    OwnableUpgradeable.__Ownable_init();
-  }
-
-  /*************************
-   * Public View Functions *
-   *************************/
-
-  /// @inheritdoc IGasOracle
-  function estimateMessageFee(
-    address _sender,
-    address,
-    bytes memory _message,
-    uint256
-  ) external view override returns (uint256) {
-    FeeConfig memory _feeConfig;
-    if (hasCustomConfig[_sender]) {
-      _feeConfig = customFeeConfig[_sender];
-    } else {
-      _feeConfig = defaultFeeConfig;
+    struct FeeConfig {
+        uint128 baseFees;
+        uint128 feesPerByte;
     }
 
-    unchecked {
-      return _feeConfig.baseFees + uint256(_feeConfig.feesPerByte) * _message.length;
+    /// @notice The default cross chain message FeeConfig.
+    FeeConfig public defaultFeeConfig;
+
+    /// @notice Mapping from sender address to custom FeeConfig.
+    mapping(address => FeeConfig) public customFeeConfig;
+
+    /// @notice Whether the sender should user custom FeeConfig.
+    mapping(address => bool) public hasCustomConfig;
+
+    /***************
+     * Constructor *
+     ***************/
+
+    function initialize() external initializer {
+        OwnableUpgradeable.__Ownable_init();
     }
-  }
 
-  /************************
-   * Restricted Functions *
-   ************************/
+    /*************************
+     * Public View Functions *
+     *************************/
 
-  /// @notice Update default fee config.
-  /// @param _baseFees The amount of baseFees to update.
-  /// @param _feesPerByte The amount of fees per byte to update.
-  function updateDefaultFeeConfig(uint128 _baseFees, uint128 _feesPerByte) external onlyOwner {
-    defaultFeeConfig = FeeConfig(_baseFees, _feesPerByte);
+    /// @inheritdoc IGasOracle
+    function estimateMessageFee(
+        address _sender,
+        address,
+        bytes memory _message,
+        uint256
+    ) external view override returns (uint256) {
+        FeeConfig memory _feeConfig;
+        if (hasCustomConfig[_sender]) {
+            _feeConfig = customFeeConfig[_sender];
+        } else {
+            _feeConfig = defaultFeeConfig;
+        }
 
-    emit UpdateDefaultFeeConfig(_baseFees, _feesPerByte);
-  }
+        unchecked {
+            return _feeConfig.baseFees + uint256(_feeConfig.feesPerByte) * _message.length;
+        }
+    }
 
-  /// @notice Update custom fee config for sender.
-  /// @param _sender The address of sender to update custom FeeConfig.
-  /// @param _baseFees The amount of baseFees to update.
-  /// @param _feesPerByte The amount of fees per byte to update.
-  function updateCustomFeeConfig(
-    address _sender,
-    uint128 _baseFees,
-    uint128 _feesPerByte
-  ) external onlyOwner {
-    customFeeConfig[_sender] = FeeConfig(_baseFees, _feesPerByte);
-    hasCustomConfig[_sender] = true;
+    /************************
+     * Restricted Functions *
+     ************************/
 
-    emit UpdateCustomFeeConfig(_sender, _baseFees, _feesPerByte);
-  }
+    /// @notice Update default fee config.
+    /// @param _baseFees The amount of baseFees to update.
+    /// @param _feesPerByte The amount of fees per byte to update.
+    function updateDefaultFeeConfig(uint128 _baseFees, uint128 _feesPerByte) external onlyOwner {
+        defaultFeeConfig = FeeConfig(_baseFees, _feesPerByte);
+
+        emit UpdateDefaultFeeConfig(_baseFees, _feesPerByte);
+    }
+
+    /// @notice Update custom fee config for sender.
+    /// @param _sender The address of sender to update custom FeeConfig.
+    /// @param _baseFees The amount of baseFees to update.
+    /// @param _feesPerByte The amount of fees per byte to update.
+    function updateCustomFeeConfig(
+        address _sender,
+        uint128 _baseFees,
+        uint128 _feesPerByte
+    ) external onlyOwner {
+        customFeeConfig[_sender] = FeeConfig(_baseFees, _feesPerByte);
+        hasCustomConfig[_sender] = true;
+
+        emit UpdateCustomFeeConfig(_sender, _baseFees, _feesPerByte);
+    }
 }

contracts/src/libraries/token/IERC677Receiver.sol

@@ -3,9 +3,9 @@
 pragma solidity ^0.8.0;
 
 interface IERC677Receiver {
-  function onTokenTransfer(
-    address sender,
-    uint256 value,
-    bytes memory data
-  ) external;
+    function onTokenTransfer(
+        address sender,
+        uint256 value,
+        bytes memory data
+    ) external;
 }

contracts/src/libraries/token/IScrollERC1155.sol

@@ -2,60 +2,60 @@
 
 pragma solidity ^0.8.0;
 
-import { IERC1155 } from "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
+import {IERC1155} from "@openzeppelin/contracts/token/ERC1155/IERC1155.sol";
 
 interface IScrollERC1155 is IERC1155 {
-  /// @notice Return the address of Gateway the token belongs to.
-  function gateway() external view returns (address);
+    /// @notice Return the address of Gateway the token belongs to.
+    function gateway() external view returns (address);
 
-  /// @notice Return the address of counterpart token.
-  function counterpart() external view returns (address);
+    /// @notice Return the address of counterpart token.
+    function counterpart() external view returns (address);
 
-  /// @notice Mint some token to recipient's account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _to The address of recipient.
-  /// @param _tokenId The token id to mint.
-  /// @param _amount The amount of token to mint.
-  /// @param _data The data passed to recipient
-  function mint(
-    address _to,
-    uint256 _tokenId,
-    uint256 _amount,
-    bytes memory _data
-  ) external;
+    /// @notice Mint some token to recipient's account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _to The address of recipient.
+    /// @param _tokenId The token id to mint.
+    /// @param _amount The amount of token to mint.
+    /// @param _data The data passed to recipient
+    function mint(
+        address _to,
+        uint256 _tokenId,
+        uint256 _amount,
+        bytes memory _data
+    ) external;
 
-  /// @notice Burn some token from account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _from The address of account to burn token.
-  /// @param _tokenId The token id to burn.
-  /// @param _amount The amount of token to burn.
-  function burn(
-    address _from,
-    uint256 _tokenId,
-    uint256 _amount
-  ) external;
+    /// @notice Burn some token from account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _from The address of account to burn token.
+    /// @param _tokenId The token id to burn.
+    /// @param _amount The amount of token to burn.
+    function burn(
+        address _from,
+        uint256 _tokenId,
+        uint256 _amount
+    ) external;
 
-  /// @notice Batch mint some token to recipient's account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _to The address of recipient.
-  /// @param _tokenIds The token id to mint.
-  /// @param _amounts The list of corresponding amount of token to mint.
-  /// @param _data The data passed to recipient
-  function batchMint(
-    address _to,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts,
-    bytes calldata _data
-  ) external;
+    /// @notice Batch mint some token to recipient's account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _to The address of recipient.
+    /// @param _tokenIds The token id to mint.
+    /// @param _amounts The list of corresponding amount of token to mint.
+    /// @param _data The data passed to recipient
+    function batchMint(
+        address _to,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts,
+        bytes calldata _data
+    ) external;
 
-  /// @notice Batch burn some token from account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _from The address of account to burn token.
-  /// @param _tokenIds The list of token ids to burn.
-  /// @param _amounts The list of corresponding amount of token to burn.
-  function batchBurn(
-    address _from,
-    uint256[] calldata _tokenIds,
-    uint256[] calldata _amounts
-  ) external;
+    /// @notice Batch burn some token from account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _from The address of account to burn token.
+    /// @param _tokenIds The list of token ids to burn.
+    /// @param _amounts The list of corresponding amount of token to burn.
+    function batchBurn(
+        address _from,
+        uint256[] calldata _tokenIds,
+        uint256[] calldata _amounts
+    ) external;
 }

contracts/src/libraries/token/IScrollERC721.sol

@@ -2,23 +2,23 @@
 
 pragma solidity ^0.8.0;
 
-import { IERC721 } from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
+import {IERC721} from "@openzeppelin/contracts/token/ERC721/IERC721.sol";
 
 interface IScrollERC721 is IERC721 {
-  /// @notice Return the address of Gateway the token belongs to.
-  function gateway() external view returns (address);
+    /// @notice Return the address of Gateway the token belongs to.
+    function gateway() external view returns (address);
 
-  /// @notice Return the address of counterpart token.
-  function counterpart() external view returns (address);
+    /// @notice Return the address of counterpart token.
+    function counterpart() external view returns (address);
 
-  /// @notice Mint some token to recipient's account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _to The address of recipient.
-  /// @param _tokenId The token id to mint.
-  function mint(address _to, uint256 _tokenId) external;
+    /// @notice Mint some token to recipient's account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _to The address of recipient.
+    /// @param _tokenId The token id to mint.
+    function mint(address _to, uint256 _tokenId) external;
 
-  /// @notice Burn some token from account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _tokenId The token id to burn.
-  function burn(uint256 _tokenId) external;
+    /// @notice Burn some token from account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _tokenId The token id to burn.
+    function burn(uint256 _tokenId) external;
 }

contracts/src/libraries/token/IScrollStandardERC20.sol

@@ -2,37 +2,37 @@
 
 pragma solidity ^0.8.0;
 
-import { IERC20Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
-import { IERC20PermitUpgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-IERC20PermitUpgradeable.sol";
+import {IERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/IERC20Upgradeable.sol";
+import {IERC20PermitUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-IERC20PermitUpgradeable.sol";
 
 // The recommended ERC20 implementation for bridge token.
 // deployed in L2 when original token is on L1
 // deployed in L1 when original token is on L2
 interface IScrollStandardERC20 is IERC20Upgradeable, IERC20PermitUpgradeable {
-  /// @notice Return the address of Gateway the token belongs to.
-  function gateway() external view returns (address);
+    /// @notice Return the address of Gateway the token belongs to.
+    function gateway() external view returns (address);
 
