Add deposit index to beacon state (#2232)

* Begin adding Deposit Index to beacon state * Move deposit index increment to ProcessDeposit * Fix initial deposits bug * Fix bug in RPC * More bug fixes * Fix RPC bug, ensure deposits are processed in the right order * Fix tests * Fix merge * Attempt to fix pruning deposits on regular sync * Fix pending deposits on node restart * Fix test * Fix tests properly * Gofmt * Remove unneeded logs * Fix build
2026-01-09 21:38:05 -05:00 · 2019-04-14 04:17:39 -04:00
parent 19a5e35be9
commit 62279489a3
22 changed files with 494 additions and 190 deletions
--- a/beacon-chain/blockchain/block_processing_test.go
+++ b/beacon-chain/blockchain/block_processing_test.go
@@ -280,7 +280,7 @@ func TestReceiveBlock_RemovesPendingDeposits(t *testing.T) {
 	randaoReveal := createRandaoReveal(t, beaconState, privKeys)

 	pendingDeposits := []*pb.Deposit{
-		createPreChainStartDeposit(t, []byte{'F'}),
+		createPreChainStartDeposit(t, []byte{'F'}, beaconState.DepositIndex),
 	}
 	pendingDepositsData := make([][]byte, len(pendingDeposits))
 	for i, pd := range pendingDeposits {
@@ -296,7 +296,7 @@ func TestReceiveBlock_RemovesPendingDeposits(t *testing.T) {
 		if err != nil {
 			t.Fatalf("Could not generate proof: %v", err)
 		}
-		pendingDeposits[i].MerkleBranchHash32S = proof
+		pendingDeposits[i].MerkleProofHash32S = proof
 	}
 	depositRoot := depositTrie.Root()
 	beaconState.LatestEth1Data.DepositRootHash32 = depositRoot[:]
@@ -319,6 +319,7 @@ func TestReceiveBlock_RemovesPendingDeposits(t *testing.T) {
 	}

 	beaconState.Slot--
+	beaconState.DepositIndex = 0
 	if err := chainService.beaconDB.SaveState(ctx, beaconState); err != nil {
 		t.Fatal(err)
 	}
--- a/beacon-chain/blockchain/service_test.go
+++ b/beacon-chain/blockchain/service_test.go
@@ -172,20 +172,23 @@ func setupInitialDeposits(t *testing.T, numDeposits int) ([]*pb.Deposit, []*bls.
 		if err != nil {
 			t.Fatalf("Cannot encode data: %v", err)
 		}
-		deposits[i] = &pb.Deposit{DepositData: depositData}
+		deposits[i] = &pb.Deposit{
+			DepositData:     depositData,
+			MerkleTreeIndex: uint64(i),
+		}
 		privKeys[i] = priv
 	}
 	return deposits, privKeys
 }

-func createPreChainStartDeposit(t *testing.T, pk []byte) *pb.Deposit {
+func createPreChainStartDeposit(t *testing.T, pk []byte, index uint64) *pb.Deposit {
 	depositInput := &pb.DepositInput{Pubkey: pk}
 	balance := params.BeaconConfig().MaxDepositAmount
 	depositData, err := helpers.EncodeDepositData(depositInput, balance, time.Now().Unix())
 	if err != nil {
 		t.Fatalf("Cannot encode data: %v", err)
 	}
-	return &pb.Deposit{DepositData: depositData}
+	return &pb.Deposit{DepositData: depositData, MerkleTreeIndex: index}
 }

 func createRandaoReveal(t *testing.T, beaconState *pb.BeaconState, privKeys []*bls.SecretKey) []byte {
--- a/beacon-chain/chaintest/backend/helpers.go
+++ b/beacon-chain/chaintest/backend/helpers.go
@@ -86,9 +86,9 @@ func generateSimulatedBlock(
 		root := newTrie.Root()
 		block.Eth1Data.DepositRootHash32 = root[:]
 		block.Body.Deposits = append(block.Body.Deposits, &pb.Deposit{
-			DepositData:         data,
-			MerkleBranchHash32S: proof,
-			MerkleTreeIndex:     simObjects.simDeposit.MerkleIndex,
+			DepositData:        data,
+			MerkleProofHash32S: proof,
+			MerkleTreeIndex:    simObjects.simDeposit.MerkleIndex,
 		})
 	}
 	if simObjects.simProposerSlashing != nil {
--- a/beacon-chain/chaintest/backend/simulated_backend.go
+++ b/beacon-chain/chaintest/backend/simulated_backend.go
@@ -275,6 +275,7 @@ func (sb *SimulatedBackend) setupBeaconStateAndGenesisBlock(initialDeposits []*p
 	if err != nil {
 		return fmt.Errorf("could not initialize simulated beacon state: %v", err)
 	}
+	sb.historicalDeposits = initialDeposits

 	// We do not expect hashing initial beacon state and genesis block to
 	// fail, so we can safely ignore the error below.
--- a/beacon-chain/chaintest/tests/state-tests/block-processing.yaml
+++ b/beacon-chain/chaintest/tests/state-tests/block-processing.yaml
@@ -18,17 +18,17 @@ test_cases:
      deposits:
        - slot: 9223372036854775809
          amount: 32
-          merkle_index: 0
+          merkle_index: 64
          pubkey: !!binary |
            SlAAbShSkUg7PLiPHZI/rTS1uAvKiieOrifPN6Moso0=
        - slot: 9223372036854775823
          amount: 32
-          merkle_index: 1
+          merkle_index: 65
          pubkey: !!binary |
            Oklajsjdkaklsdlkajsdjlajslkdjlkasjlkdjlajdsd
        - slot: 9223372036854775863
          amount: 32
-          merkle_index: 2
+          merkle_index: 66
          pubkey: !!binary |
            LkmqmqoodLKAslkjdkajsdljasdkajlksjdasldjasdd
      proposer_slashings:
--- a/beacon-chain/core/blocks/block_operations.go
+++ b/beacon-chain/core/blocks/block_operations.go
@@ -601,13 +601,22 @@ func ProcessValidatorDeposits(
 }

