mv eip4844->deneb

fixing lint issues
make blob response typedef public
2026-01-10 13:58:09 -05:00 · 2023-01-23 11:51:07 -06:00 · 2023-01-23 11:37:43 -06:00 · 2023-01-23 07:03:08 -06:00 · 2023-01-19 17:30:36 -08:00 · 2023-01-18 14:02:09 -08:00
1120 changed files with 77519 additions and 15247 deletions
--- a/.bazelrc
+++ b/.bazelrc
@@ -21,7 +21,6 @@ build --sandbox_default_allow_network=false

 # Stamp binaries with git information
 build --workspace_status_command=./hack/workspace_status.sh
-build --stamp

 # Prevent PATH changes from rebuilding when switching from IDE to command line.
 build --incompatible_strict_action_env
@@ -38,7 +37,7 @@ build:minimal --@io_bazel_rules_go//go/config:tags=minimal

 # Release flags
 build:release --compilation_mode=opt
-build:release --config=llvm
+build:release --stamp

 # LLVM compiler for building C/C++ dependencies.
 build:llvm --define compiler=llvm
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@@ -16,12 +16,12 @@ Existing issues often contain information about workarounds, resolution, or prog

 ### Description

-<!-- ✍️--> A clear and concise description of the problem or missing capability...
+<!-- ✍️ A clear and concise description of the problem or missing capability... --> 

 ### Describe the solution you'd like

-<!-- ✍️--> If you have a solution in mind, please describe it.
+<!-- ✍️ If you have a solution in mind, please describe it. --> 

 ### Describe alternatives you've considered

-<!-- ✍️--> Have you considered any alternative solutions or workarounds?
+<!-- ✍️ Have you considered any alternative solutions or workarounds? --> 
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -26,10 +26,10 @@ jobs:
    steps:
      - name: Checkout
        uses: actions/checkout@v2
-      - name: Set up Go 1.18
+      - name: Set up Go 1.19
        uses: actions/setup-go@v3
        with:
-          go-version: 1.18
+          go-version: 1.19
      - name: Run Gosec Security Scanner
        run: | # https://github.com/securego/gosec/issues/469
          export PATH=$PATH:$(go env GOPATH)/bin
@@ -43,16 +43,16 @@ jobs:
      - name: Checkout
        uses: actions/checkout@v2

-      - name: Set up Go 1.18
+      - name: Set up Go 1.19
        uses: actions/setup-go@v3
        with:
-          go-version: 1.18
+          go-version: 1.19
          id: go

      - name: Golangci-lint
        uses: golangci/golangci-lint-action@v3
        with:
-          version: v1.47.2
+          version: v1.50.1
          args: --config=.golangci.yml --out-${NO_FUTURE}format colored-line-number

  build:
@@ -62,7 +62,7 @@ jobs:
      - name: Set up Go 1.x
        uses: actions/setup-go@v2
        with:
-          go-version: 1.18
+          go-version: 1.19
        id: go

      - name: Check out code into the Go module directory
--- a/.gitignore
+++ b/.gitignore
@@ -38,3 +38,6 @@ metaData

 # execution API authentication
 jwt.hex
+
+# manual testing
+tmp
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -6,7 +6,7 @@ run:
    - proto
    - tools/analyzers
  timeout: 10m
-  go: '1.18'
+  go: '1.19'

 linters:
  disable-all: true
--- a/DEPENDENCIES.md
+++ b/DEPENDENCIES.md
@@ -1,4 +1,4 @@
-# Dependency Managagement in Prysm
+# Dependency Management in Prysm

 Prysm is go project with many complicated dependencies, including some c++ based libraries. There
 are two parts to Prysm's dependency management. Go modules and bazel managed dependencies. Be sure 
@@ -28,7 +28,7 @@ including complicated c++ dependencies.
 One key advantage of Bazel over vanilla `go build` is that Bazel automatically (re)builds generated
 pb.go files at build time when file changes are present in any protobuf definition file or after
 any updates to the protobuf compiler or other relevant dependencies. Vanilla go users should run
-the following scripts often to ensure their generated files are up to date. Further more, Prysm
+the following scripts often to ensure their generated files are up to date. Furthermore, Prysm
 generates SSZ marshal related code based on defined data structures. These generated files must
 also be updated and checked in as frequently.

--- a/45
+++ b/45
@@ -88,10 +88,10 @@ http_archive(
        # Expose internals of go_test for custom build transitions.
        "//third_party:io_bazel_rules_go_test.patch",
    ],
-    sha256 = "099a9fb96a376ccbbb7d291ed4ecbdfd42f6bc822ab77ae6f1b5cb9e914e94fa",
+    sha256 = "ae013bf35bd23234d1dea46b079f1e05ba74ac0321423830119d3e787ec73483",
    urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.35.0/rules_go-v0.35.0.zip",
-        "https://github.com/bazelbuild/rules_go/releases/download/v0.35.0/rules_go-v0.35.0.zip",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.36.0/rules_go-v0.36.0.zip",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.36.0/rules_go-v0.36.0.zip",
    ],
 )

@@ -110,13 +110,6 @@ git_repository(
    # gazelle args: -go_prefix github.com/gogo/protobuf -proto legacy
 )

-http_archive(
-    name = "fuzzit_linux",
-    build_file_content = "exports_files([\"fuzzit\"])",
-    sha256 = "9ca76ac1c22d9360936006efddf992977ebf8e4788ded8e5f9d511285c9ac774",
-    urls = ["https://github.com/fuzzitdev/fuzzit/releases/download/v2.4.76/fuzzit_Linux_x86_64.zip"],
-)
-
 load(
    "@io_bazel_rules_docker//repositories:repositories.bzl",
    container_repositories = "repositories",
@@ -164,35 +157,15 @@ container_pull(
    repository = "pinglamb/alpine-glibc",
 )

-container_pull(
-    name = "fuzzit_base",
-    digest = "sha256:24a39a4360b07b8f0121eb55674a2e757ab09f0baff5569332fefd227ee4338f",
-    registry = "gcr.io",
-    repository = "fuzzit-public/stretch-llvm8",
-)
-
 load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")

 go_rules_dependencies()

 go_register_toolchains(
-    go_version = "1.18.5",
+    go_version = "1.19.4",
    nogo = "@//:nogo",
 )

-http_archive(
-    name = "prysm_testnet_site",
-    build_file_content = """
-proto_library(
-  name = "faucet_proto",
-  srcs = ["src/proto/faucet.proto"],
-  visibility = ["//visibility:public"],
-)""",
-    sha256 = "29742136ff9faf47343073c4569a7cf21b8ed138f726929e09e3c38ab83544f7",
-    strip_prefix = "prysm-testnet-site-5c711600f0a77fc553b18cf37b880eaffef4afdb",
-    url = "https://github.com/prestonvanloon/prysm-testnet-site/archive/5c711600f0a77fc553b18cf37b880eaffef4afdb.tar.gz",
-)
-
 http_archive(
    name = "io_kubernetes_build",
    sha256 = "b84fbd1173acee9d02a7d3698ad269fdf4f7aa081e9cecd40e012ad0ad8cfa2a",
@@ -215,7 +188,7 @@ filegroup(
    url = "https://github.com/eth-clients/slashing-protection-interchange-tests/archive/b8413ca42dc92308019d0d4db52c87e9e125c4e9.tar.gz",
 )

-consensus_spec_version = "v1.2.0"
+consensus_spec_version = "v1.3.0-rc.1"

 bls_test_version = "v0.1.1"

@@ -231,7 +204,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "eded065f923a99b78372d6f748c9b3f1de8229f8f574c1fec9c5fe76c8affb65",
+    sha256 = "3d6fadb64674eb64a84fae6c2efa9949231ea91e7cb74ada9214097323e86569",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/general.tar.gz" % consensus_spec_version,
 )

@@ -247,7 +220,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "2ed83783129e93360f4bf9d5d5f606ee28adbe8b458acdfac61b8d99218d16a9",
+    sha256 = "54ffbcab1e77316a280e6f5a64c6ed62351e8f5678e6fa49340e49b9b5575e8e",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/minimal.tar.gz" % consensus_spec_version,
 )

@@ -263,7 +236,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "f5eff2adac78c99a4180491f373328465263caa2cba0206308a7c598abf76cda",
+    sha256 = "bb06d30ca533dc97d45f2367916ba9ff1b5af52f08a9d8c33bb7b1a61254094e",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/mainnet.tar.gz" % consensus_spec_version,
 )

@@ -278,7 +251,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "f1a33b7459391716defa4c2b6f0c1bd7ccc38471ce9126d752d3bad767bebf2b",
+    sha256 = "9d22246c00ec3907ef8dc3ddccdfe6f7153ce46df73deee0a0176fe7e4aa1126",
    strip_prefix = "consensus-specs-" + consensus_spec_version[1:],
    url = "https://github.com/ethereum/consensus-specs/archive/refs/tags/%s.tar.gz" % consensus_spec_version,
 )
--- a/api/client/beacon/doc.go
+++ b/api/client/beacon/doc.go
@@ -1,6 +1,5 @@
 /*
 Package beacon provides a client for interacting with the standard Eth Beacon Node API.
 Interactive swagger documentation for the API is available here: https://ethereum.github.io/beacon-APIs/
-
 */
 package beacon
--- a/api/client/builder/client_test.go
+++ b/api/client/builder/client_test.go
@@ -81,7 +81,7 @@ func TestClient_Status(t *testing.T) {

 func TestClient_RegisterValidator(t *testing.T) {
 	ctx := context.Background()
-	expectedBody := `[{"message":{"fee_recipient":"0x0000000000000000000000000000000000000000","gas_limit":"23","timestamp":"42","pubkey":"0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"}}]`
+	expectedBody := `[{"message":{"fee_recipient":"0x0000000000000000000000000000000000000000","gas_limit":"23","timestamp":"42","pubkey":"0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"},"signature":"0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"}]`
 	expectedPath := "/eth/v1/builder/validators"
 	hc := &http.Client{
 		Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
@@ -111,6 +111,7 @@ func TestClient_RegisterValidator(t *testing.T) {
 			Timestamp:    42,
 			Pubkey:       ezDecode(t, "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"),
 		},
+		Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
 	}
 	require.NoError(t, c.RegisterValidator(ctx, []*eth.SignedValidatorRegistrationV1{reg}))
 }
--- a/api/client/builder/types.go
+++ b/api/client/builder/types.go
@@ -23,8 +23,8 @@ type ValidatorRegistration struct {

 func (r *SignedValidatorRegistration) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Message   *ValidatorRegistration `json:"message,omitempty"`
-		Signature hexutil.Bytes          `json:"signature,omitempty"`
+		Message   *ValidatorRegistration `json:"message"`
+		Signature hexutil.Bytes          `json:"signature"`
 	}{
 		Message:   &ValidatorRegistration{r.Message},
 		Signature: r.SignedValidatorRegistrationV1.Signature,
@@ -36,8 +36,8 @@ func (r *SignedValidatorRegistration) UnmarshalJSON(b []byte) error {
 		r.SignedValidatorRegistrationV1 = &eth.SignedValidatorRegistrationV1{}
 	}
 	o := struct {
-		Message   *ValidatorRegistration `json:"message,omitempty"`
-		Signature hexutil.Bytes          `json:"signature,omitempty"`
+		Message   *ValidatorRegistration `json:"message"`
+		Signature hexutil.Bytes          `json:"signature"`
 	}{}
 	if err := json.Unmarshal(b, &o); err != nil {
 		return err
@@ -49,10 +49,10 @@ func (r *SignedValidatorRegistration) UnmarshalJSON(b []byte) error {

 func (r *ValidatorRegistration) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		FeeRecipient hexutil.Bytes `json:"fee_recipient,omitempty"`
-		GasLimit     string        `json:"gas_limit,omitempty"`
-		Timestamp    string        `json:"timestamp,omitempty"`
-		Pubkey       hexutil.Bytes `json:"pubkey,omitempty"`
+		FeeRecipient hexutil.Bytes `json:"fee_recipient"`
+		GasLimit     string        `json:"gas_limit"`
+		Timestamp    string        `json:"timestamp"`
+		Pubkey       hexutil.Bytes `json:"pubkey"`
 	}{
 		FeeRecipient: r.FeeRecipient,
 		GasLimit:     fmt.Sprintf("%d", r.GasLimit),
@@ -66,10 +66,10 @@ func (r *ValidatorRegistration) UnmarshalJSON(b []byte) error {
 		r.ValidatorRegistrationV1 = &eth.ValidatorRegistrationV1{}
 	}
 	o := struct {
-		FeeRecipient hexutil.Bytes `json:"fee_recipient,omitempty"`
-		GasLimit     string        `json:"gas_limit,omitempty"`
-		Timestamp    string        `json:"timestamp,omitempty"`
-		Pubkey       hexutil.Bytes `json:"pubkey,omitempty"`
+		FeeRecipient hexutil.Bytes `json:"fee_recipient"`
+		GasLimit     string        `json:"gas_limit"`
+		Timestamp    string        `json:"timestamp"`
+		Pubkey       hexutil.Bytes `json:"pubkey"`
 	}{}
 	if err := json.Unmarshal(b, &o); err != nil {
 		return err
@@ -110,8 +110,7 @@ func stringToUint256(s string) (Uint256, error) {

 // sszBytesToUint256 creates a Uint256 from a ssz-style (little-endian byte slice) representation.
 func sszBytesToUint256(b []byte) (Uint256, error) {
-	bi := new(big.Int)
-	bi.SetBytes(bytesutil.ReverseByteOrder(b))
+	bi := bytesutil.LittleEndianBytesToBigInt(b)
 	if !isValidUint256(bi) {
 		return Uint256{}, errors.Wrapf(errDecodeUint256, "value=%s", b)
 	}
@@ -183,11 +182,11 @@ func (s Uint64String) MarshalText() ([]byte, error) {
 }

 type ExecHeaderResponse struct {
-	Version string `json:"version,omitempty"`
+	Version string `json:"version"`
 	Data    struct {
-		Signature hexutil.Bytes `json:"signature,omitempty"`
-		Message   *BuilderBid   `json:"message,omitempty"`
-	} `json:"data,omitempty"`
+		Signature hexutil.Bytes `json:"signature"`
+		Message   *BuilderBid   `json:"message"`
+	} `json:"data"`
 }

 func (ehr *ExecHeaderResponse) ToProto() (*eth.SignedBuilderBid, error) {
@@ -233,26 +232,26 @@ func (h *ExecutionPayloadHeader) ToProto() (*v1.ExecutionPayloadHeader, error) {
 }

 type BuilderBid struct {
-	Header *ExecutionPayloadHeader `json:"header,omitempty"`
-	Value  Uint256                 `json:"value,omitempty"`
-	Pubkey hexutil.Bytes           `json:"pubkey,omitempty"`
+	Header *ExecutionPayloadHeader `json:"header"`
+	Value  Uint256                 `json:"value"`
+	Pubkey hexutil.Bytes           `json:"pubkey"`
 }

 type ExecutionPayloadHeader struct {
-	ParentHash       hexutil.Bytes `json:"parent_hash,omitempty"`
-	FeeRecipient     hexutil.Bytes `json:"fee_recipient,omitempty"`
-	StateRoot        hexutil.Bytes `json:"state_root,omitempty"`
-	ReceiptsRoot     hexutil.Bytes `json:"receipts_root,omitempty"`
-	LogsBloom        hexutil.Bytes `json:"logs_bloom,omitempty"`
-	PrevRandao       hexutil.Bytes `json:"prev_randao,omitempty"`
-	BlockNumber      Uint64String  `json:"block_number,omitempty"`
-	GasLimit         Uint64String  `json:"gas_limit,omitempty"`
-	GasUsed          Uint64String  `json:"gas_used,omitempty"`
-	Timestamp        Uint64String  `json:"timestamp,omitempty"`
-	ExtraData        hexutil.Bytes `json:"extra_data,omitempty"`
-	BaseFeePerGas    Uint256       `json:"base_fee_per_gas,omitempty"`
-	BlockHash        hexutil.Bytes `json:"block_hash,omitempty"`
-	TransactionsRoot hexutil.Bytes `json:"transactions_root,omitempty"`
+	ParentHash       hexutil.Bytes `json:"parent_hash"`
+	FeeRecipient     hexutil.Bytes `json:"fee_recipient"`
+	StateRoot        hexutil.Bytes `json:"state_root"`
+	ReceiptsRoot     hexutil.Bytes `json:"receipts_root"`
+	LogsBloom        hexutil.Bytes `json:"logs_bloom"`
+	PrevRandao       hexutil.Bytes `json:"prev_randao"`
+	BlockNumber      Uint64String  `json:"block_number"`
+	GasLimit         Uint64String  `json:"gas_limit"`
+	GasUsed          Uint64String  `json:"gas_used"`
+	Timestamp        Uint64String  `json:"timestamp"`
+	ExtraData        hexutil.Bytes `json:"extra_data"`
+	BaseFeePerGas    Uint256       `json:"base_fee_per_gas"`
+	BlockHash        hexutil.Bytes `json:"block_hash"`
+	TransactionsRoot hexutil.Bytes `json:"transactions_root"`
 	*v1.ExecutionPayloadHeader
 }

@@ -294,25 +293,25 @@ func (h *ExecutionPayloadHeader) UnmarshalJSON(b []byte) error {
 }

 type ExecPayloadResponse struct {
-	Version string           `json:"version,omitempty"`
-	Data    ExecutionPayload `json:"data,omitempty"`
+	Version string           `json:"version"`
+	Data    ExecutionPayload `json:"data"`
 }

 type ExecutionPayload struct {
-	ParentHash    hexutil.Bytes   `json:"parent_hash,omitempty"`
-	FeeRecipient  hexutil.Bytes   `json:"fee_recipient,omitempty"`
-	StateRoot     hexutil.Bytes   `json:"state_root,omitempty"`
-	ReceiptsRoot  hexutil.Bytes   `json:"receipts_root,omitempty"`
-	LogsBloom     hexutil.Bytes   `json:"logs_bloom,omitempty"`
-	PrevRandao    hexutil.Bytes   `json:"prev_randao,omitempty"`
-	BlockNumber   Uint64String    `json:"block_number,omitempty"`
-	GasLimit      Uint64String    `json:"gas_limit,omitempty"`
-	GasUsed       Uint64String    `json:"gas_used,omitempty"`
-	Timestamp     Uint64String    `json:"timestamp,omitempty"`
-	ExtraData     hexutil.Bytes   `json:"extra_data,omitempty"`
-	BaseFeePerGas Uint256         `json:"base_fee_per_gas,omitempty"`
-	BlockHash     hexutil.Bytes   `json:"block_hash,omitempty"`
-	Transactions  []hexutil.Bytes `json:"transactions,omitempty"`
+	ParentHash    hexutil.Bytes   `json:"parent_hash"`
+	FeeRecipient  hexutil.Bytes   `json:"fee_recipient"`
+	StateRoot     hexutil.Bytes   `json:"state_root"`
+	ReceiptsRoot  hexutil.Bytes   `json:"receipts_root"`
+	LogsBloom     hexutil.Bytes   `json:"logs_bloom"`
+	PrevRandao    hexutil.Bytes   `json:"prev_randao"`
+	BlockNumber   Uint64String    `json:"block_number"`
+	GasLimit      Uint64String    `json:"gas_limit"`
+	GasUsed       Uint64String    `json:"gas_used"`
+	Timestamp     Uint64String    `json:"timestamp"`
+	ExtraData     hexutil.Bytes   `json:"extra_data"`
+	BaseFeePerGas Uint256         `json:"base_fee_per_gas"`
+	BlockHash     hexutil.Bytes   `json:"block_hash"`
+	Transactions  []hexutil.Bytes `json:"transactions"`
 }

 func (r *ExecPayloadResponse) ToProto() (*v1.ExecutionPayload, error) {
@@ -356,8 +355,8 @@ type BlindedBeaconBlockBodyBellatrix struct {

 func (r *SignedBlindedBeaconBlockBellatrix) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Message   *BlindedBeaconBlockBellatrix `json:"message,omitempty"`
-		Signature hexutil.Bytes                `json:"signature,omitempty"`
+		Message   *BlindedBeaconBlockBellatrix `json:"message"`
+		Signature hexutil.Bytes                `json:"signature"`
 	}{
 		Message:   &BlindedBeaconBlockBellatrix{r.SignedBlindedBeaconBlockBellatrix.Block},
 		Signature: r.SignedBlindedBeaconBlockBellatrix.Signature,
@@ -367,10 +366,10 @@ func (r *SignedBlindedBeaconBlockBellatrix) MarshalJSON() ([]byte, error) {
 func (b *BlindedBeaconBlockBellatrix) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Slot          string                           `json:"slot"`
-		ProposerIndex string                           `json:"proposer_index,omitempty"`
-		ParentRoot    hexutil.Bytes                    `json:"parent_root,omitempty"`
-		StateRoot     hexutil.Bytes                    `json:"state_root,omitempty"`
-		Body          *BlindedBeaconBlockBodyBellatrix `json:"body,omitempty"`
+		ProposerIndex string                           `json:"proposer_index"`
+		ParentRoot    hexutil.Bytes                    `json:"parent_root"`
+		StateRoot     hexutil.Bytes                    `json:"state_root"`
+		Body          *BlindedBeaconBlockBodyBellatrix `json:"body"`
 	}{
 		Slot:          fmt.Sprintf("%d", b.Slot),
 		ProposerIndex: fmt.Sprintf("%d", b.ProposerIndex),
@@ -386,8 +385,8 @@ type ProposerSlashing struct {

 func (s *ProposerSlashing) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		SignedHeader1 *SignedBeaconBlockHeader `json:"signed_header_1,omitempty"`
-		SignedHeader2 *SignedBeaconBlockHeader `json:"signed_header_2,omitempty"`
+		SignedHeader1 *SignedBeaconBlockHeader `json:"signed_header_1"`
+		SignedHeader2 *SignedBeaconBlockHeader `json:"signed_header_2"`
 	}{
 		SignedHeader1: &SignedBeaconBlockHeader{s.ProposerSlashing.Header_1},
 		SignedHeader2: &SignedBeaconBlockHeader{s.ProposerSlashing.Header_2},
@@ -400,8 +399,8 @@ type SignedBeaconBlockHeader struct {

 func (h *SignedBeaconBlockHeader) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Header    *BeaconBlockHeader `json:"message,omitempty"`
-		Signature hexutil.Bytes      `json:"signature,omitempty"`
+		Header    *BeaconBlockHeader `json:"message"`
+		Signature hexutil.Bytes      `json:"signature"`
 	}{
 		Header:    &BeaconBlockHeader{h.SignedBeaconBlockHeader.Header},
 		Signature: h.SignedBeaconBlockHeader.Signature,
@@ -414,11 +413,11 @@ type BeaconBlockHeader struct {

 func (h *BeaconBlockHeader) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Slot          string        `json:"slot,omitempty"`
-		ProposerIndex string        `json:"proposer_index,omitempty"`
-		ParentRoot    hexutil.Bytes `json:"parent_root,omitempty"`
-		StateRoot     hexutil.Bytes `json:"state_root,omitempty"`
-		BodyRoot      hexutil.Bytes `json:"body_root,omitempty"`
+		Slot          string        `json:"slot"`
+		ProposerIndex string        `json:"proposer_index"`
+		ParentRoot    hexutil.Bytes `json:"parent_root"`
+		StateRoot     hexutil.Bytes `json:"state_root"`
+		BodyRoot      hexutil.Bytes `json:"body_root"`
 	}{
 		Slot:          fmt.Sprintf("%d", h.BeaconBlockHeader.Slot),
 		ProposerIndex: fmt.Sprintf("%d", h.BeaconBlockHeader.ProposerIndex),
@@ -438,9 +437,9 @@ func (a *IndexedAttestation) MarshalJSON() ([]byte, error) {
 		indices[i] = fmt.Sprintf("%d", a.AttestingIndices[i])
 	}
 	return json.Marshal(struct {
-		AttestingIndices []string         `json:"attesting_indices,omitempty"`
-		Data             *AttestationData `json:"data,omitempty"`
-		Signature        hexutil.Bytes    `json:"signature,omitempty"`
+		AttestingIndices []string         `json:"attesting_indices"`
+		Data             *AttestationData `json:"data"`
+		Signature        hexutil.Bytes    `json:"signature"`
 	}{
 		AttestingIndices: indices,
 		Data:             &AttestationData{a.IndexedAttestation.Data},
@@ -454,8 +453,8 @@ type AttesterSlashing struct {

 func (s *AttesterSlashing) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Attestation1 *IndexedAttestation `json:"attestation_1,omitempty"`
-		Attestation2 *IndexedAttestation `json:"attestation_2,omitempty"`
+		Attestation1 *IndexedAttestation `json:"attestation_1"`
+		Attestation2 *IndexedAttestation `json:"attestation_2"`
 	}{
 		Attestation1: &IndexedAttestation{s.Attestation_1},
 		Attestation2: &IndexedAttestation{s.Attestation_2},
@@ -468,8 +467,8 @@ type Checkpoint struct {

 func (c *Checkpoint) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Epoch string        `json:"epoch,omitempty"`
-		Root  hexutil.Bytes `json:"root,omitempty"`
+		Epoch string        `json:"epoch"`
+		Root  hexutil.Bytes `json:"root"`
 	}{
 		Epoch: fmt.Sprintf("%d", c.Checkpoint.Epoch),
 		Root:  c.Checkpoint.Root,
@@ -482,11 +481,11 @@ type AttestationData struct {

 func (a *AttestationData) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Slot            string        `json:"slot,omitempty"`
-		Index           string        `json:"index,omitempty"`
-		BeaconBlockRoot hexutil.Bytes `json:"beacon_block_root,omitempty"`
-		Source          *Checkpoint   `json:"source,omitempty"`
-		Target          *Checkpoint   `json:"target,omitempty"`
+		Slot            string        `json:"slot"`
+		Index           string        `json:"index"`
+		BeaconBlockRoot hexutil.Bytes `json:"beacon_block_root"`
+		Source          *Checkpoint   `json:"source"`
+		Target          *Checkpoint   `json:"target"`
 	}{
 		Slot:            fmt.Sprintf("%d", a.AttestationData.Slot),
 		Index:           fmt.Sprintf("%d", a.AttestationData.CommitteeIndex),
@@ -502,9 +501,9 @@ type Attestation struct {

 func (a *Attestation) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		AggregationBits hexutil.Bytes    `json:"aggregation_bits,omitempty"`
-		Data            *AttestationData `json:"data,omitempty"`
-		Signature       hexutil.Bytes    `json:"signature,omitempty" ssz-size:"96"`
+		AggregationBits hexutil.Bytes    `json:"aggregation_bits"`
+		Data            *AttestationData `json:"data"`
+		Signature       hexutil.Bytes    `json:"signature" ssz-size:"96"`
 	}{
 		AggregationBits: hexutil.Bytes(a.Attestation.AggregationBits),
 		Data:            &AttestationData{a.Attestation.Data},
@@ -518,10 +517,10 @@ type DepositData struct {

 func (d *DepositData) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		PublicKey             hexutil.Bytes `json:"pubkey,omitempty"`
-		WithdrawalCredentials hexutil.Bytes `json:"withdrawal_credentials,omitempty"`
-		Amount                string        `json:"amount,omitempty"`
-		Signature             hexutil.Bytes `json:"signature,omitempty"`
+		PublicKey             hexutil.Bytes `json:"pubkey"`
+		WithdrawalCredentials hexutil.Bytes `json:"withdrawal_credentials"`
+		Amount                string        `json:"amount"`
+		Signature             hexutil.Bytes `json:"signature"`
 	}{
 		PublicKey:             d.PublicKey,
 		WithdrawalCredentials: d.WithdrawalCredentials,
@@ -554,8 +553,8 @@ type SignedVoluntaryExit struct {

 func (sve *SignedVoluntaryExit) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Message   *VoluntaryExit `json:"message,omitempty"`
-		Signature hexutil.Bytes  `json:"signature,omitempty"`
+		Message   *VoluntaryExit `json:"message"`
+		Signature hexutil.Bytes  `json:"signature"`
 	}{
 		Signature: sve.SignedVoluntaryExit.Signature,
 		Message:   &VoluntaryExit{sve.SignedVoluntaryExit.Exit},
@@ -568,8 +567,8 @@ type VoluntaryExit struct {

 func (ve *VoluntaryExit) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Epoch          string `json:"epoch,omitempty"`
-		ValidatorIndex string `json:"validator_index,omitempty"`
+		Epoch          string `json:"epoch"`
+		ValidatorIndex string `json:"validator_index"`
 	}{
 		Epoch:          fmt.Sprintf("%d", ve.Epoch),
 		ValidatorIndex: fmt.Sprintf("%d", ve.ValidatorIndex),
@@ -582,8 +581,8 @@ type SyncAggregate struct {

 func (s *SyncAggregate) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		SyncCommitteeBits      hexutil.Bytes `json:"sync_committee_bits,omitempty"`
-		SyncCommitteeSignature hexutil.Bytes `json:"sync_committee_signature,omitempty"`
+		SyncCommitteeBits      hexutil.Bytes `json:"sync_committee_bits"`
+		SyncCommitteeSignature hexutil.Bytes `json:"sync_committee_signature"`
 	}{
 		SyncCommitteeBits:      hexutil.Bytes(s.SyncAggregate.SyncCommitteeBits),
 		SyncCommitteeSignature: s.SyncAggregate.SyncCommitteeSignature,
@@ -596,9 +595,9 @@ type Eth1Data struct {

 func (e *Eth1Data) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		DepositRoot  hexutil.Bytes `json:"deposit_root,omitempty"`
-		DepositCount string        `json:"deposit_count,omitempty"`
-		BlockHash    hexutil.Bytes `json:"block_hash,omitempty"`
+		DepositRoot  hexutil.Bytes `json:"deposit_root"`
+		DepositCount string        `json:"deposit_count"`
+		BlockHash    hexutil.Bytes `json:"block_hash"`
 	}{
 		DepositRoot:  e.DepositRoot,
 		DepositCount: fmt.Sprintf("%d", e.DepositCount),
@@ -628,16 +627,16 @@ func (b *BlindedBeaconBlockBodyBellatrix) MarshalJSON() ([]byte, error) {
 		pros[i] = &ProposerSlashing{ProposerSlashing: b.BlindedBeaconBlockBodyBellatrix.ProposerSlashings[i]}
 	}
 	return json.Marshal(struct {
-		RandaoReveal           hexutil.Bytes           `json:"randao_reveal,omitempty"`
-		Eth1Data               *Eth1Data               `json:"eth1_data,omitempty"`
-		Graffiti               hexutil.Bytes           `json:"graffiti,omitempty"`
-		ProposerSlashings      []*ProposerSlashing     `json:"proposer_slashings,omitempty"`
-		AttesterSlashings      []*AttesterSlashing     `json:"attester_slashings,omitempty"`
-		Attestations           []*Attestation          `json:"attestations,omitempty"`
-		Deposits               []*Deposit              `json:"deposits,omitempty"`
-		VoluntaryExits         []*SignedVoluntaryExit  `json:"voluntary_exits,omitempty"`
-		SyncAggregate          *SyncAggregate          `json:"sync_aggregate,omitempty"`
-		ExecutionPayloadHeader *ExecutionPayloadHeader `json:"execution_payload_header,omitempty"`
+		RandaoReveal           hexutil.Bytes           `json:"randao_reveal"`
+		Eth1Data               *Eth1Data               `json:"eth1_data"`
+		Graffiti               hexutil.Bytes           `json:"graffiti"`
+		ProposerSlashings      []*ProposerSlashing     `json:"proposer_slashings"`
+		AttesterSlashings      []*AttesterSlashing     `json:"attester_slashings"`
+		Attestations           []*Attestation          `json:"attestations"`
+		Deposits               []*Deposit              `json:"deposits"`
+		VoluntaryExits         []*SignedVoluntaryExit  `json:"voluntary_exits"`
+		SyncAggregate          *SyncAggregate          `json:"sync_aggregate"`
+		ExecutionPayloadHeader *ExecutionPayloadHeader `json:"execution_payload_header"`
 	}{
 		RandaoReveal:           b.RandaoReveal,
 		Eth1Data:               &Eth1Data{b.BlindedBeaconBlockBodyBellatrix.Eth1Data},
--- a/async/multilock.go
+++ b/async/multilock.go
@@ -3,7 +3,9 @@ Copyright 2017 Albert Tedja
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
-    http://www.apache.org/licenses/LICENSE-2.0
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
--- a/async/multilock_test.go
+++ b/async/multilock_test.go
@@ -3,7 +3,9 @@ Copyright 2017 Albert Tedja
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
-    http://www.apache.org/licenses/LICENSE-2.0
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
--- a/beacon-chain/blockchain/BUILD.bazel
+++ b/beacon-chain/blockchain/BUILD.bazel
@@ -45,6 +45,7 @@ go_library(
        "//beacon-chain/core/signing:go_default_library",
        "//beacon-chain/core/time:go_default_library",
        "//beacon-chain/core/transition:go_default_library",
+        "//beacon-chain/core/transition/interop:go_default_library",
        "//beacon-chain/db:go_default_library",
        "//beacon-chain/db/filters:go_default_library",
        "//beacon-chain/db/kv:go_default_library",
@@ -53,6 +54,7 @@ go_library(
        "//beacon-chain/forkchoice/doubly-linked-tree:go_default_library",
        "//beacon-chain/forkchoice/types:go_default_library",
        "//beacon-chain/operations/attestations:go_default_library",
+        "//beacon-chain/operations/blstoexec:go_default_library",
        "//beacon-chain/operations/slashings:go_default_library",
        "//beacon-chain/operations/voluntaryexits:go_default_library",
        "//beacon-chain/p2p:go_default_library",
@@ -63,6 +65,7 @@ go_library(
        "//config/params:go_default_library",
        "//consensus-types/blocks:go_default_library",
        "//consensus-types/interfaces:go_default_library",
+        "//consensus-types/payload-attribute:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//crypto/bls:go_default_library",
        "//encoding/bytesutil:go_default_library",
--- a/beacon-chain/blockchain/chain_info.go
+++ b/beacon-chain/blockchain/chain_info.go
@@ -328,6 +328,11 @@ func (s *Service) IsFinalized(ctx context.Context, root [32]byte) bool {
 	if s.ForkChoicer().FinalizedCheckpoint().Root == root {
 		return true
 	}
+	// If node exists in our store, then it is not
+	// finalized.
+	if s.ForkChoicer().HasNode(root) {
+		return false
+	}
 	return s.cfg.BeaconDB.IsFinalizedBlock(ctx, root)
 }

--- a/beacon-chain/blockchain/chain_info_test.go
+++ b/beacon-chain/blockchain/chain_info_test.go
@@ -125,7 +125,10 @@ func TestHeadSlot_CanRetrieve(t *testing.T) {
 	c := &Service{}
 	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{})
 	require.NoError(t, err)
-	c.head = &head{slot: 100, state: s}
+	b, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
+	require.NoError(t, err)
+	b.Block().SetSlot(100)
+	c.head = &head{block: b, state: s}
 	assert.Equal(t, types.Slot(100), c.HeadSlot())
 }

@@ -304,31 +307,6 @@ func TestService_HeadGenesisValidatorsRoot(t *testing.T) {
 	root = c.HeadGenesisValidatorsRoot()
 	require.DeepEqual(t, root[:], s.GenesisValidatorsRoot())
 }
-func TestService_ChainHeads_ProtoArray(t *testing.T) {
-	ctx := context.Background()
-	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}}
-	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	st, blkRoot, err := prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
-	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	st, blkRoot, err = prepareForkchoiceState(ctx, 101, [32]byte{'b'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, ojc, ofc)
-	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	st, blkRoot, err = prepareForkchoiceState(ctx, 102, [32]byte{'c'}, [32]byte{'b'}, params.BeaconConfig().ZeroHash, ojc, ofc)
-	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	st, blkRoot, err = prepareForkchoiceState(ctx, 103, [32]byte{'d'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, ojc, ofc)
-	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	st, blkRoot, err = prepareForkchoiceState(ctx, 104, [32]byte{'e'}, [32]byte{'b'}, params.BeaconConfig().ZeroHash, ojc, ofc)
-	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-
-	roots, slots := c.ChainHeads()
-	require.DeepEqual(t, [][32]byte{{'c'}, {'d'}, {'e'}}, roots)
-	require.DeepEqual(t, []types.Slot{102, 103, 104}, slots)
-}