-  /// @notice Return the address of counterpart token.
-  function counterpart() external view returns (address);
+    /// @notice Return the address of counterpart token.
+    function counterpart() external view returns (address);
 
-  /// @dev ERC677 Standard, see https://github.com/ethereum/EIPs/issues/677
-  /// Defi can use this method to transfer L1/L2 token to L2/L1,
-  /// and deposit to L2/L1 contract in one transaction
-  function transferAndCall(
-    address receiver,
-    uint256 amount,
-    bytes calldata data
-  ) external returns (bool success);
+    /// @dev ERC677 Standard, see https://github.com/ethereum/EIPs/issues/677
+    /// Defi can use this method to transfer L1/L2 token to L2/L1,
+    /// and deposit to L2/L1 contract in one transaction
+    function transferAndCall(
+        address receiver,
+        uint256 amount,
+        bytes calldata data
+    ) external returns (bool success);
 
-  /// @notice Mint some token to recipient's account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _to The address of recipient.
-  /// @param _amount The amount of token to mint.
-  function mint(address _to, uint256 _amount) external;
+    /// @notice Mint some token to recipient's account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _to The address of recipient.
+    /// @param _amount The amount of token to mint.
+    function mint(address _to, uint256 _amount) external;
 
-  /// @notice Mint some token from account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _from The address of account to burn token.
-  /// @param _amount The amount of token to mint.
-  function burn(address _from, uint256 _amount) external;
+    /// @notice Mint some token from account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _from The address of account to burn token.
+    /// @param _amount The amount of token to mint.
+    function burn(address _from, uint256 _amount) external;
 }

contracts/src/libraries/token/IScrollStandardERC20Factory.sol

@@ -3,15 +3,15 @@
 pragma solidity ^0.8.0;
 
 interface IScrollStandardERC20Factory {
-  event DeployToken(address indexed _l1Token, address indexed _l2Token);
+    event DeployToken(address indexed _l1Token, address indexed _l2Token);
 
-  /// @notice Compute the corresponding l2 token address given l1 token address.
-  /// @param _gateway The address of gateway contract.
-  /// @param _l1Token The address of l1 token.
-  function computeL2TokenAddress(address _gateway, address _l1Token) external view returns (address);
+    /// @notice Compute the corresponding l2 token address given l1 token address.
+    /// @param _gateway The address of gateway contract.
+    /// @param _l1Token The address of l1 token.
+    function computeL2TokenAddress(address _gateway, address _l1Token) external view returns (address);
 
-  /// @notice Deploy the corresponding l2 token address given l1 token address.
-  /// @param _gateway The address of gateway contract.
-  /// @param _l1Token The address of l1 token.
-  function deployL2Token(address _gateway, address _l1Token) external returns (address);
+    /// @notice Deploy the corresponding l2 token address given l1 token address.
+    /// @param _gateway The address of gateway contract.
+    /// @param _l1Token The address of l1 token.
+    function deployL2Token(address _gateway, address _l1Token) external returns (address);
 }

contracts/src/libraries/token/ScrollStandardERC20.sol

@@ -2,90 +2,90 @@
 
 pragma solidity ^0.8.0;
 
-import { ERC20Upgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
-import { ERC20PermitUpgradeable } from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-ERC20PermitUpgradeable.sol";
-import { IScrollStandardERC20 } from "./IScrollStandardERC20.sol";
-import { IERC677Receiver } from "./IERC677Receiver.sol";
+import {ERC20Upgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";
+import {ERC20PermitUpgradeable} from "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/draft-ERC20PermitUpgradeable.sol";
+import {IScrollStandardERC20} from "./IScrollStandardERC20.sol";
+import {IERC677Receiver} from "./IERC677Receiver.sol";
 
 contract ScrollStandardERC20 is ERC20PermitUpgradeable, IScrollStandardERC20 {
-  /// @inheritdoc IScrollStandardERC20
-  address public override gateway;
+    /// @inheritdoc IScrollStandardERC20
+    address public override gateway;
 
-  /// @inheritdoc IScrollStandardERC20
-  address public override counterpart;
+    /// @inheritdoc IScrollStandardERC20
+    address public override counterpart;
 
-  uint8 private decimals_;
+    uint8 private decimals_;
 
-  modifier onlyGateway() {
-    require(gateway == msg.sender, "Only Gateway");
-    _;
-  }
-
-  function initialize(
-    string memory _name,
-    string memory _symbol,
-    uint8 _decimals,
-    address _gateway,
-    address _counterpart
-  ) external initializer {
-    __ERC20Permit_init(_name);
-    __ERC20_init(_name, _symbol);
-
-    decimals_ = _decimals;
-    gateway = _gateway;
-    counterpart = _counterpart;
-  }
-
-  function decimals() public view override returns (uint8) {
-    return decimals_;
-  }
-
-  /// @dev ERC677 Standard, see https://github.com/ethereum/EIPs/issues/677
-  /// Defi can use this method to transfer L1/L2 token to L2/L1,
-  /// and deposit to L2/L1 contract in one transaction
-  function transferAndCall(
-    address receiver,
-    uint256 amount,
-    bytes calldata data
-  ) external returns (bool success) {
-    ERC20Upgradeable.transfer(receiver, amount);
-    if (isContract(receiver)) {
-      contractFallback(receiver, amount, data);
+    modifier onlyGateway() {
+        require(gateway == msg.sender, "Only Gateway");
+        _;
     }
-    return true;
-  }
 
-  function contractFallback(
-    address to,
-    uint256 value,
-    bytes memory data
-  ) private {
-    IERC677Receiver receiver = IERC677Receiver(to);
-    receiver.onTokenTransfer(msg.sender, value, data);
-  }
+    function initialize(
+        string memory _name,
+        string memory _symbol,
+        uint8 _decimals,
+        address _gateway,
+        address _counterpart
+    ) external initializer {
+        __ERC20Permit_init(_name);
+        __ERC20_init(_name, _symbol);
 
-  function isContract(address _addr) private view returns (bool hasCode) {
-    uint256 length;
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      length := extcodesize(_addr)
+        decimals_ = _decimals;
+        gateway = _gateway;
+        counterpart = _counterpart;
     }
-    return length > 0;
-  }
 
-  /// @notice Mint some token to recipient's account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _to The address of recipient.
-  /// @param _amount The amount of token to mint.
-  function mint(address _to, uint256 _amount) external onlyGateway {
-    _mint(_to, _amount);
-  }
+    function decimals() public view override returns (uint8) {
+        return decimals_;
+    }
 
-  /// @notice Mint some token from account.
-  /// @dev Gateway Utilities, only gateway contract can call
-  /// @param _from The address of account to burn token.
-  /// @param _amount The amount of token to mint.
-  function burn(address _from, uint256 _amount) external onlyGateway {
-    _burn(_from, _amount);
-  }
+    /// @dev ERC677 Standard, see https://github.com/ethereum/EIPs/issues/677
+    /// Defi can use this method to transfer L1/L2 token to L2/L1,
+    /// and deposit to L2/L1 contract in one transaction
+    function transferAndCall(
+        address receiver,
+        uint256 amount,
+        bytes calldata data
+    ) external returns (bool success) {
+        ERC20Upgradeable.transfer(receiver, amount);
+        if (isContract(receiver)) {
+            contractFallback(receiver, amount, data);
+        }
+        return true;
+    }
+
+    function contractFallback(
+        address to,
+        uint256 value,
+        bytes memory data
+    ) private {
+        IERC677Receiver receiver = IERC677Receiver(to);
+        receiver.onTokenTransfer(msg.sender, value, data);
+    }
+
+    function isContract(address _addr) private view returns (bool hasCode) {
+        uint256 length;
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            length := extcodesize(_addr)
+        }
+        return length > 0;
+    }
+
+    /// @notice Mint some token to recipient's account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _to The address of recipient.
+    /// @param _amount The amount of token to mint.
+    function mint(address _to, uint256 _amount) external onlyGateway {
+        _mint(_to, _amount);
+    }
+
+    /// @notice Mint some token from account.
+    /// @dev Gateway Utilities, only gateway contract can call
+    /// @param _from The address of account to burn token.
+    /// @param _amount The amount of token to mint.
+    function burn(address _from, uint256 _amount) external onlyGateway {
+        _burn(_from, _amount);
+    }
 }

contracts/src/libraries/token/ScrollStandardERC20Factory.sol

@@ -2,43 +2,43 @@
 
 pragma solidity ^0.8.0;
 
-import { Clones } from "@openzeppelin/contracts/proxy/Clones.sol";
-import { Ownable } from "@openzeppelin/contracts/access/Ownable.sol";
+import {Clones} from "@openzeppelin/contracts/proxy/Clones.sol";
+import {Ownable} from "@openzeppelin/contracts/access/Ownable.sol";
 
-import { IScrollStandardERC20Factory } from "./IScrollStandardERC20Factory.sol";
+import {IScrollStandardERC20Factory} from "./IScrollStandardERC20Factory.sol";
 
 /// @title ScrollStandardERC20Factory
 /// @notice The `ScrollStandardERC20Factory` is used to deploy `ScrollStandardERC20` for `L2StandardERC20Gateway`.
 /// It uses the `Clones` contract to deploy contract with minimum gas usage.
 /// @dev The implementation of deployed token is non-upgradable. This design may be changed in the future.
 contract ScrollStandardERC20Factory is Ownable, IScrollStandardERC20Factory {
-  /// @notice The address of `ScrollStandardERC20` implementation.
-  address public implementation;
+    /// @notice The address of `ScrollStandardERC20` implementation.
+    address public implementation;
 