 func verifyDeposit(beaconState *pb.BeaconState, deposit *pb.Deposit) error {
+	// Deposits must be processed in order
+	if deposit.MerkleTreeIndex != beaconState.DepositIndex {
+		return fmt.Errorf(
+			"expected deposit merkle tree index to match beacon state deposit index, wanted: %d, received: %d",
+			beaconState.DepositIndex,
+			deposit.MerkleTreeIndex,
+		)
+	}
+
 	// Verify Merkle proof of deposit and deposit trie root.
 	receiptRoot := beaconState.LatestEth1Data.DepositRootHash32
 	if ok := trieutil.VerifyMerkleProof(
 		receiptRoot,
 		deposit.DepositData,
 		int(deposit.MerkleTreeIndex),
-		deposit.MerkleBranchHash32S,
+		deposit.MerkleProofHash32S,
 	); !ok {
 		return fmt.Errorf(
 			"deposit merkle branch of deposit root did not verify for root: %#x",
--- a/beacon-chain/core/blocks/block_operations_test.go
+++ b/beacon-chain/core/blocks/block_operations_test.go
@@ -1078,9 +1078,9 @@ func TestProcessValidatorDeposits_MerkleBranchFailsVerification(t *testing.T) {
 	}

 	deposit := &pb.Deposit{
-		DepositData:         data,
-		MerkleBranchHash32S: proof,
-		MerkleTreeIndex:     0,
+		DepositData:        data,
+		MerkleProofHash32S: proof,
+		MerkleTreeIndex:    0,
 	}
 	block := &pb.BeaconBlock{
 		Body: &pb.BeaconBlockBody{
@@ -1151,9 +1151,9 @@ func TestProcessValidatorDeposits_ProcessDepositHelperFuncFails(t *testing.T) {
 		t.Fatalf("Could not generate proof: %v", err)
 	}
 	deposit := &pb.Deposit{
-		DepositData:         data,
-		MerkleBranchHash32S: proof,
-		MerkleTreeIndex:     0,
+		DepositData:        data,
+		MerkleProofHash32S: proof,
+		MerkleTreeIndex:    0,
 	}
 	block := &pb.BeaconBlock{
 		Body: &pb.BeaconBlockBody{
@@ -1190,6 +1190,75 @@ func TestProcessValidatorDeposits_ProcessDepositHelperFuncFails(t *testing.T) {
 	}
 }

+func TestProcessValidatorDeposits_IncorrectMerkleIndex(t *testing.T) {
+	depositInput := &pb.DepositInput{
+		Pubkey:                      []byte{1},
+		WithdrawalCredentialsHash32: []byte{1, 2, 3},
+		ProofOfPossession:           []byte{},
+	}
+	wBuf := new(bytes.Buffer)
+	if err := ssz.Encode(wBuf, depositInput); err != nil {
+		t.Fatalf("failed to encode deposit input: %v", err)
+	}
+	encodedInput := wBuf.Bytes()
+	data := []byte{}
+
+	// We set a deposit value of 1000.
+	value := make([]byte, 8)
+	depositValue := uint64(1000)
+	binary.LittleEndian.PutUint64(value, depositValue)
+
+	// We then serialize a unix time into the timestamp []byte slice
+	// and ensure it has size of 8 bytes.
+	timestamp := make([]byte, 8)
+
+	// Set deposit time to 1000 seconds since unix time 0.
+	depositTime := time.Unix(1000, 0).Unix()
+	// Set genesis time to unix time 0.
+	genesisTime := time.Unix(0, 0).Unix()
+
+	currentSlot := 1000 * params.BeaconConfig().SecondsPerSlot
+	binary.LittleEndian.PutUint64(timestamp, uint64(depositTime))
+
+	// We then create a serialized deposit data slice of type []byte
+	// by appending all 3 items above together.
+	data = append(data, value...)
+	data = append(data, timestamp...)
+	data = append(data, encodedInput...)
+
+	deposit := &pb.Deposit{
+		DepositData:        data,
+		MerkleProofHash32S: [][]byte{{0}},
+		MerkleTreeIndex:    1,
+	}
+	block := &pb.BeaconBlock{
+		Body: &pb.BeaconBlockBody{
+			Deposits: []*pb.Deposit{deposit},
+		},
+	}
+	registry := []*pb.Validator{
+		{
+			Pubkey:                      []byte{1},
+			WithdrawalCredentialsHash32: []byte{1, 2, 3},
+		},
+	}
+	balances := []uint64{0}
+	beaconState := &pb.BeaconState{
+		ValidatorRegistry: registry,
+		ValidatorBalances: balances,
+		Slot:              currentSlot,
+		GenesisTime:       uint64(genesisTime),
+	}
+
+	want := "expected deposit merkle tree index to match beacon state deposit index"
+	if _, err := blocks.ProcessValidatorDeposits(
+		beaconState,
+		block,
+	); !strings.Contains(err.Error(), want) {
+		t.Errorf("Expected error: %s, received %v", want, err)
+	}
+}
+
 func TestProcessValidatorDeposits_ProcessCorrectly(t *testing.T) {
 	depositInput := &pb.DepositInput{
 		Pubkey:                      []byte{1},
@@ -1237,9 +1306,9 @@ func TestProcessValidatorDeposits_ProcessCorrectly(t *testing.T) {
 	}

 	deposit := &pb.Deposit{
-		DepositData:         data,
-		MerkleBranchHash32S: proof,
-		MerkleTreeIndex:     0,
+		DepositData:        data,
+		MerkleProofHash32S: proof,
+		MerkleTreeIndex:    0,
 	}
 	block := &pb.BeaconBlock{
 		Body: &pb.BeaconBlockBody{
--- a/beacon-chain/core/state/state.go
+++ b/beacon-chain/core/state/state.go
@@ -120,6 +120,7 @@ func GenesisBeaconState(
 		// Eth1 data.
 		LatestEth1Data: eth1Data,
 		Eth1DataVotes:  []*pb.Eth1DataVote{},
+		DepositIndex:   0,
 	}

 	// Process initial deposits.
--- a/beacon-chain/core/state/state_test.go
+++ b/beacon-chain/core/state/state_test.go
@@ -76,9 +76,9 @@ func TestGenesisBeaconState_OK(t *testing.T) {
 			t.Fatalf("Could not encode deposit data: %v", err)
 		}
 		deposits = append(deposits, &pb.Deposit{
-			MerkleBranchHash32S: [][]byte{{1}, {2}, {3}},
-			MerkleTreeIndex:     0,
-			DepositData:         depositData,
+			MerkleProofHash32S: [][]byte{{1}, {2}, {3}},
+			MerkleTreeIndex:    0,
+			DepositData:        depositData,
 		})
 	}

--- a/beacon-chain/core/validators/validator.go
+++ b/beacon-chain/core/validators/validator.go
@@ -111,6 +111,8 @@ func ProcessDeposit(
 	var publicKeyExists bool
 	var existingValidatorIdx int