 //
 //  A <- B <- C
@@ -353,7 +331,7 @@ func TestService_ChainHeads(t *testing.T) {
 	st, blkRoot, err = prepareForkchoiceState(ctx, 102, [32]byte{'c'}, [32]byte{'b'}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	st, blkRoot, err = prepareForkchoiceState(ctx, 103, [32]byte{'d'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	st, blkRoot, err = prepareForkchoiceState(ctx, 103, [32]byte{'d'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 	st, blkRoot, err = prepareForkchoiceState(ctx, 104, [32]byte{'e'}, [32]byte{'b'}, params.BeaconConfig().ZeroHash, ojc, ofc)
@@ -437,7 +415,7 @@ func TestService_IsOptimistic(t *testing.T) {
 	ctx := context.Background()
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{slot: 101, root: [32]byte{'b'}}}
+	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{root: [32]byte{'b'}}}
 	st, blkRoot, err := prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
@@ -460,7 +438,7 @@ func TestService_IsOptimisticBeforeBellatrix(t *testing.T) {

 func TestService_IsOptimisticForRoot(t *testing.T) {
 	ctx := context.Background()
-	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{slot: 101, root: [32]byte{'b'}}}
+	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{root: [32]byte{'b'}}}
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	st, blkRoot, err := prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
@@ -478,7 +456,7 @@ func TestService_IsOptimisticForRoot(t *testing.T) {
 func TestService_IsOptimisticForRoot_DB(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	ctx := context.Background()
-	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: doublylinkedtree.New()}, head: &head{slot: 101, root: [32]byte{'b'}}}
+	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: doublylinkedtree.New()}, head: &head{root: [32]byte{'b'}}}
 	c.head = &head{root: params.BeaconConfig().ZeroHash}
 	b := util.NewBeaconBlock()
 	b.Block.Slot = 10
@@ -536,7 +514,7 @@ func TestService_IsOptimisticForRoot_DB(t *testing.T) {
 func TestService_IsOptimisticForRoot_DB_non_canonical(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	ctx := context.Background()
-	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: doublylinkedtree.New()}, head: &head{slot: 101, root: [32]byte{'b'}}}
+	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: doublylinkedtree.New()}, head: &head{root: [32]byte{'b'}}}
 	c.head = &head{root: params.BeaconConfig().ZeroHash}
 	b := util.NewBeaconBlock()
 	b.Block.Slot = 10
--- a/beacon-chain/blockchain/error.go
+++ b/beacon-chain/blockchain/error.go
@@ -8,19 +8,17 @@ var (
 	// ErrInvalidBlockHashPayloadStatus is returned when the payload has invalid block hash.
 	ErrInvalidBlockHashPayloadStatus = invalidBlock{error: errors.New("received an INVALID_BLOCK_HASH payload from execution engine")}
 	// ErrUndefinedExecutionEngineError is returned when the execution engine returns an error that is not defined
-	ErrUndefinedExecutionEngineError = errors.New("received an undefined ee error")
+	ErrUndefinedExecutionEngineError = errors.New("received an undefined execution engine error")
 	// errNilFinalizedInStore is returned when a nil finalized checkpt is returned from store.
 	errNilFinalizedInStore = errors.New("nil finalized checkpoint returned from store")
 	// errNilFinalizedCheckpoint is returned when a nil finalized checkpt is returned from a state.
 	errNilFinalizedCheckpoint = errors.New("nil finalized checkpoint returned from state")
 	// errNilJustifiedCheckpoint is returned when a nil justified checkpt is returned from a state.
-	errNilJustifiedCheckpoint = errors.New("nil finalized checkpoint returned from state")
+	errNilJustifiedCheckpoint = errors.New("nil justified checkpoint returned from state")
 	// errInvalidNilSummary is returned when a nil summary is returned from the DB.
 	errInvalidNilSummary = errors.New("nil summary returned from the DB")
 	// errWrongBlockCount is returned when the wrong number of blocks or block roots is used
 	errWrongBlockCount = errors.New("wrong number of blocks or block roots")
-	// block is not a valid optimistic candidate block
-	errNotOptimisticCandidate = errors.New("block is not suitable for optimistic sync")
 	// errBlockNotFoundInCacheOrDB is returned when a block is not found in the cache or DB.
 	errBlockNotFoundInCacheOrDB = errors.New("block not found in cache or db")
 	// errNilStateFromStategen is returned when a nil state is returned from the state generator.
--- a/beacon-chain/blockchain/execution_engine.go
+++ b/beacon-chain/blockchain/execution_engine.go
@@ -15,9 +15,11 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	consensusblocks "github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
+	payloadattribute "github.com/prysmaticlabs/prysm/v3/consensus-types/payload-attribute"
 	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	enginev1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
+	"github.com/prysmaticlabs/prysm/v3/runtime/version"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
 	"github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
@@ -67,11 +69,7 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 	}

 	nextSlot := s.CurrentSlot() + 1 // Cache payload ID for next slot proposer.
-	hasAttr, attr, proposerId, err := s.getPayloadAttribute(ctx, arg.headState, nextSlot)
-	if err != nil {
-		log.WithError(err).Error("Could not get head payload attribute")
-		return nil, nil
-	}
+	hasAttr, attr, proposerId := s.getPayloadAttribute(ctx, arg.headState, nextSlot)

 	payloadID, lastValidHash, err := s.cfg.ExecutionEngineCaller.ForkchoiceUpdated(ctx, fcs, attr)
 	if err != nil {
@@ -150,7 +148,8 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 		log.WithError(err).Error("Could not set head root to valid")
 		return nil, nil
 	}
-	if hasAttr && payloadID != nil { // If the forkchoice update call has an attribute, update the proposer payload ID cache.
+	// If the forkchoice update call has an attribute, update the proposer payload ID cache.
+	if hasAttr && payloadID != nil {
 		var pId [8]byte
 		copy(pId[:], payloadID[:])
 		s.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(nextSlot, proposerId, pId, arg.headRoot)
@@ -180,7 +179,7 @@ func (s *Service) getPayloadHash(ctx context.Context, root []byte) ([32]byte, er
 	return bytesutil.ToBytes32(payload.BlockHash()), nil
 }

-// notifyForkchoiceUpdate signals execution engine on a new payload.
+// notifyNewPayload signals execution engine on a new payload.
 // It returns true if the EL has returned VALID for the block
 func (s *Service) notifyNewPayload(ctx context.Context, postStateVersion int,
 	postStateHeader interfaces.ExecutionData, blk interfaces.SignedBeaconBlock) (bool, error) {
@@ -251,22 +250,25 @@ func (s *Service) notifyNewPayload(ctx context.Context, postStateVersion int,

 // getPayloadAttributes returns the payload attributes for the given state and slot.
 // The attribute is required to initiate a payload build process in the context of an `engine_forkchoiceUpdated` call.
-func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState, slot types.Slot) (bool, *enginev1.PayloadAttributes, types.ValidatorIndex, error) {
+func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState, slot types.Slot) (bool, payloadattribute.Attributer, types.ValidatorIndex) {
+	emptyAttri := payloadattribute.EmptyWithVersion(st.Version())
 	// Root is `[32]byte{}` since we are retrieving proposer ID of a given slot. During insertion at assignment the root was not known.
 	proposerID, _, ok := s.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(slot, [32]byte{} /* root */)
 	if !ok { // There's no need to build attribute if there is no proposer for slot.
-		return false, nil, 0, nil
+		return false, emptyAttri, 0
 	}

 	// Get previous randao.
 	st = st.Copy()
 	st, err := transition.ProcessSlotsIfPossible(ctx, st, slot)
 	if err != nil {
-		return false, nil, 0, err
+		log.WithError(err).Error("Could not process slots to get payload attribute")
+		return false, emptyAttri, 0
 	}
 	prevRando, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
 	if err != nil {
-		return false, nil, 0, nil
+		log.WithError(err).Error("Could not get randao mix to get payload attribute")
+		return false, emptyAttri, 0
 	}

 	// Get fee recipient.
@@ -284,7 +286,8 @@ func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState,
 				"Please refer to our documentation for instructions")
 		}
 	case err != nil:
-		return false, nil, 0, errors.Wrap(err, "could not get fee recipient in db")
+		log.WithError(err).Error("Could not get fee recipient to get payload attribute")
+		return false, emptyAttri, 0
 	default:
 		feeRecipient = recipient
 	}
@@ -292,14 +295,44 @@ func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState,
 	// Get timestamp.
 	t, err := slots.ToTime(uint64(s.genesisTime.Unix()), slot)
 	if err != nil {
-		return false, nil, 0, err
+		log.WithError(err).Error("Could not get timestamp to get payload attribute")
+		return false, emptyAttri, 0
 	}
-	attr := &enginev1.PayloadAttributes{
-		Timestamp:             uint64(t.Unix()),
-		PrevRandao:            prevRando,
-		SuggestedFeeRecipient: feeRecipient.Bytes(),
+
+	var attr payloadattribute.Attributer
+	switch st.Version() {
+	case version.Capella, version.Deneb:
+		withdrawals, err := st.ExpectedWithdrawals()
+		if err != nil {
+			log.WithError(err).Error("Could not get expected withdrawals to get payload attribute")
+			return false, emptyAttri, 0
+		}
+		attr, err = payloadattribute.New(&enginev1.PayloadAttributesV2{
+			Timestamp:             uint64(t.Unix()),
+			PrevRandao:            prevRando,
+			SuggestedFeeRecipient: feeRecipient.Bytes(),
+			Withdrawals:           withdrawals,
+		})
+		if err != nil {
+			log.WithError(err).Error("Could not get payload attribute")
+			return false, emptyAttri, 0
+		}
+	case version.Bellatrix:
+		attr, err = payloadattribute.New(&enginev1.PayloadAttributes{
+			Timestamp:             uint64(t.Unix()),
+			PrevRandao:            prevRando,
+			SuggestedFeeRecipient: feeRecipient.Bytes(),
+		})
+		if err != nil {
+			log.WithError(err).Error("Could not get payload attribute")
+			return false, emptyAttri, 0
+		}
+	default:
+		log.WithField("version", st.Version()).Error("Could not get payload attribute due to unknown state version")
+		return false, emptyAttri, 0
 	}
-	return true, attr, proposerID, nil
+
+	return true, attr, proposerID
 }

 // removeInvalidBlockAndState removes the invalid block and its corresponding state from the cache and DB.
--- a/beacon-chain/blockchain/execution_engine_test.go
+++ b/beacon-chain/blockchain/execution_engine_test.go
@@ -15,6 +15,7 @@ import (
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/doubly-linked-tree"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/types"
 	bstate "github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
+	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
@@ -30,6 +31,69 @@ import (
 	logTest "github.com/sirupsen/logrus/hooks/test"
 )

+func Test_NotifyForkchoiceUpdate_GetPayloadAttrErrorCanContinue(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+	altairBlk := util.SaveBlock(t, ctx, beaconDB, util.NewBeaconBlockAltair())
+	altairBlkRoot, err := altairBlk.Block().HashTreeRoot()
+	require.NoError(t, err)
+	bellatrixBlk := util.SaveBlock(t, ctx, beaconDB, util.NewBeaconBlockBellatrix())
+	bellatrixBlkRoot, err := bellatrixBlk.Block().HashTreeRoot()
+	require.NoError(t, err)
+	fcs := doublylinkedtree.New()
+	opts := []Option{
+		WithDatabase(beaconDB),
+		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithForkChoiceStore(fcs),
+		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
+	}
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+	st, _ := util.DeterministicGenesisState(t, 10)
+	service.head = &head{
+		state: st,
+	}
+
+	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+
+	b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlockBellatrix{
+		Body: &ethpb.BeaconBlockBodyBellatrix{
+			ExecutionPayload: &v1.ExecutionPayload{},
+		},
+	})
+	require.NoError(t, err)
+
+	pid := &v1.PayloadIDBytes{1}
+	service.cfg.ExecutionEngineCaller = &mockExecution.EngineClient{PayloadIDBytes: pid}
+	st, _ = util.DeterministicGenesisState(t, 1)
+	require.NoError(t, beaconDB.SaveState(ctx, st, bellatrixBlkRoot))
+	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, bellatrixBlkRoot))
+
+	// Intentionally generate a bad state such that `hash_tree_root` fails during `process_slot`
+	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{})
+	require.NoError(t, err)
+	arg := &notifyForkchoiceUpdateArg{
+		headState: s,
+		headRoot:  [32]byte{},
+		headBlock: b,
+	}
+
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(1, 0, [8]byte{}, [32]byte{})
+	got, err := service.notifyForkchoiceUpdate(ctx, arg)
+	require.NoError(t, err)
+	require.DeepEqual(t, got, pid) // We still get a payload ID even though the state is bad. This means it returns until the end.
+}
+
 func Test_NotifyForkchoiceUpdate(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
@@ -47,11 +111,12 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
 	}
 	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
 	st, _ := util.DeterministicGenesisState(t, 10)
 	service.head = &head{
 		state: st,
 	}
-	require.NoError(t, err)
+
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
@@ -727,8 +792,8 @@ func Test_GetPayloadAttribute(t *testing.T) {
 	// Cache miss
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	hasPayload, _, vId, err := service.getPayloadAttribute(ctx, nil, 0)
-	require.NoError(t, err)
+	st, _ := util.DeterministicGenesisStateBellatrix(t, 1)
+	hasPayload, _, vId := service.getPayloadAttribute(ctx, st, 0)
 	require.Equal(t, false, hasPayload)
 	require.Equal(t, types.ValidatorIndex(0), vId)

@@ -736,24 +801,65 @@ func Test_GetPayloadAttribute(t *testing.T) {
 	suggestedVid := types.ValidatorIndex(1)
 	slot := types.Slot(1)
 	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{}, [32]byte{})
-	st, _ := util.DeterministicGenesisState(t, 1)
 	hook := logTest.NewGlobal()
-	hasPayload, attr, vId, err := service.getPayloadAttribute(ctx, st, slot)
-	require.NoError(t, err)
+	hasPayload, attr, vId := service.getPayloadAttribute(ctx, st, slot)
 	require.Equal(t, true, hasPayload)
 	require.Equal(t, suggestedVid, vId)
-	require.Equal(t, params.BeaconConfig().EthBurnAddressHex, common.BytesToAddress(attr.SuggestedFeeRecipient).String())
+	require.Equal(t, params.BeaconConfig().EthBurnAddressHex, common.BytesToAddress(attr.SuggestedFeeRecipient()).String())
 	require.LogsContain(t, hook, "Fee recipient is currently using the burn address")

 	// Cache hit, advance state, has fee recipient
 	suggestedAddr := common.HexToAddress("123")
 	require.NoError(t, service.cfg.BeaconDB.SaveFeeRecipientsByValidatorIDs(ctx, []types.ValidatorIndex{suggestedVid}, []common.Address{suggestedAddr}))
 	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{}, [32]byte{})
-	hasPayload, attr, vId, err = service.getPayloadAttribute(ctx, st, slot)
-	require.NoError(t, err)
+	hasPayload, attr, vId = service.getPayloadAttribute(ctx, st, slot)
 	require.Equal(t, true, hasPayload)
 	require.Equal(t, suggestedVid, vId)
-	require.Equal(t, suggestedAddr, common.BytesToAddress(attr.SuggestedFeeRecipient))
+	require.Equal(t, suggestedAddr, common.BytesToAddress(attr.SuggestedFeeRecipient()))
+}
+
+func Test_GetPayloadAttributeV2(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+	opts := []Option{
+		WithDatabase(beaconDB),
+		WithStateGen(stategen.New(beaconDB, doublylinkedtree.New())),
+		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
+	}
+
+	// Cache miss
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+	st, _ := util.DeterministicGenesisStateCapella(t, 1)
+	hasPayload, _, vId := service.getPayloadAttribute(ctx, st, 0)
+	require.Equal(t, false, hasPayload)
+	require.Equal(t, types.ValidatorIndex(0), vId)
+
+	// Cache hit, advance state, no fee recipient
+	suggestedVid := types.ValidatorIndex(1)
+	slot := types.Slot(1)
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{}, [32]byte{})
+	hook := logTest.NewGlobal()
+	hasPayload, attr, vId := service.getPayloadAttribute(ctx, st, slot)
+	require.Equal(t, true, hasPayload)
+	require.Equal(t, suggestedVid, vId)
+	require.Equal(t, params.BeaconConfig().EthBurnAddressHex, common.BytesToAddress(attr.SuggestedFeeRecipient()).String())
+	require.LogsContain(t, hook, "Fee recipient is currently using the burn address")
+	a, err := attr.Withdrawals()
+	require.NoError(t, err)
+	require.Equal(t, 0, len(a))
+
+	// Cache hit, advance state, has fee recipient
+	suggestedAddr := common.HexToAddress("123")
+	require.NoError(t, service.cfg.BeaconDB.SaveFeeRecipientsByValidatorIDs(ctx, []types.ValidatorIndex{suggestedVid}, []common.Address{suggestedAddr}))
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{}, [32]byte{})
+	hasPayload, attr, vId = service.getPayloadAttribute(ctx, st, slot)
+	require.Equal(t, true, hasPayload)
+	require.Equal(t, suggestedVid, vId)
+	require.Equal(t, suggestedAddr, common.BytesToAddress(attr.SuggestedFeeRecipient()))
+	a, err = attr.Withdrawals()
+	require.NoError(t, err)
+	require.Equal(t, 0, len(a))
 }

 func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
@@ -771,7 +877,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	genesisStateRoot := [32]byte{}
+	var genesisStateRoot [32]byte
 	genesisBlk := blocks.NewGenesisBlock(genesisStateRoot[:])
 	util.SaveBlock(t, ctx, beaconDB, genesisBlk)
 	genesisRoot, err := genesisBlk.Block.HashTreeRoot()
--- a/beacon-chain/blockchain/head.go
+++ b/beacon-chain/blockchain/head.go
@@ -19,6 +19,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v3/math"
 	ethpbv1 "github.com/prysmaticlabs/prysm/v3/proto/eth/v1"
+	"github.com/prysmaticlabs/prysm/v3/runtime/version"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
 	"github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
@@ -51,7 +52,6 @@ func (s *Service) UpdateAndSaveHeadWithBalances(ctx context.Context) error {

 // This defines the current chain service's view of head.
 type head struct {
-	slot  types.Slot                   // current head slot.
 	root  [32]byte                     // current head root.
 	block interfaces.SignedBeaconBlock // current head block.
 	state state.BeaconState            // current head state.
@@ -109,11 +109,21 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 		}
 		dis := headSlot + newHeadSlot - 2*forkSlot
 		dep := math.Max(uint64(headSlot-forkSlot), uint64(newHeadSlot-forkSlot))
+		oldWeight, err := s.ForkChoicer().Weight(oldHeadRoot)
+		if err != nil {
+			log.WithField("root", fmt.Sprintf("%#x", oldHeadRoot)).Warn("could not determine node weight")
+		}
+		newWeight, err := s.ForkChoicer().Weight(newHeadRoot)
+		if err != nil {
+			log.WithField("root", fmt.Sprintf("%#x", newHeadRoot)).Warn("could not determine node weight")
+		}
 		log.WithFields(logrus.Fields{
 			"newSlot":            fmt.Sprintf("%d", newHeadSlot),
 			"newRoot":            fmt.Sprintf("%#x", newHeadRoot),
+			"newWeight":          newWeight,
 			"oldSlot":            fmt.Sprintf("%d", headSlot),
 			"oldRoot":            fmt.Sprintf("%#x", oldHeadRoot),
+			"oldWeight":          oldWeight,
 			"commonAncestorRoot": fmt.Sprintf("%#x", commonRoot),
 			"distance":           dis,
 			"depth":              dep,
@@ -139,7 +149,7 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 			},
 		})

-		if err := s.saveOrphanedAtts(ctx, oldHeadRoot, newHeadRoot); err != nil {
+		if err := s.saveOrphanedOperations(ctx, oldHeadRoot, newHeadRoot); err != nil {
 			return err
 		}
 		reorgCount.Inc()
@@ -202,7 +212,6 @@ func (s *Service) setHead(root [32]byte, block interfaces.SignedBeaconBlock, sta
 		return err
 	}
 	s.head = &head{
-		slot:  block.Block().Slot(),
 		root:  root,
 		block: bCp,
 		state: state.Copy(),
@@ -223,7 +232,6 @@ func (s *Service) setHeadInitialSync(root [32]byte, block interfaces.SignedBeaco
 		return err
 	}
 	s.head = &head{
-		slot:  block.Block().Slot(),
 		root:  root,
 		block: bCp,
 		state: state,
@@ -234,7 +242,10 @@ func (s *Service) setHeadInitialSync(root [32]byte, block interfaces.SignedBeaco
 // This returns the head slot.
 // This is a lock free version.
 func (s *Service) headSlot() types.Slot {
-	return s.head.slot
+	if s.head == nil || s.head.block == nil || s.head.block.Block() == nil {
+		return 0
+	}
+	return s.head.block.Block().Slot()
 }

 // This returns the head root.
@@ -347,9 +358,9 @@ func (s *Service) notifyNewHeadEvent(
 	return nil
 }

-// This saves the attestations between `orphanedRoot` and the common ancestor root that is derived using `newHeadRoot`.
+// This saves the Attestations and BLSToExecChanges between `orphanedRoot` and the common ancestor root that is derived using `newHeadRoot`.
 // It also filters out the attestations that is one epoch older as a defense so invalid attestations don't flow into the attestation pool.
-func (s *Service) saveOrphanedAtts(ctx context.Context, orphanedRoot [32]byte, newHeadRoot [32]byte) error {
+func (s *Service) saveOrphanedOperations(ctx context.Context, orphanedRoot [32]byte, newHeadRoot [32]byte) error {
 	commonAncestorRoot, _, err := s.ForkChoicer().CommonAncestor(ctx, newHeadRoot, orphanedRoot)
 	switch {
 	// Exit early if there's no common ancestor and root doesn't exist, there would be nothing to save.
@@ -388,6 +399,15 @@ func (s *Service) saveOrphanedAtts(ctx context.Context, orphanedRoot [32]byte, n
 			}
 			saveOrphanedAttCount.Inc()
 		}
+		if orphanedBlk.Version() >= version.Capella {
+			changes, err := orphanedBlk.Block().Body().BLSToExecutionChanges()
+			if err != nil {
+				return errors.Wrap(err, "could not get BLSToExecutionChanges")
+			}
+			for _, c := range changes {
+				s.cfg.BLSToExecPool.InsertBLSToExecChange(c)
+			}
+		}
 		parentRoot := orphanedBlk.Block().ParentRoot()
 		orphanedRoot = bytesutil.ToBytes32(parentRoot[:])
 	}
--- a/beacon-chain/blockchain/head_test.go
+++ b/beacon-chain/blockchain/head_test.go
@@ -10,6 +10,7 @@ import (
 	mock "github.com/prysmaticlabs/prysm/v3/beacon-chain/blockchain/testing"
 	testDB "github.com/prysmaticlabs/prysm/v3/beacon-chain/db/testing"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/doubly-linked-tree"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/blstoexec"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 	"github.com/prysmaticlabs/prysm/v3/config/features"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
@@ -30,7 +31,7 @@ func TestSaveHead_Same(t *testing.T) {
 	service := setupBeaconChain(t, beaconDB)

 	r := [32]byte{'A'}
-	service.head = &head{slot: 0, root: r}
+	service.head = &head{root: r}
 	b, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
 	require.NoError(t, err)
 	st, _ := util.DeterministicGenesisState(t, 1)
@@ -53,7 +54,6 @@ func TestSaveHead_Different(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	service.head = &head{
-		slot:  0,
 		root:  oldRoot,
 		block: oldBlock,
 	}
@@ -107,7 +107,6 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	service.head = &head{
-		slot:  0,
 		root:  oldRoot,
 		block: oldBlock,
 	}
@@ -285,7 +284,7 @@ func TestSaveOrphanedAtts(t *testing.T) {
 		util.SaveBlock(t, ctx, beaconDB, blk)
 	}

-	require.NoError(t, service.saveOrphanedAtts(ctx, r3, r4))
+	require.NoError(t, service.saveOrphanedOperations(ctx, r3, r4))
 	require.Equal(t, 3, service.cfg.AttPool.AggregatedAttestationCount())
 	wantAtts := []*ethpb.Attestation{
 		blk3.Block.Body.Attestations[0],
@@ -303,31 +302,37 @@ func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
 	service := setupBeaconChain(t, beaconDB)
+	service.cfg.BLSToExecPool = blstoexec.NewPool()
 	service.genesisTime = time.Now().Add(time.Duration(-1*int64(params.BeaconConfig().SlotsPerEpoch+2)*int64(params.BeaconConfig().SecondsPerSlot)) * time.Second)

 	// Chain setup
 	// 0 -- 1 -- 2
 	//  \-4
-	st, keys := util.DeterministicGenesisState(t, 64)
-	blkG, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), 0)
+	st, keys := util.DeterministicGenesisStateCapella(t, 64)
+	blkConfig := util.DefaultBlockGenConfig()
+	blkConfig.NumBLSChanges = 5
+	blkG, err := util.GenerateFullBlockCapella(st, keys, blkConfig, 1)
 	assert.NoError(t, err)
 	util.SaveBlock(t, ctx, service.cfg.BeaconDB, blkG)
 	rG, err := blkG.Block.HashTreeRoot()
 	require.NoError(t, err)

-	blk1, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), 1)
+	blkConfig.NumBLSChanges = 10
+	blk1, err := util.GenerateFullBlockCapella(st, keys, blkConfig, 2)
 	assert.NoError(t, err)
 	blk1.Block.ParentRoot = rG[:]
 	r1, err := blk1.Block.HashTreeRoot()
 	require.NoError(t, err)

-	blk2, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), 2)
+	blkConfig.NumBLSChanges = 15
+	blk2, err := util.GenerateFullBlockCapella(st, keys, blkConfig, 3)
 	assert.NoError(t, err)
 	blk2.Block.ParentRoot = r1[:]
 	r2, err := blk2.Block.HashTreeRoot()
 	require.NoError(t, err)

-	blk4 := util.NewBeaconBlock()
+	blk4 := util.NewBeaconBlockCapella()
+	blkConfig.NumBLSChanges = 0
 	blk4.Block.Slot = 4
 	blk4.Block.ParentRoot = rG[:]
 	r4, err := blk4.Block.HashTreeRoot()
@@ -335,7 +340,7 @@ func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}

-	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk4} {
+	for _, blk := range []*ethpb.SignedBeaconBlockCapella{blkG, blk1, blk2, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
 		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
@@ -344,8 +349,11 @@ func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
 		util.SaveBlock(t, ctx, beaconDB, blk)
 	}

-	require.NoError(t, service.saveOrphanedAtts(ctx, r2, r4))
-	require.Equal(t, 0, service.cfg.AttPool.AggregatedAttestationCount())
+	require.NoError(t, service.saveOrphanedOperations(ctx, r2, r4))
+	require.Equal(t, 1, service.cfg.AttPool.AggregatedAttestationCount())
+	pending, err := service.cfg.BLSToExecPool.PendingBLSToExecChanges()
+	require.NoError(t, err)
+	require.Equal(t, 15, len(pending))
 }

 func TestSaveOrphanedAtts_DoublyLinkedTrie(t *testing.T) {
@@ -404,7 +412,7 @@ func TestSaveOrphanedAtts_DoublyLinkedTrie(t *testing.T) {
 		util.SaveBlock(t, ctx, beaconDB, blk)
 	}

-	require.NoError(t, service.saveOrphanedAtts(ctx, r3, r4))
+	require.NoError(t, service.saveOrphanedOperations(ctx, r3, r4))
 	require.Equal(t, 3, service.cfg.AttPool.AggregatedAttestationCount())
 	wantAtts := []*ethpb.Attestation{
 		blk3.Block.Body.Attestations[0],
@@ -468,7 +476,7 @@ func TestSaveOrphanedAtts_CanFilter_DoublyLinkedTrie(t *testing.T) {
 		util.SaveBlock(t, ctx, beaconDB, blk)
 	}

-	require.NoError(t, service.saveOrphanedAtts(ctx, r2, r4))
+	require.NoError(t, service.saveOrphanedOperations(ctx, r2, r4))
 	require.Equal(t, 0, service.cfg.AttPool.AggregatedAttestationCount())
 }

--- a/beacon-chain/blockchain/log.go
+++ b/beacon-chain/blockchain/log.go
@@ -38,14 +38,14 @@ func logStateTransitionData(b interfaces.BeaconBlock) error {
 	if len(b.Body().VoluntaryExits()) > 0 {
 		log = log.WithField("voluntaryExits", len(b.Body().VoluntaryExits()))
 	}
-	if b.Version() == version.Altair || b.Version() == version.Bellatrix {
+	if b.Version() >= version.Altair {
 		agg, err := b.Body().SyncAggregate()
 		if err != nil {
 			return err
 		}
 		log = log.WithField("syncBitsCount", agg.SyncCommitteeBits.Count())
 	}
-	if b.Version() == version.Bellatrix {
+	if b.Version() >= version.Bellatrix {
 		p, err := b.Body().Execution()
 		if err != nil {
 			return err
@@ -60,7 +60,20 @@ func logStateTransitionData(b interfaces.BeaconBlock) error {
 			log = log.WithField("txCount", len(txs))
 			txsPerSlotCount.Set(float64(len(txs)))
 		}
-
+		if b.Version() == version.Deneb {
+			k, err := b.Body().BlobKzgCommitments()
+			if err != nil {
+				return err
+			}
+			log = log.WithField("blobCount", len(k))
+		}
+	}
+	if b.Version() == version.Deneb {
+		k, err := b.Body().BlobKzgCommitments()
+		if err != nil {
+			return err
+		}
+		log = log.WithField("blobCount", len(k))
 	}
 	log.Info("Finished applying state transition")
 	return nil
@@ -87,6 +100,7 @@ func logBlockSyncStatus(block interfaces.BeaconBlock, blockRoot [32]byte, justif
 			"version":                   version.String(block.Version()),
 			"sinceSlotStartTime":        prysmTime.Now().Sub(startTime),
 			"chainServiceProcessedTime": prysmTime.Now().Sub(receivedTime),
+			"deposits":                  len(block.Body().Deposits()),
 		}).Debug("Synced new block")
 	} else {
 		log.WithFields(logrus.Fields{
@@ -95,6 +109,7 @@ func logBlockSyncStatus(block interfaces.BeaconBlock, blockRoot [32]byte, justif
 			"finalizedEpoch": finalized.Epoch,
 			"finalizedRoot":  fmt.Sprintf("0x%s...", hex.EncodeToString(finalized.Root)[:8]),
 			"epoch":          slots.ToEpoch(block.Slot()),
+			"version":        version.String(block.Version()),
 		}).Info("Synced new block")
 	}
 	return nil
@@ -117,12 +132,24 @@ func logPayload(block interfaces.BeaconBlock) error {
 		return errors.New("gas limit should not be 0")
 	}
 	gasUtilized := float64(payload.GasUsed()) / float64(payload.GasLimit())
-
-	log.WithFields(logrus.Fields{
+	fields := logrus.Fields{
 		"blockHash":   fmt.Sprintf("%#x", bytesutil.Trunc(payload.BlockHash())),
 		"parentHash":  fmt.Sprintf("%#x", bytesutil.Trunc(payload.ParentHash())),
 		"blockNumber": payload.BlockNumber,
 		"gasUtilized": fmt.Sprintf("%.2f", gasUtilized),
-	}).Debug("Synced new payload")
+	}
+	if block.Version() >= version.Capella {
+		withdrawals, err := payload.Withdrawals()
+		if err != nil {
+			return errors.Wrap(err, "could not get withdrawals")
+		}
+		fields["withdrawals"] = len(withdrawals)
+		changes, err := block.Body().BLSToExecutionChanges()
+		if err != nil {
+			return errors.Wrap(err, "could not get BLSToExecutionChanges")
+		}
+		fields["blsToExecutionChanges"] = len(changes)
+	}
+	log.WithFields(fields).Debug("Synced new payload")
 	return nil
 }
--- a/beacon-chain/blockchain/metrics.go
+++ b/beacon-chain/blockchain/metrics.go
@@ -317,9 +317,8 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 	var b *precompute.Balance
 	var v []*precompute.Validator
 	var err error
-	switch headState.Version() {
-	case version.Phase0:
-		// Validator participation should be viewed on the canonical chain.
+
+	if headState.Version() == version.Phase0 {
 		v, b, err = precompute.New(ctx, headState)
 		if err != nil {
 			return err
@@ -328,7 +327,7 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 		if err != nil {
 			return err
 		}
-	case version.Altair, version.Bellatrix:
+	} else if headState.Version() >= version.Altair {
 		v, b, err = altair.InitializePrecomputeValidators(ctx, headState)
 		if err != nil {
 			return err
@@ -337,9 +336,10 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 		if err != nil {
 			return err
 		}
-	default:
+	} else {
 		return errors.Errorf("invalid state type provided: %T", headState.ToProtoUnsafe())
 	}
+
 	prevEpochActiveBalances.Set(float64(b.ActivePrevEpoch))
 	prevEpochSourceBalances.Set(float64(b.PrevEpochAttested))
 	prevEpochTargetBalances.Set(float64(b.PrevEpochTargetAttested))
--- a/beacon-chain/blockchain/options.go
+++ b/beacon-chain/blockchain/options.go
@@ -9,6 +9,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/execution"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/attestations"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/blstoexec"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/slashings"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/voluntaryexits"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/p2p"
@@ -99,6 +100,14 @@ func WithSlashingPool(p slashings.PoolManager) Option {
 	}
 }

+// WithBLSToExecPool to keep track of BLS to Execution address changes.
+func WithBLSToExecPool(p blstoexec.PoolManager) Option {
+	return func(s *Service) error {
+		s.cfg.BLSToExecPool = p
+		return nil
+	}
+}
+
 // WithP2PBroadcaster to broadcast messages after appropriate processing.
 func WithP2PBroadcaster(p p2p.Broadcaster) Option {
 	return func(s *Service) error {
--- a/beacon-chain/blockchain/pow_block.go
+++ b/beacon-chain/blockchain/pow_block.go
@@ -15,6 +15,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
 	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v3/runtime/version"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
 	"github.com/sirupsen/logrus"
 )
@@ -22,20 +23,21 @@ import (
 // validateMergeBlock validates terminal block hash in the event of manual overrides before checking for total difficulty.
 //
 // def validate_merge_block(block: BeaconBlock) -> None:
-//    if TERMINAL_BLOCK_HASH != Hash32():
-//        # If `TERMINAL_BLOCK_HASH` is used as an override, the activation epoch must be reached.
-//        assert compute_epoch_at_slot(block.slot) >= TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH
-//        assert block.body.execution_payload.parent_hash == TERMINAL_BLOCK_HASH
-//        return
 //
-//    pow_block = get_pow_block(block.body.execution_payload.parent_hash)
-//    # Check if `pow_block` is available
-//    assert pow_block is not None
-//    pow_parent = get_pow_block(pow_block.parent_hash)
-//    # Check if `pow_parent` is available
-//    assert pow_parent is not None
-//    # Check if `pow_block` is a valid terminal PoW block
-//    assert is_valid_terminal_pow_block(pow_block, pow_parent)
+//	if TERMINAL_BLOCK_HASH != Hash32():
+//	    # If `TERMINAL_BLOCK_HASH` is used as an override, the activation epoch must be reached.
+//	    assert compute_epoch_at_slot(block.slot) >= TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH
+//	    assert block.body.execution_payload.parent_hash == TERMINAL_BLOCK_HASH
+//	    return
+//
+//	pow_block = get_pow_block(block.body.execution_payload.parent_hash)
+//	# Check if `pow_block` is available
+//	assert pow_block is not None
+//	pow_parent = get_pow_block(pow_block.parent_hash)
+//	# Check if `pow_parent` is available
+//	assert pow_parent is not None
+//	# Check if `pow_block` is a valid terminal PoW block
+//	assert is_valid_terminal_pow_block(pow_block, pow_parent)
 func (s *Service) validateMergeBlock(ctx context.Context, b interfaces.SignedBeaconBlock) error {
 	if err := blocks.BeaconBlockIsNil(b); err != nil {
 		return err
@@ -91,6 +93,7 @@ func (s *Service) getBlkParentHashAndTD(ctx context.Context, blkHash []byte) ([]
 	if blk == nil {
 		return nil, nil, errors.New("pow block is nil")
 	}
+	blk.Version = version.Bellatrix
 	blkTDBig, err := hexutil.DecodeBig(blk.TotalDifficulty)
 	if err != nil {
 		return nil, nil, errors.Wrap(err, "could not decode merge block total difficulty")
@@ -105,10 +108,11 @@ func (s *Service) getBlkParentHashAndTD(ctx context.Context, blkHash []byte) ([]
 // validateTerminalBlockHash validates if the merge block is a valid terminal PoW block.
 // spec code:
 // if TERMINAL_BLOCK_HASH != Hash32():
-//        # If `TERMINAL_BLOCK_HASH` is used as an override, the activation epoch must be reached.
-//        assert compute_epoch_at_slot(block.slot) >= TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH
-//        assert block.body.execution_payload.parent_hash == TERMINAL_BLOCK_HASH
-//        return
+//
+//	# If `TERMINAL_BLOCK_HASH` is used as an override, the activation epoch must be reached.
+//	assert compute_epoch_at_slot(block.slot) >= TERMINAL_BLOCK_HASH_ACTIVATION_EPOCH
+//	assert block.body.execution_payload.parent_hash == TERMINAL_BLOCK_HASH
+//	return
 func validateTerminalBlockHash(blkSlot types.Slot, payload interfaces.ExecutionData) error {
 	if bytesutil.ToBytes32(params.BeaconConfig().TerminalBlockHash.Bytes()) == [32]byte{} {
 		return nil
@@ -125,9 +129,10 @@ func validateTerminalBlockHash(blkSlot types.Slot, payload interfaces.ExecutionD
 // validateTerminalBlockDifficulties validates terminal pow block by comparing own total difficulty with parent's total difficulty.
 //
 // def is_valid_terminal_pow_block(block: PowBlock, parent: PowBlock) -> bool:
-//    is_total_difficulty_reached = block.total_difficulty >= TERMINAL_TOTAL_DIFFICULTY
-//    is_parent_total_difficulty_valid = parent.total_difficulty < TERMINAL_TOTAL_DIFFICULTY
-//    return is_total_difficulty_reached and is_parent_total_difficulty_valid
+//
+//	is_total_difficulty_reached = block.total_difficulty >= TERMINAL_TOTAL_DIFFICULTY
+//	is_parent_total_difficulty_valid = parent.total_difficulty < TERMINAL_TOTAL_DIFFICULTY
+//	return is_total_difficulty_reached and is_parent_total_difficulty_valid
 func validateTerminalBlockDifficulties(currentDifficulty *uint256.Int, parentDifficulty *uint256.Int) (bool, error) {
 	b, ok := new(big.Int).SetString(params.BeaconConfig().TerminalTotalDifficulty, 10)
 	if !ok {
--- a/beacon-chain/blockchain/process_attestation.go
+++ b/beacon-chain/blockchain/process_attestation.go
@@ -19,23 +19,24 @@ import (
 // The delay is handled by the caller in `processAttestations`.
 //
 // Spec pseudocode definition:
-//   def on_attestation(store: Store, attestation: Attestation) -> None:
-//    """
-//    Run ``on_attestation`` upon receiving a new ``attestation`` from either within a block or directly on the wire.
 //
-//    An ``attestation`` that is asserted as invalid may be valid at a later time,
-//    consider scheduling it for later processing in such case.
-//    """
-//    validate_on_attestation(store, attestation)
-//    store_target_checkpoint_state(store, attestation.data.target)
+//	def on_attestation(store: Store, attestation: Attestation) -> None:
+//	 """
+//	 Run ``on_attestation`` upon receiving a new ``attestation`` from either within a block or directly on the wire.
 //
-//    # Get state at the `target` to fully validate attestation
-//    target_state = store.checkpoint_states[attestation.data.target]
-//    indexed_attestation = get_indexed_attestation(target_state, attestation)
-//    assert is_valid_indexed_attestation(target_state, indexed_attestation)
+//	 An ``attestation`` that is asserted as invalid may be valid at a later time,
+//	 consider scheduling it for later processing in such case.
+//	 """
+//	 validate_on_attestation(store, attestation)
+//	 store_target_checkpoint_state(store, attestation.data.target)
 //
-//    # Update latest messages for attesting indices
-//    update_latest_messages(store, indexed_attestation.attesting_indices, attestation)
+//	 # Get state at the `target` to fully validate attestation
+//	 target_state = store.checkpoint_states[attestation.data.target]
+//	 indexed_attestation = get_indexed_attestation(target_state, attestation)
+//	 assert is_valid_indexed_attestation(target_state, indexed_attestation)
+//
+//	 # Update latest messages for attesting indices
+//	 update_latest_messages(store, indexed_attestation.attesting_indices, attestation)
 func (s *Service) OnAttestation(ctx context.Context, a *ethpb.Attestation) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.onAttestation")
 	defer span.End()
--- a/beacon-chain/blockchain/process_block.go
+++ b/beacon-chain/blockchain/process_block.go
@@ -45,52 +45,53 @@ var initialSyncBlockCacheSize = uint64(2 * params.BeaconConfig().SlotsPerEpoch)
 // computation in this method and methods it calls into.
 //
 // Spec pseudocode definition:
-//   def on_block(store: Store, signed_block: SignedBeaconBlock) -> None:
-//    block = signed_block.message
-//    # Parent block must be known
-//    assert block.parent_root in store.block_states
-//    # Make a copy of the state to avoid mutability issues
-//    pre_state = copy(store.block_states[block.parent_root])
-//    # Blocks cannot be in the future. If they are, their consideration must be delayed until the are in the past.
-//    assert get_current_slot(store) >= block.slot
 //
-//    # Check that block is later than the finalized epoch slot (optimization to reduce calls to get_ancestor)
-//    finalized_slot = compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
-//    assert block.slot > finalized_slot
-//    # Check block is a descendant of the finalized block at the checkpoint finalized slot
-//    assert get_ancestor(store, block.parent_root, finalized_slot) == store.finalized_checkpoint.root
+//	def on_block(store: Store, signed_block: SignedBeaconBlock) -> None:
+//	 block = signed_block.message
+//	 # Parent block must be known
+//	 assert block.parent_root in store.block_states
+//	 # Make a copy of the state to avoid mutability issues
+//	 pre_state = copy(store.block_states[block.parent_root])
+//	 # Blocks cannot be in the future. If they are, their consideration must be delayed until the are in the past.
+//	 assert get_current_slot(store) >= block.slot
 //
-//    # Check the block is valid and compute the post-state
-//    state = pre_state.copy()
-//    state_transition(state, signed_block, True)
-//    # Add new block to the store
-//    store.blocks[hash_tree_root(block)] = block
-//    # Add new state for this block to the store
-//    store.block_states[hash_tree_root(block)] = state
+//	 # Check that block is later than the finalized epoch slot (optimization to reduce calls to get_ancestor)
+//	 finalized_slot = compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
+//	 assert block.slot > finalized_slot
+//	 # Check block is a descendant of the finalized block at the checkpoint finalized slot
+//	 assert get_ancestor(store, block.parent_root, finalized_slot) == store.finalized_checkpoint.root
 //
-//    # Update justified checkpoint
-//    if state.current_justified_checkpoint.epoch > store.justified_checkpoint.epoch:
-//        if state.current_justified_checkpoint.epoch > store.best_justified_checkpoint.epoch:
-//            store.best_justified_checkpoint = state.current_justified_checkpoint
-//        if should_update_justified_checkpoint(store, state.current_justified_checkpoint):
-//            store.justified_checkpoint = state.current_justified_checkpoint
+//	 # Check the block is valid and compute the post-state
+//	 state = pre_state.copy()
+//	 state_transition(state, signed_block, True)
+//	 # Add new block to the store
+//	 store.blocks[hash_tree_root(block)] = block
+//	 # Add new state for this block to the store
+//	 store.block_states[hash_tree_root(block)] = state
 //
-//    # Update finalized checkpoint
-//    if state.finalized_checkpoint.epoch > store.finalized_checkpoint.epoch:
-//        store.finalized_checkpoint = state.finalized_checkpoint
+//	 # Update justified checkpoint
+//	 if state.current_justified_checkpoint.epoch > store.justified_checkpoint.epoch:
+//	     if state.current_justified_checkpoint.epoch > store.best_justified_checkpoint.epoch:
+//	         store.best_justified_checkpoint = state.current_justified_checkpoint
+//	     if should_update_justified_checkpoint(store, state.current_justified_checkpoint):
+//	         store.justified_checkpoint = state.current_justified_checkpoint
 //
-//        # Potentially update justified if different from store
-//        if store.justified_checkpoint != state.current_justified_checkpoint:
-//            # Update justified if new justified is later than store justified
-//            if state.current_justified_checkpoint.epoch > store.justified_checkpoint.epoch:
-//                store.justified_checkpoint = state.current_justified_checkpoint
-//                return
+//	 # Update finalized checkpoint
+//	 if state.finalized_checkpoint.epoch > store.finalized_checkpoint.epoch:
+//	     store.finalized_checkpoint = state.finalized_checkpoint
 //
-//            # Update justified if store justified is not in chain with finalized checkpoint
-//            finalized_slot = compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
-//            ancestor_at_finalized_slot = get_ancestor(store, store.justified_checkpoint.root, finalized_slot)
-//            if ancestor_at_finalized_slot != store.finalized_checkpoint.root:
-//                store.justified_checkpoint = state.current_justified_checkpoint
+//	     # Potentially update justified if different from store
+//	     if store.justified_checkpoint != state.current_justified_checkpoint:
+//	         # Update justified if new justified is later than store justified
+//	         if state.current_justified_checkpoint.epoch > store.justified_checkpoint.epoch:
+//	             store.justified_checkpoint = state.current_justified_checkpoint
+//	             return
+//
+//	         # Update justified if store justified is not in chain with finalized checkpoint
+//	         finalized_slot = compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
+//	         ancestor_at_finalized_slot = get_ancestor(store, store.justified_checkpoint.root, finalized_slot)
+//	         if ancestor_at_finalized_slot != store.finalized_checkpoint.root:
+//	             store.justified_checkpoint = state.current_justified_checkpoint
 func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlock, blockRoot [32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.onBlock")
 	defer span.End()
@@ -145,6 +146,10 @@ func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlo
 	if err := s.handleBlockAttestations(ctx, signed.Block(), postState); err != nil {
 		return errors.Wrap(err, "could not handle block's attestations")
 	}
+	if err := s.handleBlockBLSToExecChanges(signed.Block()); err != nil {
+		return errors.Wrap(err, "could not handle block's BLSToExecutionChanges")
+	}
+
 	s.InsertSlashingsToForkChoiceStore(ctx, signed.Block().Body().AttesterSlashings())
 	if isValidPayload {
 		if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, blockRoot); err != nil {
@@ -332,11 +337,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeac

 	jCheckpoints := make([]*ethpb.Checkpoint, len(blks))
 	fCheckpoints := make([]*ethpb.Checkpoint, len(blks))
-	sigSet := &bls.SignatureBatch{
-		Signatures: [][]byte{},
-		PublicKeys: []bls.PublicKey{},
-		Messages:   [][32]byte{},
-	}
+	sigSet := bls.NewSet()
 	type versionAndHeader struct {
 		version int
 		header  interfaces.ExecutionData
@@ -376,7 +377,13 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeac
 		}
 		sigSet.Join(set)
 	}
-	verify, err := sigSet.Verify()
+
+	var verify bool
+	if features.Get().EnableVerboseSigVerification {
+		verify, err = sigSet.VerifyVerbosely()
+	} else {
+		verify, err = sigSet.Verify()
+	}
 	if err != nil {
 		return invalidBlock{error: err}
 	}
@@ -524,11 +531,7 @@ func (s *Service) insertBlockToForkchoiceStore(ctx context.Context, blk interfac
 		}
 	}

-	if err := s.cfg.ForkChoiceStore.InsertNode(ctx, st, root); err != nil {
-		return err
-	}
-
-	return nil
+	return s.cfg.ForkChoiceStore.InsertNode(ctx, st, root)
 }

 // This feeds in the attestations included in the block to fork choice store. It's allows fork choice store
@@ -554,6 +557,22 @@ func (s *Service) handleBlockAttestations(ctx context.Context, blk interfaces.Be
 	return nil
 }

+func (s *Service) handleBlockBLSToExecChanges(blk interfaces.BeaconBlock) error {
+	if blk.Version() < version.Capella {
+		return nil
+	}
+	changes, err := blk.Body().BLSToExecutionChanges()
+	if err != nil {
+		return errors.Wrap(err, "could not get BLSToExecutionChanges")
+	}
+	for _, change := range changes {
+		if err := s.cfg.BLSToExecPool.MarkIncluded(change); err != nil {
+			return errors.Wrap(err, "could not mark BLSToExecutionChange as included")
+		}
+	}
+	return nil
+}
+
 // InsertSlashingsToForkChoiceStore inserts attester slashing indices to fork choice store.
 // To call this function, it's caller's responsibility to ensure the slashing object is valid.
 func (s *Service) InsertSlashingsToForkChoiceStore(ctx context.Context, slashings []*ethpb.AttesterSlashing) {
@@ -664,26 +683,8 @@ func (s *Service) fillMissingPayloadIDRoutine(ctx context.Context, stateFeed *ev
 		for {
 			select {
 			case ti := <-ticker.C:
-				if !atHalfSlot(ti) {
-					continue
-				}
-				// Head root should be empty when retrieving proposer index for the next slot.
-				_, id, has := s.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(s.CurrentSlot()+1, [32]byte{} /* head root */)
-				// There exists proposer for next slot, but we haven't called fcu w/ payload attribute yet.
-				if has && id == [8]byte{} {
-					headBlock, err := s.headBlock()
-					if err != nil {
-						log.WithError(err).Error("Could not get head block")
-					} else {
-						if _, err := s.notifyForkchoiceUpdate(ctx, &notifyForkchoiceUpdateArg{
-							headState: s.headState(ctx),
-							headRoot:  s.headRoot(),
-							headBlock: headBlock.Block(),
-						}); err != nil {
-							log.WithError(err).Error("Could not prepare payload on empty ID")
-						}
-					}
-					missedPayloadIDFilledCount.Inc()
+				if err := s.fillMissingBlockPayloadId(ctx, ti); err != nil {
+					log.WithError(err).Error("Could not fill missing payload ID")
 				}
 			case <-s.ctx.Done():
 				log.Debug("Context closed, exiting routine")
@@ -698,3 +699,31 @@ func atHalfSlot(t time.Time) bool {
 	s := params.BeaconConfig().SecondsPerSlot
 	return uint64(t.Second())%s == s/2
 }
+
+func (s *Service) fillMissingBlockPayloadId(ctx context.Context, ti time.Time) error {
+	if !atHalfSlot(ti) {
+		return nil
+	}
+	if s.CurrentSlot() == s.cfg.ForkChoiceStore.HighestReceivedBlockSlot() {
+		return nil
+	}
+	// Head root should be empty when retrieving proposer index for the next slot.
+	_, id, has := s.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(s.CurrentSlot()+1, [32]byte{} /* head root */)
+	// There exists proposer for next slot, but we haven't called fcu w/ payload attribute yet.
+	if has && id == [8]byte{} {
+		missedPayloadIDFilledCount.Inc()
+		headBlock, err := s.headBlock()
+		if err != nil {
+			return err
+		} else {
+			if _, err := s.notifyForkchoiceUpdate(ctx, &notifyForkchoiceUpdateArg{
+				headState: s.headState(ctx),
+				headRoot:  s.headRoot(),
+				headBlock: headBlock.Block(),
+			}); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
--- a/beacon-chain/blockchain/process_block_helpers.go
+++ b/beacon-chain/blockchain/process_block_helpers.go
@@ -6,7 +6,6 @@ import (
 	"fmt"

 	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/helpers"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/doubly-linked-tree"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
@@ -69,6 +68,7 @@ func (s *Service) verifyBlkPreState(ctx context.Context, b interfaces.BeaconBloc
 	// during initial syncing. There's no risk given a state summary object is just a
 	// a subset of the block object.
 	if !s.cfg.BeaconDB.HasStateSummary(ctx, parentRoot) && !s.cfg.BeaconDB.HasBlock(ctx, parentRoot) {
+		log.Errorf("requesting blockroot %#x", bytesutil.Trunc(parentRoot[:]))
 		return errors.New("could not reconstruct parent state")
 	}

@@ -185,15 +185,16 @@ func (s *Service) updateFinalized(ctx context.Context, cp *ethpb.Checkpoint) err
 // ancestor returns the block root of an ancestry block from the input block root.
 //
 // Spec pseudocode definition:
-//   def get_ancestor(store: Store, root: Root, slot: Slot) -> Root:
-//    block = store.blocks[root]
-//    if block.slot > slot:
-//        return get_ancestor(store, block.parent_root, slot)
-//    elif block.slot == slot:
-//        return root
-//    else:
-//        # root is older than queried slot, thus a skip slot. Return most recent root prior to slot
-//        return root
+//
+//	def get_ancestor(store: Store, root: Root, slot: Slot) -> Root:
+//	 block = store.blocks[root]
+//	 if block.slot > slot:
+//	     return get_ancestor(store, block.parent_root, slot)
+//	 elif block.slot == slot:
+//	     return root
+//	 else:
+//	     # root is older than queried slot, thus a skip slot. Return most recent root prior to slot
+//	     return root
 func (s *Service) ancestor(ctx context.Context, root []byte, slot types.Slot) ([]byte, error) {
 	ctx, span := trace.StartSpan(ctx, "blockChain.ancestor")
 	defer span.End()
@@ -316,23 +317,6 @@ func (s *Service) insertFinalizedDeposits(ctx context.Context, fRoot [32]byte) e
 	return nil
 }

-// The deletes input attestations from the attestation pool, so proposers don't include them in a block for the future.
-func (s *Service) deletePoolAtts(atts []*ethpb.Attestation) error {
-	for _, att := range atts {
-		if helpers.IsAggregated(att) {
-			if err := s.cfg.AttPool.DeleteAggregatedAttestation(att); err != nil {
-				return err
-			}
-		} else {
-			if err := s.cfg.AttPool.DeleteUnaggregatedAttestation(att); err != nil {
-				return err
-			}
-		}
-	}
-
-	return nil
-}
-
 // This ensures that the input root defaults to using genesis root instead of zero hashes. This is needed for handling
 // fork choice justification routine.
 func (s *Service) ensureRootNotZeros(root [32]byte) [32]byte {
--- a/beacon-chain/blockchain/process_block_test.go
+++ b/beacon-chain/blockchain/process_block_test.go
@@ -26,6 +26,7 @@ import (
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/doubly-linked-tree"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/attestations"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/blstoexec"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
@@ -58,7 +59,7 @@ func TestStore_OnBlock(t *testing.T) {

 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	genesisStateRoot := [32]byte{}
+	var genesisStateRoot [32]byte
 	genesis := blocks.NewGenesisBlock(genesisStateRoot[:])
 	util.SaveBlock(t, ctx, beaconDB, genesis)
 	validGenesisRoot, err := genesis.Block.HashTreeRoot()
@@ -361,7 +362,7 @@ func TestFillForkChoiceMissingBlocks_FilterFinalized(t *testing.T) {
 	require.NoError(t, err)
 	service.cfg.ForkChoiceStore = doublylinkedtree.New()

-	genesisStateRoot := [32]byte{}
+	var genesisStateRoot [32]byte
 	genesis := blocks.NewGenesisBlock(genesisStateRoot[:])
 	util.SaveBlock(t, ctx, beaconDB, genesis)
 	validGenesisRoot, err := genesis.Block.HashTreeRoot()
@@ -420,7 +421,7 @@ func TestFillForkChoiceMissingBlocks_FinalizedSibling(t *testing.T) {
 	require.NoError(t, err)
 	service.cfg.ForkChoiceStore = doublylinkedtree.New()

-	genesisStateRoot := [32]byte{}
+	var genesisStateRoot [32]byte
 	genesis := blocks.NewGenesisBlock(genesisStateRoot[:])
 	util.SaveBlock(t, ctx, beaconDB, genesis)
 	validGenesisRoot, err := genesis.Block.HashTreeRoot()
@@ -446,9 +447,12 @@ func TestFillForkChoiceMissingBlocks_FinalizedSibling(t *testing.T) {
 }

 // blockTree1 constructs the following tree:
-//    /- B1
+//
+//	/- B1
+//
 // B0           /- B5 - B7
-//    \- B3 - B4 - B6 - B8
+//
+//	\- B3 - B4 - B6 - B8
 func blockTree1(t *testing.T, beaconDB db.Database, genesisRoot []byte) ([][]byte, error) {
 	genesisRoot = bytesutil.PadTo(genesisRoot, 32)
 	b0 := util.NewBeaconBlock()
@@ -1000,7 +1004,7 @@ func TestInsertFinalizedDeposits(t *testing.T) {
 	assert.NoError(t, gs.SetEth1Data(&ethpb.Eth1Data{DepositCount: 10}))
 	assert.NoError(t, gs.SetEth1DepositIndex(8))
 	assert.NoError(t, service.cfg.StateGen.SaveState(ctx, [32]byte{'m', 'o', 'c', 'k'}, gs))
-	zeroSig := [96]byte{}
+	var zeroSig [96]byte
 	for i := uint64(0); i < uint64(4*params.BeaconConfig().SlotsPerEpoch); i++ {
 		root := []byte(strconv.Itoa(int(i)))
 		assert.NoError(t, depositCache.InsertDeposit(ctx, &ethpb.Deposit{Data: &ethpb.Deposit_Data{
@@ -1038,7 +1042,7 @@ func TestInsertFinalizedDeposits_MultipleFinalizedRoutines(t *testing.T) {
 	assert.NoError(t, gs2.SetEth1Data(&ethpb.Eth1Data{DepositCount: 15}))
 	assert.NoError(t, gs2.SetEth1DepositIndex(13))
 	assert.NoError(t, service.cfg.StateGen.SaveState(ctx, [32]byte{'m', 'o', 'c', 'k', '2'}, gs2))
-	zeroSig := [96]byte{}
+	var zeroSig [96]byte
 	for i := uint64(0); i < uint64(4*params.BeaconConfig().SlotsPerEpoch); i++ {
 		root := []byte(strconv.Itoa(int(i)))
 		assert.NoError(t, depositCache.InsertDeposit(ctx, &ethpb.Deposit{Data: &ethpb.Deposit_Data{
@@ -1989,216 +1993,6 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	require.Equal(t, false, optimistic)
 }

-// See the description in #10777 and #10782 for the full setup
-// We sync optimistically a chain of blocks. Block 12 is the first block in Epoch
-// 2 (and the merge block in this sequence). Block 18 justifies it and Block 19 returns
-// INVALID from NewPayload, with LVH block 12. No head is viable. We check
-// that the node is optimistic and that we can actually import a chain of blocks on top of
-// 12 and recover. Notice that it takes two epochs to fully recover, and we stay
-// optimistic for the whole time.
-func TestStore_NoViableHead_Liveness_Protoarray(t *testing.T) {
-	params.SetupTestConfigCleanup(t)
-	config := params.BeaconConfig()
-	config.SlotsPerEpoch = 6
-	config.AltairForkEpoch = 1
-	config.BellatrixForkEpoch = 2
-	params.OverrideBeaconConfig(config)
-
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-
-	mockEngine := &mockExecution.EngineClient{ErrNewPayload: execution.ErrAcceptedSyncingPayloadStatus, ErrForkchoiceUpdated: execution.ErrAcceptedSyncingPayloadStatus}
-	fc := doublylinkedtree.New()
-	opts := []Option{
-		WithDatabase(beaconDB),
-		WithAttestationPool(attestations.NewPool()),
-		WithStateGen(stategen.New(beaconDB, fc)),
-		WithForkChoiceStore(fc),
-		WithStateNotifier(&mock.MockStateNotifier{}),
-		WithExecutionEngineCaller(mockEngine),
-		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
-	}
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-
-	st, keys := util.DeterministicGenesisState(t, 64)
-	stateRoot, err := st.HashTreeRoot(ctx)
-	require.NoError(t, err, "Could not hash genesis state")
-
-	require.NoError(t, service.saveGenesisData(ctx, st))
-
-	genesis := blocks.NewGenesisBlock(stateRoot[:])
-	wsb, err := consensusblocks.NewSignedBeaconBlock(genesis)
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wsb), "Could not save genesis block")
-
-	parentRoot, err := genesis.Block.HashTreeRoot()
-	require.NoError(t, err, "Could not get signing root")
-	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, st, parentRoot), "Could not save genesis state")
-	require.NoError(t, service.cfg.BeaconDB.SaveHeadBlockRoot(ctx, parentRoot), "Could not save genesis state")
-
-	for i := 1; i < 6; i++ {
-		driftGenesisTime(service, int64(i), 0)
-		st, err := service.HeadState(ctx)
-		require.NoError(t, err)
-		b, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), types.Slot(i))
-		require.NoError(t, err)
-		wsb, err := consensusblocks.NewSignedBeaconBlock(b)
-		require.NoError(t, err)
-		root, err := b.Block.HashTreeRoot()
-		require.NoError(t, err)
-		require.NoError(t, service.onBlock(ctx, wsb, root))
-	}
-
-	for i := 6; i < 12; i++ {
-		driftGenesisTime(service, int64(i), 0)
-		st, err := service.HeadState(ctx)
-		require.NoError(t, err)
-		b, err := util.GenerateFullBlockAltair(st, keys, util.DefaultBlockGenConfig(), types.Slot(i))
-		require.NoError(t, err)
-		wsb, err := consensusblocks.NewSignedBeaconBlock(b)
-		require.NoError(t, err)
-		root, err := b.Block.HashTreeRoot()
-		require.NoError(t, err)
-		err = service.onBlock(ctx, wsb, root)
-		require.NoError(t, err)
-	}
-
-	// import the merge block
-	driftGenesisTime(service, 12, 0)
-	st, err = service.HeadState(ctx)
-	require.NoError(t, err)
-	b, err := util.GenerateFullBlockBellatrix(st, keys, util.DefaultBlockGenConfig(), 12)
-	require.NoError(t, err)
-	wsb, err = consensusblocks.NewSignedBeaconBlock(b)
-	require.NoError(t, err)
-	lastValidRoot, err := b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	err = service.onBlock(ctx, wsb, lastValidRoot)
-	require.NoError(t, err)
-	// save the post state and the payload Hash of this block since it will
-	// be the LVH
-	validHeadState, err := service.HeadState(ctx)
-	require.NoError(t, err)
-	lvh := b.Block.Body.ExecutionPayload.BlockHash
-	validjc := validHeadState.CurrentJustifiedCheckpoint()
-	require.Equal(t, types.Epoch(0), validjc.Epoch)
-
-	// import blocks 13 through 18 to justify 12, these are invalid blocks
-	invalidRoots := make([][32]byte, 19-13)
-	for i := 13; i < 19; i++ {
-		driftGenesisTime(service, int64(i), 0)
-		st, err := service.HeadState(ctx)
-		require.NoError(t, err)
-		b, err := util.GenerateFullBlockBellatrix(st, keys, util.DefaultBlockGenConfig(), types.Slot(i))
-		require.NoError(t, err)
-		wsb, err := consensusblocks.NewSignedBeaconBlock(b)
-		require.NoError(t, err)
-		invalidRoots[i-13], err = b.Block.HashTreeRoot()
-		require.NoError(t, err)
-		err = service.onBlock(ctx, wsb, invalidRoots[i-13])
-		require.NoError(t, err)
-	}
-	// Check that we have justified the second epoch
-	jc := service.ForkChoicer().JustifiedCheckpoint()
-	require.Equal(t, types.Epoch(2), jc.Epoch)
-	invalidHeadRoot := service.ForkChoicer().CachedHeadRoot()
-
-	// import block 19 to find out that the whole chain 13--18 was in fact
-	// invalid
-	mockEngine = &mockExecution.EngineClient{ErrNewPayload: execution.ErrInvalidPayloadStatus, NewPayloadResp: lvh}
-	service.cfg.ExecutionEngineCaller = mockEngine
-	driftGenesisTime(service, 19, 0)
-	st, err = service.HeadState(ctx)
-	require.NoError(t, err)
-	b, err = util.GenerateFullBlockBellatrix(st, keys, util.DefaultBlockGenConfig(), 19)
-	require.NoError(t, err)
-	wsb, err = consensusblocks.NewSignedBeaconBlock(b)
-	require.NoError(t, err)
-	root, err := b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	err = service.onBlock(ctx, wsb, root)
-	require.ErrorContains(t, "received an INVALID payload from execution engine", err)
-
-	// Check that forkchoice's head and store's headroot are the previous head (since the invalid block did
-	// not finish importing and it was never imported to forkchoice). Check
-	// also that the node is optimistic
-	require.Equal(t, invalidHeadRoot, service.ForkChoicer().CachedHeadRoot())
-	headRoot, err := service.HeadRoot(ctx)
-	require.NoError(t, err)
-	require.Equal(t, invalidHeadRoot, bytesutil.ToBytes32(headRoot))
-	optimistic, err := service.IsOptimistic(ctx)
-	require.NoError(t, err)
-	require.Equal(t, true, optimistic)
-
-	// Check that the invalid blocks are not in database
-	for i := 0; i < 19-13; i++ {
-		require.Equal(t, false, service.cfg.BeaconDB.HasBlock(ctx, invalidRoots[i]))
-	}
-
-	// Check that the node's justified checkpoint does not agree with the
-	// last valid state's justified checkpoint
-	sjc := service.CurrentJustifiedCheckpt()
-	require.Equal(t, types.Epoch(2), sjc.Epoch)
-
-	// import another block based on the last valid head state
-	mockEngine = &mockExecution.EngineClient{}
-	service.cfg.ExecutionEngineCaller = mockEngine
-	driftGenesisTime(service, 20, 0)
-	b, err = util.GenerateFullBlockBellatrix(validHeadState, keys, &util.BlockGenConfig{}, 20)
-	require.NoError(t, err)
-	wsb, err = consensusblocks.NewSignedBeaconBlock(b)
-	require.NoError(t, err)
-	root, err = b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	require.NoError(t, service.onBlock(ctx, wsb, root))
-	// Check that the head is still INVALID and the node is still optimistic
-	require.Equal(t, invalidHeadRoot, service.ForkChoicer().CachedHeadRoot())
-	optimistic, err = service.IsOptimistic(ctx)
-	require.NoError(t, err)
-	require.Equal(t, true, optimistic)
-	st, err = service.cfg.StateGen.StateByRoot(ctx, root)
-	require.NoError(t, err)
-	// Import blocks 21--30 (Epoch 3 was not enough to justify 2)
-	for i := 21; i < 30; i++ {
-		driftGenesisTime(service, int64(i), 0)
-		require.NoError(t, err)
-		b, err := util.GenerateFullBlockBellatrix(st, keys, util.DefaultBlockGenConfig(), types.Slot(i))
-		require.NoError(t, err)
-		wsb, err := consensusblocks.NewSignedBeaconBlock(b)
-		require.NoError(t, err)
-		root, err := b.Block.HashTreeRoot()
-		require.NoError(t, err)
-		err = service.onBlock(ctx, wsb, root)
-		require.NoError(t, err)
-		st, err = service.cfg.StateGen.StateByRoot(ctx, root)
-		require.NoError(t, err)
-	}
-	// Head should still be INVALID and the node optimistic
-	require.Equal(t, invalidHeadRoot, service.ForkChoicer().CachedHeadRoot())
-	optimistic, err = service.IsOptimistic(ctx)
-	require.NoError(t, err)
-	require.Equal(t, true, optimistic)
-
-	// Import block 30, it should justify Epoch 4 and become HEAD, the node
-	// recovers
-	driftGenesisTime(service, 30, 0)
-	b, err = util.GenerateFullBlockBellatrix(st, keys, util.DefaultBlockGenConfig(), 30)
-	require.NoError(t, err)
-	wsb, err = consensusblocks.NewSignedBeaconBlock(b)
-	require.NoError(t, err)
-	root, err = b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	err = service.onBlock(ctx, wsb, root)
-	require.NoError(t, err)
-	require.Equal(t, root, service.ForkChoicer().CachedHeadRoot())
-	sjc = service.CurrentJustifiedCheckpt()
-	require.Equal(t, types.Epoch(4), sjc.Epoch)
-	optimistic, err = service.IsOptimistic(ctx)
-	require.NoError(t, err)
-	require.Equal(t, false, optimistic)
-}
-
 type newForkChoicer func() forkchoice.ForkChoicer

 // See the description in #10777 and #10782 for the full setup
@@ -2496,6 +2290,80 @@ func TestOnBlock_HandleBlockAttestations(t *testing.T) {
 	require.Equal(t, 1, len(service.cfg.AttPool.BlockAttestations()))
 }

+func TestFillMissingBlockPayloadId_DiffSlotExitEarly(t *testing.T) {
+	fc := doublylinkedtree.New()
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+
+	opts := []Option{
+		WithForkChoiceStore(fc),
+		WithStateGen(stategen.New(beaconDB, fc)),
+	}
+
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+	require.NoError(t, service.fillMissingBlockPayloadId(ctx, time.Unix(int64(params.BeaconConfig().SecondsPerSlot/2), 0)))
+}
+
+func TestHandleBBlockBLSToExecutionChanges(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+	fc := doublylinkedtree.New()
+	pool := blstoexec.NewPool()
+	opts := []Option{
+		WithDatabase(beaconDB),
+		WithStateGen(stategen.New(beaconDB, fc)),
+		WithForkChoiceStore(fc),
+		WithStateNotifier(&mock.MockStateNotifier{}),
+		WithBLSToExecPool(pool),
+	}
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+
+	t.Run("pre Capella block", func(t *testing.T) {
+		body := &ethpb.BeaconBlockBodyBellatrix{}
+		pbb := &ethpb.BeaconBlockBellatrix{
+			Body: body,
+		}
+		blk, err := consensusblocks.NewBeaconBlock(pbb)
+		require.NoError(t, err)
+		require.NoError(t, service.handleBlockBLSToExecChanges(blk))
+	})
+
+	t.Run("Post Capella no changes", func(t *testing.T) {
+		body := &ethpb.BeaconBlockBodyCapella{}
+		pbb := &ethpb.BeaconBlockCapella{
+			Body: body,
+		}
+		blk, err := consensusblocks.NewBeaconBlock(pbb)
+		require.NoError(t, err)
+		require.NoError(t, service.handleBlockBLSToExecChanges(blk))
+	})
+
+	t.Run("Post Capella some changes", func(t *testing.T) {
+		idx := types.ValidatorIndex(123)
+		change := &ethpb.BLSToExecutionChange{
+			ValidatorIndex: idx,
+		}
+		signedChange := &ethpb.SignedBLSToExecutionChange{
+			Message: change,
+		}
+		body := &ethpb.BeaconBlockBodyCapella{
+			BlsToExecutionChanges: []*ethpb.SignedBLSToExecutionChange{signedChange},
+		}
+		pbb := &ethpb.BeaconBlockCapella{
+			Body: body,
+		}
+		blk, err := consensusblocks.NewBeaconBlock(pbb)
+		require.NoError(t, err)
+
+		pool.InsertBLSToExecChange(signedChange)
+		require.Equal(t, true, pool.ValidatorExists(idx))
+		require.NoError(t, service.handleBlockBLSToExecChanges(blk))
+		require.Equal(t, false, pool.ValidatorExists(idx))
+	})
+}
+
 // Helper function to simulate the block being on time or delayed for proposer
 // boost. It alters the genesisTime tracked by the store.
 func driftGenesisTime(s *Service, slot int64, delay int64) {
--- a/beacon-chain/blockchain/receive_attestation_test.go
+++ b/beacon-chain/blockchain/receive_attestation_test.go
@@ -159,7 +159,6 @@ func TestNotifyEngineIfChangedHead(t *testing.T) {
 	require.NoError(t, service.saveInitSyncBlock(ctx, r1, wsb))
 	st, _ := util.DeterministicGenesisState(t, 1)
 	service.head = &head{
-		slot:  1,
 		root:  r1,
 		block: wsb,
 		state: st,
@@ -177,7 +176,6 @@ func TestNotifyEngineIfChangedHead(t *testing.T) {
 	require.NoError(t, err)
 	st, _ = util.DeterministicGenesisState(t, 1)
 	service.head = &head{
-		slot:  1,
 		root:  r1,
 		block: wsb,
 		state: st,
@@ -226,11 +224,11 @@ func TestService_ProcessAttestationsAndUpdateHead(t *testing.T) {
 	require.Equal(t, 2, fcs.NodeCount())
 	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wsb))

-	// Generate attestatios for this block in Slot 1
+	// Generate attestations for this block in Slot 1
 	atts, err := util.GenerateAttestations(copied, pks, 1, 1, false)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.AttPool.SaveForkchoiceAttestations(atts))
-	// Verify the target is in forchoice
+	// Verify the target is in forkchoice
 	require.Equal(t, true, fcs.HasNode(bytesutil.ToBytes32(atts[0].Data.BeaconBlockRoot)))

 	// Insert a new block to forkchoice
--- a/beacon-chain/blockchain/receive_block.go
+++ b/beacon-chain/blockchain/receive_block.go
@@ -6,6 +6,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/feed"
 	statefeed "github.com/prysmaticlabs/prysm/v3/beacon-chain/core/feed/state"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/transition/interop"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
 	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/monitoring/tracing"
@@ -32,9 +33,9 @@ type SlashingReceiver interface {

 // ReceiveBlock is a function that defines the operations (minus pubsub)
 // that are performed on a received block. The operations consist of:
-//   1. Validate block, apply state transition and update checkpoints
-//   2. Apply fork choice to the processed block
-//   3. Save latest head info
+//  1. Validate block, apply state transition and update checkpoints
+//  2. Apply fork choice to the processed block
+//  3. Save latest head info
 func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.SignedBeaconBlock, blockRoot [32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.ReceiveBlock")
 	defer span.End()
@@ -48,6 +49,7 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.SignedBeaco
 	if err := s.onBlock(ctx, blockCopy, blockRoot); err != nil {
 		err := errors.Wrap(err, "could not process block")
 		tracing.AnnotateError(span, err)
+		interop.WriteBlockToDisk("state_transition", blockCopy, true /*failed*/)
 		return err
 	}

@@ -145,11 +147,6 @@ func (s *Service) ReceiveAttesterSlashing(ctx context.Context, slashing *ethpb.A
 }

 func (s *Service) handlePostBlockOperations(b interfaces.BeaconBlock) error {
-	// Delete the processed block attestations from attestation pool.
-	if err := s.deletePoolAtts(b.Body().Attestations()); err != nil {
-		return err
-	}
-
 	// Mark block exits as seen so we don't include same ones in future blocks.
 	for _, e := range b.Body().VoluntaryExits() {
 		s.cfg.ExitPool.MarkIncluded(e)
--- a/beacon-chain/blockchain/receive_block_test.go
+++ b/beacon-chain/blockchain/receive_block_test.go
@@ -33,7 +33,7 @@ func TestService_ReceiveBlock(t *testing.T) {
 		assert.NoError(t, err)
 		return blk
 	}
-	params.SetupTestConfigCleanupWithLock(t)
+	//params.SetupTestConfigCleanupWithLock(t)
 	bc := params.BeaconConfig().Copy()
 	bc.ShardCommitteePeriod = 0 // Required for voluntary exits test in reasonable time.
 	params.OverrideBeaconConfig(bc)
--- a/beacon-chain/blockchain/service.go
+++ b/beacon-chain/blockchain/service.go
@@ -23,6 +23,7 @@ import (
 	f "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/attestations"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/blstoexec"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/slashings"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/voluntaryexits"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/p2p"
@@ -70,6 +71,7 @@ type config struct {
 	AttPool                 attestations.Pool
 	ExitPool                voluntaryexits.PoolManager
 	SlashingPool            slashings.PoolManager
+	BLSToExecPool           blstoexec.PoolManager
 	P2p                     p2p.Broadcaster
 	MaxRoutines             int
 	StateNotifier           statefeed.Notifier
--- a/beacon-chain/cache/BUILD.bazel
+++ b/beacon-chain/cache/BUILD.bazel
@@ -6,6 +6,7 @@ go_library(
        "active_balance.go",
        "active_balance_disabled.go",  # keep
        "attestation_data.go",
+        "blobs.go",
        "checkpoint_state.go",
        "committee.go",
        "committee_disabled.go",  # keep
@@ -40,6 +41,7 @@ go_library(
        "//crypto/rand:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//math:go_default_library",
+        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//runtime/version:go_default_library",
        "@com_github_hashicorp_golang_lru//:go_default_library",
--- a/beacon-chain/cache/blobs.go
+++ b/beacon-chain/cache/blobs.go
@@ -0,0 +1,51 @@
+package cache
+
+import (
+	"sync"
+
+	"github.com/pkg/errors"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	v1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
+)
+
+var (
+	// blobsCacheMiss tracks the number of blobs requests that aren't present in the cache.
+	blobsCacheMiss = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "total_blobs_cache_miss",
+		Help: "The number of get requests that aren't present in the cache.",
+	})
+	errNoSidecar = errors.New("no sidecar")
+)
+
+// BlobsCache caches the blobs for the proposer through life cycle.
+type BlobsCache struct {
+	cache map[types.Slot][]*v1.Blob
+	sync.Mutex
+}
+
+func NewBlobsCache() *BlobsCache {
+	return &BlobsCache{
+		cache: map[types.Slot][]*v1.Blob{},
+	}
+}
+
+func (b *BlobsCache) Get(slot types.Slot) ([]*v1.Blob, error) {
+	b.Lock()
+	defer b.Unlock()
+
+	sc, ok := b.cache[slot]
+	if !ok {
+		blobsCacheMiss.Inc()
+		return nil, errNoSidecar
+	}
+	delete(b.cache, slot)
+	return sc, nil
+}
+
+func (b *BlobsCache) Put(slot types.Slot, blobs []*v1.Blob) {
+	b.Lock()
+	defer b.Unlock()
+	b.cache[slot] = blobs
+}
--- a/beacon-chain/cache/checkpoint_state.go
+++ b/beacon-chain/cache/checkpoint_state.go
@@ -1,8 +1,6 @@
 package cache

 import (
-	"sync"
-
 	lru "github.com/hashicorp/golang-lru"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
@@ -32,7 +30,6 @@ var (
 // CheckpointStateCache is a struct with 1 queue for looking up state by checkpoint.
 type CheckpointStateCache struct {
 	cache *lru.Cache
-	lock  sync.RWMutex
 }