-  constructor(address _implementation) {
-    require(_implementation != address(0), "zero implementation address");
+    constructor(address _implementation) {
+        require(_implementation != address(0), "zero implementation address");
 
-    implementation = _implementation;
-  }
+        implementation = _implementation;
+    }
 
-  /// @inheritdoc IScrollStandardERC20Factory
-  function computeL2TokenAddress(address _gateway, address _l1Token) external view returns (address) {
-    // In StandardERC20Gateway, all corresponding l2 tokens are depoyed by Create2 with salt,
-    // we can calculate the l2 address directly.
-    bytes32 _salt = _getSalt(_gateway, _l1Token);
+    /// @inheritdoc IScrollStandardERC20Factory
+    function computeL2TokenAddress(address _gateway, address _l1Token) external view returns (address) {
+        // In StandardERC20Gateway, all corresponding l2 tokens are depoyed by Create2 with salt,
+        // we can calculate the l2 address directly.
+        bytes32 _salt = _getSalt(_gateway, _l1Token);
 
-    return Clones.predictDeterministicAddress(implementation, _salt);
-  }
+        return Clones.predictDeterministicAddress(implementation, _salt);
+    }
 
-  /// @inheritdoc IScrollStandardERC20Factory
-  /// @dev This function should only be called by owner to avoid DDoS attack on StandardTokenBridge.
-  function deployL2Token(address _gateway, address _l1Token) external onlyOwner returns (address) {
-    bytes32 _salt = _getSalt(_gateway, _l1Token);
+    /// @inheritdoc IScrollStandardERC20Factory
+    /// @dev This function should only be called by owner to avoid DDoS attack on StandardTokenBridge.
+    function deployL2Token(address _gateway, address _l1Token) external onlyOwner returns (address) {
+        bytes32 _salt = _getSalt(_gateway, _l1Token);
 
-    return Clones.cloneDeterministic(implementation, _salt);
-  }
+        return Clones.cloneDeterministic(implementation, _salt);
+    }
 
-  function _getSalt(address _gateway, address _l1Token) internal pure returns (bytes32) {
-    return keccak256(abi.encodePacked(_gateway, keccak256(abi.encodePacked(_l1Token))));
-  }
+    function _getSalt(address _gateway, address _l1Token) internal pure returns (bytes32) {
+        return keccak256(abi.encodePacked(_gateway, keccak256(abi.encodePacked(_l1Token))));
+    }
 }

contracts/src/libraries/verifier/PatriciaMerkleTrieVerifier.sol

@@ -3,485 +3,498 @@
 pragma solidity ^0.8.0;
 