+	state.DepositIndex++
+
 	existingValidatorIdx, publicKeyExists = validatorIdxMap[bytesutil.ToBytes32(pubkey)]
 	if !publicKeyExists {
 		// If public key does not exist in the registry, we add a new validator
--- a/beacon-chain/db/pending_deposits.go
+++ b/beacon-chain/db/pending_deposits.go
@@ -94,34 +94,26 @@ func (db *BeaconDB) RemovePendingDeposit(ctx context.Context, d *pb.Deposit) {
 	}
 }

-// PrunePendingDeposits removes any deposit which is older than the given block number.
-func (db *BeaconDB) PrunePendingDeposits(ctx context.Context, b *big.Int) {
+// PrunePendingDeposits removes any deposit which is older than the given deposit merkle tree index.
+func (db *BeaconDB) PrunePendingDeposits(ctx context.Context, merkleTreeIndex uint64) {
 	ctx, span := trace.StartSpan(ctx, "BeaconDB.PrunePendingDeposits")
 	defer span.End()

-	if b == nil {
-		log.Debug("Ignoring nil deposit removal")
+	if merkleTreeIndex == 0 {
+		log.Debug("Ignoring 0 deposit removal")
 		return
 	}

 	db.depositsLock.Lock()
 	defer db.depositsLock.Unlock()

-	depositListSize := len(db.pendingDeposits)
-
-	// since list is sorted by block number it checks from the last
-	// added deposit and works backwards.
-	idx := -1
-	for i := depositListSize - 1; i >= 0; i-- {
-		if db.pendingDeposits[i].block.Cmp(b) == -1 {
-			idx = i
-			break
+	var cleanDeposits []*depositContainer
+	for _, dp := range db.pendingDeposits {
+		if dp.deposit.MerkleTreeIndex >= merkleTreeIndex {
+			cleanDeposits = append(cleanDeposits, dp)
 		}
 	}

-	if idx >= 0 {
-		db.pendingDeposits = db.pendingDeposits[idx+1:]
-	}
-
+	db.pendingDeposits = cleanDeposits
 	pendingDepositsCount.Set(float64(len(db.pendingDeposits)))
 }
--- a/beacon-chain/db/pending_deposits_test.go
+++ b/beacon-chain/db/pending_deposits_test.go
@@ -87,7 +87,7 @@ func TestPendingDeposits_OK(t *testing.T) {
 	}
 }

-func TestPrunePendingDeposits_NilBlock(t *testing.T) {
+func TestPrunePendingDeposits_ZeroMerkleIndex(t *testing.T) {
 	db := BeaconDB{}

 	db.pendingDeposits = []*depositContainer{
@@ -99,7 +99,7 @@ func TestPrunePendingDeposits_NilBlock(t *testing.T) {
 		{block: big.NewInt(12), deposit: &pb.Deposit{MerkleTreeIndex: 12}},
 	}

-	db.PrunePendingDeposits(context.Background(), nil)
+	db.PrunePendingDeposits(context.Background(), 0)
 	expected := []*depositContainer{
 		{block: big.NewInt(2), deposit: &pb.Deposit{MerkleTreeIndex: 2}},
 		{block: big.NewInt(4), deposit: &pb.Deposit{MerkleTreeIndex: 4}},
@@ -126,7 +126,7 @@ func TestPrunePendingDeposits_OK(t *testing.T) {
 		{block: big.NewInt(12), deposit: &pb.Deposit{MerkleTreeIndex: 12}},
 	}

-	db.PrunePendingDeposits(context.Background(), big.NewInt(6))
+	db.PrunePendingDeposits(context.Background(), 6)
 	expected := []*depositContainer{
 		{block: big.NewInt(6), deposit: &pb.Deposit{MerkleTreeIndex: 6}},
 		{block: big.NewInt(8), deposit: &pb.Deposit{MerkleTreeIndex: 8}},
@@ -147,7 +147,7 @@ func TestPrunePendingDeposits_OK(t *testing.T) {
 		{block: big.NewInt(12), deposit: &pb.Deposit{MerkleTreeIndex: 12}},
 	}

-	db.PrunePendingDeposits(context.Background(), big.NewInt(10))
+	db.PrunePendingDeposits(context.Background(), 10)
 	expected = []*depositContainer{
 		{block: big.NewInt(10), deposit: &pb.Deposit{MerkleTreeIndex: 10}},
 		{block: big.NewInt(12), deposit: &pb.Deposit{MerkleTreeIndex: 12}},
--- a/beacon-chain/powchain/block_reader_test.go
+++ b/beacon-chain/powchain/block_reader_test.go
@@ -7,6 +7,8 @@ import (
 	"testing"
 	"time"

+	"github.com/prysmaticlabs/prysm/beacon-chain/db"
+
 	"github.com/ethereum/go-ethereum/common"
 	gethTypes "github.com/ethereum/go-ethereum/core/types"
 )
@@ -17,6 +19,11 @@ func TestLatestMainchainInfo_OK(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Unable to set up simulated backend %v", err)
 	}
+
+	beaconDB, err := db.SetupDB()
+	if err != nil {
+		t.Fatalf("unable to set up simulated db instance: %v", err)
+	}
 	web3Service, err := NewWeb3Service(context.Background(), &Web3ServiceConfig{
 		Endpoint:        endpoint,
 		DepositContract: testAcc.contractAddr,
@@ -24,6 +31,7 @@ func TestLatestMainchainInfo_OK(t *testing.T) {
 		Logger:          &goodLogger{},
 		BlockFetcher:    &goodFetcher{},
 		ContractBackend: testAcc.backend,
+		BeaconDB:        beaconDB,
 	})
 	if err != nil {
 		t.Fatalf("unable to setup web3 ETH1.0 chain service: %v", err)
--- a/beacon-chain/powchain/log_processing.go
+++ b/beacon-chain/powchain/log_processing.go
@@ -173,6 +173,15 @@ func (w *Web3Service) processPastLogs() error {
 		w.ProcessLog(log)
 	}
 	w.lastRequestedBlock.Set(w.blockHeight)
+
+	currentState, err := w.beaconDB.HeadState(w.ctx)
+	if err != nil {
+		return fmt.Errorf("could not get head state: %v", err)
+	}
+	if currentState != nil && currentState.DepositIndex > 0 {
+		w.beaconDB.PrunePendingDeposits(w.ctx, currentState.DepositIndex)
+	}
+
 	return nil
 }