 // NewCheckpointStateCache creates a new checkpoint state cache for storing/accessing processed state.
@@ -45,8 +42,6 @@ func NewCheckpointStateCache() *CheckpointStateCache {
 // StateByCheckpoint fetches state by checkpoint. Returns true with a
 // reference to the CheckpointState info, if exists. Otherwise returns false, nil.
 func (c *CheckpointStateCache) StateByCheckpoint(cp *ethpb.Checkpoint) (state.BeaconState, error) {
-	c.lock.RLock()
-	defer c.lock.RUnlock()
 	h, err := hash.HashProto(cp)
 	if err != nil {
 		return nil, err
@@ -67,8 +62,6 @@ func (c *CheckpointStateCache) StateByCheckpoint(cp *ethpb.Checkpoint) (state.Be
 // AddCheckpointState adds CheckpointState object to the cache. This method also trims the least
 // recently added CheckpointState object if the cache size has ready the max cache size limit.
 func (c *CheckpointStateCache) AddCheckpointState(cp *ethpb.Checkpoint, s state.ReadOnlyBeaconState) error {
-	c.lock.Lock()
-	defer c.lock.Unlock()
 	h, err := hash.HashProto(cp)
 	if err != nil {
 		return err
--- a/beacon-chain/cache/depositsnapshot/BUILD.bazel
+++ b/beacon-chain/cache/depositsnapshot/BUILD.bazel
@@ -0,0 +1,8 @@
+load("@prysm//tools/go:def.bzl", "go_library")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["merkle_tree.go"],
+    importpath = "github.com/prysmaticlabs/prysm/v3/beacon-chain/cache/depositsnapshot",
+    visibility = ["//visibility:public"],
+)
--- a/beacon-chain/cache/depositsnapshot/merkle_tree.go
+++ b/beacon-chain/cache/depositsnapshot/merkle_tree.go
@@ -0,0 +1,19 @@
+package depositsnapshot
+
+const (
+	DepositContractDepth = 32 // Maximum tree depth as defined by EIP-4881.
+)
+
+// MerkleTreeNode is the interface for a Merkle tree.
+type MerkleTreeNode interface {
+	// GetRoot returns the root of the Merkle tree.
+	GetRoot() [32]byte
+	// IsFull returns whether there is space left for deposits.
+	IsFull() bool
+	// Finalize marks deposits of the Merkle tree as finalized.
+	Finalize(deposits uint, depth uint) MerkleTreeNode
+	// GetFinalized returns a list of hashes of all the finalized nodes and the number of deposits.
+	GetFinalized(result [][32]byte) ([][32]byte, uint)
+	// PushLeaf adds a new leaf node at the next available Zero node.
+	PushLeaf(leaf [32]byte, deposits uint, depth uint) MerkleTreeNode
+}
--- a/beacon-chain/cache/payload_id.go
+++ b/beacon-chain/cache/payload_id.go
@@ -57,7 +57,7 @@ func (f *ProposerPayloadIDsCache) SetProposerAndPayloadIDs(slot types.Slot, vId
 	ids, ok := f.slotToProposerAndPayloadIDs[k]
 	// Ok to overwrite if the slot is already set but the cached payload ID is not set.
 	// This combats the re-org case where payload assignment could change at the start of the epoch.
-	byte8 := [vIdLength]byte{}
+	var byte8 [vIdLength]byte
 	if !ok || (ok && bytes.Equal(ids[vIdLength:], byte8[:])) {
 		f.slotToProposerAndPayloadIDs[k] = bs
 	}
--- a/beacon-chain/cache/payload_id_test.go
+++ b/beacon-chain/cache/payload_id_test.go
@@ -9,7 +9,7 @@ import (

 func TestValidatorPayloadIDsCache_GetAndSaveValidatorPayloadIDs(t *testing.T) {
 	cache := NewProposerPayloadIDsCache()
-	r := [32]byte{}
+	var r [32]byte
 	i, p, ok := cache.GetProposerPayloadIDs(0, r)
 	require.Equal(t, false, ok)
 	require.Equal(t, types.ValidatorIndex(0), i)
--- a/beacon-chain/cache/sync_committee_head_state.go
+++ b/beacon-chain/cache/sync_committee_head_state.go
@@ -52,9 +52,8 @@ func (c *SyncCommitteeHeadStateCache) Get(slot types.Slot) (state.BeaconState, e
 	if !ok {
 		return nil, ErrIncorrectType
 	}
-	switch st.Version() {
-	case version.Altair, version.Bellatrix:
-	default:
+	// Sync committee is not supported in phase 0.
+	if st.Version() == version.Phase0 {
 		return nil, ErrIncorrectType
 	}
 	return st, nil
--- a/beacon-chain/cache/sync_committee_head_state_test.go
+++ b/beacon-chain/cache/sync_committee_head_state_test.go
@@ -33,6 +33,13 @@ func TestSyncCommitteeHeadState(t *testing.T) {
 		},
 	})
 	require.NoError(t, err)
+	capellaState, err := state_native.InitializeFromProtoCapella(&ethpb.BeaconStateCapella{
+		Fork: &ethpb.Fork{
+			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+		},
+	})
+	require.NoError(t, err)
 	type put struct {
 		slot  types.Slot
 		state state.BeaconState
@@ -106,6 +113,15 @@ func TestSyncCommitteeHeadState(t *testing.T) {
 			},
 			want: bellatrixState,
 		},
+		{
+			name: "found with key (capella state)",
+			key:  types.Slot(200),
+			put: &put{
+				slot:  types.Slot(200),
+				state: capellaState,
+			},
+			want: capellaState,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
--- a/beacon-chain/core/altair/BUILD.bazel
+++ b/beacon-chain/core/altair/BUILD.bazel
@@ -14,13 +14,7 @@ go_library(
        "upgrade.go",
    ],
    importpath = "github.com/prysmaticlabs/prysm/v3/beacon-chain/core/altair",
-    visibility = [
-        "//beacon-chain:__subpackages__",
-        "//testing/endtoend/evaluators:__subpackages__",
-        "//testing/spectest:__subpackages__",
-        "//testing/util:__pkg__",
-        "//validator/client:__pkg__",
-    ],
+    visibility = ["//visibility:public"],
    deps = [
        "//beacon-chain/core/blocks:go_default_library",
        "//beacon-chain/core/epoch:go_default_library",
@@ -58,6 +52,7 @@ go_test(
        "deposit_test.go",
        "epoch_precompute_test.go",
        "epoch_spec_test.go",
+        "exports_test.go",
        "reward_test.go",
        "sync_committee_test.go",
        "transition_test.go",
--- a/beacon-chain/core/altair/attestation.go
+++ b/beacon-chain/core/altair/attestation.go
@@ -82,23 +82,24 @@ func ProcessAttestationNoVerifySignature(
 // the proposer in state.
 //
 // Spec code:
-//     # Update epoch participation flags
-//    if data.target.epoch == get_current_epoch(state):
-//        epoch_participation = state.current_epoch_participation
-//    else:
-//        epoch_participation = state.previous_epoch_participation
 //
-//    proposer_reward_numerator = 0
-//    for index in get_attesting_indices(state, data, attestation.aggregation_bits):
-//        for flag_index, weight in enumerate(PARTICIPATION_FLAG_WEIGHTS):
-//            if flag_index in participation_flag_indices and not has_flag(epoch_participation[index], flag_index):
-//                epoch_participation[index] = add_flag(epoch_participation[index], flag_index)
-//                proposer_reward_numerator += get_base_reward(state, index) * weight
+//	 # Update epoch participation flags
+//	if data.target.epoch == get_current_epoch(state):
+//	    epoch_participation = state.current_epoch_participation
+//	else:
+//	    epoch_participation = state.previous_epoch_participation
 //
-//    # Reward proposer
-//    proposer_reward_denominator = (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT) * WEIGHT_DENOMINATOR // PROPOSER_WEIGHT
-//    proposer_reward = Gwei(proposer_reward_numerator // proposer_reward_denominator)
-//    increase_balance(state, get_beacon_proposer_index(state), proposer_reward)
+//	proposer_reward_numerator = 0
+//	for index in get_attesting_indices(state, data, attestation.aggregation_bits):
+//	    for flag_index, weight in enumerate(PARTICIPATION_FLAG_WEIGHTS):
+//	        if flag_index in participation_flag_indices and not has_flag(epoch_participation[index], flag_index):
+//	            epoch_participation[index] = add_flag(epoch_participation[index], flag_index)
+//	            proposer_reward_numerator += get_base_reward(state, index) * weight
+//
+//	# Reward proposer
+//	proposer_reward_denominator = (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT) * WEIGHT_DENOMINATOR // PROPOSER_WEIGHT
+//	proposer_reward = Gwei(proposer_reward_numerator // proposer_reward_denominator)
+//	increase_balance(state, get_beacon_proposer_index(state), proposer_reward)
 func SetParticipationAndRewardProposer(
 	ctx context.Context,
 	beaconState state.BeaconState,
@@ -157,12 +158,13 @@ func AddValidatorFlag(flag, flagPosition uint8) (uint8, error) {
 // EpochParticipation sets and returns the proposer reward numerator and epoch participation.
 //
 // Spec code:
-//    proposer_reward_numerator = 0
-//    for index in get_attesting_indices(state, data, attestation.aggregation_bits):
-//        for flag_index, weight in enumerate(PARTICIPATION_FLAG_WEIGHTS):
-//            if flag_index in participation_flag_indices and not has_flag(epoch_participation[index], flag_index):
-//                epoch_participation[index] = add_flag(epoch_participation[index], flag_index)
-//                proposer_reward_numerator += get_base_reward(state, index) * weight
+//
+//	proposer_reward_numerator = 0
+//	for index in get_attesting_indices(state, data, attestation.aggregation_bits):
+//	    for flag_index, weight in enumerate(PARTICIPATION_FLAG_WEIGHTS):
+//	        if flag_index in participation_flag_indices and not has_flag(epoch_participation[index], flag_index):
+//	            epoch_participation[index] = add_flag(epoch_participation[index], flag_index)
+//	            proposer_reward_numerator += get_base_reward(state, index) * weight
 func EpochParticipation(beaconState state.BeaconState, indices []uint64, epochParticipation []byte, participatedFlags map[uint8]bool, totalBalance uint64) (uint64, []byte, error) {
 	cfg := params.BeaconConfig()
 	sourceFlagIndex := cfg.TimelySourceFlagIndex
@@ -218,9 +220,10 @@ func EpochParticipation(beaconState state.BeaconState, indices []uint64, epochPa
 // RewardProposer rewards proposer by increasing proposer's balance with input reward numerator and calculated reward denominator.
 //
 // Spec code:
-//    proposer_reward_denominator = (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT) * WEIGHT_DENOMINATOR // PROPOSER_WEIGHT
-//    proposer_reward = Gwei(proposer_reward_numerator // proposer_reward_denominator)
-//    increase_balance(state, get_beacon_proposer_index(state), proposer_reward)
+//
+//	proposer_reward_denominator = (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT) * WEIGHT_DENOMINATOR // PROPOSER_WEIGHT
+//	proposer_reward = Gwei(proposer_reward_numerator // proposer_reward_denominator)
+//	increase_balance(state, get_beacon_proposer_index(state), proposer_reward)
 func RewardProposer(ctx context.Context, beaconState state.BeaconState, proposerRewardNumerator uint64) error {
 	cfg := params.BeaconConfig()
 	d := (cfg.WeightDenominator - cfg.ProposerWeight) * cfg.WeightDenominator / cfg.ProposerWeight
@@ -238,31 +241,32 @@ func RewardProposer(ctx context.Context, beaconState state.BeaconState, proposer
 //
 // Spec code:
 // def get_attestation_participation_flag_indices(state: BeaconState,
-//                                               data: AttestationData,
-//                                               inclusion_delay: uint64) -> Sequence[int]:
-//    """
-//    Return the flag indices that are satisfied by an attestation.
-//    """
-//    if data.target.epoch == get_current_epoch(state):
-//        justified_checkpoint = state.current_justified_checkpoint
-//    else:
-//        justified_checkpoint = state.previous_justified_checkpoint
 //
-//    # Matching roots
-//    is_matching_source = data.source == justified_checkpoint
-//    is_matching_target = is_matching_source and data.target.root == get_block_root(state, data.target.epoch)
-//    is_matching_head = is_matching_target and data.beacon_block_root == get_block_root_at_slot(state, data.slot)
-//    assert is_matching_source
+//	                                           data: AttestationData,
+//	                                           inclusion_delay: uint64) -> Sequence[int]:
+//	"""
+//	Return the flag indices that are satisfied by an attestation.
+//	"""
+//	if data.target.epoch == get_current_epoch(state):
+//	    justified_checkpoint = state.current_justified_checkpoint
+//	else:
+//	    justified_checkpoint = state.previous_justified_checkpoint
 //
-//    participation_flag_indices = []
-//    if is_matching_source and inclusion_delay <= integer_squareroot(SLOTS_PER_EPOCH):
-//        participation_flag_indices.append(TIMELY_SOURCE_FLAG_INDEX)
-//    if is_matching_target and inclusion_delay <= SLOTS_PER_EPOCH:
-//        participation_flag_indices.append(TIMELY_TARGET_FLAG_INDEX)
-//    if is_matching_head and inclusion_delay == MIN_ATTESTATION_INCLUSION_DELAY:
-//        participation_flag_indices.append(TIMELY_HEAD_FLAG_INDEX)
+//	# Matching roots
+//	is_matching_source = data.source == justified_checkpoint
+//	is_matching_target = is_matching_source and data.target.root == get_block_root(state, data.target.epoch)
+//	is_matching_head = is_matching_target and data.beacon_block_root == get_block_root_at_slot(state, data.slot)
+//	assert is_matching_source
 //
-//    return participation_flag_indices
+//	participation_flag_indices = []
+//	if is_matching_source and inclusion_delay <= integer_squareroot(SLOTS_PER_EPOCH):
+//	    participation_flag_indices.append(TIMELY_SOURCE_FLAG_INDEX)
+//	if is_matching_target and inclusion_delay <= SLOTS_PER_EPOCH:
+//	    participation_flag_indices.append(TIMELY_TARGET_FLAG_INDEX)
+//	if is_matching_head and inclusion_delay == MIN_ATTESTATION_INCLUSION_DELAY:
+//	    participation_flag_indices.append(TIMELY_HEAD_FLAG_INDEX)
+//
+//	return participation_flag_indices
 func AttestationParticipationFlagIndices(beaconState state.BeaconState, data *ethpb.AttestationData, delay types.Slot) (map[uint8]bool, error) {
 	currEpoch := time.CurrentEpoch(beaconState)
 	var justifiedCheckpt *ethpb.Checkpoint
@@ -304,9 +308,10 @@ func AttestationParticipationFlagIndices(beaconState state.BeaconState, data *et
 // MatchingStatus returns the matching statues for attestation data's source target and head.
 //
 // Spec code:
-//    is_matching_source = data.source == justified_checkpoint
-//    is_matching_target = is_matching_source and data.target.root == get_block_root(state, data.target.epoch)
-//    is_matching_head = is_matching_target and data.beacon_block_root == get_block_root_at_slot(state, data.slot)
+//
+//	is_matching_source = data.source == justified_checkpoint
+//	is_matching_target = is_matching_source and data.target.root == get_block_root(state, data.target.epoch)
+//	is_matching_head = is_matching_target and data.beacon_block_root == get_block_root_at_slot(state, data.slot)
 func MatchingStatus(beaconState state.BeaconState, data *ethpb.AttestationData, cp *ethpb.Checkpoint) (matchedSrc, matchedTgt, matchedHead bool, err error) {
 	matchedSrc = attestation.CheckPointIsEqual(data.Source, cp)

--- a/beacon-chain/core/altair/attestation_test.go
+++ b/beacon-chain/core/altair/attestation_test.go
@@ -256,7 +256,7 @@ func TestProcessAttestationNoVerify_SourceTargetHead(t *testing.T) {
 		},
 		AggregationBits: aggBits,
 	}
-	zeroSig := [96]byte{}
+	var zeroSig [96]byte
 	att.Signature = zeroSig[:]

 	ckp := beaconState.CurrentJustifiedCheckpoint()
--- a/beacon-chain/core/altair/block.go
+++ b/beacon-chain/core/altair/block.go
@@ -9,7 +9,6 @@ import (
 	p2pType "github.com/prysmaticlabs/prysm/v3/beacon-chain/p2p/types"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/crypto/bls"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
@@ -20,32 +19,33 @@ import (
 //
 // Spec code:
 // def process_sync_aggregate(state: BeaconState, sync_aggregate: SyncAggregate) -> None:
-//    # Verify sync committee aggregate signature signing over the previous slot block root
-//    committee_pubkeys = state.current_sync_committee.pubkeys
-//    participant_pubkeys = [pubkey for pubkey, bit in zip(committee_pubkeys, sync_aggregate.sync_committee_bits) if bit]
-//    previous_slot = max(state.slot, Slot(1)) - Slot(1)
-//    domain = get_domain(state, DOMAIN_SYNC_COMMITTEE, compute_epoch_at_slot(previous_slot))
-//    signing_root = compute_signing_root(get_block_root_at_slot(state, previous_slot), domain)
-//    assert eth2_fast_aggregate_verify(participant_pubkeys, signing_root, sync_aggregate.sync_committee_signature)
 //
-//    # Compute participant and proposer rewards
-//    total_active_increments = get_total_active_balance(state) // EFFECTIVE_BALANCE_INCREMENT
-//    total_base_rewards = Gwei(get_base_reward_per_increment(state) * total_active_increments)
-//    max_participant_rewards = Gwei(total_base_rewards * SYNC_REWARD_WEIGHT // WEIGHT_DENOMINATOR // SLOTS_PER_EPOCH)
-//    participant_reward = Gwei(max_participant_rewards // SYNC_COMMITTEE_SIZE)
-//    proposer_reward = Gwei(participant_reward * PROPOSER_WEIGHT // (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT))
+//	# Verify sync committee aggregate signature signing over the previous slot block root
+//	committee_pubkeys = state.current_sync_committee.pubkeys
+//	participant_pubkeys = [pubkey for pubkey, bit in zip(committee_pubkeys, sync_aggregate.sync_committee_bits) if bit]
+//	previous_slot = max(state.slot, Slot(1)) - Slot(1)
+//	domain = get_domain(state, DOMAIN_SYNC_COMMITTEE, compute_epoch_at_slot(previous_slot))
+//	signing_root = compute_signing_root(get_block_root_at_slot(state, previous_slot), domain)
+//	assert eth2_fast_aggregate_verify(participant_pubkeys, signing_root, sync_aggregate.sync_committee_signature)
 //
-//    # Apply participant and proposer rewards
-//    all_pubkeys = [v.pubkey for v in state.validators]
-//    committee_indices = [ValidatorIndex(all_pubkeys.index(pubkey)) for pubkey in state.current_sync_committee.pubkeys]
-//    for participant_index, participation_bit in zip(committee_indices, sync_aggregate.sync_committee_bits):
-//        if participation_bit:
-//            increase_balance(state, participant_index, participant_reward)
-//            increase_balance(state, get_beacon_proposer_index(state), proposer_reward)
-//        else:
-//            decrease_balance(state, participant_index, participant_reward)
+//	# Compute participant and proposer rewards
+//	total_active_increments = get_total_active_balance(state) // EFFECTIVE_BALANCE_INCREMENT
+//	total_base_rewards = Gwei(get_base_reward_per_increment(state) * total_active_increments)
+//	max_participant_rewards = Gwei(total_base_rewards * SYNC_REWARD_WEIGHT // WEIGHT_DENOMINATOR // SLOTS_PER_EPOCH)
+//	participant_reward = Gwei(max_participant_rewards // SYNC_COMMITTEE_SIZE)
+//	proposer_reward = Gwei(participant_reward * PROPOSER_WEIGHT // (WEIGHT_DENOMINATOR - PROPOSER_WEIGHT))
+//
+//	# Apply participant and proposer rewards
+//	all_pubkeys = [v.pubkey for v in state.validators]
+//	committee_indices = [ValidatorIndex(all_pubkeys.index(pubkey)) for pubkey in state.current_sync_committee.pubkeys]
+//	for participant_index, participation_bit in zip(committee_indices, sync_aggregate.sync_committee_bits):
+//	    if participation_bit:
+//	        increase_balance(state, participant_index, participant_reward)
+//	        increase_balance(state, get_beacon_proposer_index(state), proposer_reward)
+//	    else:
+//	        decrease_balance(state, participant_index, participant_reward)
 func ProcessSyncAggregate(ctx context.Context, s state.BeaconState, sync *ethpb.SyncAggregate) (state.BeaconState, error) {
-	votedKeys, votedIndices, didntVoteIndices, err := FilterSyncCommitteeVotes(s, sync)
+	s, votedKeys, err := processSyncAggregate(ctx, s, sync)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not filter sync committee votes")
 	}
@@ -53,50 +53,70 @@ func ProcessSyncAggregate(ctx context.Context, s state.BeaconState, sync *ethpb.
 	if err := VerifySyncCommitteeSig(s, votedKeys, sync.SyncCommitteeSignature); err != nil {
 		return nil, errors.Wrap(err, "could not verify sync committee signature")
 	}
-
-	return ApplySyncRewardsPenalties(ctx, s, votedIndices, didntVoteIndices)
+	return s, nil
 }

-// FilterSyncCommitteeVotes filters the validator public keys and indices for the ones that voted and didn't vote.
-func FilterSyncCommitteeVotes(s state.BeaconState, sync *ethpb.SyncAggregate) (
-	votedKeys []bls.PublicKey,
-	votedIndices []types.ValidatorIndex,
-	didntVoteIndices []types.ValidatorIndex,
-	err error) {
+// processSyncAggregate applies all the logic in the spec function `process_sync_aggregate` except
+// verifying the BLS signatures. It returns the modified beacons state and the list of validators'
+// public keys that voted, for future signature verification.
+func processSyncAggregate(ctx context.Context, s state.BeaconState, sync *ethpb.SyncAggregate) (
+	state.BeaconState,
+	[]bls.PublicKey,
+	error) {
 	currentSyncCommittee, err := s.CurrentSyncCommittee()
 	if err != nil {
-		return nil, nil, nil, err
+		return nil, nil, err
 	}
 	if currentSyncCommittee == nil {
-		return nil, nil, nil, errors.New("nil current sync committee in state")
+		return nil, nil, errors.New("nil current sync committee in state")
 	}
 	committeeKeys := currentSyncCommittee.Pubkeys
 	if sync.SyncCommitteeBits.Len() > uint64(len(committeeKeys)) {
-		return nil, nil, nil, errors.New("bits length exceeds committee length")
+		return nil, nil, errors.New("bits length exceeds committee length")
 	}
-	votedKeys = make([]bls.PublicKey, 0, len(committeeKeys))
-	votedIndices = make([]types.ValidatorIndex, 0, len(committeeKeys))
-	didntVoteIndices = make([]types.ValidatorIndex, 0) // No allocation. Expect most votes.
+	votedKeys := make([]bls.PublicKey, 0, len(committeeKeys))

+	activeBalance, err := helpers.TotalActiveBalance(s)
+	if err != nil {
+		return nil, nil, err
+	}
+	proposerReward, participantReward, err := SyncRewards(activeBalance)
+	if err != nil {
+		return nil, nil, err
+	}
+	proposerIndex, err := helpers.BeaconProposerIndex(ctx, s)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	earnedProposerReward := uint64(0)
 	for i := uint64(0); i < sync.SyncCommitteeBits.Len(); i++ {
 		vIdx, exists := s.ValidatorIndexByPubkey(bytesutil.ToBytes48(committeeKeys[i]))
 		// Impossible scenario.
 		if !exists {
-			return nil, nil, nil, errors.New("validator public key does not exist in state")
+			return nil, nil, errors.New("validator public key does not exist in state")
 		}

 		if sync.SyncCommitteeBits.BitAt(i) {
 			pubKey, err := bls.PublicKeyFromBytes(committeeKeys[i])
 			if err != nil {
-				return nil, nil, nil, err
+				return nil, nil, err
 			}
 			votedKeys = append(votedKeys, pubKey)
-			votedIndices = append(votedIndices, vIdx)
+			if err := helpers.IncreaseBalance(s, vIdx, participantReward); err != nil {
+				return nil, nil, err
+			}
+			earnedProposerReward += proposerReward
 		} else {
-			didntVoteIndices = append(didntVoteIndices, vIdx)
+			if err := helpers.DecreaseBalance(s, vIdx, participantReward); err != nil {
+				return nil, nil, err
+			}
 		}
 	}
-	return
+	if err := helpers.IncreaseBalance(s, proposerIndex, earnedProposerReward); err != nil {
+		return nil, nil, err
+	}
+	return s, votedKeys, err
 }

 // VerifySyncCommitteeSig verifies sync committee signature `syncSig` is valid with respect to public keys `syncKeys`.
@@ -125,43 +145,6 @@ func VerifySyncCommitteeSig(s state.BeaconState, syncKeys []bls.PublicKey, syncS
 	return nil
 }

-// ApplySyncRewardsPenalties applies rewards and penalties for proposer and sync committee participants.
-func ApplySyncRewardsPenalties(ctx context.Context, s state.BeaconState, votedIndices, didntVoteIndices []types.ValidatorIndex) (state.BeaconState, error) {
-	activeBalance, err := helpers.TotalActiveBalance(s)
-	if err != nil {
-		return nil, err
-	}
-	proposerReward, participantReward, err := SyncRewards(activeBalance)
-	if err != nil {
-		return nil, err
-	}
-
-	// Apply sync committee rewards.
-	earnedProposerReward := uint64(0)
-	for _, index := range votedIndices {
-		if err := helpers.IncreaseBalance(s, index, participantReward); err != nil {
-			return nil, err
-		}
-		earnedProposerReward += proposerReward
-	}
-	// Apply proposer rewards.
-	proposerIndex, err := helpers.BeaconProposerIndex(ctx, s)
-	if err != nil {
-		return nil, err
-	}
-	if err := helpers.IncreaseBalance(s, proposerIndex, earnedProposerReward); err != nil {
-		return nil, err
-	}
-	// Apply sync committee penalties.
-	for _, index := range didntVoteIndices {
-		if err := helpers.DecreaseBalance(s, index, participantReward); err != nil {
-			return nil, err
-		}
-	}
-
-	return s, nil
-}
-
 // SyncRewards returns the proposer reward and the sync participant reward given the total active balance in state.
 func SyncRewards(activeBalance uint64) (proposerReward, participantReward uint64, err error) {
 	cfg := params.BeaconConfig()
--- a/beacon-chain/core/altair/block_test.go
+++ b/beacon-chain/core/altair/block_test.go
@@ -168,7 +168,36 @@ func TestProcessSyncCommittee_MixParticipation_GoodSignature(t *testing.T) {
 	require.NoError(t, err)
 }

-func TestProcessSyncCommittee_FilterSyncCommitteeVotes(t *testing.T) {
+// This is a regression test #11696
+func TestProcessSyncCommittee_DontPrecompute(t *testing.T) {
+	beaconState, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().MaxValidatorsPerCommittee)
+	require.NoError(t, beaconState.SetSlot(1))
+	committee, err := altair.NextSyncCommittee(context.Background(), beaconState)
+	require.NoError(t, err)
+	committeeKeys := committee.Pubkeys
+	committeeKeys[1] = committeeKeys[0]
+	require.NoError(t, beaconState.SetCurrentSyncCommittee(committee))
+	idx, ok := beaconState.ValidatorIndexByPubkey(bytesutil.ToBytes48(committeeKeys[0]))
+	require.Equal(t, true, ok)
+
+	syncBits := bitfield.NewBitvector512()
+	for i := range syncBits {
+		syncBits[i] = 0xFF
+	}
+	syncBits.SetBitAt(0, false)
+	syncAggregate := &ethpb.SyncAggregate{
+		SyncCommitteeBits: syncBits,
+	}
+	require.NoError(t, beaconState.UpdateBalancesAtIndex(idx, 0))
+	st, votedKeys, err := altair.ProcessSyncAggregateEported(context.Background(), beaconState, syncAggregate)
+	require.NoError(t, err)
+	require.Equal(t, 511, len(votedKeys))
+	require.DeepEqual(t, committeeKeys[0], votedKeys[0].Marshal())
+	balances := st.Balances()
+	require.Equal(t, uint64(988), balances[idx])
+}
+
+func TestProcessSyncCommittee_processSyncAggregate(t *testing.T) {
 	beaconState, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().MaxValidatorsPerCommittee)
 	require.NoError(t, beaconState.SetSlot(1))
 	committee, err := altair.NextSyncCommittee(context.Background(), beaconState)
@@ -183,25 +212,40 @@ func TestProcessSyncCommittee_FilterSyncCommitteeVotes(t *testing.T) {
 		SyncCommitteeBits: syncBits,
 	}

-	votedKeys, votedIndices, didntVoteIndices, err := altair.FilterSyncCommitteeVotes(beaconState, syncAggregate)
+	st, votedKeys, err := altair.ProcessSyncAggregateEported(context.Background(), beaconState, syncAggregate)
 	require.NoError(t, err)
 	votedMap := make(map[[fieldparams.BLSPubkeyLength]byte]bool)
 	for _, key := range votedKeys {
 		votedMap[bytesutil.ToBytes48(key.Marshal())] = true
 	}
 	require.Equal(t, int(syncBits.Len()/2), len(votedKeys))
-	require.Equal(t, int(syncBits.Len()/2), len(votedIndices))
-	require.Equal(t, int(syncBits.Len()/2), len(didntVoteIndices))
+
+	currentSyncCommittee, err := st.CurrentSyncCommittee()
+	require.NoError(t, err)
+	committeeKeys := currentSyncCommittee.Pubkeys
+	balances := st.Balances()
+
+	proposerIndex, err := helpers.BeaconProposerIndex(context.Background(), beaconState)
+	require.NoError(t, err)

 	for i := 0; i < len(syncBits); i++ {
 		if syncBits.BitAt(uint64(i)) {
-			pk := beaconState.PubkeyAtIndex(votedIndices[i])
+			pk := bytesutil.ToBytes48(committeeKeys[i])
 			require.DeepEqual(t, true, votedMap[pk])
+			idx, ok := st.ValidatorIndexByPubkey(pk)
+			require.Equal(t, true, ok)
+			require.Equal(t, uint64(32000000988), balances[idx])
 		} else {
-			pk := beaconState.PubkeyAtIndex(didntVoteIndices[i])
+			pk := bytesutil.ToBytes48(committeeKeys[i])
 			require.DeepEqual(t, false, votedMap[pk])
+			idx, ok := st.ValidatorIndexByPubkey(pk)
+			require.Equal(t, true, ok)
+			if idx != proposerIndex {
+				require.Equal(t, uint64(31999999012), balances[idx])
+			}
 		}
 	}
+	require.Equal(t, uint64(32000035108), balances[proposerIndex])
 }

 func Test_VerifySyncCommitteeSig(t *testing.T) {
@@ -240,22 +284,6 @@ func Test_VerifySyncCommitteeSig(t *testing.T) {
 	require.NoError(t, altair.VerifySyncCommitteeSig(beaconState, pks, aggregatedSig))
 }