 library PatriciaMerkleTrieVerifier {
-  /// @notice Internal function to validates a proof from eth_getProof.
-  /// @param account The address of the contract.
-  /// @param storageKey The storage slot to verify.
-  /// @param proof The rlp encoding result of eth_getProof.
-  /// @return stateRoot The computed state root. Must be checked by the caller.
-  /// @return storageValue The value of `storageKey`.
-  ///
-  /// @dev The code is based on
-  /// 1. https://eips.ethereum.org/EIPS/eip-1186
-  /// 2. https://ethereum.org/en/developers/docs/data-structures-and-encoding/rlp/
-  /// 3. https://github.com/ethereum/go-ethereum/blob/master/trie/proof.go#L114
-  /// 4. https://github.com/privacy-scaling-explorations/zkevm-chain/blob/master/contracts/templates/PatriciaValidator.sol
-  ///
-  /// The encoding order of `proof` is
-  /// ```text
-  /// |        1 byte        |      ...      |        1 byte        |      ...      |
-  /// | account proof length | account proof | storage proof length | storage proof |
-  /// ```
-  function verifyPatriciaProof(
-    address account,
-    bytes32 storageKey,
-    bytes calldata proof
-  ) internal pure returns (bytes32 stateRoot, bytes32 storageValue) {
-    assembly {
-      // hashes 32 bytes of `v`
-      function keccak_32(v) -> r {
-        mstore(0x00, v)
-        r := keccak256(0x00, 0x20)
-      }
-      // hashes the last 20 bytes of `v`
-      function keccak_20(v) -> r {
-        mstore(0x00, v)
-        r := keccak256(0x0c, 0x14)
-      }
-      // reverts with error `msg`.
-      // make sure the length of error string <= 32
-      function revertWith(msg) {
-        // keccak("Error(string)")
-        mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
-        mstore(0x04, 0x20) // str.offset
-        mstore(0x44, msg)
-        let msgLen
-        for {} msg {} {
-          msg := shl(8, msg)
-          msgLen := add(msgLen, 1)
+    /// @notice Internal function to validates a proof from eth_getProof.
+    /// @param account The address of the contract.
+    /// @param storageKey The storage slot to verify.
+    /// @param proof The rlp encoding result of eth_getProof.
+    /// @return stateRoot The computed state root. Must be checked by the caller.
+    /// @return storageValue The value of `storageKey`.
+    ///
+    /// @dev The code is based on
+    /// 1. https://eips.ethereum.org/EIPS/eip-1186
+    /// 2. https://ethereum.org/en/developers/docs/data-structures-and-encoding/rlp/
+    /// 3. https://github.com/ethereum/go-ethereum/blob/master/trie/proof.go#L114
+    /// 4. https://github.com/privacy-scaling-explorations/zkevm-chain/blob/master/contracts/templates/PatriciaValidator.sol
+    ///
+    /// The encoding order of `proof` is
+    /// ```text
+    /// |        1 byte        |      ...      |        1 byte        |      ...      |
+    /// | account proof length | account proof | storage proof length | storage proof |
+    /// ```
+    function verifyPatriciaProof(
+        address account,
+        bytes32 storageKey,
+        bytes calldata proof
+    ) internal pure returns (bytes32 stateRoot, bytes32 storageValue) {
+        assembly {
+            // hashes 32 bytes of `v`
+            function keccak_32(v) -> r {
+                mstore(0x00, v)
+                r := keccak256(0x00, 0x20)
+            }
+            // hashes the last 20 bytes of `v`
+            function keccak_20(v) -> r {
+                mstore(0x00, v)
+                r := keccak256(0x0c, 0x14)
+            }
+            // reverts with error `msg`.
+            // make sure the length of error string <= 32
+            function revertWith(msg) {
+                // keccak("Error(string)")
+                mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
+                mstore(0x04, 0x20) // str.offset
+                mstore(0x44, msg)
+                let msgLen
+                for {
+
+                } msg {
+
+                } {
+                    msg := shl(8, msg)
+                    msgLen := add(msgLen, 1)
+                }
+                mstore(0x24, msgLen) // str.length
+                revert(0x00, 0x64)
+            }
+            // reverts with `msg` when condition is not matched.
+            // make sure the length of error string <= 32
+            function require(cond, msg) {
+                if iszero(cond) {
+                    revertWith(msg)
+                }
+            }
+
+            // special function for decoding the storage value
+            // because of the prefix truncation if value > 31 bytes
+            // see `loadValue`
+            function decodeItem(word, len) -> ret {
+                // default
+                ret := word
+
+                // RLP single byte
+                if lt(word, 0x80) {
+                    leave
+                }
+
+                // truncated
+                if gt(len, 32) {
+                    leave
+                }
+
+                // value is >= 0x80 and <= 32 bytes.
+                // `len` should be at least 2 (prefix byte + value)
+                // otherwise the RLP is malformed.
+                let bits := mul(len, 8)
+                // sub 8 bits - the prefix
+                bits := sub(bits, 8)
+                let mask := shl(bits, 0xff)
+                // invert the mask
+                mask := not(mask)
+                // should hold the value - prefix byte
+                ret := and(ret, mask)
+            }
+
+            // returns the `len` of the whole RLP list at `ptr`
+            // and the offset for the first value inside the list.
+            function decodeListLength(ptr) -> len, startOffset {
+                let b0 := byte(0, calldataload(ptr))
+                // In most cases, it is a long list. So we reorder the branch to reduce branch prediction miss.
+
+                // 0xf8 - 0xff, long list, length > 55
+                if gt(b0, 0xf7) {
+                    // the RLP encoding consists of a single byte with value 0xf7
+                    // plus the length in bytes of the length of the payload in binary form,
+                    // followed by the length of the payload, followed by the concatenation
+                    // of the RLP encodings of the items.
+                    // the extended length is ignored
+                    let lengthBytes := sub(b0, 0xf7)
+                    if gt(lengthBytes, 32) {
+                        invalid()
+                    }
+
+                    // load the extended length
+                    startOffset := add(ptr, 1)
+                    let extendedLen := calldataload(startOffset)
+                    let bits := sub(256, mul(lengthBytes, 8))
+                    extendedLen := shr(bits, extendedLen)
+
+                    len := add(extendedLen, lengthBytes)
+                    len := add(len, 1)
+                    startOffset := add(startOffset, lengthBytes)
+                    leave
+                }
+                // 0xc0 - 0xf7, short list, length <= 55
+                if gt(b0, 0xbf) {
+                    // the RLP encoding consists of a single byte with value 0xc0
+                    // plus the length of the list followed by the concatenation of
+                    // the RLP encodings of the items.
+                    len := sub(b0, 0xbf)
+                    startOffset := add(ptr, 1)
+                    leave
+                }
+                revertWith("Not list")
+            }
+
+            // returns the kind, calldata offset of the value and the length in bytes
+            // for the RLP encoded data item at `ptr`. used in `decodeFlat`
+            // kind = 0 means string/bytes, kind = 1 means list.
+            function decodeValue(ptr) -> kind, dataLen, valueOffset {
+                let b0 := byte(0, calldataload(ptr))
+
+                // 0x00 - 0x7f, single byte
+                if lt(b0, 0x80) {
+                    // for a single byte whose value is in the [0x00, 0x7f] range,
+                    // that byte is its own RLP encoding.
+                    dataLen := 1
+                    valueOffset := ptr
+                    leave
+                }
+
+                // 0x80 - 0xb7, short string/bytes, length <= 55
+                if lt(b0, 0xb8) {
+                    // the RLP encoding consists of a single byte with value 0x80
+                    // plus the length of the string followed by the string.
+                    dataLen := sub(b0, 0x80)
+                    valueOffset := add(ptr, 1)
+                    leave
+                }
+
+                // 0xb8 - 0xbf, long string/bytes, length > 55
+                if lt(b0, 0xc0) {
+                    // the RLP encoding consists of a single byte with value 0xb7
+                    // plus the length in bytes of the length of the string in binary form,
+                    // followed by the length of the string, followed by the string.
+                    let lengthBytes := sub(b0, 0xb7)
+                    if gt(lengthBytes, 4) {
+                        invalid()
+                    }
+
+                    // load the extended length
+                    valueOffset := add(ptr, 1)
+                    let extendedLen := calldataload(valueOffset)
+                    let bits := sub(256, mul(lengthBytes, 8))
+                    extendedLen := shr(bits, extendedLen)
+
+                    dataLen := extendedLen
+                    valueOffset := add(valueOffset, lengthBytes)
+                    leave
+                }
+
+                kind := 1
+                // 0xc0 - 0xf7, short list, length <= 55
+                if lt(b0, 0xf8) {
+                    // intentionally ignored
+                    // dataLen := sub(firstByte, 0xc0)
+                    valueOffset := add(ptr, 1)
+                    leave
+                }
+
+                // 0xf8 - 0xff, long list, length > 55
+                {
+                    // the extended length is ignored
+                    dataLen := sub(b0, 0xf7)
+                    valueOffset := add(ptr, 1)
+                    leave
+                }
+            }
+
+            // decodes all RLP encoded data and stores their DATA items
+            // [length - 128 bits | calldata offset - 128 bits] in a continous memory region.
+            // Expects that the RLP starts with a list that defines the length
+            // of the whole RLP region.
+            function decodeFlat(_ptr) -> ptr, memStart, nItems, hash {
+                ptr := _ptr
+
+                // load free memory ptr
+                // doesn't update the ptr and leaves the memory region dirty
+                memStart := mload(0x40)
+
+                let payloadLen, startOffset := decodeListLength(ptr)
+                // reuse memStart region and hash
+                calldatacopy(memStart, ptr, payloadLen)
+                hash := keccak256(memStart, payloadLen)
+
+                let memPtr := memStart
+                let ptrStop := add(ptr, payloadLen)
+                ptr := startOffset
+
+                // decode until the end of the list
+                for {
+
+                } lt(ptr, ptrStop) {
+
+                } {
+                    let kind, len, valuePtr := decodeValue(ptr)
+                    ptr := add(len, valuePtr)
+
+                    if iszero(kind) {
+                        // store the length of the data and the calldata offset
+                        // low -------> high
+                        // |     128 bits    |   128 bits   |
+                        // | calldata offset | value length |
+                        mstore(memPtr, or(shl(128, len), valuePtr))
+                        memPtr := add(memPtr, 0x20)
+                    }
+                }
+
+                if iszero(eq(ptr, ptrStop)) {
+                    invalid()
+                }
+
+                nItems := div(sub(memPtr, memStart), 32)
+            }
+
+            // prefix gets truncated to 256 bits
+            // `depth` is untrusted and can lead to bogus
+            // shifts/masks. In that case, the remaining verification
+            // steps must fail or lead to an invalid stateRoot hash
+            // if the proof data is 'spoofed but valid'
+            function derivePath(key, depth) -> path {
+                path := key
+
+                let bits := mul(depth, 4)
+                {
+                    let mask := not(0)
+                    mask := shr(bits, mask)
+                    path := and(path, mask)
+                }
+
+                // even prefix
+                let prefix := 0x20
+                if mod(depth, 2) {
+                    // odd
+                    prefix := 0x3
+                }
+
+                // the prefix may be shifted outside bounds
+                // this is intended, see `loadValue`
+                bits := sub(256, bits)
+                prefix := shl(bits, prefix)
+                path := or(prefix, path)
+            }
+
+            // loads and aligns a value from calldata
+            // given the `len|offset` stored at `memPtr`
+            function loadValue(memPtr, idx) -> value {
+                let tmp := mload(add(memPtr, mul(32, idx)))
+                // assuming 0xffffff is sufficient for storing calldata offset
+                let offset := and(tmp, 0xffffff)
+                let len := shr(128, tmp)
+
+                if gt(len, 31) {
+                    // special case - truncating the value is intended.
+                    // this matches the behavior in `derivePath` that truncates to 256 bits.
+                    offset := add(offset, sub(len, 32))
+                    value := calldataload(offset)
+                    leave
+                }
+
+                // everything else is
+                // < 32 bytes - align the value
+                let bits := mul(sub(32, len), 8)
+                value := calldataload(offset)
+                value := shr(bits, value)
+            }
+
+            // loads and aligns a value from calldata
+            // given the `len|offset` stored at `memPtr`
+            // Same as `loadValue` except it returns also the size
+            // of the value.
+            function loadValueLen(memPtr, idx) -> value, len {
+                let tmp := mload(add(memPtr, mul(32, idx)))
+                // assuming 0xffffff is sufficient for storing calldata offset
+                let offset := and(tmp, 0xffffff)
+                len := shr(128, tmp)
+
+                if gt(len, 31) {
+                    // special case - truncating the value is intended.
+                    // this matches the behavior in `derivePath` that truncates to 256 bits.
+                    offset := add(offset, sub(len, 32))
+                    value := calldataload(offset)
+                    leave
+                }
+
+                // everything else is
+                // < 32 bytes - align the value
+                let bits := mul(sub(32, len), 8)
+                value := calldataload(offset)
+                value := shr(bits, value)
+            }
+
+            function loadPair(memPtr, idx) -> offset, len {
+                let tmp := mload(add(memPtr, mul(32, idx)))
+                // assuming 0xffffff is sufficient for storing calldata offset
+                offset := and(tmp, 0xffffff)
+                len := shr(128, tmp)
+            }
+
+            // decodes RLP at `_ptr`.
+            // reverts if the number of DATA items doesn't match `nValues`.
+            // returns the RLP data items at pos `v0`, `v1`
+            // and the size of `v1out`
+            function hashCompareSelect(_ptr, nValues, v0, v1) -> ptr, hash, v0out, v1out, v1outlen {
+                ptr := _ptr
+
+                let memStart, nItems
+                ptr, memStart, nItems, hash := decodeFlat(ptr)
+
+                if iszero(eq(nItems, nValues)) {
+                    revertWith("Node items mismatch")
+                }
+
+                v0out, v1outlen := loadValueLen(memStart, v0)
+                v1out, v1outlen := loadValueLen(memStart, v1)
+            }
+
+            // traverses the tree from the root to the node before the leaf.
+            // based on https://github.com/ethereum/go-ethereum/blob/master/trie/proof.go#L114
+            function walkTree(key, _ptr) -> ptr, rootHash, expectedHash, path {
+                ptr := _ptr
+
+                // the first byte is the number of nodes
+                let nodes := byte(0, calldataload(ptr))
+                ptr := add(ptr, 1)
+
+                // keeps track of ascend/descend - however you may look at a tree
+                let depth
+
+                // treat the leaf node with different logic
+                for {
+                    let i := 1
+                } lt(i, nodes) {
+                    i := add(i, 1)
+                } {
+                    let memStart, nItems, hash
+                    ptr, memStart, nItems, hash := decodeFlat(ptr)
+
+                    // first item is considered the root node.
+                    // Otherwise verifies that the hash of the current node
+                    // is the same as the previous choosen one.
+                    switch i
+                    case 1 {
+                        rootHash := hash
+                    }
+                    default {
+                        require(eq(hash, expectedHash), "Hash mismatch")
+                    }
+
+                    switch nItems
+                    case 2 {
+                        // extension node
+                        // load the second item.
+                        // this is the hash of the next node.
+                        let value, len := loadValueLen(memStart, 1)
+                        expectedHash := value
+
+                        // get the byte length of the first item
+                        // Note: the value itself is not validated
+                        // and it is instead assumed that any invalid
+                        // value is invalidated by comparing the root hash.
+                        let prefixLen := shr(128, mload(memStart))
+                        depth := add(depth, prefixLen)
+                    }
+                    case 17 {
+                        let bits := sub(252, mul(depth, 4))
+                        let nibble := and(shr(bits, key), 0xf)
+
+                        // load the value at pos `nibble`
+                        let value, len := loadValueLen(memStart, nibble)
+
+                        expectedHash := value
+                        depth := add(depth, 1)
+                    }
+                    default {
+                        // everything else is unexpected
+                        revertWith("Invalid node")
+                    }
+                }
+
+                // lastly, derive the path of the choosen one (TM)
+                path := derivePath(key, depth)
+            }
+