--- a/beacon-chain/powchain/service_test.go
+++ b/beacon-chain/powchain/service_test.go
@@ -11,6 +11,8 @@ import (
 	"testing"
 	"time"

+	"github.com/prysmaticlabs/prysm/beacon-chain/db"
+
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind/backends"
@@ -201,6 +203,11 @@ func TestStart_OK(t *testing.T) {
 	if err != nil {
 		t.Fatalf("Unable to set up simulated backend %v", err)
 	}
+
+	beaconDB, err := db.SetupDB()
+	if err != nil {
+		t.Fatalf("Could not set up simulated beacon DB: %v", err)
+	}
 	web3Service, err := NewWeb3Service(context.Background(), &Web3ServiceConfig{
 		Endpoint:        endpoint,
 		DepositContract: testAcc.contractAddr,
@@ -208,6 +215,7 @@ func TestStart_OK(t *testing.T) {
 		Logger:          &goodLogger{},
 		BlockFetcher:    &goodFetcher{},
 		ContractBackend: testAcc.backend,
+		BeaconDB:        beaconDB,
 	})
 	if err != nil {
 		t.Fatalf("unable to setup web3 ETH1.0 chain service: %v", err)
--- a/beacon-chain/rpc/beacon_server.go
+++ b/beacon-chain/rpc/beacon_server.go
@@ -214,7 +214,6 @@ func (bs *BeaconServer) PendingDeposits(ctx context.Context, _ *ptypes.Empty) (*
 		return &pb.PendingDepositsResponse{PendingDeposits: nil}, nil
 	}

-	pendingDeps := bs.beaconDB.PendingDeposits(ctx, bNum)
 	// Need to fetch if the deposits up to the state's latest eth 1 data matches
 	// the number of all deposits in this RPC call. If not, then we return nil.
 	beaconState, err := bs.beaconDB.HeadState(ctx)
@@ -244,6 +243,17 @@ func (bs *BeaconServer) PendingDeposits(ctx context.Context, _ *ptypes.Empty) (*
 		return nil, fmt.Errorf("could not generate historical deposit trie from deposits: %v", err)
 	}

+	allPendingDeps := bs.beaconDB.PendingDeposits(ctx, bNum)
+
+	// Deposits need to be received in order of merkle index root, so this has to make sure
+	// deposits are sorted from lowest to highest.
+	var pendingDeps []*pbp2p.Deposit
+	for _, dep := range allPendingDeps {
+		if dep.MerkleTreeIndex >= beaconState.DepositIndex {
+			pendingDeps = append(pendingDeps, dep)
+		}
+	}
+
 	for i := range pendingDeps {
 		// Don't construct merkle proof if the number of deposits is more than max allowed in block.
 		if uint64(i) == params.BeaconConfig().MaxDeposits {
@@ -306,6 +316,6 @@ func constructMerkleProof(trie *trieutil.MerkleTrie, deposit *pbp2p.Deposit) (*p
 	// For every deposit, we construct a Merkle proof using the powchain service's
 	// in-memory deposits trie, which is updated only once the state's LatestETH1Data
 	// property changes during a state transition after a voting period.
-	deposit.MerkleBranchHash32S = proof
+	deposit.MerkleProofHash32S = proof
 	return deposit, nil
 }
--- a/beacon-chain/rpc/beacon_server_test.go
+++ b/beacon-chain/rpc/beacon_server_test.go
@@ -305,6 +305,7 @@ func TestPendingDeposits_OutsideEth1FollowWindow(t *testing.T) {
 		LatestEth1Data: &pbp2p.Eth1Data{
 			BlockHash32: []byte("0x0"),
 		},
+		DepositIndex: 2,
 	}
 	if err := d.SaveState(ctx, beaconState); err != nil {
 		t.Fatal(err)
@@ -359,11 +360,89 @@ func TestPendingDeposits_OutsideEth1FollowWindow(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	if len(allResp.PendingDeposits) != len(readyDeposits) {
+	if len(allResp.PendingDeposits) != len(recentDeposits) {
 		t.Errorf(
 			"Received unexpected number of pending deposits: %d, wanted: %d",
 			len(allResp.PendingDeposits),
-			len(recentDeposits)+len(readyDeposits),
+			len(recentDeposits),
+		)
+	}
+}
+
+func TestPendingDeposits_CantReturnBelowStateDepositIndex(t *testing.T) {
+	ctx := context.Background()
+
+	height := big.NewInt(int64(params.BeaconConfig().Eth1FollowDistance))
+	p := &mockPOWChainService{
+		latestBlockNumber: height,
+		hashesByHeight: map[int][]byte{
+			int(height.Int64()): []byte("0x0"),
+		},
+	}
+	d := internal.SetupDB(t)
+
+	beaconState := &pbp2p.BeaconState{
+		LatestEth1Data: &pbp2p.Eth1Data{
+			BlockHash32: []byte("0x0"),
+		},
+		DepositIndex: 10,
+	}
+	if err := d.SaveState(ctx, beaconState); err != nil {
+		t.Fatal(err)
+	}
+
+	readyDeposits := []*pbp2p.Deposit{
+		{
+			MerkleTreeIndex: 0,
+			DepositData:     []byte("a"),
+		},
+		{
+			MerkleTreeIndex: 1,
+			DepositData:     []byte("b"),
+		},
+	}
+
+	var recentDeposits []*pbp2p.Deposit
+	for i := 2; i < 16; i++ {
+		recentDeposits = append(recentDeposits, &pbp2p.Deposit{
+			MerkleTreeIndex: uint64(i),
+			DepositData:     []byte{byte(i)},
+		})
+	}
+
+	for _, dp := range append(readyDeposits, recentDeposits...) {
+		d.InsertDeposit(ctx, dp, big.NewInt(int64(dp.MerkleTreeIndex)))
+	}
+	for _, dp := range recentDeposits {
+		d.InsertPendingDeposit(ctx, dp, big.NewInt(int64(dp.MerkleTreeIndex)))
+	}
+
+	bs := &BeaconServer{
+		beaconDB:        d,
+		powChainService: p,
+		chainService:    newMockChainService(),
+	}
+
+	// It should also return the recent deposits after their follow window.
+	p.latestBlockNumber = big.NewInt(0).Add(p.latestBlockNumber, big.NewInt(10000))
+	allResp, err := bs.PendingDeposits(ctx, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	expectedDeposits := 6
+	if len(allResp.PendingDeposits) != expectedDeposits {
+		t.Errorf(
+			"Received unexpected number of pending deposits: %d, wanted: %d",
+			len(allResp.PendingDeposits),
+			expectedDeposits,
+		)
+	}
+	if allResp.PendingDeposits[0].MerkleTreeIndex != beaconState.DepositIndex {
+		t.Errorf(
+			"Received unexpected merkle index: %d, wanted: %d",
+			allResp.PendingDeposits[0].MerkleTreeIndex,
+			beaconState.DepositIndex,
 		)
 	}
 }
@@ -384,6 +463,7 @@ func TestPendingDeposits_CantReturnMoreThanMax(t *testing.T) {
 		LatestEth1Data: &pbp2p.Eth1Data{
 			BlockHash32: []byte("0x0"),
 		},
+		DepositIndex: 2,
 	}
 	if err := d.SaveState(ctx, beaconState); err != nil {
 		t.Fatal(err)
--- a/beacon-chain/sync/initial-sync/sync_state.go
+++ b/beacon-chain/sync/initial-sync/sync_state.go
@@ -47,7 +47,7 @@ func (s *InitialSync) processState(msg p2p.Message) {
 		return
 	}