-func Test_ApplySyncRewardsPenalties(t *testing.T) {
-	beaconState, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().MaxValidatorsPerCommittee)
-	beaconState, err := altair.ApplySyncRewardsPenalties(context.Background(), beaconState,
-		[]types.ValidatorIndex{0, 1}, // voted
-		[]types.ValidatorIndex{2, 3}) // didn't vote
-	require.NoError(t, err)
-	balances := beaconState.Balances()
-	require.Equal(t, uint64(32000000988), balances[0])
-	require.Equal(t, balances[0], balances[1])
-	require.Equal(t, uint64(31999999012), balances[2])
-	require.Equal(t, balances[2], balances[3])
-	proposerIndex, err := helpers.BeaconProposerIndex(context.Background(), beaconState)
-	require.NoError(t, err)
-	require.Equal(t, uint64(32000000282), balances[proposerIndex])
-}
-
 func Test_SyncRewards(t *testing.T) {
 	tests := []struct {
 		name                  string
--- a/beacon-chain/core/altair/epoch_precompute.go
+++ b/beacon-chain/core/altair/epoch_precompute.go
@@ -68,9 +68,10 @@ func InitializePrecomputeValidators(ctx context.Context, beaconState state.Beaco
 // For fully inactive validators and perfect active validators, the effect is the same as before Altair.
 // For a validator is inactive and the chain fails to finalize, the inactivity score increases by a fixed number, the total loss after N epochs is proportional to N**2/2.
 // For imperfectly active validators. The inactivity score's behavior is specified by this function:
-//    If a validator fails to submit an attestation with the correct target, their inactivity score goes up by 4.
-//    If they successfully submit an attestation with the correct source and target, their inactivity score drops by 1
-//    If the chain has recently finalized, each validator's score drops by 16.
+//
+//	If a validator fails to submit an attestation with the correct target, their inactivity score goes up by 4.
+//	If they successfully submit an attestation with the correct source and target, their inactivity score drops by 1
+//	If the chain has recently finalized, each validator's score drops by 16.
 func ProcessInactivityScores(
 	ctx context.Context,
 	beaconState state.BeaconState,
@@ -132,12 +133,13 @@ func ProcessInactivityScores(
 // it also tracks and updates epoch attesting balances.
 // Spec code:
 // if epoch == get_current_epoch(state):
-//        epoch_participation = state.current_epoch_participation
-//    else:
-//        epoch_participation = state.previous_epoch_participation
-//    active_validator_indices = get_active_validator_indices(state, epoch)
-//    participating_indices = [i for i in active_validator_indices if has_flag(epoch_participation[i], flag_index)]
-//    return set(filter(lambda index: not state.validators[index].slashed, participating_indices))
+//
+//	    epoch_participation = state.current_epoch_participation
+//	else:
+//	    epoch_participation = state.previous_epoch_participation
+//	active_validator_indices = get_active_validator_indices(state, epoch)
+//	participating_indices = [i for i in active_validator_indices if has_flag(epoch_participation[i], flag_index)]
+//	return set(filter(lambda index: not state.validators[index].slashed, participating_indices))
 func ProcessEpochParticipation(
 	ctx context.Context,
 	beaconState state.BeaconState,
--- a/beacon-chain/core/altair/epoch_spec.go
+++ b/beacon-chain/core/altair/epoch_spec.go
@@ -14,10 +14,11 @@ import (
 //
 // Spec code:
 // def process_sync_committee_updates(state: BeaconState) -> None:
-//    next_epoch = get_current_epoch(state) + Epoch(1)
-//    if next_epoch % EPOCHS_PER_SYNC_COMMITTEE_PERIOD == 0:
-//        state.current_sync_committee = state.next_sync_committee
-//        state.next_sync_committee = get_next_sync_committee(state)
+//
+//	next_epoch = get_current_epoch(state) + Epoch(1)
+//	if next_epoch % EPOCHS_PER_SYNC_COMMITTEE_PERIOD == 0:
+//	    state.current_sync_committee = state.next_sync_committee
+//	    state.next_sync_committee = get_next_sync_committee(state)
 func ProcessSyncCommitteeUpdates(ctx context.Context, beaconState state.BeaconState) (state.BeaconState, error) {
 	nextEpoch := time.NextEpoch(beaconState)
 	if nextEpoch%params.BeaconConfig().EpochsPerSyncCommitteePeriod == 0 {
@@ -46,8 +47,9 @@ func ProcessSyncCommitteeUpdates(ctx context.Context, beaconState state.BeaconSt
 //
 // Spec code:
 // def process_participation_flag_updates(state: BeaconState) -> None:
-//    state.previous_epoch_participation = state.current_epoch_participation
-//    state.current_epoch_participation = [ParticipationFlags(0b0000_0000) for _ in range(len(state.validators))]
+//
+//	state.previous_epoch_participation = state.current_epoch_participation
+//	state.current_epoch_participation = [ParticipationFlags(0b0000_0000) for _ in range(len(state.validators))]
 func ProcessParticipationFlagUpdates(beaconState state.BeaconState) (state.BeaconState, error) {
 	c, err := beaconState.CurrentEpochParticipation()
 	if err != nil {
--- a/beacon-chain/core/altair/exports_test.go
+++ b/beacon-chain/core/altair/exports_test.go
@@ -0,0 +1,3 @@
+package altair
+
+var ProcessSyncAggregateEported = processSyncAggregate
--- a/beacon-chain/core/altair/reward.go
+++ b/beacon-chain/core/altair/reward.go
@@ -13,16 +13,17 @@ import (
 // individual validator's base reward.
 //
 // Spec code:
-//  def get_base_reward(state: BeaconState, index: ValidatorIndex) -> Gwei:
-//    """
-//    Return the base reward for the validator defined by ``index`` with respect to the current ``state``.
 //
-//    Note: An optimally performing validator can earn one base reward per epoch over a long time horizon.
-//    This takes into account both per-epoch (e.g. attestation) and intermittent duties (e.g. block proposal
-//    and sync committees).
-//    """
-//    increments = state.validators[index].effective_balance // EFFECTIVE_BALANCE_INCREMENT
-//    return Gwei(increments * get_base_reward_per_increment(state))
+//	def get_base_reward(state: BeaconState, index: ValidatorIndex) -> Gwei:
+//	  """
+//	  Return the base reward for the validator defined by ``index`` with respect to the current ``state``.
+//
+//	  Note: An optimally performing validator can earn one base reward per epoch over a long time horizon.
+//	  This takes into account both per-epoch (e.g. attestation) and intermittent duties (e.g. block proposal
+//	  and sync committees).
+//	  """
+//	  increments = state.validators[index].effective_balance // EFFECTIVE_BALANCE_INCREMENT
+//	  return Gwei(increments * get_base_reward_per_increment(state))
 func BaseReward(s state.ReadOnlyBeaconState, index types.ValidatorIndex) (uint64, error) {
 	totalBalance, err := helpers.TotalActiveBalance(s)
 	if err != nil {
@@ -50,7 +51,8 @@ func BaseRewardWithTotalBalance(s state.ReadOnlyBeaconState, index types.Validat
 //
 // Spec code:
 // def get_base_reward_per_increment(state: BeaconState) -> Gwei:
-//    return Gwei(EFFECTIVE_BALANCE_INCREMENT * BASE_REWARD_FACTOR // integer_squareroot(get_total_active_balance(state)))
+//
+//	return Gwei(EFFECTIVE_BALANCE_INCREMENT * BASE_REWARD_FACTOR // integer_squareroot(get_total_active_balance(state)))
 func BaseRewardPerIncrement(activeBalance uint64) (uint64, error) {
 	if activeBalance == 0 {
 		return 0, errors.New("active balance can't be 0")
--- a/beacon-chain/core/altair/sync_committee.go
+++ b/beacon-chain/core/altair/sync_committee.go
@@ -47,13 +47,14 @@ func ValidateNilSyncContribution(s *ethpb.SignedContributionAndProof) error {
 //
 // Spec code:
 // def get_next_sync_committee(state: BeaconState) -> SyncCommittee:
-//    """
-//    Return the next sync committee, with possible pubkey duplicates.
-//    """
-//    indices = get_next_sync_committee_indices(state)
-//    pubkeys = [state.validators[index].pubkey for index in indices]
-//    aggregate_pubkey = bls.AggregatePKs(pubkeys)
-//    return SyncCommittee(pubkeys=pubkeys, aggregate_pubkey=aggregate_pubkey)
+//
+//	"""
+//	Return the next sync committee, with possible pubkey duplicates.
+//	"""
+//	indices = get_next_sync_committee_indices(state)
+//	pubkeys = [state.validators[index].pubkey for index in indices]
+//	aggregate_pubkey = bls.AggregatePKs(pubkeys)
+//	return SyncCommittee(pubkeys=pubkeys, aggregate_pubkey=aggregate_pubkey)
 func NextSyncCommittee(ctx context.Context, s state.BeaconState) (*ethpb.SyncCommittee, error) {
 	indices, err := NextSyncCommitteeIndices(ctx, s)
 	if err != nil {
@@ -78,26 +79,27 @@ func NextSyncCommittee(ctx context.Context, s state.BeaconState) (*ethpb.SyncCom
 //
 // Spec code:
 // def get_next_sync_committee_indices(state: BeaconState) -> Sequence[ValidatorIndex]:
-//    """
-//    Return the sync committee indices, with possible duplicates, for the next sync committee.
-//    """
-//    epoch = Epoch(get_current_epoch(state) + 1)
 //
-//    MAX_RANDOM_BYTE = 2**8 - 1
-//    active_validator_indices = get_active_validator_indices(state, epoch)
-//    active_validator_count = uint64(len(active_validator_indices))
-//    seed = get_seed(state, epoch, DOMAIN_SYNC_COMMITTEE)
-//    i = 0
-//    sync_committee_indices: List[ValidatorIndex] = []
-//    while len(sync_committee_indices) < SYNC_COMMITTEE_SIZE:
-//        shuffled_index = compute_shuffled_index(uint64(i % active_validator_count), active_validator_count, seed)
-//        candidate_index = active_validator_indices[shuffled_index]
-//        random_byte = hash(seed + uint_to_bytes(uint64(i // 32)))[i % 32]
-//        effective_balance = state.validators[candidate_index].effective_balance
-//        if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE * random_byte:
-//            sync_committee_indices.append(candidate_index)
-//        i += 1
-//    return sync_committee_indices
+//	"""
+//	Return the sync committee indices, with possible duplicates, for the next sync committee.
+//	"""
+//	epoch = Epoch(get_current_epoch(state) + 1)
+//
+//	MAX_RANDOM_BYTE = 2**8 - 1
+//	active_validator_indices = get_active_validator_indices(state, epoch)
+//	active_validator_count = uint64(len(active_validator_indices))
+//	seed = get_seed(state, epoch, DOMAIN_SYNC_COMMITTEE)
+//	i = 0
+//	sync_committee_indices: List[ValidatorIndex] = []
+//	while len(sync_committee_indices) < SYNC_COMMITTEE_SIZE:
+//	    shuffled_index = compute_shuffled_index(uint64(i % active_validator_count), active_validator_count, seed)
+//	    candidate_index = active_validator_indices[shuffled_index]
+//	    random_byte = hash(seed + uint_to_bytes(uint64(i // 32)))[i % 32]
+//	    effective_balance = state.validators[candidate_index].effective_balance
+//	    if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE * random_byte:
+//	        sync_committee_indices.append(candidate_index)
+//	    i += 1
+//	return sync_committee_indices
 func NextSyncCommitteeIndices(ctx context.Context, s state.BeaconState) ([]types.ValidatorIndex, error) {
 	epoch := coreTime.NextEpoch(s)
 	indices, err := helpers.ActiveValidatorIndices(ctx, s, epoch)
@@ -144,18 +146,19 @@ func NextSyncCommitteeIndices(ctx context.Context, s state.BeaconState) ([]types
 // SyncSubCommitteePubkeys returns the pubkeys participating in a sync subcommittee.
 //
 // def get_sync_subcommittee_pubkeys(state: BeaconState, subcommittee_index: uint64) -> Sequence[BLSPubkey]:
-//    # Committees assigned to `slot` sign for `slot - 1`
-//    # This creates the exceptional logic below when transitioning between sync committee periods
-//    next_slot_epoch = compute_epoch_at_slot(Slot(state.slot + 1))
-//    if compute_sync_committee_period(get_current_epoch(state)) == compute_sync_committee_period(next_slot_epoch):
-//        sync_committee = state.current_sync_committee
-//    else:
-//        sync_committee = state.next_sync_committee
 //
-//    # Return pubkeys for the subcommittee index
-//    sync_subcommittee_size = SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT
-//    i = subcommittee_index * sync_subcommittee_size
-//    return sync_committee.pubkeys[i:i + sync_subcommittee_size]
+//	# Committees assigned to `slot` sign for `slot - 1`
+//	# This creates the exceptional logic below when transitioning between sync committee periods
+//	next_slot_epoch = compute_epoch_at_slot(Slot(state.slot + 1))
+//	if compute_sync_committee_period(get_current_epoch(state)) == compute_sync_committee_period(next_slot_epoch):
+//	    sync_committee = state.current_sync_committee
+//	else:
+//	    sync_committee = state.next_sync_committee
+//
+//	# Return pubkeys for the subcommittee index
+//	sync_subcommittee_size = SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT
+//	i = subcommittee_index * sync_subcommittee_size
+//	return sync_committee.pubkeys[i:i + sync_subcommittee_size]
 func SyncSubCommitteePubkeys(syncCommittee *ethpb.SyncCommittee, subComIdx types.CommitteeIndex) ([][]byte, error) {
 	cfg := params.BeaconConfig()
 	subCommSize := cfg.SyncCommitteeSize / cfg.SyncCommitteeSubnetCount
@@ -172,8 +175,9 @@ func SyncSubCommitteePubkeys(syncCommittee *ethpb.SyncCommittee, subComIdx types
 // aggregator.
 //
 // def is_sync_committee_aggregator(signature: BLSSignature) -> bool:
-//    modulo = max(1, SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT // TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE)
-//    return bytes_to_uint64(hash(signature)[0:8]) % modulo == 0
+//
+//	modulo = max(1, SYNC_COMMITTEE_SIZE // SYNC_COMMITTEE_SUBNET_COUNT // TARGET_AGGREGATORS_PER_SYNC_SUBCOMMITTEE)
+//	return bytes_to_uint64(hash(signature)[0:8]) % modulo == 0
 func IsSyncCommitteeAggregator(sig []byte) (bool, error) {
 	if len(sig) != fieldparams.BLSSignatureLength {
 		return false, errors.New("incorrect sig length")
--- a/beacon-chain/core/altair/transition.go
+++ b/beacon-chain/core/altair/transition.go
@@ -15,18 +15,19 @@ import (
 //
 // Spec code:
 // def process_epoch(state: BeaconState) -> None:
-//    process_justification_and_finalization(state)  # [Modified in Altair]
-//    process_inactivity_updates(state)  # [New in Altair]
-//    process_rewards_and_penalties(state)  # [Modified in Altair]
-//    process_registry_updates(state)
-//    process_slashings(state)  # [Modified in Altair]
-//    process_eth1_data_reset(state)
-//    process_effective_balance_updates(state)
-//    process_slashings_reset(state)
-//    process_randao_mixes_reset(state)
-//    process_historical_roots_update(state)
-//    process_participation_flag_updates(state)  # [New in Altair]
-//    process_sync_committee_updates(state)  # [New in Altair]
+//
+//	process_justification_and_finalization(state)  # [Modified in Altair]
+//	process_inactivity_updates(state)  # [New in Altair]
+//	process_rewards_and_penalties(state)  # [Modified in Altair]
+//	process_registry_updates(state)
+//	process_slashings(state)  # [Modified in Altair]
+//	process_eth1_data_reset(state)
+//	process_effective_balance_updates(state)
+//	process_slashings_reset(state)
+//	process_randao_mixes_reset(state)
+//	process_historical_roots_update(state)
+//	process_participation_flag_updates(state)  # [New in Altair]
+//	process_sync_committee_updates(state)  # [New in Altair]
 func ProcessEpoch(ctx context.Context, state state.BeaconState) (state.BeaconState, error) {
 	ctx, span := trace.StartSpan(ctx, "altair.ProcessEpoch")
 	defer span.End()
@@ -92,7 +93,7 @@ func ProcessEpoch(ctx context.Context, state state.BeaconState) (state.BeaconSta
 	if err != nil {
 		return nil, err
 	}
-	state, err = e.ProcessHistoricalRootsUpdate(state)
+	state, err = e.ProcessHistoricalDataUpdate(state)
 	if err != nil {
 		return nil, err
 	}
--- a/beacon-chain/core/altair/upgrade.go
+++ b/beacon-chain/core/altair/upgrade.go
@@ -16,56 +16,61 @@ import (
 //
 // Spec code:
 // def upgrade_to_altair(pre: phase0.BeaconState) -> BeaconState:
-//    epoch = phase0.get_current_epoch(pre)
-//    post = BeaconState(
-//        # Versioning
-//        genesis_time=pre.genesis_time,
-//        genesis_validators_root=pre.genesis_validators_root,
-//        slot=pre.slot,
-//        fork=Fork(
-//            previous_version=pre.fork.current_version,
-//            current_version=ALTAIR_FORK_VERSION,
-//            epoch=epoch,
-//        ),
-//        # History
-//        latest_block_header=pre.latest_block_header,
-//        block_roots=pre.block_roots,
-//        state_roots=pre.state_roots,
-//        historical_roots=pre.historical_roots,
-//        # Eth1
-//        eth1_data=pre.eth1_data,
-//        eth1_data_votes=pre.eth1_data_votes,
-//        eth1_deposit_index=pre.eth1_deposit_index,
-//        # Registry
-//        validators=pre.validators,
-//        balances=pre.balances,
-//        # Randomness
-//        randao_mixes=pre.randao_mixes,
-//        # Slashings
-//        slashings=pre.slashings,
-//        # Participation
-//        previous_epoch_participation=[ParticipationFlags(0b0000_0000) for _ in range(len(pre.validators))],
-//        current_epoch_participation=[ParticipationFlags(0b0000_0000) for _ in range(len(pre.validators))],
-//        # Finality
-//        justification_bits=pre.justification_bits,
-//        previous_justified_checkpoint=pre.previous_justified_checkpoint,
-//        current_justified_checkpoint=pre.current_justified_checkpoint,
-//        finalized_checkpoint=pre.finalized_checkpoint,
-//        # Inactivity
-//        inactivity_scores=[uint64(0) for _ in range(len(pre.validators))],
-//    )
-//    # Fill in previous epoch participation from the pre state's pending attestations
-//    translate_participation(post, pre.previous_epoch_attestations)
 //
-//    # Fill in sync committees
-//    # Note: A duplicate committee is assigned for the current and next committee at the fork boundary
-//    post.current_sync_committee = get_next_sync_committee(post)
-//    post.next_sync_committee = get_next_sync_committee(post)
-//    return post
+//	epoch = phase0.get_current_epoch(pre)
+//	post = BeaconState(
+//	    # Versioning
+//	    genesis_time=pre.genesis_time,
+//	    genesis_validators_root=pre.genesis_validators_root,
+//	    slot=pre.slot,
+//	    fork=Fork(
+//	        previous_version=pre.fork.current_version,
+//	        current_version=ALTAIR_FORK_VERSION,
+//	        epoch=epoch,
+//	    ),
+//	    # History
+//	    latest_block_header=pre.latest_block_header,
+//	    block_roots=pre.block_roots,
+//	    state_roots=pre.state_roots,
+//	    historical_roots=pre.historical_roots,
+//	    # Eth1
+//	    eth1_data=pre.eth1_data,
+//	    eth1_data_votes=pre.eth1_data_votes,
+//	    eth1_deposit_index=pre.eth1_deposit_index,
+//	    # Registry
+//	    validators=pre.validators,
+//	    balances=pre.balances,
+//	    # Randomness
+//	    randao_mixes=pre.randao_mixes,
+//	    # Slashings
+//	    slashings=pre.slashings,
+//	    # Participation
+//	    previous_epoch_participation=[ParticipationFlags(0b0000_0000) for _ in range(len(pre.validators))],
+//	    current_epoch_participation=[ParticipationFlags(0b0000_0000) for _ in range(len(pre.validators))],
+//	    # Finality
+//	    justification_bits=pre.justification_bits,
+//	    previous_justified_checkpoint=pre.previous_justified_checkpoint,
+//	    current_justified_checkpoint=pre.current_justified_checkpoint,
+//	    finalized_checkpoint=pre.finalized_checkpoint,
+//	    # Inactivity
+//	    inactivity_scores=[uint64(0) for _ in range(len(pre.validators))],
+//	)
+//	# Fill in previous epoch participation from the pre state's pending attestations
+//	translate_participation(post, pre.previous_epoch_attestations)
+//
+//	# Fill in sync committees
+//	# Note: A duplicate committee is assigned for the current and next committee at the fork boundary
+//	post.current_sync_committee = get_next_sync_committee(post)
+//	post.next_sync_committee = get_next_sync_committee(post)
+//	return post
 func UpgradeToAltair(ctx context.Context, state state.BeaconState) (state.BeaconState, error) {
 	epoch := time.CurrentEpoch(state)

 	numValidators := state.NumValidators()
+	hrs, err := state.HistoricalRoots()
+	if err != nil {
+		return nil, err
+	}
 	s := &ethpb.BeaconStateAltair{
 		GenesisTime:           state.GenesisTime(),
 		GenesisValidatorsRoot: state.GenesisValidatorsRoot(),
@@ -78,7 +83,7 @@ func UpgradeToAltair(ctx context.Context, state state.BeaconState) (state.Beacon
 		LatestBlockHeader:           state.LatestBlockHeader(),
 		BlockRoots:                  state.BlockRoots(),
 		StateRoots:                  state.StateRoots(),
-		HistoricalRoots:             state.HistoricalRoots(),
+		HistoricalRoots:             hrs,
 		Eth1Data:                    state.Eth1Data(),
 		Eth1DataVotes:               state.Eth1DataVotes(),
 		Eth1DepositIndex:            state.Eth1DepositIndex(),
@@ -126,17 +131,18 @@ func UpgradeToAltair(ctx context.Context, state state.BeaconState) (state.Beacon
 //
 // Spec code:
 // def translate_participation(state: BeaconState, pending_attestations: Sequence[phase0.PendingAttestation]) -> None:
-//    for attestation in pending_attestations:
-//        data = attestation.data
-//        inclusion_delay = attestation.inclusion_delay
-//        # Translate attestation inclusion info to flag indices
-//        participation_flag_indices = get_attestation_participation_flag_indices(state, data, inclusion_delay)
 //
-//        # Apply flags to all attesting validators
-//        epoch_participation = state.previous_epoch_participation
-//        for index in get_attesting_indices(state, data, attestation.aggregation_bits):
-//            for flag_index in participation_flag_indices:
-//                epoch_participation[index] = add_flag(epoch_participation[index], flag_index)
+//	for attestation in pending_attestations:
+//	    data = attestation.data
+//	    inclusion_delay = attestation.inclusion_delay
+//	    # Translate attestation inclusion info to flag indices
+//	    participation_flag_indices = get_attestation_participation_flag_indices(state, data, inclusion_delay)
+//
+//	    # Apply flags to all attesting validators
+//	    epoch_participation = state.previous_epoch_participation
+//	    for index in get_attesting_indices(state, data, attestation.aggregation_bits):
+//	        for flag_index in participation_flag_indices:
+//	            epoch_participation[index] = add_flag(epoch_participation[index], flag_index)
 func TranslateParticipation(ctx context.Context, state state.BeaconState, atts []*ethpb.PendingAttestation) (state.BeaconState, error) {
 	epochParticipation, err := state.PreviousEpochParticipation()
 	if err != nil {
--- a/beacon-chain/core/altair/upgrade_test.go
+++ b/beacon-chain/core/altair/upgrade_test.go
@@ -82,7 +82,11 @@ func TestUpgradeToAltair(t *testing.T) {
 	require.DeepSSZEqual(t, preForkState.LatestBlockHeader(), aState.LatestBlockHeader())
 	require.DeepSSZEqual(t, preForkState.BlockRoots(), aState.BlockRoots())
 	require.DeepSSZEqual(t, preForkState.StateRoots(), aState.StateRoots())
-	require.DeepSSZEqual(t, preForkState.HistoricalRoots(), aState.HistoricalRoots())
+	r1, err := preForkState.HistoricalRoots()
+	require.NoError(t, err)
+	r2, err := aState.HistoricalRoots()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, r1, r2)
 	require.DeepSSZEqual(t, preForkState.Eth1Data(), aState.Eth1Data())
 	require.DeepSSZEqual(t, preForkState.Eth1DataVotes(), aState.Eth1DataVotes())
 	require.DeepSSZEqual(t, preForkState.Eth1DepositIndex(), aState.Eth1DepositIndex())
--- a/beacon-chain/core/blocks/BUILD.bazel
+++ b/beacon-chain/core/blocks/BUILD.bazel
@@ -19,12 +19,7 @@ go_library(
        "withdrawals.go",
    ],
    importpath = "github.com/prysmaticlabs/prysm/v3/beacon-chain/core/blocks",
-    visibility = [
-        "//beacon-chain:__subpackages__",
-        "//testing/spectest:__subpackages__",
-        "//testing/util:__pkg__",
-        "//validator:__subpackages__",
-    ],
+    visibility = ["//visibility:public"],
    deps = [
        "//beacon-chain/core/helpers:go_default_library",
        "//beacon-chain/core/signing:go_default_library",
@@ -41,10 +36,12 @@ go_library(
        "//contracts/deposit:go_default_library",
        "//crypto/bls:go_default_library",
        "//crypto/hash:go_default_library",
-        "//crypto/hash/htr:go_default_library",
        "//encoding/bytesutil:go_default_library",
+        "//encoding/ssz:go_default_library",
        "//math:go_default_library",
        "//network/forks:go_default_library",
+        "//proto/engine/v1:go_default_library",
+        "//proto/eth/v2:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//proto/prysm/v1alpha1/attestation:go_default_library",
        "//proto/prysm/v1alpha1/slashings:go_default_library",
@@ -69,6 +66,7 @@ go_test(
        "deposit_test.go",
        "eth1_data_test.go",
        "exit_test.go",
+        "exports_test.go",
        "genesis_test.go",
        "header_test.go",
        "payload_test.go",
@@ -96,10 +94,12 @@ go_test(
        "//consensus-types/primitives:go_default_library",
        "//container/trie:go_default_library",
        "//crypto/bls:go_default_library",
-        "//crypto/hash/htr:go_default_library",
+        "//crypto/bls/common:go_default_library",
+        "//crypto/hash:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//encoding/ssz:go_default_library",
        "//proto/engine/v1:go_default_library",
+        "//proto/migration:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//proto/prysm/v1alpha1/attestation:go_default_library",
        "//proto/prysm/v1alpha1/attestation/aggregation:go_default_library",
--- a/beacon-chain/core/blocks/attestation.go
+++ b/beacon-chain/core/blocks/attestation.go
@@ -185,19 +185,20 @@ func VerifyAttestationSignature(ctx context.Context, beaconState state.ReadOnlyB
 // VerifyIndexedAttestation determines the validity of an indexed attestation.
 //
 // Spec pseudocode definition:
-//  def is_valid_indexed_attestation(state: BeaconState, indexed_attestation: IndexedAttestation) -> bool:
-//    """
-//    Check if ``indexed_attestation`` is not empty, has sorted and unique indices and has a valid aggregate signature.
-//    """
-//    # Verify indices are sorted and unique
-//    indices = indexed_attestation.attesting_indices
-//    if len(indices) == 0 or not indices == sorted(set(indices)):
-//        return False
-//    # Verify aggregate signature
-//    pubkeys = [state.validators[i].pubkey for i in indices]
-//    domain = get_domain(state, DOMAIN_BEACON_ATTESTER, indexed_attestation.data.target.epoch)
-//    signing_root = compute_signing_root(indexed_attestation.data, domain)
-//    return bls.FastAggregateVerify(pubkeys, signing_root, indexed_attestation.signature)
+//
+//	def is_valid_indexed_attestation(state: BeaconState, indexed_attestation: IndexedAttestation) -> bool:
+//	  """
+//	  Check if ``indexed_attestation`` is not empty, has sorted and unique indices and has a valid aggregate signature.
+//	  """
+//	  # Verify indices are sorted and unique
+//	  indices = indexed_attestation.attesting_indices
+//	  if len(indices) == 0 or not indices == sorted(set(indices)):
+//	      return False
+//	  # Verify aggregate signature
+//	  pubkeys = [state.validators[i].pubkey for i in indices]
+//	  domain = get_domain(state, DOMAIN_BEACON_ATTESTER, indexed_attestation.data.target.epoch)
+//	  signing_root = compute_signing_root(indexed_attestation.data, domain)
+//	  return bls.FastAggregateVerify(pubkeys, signing_root, indexed_attestation.signature)
 func VerifyIndexedAttestation(ctx context.Context, beaconState state.ReadOnlyBeaconState, indexedAtt *ethpb.IndexedAttestation) error {
 	ctx, span := trace.StartSpan(ctx, "core.VerifyIndexedAttestation")
 	defer span.End()
--- a/beacon-chain/core/blocks/attestation_regression_test.go
+++ b/beacon-chain/core/blocks/attestation_regression_test.go
@@ -64,7 +64,7 @@ func TestVerifyAttestationNoVerifySignature_IncorrectSourceEpoch(t *testing.T) {
 		AggregationBits: aggBits,
 	}

-	zeroSig := [96]byte{}
+	var zeroSig [96]byte
 	att.Signature = zeroSig[:]

 	err := beaconState.SetSlot(beaconState.Slot() + params.BeaconConfig().MinAttestationInclusionDelay)
--- a/beacon-chain/core/blocks/attestation_test.go
+++ b/beacon-chain/core/blocks/attestation_test.go
@@ -113,7 +113,7 @@ func TestProcessAttestationsNoVerify_OK(t *testing.T) {
 		AggregationBits: aggBits,
 	}

-	zeroSig := [fieldparams.BLSSignatureLength]byte{}
+	var zeroSig [fieldparams.BLSSignatureLength]byte
 	att.Signature = zeroSig[:]

 	err := beaconState.SetSlot(beaconState.Slot() + params.BeaconConfig().MinAttestationInclusionDelay)
@@ -144,7 +144,7 @@ func TestVerifyAttestationNoVerifySignature_OK(t *testing.T) {
 		AggregationBits: aggBits,
 	}

-	zeroSig := [fieldparams.BLSSignatureLength]byte{}
+	var zeroSig [fieldparams.BLSSignatureLength]byte
 	att.Signature = zeroSig[:]

 	err := beaconState.SetSlot(beaconState.Slot() + params.BeaconConfig().MinAttestationInclusionDelay)
@@ -172,7 +172,7 @@ func TestVerifyAttestationNoVerifySignature_BadAttIdx(t *testing.T) {
 		},
 		AggregationBits: aggBits,
 	}
-	zeroSig := [fieldparams.BLSSignatureLength]byte{}
+	var zeroSig [fieldparams.BLSSignatureLength]byte
 	att.Signature = zeroSig[:]
 	require.NoError(t, beaconState.SetSlot(beaconState.Slot()+params.BeaconConfig().MinAttestationInclusionDelay))
 	ckp := beaconState.CurrentJustifiedCheckpoint()
--- a/beacon-chain/core/blocks/attester_slashing.go
+++ b/beacon-chain/core/blocks/attester_slashing.go
@@ -22,20 +22,21 @@ import (
 // Casper FFG slashing conditions if any slashable events occurred.
 //
 // Spec pseudocode definition:
-//   def process_attester_slashing(state: BeaconState, attester_slashing: AttesterSlashing) -> None:
-//    attestation_1 = attester_slashing.attestation_1
-//    attestation_2 = attester_slashing.attestation_2
-//    assert is_slashable_attestation_data(attestation_1.data, attestation_2.data)
-//    assert is_valid_indexed_attestation(state, attestation_1)
-//    assert is_valid_indexed_attestation(state, attestation_2)
 //
-//    slashed_any = False
-//    indices = set(attestation_1.attesting_indices).intersection(attestation_2.attesting_indices)
-//    for index in sorted(indices):
-//        if is_slashable_validator(state.validators[index], get_current_epoch(state)):
-//            slash_validator(state, index)
-//            slashed_any = True
-//    assert slashed_any
+//	def process_attester_slashing(state: BeaconState, attester_slashing: AttesterSlashing) -> None:
+//	 attestation_1 = attester_slashing.attestation_1
+//	 attestation_2 = attester_slashing.attestation_2
+//	 assert is_slashable_attestation_data(attestation_1.data, attestation_2.data)
+//	 assert is_valid_indexed_attestation(state, attestation_1)
+//	 assert is_valid_indexed_attestation(state, attestation_2)
+//
+//	 slashed_any = False
+//	 indices = set(attestation_1.attesting_indices).intersection(attestation_2.attesting_indices)
+//	 for index in sorted(indices):
+//	     if is_slashable_validator(state.validators[index], get_current_epoch(state)):
+//	         slash_validator(state, index)
+//	         slashed_any = True
+//	 assert slashed_any
 func ProcessAttesterSlashings(
 	ctx context.Context,
 	beaconState state.BeaconState,
@@ -83,7 +84,7 @@ func ProcessAttesterSlashing(
 				slashingQuotient = cfg.MinSlashingPenaltyQuotient
 			case beaconState.Version() == version.Altair:
 				slashingQuotient = cfg.MinSlashingPenaltyQuotientAltair
-			case beaconState.Version() == version.Bellatrix:
+			case beaconState.Version() >= version.Bellatrix:
 				slashingQuotient = cfg.MinSlashingPenaltyQuotientBellatrix
 			default:
 				return nil, errors.New("unknown state version")
@@ -132,16 +133,17 @@ func VerifyAttesterSlashing(ctx context.Context, beaconState state.ReadOnlyBeaco
 // IsSlashableAttestationData verifies a slashing against the Casper Proof of Stake FFG rules.
 //
 // Spec pseudocode definition:
-//   def is_slashable_attestation_data(data_1: AttestationData, data_2: AttestationData) -> bool:
-//    """
-//    Check if ``data_1`` and ``data_2`` are slashable according to Casper FFG rules.
-//    """
-//    return (
-//        # Double vote
-//        (data_1 != data_2 and data_1.target.epoch == data_2.target.epoch) or
-//        # Surround vote
-//        (data_1.source.epoch < data_2.source.epoch and data_2.target.epoch < data_1.target.epoch)
-//    )
+//
+//	def is_slashable_attestation_data(data_1: AttestationData, data_2: AttestationData) -> bool:
+//	 """
+//	 Check if ``data_1`` and ``data_2`` are slashable according to Casper FFG rules.
+//	 """
+//	 return (
+//	     # Double vote
+//	     (data_1 != data_2 and data_1.target.epoch == data_2.target.epoch) or
+//	     # Surround vote
+//	     (data_1.source.epoch < data_2.source.epoch and data_2.target.epoch < data_1.target.epoch)
+//	 )
 func IsSlashableAttestationData(data1, data2 *ethpb.AttestationData) bool {
 	if data1 == nil || data2 == nil || data1.Target == nil || data2.Target == nil || data1.Source == nil || data2.Source == nil {
 		return false
--- a/beacon-chain/core/blocks/attester_slashing_test.go
+++ b/beacon-chain/core/blocks/attester_slashing_test.go
@@ -302,3 +302,72 @@ func TestProcessAttesterSlashings_AppliesCorrectStatusBellatrix(t *testing.T) {
 	require.Equal(t, uint64(31000000000), newState.Balances()[1])
 	require.Equal(t, uint64(32000000000), newState.Balances()[2])
 }
+
+func TestProcessAttesterSlashings_AppliesCorrectStatusCapella(t *testing.T) {
+	beaconState, privKeys := util.DeterministicGenesisStateCapella(t, 100)
+	for _, vv := range beaconState.Validators() {
+		vv.WithdrawableEpoch = types.Epoch(params.BeaconConfig().SlotsPerEpoch)
+	}
+
+	att1 := util.HydrateIndexedAttestation(&ethpb.IndexedAttestation{
+		Data: &ethpb.AttestationData{
+			Source: &ethpb.Checkpoint{Epoch: 1},
+		},
+		AttestingIndices: []uint64{0, 1},
+	})
+	domain, err := signing.Domain(beaconState.Fork(), 0, params.BeaconConfig().DomainBeaconAttester, beaconState.GenesisValidatorsRoot())
+	require.NoError(t, err)
+	signingRoot, err := signing.ComputeSigningRoot(att1.Data, domain)
+	assert.NoError(t, err, "Could not get signing root of beacon block header")
+	sig0 := privKeys[0].Sign(signingRoot[:])
+	sig1 := privKeys[1].Sign(signingRoot[:])
+	aggregateSig := bls.AggregateSignatures([]bls.Signature{sig0, sig1})
+	att1.Signature = aggregateSig.Marshal()
+
+	att2 := util.HydrateIndexedAttestation(&ethpb.IndexedAttestation{
+		AttestingIndices: []uint64{0, 1},
+	})
+	signingRoot, err = signing.ComputeSigningRoot(att2.Data, domain)
+	assert.NoError(t, err, "Could not get signing root of beacon block header")
+	sig0 = privKeys[0].Sign(signingRoot[:])
+	sig1 = privKeys[1].Sign(signingRoot[:])
+	aggregateSig = bls.AggregateSignatures([]bls.Signature{sig0, sig1})
+	att2.Signature = aggregateSig.Marshal()
+
+	slashings := []*ethpb.AttesterSlashing{
+		{
+			Attestation_1: att1,
+			Attestation_2: att2,
+		},
+	}
+
+	currentSlot := 2 * params.BeaconConfig().SlotsPerEpoch
+	require.NoError(t, beaconState.SetSlot(currentSlot))
+
+	b := util.NewBeaconBlock()
+	b.Block = &ethpb.BeaconBlock{
+		Body: &ethpb.BeaconBlockBody{
+			AttesterSlashings: slashings,
+		},
+	}
+
+	newState, err := blocks.ProcessAttesterSlashings(context.Background(), beaconState, b.Block.Body.AttesterSlashings, v.SlashValidator)
+	require.NoError(t, err)
+	newRegistry := newState.Validators()
+
+	// Given the intersection of slashable indices is [1], only validator
+	// at index 1 should be slashed and exited. We confirm this below.
+	if newRegistry[1].ExitEpoch != beaconState.Validators()[1].ExitEpoch {
+		t.Errorf(
+			`
+			Expected validator at index 1's exit epoch to match
+			%d, received %d instead
+			`,
+			beaconState.Validators()[1].ExitEpoch,
+			newRegistry[1].ExitEpoch,
+		)
+	}
+
+	require.Equal(t, uint64(31000000000), newState.Balances()[1])
+	require.Equal(t, uint64(32000000000), newState.Balances()[2])
+}
--- a/beacon-chain/core/blocks/block_operations_fuzz_test.go
+++ b/beacon-chain/core/blocks/block_operations_fuzz_test.go
@@ -55,9 +55,9 @@ func TestFuzzProcessBlockHeader_10000(t *testing.T) {
 func TestFuzzverifyDepositDataSigningRoot_10000(_ *testing.T) {
 	fuzzer := fuzz.NewWithSeed(0)
 	var ba []byte
-	pubkey := [fieldparams.BLSPubkeyLength]byte{}
-	sig := [96]byte{}
-	domain := [4]byte{}
+	var pubkey [fieldparams.BLSPubkeyLength]byte
+	var sig [96]byte
+	var domain [4]byte
 	var p []byte
 	var s []byte
 	var d []byte
--- a/beacon-chain/core/blocks/deposit.go
+++ b/beacon-chain/core/blocks/deposit.go
@@ -71,8 +71,9 @@ func ActivateValidatorWithEffectiveBalance(beaconState state.BeaconState, deposi
 // into the beacon chain.
 //
 // Spec pseudocode definition:
-//   For each deposit in block.body.deposits:
-//     process_deposit(state, deposit)
+//
+//	For each deposit in block.body.deposits:
+//	  process_deposit(state, deposit)
 func ProcessDeposits(
 	ctx context.Context,
 	beaconState state.BeaconState,
@@ -120,40 +121,41 @@ func BatchVerifyDepositsSignatures(ctx context.Context, deposits []*ethpb.Deposi
 //
 // Spec pseudocode definition:
 // def process_deposit(state: BeaconState, deposit: Deposit) -> None:
-//    # Verify the Merkle branch
-//    assert is_valid_merkle_branch(
-//        leaf=hash_tree_root(deposit.data),
-//        branch=deposit.proof,
-//        depth=DEPOSIT_CONTRACT_TREE_DEPTH + 1,  # Add 1 for the List length mix-in
-//        index=state.eth1_deposit_index,
-//        root=state.eth1_data.deposit_root,
-//    )
 //
-//    # Deposits must be processed in order
-//    state.eth1_deposit_index += 1
+//	# Verify the Merkle branch
+//	assert is_valid_merkle_branch(
+//	    leaf=hash_tree_root(deposit.data),
+//	    branch=deposit.proof,
+//	    depth=DEPOSIT_CONTRACT_TREE_DEPTH + 1,  # Add 1 for the List length mix-in
+//	    index=state.eth1_deposit_index,
+//	    root=state.eth1_data.deposit_root,
+//	)
 //
-//    pubkey = deposit.data.pubkey
-//    amount = deposit.data.amount
-//    validator_pubkeys = [v.pubkey for v in state.validators]
-//    if pubkey not in validator_pubkeys:
-//        # Verify the deposit signature (proof of possession) which is not checked by the deposit contract
-//        deposit_message = DepositMessage(
-//            pubkey=deposit.data.pubkey,
-//            withdrawal_credentials=deposit.data.withdrawal_credentials,
-//            amount=deposit.data.amount,
-//        )
-//        domain = compute_domain(DOMAIN_DEPOSIT)  # Fork-agnostic domain since deposits are valid across forks
-//        signing_root = compute_signing_root(deposit_message, domain)
-//        if not bls.Verify(pubkey, signing_root, deposit.data.signature):
-//            return
+//	# Deposits must be processed in order
+//	state.eth1_deposit_index += 1
 //
-//        # Add validator and balance entries
-//        state.validators.append(get_validator_from_deposit(state, deposit))
-//        state.balances.append(amount)
-//    else:
-//        # Increase balance by deposit amount
-//        index = ValidatorIndex(validator_pubkeys.index(pubkey))
-//        increase_balance(state, index, amount)
+//	pubkey = deposit.data.pubkey
+//	amount = deposit.data.amount
+//	validator_pubkeys = [v.pubkey for v in state.validators]
+//	if pubkey not in validator_pubkeys:
+//	    # Verify the deposit signature (proof of possession) which is not checked by the deposit contract
+//	    deposit_message = DepositMessage(
+//	        pubkey=deposit.data.pubkey,
+//	        withdrawal_credentials=deposit.data.withdrawal_credentials,
+//	        amount=deposit.data.amount,
+//	    )
+//	    domain = compute_domain(DOMAIN_DEPOSIT)  # Fork-agnostic domain since deposits are valid across forks
+//	    signing_root = compute_signing_root(deposit_message, domain)
+//	    if not bls.Verify(pubkey, signing_root, deposit.data.signature):
+//	        return
+//
+//	    # Add validator and balance entries
+//	    state.validators.append(get_validator_from_deposit(state, deposit))
+//	    state.balances.append(amount)
+//	else:
+//	    # Increase balance by deposit amount
+//	    index = ValidatorIndex(validator_pubkeys.index(pubkey))
+//	    increase_balance(state, index, amount)
 func ProcessDeposit(beaconState state.BeaconState, deposit *ethpb.Deposit, verifySignature bool) (state.BeaconState, bool, error) {
 	var newValidator bool
 	if err := verifyDeposit(beaconState, deposit); err != nil {
--- a/beacon-chain/core/blocks/error.go
+++ b/beacon-chain/core/blocks/error.go
@@ -6,3 +6,8 @@ var errNilSignedWithdrawalMessage = errors.New("nil SignedBLSToExecutionChange m
 var errNilWithdrawalMessage = errors.New("nil BLSToExecutionChange message")
 var errInvalidBLSPrefix = errors.New("withdrawal credential prefix is not a BLS prefix")
 var errInvalidWithdrawalCredentials = errors.New("withdrawal credentials do not match")
+var errInvalidWithdrawalIndex = errors.New("invalid withdrawal index")
+var errInvalidValidatorIndex = errors.New("invalid validator index")
+var errInvalidWithdrawalAmount = errors.New("invalid withdrawal amount")
+var errInvalidExecutionAddress = errors.New("invalid execution address")
+var errInvalidWithdrawalNumber = errors.New("invalid number of withdrawals")
--- a/beacon-chain/core/blocks/eth1_data.go
+++ b/beacon-chain/core/blocks/eth1_data.go
@@ -15,10 +15,11 @@ import (
 // into the beacon state.
 //
 // Official spec definition:
-//   def process_eth1_data(state: BeaconState, body: BeaconBlockBody) -> None:
-//    state.eth1_data_votes.append(body.eth1_data)
-//    if state.eth1_data_votes.count(body.eth1_data) * 2 > EPOCHS_PER_ETH1_VOTING_PERIOD * SLOTS_PER_EPOCH:
-//        state.eth1_data = body.eth1_data
+//
+//	def process_eth1_data(state: BeaconState, body: BeaconBlockBody) -> None:
+//	 state.eth1_data_votes.append(body.eth1_data)
+//	 if state.eth1_data_votes.count(body.eth1_data) * 2 > EPOCHS_PER_ETH1_VOTING_PERIOD * SLOTS_PER_EPOCH:
+//	     state.eth1_data = body.eth1_data
 func ProcessEth1DataInBlock(_ context.Context, beaconState state.BeaconState, eth1Data *ethpb.Eth1Data) (state.BeaconState, error) {
 	if beaconState == nil || beaconState.IsNil() {
 		return nil, errors.New("nil state")
--- a/beacon-chain/core/blocks/exit.go
+++ b/beacon-chain/core/blocks/exit.go
@@ -27,23 +27,24 @@ var ValidatorCannotExitYetMsg = "validator has not been active long enough to ex
 // should exit the state's validator registry.
 //
 // Spec pseudocode definition:
-//   def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
-//    voluntary_exit = signed_voluntary_exit.message
-//    validator = state.validators[voluntary_exit.validator_index]
-//    # Verify the validator is active
-//    assert is_active_validator(validator, get_current_epoch(state))
-//    # Verify exit has not been initiated
-//    assert validator.exit_epoch == FAR_FUTURE_EPOCH
-//    # Exits must specify an epoch when they become valid; they are not valid before then
-//    assert get_current_epoch(state) >= voluntary_exit.epoch
-//    # Verify the validator has been active long enough
-//    assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
-//    # Verify signature
-//    domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
-//    signing_root = compute_signing_root(voluntary_exit, domain)
-//    assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
-//    # Initiate exit
-//    initiate_validator_exit(state, voluntary_exit.validator_index)
+//
+//	def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
+//	 voluntary_exit = signed_voluntary_exit.message
+//	 validator = state.validators[voluntary_exit.validator_index]
+//	 # Verify the validator is active
+//	 assert is_active_validator(validator, get_current_epoch(state))
+//	 # Verify exit has not been initiated
+//	 assert validator.exit_epoch == FAR_FUTURE_EPOCH
+//	 # Exits must specify an epoch when they become valid; they are not valid before then
+//	 assert get_current_epoch(state) >= voluntary_exit.epoch
+//	 # Verify the validator has been active long enough
+//	 assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
+//	 # Verify signature
+//	 domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
+//	 signing_root = compute_signing_root(voluntary_exit, domain)
+//	 assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
+//	 # Initiate exit
+//	 initiate_validator_exit(state, voluntary_exit.validator_index)
 func ProcessVoluntaryExits(
 	ctx context.Context,
 	beaconState state.BeaconState,
@@ -71,23 +72,24 @@ func ProcessVoluntaryExits(
 // VerifyExitAndSignature implements the spec defined validation for voluntary exits.
 //
 // Spec pseudocode definition:
-//   def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
-//    voluntary_exit = signed_voluntary_exit.message
-//    validator = state.validators[voluntary_exit.validator_index]
-//    # Verify the validator is active
-//    assert is_active_validator(validator, get_current_epoch(state))
-//    # Verify exit has not been initiated
-//    assert validator.exit_epoch == FAR_FUTURE_EPOCH
-//    # Exits must specify an epoch when they become valid; they are not valid before then
-//    assert get_current_epoch(state) >= voluntary_exit.epoch
-//    # Verify the validator has been active long enough
-//    assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
-//    # Verify signature
-//    domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
-//    signing_root = compute_signing_root(voluntary_exit, domain)
-//    assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
-//    # Initiate exit
-//    initiate_validator_exit(state, voluntary_exit.validator_index)
+//
+//	def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
+//	 voluntary_exit = signed_voluntary_exit.message
+//	 validator = state.validators[voluntary_exit.validator_index]
+//	 # Verify the validator is active
+//	 assert is_active_validator(validator, get_current_epoch(state))
+//	 # Verify exit has not been initiated
+//	 assert validator.exit_epoch == FAR_FUTURE_EPOCH
+//	 # Exits must specify an epoch when they become valid; they are not valid before then
+//	 assert get_current_epoch(state) >= voluntary_exit.epoch
+//	 # Verify the validator has been active long enough
+//	 assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
+//	 # Verify signature
+//	 domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
+//	 signing_root = compute_signing_root(voluntary_exit, domain)
+//	 assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
+//	 # Initiate exit
+//	 initiate_validator_exit(state, voluntary_exit.validator_index)
 func VerifyExitAndSignature(
 	validator state.ReadOnlyValidator,
 	currentSlot types.Slot,
@@ -117,23 +119,24 @@ func VerifyExitAndSignature(
 // verifyExitConditions implements the spec defined validation for voluntary exits(excluding signatures).
 //
 // Spec pseudocode definition:
-//   def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
-//    voluntary_exit = signed_voluntary_exit.message
-//    validator = state.validators[voluntary_exit.validator_index]
-//    # Verify the validator is active
-//    assert is_active_validator(validator, get_current_epoch(state))
-//    # Verify exit has not been initiated
-//    assert validator.exit_epoch == FAR_FUTURE_EPOCH
-//    # Exits must specify an epoch when they become valid; they are not valid before then
-//    assert get_current_epoch(state) >= voluntary_exit.epoch
-//    # Verify the validator has been active long enough
-//    assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
-//    # Verify signature
-//    domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
-//    signing_root = compute_signing_root(voluntary_exit, domain)
-//    assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
-//    # Initiate exit
-//    initiate_validator_exit(state, voluntary_exit.validator_index)
+//
+//	def process_voluntary_exit(state: BeaconState, signed_voluntary_exit: SignedVoluntaryExit) -> None:
+//	 voluntary_exit = signed_voluntary_exit.message
+//	 validator = state.validators[voluntary_exit.validator_index]
+//	 # Verify the validator is active
+//	 assert is_active_validator(validator, get_current_epoch(state))
+//	 # Verify exit has not been initiated
+//	 assert validator.exit_epoch == FAR_FUTURE_EPOCH
+//	 # Exits must specify an epoch when they become valid; they are not valid before then
+//	 assert get_current_epoch(state) >= voluntary_exit.epoch
+//	 # Verify the validator has been active long enough
+//	 assert get_current_epoch(state) >= validator.activation_epoch + SHARD_COMMITTEE_PERIOD
+//	 # Verify signature
+//	 domain = get_domain(state, DOMAIN_VOLUNTARY_EXIT, voluntary_exit.epoch)
+//	 signing_root = compute_signing_root(voluntary_exit, domain)
+//	 assert bls.Verify(validator.pubkey, signing_root, signed_voluntary_exit.signature)
+//	 # Initiate exit
+//	 initiate_validator_exit(state, voluntary_exit.validator_index)
 func verifyExitConditions(validator state.ReadOnlyValidator, currentSlot types.Slot, exit *ethpb.VoluntaryExit) error {
 	currentEpoch := slots.ToEpoch(currentSlot)
 	// Verify the validator is active.
--- a/beacon-chain/core/blocks/exports_test.go
+++ b/beacon-chain/core/blocks/exports_test.go
@@ -0,0 +1,3 @@
+package blocks
+
+var ProcessBLSToExecutionChange = processBLSToExecutionChange
--- a/beacon-chain/core/blocks/genesis.go
+++ b/beacon-chain/core/blocks/genesis.go
@@ -3,9 +3,16 @@
 package blocks

 import (
+	"context"
+
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
+	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
+	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
+	enginev1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 )