+            // shared variable names
+            let storageHash
+            let encodedPath
+            let path
+            let hash
+            let vlen
+            // starting point
+            let ptr := proof.offset
+
+            {
+                // account proof
+                // Note: this doesn't work if there are no intermediate nodes before the leaf.
+                // This is not possible in practice because of the fact that there must be at least
+                // 2 accounts in the tree to make a transaction to a existing contract possible.
+                // Thus, 2 leaves.
+                let prevHash
+                let key := keccak_20(account)
+                // `stateRoot` is a return value and must be checked by the caller
+                ptr, stateRoot, prevHash, path := walkTree(key, ptr)
+
+                let memStart, nItems
+                ptr, memStart, nItems, hash := decodeFlat(ptr)
+
+                // the hash of the leaf must match the previous hash from the node
+                require(eq(hash, prevHash), "Account leaf hash mismatch")
+
+                // 2 items
+                // - encoded path
+                // - account leaf RLP (4 items)
+                require(eq(nItems, 2), "Account leaf node mismatch")
+
+                encodedPath := loadValue(memStart, 0)
+                // the calculated path must match the encoded path in the leaf
+                require(eq(path, encodedPath), "Account encoded path mismatch")
+
+                // Load the position, length of the second element (RLP encoded)
+                let leafPtr, leafLen := loadPair(memStart, 1)
+                leafPtr, memStart, nItems, hash := decodeFlat(leafPtr)
+
+                // the account leaf should contain 4 values,
+                // we want:
+                // - storageHash @ 2
+                require(eq(nItems, 4), "Account leaf items mismatch")
+                storageHash := loadValue(memStart, 2)
+            }
+
+            {
+                // storage proof
+                let rootHash
+                let key := keccak_32(storageKey)
+                ptr, rootHash, hash, path := walkTree(key, ptr)
+
+                // leaf should contain 2 values
+                // - encoded path @ 0
+                // - storageValue @ 1
+                ptr, hash, encodedPath, storageValue, vlen := hashCompareSelect(ptr, 2, 0, 1)
+                // the calculated path must match the encoded path in the leaf
+                require(eq(path, encodedPath), "Storage encoded path mismatch")
+
+                switch rootHash
+                case 0 {
+                    // in the case that the leaf is the only element, then
+                    // the hash of the leaf must match the value from the account leaf
+                    require(eq(hash, storageHash), "Storage root mismatch")
+                }
+                default {
+                    // otherwise the root hash of the storage tree
+                    // must match the value from the account leaf
+                    require(eq(rootHash, storageHash), "Storage root mismatch")
+                }
+
+                // storageValue is a return value
+                storageValue := decodeItem(storageValue, vlen)
+            }
+
+            // the one and only boundary check
+            // in case an attacker crafted a malicous payload
+            // and succeeds in the prior verification steps
+            // then this should catch any bogus accesses
+            if iszero(eq(ptr, add(proof.offset, proof.length))) {
+                revertWith("Proof length mismatch")
+            }
         }
-        mstore(0x24, msgLen) // str.length
-        revert(0x00, 0x64)
-      }
-      // reverts with `msg` when condition is not matched.
-      // make sure the length of error string <= 32
-      function require(cond, msg) {
-        if iszero(cond) {
-          revertWith(msg)
-        }
-      }
-
-      // special function for decoding the storage value
-      // because of the prefix truncation if value > 31 bytes
-      // see `loadValue`
-      function decodeItem(word, len) -> ret {
-        // default
-        ret := word
-
-        // RLP single byte
-        if lt(word, 0x80) {
-          leave
-        }
-
-        // truncated
-        if gt(len, 32) {
-          leave
-        }
-
-        // value is >= 0x80 and <= 32 bytes.
-        // `len` should be at least 2 (prefix byte + value)
-        // otherwise the RLP is malformed.
-        let bits := mul(len, 8)
-        // sub 8 bits - the prefix
-        bits := sub(bits, 8)
-        let mask := shl(bits, 0xff)
-        // invert the mask
-        mask := not(mask)
-        // should hold the value - prefix byte
-        ret := and(ret, mask)
-      }
-
-      // returns the `len` of the whole RLP list at `ptr`
-      // and the offset for the first value inside the list.
-      function decodeListLength(ptr) -> len, startOffset {
-        let b0 := byte(0, calldataload(ptr))
-        // In most cases, it is a long list. So we reorder the branch to reduce branch prediction miss.
-
-        // 0xf8 - 0xff, long list, length > 55
-        if gt(b0, 0xf7) {
-          // the RLP encoding consists of a single byte with value 0xf7 
-          // plus the length in bytes of the length of the payload in binary form,
-          // followed by the length of the payload, followed by the concatenation 
-          // of the RLP encodings of the items.
-          // the extended length is ignored
-          let lengthBytes := sub(b0, 0xf7)
-          if gt(lengthBytes, 32) {
-            invalid()
-          }
-
-          // load the extended length
-          startOffset := add(ptr, 1)
-          let extendedLen := calldataload(startOffset)
-          let bits := sub(256, mul(lengthBytes, 8))
-          extendedLen := shr(bits, extendedLen)
-
-          len := add(extendedLen, lengthBytes)
-          len := add(len, 1)
-          startOffset := add(startOffset, lengthBytes)
-          leave
-        }
-        // 0xc0 - 0xf7, short list, length <= 55
-        if gt(b0, 0xbf) {
-          // the RLP encoding consists of a single byte with value 0xc0
-          // plus the length of the list followed by the concatenation of
-          // the RLP encodings of the items.
-          len := sub(b0, 0xbf)
-          startOffset := add(ptr, 1)
-          leave
-        }
-        revertWith("Not list")
-      }
-
-      // returns the kind, calldata offset of the value and the length in bytes
-      // for the RLP encoded data item at `ptr`. used in `decodeFlat`
-      // kind = 0 means string/bytes, kind = 1 means list.
-      function decodeValue(ptr) -> kind, dataLen, valueOffset {
-        let b0 := byte(0, calldataload(ptr))
-
-        // 0x00 - 0x7f, single byte
-        if lt(b0, 0x80) {
-          // for a single byte whose value is in the [0x00, 0x7f] range,
-          // that byte is its own RLP encoding.
-          dataLen := 1
-          valueOffset := ptr
-          leave
-        }
-
-        // 0x80 - 0xb7, short string/bytes, length <= 55
-        if lt(b0, 0xb8) {
-          // the RLP encoding consists of a single byte with value 0x80
-          // plus the length of the string followed by the string.
-          dataLen := sub(b0, 0x80)
-          valueOffset := add(ptr, 1)
-          leave
-        }
-
-        // 0xb8 - 0xbf, long string/bytes, length > 55
-        if lt(b0, 0xc0) {
-          // the RLP encoding consists of a single byte with value 0xb7
-          // plus the length in bytes of the length of the string in binary form,
-          // followed by the length of the string, followed by the string.
-          let lengthBytes := sub(b0, 0xb7)
-          if gt(lengthBytes, 4) {
-            invalid()
-          }
-
-          // load the extended length
-          valueOffset := add(ptr, 1)
-          let extendedLen := calldataload(valueOffset)
-          let bits := sub(256, mul(lengthBytes, 8))
-          extendedLen := shr(bits, extendedLen)
-
-          dataLen := extendedLen
-          valueOffset := add(valueOffset, lengthBytes)
-          leave
-        }
-
-        kind := 1
-        // 0xc0 - 0xf7, short list, length <= 55
-        if lt(b0, 0xf8) {
-          // intentionally ignored
-          // dataLen := sub(firstByte, 0xc0)
-          valueOffset := add(ptr, 1)
-          leave
-        }
-
-        // 0xf8 - 0xff, long list, length > 55
-        {
-          // the extended length is ignored
-          dataLen := sub(b0, 0xf7)
-          valueOffset := add(ptr, 1)
-          leave
-        }
-      }
-
-      // decodes all RLP encoded data and stores their DATA items
-      // [length - 128 bits | calldata offset - 128 bits] in a continous memory region.
-      // Expects that the RLP starts with a list that defines the length
-      // of the whole RLP region.
-      function decodeFlat(_ptr) -> ptr, memStart, nItems, hash {
-        ptr := _ptr
-
-        // load free memory ptr
-        // doesn't update the ptr and leaves the memory region dirty
-        memStart := mload(0x40)
-
-        let payloadLen, startOffset := decodeListLength(ptr)
-        // reuse memStart region and hash
-        calldatacopy(memStart, ptr, payloadLen)
-        hash := keccak256(memStart, payloadLen)
-
-        let memPtr := memStart
-        let ptrStop := add(ptr, payloadLen)
-        ptr := startOffset
-
-        // decode until the end of the list
-        for {} lt(ptr, ptrStop) {} {
-          let kind, len, valuePtr := decodeValue(ptr)
-          ptr := add(len, valuePtr)
-
-          if iszero(kind) {
-            // store the length of the data and the calldata offset
-            // low -------> high
-            // |     128 bits    |   128 bits   |
-            // | calldata offset | value length |
-            mstore(memPtr, or(shl(128, len), valuePtr))
-            memPtr := add(memPtr, 0x20)
-          }
-        }
-
-        if iszero(eq(ptr, ptrStop)) {
-          invalid()
-        }
-
-        nItems := div( sub(memPtr, memStart), 32 )
-      }
-
-      // prefix gets truncated to 256 bits
-      // `depth` is untrusted and can lead to bogus
-      // shifts/masks. In that case, the remaining verification
-      // steps must fail or lead to an invalid stateRoot hash
-      // if the proof data is 'spoofed but valid'
-      function derivePath(key, depth) -> path {
-        path := key
-
-        let bits := mul(depth, 4)
-        {
-          let mask := not(0)
-          mask := shr(bits, mask)
-          path := and(path, mask)
-        }
-
-        // even prefix
-        let prefix := 0x20
-        if mod(depth, 2) {
-          // odd
-          prefix := 0x3
-        }
-
-        // the prefix may be shifted outside bounds
-        // this is intended, see `loadValue`
-        bits := sub(256, bits)
-        prefix := shl(bits, prefix)
-        path := or(prefix, path)
-      }
-
-      // loads and aligns a value from calldata
-      // given the `len|offset` stored at `memPtr`
-      function loadValue(memPtr, idx) -> value {
-        let tmp := mload(add(memPtr, mul(32, idx)))
-        // assuming 0xffffff is sufficient for storing calldata offset
-        let offset := and(tmp, 0xffffff)
-        let len := shr(128, tmp)
-
-        if gt(len, 31) {
-          // special case - truncating the value is intended.
-          // this matches the behavior in `derivePath` that truncates to 256 bits.
-          offset := add(offset, sub(len, 32))
-          value := calldataload(offset)
-          leave
-        }
-
-        // everything else is
-        // < 32 bytes - align the value
-        let bits := mul( sub(32, len), 8)
-        value := calldataload(offset)
-        value := shr(bits, value)
-      }
-
-      // loads and aligns a value from calldata
-      // given the `len|offset` stored at `memPtr`
-      // Same as `loadValue` except it returns also the size
-      // of the value.
-      function loadValueLen(memPtr, idx) -> value, len {
-        let tmp := mload(add(memPtr, mul(32, idx)))
-        // assuming 0xffffff is sufficient for storing calldata offset
-        let offset := and(tmp, 0xffffff)
-        len := shr(128, tmp)
-
-        if gt(len, 31) {
-          // special case - truncating the value is intended.
-          // this matches the behavior in `derivePath` that truncates to 256 bits.
-          offset := add(offset, sub(len, 32))
-          value := calldataload(offset)
-          leave
-        }
-
-        // everything else is
-        // < 32 bytes - align the value
-        let bits := mul( sub(32, len), 8)
-        value := calldataload(offset)
-        value := shr(bits, value)
-      }
-
-      function loadPair(memPtr, idx) -> offset, len {
-        let tmp := mload(add(memPtr, mul(32, idx)))
-        // assuming 0xffffff is sufficient for storing calldata offset
-        offset := and(tmp, 0xffffff)
-        len := shr(128, tmp)
-      }
-
-      // decodes RLP at `_ptr`.
-      // reverts if the number of DATA items doesn't match `nValues`.
-      // returns the RLP data items at pos `v0`, `v1`
-      // and the size of `v1out`
-      function hashCompareSelect(_ptr, nValues, v0, v1) -> ptr, hash, v0out, v1out, v1outlen {
-        ptr := _ptr
-
-        let memStart, nItems
-        ptr, memStart, nItems, hash := decodeFlat(ptr)
-
-        if iszero( eq(nItems, nValues) ) {
-          revertWith('Node items mismatch')
-        }
-
-        v0out, v1outlen := loadValueLen(memStart, v0)
-        v1out, v1outlen := loadValueLen(memStart, v1)
-      }
-
-      // traverses the tree from the root to the node before the leaf.
-      // based on https://github.com/ethereum/go-ethereum/blob/master/trie/proof.go#L114
-      function walkTree(key, _ptr) -> ptr, rootHash, expectedHash, path {
-        ptr := _ptr
-
-        // the first byte is the number of nodes
-        let nodes := byte(0, calldataload(ptr))
-        ptr := add(ptr, 1)
-
-        // keeps track of ascend/descend - however you may look at a tree
-        let depth
-
-        // treat the leaf node with different logic
-        for { let i := 1 } lt(i, nodes) { i := add(i, 1) } {
-          let memStart, nItems, hash
-          ptr, memStart, nItems, hash := decodeFlat(ptr)
-
-          // first item is considered the root node.
-          // Otherwise verifies that the hash of the current node
-          // is the same as the previous choosen one.
-          switch i
-          case 1 {
-            rootHash := hash
-          } default {
-            require(eq(hash, expectedHash), 'Hash mismatch')
-          }
-
-          switch nItems
-          case 2 {
-            // extension node
-            // load the second item.
-            // this is the hash of the next node.
-            let value, len := loadValueLen(memStart, 1)
-            expectedHash := value
-
-            // get the byte length of the first item
-            // Note: the value itself is not validated
-            // and it is instead assumed that any invalid
-            // value is invalidated by comparing the root hash.
-            let prefixLen := shr(128, mload(memStart))
-            depth := add(depth, prefixLen)
-          }
-          case 17 {
-            let bits := sub(252, mul(depth, 4))
-            let nibble := and(shr(bits, key), 0xf)
-
-            // load the value at pos `nibble`
-            let value, len := loadValueLen(memStart, nibble)
-
-            expectedHash := value
-            depth := add(depth, 1)
-          }
-          default {
-            // everything else is unexpected
-            revertWith('Invalid node')
-          }
-        }
-
-        // lastly, derive the path of the choosen one (TM)
-        path := derivePath(key, depth)
-      }
-      
-      // shared variable names
-      let storageHash
-      let encodedPath
-      let path
-      let hash
-      let vlen
-      // starting point
-      let ptr := proof.offset
-
-      {
-        // account proof
-        // Note: this doesn't work if there are no intermediate nodes before the leaf.
-        // This is not possible in practice because of the fact that there must be at least
-        // 2 accounts in the tree to make a transaction to a existing contract possible.
-        // Thus, 2 leaves.
-        let prevHash
-        let key := keccak_20(account)
-        // `stateRoot` is a return value and must be checked by the caller
-        ptr, stateRoot, prevHash, path := walkTree(key, ptr)
-
-        let memStart, nItems
-        ptr, memStart, nItems, hash := decodeFlat(ptr)
-
-        // the hash of the leaf must match the previous hash from the node
-        require(eq(hash, prevHash), 'Account leaf hash mismatch')
-
-        // 2 items
-        // - encoded path
-        // - account leaf RLP (4 items)
-        require(eq(nItems, 2), "Account leaf node mismatch")
-
-        encodedPath := loadValue(memStart, 0)
-        // the calculated path must match the encoded path in the leaf
-        require(eq(path, encodedPath), 'Account encoded path mismatch')
-
-        // Load the position, length of the second element (RLP encoded)
-        let leafPtr, leafLen := loadPair(memStart, 1)
-        leafPtr, memStart, nItems, hash := decodeFlat(leafPtr)
-
-        // the account leaf should contain 4 values,
-        // we want:
-        // - storageHash @ 2
-        require(eq(nItems, 4), "Account leaf items mismatch")
-        storageHash := loadValue(memStart, 2)
-      }
-
-      {
-        // storage proof
-        let rootHash
-        let key := keccak_32(storageKey)
-        ptr, rootHash, hash, path := walkTree(key, ptr)
-
-        // leaf should contain 2 values
-        // - encoded path @ 0
-        // - storageValue @ 1
-        ptr, hash, encodedPath, storageValue, vlen := hashCompareSelect(ptr, 2, 0, 1)
-        // the calculated path must match the encoded path in the leaf
-        require(eq(path, encodedPath), 'Storage encoded path mismatch')
-
-        switch rootHash
-        case 0 {
-          // in the case that the leaf is the only element, then
-          // the hash of the leaf must match the value from the account leaf
-          require(eq(hash, storageHash), 'Storage root mismatch')
-        }
-        default {
-          // otherwise the root hash of the storage tree
-          // must match the value from the account leaf
-          require(eq(rootHash, storageHash), 'Storage root mismatch')
-        }
-
-        // storageValue is a return value
-        storageValue := decodeItem(storageValue, vlen)
-      }
-
-      // the one and only boundary check
-      // in case an attacker crafted a malicous payload
-      // and succeeds in the prior verification steps
-      // then this should catch any bogus accesses
-      if iszero( eq(ptr, add(proof.offset, proof.length)) ) {
-        revertWith('Proof length mismatch')
-      }
     }
-  }
-}
+}