-	exists, blkNum, err := s.powchain.BlockExists(ctx, bytesutil.ToBytes32(finalizedState.LatestEth1Data.BlockHash32))
+	exists, _, err := s.powchain.BlockExists(ctx, bytesutil.ToBytes32(finalizedState.LatestEth1Data.BlockHash32))
 	if err != nil {
 		log.Errorf("Unable to get powchain block %v", err)
 	}
@@ -57,7 +57,7 @@ func (s *InitialSync) processState(msg p2p.Message) {
 		return
 	}

-	s.db.PrunePendingDeposits(ctx, blkNum)
+	s.db.PrunePendingDeposits(ctx, finalizedState.DepositIndex)

 	if err := s.db.UpdateChainHead(ctx, finalizedState.LatestBlock, finalizedState); err != nil {
 		log.Errorf("Could not update chain head: %v", err)
--- a/proto/beacon/p2p/v1/types.pb.go
+++ b/proto/beacon/p2p/v1/types.pb.go
@@ -78,6 +78,7 @@ type BeaconState struct {
 	LatestBlock                  *BeaconBlock          `protobuf:"bytes,3008,opt,name=latest_block,json=latestBlock,proto3" json:"latest_block,omitempty"`
 	LatestEth1Data               *Eth1Data             `protobuf:"bytes,4001,opt,name=latest_eth1_data,json=latestEth1Data,proto3" json:"latest_eth1_data,omitempty"`
 	Eth1DataVotes                []*Eth1DataVote       `protobuf:"bytes,4002,rep,name=eth1_data_votes,json=eth1DataVotes,proto3" json:"eth1_data_votes,omitempty"`
+	DepositIndex                 uint64                `protobuf:"varint,4003,opt,name=deposit_index,json=depositIndex,proto3" json:"deposit_index,omitempty"`
 	GenesisTime                  uint64                `protobuf:"varint,5001,opt,name=genesis_time,json=genesisTime,proto3" json:"genesis_time,omitempty"`
 	Fork                         *Fork                 `protobuf:"bytes,5002,opt,name=fork,proto3" json:"fork,omitempty"`
 	Slot                         uint64                `protobuf:"varint,5003,opt,name=slot,proto3" json:"slot,omitempty"`
@@ -301,6 +302,13 @@ func (m *BeaconState) GetEth1DataVotes() []*Eth1DataVote {
 	return nil
 }

+func (m *BeaconState) GetDepositIndex() uint64 {
+	if m != nil {
+		return m.DepositIndex
+	}
+	return 0
+}
+
 func (m *BeaconState) GetGenesisTime() uint64 {
 	if m != nil {
 		return m.GenesisTime
@@ -1467,7 +1475,7 @@ func (m *AttesterSlashing) GetSlashableAttestation_2() *SlashableAttestation {
 }

 type Deposit struct {
-	MerkleBranchHash32S  [][]byte `protobuf:"bytes,1,rep,name=merkle_branch_hash32s,json=merkleBranchHash32s,proto3" json:"merkle_branch_hash32s,omitempty"`
+	MerkleProofHash32S   [][]byte `protobuf:"bytes,1,rep,name=merkle_proof_hash32s,json=merkleProofHash32s,proto3" json:"merkle_proof_hash32s,omitempty"`
 	MerkleTreeIndex      uint64   `protobuf:"varint,2,opt,name=merkle_tree_index,json=merkleTreeIndex,proto3" json:"merkle_tree_index,omitempty"`
 	DepositData          []byte   `protobuf:"bytes,3,opt,name=deposit_data,json=depositData,proto3" json:"deposit_data,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
@@ -1508,9 +1516,9 @@ func (m *Deposit) XXX_DiscardUnknown() {

 var xxx_messageInfo_Deposit proto.InternalMessageInfo

-func (m *Deposit) GetMerkleBranchHash32S() [][]byte {
+func (m *Deposit) GetMerkleProofHash32S() [][]byte {
 	if m != nil {
-		return m.MerkleBranchHash32S
+		return m.MerkleProofHash32S
 	}
 	return nil
 }
@@ -1730,132 +1738,133 @@ func init() {
 func init() { proto.RegisterFile("proto/beacon/p2p/v1/types.proto", fileDescriptor_e719e7d82cfa7b0d) }