@@ -29,3 +36,116 @@ func NewGenesisBlock(stateRoot []byte) *ethpb.SignedBeaconBlock {
 	}
 	return block
 }
+
+var ErrUnrecognizedState = errors.New("unknown underlying type for state.BeaconState value")
+
+func NewGenesisBlockForState(ctx context.Context, st state.BeaconState) (interfaces.SignedBeaconBlock, error) {
+	root, err := st.HashTreeRoot(ctx)
+	if err != nil {
+		return nil, err
+	}
+	ps := st.ToProto()
+	switch ps.(type) {
+	case *ethpb.BeaconState:
+		return blocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlock{
+			Block: &ethpb.BeaconBlock{
+				ParentRoot: params.BeaconConfig().ZeroHash[:],
+				StateRoot:  root[:],
+				Body: &ethpb.BeaconBlockBody{
+					RandaoReveal: make([]byte, fieldparams.BLSSignatureLength),
+					Eth1Data: &ethpb.Eth1Data{
+						DepositRoot: make([]byte, 32),
+						BlockHash:   make([]byte, 32),
+					},
+					Graffiti: make([]byte, 32),
+				},
+			},
+			Signature: params.BeaconConfig().EmptySignature[:],
+		})
+	case *ethpb.BeaconStateAltair:
+		return blocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockAltair{
+			Block: &ethpb.BeaconBlockAltair{
+				ParentRoot: params.BeaconConfig().ZeroHash[:],
+				StateRoot:  root[:],
+				Body: &ethpb.BeaconBlockBodyAltair{
+					RandaoReveal: make([]byte, fieldparams.BLSSignatureLength),
+					Eth1Data: &ethpb.Eth1Data{
+						DepositRoot: make([]byte, 32),
+						BlockHash:   make([]byte, 32),
+					},
+					Graffiti: make([]byte, 32),
+					SyncAggregate: &ethpb.SyncAggregate{
+						SyncCommitteeBits:      make([]byte, fieldparams.SyncCommitteeLength/8),
+						SyncCommitteeSignature: make([]byte, fieldparams.BLSSignatureLength),
+					},
+				},
+			},
+			Signature: params.BeaconConfig().EmptySignature[:],
+		})
+	case *ethpb.BeaconStateBellatrix:
+		return blocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockBellatrix{
+			Block: &ethpb.BeaconBlockBellatrix{
+				ParentRoot: params.BeaconConfig().ZeroHash[:],
+				StateRoot:  root[:],
+				Body: &ethpb.BeaconBlockBodyBellatrix{
+					RandaoReveal: make([]byte, 96),
+					Eth1Data: &ethpb.Eth1Data{
+						DepositRoot: make([]byte, 32),
+						BlockHash:   make([]byte, 32),
+					},
+					Graffiti: make([]byte, 32),
+					SyncAggregate: &ethpb.SyncAggregate{
+						SyncCommitteeBits:      make([]byte, fieldparams.SyncCommitteeLength/8),
+						SyncCommitteeSignature: make([]byte, fieldparams.BLSSignatureLength),
+					},
+					ExecutionPayload: &enginev1.ExecutionPayload{
+						ParentHash:    make([]byte, 32),
+						FeeRecipient:  make([]byte, 20),
+						StateRoot:     make([]byte, 32),
+						ReceiptsRoot:  make([]byte, 32),
+						LogsBloom:     make([]byte, 256),
+						PrevRandao:    make([]byte, 32),
+						BaseFeePerGas: make([]byte, 32),
+						BlockHash:     make([]byte, 32),
+						Transactions:  make([][]byte, 0),
+					},
+				},
+			},
+			Signature: params.BeaconConfig().EmptySignature[:],
+		})
+	case *ethpb.BeaconStateCapella:
+		return blocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockCapella{
+			Block: &ethpb.BeaconBlockCapella{
+				ParentRoot: params.BeaconConfig().ZeroHash[:],
+				StateRoot:  root[:],
+				Body: &ethpb.BeaconBlockBodyCapella{
+					RandaoReveal: make([]byte, 96),
+					Eth1Data: &ethpb.Eth1Data{
+						DepositRoot: make([]byte, 32),
+						BlockHash:   make([]byte, 32),
+					},
+					Graffiti: make([]byte, 32),
+					SyncAggregate: &ethpb.SyncAggregate{
+						SyncCommitteeBits:      make([]byte, fieldparams.SyncCommitteeLength/8),
+						SyncCommitteeSignature: make([]byte, fieldparams.BLSSignatureLength),
+					},
+					ExecutionPayload: &enginev1.ExecutionPayloadCapella{
+						ParentHash:    make([]byte, 32),
+						FeeRecipient:  make([]byte, 20),
+						StateRoot:     make([]byte, 32),
+						ReceiptsRoot:  make([]byte, 32),
+						LogsBloom:     make([]byte, 256),
+						PrevRandao:    make([]byte, 32),
+						BaseFeePerGas: make([]byte, 32),
+						BlockHash:     make([]byte, 32),
+						Transactions:  make([][]byte, 0),
+						Withdrawals:   make([]*enginev1.Withdrawal, 0),
+					},
+				},
+			},
+			Signature: params.BeaconConfig().EmptySignature[:],
+		})
+	default:
+		return nil, ErrUnrecognizedState
+	}
+}
--- a/beacon-chain/core/blocks/header.go
+++ b/beacon-chain/core/blocks/header.go
@@ -18,27 +18,27 @@ import (
 //
 // Spec pseudocode definition:
 //
-//  def process_block_header(state: BeaconState, block: BeaconBlock) -> None:
-//    # Verify that the slots match
-//    assert block.slot == state.slot
-//    # Verify that the block is newer than latest block header
-//    assert block.slot > state.latest_block_header.slot
-//    # Verify that proposer index is the correct index
-//    assert block.proposer_index == get_beacon_proposer_index(state)
-//    # Verify that the parent matches
-//    assert block.parent_root == hash_tree_root(state.latest_block_header)
-//    # Cache current block as the new latest block
-//    state.latest_block_header = BeaconBlockHeader(
-//        slot=block.slot,
-//        proposer_index=block.proposer_index,
-//        parent_root=block.parent_root,
-//        state_root=Bytes32(),  # Overwritten in the next process_slot call
-//        body_root=hash_tree_root(block.body),
-//    )
+//	def process_block_header(state: BeaconState, block: BeaconBlock) -> None:
+//	  # Verify that the slots match
+//	  assert block.slot == state.slot
+//	  # Verify that the block is newer than latest block header
+//	  assert block.slot > state.latest_block_header.slot
+//	  # Verify that proposer index is the correct index
+//	  assert block.proposer_index == get_beacon_proposer_index(state)
+//	  # Verify that the parent matches
+//	  assert block.parent_root == hash_tree_root(state.latest_block_header)
+//	  # Cache current block as the new latest block
+//	  state.latest_block_header = BeaconBlockHeader(
+//	      slot=block.slot,
+//	      proposer_index=block.proposer_index,
+//	      parent_root=block.parent_root,
+//	      state_root=Bytes32(),  # Overwritten in the next process_slot call
+//	      body_root=hash_tree_root(block.body),
+//	  )
 //
-//    # Verify proposer is not slashed
-//    proposer = state.validators[block.proposer_index]
-//    assert not proposer.slashed
+//	  # Verify proposer is not slashed
+//	  proposer = state.validators[block.proposer_index]
+//	  assert not proposer.slashed
 func ProcessBlockHeader(
 	ctx context.Context,
 	beaconState state.BeaconState,
@@ -73,27 +73,28 @@ func ProcessBlockHeader(
 // using a unsigned block.
 //
 // Spec pseudocode definition:
-//  def process_block_header(state: BeaconState, block: BeaconBlock) -> None:
-//    # Verify that the slots match
-//    assert block.slot == state.slot
-//    # Verify that the block is newer than latest block header
-//    assert block.slot > state.latest_block_header.slot
-//    # Verify that proposer index is the correct index
-//    assert block.proposer_index == get_beacon_proposer_index(state)
-//    # Verify that the parent matches
-//    assert block.parent_root == hash_tree_root(state.latest_block_header)
-//    # Cache current block as the new latest block
-//    state.latest_block_header = BeaconBlockHeader(
-//        slot=block.slot,
-//        proposer_index=block.proposer_index,
-//        parent_root=block.parent_root,
-//        state_root=Bytes32(),  # Overwritten in the next process_slot call
-//        body_root=hash_tree_root(block.body),
-//    )
 //
-//    # Verify proposer is not slashed
-//    proposer = state.validators[block.proposer_index]
-//    assert not proposer.slashed
+//	def process_block_header(state: BeaconState, block: BeaconBlock) -> None:
+//	  # Verify that the slots match
+//	  assert block.slot == state.slot
+//	  # Verify that the block is newer than latest block header
+//	  assert block.slot > state.latest_block_header.slot
+//	  # Verify that proposer index is the correct index
+//	  assert block.proposer_index == get_beacon_proposer_index(state)
+//	  # Verify that the parent matches
+//	  assert block.parent_root == hash_tree_root(state.latest_block_header)
+//	  # Cache current block as the new latest block
+//	  state.latest_block_header = BeaconBlockHeader(
+//	      slot=block.slot,
+//	      proposer_index=block.proposer_index,
+//	      parent_root=block.parent_root,
+//	      state_root=Bytes32(),  # Overwritten in the next process_slot call
+//	      body_root=hash_tree_root(block.body),
+//	  )
+//
+//	  # Verify proposer is not slashed
+//	  proposer = state.validators[block.proposer_index]
+//	  assert not proposer.slashed
 func ProcessBlockHeaderNoVerify(
 	ctx context.Context,
 	beaconState state.BeaconState,
--- a/beacon-chain/core/blocks/payload.go
+++ b/beacon-chain/core/blocks/payload.go
@@ -25,7 +25,8 @@ var (
 //
 // Spec code:
 // def is_merge_transition_complete(state: BeaconState) -> bool:
-//    return state.latest_execution_payload_header != ExecutionPayloadHeader()
+//
+//	return state.latest_execution_payload_header != ExecutionPayloadHeader()
 func IsMergeTransitionComplete(st state.BeaconState) (bool, error) {
 	if st == nil {
 		return false, errors.New("nil state")
@@ -33,6 +34,9 @@ func IsMergeTransitionComplete(st state.BeaconState) (bool, error) {
 	if IsPreBellatrixVersion(st.Version()) {
 		return false, nil
 	}
+	if st.Version() > version.Bellatrix {
+		return true, nil
+	}
 	h, err := st.LatestExecutionPayloadHeader()
 	if err != nil {
 		return false, err
@@ -48,7 +52,8 @@ func IsMergeTransitionComplete(st state.BeaconState) (bool, error) {
 //
 // Spec code:
 // def is_execution_block(block: BeaconBlock) -> bool:
-//     return block.body.execution_payload != ExecutionPayload()
+//
+//	return block.body.execution_payload != ExecutionPayload()
 func IsExecutionBlock(body interfaces.BeaconBlockBody) (bool, error) {
 	if body == nil {
 		return false, errors.New("nil block body")
@@ -73,7 +78,8 @@ func IsExecutionBlock(body interfaces.BeaconBlockBody) (bool, error) {
 //
 // Spec code:
 // def is_execution_enabled(state: BeaconState, body: BeaconBlockBody) -> bool:
-//    return is_merge_block(state, body) or is_merge_complete(state)
+//
+//	return is_merge_block(state, body) or is_merge_complete(state)
 func IsExecutionEnabled(st state.BeaconState, body interfaces.BeaconBlockBody) (bool, error) {
 	if st == nil || body == nil {
 		return false, errors.New("nil state or block body")
@@ -110,9 +116,10 @@ func IsPreBellatrixVersion(v int) bool {
 // These validation steps ONLY apply to post merge.
 //
 // Spec code:
-//    # Verify consistency of the parent hash with respect to the previous execution payload header
-//    if is_merge_complete(state):
-//        assert payload.parent_hash == state.latest_execution_payload_header.block_hash
+//
+//	# Verify consistency of the parent hash with respect to the previous execution payload header
+//	if is_merge_complete(state):
+//	    assert payload.parent_hash == state.latest_execution_payload_header.block_hash
 func ValidatePayloadWhenMergeCompletes(st state.BeaconState, payload interfaces.ExecutionData) error {
 	complete, err := IsMergeTransitionComplete(st)
 	if err != nil {
@@ -121,12 +128,12 @@ func ValidatePayloadWhenMergeCompletes(st state.BeaconState, payload interfaces.
 	if !complete {
 		return nil
 	}
-
 	header, err := st.LatestExecutionPayloadHeader()
 	if err != nil {
 		return err
 	}
 	if !bytes.Equal(payload.ParentHash(), header.BlockHash()) {
+		log.Errorf("parent Hash %#x,  header Hash: %#x", bytesutil.Trunc(payload.ParentHash()), bytesutil.Trunc(header.BlockHash()))
 		return ErrInvalidPayloadBlockHash
 	}
 	return nil
@@ -136,10 +143,11 @@ func ValidatePayloadWhenMergeCompletes(st state.BeaconState, payload interfaces.
 // These validation steps apply to both pre merge and post merge.
 //
 // Spec code:
-//    # Verify random
-//    assert payload.random == get_randao_mix(state, get_current_epoch(state))
-//    # Verify timestamp
-//    assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
+//
+//	# Verify random
+//	assert payload.random == get_randao_mix(state, get_current_epoch(state))
+//	# Verify timestamp
+//	assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
 func ValidatePayload(st state.BeaconState, payload interfaces.ExecutionData) error {
 	random, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
 	if err != nil {
@@ -165,48 +173,51 @@ func ValidatePayload(st state.BeaconState, payload interfaces.ExecutionData) err
 //
 // Spec code:
 // def process_execution_payload(state: BeaconState, payload: ExecutionPayload, execution_engine: ExecutionEngine) -> None:
-//    # Verify consistency of the parent hash with respect to the previous execution payload header
-//    if is_merge_complete(state):
-//        assert payload.parent_hash == state.latest_execution_payload_header.block_hash
-//    # Verify random
-//    assert payload.random == get_randao_mix(state, get_current_epoch(state))
-//    # Verify timestamp
-//    assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
-//    # Verify the execution payload is valid
-//    assert execution_engine.execute_payload(payload)
-//    # Cache execution payload header
-//    state.latest_execution_payload_header = ExecutionPayloadHeader(
-//        parent_hash=payload.parent_hash,
-//        FeeRecipient=payload.FeeRecipient,
-//        state_root=payload.state_root,
-//        receipt_root=payload.receipt_root,
-//        logs_bloom=payload.logs_bloom,
-//        random=payload.random,
-//        block_number=payload.block_number,
-//        gas_limit=payload.gas_limit,
-//        gas_used=payload.gas_used,
-//        timestamp=payload.timestamp,
-//        extra_data=payload.extra_data,
-//        base_fee_per_gas=payload.base_fee_per_gas,
-//        block_hash=payload.block_hash,
-//        transactions_root=hash_tree_root(payload.transactions),
-//    )
+//
+//	# Verify consistency of the parent hash with respect to the previous execution payload header
+//	if is_merge_complete(state):
+//	    assert payload.parent_hash == state.latest_execution_payload_header.block_hash
+//	# Verify random
+//	assert payload.random == get_randao_mix(state, get_current_epoch(state))
+//	# Verify timestamp
+//	assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
+//	# Verify the execution payload is valid
+//	assert execution_engine.execute_payload(payload)
+//	# Cache execution payload header
+//	state.latest_execution_payload_header = ExecutionPayloadHeader(
+//	    parent_hash=payload.parent_hash,
+//	    FeeRecipient=payload.FeeRecipient,
+//	    state_root=payload.state_root,
+//	    receipt_root=payload.receipt_root,
+//	    logs_bloom=payload.logs_bloom,
+//	    random=payload.random,
+//	    block_number=payload.block_number,
+//	    gas_limit=payload.gas_limit,
+//	    gas_used=payload.gas_used,
+//	    timestamp=payload.timestamp,
+//	    extra_data=payload.extra_data,
+//	    base_fee_per_gas=payload.base_fee_per_gas,
+//	    block_hash=payload.block_hash,
+//	    transactions_root=hash_tree_root(payload.transactions),
+//	)
 func ProcessPayload(st state.BeaconState, payload interfaces.ExecutionData) (state.BeaconState, error) {
+	if st.Version() >= version.Capella {
+		withdrawals, err := payload.Withdrawals()
+		if err != nil {
+			return nil, errors.Wrap(err, "could not get payload withdrawals")
+		}
+		st, err = ProcessWithdrawals(st, withdrawals)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not process withdrawals")
+		}
+	}
 	if err := ValidatePayloadWhenMergeCompletes(st, payload); err != nil {
 		return nil, err
 	}
 	if err := ValidatePayload(st, payload); err != nil {
 		return nil, err
 	}
-	header, err := blocks.PayloadToHeader(payload)
-	if err != nil {
-		return nil, err
-	}
-	wrappedHeader, err := blocks.WrappedExecutionPayloadHeader(header)
-	if err != nil {
-		return nil, err
-	}
-	if err := st.SetLatestExecutionPayloadHeader(wrappedHeader); err != nil {
+	if err := st.SetLatestExecutionPayloadHeader(payload); err != nil {
 		return nil, err
 	}
 	return st, nil
@@ -271,7 +282,7 @@ func ProcessPayloadHeader(st state.BeaconState, header interfaces.ExecutionData)

 // GetBlockPayloadHash returns the hash of the execution payload of the block
 func GetBlockPayloadHash(blk interfaces.BeaconBlock) ([32]byte, error) {
-	payloadHash := [32]byte{}
+	var payloadHash [32]byte
 	if IsPreBellatrixVersion(blk.Version()) {
 		return payloadHash, nil
 	}
--- a/beacon-chain/core/blocks/payload_test.go
+++ b/beacon-chain/core/blocks/payload_test.go
@@ -203,6 +203,13 @@ func Test_IsMergeComplete(t *testing.T) {
 	}
 }

+func Test_IsMergeCompleteCapella(t *testing.T) {
+	st, _ := util.DeterministicGenesisStateCapella(t, 1)
+	got, err := blocks.IsMergeTransitionComplete(st)
+	require.NoError(t, err)
+	require.Equal(t, got, true)
+}
+
 func Test_IsExecutionBlock(t *testing.T) {
 	tests := []struct {
 		name    string
@@ -237,6 +244,16 @@ func Test_IsExecutionBlock(t *testing.T) {
 	}
 }

+func Test_IsExecutionBlockCapella(t *testing.T) {
+	blk := util.NewBeaconBlockCapella()
+	blk.Block.Body.ExecutionPayload = emptyPayloadCapella()
+	wrappedBlock, err := consensusblocks.NewBeaconBlock(blk.Block)
+	require.NoError(t, err)
+	got, err := blocks.IsExecutionBlock(wrappedBlock.Body())
+	require.NoError(t, err)
+	require.Equal(t, false, got)
+}
+
 func Test_IsExecutionEnabled(t *testing.T) {
 	tests := []struct {
 		name        string
@@ -583,6 +600,21 @@ func Test_ProcessPayload(t *testing.T) {
 	}
 }

+func Test_ProcessPayloadCapella(t *testing.T) {
+	st, _ := util.DeterministicGenesisStateCapella(t, 1)
+	header, err := emptyPayloadHeaderCapella()
+	require.NoError(t, err)
+	require.NoError(t, st.SetLatestExecutionPayloadHeader(header))
+	payload := emptyPayloadCapella()
+	random, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
+	require.NoError(t, err)
+	payload.PrevRandao = random
+	wrapped, err := consensusblocks.WrappedExecutionPayloadCapella(payload)
+	require.NoError(t, err)
+	_, err = blocks.ProcessPayload(st, wrapped)
+	require.NoError(t, err)
+}
+
 func Test_ProcessPayloadHeader(t *testing.T) {
 	st, _ := util.DeterministicGenesisStateBellatrix(t, 1)
 	random, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
@@ -828,6 +860,22 @@ func emptyPayloadHeader() (interfaces.ExecutionData, error) {
 	})
 }

+func emptyPayloadHeaderCapella() (interfaces.ExecutionData, error) {
+	return consensusblocks.WrappedExecutionPayloadHeaderCapella(&enginev1.ExecutionPayloadHeaderCapella{
+		ParentHash:       make([]byte, fieldparams.RootLength),
+		FeeRecipient:     make([]byte, fieldparams.FeeRecipientLength),
+		StateRoot:        make([]byte, fieldparams.RootLength),
+		ReceiptsRoot:     make([]byte, fieldparams.RootLength),
+		LogsBloom:        make([]byte, fieldparams.LogsBloomLength),
+		PrevRandao:       make([]byte, fieldparams.RootLength),
+		BaseFeePerGas:    make([]byte, fieldparams.RootLength),
+		BlockHash:        make([]byte, fieldparams.RootLength),
+		TransactionsRoot: make([]byte, fieldparams.RootLength),
+		WithdrawalsRoot:  make([]byte, fieldparams.RootLength),
+		ExtraData:        make([]byte, 0),
+	})
+}
+
 func emptyPayload() *enginev1.ExecutionPayload {
 	return &enginev1.ExecutionPayload{
 		ParentHash:    make([]byte, fieldparams.RootLength),
@@ -842,3 +890,19 @@ func emptyPayload() *enginev1.ExecutionPayload {
 		ExtraData:     make([]byte, 0),
 	}
 }
+
+func emptyPayloadCapella() *enginev1.ExecutionPayloadCapella {
+	return &enginev1.ExecutionPayloadCapella{
+		ParentHash:    make([]byte, fieldparams.RootLength),
+		FeeRecipient:  make([]byte, fieldparams.FeeRecipientLength),
+		StateRoot:     make([]byte, fieldparams.RootLength),
+		ReceiptsRoot:  make([]byte, fieldparams.RootLength),
+		LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
+		PrevRandao:    make([]byte, fieldparams.RootLength),
+		BaseFeePerGas: make([]byte, fieldparams.RootLength),
+		BlockHash:     make([]byte, fieldparams.RootLength),
+		Transactions:  make([][]byte, 0),
+		Withdrawals:   make([]*enginev1.Withdrawal, 0),
+		ExtraData:     make([]byte, 0),
+	}
+}
--- a/beacon-chain/core/blocks/proposer_slashing.go
+++ b/beacon-chain/core/blocks/proposer_slashing.go
@@ -24,26 +24,27 @@ type slashValidatorFunc func(ctx context.Context, st state.BeaconState, vid type
 // slashing conditions if any slashable events occurred.
 //
 // Spec pseudocode definition:
-//   def process_proposer_slashing(state: BeaconState, proposer_slashing: ProposerSlashing) -> None:
-//    header_1 = proposer_slashing.signed_header_1.message
-//    header_2 = proposer_slashing.signed_header_2.message
 //
-//    # Verify header slots match
-//    assert header_1.slot == header_2.slot
-//    # Verify header proposer indices match
-//    assert header_1.proposer_index == header_2.proposer_index
-//    # Verify the headers are different
-//    assert header_1 != header_2
-//    # Verify the proposer is slashable
-//    proposer = state.validators[header_1.proposer_index]
-//    assert is_slashable_validator(proposer, get_current_epoch(state))
-//    # Verify signatures
-//    for signed_header in (proposer_slashing.signed_header_1, proposer_slashing.signed_header_2):
-//        domain = get_domain(state, DOMAIN_BEACON_PROPOSER, compute_epoch_at_slot(signed_header.message.slot))
-//        signing_root = compute_signing_root(signed_header.message, domain)
-//        assert bls.Verify(proposer.pubkey, signing_root, signed_header.signature)
+//	def process_proposer_slashing(state: BeaconState, proposer_slashing: ProposerSlashing) -> None:
+//	 header_1 = proposer_slashing.signed_header_1.message
+//	 header_2 = proposer_slashing.signed_header_2.message
 //
-//    slash_validator(state, header_1.proposer_index)
+//	 # Verify header slots match
+//	 assert header_1.slot == header_2.slot
+//	 # Verify header proposer indices match
+//	 assert header_1.proposer_index == header_2.proposer_index
+//	 # Verify the headers are different
+//	 assert header_1 != header_2
+//	 # Verify the proposer is slashable
+//	 proposer = state.validators[header_1.proposer_index]
+//	 assert is_slashable_validator(proposer, get_current_epoch(state))
+//	 # Verify signatures
+//	 for signed_header in (proposer_slashing.signed_header_1, proposer_slashing.signed_header_2):
+//	     domain = get_domain(state, DOMAIN_BEACON_PROPOSER, compute_epoch_at_slot(signed_header.message.slot))
+//	     signing_root = compute_signing_root(signed_header.message, domain)
+//	     assert bls.Verify(proposer.pubkey, signing_root, signed_header.signature)
+//
+//	 slash_validator(state, header_1.proposer_index)
 func ProcessProposerSlashings(
 	ctx context.Context,
 	beaconState state.BeaconState,
@@ -81,7 +82,7 @@ func ProcessProposerSlashing(
 		slashingQuotient = cfg.MinSlashingPenaltyQuotient
 	case beaconState.Version() == version.Altair:
 		slashingQuotient = cfg.MinSlashingPenaltyQuotientAltair
-	case beaconState.Version() == version.Bellatrix:
+	case beaconState.Version() >= version.Bellatrix:
 		slashingQuotient = cfg.MinSlashingPenaltyQuotientBellatrix
 	default:
 		return nil, errors.New("unknown state version")
--- a/beacon-chain/core/blocks/proposer_slashing_test.go
+++ b/beacon-chain/core/blocks/proposer_slashing_test.go
@@ -282,6 +282,54 @@ func TestProcessProposerSlashings_AppliesCorrectStatusBellatrix(t *testing.T) {
 	require.Equal(t, uint64(32000000000), newState.Balances()[2])
 }

+func TestProcessProposerSlashings_AppliesCorrectStatusCapella(t *testing.T) {
+	// We test the case when data is correct and verify the validator
+	// registry has been updated.
+	beaconState, privKeys := util.DeterministicGenesisStateCapella(t, 100)
+	proposerIdx := types.ValidatorIndex(1)
+
+	header1 := &ethpb.SignedBeaconBlockHeader{
+		Header: util.HydrateBeaconHeader(&ethpb.BeaconBlockHeader{
+			ProposerIndex: proposerIdx,
+			StateRoot:     bytesutil.PadTo([]byte("A"), 32),
+		}),
+	}
+	var err error
+	header1.Signature, err = signing.ComputeDomainAndSign(beaconState, 0, header1.Header, params.BeaconConfig().DomainBeaconProposer, privKeys[proposerIdx])
+	require.NoError(t, err)
+
+	header2 := util.HydrateSignedBeaconHeader(&ethpb.SignedBeaconBlockHeader{
+		Header: &ethpb.BeaconBlockHeader{
+			ProposerIndex: proposerIdx,
+			StateRoot:     bytesutil.PadTo([]byte("B"), 32),
+		},
+	})
+	header2.Signature, err = signing.ComputeDomainAndSign(beaconState, 0, header2.Header, params.BeaconConfig().DomainBeaconProposer, privKeys[proposerIdx])
+	require.NoError(t, err)
+
+	slashings := []*ethpb.ProposerSlashing{
+		{
+			Header_1: header1,
+			Header_2: header2,
+		},
+	}
+
+	block := util.NewBeaconBlock()
+	block.Block.Body.ProposerSlashings = slashings
+
+	newState, err := blocks.ProcessProposerSlashings(context.Background(), beaconState, block.Block.Body.ProposerSlashings, v.SlashValidator)
+	require.NoError(t, err)
+
+	newStateVals := newState.Validators()
+	if newStateVals[1].ExitEpoch != beaconState.Validators()[1].ExitEpoch {
+		t.Errorf("Proposer with index 1 did not correctly exit,"+"wanted slot:%d, got:%d",
+			newStateVals[1].ExitEpoch, beaconState.Validators()[1].ExitEpoch)
+	}
+
+	require.Equal(t, uint64(31000000000), newState.Balances()[1])
+	require.Equal(t, uint64(32000000000), newState.Balances()[2])
+}
+
 func TestVerifyProposerSlashing(t *testing.T) {
 	type args struct {
 		beaconState state.BeaconState
--- a/beacon-chain/core/blocks/randao.go
+++ b/beacon-chain/core/blocks/randao.go
@@ -17,15 +17,16 @@ import (
 // in the beacon state's latest randao mixes slice.
 //
 // Spec pseudocode definition:
-//   def process_randao(state: BeaconState, body: BeaconBlockBody) -> None:
-//    epoch = get_current_epoch(state)
-//    # Verify RANDAO reveal
-//    proposer = state.validators[get_beacon_proposer_index(state)]
-//    signing_root = compute_signing_root(epoch, get_domain(state, DOMAIN_RANDAO))
-//    assert bls.Verify(proposer.pubkey, signing_root, body.randao_reveal)
-//    # Mix in RANDAO reveal
-//    mix = xor(get_randao_mix(state, epoch), hash(body.randao_reveal))
-//    state.randao_mixes[epoch % EPOCHS_PER_HISTORICAL_VECTOR] = mix
+//
+//	def process_randao(state: BeaconState, body: BeaconBlockBody) -> None:
+//	 epoch = get_current_epoch(state)
+//	 # Verify RANDAO reveal
+//	 proposer = state.validators[get_beacon_proposer_index(state)]
+//	 signing_root = compute_signing_root(epoch, get_domain(state, DOMAIN_RANDAO))
+//	 assert bls.Verify(proposer.pubkey, signing_root, body.randao_reveal)
+//	 # Mix in RANDAO reveal
+//	 mix = xor(get_randao_mix(state, epoch), hash(body.randao_reveal))
+//	 state.randao_mixes[epoch % EPOCHS_PER_HISTORICAL_VECTOR] = mix
 func ProcessRandao(
 	ctx context.Context,
 	beaconState state.BeaconState,
@@ -56,11 +57,12 @@ func ProcessRandao(
 // in the beacon state's latest randao mixes slice.
 //
 // Spec pseudocode definition:
-//     # Mix it in
-//     state.latest_randao_mixes[get_current_epoch(state) % LATEST_RANDAO_MIXES_LENGTH] = (
-//         xor(get_randao_mix(state, get_current_epoch(state)),
-//             hash(body.randao_reveal))
-//     )
+//
+//	# Mix it in
+//	state.latest_randao_mixes[get_current_epoch(state) % LATEST_RANDAO_MIXES_LENGTH] = (
+//	    xor(get_randao_mix(state, get_current_epoch(state)),
+//	        hash(body.randao_reveal))
+//	)
 func ProcessRandaoNoVerify(
 	beaconState state.BeaconState,
 	randaoReveal []byte,
--- a/beacon-chain/core/blocks/signature.go
+++ b/beacon-chain/core/blocks/signature.go
@@ -19,7 +19,7 @@ import (
 )

 // retrieves the signature batch from the raw data, public key,signature and domain provided.
-func signatureBatch(signedData, pub, signature, domain []byte) (*bls.SignatureBatch, error) {
+func signatureBatch(signedData, pub, signature, domain []byte, desc string) (*bls.SignatureBatch, error) {
 	publicKey, err := bls.PublicKeyFromBytes(pub)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not convert bytes to public key")
@@ -33,15 +33,16 @@ func signatureBatch(signedData, pub, signature, domain []byte) (*bls.SignatureBa
 		return nil, errors.Wrap(err, "could not hash container")
 	}
 	return &bls.SignatureBatch{
-		Signatures: [][]byte{signature},
-		PublicKeys: []bls.PublicKey{publicKey},
-		Messages:   [][32]byte{root},
+		Signatures:   [][]byte{signature},
+		PublicKeys:   []bls.PublicKey{publicKey},
+		Messages:     [][32]byte{root},
+		Descriptions: []string{desc},
 	}, nil
 }

 // verifies the signature from the raw data, public key and domain provided.
 func verifySignature(signedData, pub, signature, domain []byte) error {
-	set, err := signatureBatch(signedData, pub, signature, domain)
+	set, err := signatureBatch(signedData, pub, signature, domain, signing.UnknownSignature)
 	if err != nil {
 		return err
 	}
@@ -146,7 +147,7 @@ func RandaoSignatureBatch(
 	if err != nil {
 		return nil, err
 	}
-	set, err := signatureBatch(buf, proposerPub, reveal, domain)
+	set, err := signatureBatch(buf, proposerPub, reveal, domain, signing.RandaoSignature)
 	if err != nil {
 		return nil, err
 	}
@@ -186,6 +187,7 @@ func createAttestationSignatureBatch(
 	sigs := make([][]byte, len(atts))
 	pks := make([]bls.PublicKey, len(atts))
 	msgs := make([][32]byte, len(atts))
+	descs := make([]string, len(atts))
 	for i, a := range atts {
 		sigs[i] = a.Signature
 		c, err := helpers.BeaconCommitteeFromState(ctx, beaconState, a.Data.Slot, a.Data.CommitteeIndex)
@@ -216,11 +218,14 @@ func createAttestationSignatureBatch(
 			return nil, errors.Wrap(err, "could not get signing root of object")
 		}
 		msgs[i] = root
+
+		descs[i] = signing.AttestationSignature
 	}
 	return &bls.SignatureBatch{
-		Signatures: sigs,
-		PublicKeys: pks,
-		Messages:   msgs,
+		Signatures:   sigs,
+		PublicKeys:   pks,
+		Messages:     msgs,
+		Descriptions: descs,
 	}, nil
 }