contracts/src/libraries/verifier/WithdrawTrieVerifier.sol

@@ -3,36 +3,36 @@
 pragma solidity ^0.8.0;
 
 library WithdrawTrieVerifier {
-  function verifyMerkleProof(
-    bytes32 _root,
-    bytes32 _hash,
-    uint256 _nonce,
-    bytes memory _proof
-  ) internal pure returns (bool) {
-    require(_proof.length % 256 == 0, "Invalid proof");
-    uint256 _length = _proof.length / 256;
+    function verifyMerkleProof(
+        bytes32 _root,
+        bytes32 _hash,
+        uint256 _nonce,
+        bytes memory _proof
+    ) internal pure returns (bool) {
+        require(_proof.length % 256 == 0, "Invalid proof");
+        uint256 _length = _proof.length / 256;
 
-    for (uint256 i = 0; i < _length; i++) {
-      bytes32 item;
-      assembly {
-        item := mload(add(add(_proof, 0x20), mul(i, 0x20)))
-      }
-      if (_nonce % 2 == 0) {
-        _hash = _efficientHash(_hash, item);
-      } else {
-        _hash = _efficientHash(item, _hash);
-      }
-      _nonce /= 2;
+        for (uint256 i = 0; i < _length; i++) {
+            bytes32 item;
+            assembly {
+                item := mload(add(add(_proof, 0x20), mul(i, 0x20)))
+            }
+            if (_nonce % 2 == 0) {
+                _hash = _efficientHash(_hash, item);
+            } else {
+                _hash = _efficientHash(item, _hash);
+            }
+            _nonce /= 2;
+        }
+        return _hash == _root;
     }
-    return _hash == _root;
-  }
 