 var fileDescriptor_e719e7d82cfa7b0d = []byte{
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+	0x5a, 0x96, 0xa0, 0x35, 0x41, 0x51, 0xec, 0x3b, 0x50, 0xc9, 0x58, 0x93, 0xbd, 0x9a, 0x72, 0x4a,
+	0x57, 0xd0, 0x9b, 0x50, 0x8c, 0xa7, 0xad, 0xc2, 0xad, 0xaa, 0xde, 0xad, 0x89, 0x0a, 0x74, 0x0c,
+	0x05, 0x11, 0xb9, 0x21, 0x73, 0xba, 0x3e, 0xee, 0x31, 0x73, 0x6d, 0xc7, 0xd8, 0x2d, 0x35, 0x5e,
+	0xb9, 0xf0, 0xbd, 0x50, 0x6b, 0x49, 0xa9, 0xd7, 0x85, 0x90, 0x9d, 0x67, 0xe9, 0x87, 0xf5, 0x69,
+	0xc8, 0x67, 0x78, 0x28, 0x0f, 0x2b, 0x47, 0x6f, 0x1d, 0x9d, 0x1c, 0xed, 0x3f, 0xac, 0x7c, 0x08,
+	0x21, 0x28, 0xa9, 0x8f, 0x93, 0xc3, 0x03, 0xe7, 0xf0, 0x0b, 0x47, 0x27, 0x15, 0x03, 0x55, 0xa0,
+	0xf0, 0xf8, 0xe8, 0xe4, 0x8d, 0x03, 0x7b, 0xff, 0xf1, 0x7e, 0xf3, 0xe1, 0x61, 0x65, 0xc1, 0xf2,
+	0xa1, 0x2a, 0xf7, 0x69, 0x9b, 0x60, 0x26, 0x8a, 0x7d, 0x40, 0x02, 0x6e, 0x93, 0x0e, 0x8d, 0x5c,
+	0x91, 0x98, 0xe9, 0x5b, 0x42, 0x8d, 0x24, 0x55, 0xce, 0xa5, 0x84, 0xac, 0x66, 0xd2, 0xec, 0xc2,
+	0x8e, 0x5b, 0x40, 0x2e, 0x33, 0x51, 0xbe, 0x0c, 0x6b, 0x69, 0xe2, 0x27, 0x23, 0xc0, 0xc8, 0x8c,
+	0x80, 0x0b, 0x2a, 0x73, 0xe1, 0xdc, 0xca, 0xb4, 0x7e, 0xb8, 0x10, 0xbf, 0xd3, 0xd4, 0xbc, 0x9f,
+	0xd5, 0x86, 0x5e, 0x06, 0x14, 0x62, 0x39, 0xa1, 0xa6, 0x15, 0x57, 0x14, 0x27, 0x53, 0xeb, 0x77,
+	0x61, 0x5d, 0x04, 0x9c, 0xcc, 0xe8, 0x4b, 0x65, 0xc9, 0xc8, 0x60, 0x6f, 0x42, 0x51, 0x3f, 0xa3,
+	0x22, 0x32, 0x22, 0xd8, 0xd7, 0x4d, 0xa8, 0xa0, 0x88, 0xb6, 0xa4, 0xa1, 0xd7, 0x60, 0x2d, 0xdd,
+	0x3d, 0x96, 0x9e, 0x73, 0xf5, 0x58, 0x8d, 0x57, 0x05, 0x74, 0x15, 0xd6, 0xd2, 0x9e, 0xbc, 0x2c,
+	0xf5, 0xa7, 0x04, 0x51, 0xc3, 0x6d, 0xea, 0x9e, 0xc9, 0x2c, 0x3d, 0xa7, 0x86, 0x33, 0x21, 0x6a,
+	0x52, 0xf7, 0xcc, 0x96, 0x42, 0xd6, 0xb7, 0x72, 0x50, 0x9e, 0xe0, 0x88, 0xcd, 0x6b, 0x6c, 0x19,
+	0x54, 0x4f, 0xdc, 0x9b, 0xcf, 0xd1, 0x1c, 0xec, 0x31, 0x41, 0xf4, 0x18, 0x50, 0x18, 0xd1, 0x90,
+	0x32, 0x12, 0xa9, 0xbd, 0xd4, 0x0b, 0x7a, 0xcc, 0x5c, 0x90, 0xea, 0x76, 0xe7, 0xae, 0x96, 0x5a,
+	0xa2, 0xa5, 0x05, 0xec, 0xf5, 0x70, 0x82, 0x22, 0x15, 0xab, 0x83, 0xc6, 0x14, 0xe7, 0xce, 0x57,
+	0xbc, 0xaf, 0x25, 0x52, 0xc5, 0x78, 0x82, 0xc2, 0xd0, 0x7d, 0x58, 0xd5, 0x9b, 0x17, 0x33, 0x17,
+	0xa5, 0xba, 0xed, 0x79, 0xea, 0x0e, 0x14, 0xce, 0x4e, 0x04, 0xd0, 0x5b, 0x50, 0x1e, 0x51, 0x7f,
+	0x18, 0x70, 0x31, 0x97, 0x44, 0x47, 0x61, 0xe6, 0x92, 0xd4, 0xf1, 0xd2, 0xdc, 0x6a, 0x8f, 0xe1,
+	0x87, 0x4f, 0x3d, 0x6e, 0x97, 0x46, 0xd9, 0x4f, 0x66, 0x7d, 0xdb, 0x80, 0xc2, 0x41, 0xbc, 0x07,
+	0x86, 0x43, 0x3e, 0xb7, 0x83, 0xd6, 0x60, 0x23, 0x8c, 0x28, 0xed, 0x3a, 0xb4, 0xeb, 0x84, 0x94,
+	0x31, 0xc2, 0x92, 0x25, 0xac, 0x20, 0xc3, 0x47, 0xbb, 0x6f, 0x77, 0x8f, 0x13, 0xc6, 0xc5, 0x1d,
+	0x37, 0x77, 0x61, 0xc7, 0xb5, 0x9e, 0x00, 0x52, 0x37, 0x85, 0x7d, 0xb1, 0x15, 0x10, 0xf7, 0x05,
+	0x57, 0x80, 0xbb, 0xb0, 0x3e, 0x6f, 0xf6, 0x97, 0xdb, 0x13, 0x53, 0xec, 0x4f, 0x06, 0x5c, 0x92,
+	0x77, 0x84, 0xdb, 0x3e, 0xc9, 0x6e, 0x54, 0x1f, 0x85, 0xf5, 0xb1, 0x6e, 0xe5, 0x89, 0x07, 0x8f,
+	0x21, 0xdf, 0x3b, 0x95, 0x6c, 0xbf, 0x12, 0xf4, 0x99, 0xeb, 0xd0, 0xc2, 0xec, 0x75, 0x28, 0x1e,
+	0x8b, 0xb9, 0xff, 0x65, 0x2c, 0xbe, 0xf0, 0x2e, 0xf5, 0x0d, 0x03, 0xf2, 0xfa, 0x9e, 0x65, 0x10,
+	0x8f, 0xb2, 0x8f, 0x82, 0x70, 0xc8, 0xf5, 0x74, 0xbe, 0x75, 0x41, 0x26, 0xca, 0x1c, 0xc9, 0xbc,
+	0x1c, 0x74, 0xc6, 0xe0, 0x01, 0x1d, 0x06, 0x5c, 0x07, 0x5f, 0x7f, 0x89, 0x8e, 0x22, 0x5e, 0x12,
+	0x8c, 0xe3, 0x41, 0xa8, 0x9b, 0x75, 0x4a, 0xb0, 0x7e, 0xb1, 0x00, 0x95, 0xc9, 0x32, 0x14, 0x4b,
+	0x6f, 0x52, 0xcc, 0xd9, 0xc1, 0x50, 0x8c, 0xa9, 0x6a, 0x2e, 0xd8, 0x50, 0x0e, 0x75, 0x5e, 0xa8,
+	0x4e, 0x5e, 0x97, 0x47, 0x9f, 0xf7, 0x96, 0x9c, 0x4a, 0xa3, 0x58, 0x27, 0xf6, 0xc5, 0x57, 0x1d,
+	0x7d, 0x0c, 0x2e, 0x25, 0x3a, 0x93, 0x80, 0x3a, 0x75, 0x9d, 0x2e, 0x28, 0xcc, 0x28, 0x90, 0xac,
+	0xfa, 0xb4, 0x15, 0x6a, 0x39, 0x7c, 0x1f, 0x56, 0x34, 0xe6, 0x58, 0x11, 0x2f, 0x8e, 0xd3, 0x56,
+	0x34, 0xac, 0x3f, 0x1b, 0x50, 0x99, 0xec, 0x3a, 0xc8, 0x85, 0x2a, 0x8b, 0x73, 0x39, 0xfb, 0xe8,
+	0x76, 0xea, 0xfa, 0x9e, 0x5f, 0x9e, 0x67, 0xe2, 0xac, 0x12, 0xb0, 0x37, 0xd9, 0x0c, 0x6a, 0x7d,
+	0xfe, 0x29, 0x0d, 0x7d, 0x1d, 0xff, 0x87, 0x53, 0x1a, 0xd6, 0xbb, 0x06, 0xac, 0xe8, 0xec, 0x13,
+	0xe1, 0x19, 0x90, 0xe8, 0xd4, 0x27, 0x8e, 0xea, 0x45, 0xf1, 0x33, 0xdf, 0x90, 0xaf, 0x7c, 0xa4,
+	0x78, 0xc7, 0x82, 0x15, 0xbf, 0xf0, 0xef, 0xc2, 0xba, 0x96, 0xe0, 0x11, 0x21, 0x3a, 0xa9, 0x54,
+	0x9e, 0x96, 0x15, 0xe3, 0x24, 0x22, 0x44, 0xa5, 0xd5, 0x0d, 0x88, 0x13, 0xdb, 0x49, 0x2a, 0xb3,
+	0x60, 0xe7, 0xdd, 0xb4, 0x6c, 0x2c, 0x1f, 0x8a, 0x63, 0xfd, 0x74, 0xce, 0xae, 0x31, 0x63, 0xc3,
+	0x59, 0x98, 0xb9, 0xe1, 0x8c, 0x4d, 0xdd, 0xdc, 0xc4, 0xd4, 0xb5, 0xbe, 0x04, 0xab, 0xc9, 0x9f,
+	0x02, 0x35, 0xd8, 0x88, 0x8d, 0xcb, 0x76, 0x33, 0xd5, 0xa4, 0xd7, 0x35, 0x2b, 0xb3, 0x33, 0xdc,
+	0x80, 0x82, 0xea, 0x7d, 0x63, 0x7b, 0x48, 0x5e, 0xd2, 0x74, 0xcb, 0xf3, 0xa1, 0x90, 0xfd, 0xdf,
+	0x60, 0x7c, 0x83, 0x30, 0x5e, 0x78, 0x83, 0xb8, 0x06, 0x30, 0xa2, 0x9c, 0x38, 0x9d, 0x4c, 0x2f,
+	0x58, 0x13, 0x94, 0x07, 0x82, 0xd0, 0x2c, 0xfc, 0xf2, 0xd9, 0x75, 0xe3, 0x57, 0xcf, 0xae, 0x1b,
+	0x7f, 0x79, 0x76, 0xdd, 0x68, 0x2f, 0xcb, 0xff, 0xbf, 0x5f, 0xfd, 0x6f, 0x00, 0x00, 0x00, 0xff,
+	0xff, 0xc4, 0x8d, 0x74, 0xea, 0x57, 0x17, 0x00, 0x00,
 }