--- a/beacon-chain/core/blocks/withdrawals.go
+++ b/beacon-chain/core/blocks/withdrawals.go
@@ -3,45 +3,92 @@ package blocks
 import (
 	"bytes"

+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/signing"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/crypto/hash/htr"
-	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	"github.com/prysmaticlabs/prysm/v3/crypto/bls"
+	"github.com/prysmaticlabs/prysm/v3/crypto/hash"
+	"github.com/prysmaticlabs/prysm/v3/encoding/ssz"
+	enginev1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
+	ethpbv2 "github.com/prysmaticlabs/prysm/v3/proto/eth/v2"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v3/time/slots"
+	"github.com/prysmaticlabs/prysm/v3/runtime/version"
 )

 const executionToBLSPadding = 12

-// ProcessBLSToExecutionChange validates a SignedBLSToExecution message and
+func ProcessBLSToExecutionChanges(
+	st state.BeaconState,
+	signed interfaces.SignedBeaconBlock) (state.BeaconState, error) {
+	if signed.Version() < version.Capella {
+		return st, nil
+	}
+	changes, err := signed.Block().Body().BLSToExecutionChanges()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get BLSToExecutionChanges")
+	}
+	// Return early if no changes
+	if len(changes) == 0 {
+		return st, nil
+	}
+	for _, change := range changes {
+		st, err = processBLSToExecutionChange(st, change)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not process BLSToExecutionChange")
+		}
+	}
+	return st, nil
+}
+
+// processBLSToExecutionChange validates a SignedBLSToExecution message and
 // changes the validator's withdrawal address accordingly.
 //
 // Spec pseudocode definition:
 //
-//def process_bls_to_execution_change(state: BeaconState, signed_address_change: SignedBLSToExecutionChange) -> None:
-//    validator = state.validators[address_change.validator_index]
+// def process_bls_to_execution_change(state: BeaconState, signed_address_change: SignedBLSToExecutionChange) -> None:
 //
-//    assert validator.withdrawal_credentials[:1] == BLS_WITHDRAWAL_PREFIX
-//    assert validator.withdrawal_credentials[1:] == hash(address_change.from_bls_pubkey)[1:]
+//	validator = state.validators[address_change.validator_index]
 //
-//    domain = get_domain(state, DOMAIN_BLS_TO_EXECUTION_CHANGE)
-//    signing_root = compute_signing_root(address_change, domain)
-//    assert bls.Verify(address_change.from_bls_pubkey, signing_root, signed_address_change.signature)
+//	assert validator.withdrawal_credentials[:1] == BLS_WITHDRAWAL_PREFIX
+//	assert validator.withdrawal_credentials[1:] == hash(address_change.from_bls_pubkey)[1:]
 //
-//    validator.withdrawal_credentials = (
-//        ETH1_ADDRESS_WITHDRAWAL_PREFIX
-//        + b'\x00' * 11
-//        + address_change.to_execution_address
-//    )
+//	domain = get_domain(state, DOMAIN_BLS_TO_EXECUTION_CHANGE)
+//	signing_root = compute_signing_root(address_change, domain)
+//	assert bls.Verify(address_change.from_bls_pubkey, signing_root, signed_address_change.signature)
 //
-func ProcessBLSToExecutionChange(st state.BeaconState, signed *ethpb.SignedBLSToExecutionChange) (state.BeaconState, error) {
+//	validator.withdrawal_credentials = (
+//	    ETH1_ADDRESS_WITHDRAWAL_PREFIX
+//	    + b'\x00' * 11
+//	    + address_change.to_execution_address
+//	)
+func processBLSToExecutionChange(st state.BeaconState, signed *ethpb.SignedBLSToExecutionChange) (state.BeaconState, error) {
+	// Checks that the message passes the validation conditions.
+	val, err := ValidateBLSToExecutionChange(st, signed)
+	if err != nil {
+		return nil, err
+	}
+
+	message := signed.Message
+	newCredentials := make([]byte, executionToBLSPadding)
+	newCredentials[0] = params.BeaconConfig().ETH1AddressWithdrawalPrefixByte
+	val.WithdrawalCredentials = append(newCredentials, message.ToExecutionAddress...)
+	err = st.UpdateValidatorAtIndex(message.ValidatorIndex, val)
+	return st, err
+}
+
+// ValidateBLSToExecutionChange validates the execution change message against the state and returns the
+// validator referenced by the message.
+func ValidateBLSToExecutionChange(st state.ReadOnlyBeaconState, signed *ethpb.SignedBLSToExecutionChange) (*ethpb.Validator, error) {
 	if signed == nil {
-		return st, errNilSignedWithdrawalMessage
+		return nil, errNilSignedWithdrawalMessage
 	}
 	message := signed.Message
 	if message == nil {
-		return st, errNilWithdrawalMessage
+		return nil, errNilWithdrawalMessage
 	}

 	val, err := st.ValidatorAtIndex(message.ValidatorIndex)
@@ -55,24 +102,113 @@ func ProcessBLSToExecutionChange(st state.BeaconState, signed *ethpb.SignedBLSTo

 	// hash the public key and verify it matches the withdrawal credentials
 	fromPubkey := message.FromBlsPubkey
-	pubkeyChunks := [][32]byte{bytesutil.ToBytes32(fromPubkey[:32]), bytesutil.ToBytes32(fromPubkey[32:])}
-	digest := make([][32]byte, 1)
-	htr.VectorizedSha256(pubkeyChunks, digest)
-	if !bytes.Equal(digest[0][1:], cred[1:]) {
+	hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+	digest := hashFn.Hash(fromPubkey)
+	if !bytes.Equal(digest[1:], cred[1:]) {
 		return nil, errInvalidWithdrawalCredentials
 	}
-
-	epoch := slots.ToEpoch(st.Slot())
-	domain, err := signing.Domain(st.Fork(), epoch, params.BeaconConfig().DomainBLSToExecutionChange, st.GenesisValidatorsRoot())
-	if err != nil {
-		return nil, err
-	}
-	if err := signing.VerifySigningRoot(message, fromPubkey, signed.Signature, domain); err != nil {
-		return nil, signing.ErrSigFailedToVerify
-	}
-	newCredentials := make([]byte, executionToBLSPadding)
-	newCredentials[0] = params.BeaconConfig().ETH1AddressWithdrawalPrefixByte
-	val.WithdrawalCredentials = append(newCredentials, message.ToExecutionAddress...)
-	err = st.UpdateValidatorAtIndex(message.ValidatorIndex, val)
-	return st, err
+	return val, nil
+}
+
+func ProcessWithdrawals(st state.BeaconState, withdrawals []*enginev1.Withdrawal) (state.BeaconState, error) {
+	expected, err := st.ExpectedWithdrawals()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get expected withdrawals")
+	}
+	if len(expected) != len(withdrawals) {
+		return nil, errInvalidWithdrawalNumber
+	}
+	for i, withdrawal := range withdrawals {
+		if withdrawal.Index != expected[i].Index {
+			return nil, errInvalidWithdrawalIndex
+		}
+		if withdrawal.ValidatorIndex != expected[i].ValidatorIndex {
+			return nil, errInvalidValidatorIndex
+		}
+		if !bytes.Equal(withdrawal.Address, expected[i].Address) {
+			return nil, errInvalidExecutionAddress
+		}
+		if withdrawal.Amount != expected[i].Amount {
+			return nil, errInvalidWithdrawalAmount
+		}
+		err := helpers.DecreaseBalance(st, withdrawal.ValidatorIndex, withdrawal.Amount)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not decrease balance")
+		}
+	}
+	if len(withdrawals) > 0 {
+		if err := st.SetNextWithdrawalIndex(withdrawals[len(withdrawals)-1].Index + 1); err != nil {
+			return nil, errors.Wrap(err, "could not set next withdrawal index")
+		}
+	}
+	var nextValidatorIndex types.ValidatorIndex
+	if uint64(len(withdrawals)) < params.BeaconConfig().MaxWithdrawalsPerPayload {
+		nextValidatorIndex, err = st.NextWithdrawalValidatorIndex()
+		if err != nil {
+			return nil, errors.Wrap(err, "could not get next withdrawal validator index")
+		}
+		nextValidatorIndex += types.ValidatorIndex(params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep)
+		nextValidatorIndex = nextValidatorIndex % types.ValidatorIndex(st.NumValidators())
+	} else {
+		nextValidatorIndex = withdrawals[len(withdrawals)-1].ValidatorIndex + 1
+		if nextValidatorIndex == types.ValidatorIndex(st.NumValidators()) {
+			nextValidatorIndex = 0
+		}
+	}
+	if err := st.SetNextWithdrawalValidatorIndex(nextValidatorIndex); err != nil {
+		return nil, errors.Wrap(err, "could not set next withdrawal validator index")
+	}
+	return st, nil
+}
+
+func BLSChangesSignatureBatch(
+	st state.ReadOnlyBeaconState,
+	changes []*ethpb.SignedBLSToExecutionChange,
+) (*bls.SignatureBatch, error) {
+	// Return early if no changes
+	if len(changes) == 0 {
+		return bls.NewSet(), nil
+	}
+	batch := &bls.SignatureBatch{
+		Signatures:   make([][]byte, len(changes)),
+		PublicKeys:   make([]bls.PublicKey, len(changes)),
+		Messages:     make([][32]byte, len(changes)),
+		Descriptions: make([]string, len(changes)),
+	}
+	c := params.BeaconConfig()
+	domain, err := signing.ComputeDomain(c.DomainBLSToExecutionChange, c.GenesisForkVersion, st.GenesisValidatorsRoot())
+	if err != nil {
+		return nil, errors.Wrap(err, "could not compute signing domain")
+	}
+	for i, change := range changes {
+		batch.Signatures[i] = change.Signature
+		publicKey, err := bls.PublicKeyFromBytes(change.Message.FromBlsPubkey)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not convert bytes to public key")
+		}
+		batch.PublicKeys[i] = publicKey
+		htr, err := signing.SigningData(change.Message.HashTreeRoot, domain)
+		if err != nil {
+			return nil, errors.Wrap(err, "could not compute BLSToExecutionChange signing data")
+		}
+		batch.Messages[i] = htr
+		batch.Descriptions[i] = signing.BlsChangeSignature
+	}
+	return batch, nil
+}
+
+// VerifyBLSChangeSignature checks the signature in the SignedBLSToExecutionChange message.
+// It validates the signature with the Capella fork version if the passed state
+// is from a previous fork.
+func VerifyBLSChangeSignature(
+	st state.BeaconState,
+	change *ethpbv2.SignedBLSToExecutionChange,
+) error {
+	c := params.BeaconConfig()
+	domain, err := signing.ComputeDomain(c.DomainBLSToExecutionChange, c.GenesisForkVersion, st.GenesisValidatorsRoot())
+	if err != nil {
+		return errors.Wrap(err, "could not compute signing domain")
+	}
+	publicKey := change.Message.FromBlsPubkey
+	return signing.VerifySigningRoot(change.Message, publicKey, change.Signature, domain)
 }
--- a/beacon-chain/core/blocks/withdrawals_test.go
+++ b/beacon-chain/core/blocks/withdrawals_test.go
@@ -1,18 +1,26 @@
 package blocks_test

 import (
+	"math/rand"
 	"testing"

 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/blocks"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/signing"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/time"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
+	consensusblocks "github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/crypto/bls"
-	"github.com/prysmaticlabs/prysm/v3/crypto/hash/htr"
-	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v3/crypto/bls/common"
+	"github.com/prysmaticlabs/prysm/v3/crypto/hash"
+	"github.com/prysmaticlabs/prysm/v3/encoding/ssz"
+	enginev1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
+	"github.com/prysmaticlabs/prysm/v3/proto/migration"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
+	"github.com/prysmaticlabs/prysm/v3/time/slots"
 )

 func TestProcessBLSToExecutionChange(t *testing.T) {
@@ -27,14 +35,13 @@ func TestProcessBLSToExecutionChange(t *testing.T) {
 			FromBlsPubkey:      pubkey,
 		}

-		pubkeyChunks := [][32]byte{bytesutil.ToBytes32(pubkey[:32]), bytesutil.ToBytes32(pubkey[32:])}
-		digest := make([][32]byte, 1)
-		htr.VectorizedSha256(pubkeyChunks, digest)
-		digest[0][0] = params.BeaconConfig().BLSWithdrawalPrefixByte
+		hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+		digest := hashFn.Hash(pubkey)
+		digest[0] = params.BeaconConfig().BLSWithdrawalPrefixByte

 		registry := []*ethpb.Validator{
 			{
-				WithdrawalCredentials: digest[0][:],
+				WithdrawalCredentials: digest[:],
 			},
 		}
 		st, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
@@ -63,6 +70,47 @@ func TestProcessBLSToExecutionChange(t *testing.T) {

 		require.DeepEqual(t, message.ToExecutionAddress, val.WithdrawalCredentials[12:])
 	})
+	t.Run("happy case only validation", func(t *testing.T) {
+		priv, err := bls.RandKey()
+		require.NoError(t, err)
+		pubkey := priv.PublicKey().Marshal()
+
+		message := &ethpb.BLSToExecutionChange{
+			ToExecutionAddress: []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13},
+			ValidatorIndex:     0,
+			FromBlsPubkey:      pubkey,
+		}
+
+		hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+		digest := hashFn.Hash(pubkey)
+		digest[0] = params.BeaconConfig().BLSWithdrawalPrefixByte
+
+		registry := []*ethpb.Validator{
+			{
+				WithdrawalCredentials: digest[:],
+			},
+		}
+		st, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
+			Validators: registry,
+			Fork: &ethpb.Fork{
+				CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+				PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+			},
+			Slot: params.BeaconConfig().SlotsPerEpoch * 5,
+		})
+		require.NoError(t, err)
+
+		signature, err := signing.ComputeDomainAndSign(st, time.CurrentEpoch(st), message, params.BeaconConfig().DomainBLSToExecutionChange, priv)
+		require.NoError(t, err)
+
+		signed := &ethpb.SignedBLSToExecutionChange{
+			Message:   message,
+			Signature: signature,
+		}
+		val, err := blocks.ValidateBLSToExecutionChange(st, signed)
+		require.NoError(t, err)
+		require.DeepEqual(t, digest[:], val.WithdrawalCredentials)
+	})

 	t.Run("non-existent validator", func(t *testing.T) {
 		priv, err := bls.RandKey()
@@ -75,14 +123,13 @@ func TestProcessBLSToExecutionChange(t *testing.T) {
 			FromBlsPubkey:      pubkey,
 		}

-		pubkeyChunks := [][32]byte{bytesutil.ToBytes32(pubkey[:32]), bytesutil.ToBytes32(pubkey[32:])}
-		digest := make([][32]byte, 1)
-		htr.VectorizedSha256(pubkeyChunks, digest)
-		digest[0][0] = params.BeaconConfig().BLSWithdrawalPrefixByte
+		hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+		digest := hashFn.Hash(pubkey)
+		digest[0] = params.BeaconConfig().BLSWithdrawalPrefixByte

 		registry := []*ethpb.Validator{
 			{
-				WithdrawalCredentials: digest[0][:],
+				WithdrawalCredentials: digest[:],
 			},
 		}
 		st, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
@@ -155,15 +202,13 @@ func TestProcessBLSToExecutionChange(t *testing.T) {
 			ValidatorIndex:     0,
 			FromBlsPubkey:      pubkey,
 		}
-
-		pubkeyChunks := [][32]byte{bytesutil.ToBytes32(pubkey[:32]), bytesutil.ToBytes32(pubkey[32:])}
-		digest := make([][32]byte, 1)
-		htr.VectorizedSha256(pubkeyChunks, digest)
-		digest[0][0] = params.BeaconConfig().BLSWithdrawalPrefixByte
+		hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+		digest := hashFn.Hash(pubkey)
+		digest[0] = params.BeaconConfig().BLSWithdrawalPrefixByte

 		registry := []*ethpb.Validator{
 			{
-				WithdrawalCredentials: digest[0][:],
+				WithdrawalCredentials: digest[:],
 			},
 		}
 		registry[0].WithdrawalCredentials[0] = params.BeaconConfig().ETH1AddressWithdrawalPrefixByte
@@ -191,3 +236,711 @@ func TestProcessBLSToExecutionChange(t *testing.T) {

 	})
 }
+
+func TestProcessWithdrawals(t *testing.T) {
+	const (
+		currentEpoch             = types.Epoch(10)
+		epochInFuture            = types.Epoch(12)
+		epochInPast              = types.Epoch(8)
+		numValidators            = 128
+		notWithdrawableIndex     = 127
+		notPartiallyWithdrawable = 126
+		maxSweep                 = uint64(80)
+	)
+	maxEffectiveBalance := params.BeaconConfig().MaxEffectiveBalance
+
+	type args struct {
+		Name                         string
+		NextWithdrawalValidatorIndex types.ValidatorIndex
+		NextWithdrawalIndex          uint64
+		FullWithdrawalIndices        []types.ValidatorIndex
+		PartialWithdrawalIndices     []types.ValidatorIndex
+		Withdrawals                  []*enginev1.Withdrawal
+	}
+	type control struct {
+		NextWithdrawalValidatorIndex types.ValidatorIndex
+		NextWithdrawalIndex          uint64
+		ExpectedError                bool
+		Balances                     map[uint64]uint64
+	}
+	type Test struct {
+		Args    args
+		Control control
+	}
+	executionAddress := func(i types.ValidatorIndex) []byte {
+		wc := make([]byte, 20)
+		wc[19] = byte(i)
+		return wc
+	}
+	withdrawalAmount := func(i types.ValidatorIndex) uint64 {
+		return maxEffectiveBalance + uint64(i)*100000
+	}
+	fullWithdrawal := func(i types.ValidatorIndex, idx uint64) *enginev1.Withdrawal {
+		return &enginev1.Withdrawal{
+			Index:          idx,
+			ValidatorIndex: i,
+			Address:        executionAddress(i),
+			Amount:         withdrawalAmount(i),
+		}
+	}
+	partialWithdrawal := func(i types.ValidatorIndex, idx uint64) *enginev1.Withdrawal {
+		return &enginev1.Withdrawal{
+			Index:          idx,
+			ValidatorIndex: i,
+			Address:        executionAddress(i),
+			Amount:         withdrawalAmount(i) - maxEffectiveBalance,
+		}
+	}
+	tests := []Test{
+		{
+			Args: args{
+				Name:                         "success no withdrawals",
+				NextWithdrawalValidatorIndex: 10,
+				NextWithdrawalIndex:          3,
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 90,
+				NextWithdrawalIndex:          3,
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success one full withdrawal",
+				NextWithdrawalIndex:          3,
+				NextWithdrawalValidatorIndex: 5,
+				FullWithdrawalIndices:        []types.ValidatorIndex{70},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(70, 3),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 85,
+				NextWithdrawalIndex:          4,
+				Balances:                     map[uint64]uint64{70: 0},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success one partial withdrawal",
+				NextWithdrawalIndex:          21,
+				NextWithdrawalValidatorIndex: 120,
+				PartialWithdrawalIndices:     []types.ValidatorIndex{7},
+				Withdrawals: []*enginev1.Withdrawal{
+					partialWithdrawal(7, 21),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 72,
+				NextWithdrawalIndex:          22,
+				Balances:                     map[uint64]uint64{7: maxEffectiveBalance},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success many full withdrawals",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []types.ValidatorIndex{7, 19, 28, 1},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(7, 22), fullWithdrawal(19, 23), fullWithdrawal(28, 24),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 84,
+				NextWithdrawalIndex:          25,
+				Balances:                     map[uint64]uint64{7: 0, 19: 0, 28: 0},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "Less than max sweep at end",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []types.ValidatorIndex{80, 81, 82, 83},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(80, 22), fullWithdrawal(81, 23), fullWithdrawal(82, 24),
+					fullWithdrawal(83, 25),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 84,
+				NextWithdrawalIndex:          26,
+				Balances:                     map[uint64]uint64{80: 0, 81: 0, 82: 0, 83: 0},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "Less than max sweep and beginning",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []types.ValidatorIndex{4, 5, 6},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(4, 22), fullWithdrawal(5, 23), fullWithdrawal(6, 24),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 84,
+				NextWithdrawalIndex:          25,
+				Balances:                     map[uint64]uint64{4: 0, 5: 0, 6: 0},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success many partial withdrawals",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				PartialWithdrawalIndices:     []types.ValidatorIndex{7, 19, 28},
+				Withdrawals: []*enginev1.Withdrawal{
+					partialWithdrawal(7, 22), partialWithdrawal(19, 23), partialWithdrawal(28, 24),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 84,
+				NextWithdrawalIndex:          25,
+				Balances: map[uint64]uint64{
+					7:  maxEffectiveBalance,
+					19: maxEffectiveBalance,
+					28: maxEffectiveBalance,
+				},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success many withdrawals",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 88,
+				FullWithdrawalIndices:        []types.ValidatorIndex{7, 19, 28},
+				PartialWithdrawalIndices:     []types.ValidatorIndex{2, 1, 89, 15},
+				Withdrawals: []*enginev1.Withdrawal{
+					partialWithdrawal(89, 22), partialWithdrawal(1, 23), partialWithdrawal(2, 24),
+					fullWithdrawal(7, 25), partialWithdrawal(15, 26), fullWithdrawal(19, 27),
+					fullWithdrawal(28, 28),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 40,
+				NextWithdrawalIndex:          29,
+				Balances: map[uint64]uint64{
+					7: 0, 19: 0, 28: 0,
+					2: maxEffectiveBalance, 1: maxEffectiveBalance, 89: maxEffectiveBalance,
+					15: maxEffectiveBalance,
+				},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success more than max fully withdrawals",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 0,
+				FullWithdrawalIndices:        []types.ValidatorIndex{1, 2, 3, 4, 5, 6, 7, 8, 9, 21, 22, 23, 24, 25, 26, 27, 29, 35, 89},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(1, 22), fullWithdrawal(2, 23), fullWithdrawal(3, 24),
+					fullWithdrawal(4, 25), fullWithdrawal(5, 26), fullWithdrawal(6, 27),
+					fullWithdrawal(7, 28), fullWithdrawal(8, 29), fullWithdrawal(9, 30),
+					fullWithdrawal(21, 31), fullWithdrawal(22, 32), fullWithdrawal(23, 33),
+					fullWithdrawal(24, 34), fullWithdrawal(25, 35), fullWithdrawal(26, 36),
+					fullWithdrawal(27, 37),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 28,
+				NextWithdrawalIndex:          38,
+				Balances: map[uint64]uint64{
+					1: 0, 2: 0, 3: 0, 4: 0, 5: 0, 6: 0, 7: 0, 8: 0, 9: 0,
+					21: 0, 22: 0, 23: 0, 24: 0, 25: 0, 26: 0, 27: 0,
+				},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "success more than max partially withdrawals",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 0,
+				PartialWithdrawalIndices:     []types.ValidatorIndex{1, 2, 3, 4, 5, 6, 7, 8, 9, 21, 22, 23, 24, 25, 26, 27, 29, 35, 89},
+				Withdrawals: []*enginev1.Withdrawal{
+					partialWithdrawal(1, 22), partialWithdrawal(2, 23), partialWithdrawal(3, 24),
+					partialWithdrawal(4, 25), partialWithdrawal(5, 26), partialWithdrawal(6, 27),
+					partialWithdrawal(7, 28), partialWithdrawal(8, 29), partialWithdrawal(9, 30),
+					partialWithdrawal(21, 31), partialWithdrawal(22, 32), partialWithdrawal(23, 33),
+					partialWithdrawal(24, 34), partialWithdrawal(25, 35), partialWithdrawal(26, 36),
+					partialWithdrawal(27, 37),
+				},
+			},
+			Control: control{
+				NextWithdrawalValidatorIndex: 28,
+				NextWithdrawalIndex:          38,
+				Balances: map[uint64]uint64{
+					1:  maxEffectiveBalance,
+					2:  maxEffectiveBalance,
+					3:  maxEffectiveBalance,
+					4:  maxEffectiveBalance,
+					5:  maxEffectiveBalance,
+					6:  maxEffectiveBalance,
+					7:  maxEffectiveBalance,
+					8:  maxEffectiveBalance,
+					9:  maxEffectiveBalance,
+					21: maxEffectiveBalance,
+					22: maxEffectiveBalance,
+					23: maxEffectiveBalance,
+					24: maxEffectiveBalance,
+					25: maxEffectiveBalance,
+					26: maxEffectiveBalance,
+					27: maxEffectiveBalance,
+				},
+			},
+		},
+		{
+			Args: args{
+				Name:                         "failure wrong number of partial withdrawal",
+				NextWithdrawalIndex:          21,
+				NextWithdrawalValidatorIndex: 37,
+				PartialWithdrawalIndices:     []types.ValidatorIndex{7},
+				Withdrawals: []*enginev1.Withdrawal{
+					partialWithdrawal(7, 21), partialWithdrawal(9, 22),
+				},
+			},
+			Control: control{
+				ExpectedError: true,
+			},
+		},
+		{
+			Args: args{
+				Name:                         "failure invalid withdrawal index",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []types.ValidatorIndex{7, 19, 28, 1},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(7, 22), fullWithdrawal(19, 23), fullWithdrawal(28, 25),
+					fullWithdrawal(1, 25),
+				},
+			},
+			Control: control{
+				ExpectedError: true,
+			},
+		},
+		{
+			Args: args{
+				Name:                         "failure invalid validator index",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []types.ValidatorIndex{7, 19, 28, 1},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(7, 22), fullWithdrawal(19, 23), fullWithdrawal(27, 24),
+					fullWithdrawal(1, 25),
+				},
+			},
+			Control: control{
+				ExpectedError: true,
+			},
+		},
+		{
+			Args: args{
+				Name:                         "failure invalid withdrawal amount",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []types.ValidatorIndex{7, 19, 28, 1},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(7, 22), fullWithdrawal(19, 23), partialWithdrawal(28, 24),
+					fullWithdrawal(1, 25),
+				},
+			},
+			Control: control{
+				ExpectedError: true,
+			},
+		},
+		{
+			Args: args{
+				Name:                         "failure validator not fully withdrawable",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				FullWithdrawalIndices:        []types.ValidatorIndex{notWithdrawableIndex},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(notWithdrawableIndex, 22),
+				},
+			},
+			Control: control{
+				ExpectedError: true,
+			},
+		},
+		{
+			Args: args{
+				Name:                         "failure validator not partially withdrawable",
+				NextWithdrawalIndex:          22,
+				NextWithdrawalValidatorIndex: 4,
+				PartialWithdrawalIndices:     []types.ValidatorIndex{notPartiallyWithdrawable},
+				Withdrawals: []*enginev1.Withdrawal{
+					fullWithdrawal(notPartiallyWithdrawable, 22),
+				},
+			},
+			Control: control{
+				ExpectedError: true,
+			},
+		},
+	}
+
+	checkPostState := func(t *testing.T, expected control, st state.BeaconState) {
+		l, err := st.NextWithdrawalValidatorIndex()
+		require.NoError(t, err)
+		require.Equal(t, expected.NextWithdrawalValidatorIndex, l)
+
+		n, err := st.NextWithdrawalIndex()
+		require.NoError(t, err)
+		require.Equal(t, expected.NextWithdrawalIndex, n)
+		balances := st.Balances()
+		for idx, bal := range expected.Balances {
+			require.Equal(t, bal, balances[idx])
+		}
+	}
+
+	prepareValidators := func(st *ethpb.BeaconStateCapella, arguments args) (state.BeaconState, error) {
+		validators := make([]*ethpb.Validator, numValidators)
+		st.Balances = make([]uint64, numValidators)
+		for i := range validators {
+			v := &ethpb.Validator{}
+			v.EffectiveBalance = maxEffectiveBalance
+			v.WithdrawableEpoch = epochInFuture
+			v.WithdrawalCredentials = make([]byte, 32)
+			v.WithdrawalCredentials[31] = byte(i)
+			st.Balances[i] = v.EffectiveBalance - uint64(rand.Intn(1000))
+			validators[i] = v
+		}
+		for _, idx := range arguments.FullWithdrawalIndices {
+			if idx != notWithdrawableIndex {
+				validators[idx].WithdrawableEpoch = epochInPast
+			}
+			st.Balances[idx] = withdrawalAmount(idx)
+			validators[idx].WithdrawalCredentials[0] = params.BeaconConfig().ETH1AddressWithdrawalPrefixByte
+		}
+		for _, idx := range arguments.PartialWithdrawalIndices {
+			validators[idx].WithdrawalCredentials[0] = params.BeaconConfig().ETH1AddressWithdrawalPrefixByte
+			st.Balances[idx] = withdrawalAmount(idx)
+		}
+		st.Validators = validators
+		return state_native.InitializeFromProtoCapella(st)
+	}
+
+	for _, test := range tests {
+		t.Run(test.Args.Name, func(t *testing.T) {
+			saved := params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep
+			params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep = maxSweep
+			if test.Args.Withdrawals == nil {
+				test.Args.Withdrawals = make([]*enginev1.Withdrawal, 0)
+			}
+			if test.Args.FullWithdrawalIndices == nil {
+				test.Args.FullWithdrawalIndices = make([]types.ValidatorIndex, 0)
+			}
+			if test.Args.PartialWithdrawalIndices == nil {
+				test.Args.PartialWithdrawalIndices = make([]types.ValidatorIndex, 0)
+			}
+			slot, err := slots.EpochStart(currentEpoch)
+			require.NoError(t, err)
+			spb := &ethpb.BeaconStateCapella{
+				Slot:                         slot,
+				NextWithdrawalValidatorIndex: test.Args.NextWithdrawalValidatorIndex,
+				NextWithdrawalIndex:          test.Args.NextWithdrawalIndex,
+			}
+			st, err := prepareValidators(spb, test.Args)
+			require.NoError(t, err)
+			post, err := blocks.ProcessWithdrawals(st, test.Args.Withdrawals)
+			if test.Control.ExpectedError {
+				require.NotNil(t, err)
+			} else {
+				require.NoError(t, err)
+				checkPostState(t, test.Control, post)
+			}
+			params.BeaconConfig().MaxValidatorsPerWithdrawalsSweep = saved
+		})
+	}
+}
+
+func TestProcessBLSToExecutionChanges(t *testing.T) {
+	spb := &ethpb.BeaconStateCapella{
+		Fork: &ethpb.Fork{
+			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+		},
+	}
+	numValidators := 10
+	validators := make([]*ethpb.Validator, numValidators)
+	blsChanges := make([]*ethpb.BLSToExecutionChange, numValidators)
+	spb.Balances = make([]uint64, numValidators)
+	privKeys := make([]common.SecretKey, numValidators)
+	maxEffectiveBalance := params.BeaconConfig().MaxEffectiveBalance
+	executionAddress := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13}
+
+	for i := range validators {
+		v := &ethpb.Validator{}
+		v.EffectiveBalance = maxEffectiveBalance
+		v.WithdrawableEpoch = params.BeaconConfig().FarFutureEpoch
+		v.WithdrawalCredentials = make([]byte, 32)
+		priv, err := bls.RandKey()
+		require.NoError(t, err)
+		privKeys[i] = priv
+		pubkey := priv.PublicKey().Marshal()
+
+		message := &ethpb.BLSToExecutionChange{
+			ToExecutionAddress: executionAddress,
+			ValidatorIndex:     types.ValidatorIndex(i),
+			FromBlsPubkey:      pubkey,
+		}
+
+		hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+		digest := hashFn.Hash(pubkey)
+		digest[0] = params.BeaconConfig().BLSWithdrawalPrefixByte
+		copy(v.WithdrawalCredentials, digest[:])
+		validators[i] = v
+		blsChanges[i] = message
+	}
+	spb.Validators = validators
+	st, err := state_native.InitializeFromProtoCapella(spb)
+	require.NoError(t, err)
+
+	signedChanges := make([]*ethpb.SignedBLSToExecutionChange, numValidators)
+	for i, message := range blsChanges {
+		signature, err := signing.ComputeDomainAndSign(st, time.CurrentEpoch(st), message, params.BeaconConfig().DomainBLSToExecutionChange, privKeys[i])
+		require.NoError(t, err)
+
+		signed := &ethpb.SignedBLSToExecutionChange{
+			Message:   message,
+			Signature: signature,
+		}
+		signedChanges[i] = signed
+	}
+
+	body := &ethpb.BeaconBlockBodyCapella{
+		BlsToExecutionChanges: signedChanges,
+	}
+	bpb := &ethpb.BeaconBlockCapella{
+		Body: body,
+	}
+	sbpb := &ethpb.SignedBeaconBlockCapella{
+		Block: bpb,
+	}
+	signed, err := consensusblocks.NewSignedBeaconBlock(sbpb)
+	require.NoError(t, err)
+	st, err = blocks.ProcessBLSToExecutionChanges(st, signed)
+	require.NoError(t, err)
+	vals := st.Validators()
+	for _, val := range vals {
+		require.DeepEqual(t, executionAddress, val.WithdrawalCredentials[12:])
+		require.Equal(t, params.BeaconConfig().ETH1AddressWithdrawalPrefixByte, val.WithdrawalCredentials[0])
+	}
+}
+
+func TestBLSChangesSignatureBatch(t *testing.T) {
+	spb := &ethpb.BeaconStateCapella{
+		Fork: &ethpb.Fork{
+			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+		},
+	}
+	numValidators := 10
+	validators := make([]*ethpb.Validator, numValidators)
+	blsChanges := make([]*ethpb.BLSToExecutionChange, numValidators)
+	spb.Balances = make([]uint64, numValidators)
+	privKeys := make([]common.SecretKey, numValidators)
+	maxEffectiveBalance := params.BeaconConfig().MaxEffectiveBalance
+	executionAddress := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13}
+
+	for i := range validators {
+		v := &ethpb.Validator{}
+		v.EffectiveBalance = maxEffectiveBalance
+		v.WithdrawableEpoch = params.BeaconConfig().FarFutureEpoch
+		v.WithdrawalCredentials = make([]byte, 32)
+		priv, err := bls.RandKey()
+		require.NoError(t, err)
+		privKeys[i] = priv
+		pubkey := priv.PublicKey().Marshal()
+
+		message := &ethpb.BLSToExecutionChange{
+			ToExecutionAddress: executionAddress,
+			ValidatorIndex:     types.ValidatorIndex(i),
+			FromBlsPubkey:      pubkey,
+		}
+
+		hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+		digest := hashFn.Hash(pubkey)
+		digest[0] = params.BeaconConfig().BLSWithdrawalPrefixByte
+		copy(v.WithdrawalCredentials, digest[:])
+		validators[i] = v
+		blsChanges[i] = message
+	}
+	spb.Validators = validators
+	st, err := state_native.InitializeFromProtoCapella(spb)
+	require.NoError(t, err)
+
+	signedChanges := make([]*ethpb.SignedBLSToExecutionChange, numValidators)
+	for i, message := range blsChanges {
+		signature, err := signing.ComputeDomainAndSign(st, time.CurrentEpoch(st), message, params.BeaconConfig().DomainBLSToExecutionChange, privKeys[i])
+		require.NoError(t, err)
+
+		signed := &ethpb.SignedBLSToExecutionChange{
+			Message:   message,
+			Signature: signature,
+		}
+		signedChanges[i] = signed
+	}
+	batch, err := blocks.BLSChangesSignatureBatch(st, signedChanges)
+	require.NoError(t, err)
+	verify, err := batch.Verify()
+	require.NoError(t, err)
+	require.Equal(t, true, verify)
+
+	// Verify a single change
+	change := migration.V1Alpha1SignedBLSToExecChangeToV2(signedChanges[0])
+	require.NoError(t, blocks.VerifyBLSChangeSignature(st, change))
+}
+
+func TestBLSChangesSignatureBatchWrongFork(t *testing.T) {
+	spb := &ethpb.BeaconStateCapella{
+		Fork: &ethpb.Fork{
+			CurrentVersion:  params.BeaconConfig().CapellaForkVersion,
+			PreviousVersion: params.BeaconConfig().BellatrixForkVersion,
+			Epoch:           params.BeaconConfig().CapellaForkEpoch,
+		},
+	}
+	numValidators := 10
+	validators := make([]*ethpb.Validator, numValidators)
+	blsChanges := make([]*ethpb.BLSToExecutionChange, numValidators)
+	spb.Balances = make([]uint64, numValidators)
+	privKeys := make([]common.SecretKey, numValidators)
+	maxEffectiveBalance := params.BeaconConfig().MaxEffectiveBalance
+	executionAddress := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13}
+
+	for i := range validators {
+		v := &ethpb.Validator{}
+		v.EffectiveBalance = maxEffectiveBalance
+		v.WithdrawableEpoch = params.BeaconConfig().FarFutureEpoch
+		v.WithdrawalCredentials = make([]byte, 32)
+		priv, err := bls.RandKey()
+		require.NoError(t, err)
+		privKeys[i] = priv
+		pubkey := priv.PublicKey().Marshal()
+
+		message := &ethpb.BLSToExecutionChange{
+			ToExecutionAddress: executionAddress,
+			ValidatorIndex:     types.ValidatorIndex(i),
+			FromBlsPubkey:      pubkey,
+		}
+
+		hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+		digest := hashFn.Hash(pubkey)
+		digest[0] = params.BeaconConfig().BLSWithdrawalPrefixByte
+		copy(v.WithdrawalCredentials, digest[:])
+		validators[i] = v
+		blsChanges[i] = message
+	}
+	spb.Validators = validators
+	st, err := state_native.InitializeFromProtoCapella(spb)
+	require.NoError(t, err)
+
+	signedChanges := make([]*ethpb.SignedBLSToExecutionChange, numValidators)
+	for i, message := range blsChanges {
+		signature, err := signing.ComputeDomainAndSign(st, time.CurrentEpoch(st), message, params.BeaconConfig().DomainBLSToExecutionChange, privKeys[i])
+		require.NoError(t, err)
+
+		signed := &ethpb.SignedBLSToExecutionChange{
+			Message:   message,
+			Signature: signature,
+		}
+		signedChanges[i] = signed
+	}
+	batch, err := blocks.BLSChangesSignatureBatch(st, signedChanges)
+	require.NoError(t, err)
+	verify, err := batch.Verify()
+	require.NoError(t, err)
+	require.Equal(t, false, verify)
+
+	// Verify a single change
+	change := migration.V1Alpha1SignedBLSToExecChangeToV2(signedChanges[0])
+	require.ErrorIs(t, signing.ErrSigFailedToVerify, blocks.VerifyBLSChangeSignature(st, change))
+}
+
+func TestBLSChangesSignatureBatchFromBellatrix(t *testing.T) {
+	cfg := params.BeaconConfig()
+	savedConfig := cfg.Copy()
+	cfg.CapellaForkEpoch = cfg.BellatrixForkEpoch.AddEpoch(2)
+	params.OverrideBeaconConfig(cfg)
+
+	spb := &ethpb.BeaconStateBellatrix{
+		Fork: &ethpb.Fork{
+			CurrentVersion:  params.BeaconConfig().BellatrixForkVersion,
+			PreviousVersion: params.BeaconConfig().AltairForkVersion,
+			Epoch:           params.BeaconConfig().BellatrixForkEpoch,
+		},
+	}
+	numValidators := 10
+	validators := make([]*ethpb.Validator, numValidators)
+	blsChanges := make([]*ethpb.BLSToExecutionChange, numValidators)
+	spb.Balances = make([]uint64, numValidators)
+	slot, err := slots.EpochStart(params.BeaconConfig().BellatrixForkEpoch)
+	require.NoError(t, err)
+	spb.Slot = slot
+
+	privKeys := make([]common.SecretKey, numValidators)
+	maxEffectiveBalance := params.BeaconConfig().MaxEffectiveBalance
+	executionAddress := []byte{0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13}
+
+	for i := range validators {
+		v := &ethpb.Validator{}
+		v.EffectiveBalance = maxEffectiveBalance
+		v.WithdrawableEpoch = params.BeaconConfig().FarFutureEpoch
+		v.WithdrawalCredentials = make([]byte, 32)
+		priv, err := bls.RandKey()
+		require.NoError(t, err)
+		privKeys[i] = priv
+		pubkey := priv.PublicKey().Marshal()
+
+		message := &ethpb.BLSToExecutionChange{
+			ToExecutionAddress: executionAddress,
+			ValidatorIndex:     types.ValidatorIndex(i),
+			FromBlsPubkey:      pubkey,
+		}
+
+		hashFn := ssz.NewHasherFunc(hash.CustomSHA256Hasher())
+		digest := hashFn.Hash(pubkey)
+		digest[0] = params.BeaconConfig().BLSWithdrawalPrefixByte
+		copy(v.WithdrawalCredentials, digest[:])
+		validators[i] = v
+		blsChanges[i] = message
+	}
+	spb.Validators = validators
+	st, err := state_native.InitializeFromProtoBellatrix(spb)
+	require.NoError(t, err)
+
+	signedChanges := make([]*ethpb.SignedBLSToExecutionChange, numValidators)
+	spc := &ethpb.BeaconStateCapella{
+		Fork: &ethpb.Fork{
+			CurrentVersion:  params.BeaconConfig().CapellaForkVersion,
+			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+			Epoch:           params.BeaconConfig().CapellaForkEpoch,
+		},
+	}
+	slot, err = slots.EpochStart(params.BeaconConfig().CapellaForkEpoch)
+	require.NoError(t, err)
+	spc.Slot = slot
+
+	stc, err := state_native.InitializeFromProtoCapella(spc)
+	require.NoError(t, err)
+
+	for i, message := range blsChanges {
+		signature, err := signing.ComputeDomainAndSign(stc, 0, message, params.BeaconConfig().DomainBLSToExecutionChange, privKeys[i])
+		require.NoError(t, err)
+
+		signed := &ethpb.SignedBLSToExecutionChange{
+			Message:   message,
+			Signature: signature,
+		}
+		signedChanges[i] = signed
+	}
+	batch, err := blocks.BLSChangesSignatureBatch(st, signedChanges)
+	require.NoError(t, err)
+	verify, err := batch.Verify()
+	require.NoError(t, err)
+	require.Equal(t, true, verify)
+
+	// Verify a single change
+	change := migration.V1Alpha1SignedBLSToExecChangeToV2(signedChanges[0])
+	require.NoError(t, blocks.VerifyBLSChangeSignature(st, change))
+	params.OverrideBeaconConfig(savedConfig)
+}
--- a/beacon-chain/core/capella/BUILD.bazel
+++ b/beacon-chain/core/capella/BUILD.bazel
@@ -0,0 +1,31 @@
+load("@prysm//tools/go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = ["upgrade.go"],
+    importpath = "github.com/prysmaticlabs/prysm/v3/beacon-chain/core/capella",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//beacon-chain/core/time:go_default_library",
+        "//beacon-chain/state:go_default_library",
+        "//beacon-chain/state/state-native:go_default_library",
+        "//config/params:go_default_library",
+        "//proto/engine/v1:go_default_library",
+        "//proto/prysm/v1alpha1:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["upgrade_test.go"],
+    deps = [
+        ":go_default_library",
+        "//beacon-chain/core/time:go_default_library",
+        "//config/params:go_default_library",
+        "//consensus-types/primitives:go_default_library",
+        "//proto/engine/v1:go_default_library",
+        "//proto/prysm/v1alpha1:go_default_library",
+        "//testing/require:go_default_library",
+        "//testing/util:go_default_library",
+    ],
+)
--- a/beacon-chain/core/capella/upgrade.go
+++ b/beacon-chain/core/capella/upgrade.go
@@ -0,0 +1,205 @@
+package capella
+
+import (
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/time"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
+	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
+	"github.com/prysmaticlabs/prysm/v3/config/params"
+	enginev1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
+	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
+)
+
+// UpgradeToDeneb updates inputs a generic state to return the version Deneb state.
+func UpgradeToDeneb(state state.BeaconState) (state.BeaconState, error) {
+	epoch := time.CurrentEpoch(state)
+
+	currentSyncCommittee, err := state.CurrentSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	nextSyncCommittee, err := state.NextSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	prevEpochParticipation, err := state.PreviousEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	currentEpochParticipation, err := state.CurrentEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	inactivityScores, err := state.InactivityScores()
+	if err != nil {
+		return nil, err
+	}
+	payloadHeader, err := state.LatestExecutionPayloadHeader()
+	if err != nil {
+		return nil, err
+	}
+	txRoot, err := payloadHeader.TransactionsRoot()
+	if err != nil {
+		return nil, err
+	}
+	wdRoot, err := payloadHeader.WithdrawalsRoot()
+	if err != nil {
+		return nil, err
+	}
+	wi, err := state.NextWithdrawalIndex()
+	if err != nil {
+		return nil, err
+	}
+	vi, err := state.NextWithdrawalValidatorIndex()
+	if err != nil {
+		return nil, err
+	}
+	summarires, err := state.HistoricalSummaries()
+	if err != nil {
+		return nil, err
+	}
+
+	s := &ethpb.BeaconStateDeneb{
+		GenesisTime:           state.GenesisTime(),
+		GenesisValidatorsRoot: state.GenesisValidatorsRoot(),
+		Slot:                  state.Slot(),
+		Fork: &ethpb.Fork{
+			PreviousVersion: state.Fork().CurrentVersion,
+			CurrentVersion:  params.BeaconConfig().DenebForkVersion,
+			Epoch:           epoch,
+		},
+		LatestBlockHeader:           state.LatestBlockHeader(),
+		BlockRoots:                  state.BlockRoots(),
+		StateRoots:                  state.StateRoots(),
+		HistoricalRoots:             [][]byte{},
+		Eth1Data:                    state.Eth1Data(),
+		Eth1DataVotes:               state.Eth1DataVotes(),
+		Eth1DepositIndex:            state.Eth1DepositIndex(),
+		Validators:                  state.Validators(),
+		Balances:                    state.Balances(),
+		RandaoMixes:                 state.RandaoMixes(),
+		Slashings:                   state.Slashings(),
+		PreviousEpochParticipation:  prevEpochParticipation,
+		CurrentEpochParticipation:   currentEpochParticipation,
+		JustificationBits:           state.JustificationBits(),
+		PreviousJustifiedCheckpoint: state.PreviousJustifiedCheckpoint(),
+		CurrentJustifiedCheckpoint:  state.CurrentJustifiedCheckpoint(),
+		FinalizedCheckpoint:         state.FinalizedCheckpoint(),
+		InactivityScores:            inactivityScores,
+		CurrentSyncCommittee:        currentSyncCommittee,
+		NextSyncCommittee:           nextSyncCommittee,
+		LatestExecutionPayloadHeader: &enginev1.ExecutionPayloadHeaderDeneb{
+			ParentHash:       payloadHeader.ParentHash(),
+			FeeRecipient:     payloadHeader.FeeRecipient(),
+			StateRoot:        payloadHeader.StateRoot(),
+			ReceiptsRoot:     payloadHeader.ReceiptsRoot(),
+			LogsBloom:        payloadHeader.LogsBloom(),
+			PrevRandao:       payloadHeader.PrevRandao(),
+			BlockNumber:      payloadHeader.BlockNumber(),
+			GasLimit:         payloadHeader.GasLimit(),
+			GasUsed:          payloadHeader.GasUsed(),
+			Timestamp:        payloadHeader.Timestamp(),
+			ExtraData:        payloadHeader.ExtraData(),
+			BaseFeePerGas:    payloadHeader.BaseFeePerGas(),
+			BlockHash:        payloadHeader.BlockHash(),
+			ExcessDataGas:    make([]byte, 32),
+			TransactionsRoot: txRoot,
+			WithdrawalsRoot:  wdRoot,
+		},
+		NextWithdrawalIndex:          wi,
+		NextWithdrawalValidatorIndex: vi,
+		HistoricalSummaries:          summarires,
+	}
+
+	return state_native.InitializeFromProtoUnsafeDeneb(s)
+}
+
+// UpgradeToCapella updates a generic state to return the version Capella state.
+func UpgradeToCapella(state state.BeaconState) (state.BeaconState, error) {
+	epoch := time.CurrentEpoch(state)
+
+	currentSyncCommittee, err := state.CurrentSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	nextSyncCommittee, err := state.NextSyncCommittee()
+	if err != nil {
+		return nil, err
+	}
+	prevEpochParticipation, err := state.PreviousEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	currentEpochParticipation, err := state.CurrentEpochParticipation()
+	if err != nil {
+		return nil, err
+	}
+	inactivityScores, err := state.InactivityScores()
+	if err != nil {
+		return nil, err
+	}
+	payloadHeader, err := state.LatestExecutionPayloadHeader()
+	if err != nil {
+		return nil, err
+	}
+	txRoot, err := payloadHeader.TransactionsRoot()
+	if err != nil {
+		return nil, err
+	}
+
+	hrs, err := state.HistoricalRoots()
+	if err != nil {
+		return nil, err
+	}
+	s := &ethpb.BeaconStateCapella{
+		GenesisTime:           state.GenesisTime(),
+		GenesisValidatorsRoot: state.GenesisValidatorsRoot(),
+		Slot:                  state.Slot(),
+		Fork: &ethpb.Fork{
+			PreviousVersion: state.Fork().CurrentVersion,
+			CurrentVersion:  params.BeaconConfig().CapellaForkVersion,
+			Epoch:           epoch,
+		},
+		LatestBlockHeader:           state.LatestBlockHeader(),
+		BlockRoots:                  state.BlockRoots(),
+		StateRoots:                  state.StateRoots(),
+		HistoricalRoots:             hrs,
+		Eth1Data:                    state.Eth1Data(),
+		Eth1DataVotes:               state.Eth1DataVotes(),
+		Eth1DepositIndex:            state.Eth1DepositIndex(),
+		Validators:                  state.Validators(),
+		Balances:                    state.Balances(),
+		RandaoMixes:                 state.RandaoMixes(),
+		Slashings:                   state.Slashings(),
+		PreviousEpochParticipation:  prevEpochParticipation,
+		CurrentEpochParticipation:   currentEpochParticipation,
+		JustificationBits:           state.JustificationBits(),
+		PreviousJustifiedCheckpoint: state.PreviousJustifiedCheckpoint(),
+		CurrentJustifiedCheckpoint:  state.CurrentJustifiedCheckpoint(),
+		FinalizedCheckpoint:         state.FinalizedCheckpoint(),
+		InactivityScores:            inactivityScores,
+		CurrentSyncCommittee:        currentSyncCommittee,
+		NextSyncCommittee:           nextSyncCommittee,
+		LatestExecutionPayloadHeader: &enginev1.ExecutionPayloadHeaderCapella{
+			ParentHash:       payloadHeader.ParentHash(),
+			FeeRecipient:     payloadHeader.FeeRecipient(),
+			StateRoot:        payloadHeader.StateRoot(),
+			ReceiptsRoot:     payloadHeader.ReceiptsRoot(),
+			LogsBloom:        payloadHeader.LogsBloom(),
+			PrevRandao:       payloadHeader.PrevRandao(),
+			BlockNumber:      payloadHeader.BlockNumber(),
+			GasLimit:         payloadHeader.GasLimit(),
+			GasUsed:          payloadHeader.GasUsed(),
+			Timestamp:        payloadHeader.Timestamp(),
+			ExtraData:        payloadHeader.ExtraData(),
+			BaseFeePerGas:    payloadHeader.BaseFeePerGas(),
+			BlockHash:        payloadHeader.BlockHash(),
+			TransactionsRoot: txRoot,
+			WithdrawalsRoot:  make([]byte, 32),
+		},
+		NextWithdrawalIndex:          0,
+		NextWithdrawalValidatorIndex: 0,
+		HistoricalSummaries:          make([]*ethpb.HistoricalSummary, 0),
+	}
+
+	return state_native.InitializeFromProtoUnsafeCapella(s)
+}
--- a/beacon-chain/core/capella/upgrade_test.go
+++ b/beacon-chain/core/capella/upgrade_test.go
@@ -0,0 +1,104 @@
+package capella_test
+
+import (
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/capella"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/time"
+	"github.com/prysmaticlabs/prysm/v3/config/params"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	enginev1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
+	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v3/testing/require"
+	"github.com/prysmaticlabs/prysm/v3/testing/util"
+)
+
+func TestUpgradeToCapella(t *testing.T) {
+	st, _ := util.DeterministicGenesisStateBellatrix(t, params.BeaconConfig().MaxValidatorsPerCommittee)
+	preForkState := st.Copy()
+	mSt, err := capella.UpgradeToCapella(st)
+	require.NoError(t, err)
+
+	require.Equal(t, preForkState.GenesisTime(), mSt.GenesisTime())
+	require.DeepSSZEqual(t, preForkState.GenesisValidatorsRoot(), mSt.GenesisValidatorsRoot())
+	require.Equal(t, preForkState.Slot(), mSt.Slot())
+	require.DeepSSZEqual(t, preForkState.LatestBlockHeader(), mSt.LatestBlockHeader())
+	require.DeepSSZEqual(t, preForkState.BlockRoots(), mSt.BlockRoots())
+	require.DeepSSZEqual(t, preForkState.StateRoots(), mSt.StateRoots())
+	require.DeepSSZEqual(t, preForkState.Eth1Data(), mSt.Eth1Data())
+	require.DeepSSZEqual(t, preForkState.Eth1DataVotes(), mSt.Eth1DataVotes())
+	require.DeepSSZEqual(t, preForkState.Eth1DepositIndex(), mSt.Eth1DepositIndex())
+	require.DeepSSZEqual(t, preForkState.Validators(), mSt.Validators())
+	require.DeepSSZEqual(t, preForkState.Balances(), mSt.Balances())
+	require.DeepSSZEqual(t, preForkState.RandaoMixes(), mSt.RandaoMixes())
+	require.DeepSSZEqual(t, preForkState.Slashings(), mSt.Slashings())
+	require.DeepSSZEqual(t, preForkState.JustificationBits(), mSt.JustificationBits())
+	require.DeepSSZEqual(t, preForkState.PreviousJustifiedCheckpoint(), mSt.PreviousJustifiedCheckpoint())
+	require.DeepSSZEqual(t, preForkState.CurrentJustifiedCheckpoint(), mSt.CurrentJustifiedCheckpoint())
+	require.DeepSSZEqual(t, preForkState.FinalizedCheckpoint(), mSt.FinalizedCheckpoint())
+	numValidators := mSt.NumValidators()
+	p, err := mSt.PreviousEpochParticipation()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, make([]byte, numValidators), p)
+	p, err = mSt.CurrentEpochParticipation()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, make([]byte, numValidators), p)
+	s, err := mSt.InactivityScores()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, make([]uint64, numValidators), s)
+
+	f := mSt.Fork()
+	require.DeepSSZEqual(t, &ethpb.Fork{
+		PreviousVersion: st.Fork().CurrentVersion,
+		CurrentVersion:  params.BeaconConfig().CapellaForkVersion,
+		Epoch:           time.CurrentEpoch(st),
+	}, f)
+	csc, err := mSt.CurrentSyncCommittee()
+	require.NoError(t, err)
+	psc, err := preForkState.CurrentSyncCommittee()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, psc, csc)
+	nsc, err := mSt.NextSyncCommittee()
+	require.NoError(t, err)
+	psc, err = preForkState.NextSyncCommittee()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, psc, nsc)
+
+	header, err := mSt.LatestExecutionPayloadHeader()
+	require.NoError(t, err)
+	protoHeader, ok := header.Proto().(*enginev1.ExecutionPayloadHeaderCapella)
+	require.Equal(t, true, ok)
+	prevHeader, err := preForkState.LatestExecutionPayloadHeader()
+	require.NoError(t, err)
+	txRoot, err := prevHeader.TransactionsRoot()
+	require.NoError(t, err)
+
+	wanted := &enginev1.ExecutionPayloadHeaderCapella{
+		ParentHash:       prevHeader.ParentHash(),
+		FeeRecipient:     prevHeader.FeeRecipient(),
+		StateRoot:        prevHeader.StateRoot(),
+		ReceiptsRoot:     prevHeader.ReceiptsRoot(),
+		LogsBloom:        prevHeader.LogsBloom(),
+		PrevRandao:       prevHeader.PrevRandao(),
+		BlockNumber:      prevHeader.BlockNumber(),
+		GasLimit:         prevHeader.GasLimit(),
+		GasUsed:          prevHeader.GasUsed(),
+		Timestamp:        prevHeader.Timestamp(),
+		BaseFeePerGas:    prevHeader.BaseFeePerGas(),
+		BlockHash:        prevHeader.BlockHash(),
+		TransactionsRoot: txRoot,
+		WithdrawalsRoot:  make([]byte, 32),
+	}
+	require.DeepEqual(t, wanted, protoHeader)
+	nwi, err := mSt.NextWithdrawalIndex()
+	require.NoError(t, err)
+	require.Equal(t, uint64(0), nwi)
+
+	lwvi, err := mSt.NextWithdrawalValidatorIndex()
+	require.NoError(t, err)
+	require.Equal(t, types.ValidatorIndex(0), lwvi)
+
+	summaries, err := mSt.HistoricalSummaries()
+	require.NoError(t, err)
+	require.Equal(t, 0, len(summaries))
+}
--- a/beacon-chain/core/epoch/BUILD.bazel
+++ b/beacon-chain/core/epoch/BUILD.bazel
@@ -13,11 +13,14 @@ go_library(
        "//beacon-chain/core/time:go_default_library",
        "//beacon-chain/core/validators:go_default_library",
        "//beacon-chain/state:go_default_library",
+        "//beacon-chain/state/stateutil:go_default_library",
+        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//math:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//proto/prysm/v1alpha1/attestation:go_default_library",
+        "//runtime/version:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
    ],
 )
@@ -33,8 +36,10 @@ go_test(
    deps = [
        "//beacon-chain/core/helpers:go_default_library",
        "//beacon-chain/core/time:go_default_library",
+        "//beacon-chain/core/transition:go_default_library",
        "//beacon-chain/state:go_default_library",
        "//beacon-chain/state/state-native:go_default_library",
+        "//beacon-chain/state/stateutil:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
--- a/beacon-chain/core/epoch/epoch_processing.go
+++ b/beacon-chain/core/epoch/epoch_processing.go
@@ -14,11 +14,14 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/validators"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stateutil"
+	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/math"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1/attestation"
+	"github.com/prysmaticlabs/prysm/v3/runtime/version"
 )