-  function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
-    // solhint-disable-next-line no-inline-assembly
-    assembly {
-      mstore(0x00, a)
-      mstore(0x20, b)
-      value := keccak256(0x00, 0x40)
+    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
+        // solhint-disable-next-line no-inline-assembly
+        assembly {
+            mstore(0x00, a)
+            mstore(0x20, b)
+            value := keccak256(0x00, 0x40)
+        }
     }
-  }
 }

contracts/src/libraries/verifier/ZkTrieVerifier.sol

@@ -3,254 +3,257 @@
 pragma solidity ^0.8.0;
 
 interface PoseidonUnit2 {
-  function poseidon(uint256[2] memory) external view returns (uint256);
+    function poseidon(uint256[2] memory) external view returns (uint256);
 }
 
 library ZkTrieVerifier {
-  /// @notice Internal function to validates a proof from eth_getProof.
-  /// @param poseidon The address of poseidon hash contract.
-  /// @param account The address of the contract.
-  /// @param storageKey The storage slot to verify.
-  /// @param proof The rlp encoding result of eth_getProof.
-  /// @return stateRoot The computed state root. Must be checked by the caller.
-  /// @return storageValue The value of `storageKey`.
-  ///
-  /// @dev The code is based on
-  /// 1. https://github.com/scroll-tech/go-ethereum/blob/staging/trie/zk_trie.go#L176
-  /// 2. https://github.com/scroll-tech/zktrie/blob/main/trie/zk_trie_proof.go#L30
-  ///
-  /// The encoding order of `proof` is
-  /// ```text
-  /// |        1 byte        |      ...      |        1 byte        |      ...      |
-  /// | account proof length | account proof | storage proof length | storage proof |
-  /// ```
-  function verifyZkTrieProof(
-    address poseidon,
-    address account,
-    bytes32 storageKey,
-    bytes calldata proof
-  ) internal view returns (bytes32 stateRoot, bytes32 storageValue) {
-    assembly {
-      // reverts with error `msg`.
-      // make sure the length of error string <= 32
-      function revertWith(msg) {
-        // keccak("Error(string)")
-        mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
-        mstore(0x04, 0x20) // str.offset
-        mstore(0x44, msg)
-        let msgLen
-        for {
+    /// @notice Internal function to validates a proof from eth_getProof.
+    /// @param poseidon The address of poseidon hash contract.
+    /// @param account The address of the contract.
+    /// @param storageKey The storage slot to verify.
+    /// @param proof The rlp encoding result of eth_getProof.
+    /// @return stateRoot The computed state root. Must be checked by the caller.
+    /// @return storageValue The value of `storageKey`.
+    ///
+    /// @dev The code is based on
+    /// 1. https://github.com/scroll-tech/go-ethereum/blob/staging/trie/zk_trie.go#L176
+    /// 2. https://github.com/scroll-tech/zktrie/blob/main/trie/zk_trie_proof.go#L30
+    ///
+    /// The encoding order of `proof` is
+    /// ```text
+    /// |        1 byte        |      ...      |        1 byte        |      ...      |
+    /// | account proof length | account proof | storage proof length | storage proof |
+    /// ```
+    function verifyZkTrieProof(
+        address poseidon,
+        address account,
+        bytes32 storageKey,
+        bytes calldata proof
+    ) internal view returns (bytes32 stateRoot, bytes32 storageValue) {
+        assembly {
+            // reverts with error `msg`.
+            // make sure the length of error string <= 32
+            function revertWith(msg) {
+                // keccak("Error(string)")
+                mstore(0x00, 0x08c379a000000000000000000000000000000000000000000000000000000000)
+                mstore(0x04, 0x20) // str.offset
+                mstore(0x44, msg)
+                let msgLen
+                for {
 