 func (m *BeaconState) Marshal() (dAtA []byte, err error) {
@@ -2146,6 +2155,15 @@ func (m *BeaconState) MarshalTo(dAtA []byte) (int, error) {
 			i += n
 		}
 	}
+	if m.DepositIndex != 0 {
+		dAtA[i] = 0x98
+		i++
+		dAtA[i] = 0xfa
+		i++
+		dAtA[i] = 0x1
+		i++
+		i = encodeVarintTypes(dAtA, i, uint64(m.DepositIndex))
+	}
 	if m.GenesisTime != 0 {
 		dAtA[i] = 0xc8
 		i++
@@ -2996,8 +3014,8 @@ func (m *Deposit) MarshalTo(dAtA []byte) (int, error) {
 	_ = i
 	var l int
 	_ = l
-	if len(m.MerkleBranchHash32S) > 0 {
-		for _, b := range m.MerkleBranchHash32S {
+	if len(m.MerkleProofHash32S) > 0 {
+		for _, b := range m.MerkleProofHash32S {
 			dAtA[i] = 0xa
 			i++
 			i = encodeVarintTypes(dAtA, i, uint64(len(b)))
@@ -3259,6 +3277,9 @@ func (m *BeaconState) Size() (n int) {
 			n += 3 + l + sovTypes(uint64(l))
 		}
 	}
+	if m.DepositIndex != 0 {
+		n += 3 + sovTypes(uint64(m.DepositIndex))
+	}
 	if m.GenesisTime != 0 {
 		n += 3 + sovTypes(uint64(m.GenesisTime))
 	}
@@ -3723,8 +3744,8 @@ func (m *Deposit) Size() (n int) {
 	}
 	var l int
 	_ = l
-	if len(m.MerkleBranchHash32S) > 0 {
-		for _, b := range m.MerkleBranchHash32S {
+	if len(m.MerkleProofHash32S) > 0 {
+		for _, b := range m.MerkleProofHash32S {
 			l = len(b)
 			n += 1 + l + sovTypes(uint64(l))
 		}
@@ -4674,6 +4695,25 @@ func (m *BeaconState) Unmarshal(dAtA []byte) error {
 				return err
 			}
 			iNdEx = postIndex
+		case 4003:
+			if wireType != 0 {
+				return fmt.Errorf("proto: wrong wireType = %d for field DepositIndex", wireType)
+			}
+			m.DepositIndex = 0
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowTypes
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				m.DepositIndex |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
 		case 5001:
 			if wireType != 0 {
 				return fmt.Errorf("proto: wrong wireType = %d for field GenesisTime", wireType)
@@ -7600,7 +7640,7 @@ func (m *Deposit) Unmarshal(dAtA []byte) error {
 		switch fieldNum {
 		case 1:
 			if wireType != 2 {
-				return fmt.Errorf("proto: wrong wireType = %d for field MerkleBranchHash32S", wireType)
+				return fmt.Errorf("proto: wrong wireType = %d for field MerkleProofHash32S", wireType)
 			}
 			var byteLen int
 			for shift := uint(0); ; shift += 7 {
@@ -7627,8 +7667,8 @@ func (m *Deposit) Unmarshal(dAtA []byte) error {
 			if postIndex > l {
 				return io.ErrUnexpectedEOF
 			}
-			m.MerkleBranchHash32S = append(m.MerkleBranchHash32S, make([]byte, postIndex-iNdEx))
-			copy(m.MerkleBranchHash32S[len(m.MerkleBranchHash32S)-1], dAtA[iNdEx:postIndex])
+			m.MerkleProofHash32S = append(m.MerkleProofHash32S, make([]byte, postIndex-iNdEx))
+			copy(m.MerkleProofHash32S[len(m.MerkleProofHash32S)-1], dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
 		case 2:
 			if wireType != 0 {
--- a/proto/beacon/p2p/v1/types.proto
+++ b/proto/beacon/p2p/v1/types.proto
@@ -41,6 +41,7 @@ message BeaconState {
  // Ethereum 1.0 chain data [4001-5000]
  Eth1Data latest_eth1_data = 4001;
  repeated Eth1DataVote eth1_data_votes = 4002;
+  uint64 deposit_index = 4003;