-        } msg {
+                } msg {
 
-        } {
-          msg := shl(8, msg)
-          msgLen := add(msgLen, 1)
+                } {
+                    msg := shl(8, msg)
+                    msgLen := add(msgLen, 1)
+                }
+                mstore(0x24, msgLen) // str.length
+                revert(0x00, 0x64)
+            }
+            // reverts with `msg` when condition is not matched.
+            // make sure the length of error string <= 32
+            function require(cond, msg) {
+                if iszero(cond) {
+                    revertWith(msg)
+                }
+            }
+            // compute poseidon hash of two uint256
+            function poseidon_hash(hasher, v0, v1) -> r {
+                let x := mload(0x40)
+                // keccack256("poseidon(uint256[2])")
+                mstore(x, 0x29a5f2f600000000000000000000000000000000000000000000000000000000)
+                mstore(add(x, 0x04), v0)
+                mstore(add(x, 0x24), v1)
+                let success := staticcall(gas(), hasher, x, 0x44, 0x20, 0x20)
+                require(success, "poseidon hash failed")
+                r := mload(0x20)
+            }
+            // compute poseidon hash of 1 uint256
+            function hash_uint256(hasher, v) -> r {
+                r := poseidon_hash(hasher, shr(128, v), and(v, 0xffffffffffffffffffffffffffffffff))
+            }
+
+            // traverses the tree from the root to the node before the leaf.
+            // based on https://github.com/ethereum/go-ethereum/blob/master/trie/proof.go#L114
+            function walkTree(hasher, key, _ptr) -> ptr, rootHash, expectedHash {
+                ptr := _ptr
+
+                // the first byte is the number of nodes + 1
+                let nodes := sub(byte(0, calldataload(ptr)), 1)
+                ptr := add(ptr, 1)
+
+                // treat the leaf node with different logic
+                for {
+                    let depth := 1
+                } lt(depth, nodes) {
+                    depth := add(depth, 1)
+                } {
+                    // must be a parent node with two children
+                    let nodeType := byte(0, calldataload(ptr))
+                    ptr := add(ptr, 1)
+                    require(eq(nodeType, 0), "Invalid parent node")
+
+                    // load left/right child hash
+                    let childHashL := calldataload(ptr)
+                    ptr := add(ptr, 0x20)
+                    let childHashR := calldataload(ptr)
+                    ptr := add(ptr, 0x20)
+                    let hash := poseidon_hash(hasher, childHashL, childHashR)
+
+                    // first item is considered the root node.
+                    // Otherwise verifies that the hash of the current node
+                    // is the same as the previous choosen one.
+                    switch depth
+                    case 1 {
+                        rootHash := hash
+                    }
+                    default {
+                        require(eq(hash, expectedHash), "Hash mismatch")
+                    }
+
+                    // decide which path to walk based on key
+                    switch and(key, 1)
+                    case 0 {
+                        expectedHash := childHashL
+                    }
+                    default {
+                        expectedHash := childHashR
+                    }
+                    key := shr(1, key)
+                }
+            }
+
+            function checkProofMagicBytes(hasher, _ptr) -> ptr {
+                ptr := _ptr
+                let x := mload(0x40)
+                calldatacopy(x, ptr, 0x2d)
+                x := keccak256(x, 0x2d)
+                require(
+                    eq(x, 0x950654da67865a81bc70e45f3230f5179f08e29c66184bf746f71050f117b3b8),
+                    "Invalid ProofMagicBytes"
+                )
+                ptr := add(ptr, 0x2d) // skip ProofMagicBytes
+            }
+
+            // shared variable names
+            let storageHash
+            // starting point
+            let ptr := proof.offset
+
+            // verify account proof
+            {
+                let leafHash
+                let key := hash_uint256(poseidon, shl(96, account))
+
+                // `stateRoot` is a return value and must be checked by the caller
+                ptr, stateRoot, leafHash := walkTree(poseidon, key, ptr)
+
+                require(eq(1, byte(0, calldataload(ptr))), "Invalid leaf node")
+                ptr := add(ptr, 0x01) // skip NodeType
+                require(eq(calldataload(ptr), key), "Node key mismatch")
+                ptr := add(ptr, 0x20) // skip NodeKey
+                {
+                    let valuePreimageLength := and(shr(224, calldataload(ptr)), 0xffff)
+                    // @todo check CompressedFlag
+                    ptr := add(ptr, 0x04) // skip CompressedFlag
+                    ptr := add(ptr, valuePreimageLength) // skip ValuePreimage
+                }
+
+                // compute value hash for State Account Leaf Node
+                {
+                    let tmpHash1 := calldataload(ptr)
+                    ptr := add(ptr, 0x20) // skip nonce/codesize/0
+                    tmpHash1 := poseidon_hash(poseidon, tmpHash1, calldataload(ptr))
+                    ptr := add(ptr, 0x20) // skip balance
+                    storageHash := calldataload(ptr)
+                    ptr := add(ptr, 0x20) // skip StorageRoot
+                    let tmpHash2 := hash_uint256(poseidon, calldataload(ptr))
+                    ptr := add(ptr, 0x20) // skip KeccakCodeHash
+                    tmpHash2 := poseidon_hash(poseidon, storageHash, tmpHash2)
+                    tmpHash2 := poseidon_hash(poseidon, tmpHash1, tmpHash2)
+                    tmpHash2 := poseidon_hash(poseidon, tmpHash2, calldataload(ptr))
+                    ptr := add(ptr, 0x20) // skip PoseidonCodeHash
+
+                    tmpHash1 := poseidon_hash(poseidon, 1, key)
+                    tmpHash1 := poseidon_hash(poseidon, tmpHash1, tmpHash2)
+
+                    require(eq(leafHash, tmpHash1), "Invalid leaf node hash")
+                }
+
+                require(eq(0x20, byte(0, calldataload(ptr))), "Invalid KeyPreimage length")
+                ptr := add(ptr, 0x01) // skip KeyPreimage length
+                require(eq(shl(96, account), calldataload(ptr)), "Invalid KeyPreimage")
+                ptr := add(ptr, 0x20) // skip KeyPreimage
+
+                // compare ProofMagicBytes
+                ptr := checkProofMagicBytes(poseidon, ptr)
+            }
+
+            // verify storage proof
+            {
+                let leafHash
+                let key := hash_uint256(poseidon, storageKey)
+                {
+                    let rootHash
+                    ptr, rootHash, leafHash := walkTree(poseidon, key, ptr)
+
+                    switch rootHash
+                    case 0 {
+                        // in the case that the leaf is the only element, then
+                        // the hash of the leaf must match the value from the account leaf
+                        require(eq(leafHash, storageHash), "Storage root mismatch")
+                    }
+                    default {
+                        // otherwise the root hash of the storage tree
+                        // must match the value from the account leaf
+                        require(eq(rootHash, storageHash), "Storage root mismatch")
+                    }
+                }
+
+                switch byte(0, calldataload(ptr))
+                case 1 {
+                    ptr := add(ptr, 0x01) // skip NodeType
+                    require(eq(calldataload(ptr), key), "Node key mismatch")
+                    ptr := add(ptr, 0x20) // skip NodeKey
+                    {
+                        let valuePreimageLength := and(shr(224, calldataload(ptr)), 0xffff)
+                        // @todo check CompressedFlag
+                        ptr := add(ptr, 0x04) // skip CompressedFlag
+                        ptr := add(ptr, valuePreimageLength) // skip ValuePreimage
+                    }
+
+                    storageValue := calldataload(ptr)
+                    ptr := add(ptr, 0x20) // skip StorageValue
+
+                    mstore(0x00, hash_uint256(poseidon, storageValue))
+                    key := poseidon_hash(poseidon, 1, key)
+                    mstore(0x00, poseidon_hash(poseidon, key, mload(0x00)))
+                    require(eq(leafHash, mload(0x00)), "Invalid leaf node hash")
+
+                    require(eq(0x20, byte(0, calldataload(ptr))), "Invalid KeyPreimage length")
+                    ptr := add(ptr, 0x01) // skip KeyPreimage length
+                    require(eq(storageKey, calldataload(ptr)), "Invalid KeyPreimage")
+                    ptr := add(ptr, 0x20) // skip KeyPreimage
+                }
+                case 2 {
+                    ptr := add(ptr, 0x01) // skip NodeType
+                    require(eq(leafHash, 0), "Invalid empty node hash")
+                }
+                default {
+                    revertWith("Invalid leaf node")
+                }
+
+                // compare ProofMagicBytes
+                ptr := checkProofMagicBytes(poseidon, ptr)
+            }
+
+            // the one and only boundary check
+            // in case an attacker crafted a malicous payload
+            // and succeeds in the prior verification steps
+            // then this should catch any bogus accesses
+            if iszero(eq(ptr, add(proof.offset, proof.length))) {
+                revertWith("Proof length mismatch")
+            }
         }
-        mstore(0x24, msgLen) // str.length
-        revert(0x00, 0x64)
-      }
-      // reverts with `msg` when condition is not matched.
-      // make sure the length of error string <= 32
-      function require(cond, msg) {
-        if iszero(cond) {
-          revertWith(msg)
-        }
-      }
-      // compute poseidon hash of two uint256
-      function poseidon_hash(hasher, v0, v1) -> r {
-        let x := mload(0x40)
-        // keccack256("poseidon(uint256[2])")
-        mstore(x, 0x29a5f2f600000000000000000000000000000000000000000000000000000000)
-        mstore(add(x, 0x04), v0)
-        mstore(add(x, 0x24), v1)
-        let success := staticcall(gas(), hasher, x, 0x44, 0x20, 0x20)
-        require(success, "poseidon hash failed")
-        r := mload(0x20)
-      }
-      // compute poseidon hash of 1 uint256
-      function hash_uint256(hasher, v) -> r {
-        r := poseidon_hash(hasher, shr(128, v), and(v, 0xffffffffffffffffffffffffffffffff))
-      }
-
-      // traverses the tree from the root to the node before the leaf.
-      // based on https://github.com/ethereum/go-ethereum/blob/master/trie/proof.go#L114
-      function walkTree(hasher, key, _ptr) -> ptr, rootHash, expectedHash {
-        ptr := _ptr
-
-        // the first byte is the number of nodes + 1
-        let nodes := sub(byte(0, calldataload(ptr)), 1)
-        ptr := add(ptr, 1)
-
-        // treat the leaf node with different logic
-        for {
-          let depth := 1
-        } lt(depth, nodes) {
-          depth := add(depth, 1)
-        } {
-          // must be a parent node with two children
-          let nodeType := byte(0, calldataload(ptr))
-          ptr := add(ptr, 1)
-          require(eq(nodeType, 0), "Invalid parent node")
-
-          // load left/right child hash
-          let childHashL := calldataload(ptr)
-          ptr := add(ptr, 0x20)
-          let childHashR := calldataload(ptr)
-          ptr := add(ptr, 0x20)
-          let hash := poseidon_hash(hasher, childHashL, childHashR)
-
-          // first item is considered the root node.
-          // Otherwise verifies that the hash of the current node
-          // is the same as the previous choosen one.
-          switch depth
-          case 1 {
-            rootHash := hash
-          }
-          default {
-            require(eq(hash, expectedHash), "Hash mismatch")
-          }
-
-          // decide which path to walk based on key
-          switch and(key, 1)
-          case 0 {
-            expectedHash := childHashL
-          }
-          default {
-            expectedHash := childHashR
-          }
-          key := shr(1, key)
-        }
-      }
-
-      function checkProofMagicBytes(hasher, _ptr) -> ptr {
-        ptr := _ptr
-        let x := mload(0x40)
-        calldatacopy(x, ptr, 0x2d)
-        x := keccak256(x, 0x2d)
-        require(eq(x, 0x950654da67865a81bc70e45f3230f5179f08e29c66184bf746f71050f117b3b8), "Invalid ProofMagicBytes")
-        ptr := add(ptr, 0x2d) // skip ProofMagicBytes
-      }
-
-      // shared variable names
-      let storageHash
-      // starting point
-      let ptr := proof.offset
-
-      // verify account proof
-      {
-        let leafHash
-        let key := hash_uint256(poseidon, shl(96, account))
-
-        // `stateRoot` is a return value and must be checked by the caller
-        ptr, stateRoot, leafHash := walkTree(poseidon, key, ptr)
-
-        require(eq(1, byte(0, calldataload(ptr))), "Invalid leaf node")
-        ptr := add(ptr, 0x01) // skip NodeType
-        require(eq(calldataload(ptr), key), "Node key mismatch")
-        ptr := add(ptr, 0x20) // skip NodeKey
-        {
-          let valuePreimageLength := and(shr(224, calldataload(ptr)), 0xffff)
-          // @todo check CompressedFlag
-          ptr := add(ptr, 0x04) // skip CompressedFlag
-          ptr := add(ptr, valuePreimageLength) // skip ValuePreimage
-        }
-
-        // compute value hash for State Account Leaf Node
-        {
-          let tmpHash1 := calldataload(ptr)
-          ptr := add(ptr, 0x20) // skip nonce/codesize/0
-          tmpHash1 := poseidon_hash(poseidon, tmpHash1, calldataload(ptr))
-          ptr := add(ptr, 0x20) // skip balance
-          storageHash := calldataload(ptr)
-          ptr := add(ptr, 0x20) // skip StorageRoot
-          let tmpHash2 := hash_uint256(poseidon, calldataload(ptr))
-          ptr := add(ptr, 0x20) // skip KeccakCodeHash
-          tmpHash2 := poseidon_hash(poseidon, storageHash, tmpHash2)
-          tmpHash2 := poseidon_hash(poseidon, tmpHash1, tmpHash2)
-          tmpHash2 := poseidon_hash(poseidon, tmpHash2, calldataload(ptr))
-          ptr := add(ptr, 0x20) // skip PoseidonCodeHash
-
-          tmpHash1 := poseidon_hash(poseidon, 1, key)
-          tmpHash1 := poseidon_hash(poseidon, tmpHash1, tmpHash2)
-
-          require(eq(leafHash, tmpHash1), "Invalid leaf node hash")
-        }
-
-        require(eq(0x20, byte(0, calldataload(ptr))), "Invalid KeyPreimage length")
-        ptr := add(ptr, 0x01) // skip KeyPreimage length
-        require(eq(shl(96, account), calldataload(ptr)), "Invalid KeyPreimage")
-        ptr := add(ptr, 0x20) // skip KeyPreimage
-
-        // compare ProofMagicBytes
-        ptr := checkProofMagicBytes(poseidon, ptr)
-      }
-
-      // verify storage proof
-      {
-        let leafHash
-        let key := hash_uint256(poseidon, storageKey)
-        {
-          let rootHash
-          ptr, rootHash, leafHash := walkTree(poseidon, key, ptr)
-
-          switch rootHash
-          case 0 {
-            // in the case that the leaf is the only element, then
-            // the hash of the leaf must match the value from the account leaf
-            require(eq(leafHash, storageHash), "Storage root mismatch")
-          }
-          default {
-            // otherwise the root hash of the storage tree
-            // must match the value from the account leaf
-            require(eq(rootHash, storageHash), "Storage root mismatch")
-          }
-        }
-
-        switch byte(0, calldataload(ptr))
-        case 1 {
-          ptr := add(ptr, 0x01) // skip NodeType
-          require(eq(calldataload(ptr), key), "Node key mismatch")
-          ptr := add(ptr, 0x20) // skip NodeKey
-          {
-            let valuePreimageLength := and(shr(224, calldataload(ptr)), 0xffff)
-            // @todo check CompressedFlag
-            ptr := add(ptr, 0x04) // skip CompressedFlag
-            ptr := add(ptr, valuePreimageLength) // skip ValuePreimage
-          }
-
-          storageValue := calldataload(ptr)
-          ptr := add(ptr, 0x20) // skip StorageValue
-
-          mstore(0x00, hash_uint256(poseidon, storageValue))
-          key := poseidon_hash(poseidon, 1, key)
-          mstore(0x00, poseidon_hash(poseidon, key, mload(0x00)))
-          require(eq(leafHash, mload(0x00)), "Invalid leaf node hash")
-
-          require(eq(0x20, byte(0, calldataload(ptr))), "Invalid KeyPreimage length")
-          ptr := add(ptr, 0x01) // skip KeyPreimage length
-          require(eq(storageKey, calldataload(ptr)), "Invalid KeyPreimage")
-          ptr := add(ptr, 0x20) // skip KeyPreimage
-        }
-        case 2 {
-          ptr := add(ptr, 0x01) // skip NodeType
-          require(eq(leafHash, 0), "Invalid empty node hash")
-        }
-        default {
-          revertWith("Invalid leaf node")
-        }
-
-        // compare ProofMagicBytes
-        ptr := checkProofMagicBytes(poseidon, ptr)
-      }
-
-      // the one and only boundary check
-      // in case an attacker crafted a malicous payload
-      // and succeeds in the prior verification steps
-      // then this should catch any bogus accesses
-      if iszero(eq(ptr, add(proof.offset, proof.length))) {
-        revertWith("Proof length mismatch")
-      }
     }
-  }
 }