  // Miscellaneous [5001-6000]
  uint64 genesis_time = 5001;
@@ -173,7 +174,7 @@ message AttesterSlashing {
 }

 message Deposit {
-  repeated bytes merkle_branch_hash32s = 1;
+  repeated bytes merkle_proof_hash32s = 1;
  uint64 merkle_tree_index = 2;
  bytes deposit_data = 3;
 }
--- a/scripts/start-single-validator.sh
+++ b/scripts/start-single-validator.sh
@@ -0,0 +1,66 @@
+#!/bin/bash
+
+PRIVATE_KEY_PATH=~/priv
+
+DATA_PATH=/tmp/data
+
+PASSWORD="password"
+PASSWORD_PATH=$DATA_PATH/password.txt
+
+UNAME=$(echo `uname` | tr '[A-Z]' '[a-z]')
+
+echo $PASSWORD > $PASSWORD_PATH
+
+INDEX=9
+
+while test $# -gt 0; do
+    case "$1" in
+      --deposit-contract)
+          shift
+          DEPOSIT_CONTRACT=$1
+          shift
+          ;;
+      --index)
+          shift
+          INDEX=$1
+          shift
+          ;;
+      --privkey-path)
+          shift
+          PRIVATE_KEY_PATH=$1
+          shift
+          ;;
+      *)
+          echo "$1 is not a recognized flag!"
+          exit 1;
+          ;;
+    esac
+done
+
+KEYSTORE=$DATA_PATH/keystore$INDEX
+
+echo "Generating validator $INDEX"
+
+ACCOUNTCMD="bazel-bin/validator/${UNAME}_amd64_pure_stripped/validator accounts create --password $(cat $PASSWORD_PATH) --keystore-path $KEYSTORE"
+$ACCOUNTCMD
+
+
+echo "Sending TX for validator $INDEX"
+
+HTTPFLAG="--httpPath=https://goerli.infura.io/v3/be3fb7ed377c418087602876a40affa1"
+PASSFLAG="--passwordFile=$PASSWORD_PATH"
+CONTRACTFLAG="--depositContract=$DEPOSIT_CONTRACT"
+PRIVFLAG="--privKey=$(cat $PRIVATE_KEY_PATH)"
+KEYFLAG="--prysm-keystore=$KEYSTORE"
+AMOUNTFLAG="--depositAmount=3200000"
+
+CMD="bazel-bin/contracts/deposit-contract/sendDepositTx/${UNAME}_amd64_stripped/sendDepositTx"
+
+DEPOSITCMD="$CMD $HTTPFLAG $PASSFLAG $CONTRACTFLAG $PRIVFLAG $KEYFLAG $AMOUNTFLAG"
+
+$DEPOSITCMD
+
+echo "Started validator $INDEX"
+
+CMD="bazel-bin/validator/${UNAME}_amd64_pure_stripped/validator --beacon-rpc-provider localhost:4545 --password $(cat $PASSWORD_PATH) --keystore-path $KEYSTORE"
+$CMD
--- a/shared/trieutil/sparse_merkle.go
+++ b/shared/trieutil/sparse_merkle.go
@@ -3,6 +3,7 @@ package trieutil
 import (
 	"bytes"
 	"errors"
+	"fmt"

 	"github.com/prysmaticlabs/prysm/shared/bytesutil"
 	"github.com/prysmaticlabs/prysm/shared/hashutil"
@@ -86,8 +87,11 @@ func (m *MerkleTrie) Items() [][]byte {
 // index in the Merkle trie up to the root of the trie.
 func (m *MerkleTrie) MerkleProof(merkleIndex int) ([][]byte, error) {
 	lastLevel := m.branches[len(m.branches)-1]
-	if merkleIndex < 0 || merkleIndex >= len(lastLevel) || bytes.Equal(lastLevel[merkleIndex], []byte{}) {
-		return nil, errors.New("merkle index out of range in trie")
+	if merkleIndex < 0 || merkleIndex >= len(lastLevel) {
+		return nil, fmt.Errorf("merkle index out of range in trie, max range: %d, received: %d", len(lastLevel), merkleIndex)
+	}
+	if bytes.Equal(lastLevel[merkleIndex], []byte{}) {
+		return nil, fmt.Errorf("merkle index out of range in trie, key is empty at index: %d", merkleIndex)
 	}
 	branchIndices := BranchIndices(merkleIndex, len(m.branches))
 	// We create a list of proof indices, which do not include the root so the length