 // sortableIndices implements the Sort interface to sort newly activated validator indices
@@ -49,12 +52,13 @@ func (s sortableIndices) Less(i, j int) bool {
 // need to get attesting balance from attestations.
 //
 // Spec pseudocode definition:
-//  def get_attesting_balance(state: BeaconState, attestations: Sequence[PendingAttestation]) -> Gwei:
-//    """
-//    Return the combined effective balance of the set of unslashed validators participating in ``attestations``.
-//    Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
-//    """
-//    return get_total_balance(state, get_unslashed_attesting_indices(state, attestations))
+//
+//	def get_attesting_balance(state: BeaconState, attestations: Sequence[PendingAttestation]) -> Gwei:
+//	  """
+//	  Return the combined effective balance of the set of unslashed validators participating in ``attestations``.
+//	  Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
+//	  """
+//	  return get_total_balance(state, get_unslashed_attesting_indices(state, attestations))
 func AttestingBalance(ctx context.Context, state state.ReadOnlyBeaconState, atts []*ethpb.PendingAttestation) (uint64, error) {
 	indices, err := UnslashedAttestingIndices(ctx, state, atts)
 	if err != nil {
@@ -67,25 +71,26 @@ func AttestingBalance(ctx context.Context, state state.ReadOnlyBeaconState, atts
 // the amount to rotate is determined churn limit.
 //
 // Spec pseudocode definition:
-//   def process_registry_updates(state: BeaconState) -> None:
-//    # Process activation eligibility and ejections
-//    for index, validator in enumerate(state.validators):
-//        if is_eligible_for_activation_queue(validator):
-//            validator.activation_eligibility_epoch = get_current_epoch(state) + 1
 //
-//        if is_active_validator(validator, get_current_epoch(state)) and validator.effective_balance <= EJECTION_BALANCE:
-//            initiate_validator_exit(state, ValidatorIndex(index))
+//	def process_registry_updates(state: BeaconState) -> None:
+//	 # Process activation eligibility and ejections
+//	 for index, validator in enumerate(state.validators):
+//	     if is_eligible_for_activation_queue(validator):
+//	         validator.activation_eligibility_epoch = get_current_epoch(state) + 1
 //
-//    # Queue validators eligible for activation and not yet dequeued for activation
-//    activation_queue = sorted([
-//        index for index, validator in enumerate(state.validators)
-//        if is_eligible_for_activation(state, validator)
-//        # Order by the sequence of activation_eligibility_epoch setting and then index
-//    ], key=lambda index: (state.validators[index].activation_eligibility_epoch, index))
-//    # Dequeued validators for activation up to churn limit
-//    for index in activation_queue[:get_validator_churn_limit(state)]:
-//        validator = state.validators[index]
-//        validator.activation_epoch = compute_activation_exit_epoch(get_current_epoch(state))
+//	     if is_active_validator(validator, get_current_epoch(state)) and validator.effective_balance <= EJECTION_BALANCE:
+//	         initiate_validator_exit(state, ValidatorIndex(index))
+//
+//	 # Queue validators eligible for activation and not yet dequeued for activation
+//	 activation_queue = sorted([
+//	     index for index, validator in enumerate(state.validators)
+//	     if is_eligible_for_activation(state, validator)
+//	     # Order by the sequence of activation_eligibility_epoch setting and then index
+//	 ], key=lambda index: (state.validators[index].activation_eligibility_epoch, index))
+//	 # Dequeued validators for activation up to churn limit
+//	 for index in activation_queue[:get_validator_churn_limit(state)]:
+//	     validator = state.validators[index]
+//	     validator.activation_epoch = compute_activation_exit_epoch(get_current_epoch(state))
 func ProcessRegistryUpdates(ctx context.Context, state state.BeaconState) (state.BeaconState, error) {
 	currentEpoch := time.CurrentEpoch(state)
 	vals := state.Validators()
@@ -155,16 +160,16 @@ func ProcessRegistryUpdates(ctx context.Context, state state.BeaconState) (state

 // ProcessSlashings processes the slashed validators during epoch processing,
 //
-//  def process_slashings(state: BeaconState) -> None:
-//    epoch = get_current_epoch(state)
-//    total_balance = get_total_active_balance(state)
-//    adjusted_total_slashing_balance = min(sum(state.slashings) * PROPORTIONAL_SLASHING_MULTIPLIER, total_balance)
-//    for index, validator in enumerate(state.validators):
-//        if validator.slashed and epoch + EPOCHS_PER_SLASHINGS_VECTOR // 2 == validator.withdrawable_epoch:
-//            increment = EFFECTIVE_BALANCE_INCREMENT  # Factored out from penalty numerator to avoid uint64 overflow
-//            penalty_numerator = validator.effective_balance // increment * adjusted_total_slashing_balance
-//            penalty = penalty_numerator // total_balance * increment
-//            decrease_balance(state, ValidatorIndex(index), penalty)
+//	def process_slashings(state: BeaconState) -> None:
+//	  epoch = get_current_epoch(state)
+//	  total_balance = get_total_active_balance(state)
+//	  adjusted_total_slashing_balance = min(sum(state.slashings) * PROPORTIONAL_SLASHING_MULTIPLIER, total_balance)
+//	  for index, validator in enumerate(state.validators):
+//	      if validator.slashed and epoch + EPOCHS_PER_SLASHINGS_VECTOR // 2 == validator.withdrawable_epoch:
+//	          increment = EFFECTIVE_BALANCE_INCREMENT  # Factored out from penalty numerator to avoid uint64 overflow
+//	          penalty_numerator = validator.effective_balance // increment * adjusted_total_slashing_balance
+//	          penalty = penalty_numerator // total_balance * increment
+//	          decrease_balance(state, ValidatorIndex(index), penalty)
 func ProcessSlashings(state state.BeaconState, slashingMultiplier uint64) (state.BeaconState, error) {
 	currentEpoch := time.CurrentEpoch(state)
 	totalBalance, err := helpers.TotalActiveBalance(state)
@@ -207,11 +212,12 @@ func ProcessSlashings(state state.BeaconState, slashingMultiplier uint64) (state
 // ProcessEth1DataReset processes updates to ETH1 data votes during epoch processing.
 //
 // Spec pseudocode definition:
-//  def process_eth1_data_reset(state: BeaconState) -> None:
-//    next_epoch = Epoch(get_current_epoch(state) + 1)
-//    # Reset eth1 data votes
-//    if next_epoch % EPOCHS_PER_ETH1_VOTING_PERIOD == 0:
-//        state.eth1_data_votes = []
+//
+//	def process_eth1_data_reset(state: BeaconState) -> None:
+//	  next_epoch = Epoch(get_current_epoch(state) + 1)
+//	  # Reset eth1 data votes
+//	  if next_epoch % EPOCHS_PER_ETH1_VOTING_PERIOD == 0:
+//	      state.eth1_data_votes = []
 func ProcessEth1DataReset(state state.BeaconState) (state.BeaconState, error) {
 	currentEpoch := time.CurrentEpoch(state)
 	nextEpoch := currentEpoch + 1
@@ -229,18 +235,19 @@ func ProcessEth1DataReset(state state.BeaconState) (state.BeaconState, error) {
 // ProcessEffectiveBalanceUpdates processes effective balance updates during epoch processing.
 //
 // Spec pseudocode definition:
-//  def process_effective_balance_updates(state: BeaconState) -> None:
-//    # Update effective balances with hysteresis
-//    for index, validator in enumerate(state.validators):
-//        balance = state.balances[index]
-//        HYSTERESIS_INCREMENT = uint64(EFFECTIVE_BALANCE_INCREMENT // HYSTERESIS_QUOTIENT)
-//        DOWNWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_DOWNWARD_MULTIPLIER
-//        UPWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_UPWARD_MULTIPLIER
-//        if (
-//            balance + DOWNWARD_THRESHOLD < validator.effective_balance
-//            or validator.effective_balance + UPWARD_THRESHOLD < balance
-//        ):
-//            validator.effective_balance = min(balance - balance % EFFECTIVE_BALANCE_INCREMENT, MAX_EFFECTIVE_BALANCE)
+//
+//	def process_effective_balance_updates(state: BeaconState) -> None:
+//	  # Update effective balances with hysteresis
+//	  for index, validator in enumerate(state.validators):
+//	      balance = state.balances[index]
+//	      HYSTERESIS_INCREMENT = uint64(EFFECTIVE_BALANCE_INCREMENT // HYSTERESIS_QUOTIENT)
+//	      DOWNWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_DOWNWARD_MULTIPLIER
+//	      UPWARD_THRESHOLD = HYSTERESIS_INCREMENT * HYSTERESIS_UPWARD_MULTIPLIER
+//	      if (
+//	          balance + DOWNWARD_THRESHOLD < validator.effective_balance
+//	          or validator.effective_balance + UPWARD_THRESHOLD < balance
+//	      ):
+//	          validator.effective_balance = min(balance - balance % EFFECTIVE_BALANCE_INCREMENT, MAX_EFFECTIVE_BALANCE)
 func ProcessEffectiveBalanceUpdates(state state.BeaconState) (state.BeaconState, error) {
 	effBalanceInc := params.BeaconConfig().EffectiveBalanceIncrement
 	maxEffBalance := params.BeaconConfig().MaxEffectiveBalance
@@ -285,10 +292,11 @@ func ProcessEffectiveBalanceUpdates(state state.BeaconState) (state.BeaconState,
 // ProcessSlashingsReset processes the total slashing balances updates during epoch processing.
 //
 // Spec pseudocode definition:
-//  def process_slashings_reset(state: BeaconState) -> None:
-//    next_epoch = Epoch(get_current_epoch(state) + 1)
-//    # Reset slashings
-//    state.slashings[next_epoch % EPOCHS_PER_SLASHINGS_VECTOR] = Gwei(0)
+//
+//	def process_slashings_reset(state: BeaconState) -> None:
+//	  next_epoch = Epoch(get_current_epoch(state) + 1)
+//	  # Reset slashings
+//	  state.slashings[next_epoch % EPOCHS_PER_SLASHINGS_VECTOR] = Gwei(0)
 func ProcessSlashingsReset(state state.BeaconState) (state.BeaconState, error) {
 	currentEpoch := time.CurrentEpoch(state)
 	nextEpoch := currentEpoch + 1
@@ -314,11 +322,12 @@ func ProcessSlashingsReset(state state.BeaconState) (state.BeaconState, error) {
 // ProcessRandaoMixesReset processes the final updates to RANDAO mix during epoch processing.
 //
 // Spec pseudocode definition:
-//  def process_randao_mixes_reset(state: BeaconState) -> None:
-//    current_epoch = get_current_epoch(state)
-//    next_epoch = Epoch(current_epoch + 1)
-//    # Set randao mix
-//    state.randao_mixes[next_epoch % EPOCHS_PER_HISTORICAL_VECTOR] = get_randao_mix(state, current_epoch)
+//
+//	def process_randao_mixes_reset(state: BeaconState) -> None:
+//	  current_epoch = get_current_epoch(state)
+//	  next_epoch = Epoch(current_epoch + 1)
+//	  # Set randao mix
+//	  state.randao_mixes[next_epoch % EPOCHS_PER_HISTORICAL_VECTOR] = get_randao_mix(state, current_epoch)
 func ProcessRandaoMixesReset(state state.BeaconState) (state.BeaconState, error) {
 	currentEpoch := time.CurrentEpoch(state)
 	nextEpoch := currentEpoch + 1
@@ -343,32 +352,39 @@ func ProcessRandaoMixesReset(state state.BeaconState) (state.BeaconState, error)
 	return state, nil
 }

-// ProcessHistoricalRootsUpdate processes the updates to historical root accumulator during epoch processing.
-//
-// Spec pseudocode definition:
-//  def process_historical_roots_update(state: BeaconState) -> None:
-//    # Set historical root accumulator
-//    next_epoch = Epoch(get_current_epoch(state) + 1)
-//    if next_epoch % (SLOTS_PER_HISTORICAL_ROOT // SLOTS_PER_EPOCH) == 0:
-//        historical_batch = HistoricalBatch(block_roots=state.block_roots, state_roots=state.state_roots)
-//        state.historical_roots.append(hash_tree_root(historical_batch))
-func ProcessHistoricalRootsUpdate(state state.BeaconState) (state.BeaconState, error) {
+// ProcessHistoricalDataUpdate processes the updates to historical data during epoch processing.
+// From Capella onward, per spec, state's historical summaries are updated instead of historical roots.
+func ProcessHistoricalDataUpdate(state state.BeaconState) (state.BeaconState, error) {
 	currentEpoch := time.CurrentEpoch(state)
 	nextEpoch := currentEpoch + 1

 	// Set historical root accumulator.
 	epochsPerHistoricalRoot := params.BeaconConfig().SlotsPerHistoricalRoot.DivSlot(params.BeaconConfig().SlotsPerEpoch)
 	if nextEpoch.Mod(uint64(epochsPerHistoricalRoot)) == 0 {
-		historicalBatch := &ethpb.HistoricalBatch{
-			BlockRoots: state.BlockRoots(),
-			StateRoots: state.StateRoots(),
-		}
-		batchRoot, err := historicalBatch.HashTreeRoot()
-		if err != nil {
-			return nil, errors.Wrap(err, "could not hash historical batch")
-		}
-		if err := state.AppendHistoricalRoots(batchRoot); err != nil {
-			return nil, err
+		if state.Version() >= version.Capella {
+			br, err := stateutil.ArraysRoot(state.BlockRoots(), fieldparams.BlockRootsLength)
+			if err != nil {
+				return nil, err
+			}
+			sr, err := stateutil.ArraysRoot(state.StateRoots(), fieldparams.StateRootsLength)
+			if err != nil {
+				return nil, err
+			}
+			if err := state.AppendHistoricalSummaries(&ethpb.HistoricalSummary{BlockSummaryRoot: br[:], StateSummaryRoot: sr[:]}); err != nil {
+				return nil, err
+			}
+		} else {
+			historicalBatch := &ethpb.HistoricalBatch{
+				BlockRoots: state.BlockRoots(),
+				StateRoots: state.StateRoots(),
+			}
+			batchRoot, err := historicalBatch.HashTreeRoot()
+			if err != nil {
+				return nil, errors.Wrap(err, "could not hash historical batch")
+			}
+			if err := state.AppendHistoricalRoots(batchRoot); err != nil {
+				return nil, err
+			}
 		}
 	}

@@ -378,10 +394,11 @@ func ProcessHistoricalRootsUpdate(state state.BeaconState) (state.BeaconState, e
 // ProcessParticipationRecordUpdates rotates current/previous epoch attestations during epoch processing.
 //
 // Spec pseudocode definition:
-//  def process_participation_record_updates(state: BeaconState) -> None:
-//    # Rotate current/previous epoch attestations
-//    state.previous_epoch_attestations = state.current_epoch_attestations
-//    state.current_epoch_attestations = []
+//
+//	def process_participation_record_updates(state: BeaconState) -> None:
+//	  # Rotate current/previous epoch attestations
+//	  state.previous_epoch_attestations = state.current_epoch_attestations
+//	  state.current_epoch_attestations = []
 func ProcessParticipationRecordUpdates(state state.BeaconState) (state.BeaconState, error) {
 	if err := state.RotateAttestations(); err != nil {
 		return nil, err
@@ -418,7 +435,7 @@ func ProcessFinalUpdates(state state.BeaconState) (state.BeaconState, error) {
 	}

 	// Set historical root accumulator.
-	state, err = ProcessHistoricalRootsUpdate(state)
+	state, err = ProcessHistoricalDataUpdate(state)
 	if err != nil {
 		return nil, err
 	}
@@ -436,12 +453,13 @@ func ProcessFinalUpdates(state state.BeaconState) (state.BeaconState, error) {
 // it sorts the indices and filters out the slashed ones.
 //
 // Spec pseudocode definition:
-//  def get_unslashed_attesting_indices(state: BeaconState,
-//                                    attestations: Sequence[PendingAttestation]) -> Set[ValidatorIndex]:
-//    output = set()  # type: Set[ValidatorIndex]
-//    for a in attestations:
-//        output = output.union(get_attesting_indices(state, a.data, a.aggregation_bits))
-//    return set(filter(lambda index: not state.validators[index].slashed, output))
+//
+//	def get_unslashed_attesting_indices(state: BeaconState,
+//	                                  attestations: Sequence[PendingAttestation]) -> Set[ValidatorIndex]:
+//	  output = set()  # type: Set[ValidatorIndex]
+//	  for a in attestations:
+//	      output = output.union(get_attesting_indices(state, a.data, a.aggregation_bits))
+//	  return set(filter(lambda index: not state.validators[index].slashed, output))
 func UnslashedAttestingIndices(ctx context.Context, state state.ReadOnlyBeaconState, atts []*ethpb.PendingAttestation) ([]types.ValidatorIndex, error) {
 	var setIndices []types.ValidatorIndex
 	seen := make(map[uint64]bool)
--- a/beacon-chain/core/epoch/epoch_processing_test.go
+++ b/beacon-chain/core/epoch/epoch_processing_test.go
@@ -10,8 +10,10 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/epoch"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/time"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/transition"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stateutil"
 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
@@ -274,7 +276,9 @@ func TestProcessFinalUpdates_CanProcess(t *testing.T) {
 	assert.DeepNotEqual(t, params.BeaconConfig().ZeroHash[:], mix, "latest RANDAO still zero hashes")

 	// Verify historical root accumulator was appended.
-	assert.Equal(t, 1, len(newS.HistoricalRoots()), "Unexpected slashed balance")
+	roots, err := newS.HistoricalRoots()
+	require.NoError(t, err)
+	assert.Equal(t, 1, len(roots), "Unexpected slashed balance")
 	currAtt, err := newS.CurrentEpochAttestations()
 	require.NoError(t, err)
 	assert.NotNil(t, currAtt, "Nil value stored in current epoch attestations instead of empty slice")
@@ -455,3 +459,83 @@ func TestProcessSlashings_BadValue(t *testing.T) {
 	_, err = epoch.ProcessSlashings(s, params.BeaconConfig().ProportionalSlashingMultiplier)
 	require.ErrorContains(t, "addition overflows", err)
 }
+
+func TestProcessHistoricalDataUpdate(t *testing.T) {
+	tests := []struct {
+		name     string
+		st       func() state.BeaconState
+		verifier func(state.BeaconState)
+	}{
+		{
+			name: "no change",
+			st: func() state.BeaconState {
+				st, _ := util.DeterministicGenesisState(t, 1)
+				return st
+			},
+			verifier: func(st state.BeaconState) {
+				roots, err := st.HistoricalRoots()
+				require.NoError(t, err)
+				require.Equal(t, 0, len(roots))
+			},
+		},
+		{
+			name: "before capella can process and get historical root",
+			st: func() state.BeaconState {
+				st, _ := util.DeterministicGenesisState(t, 1)
+				st, err := transition.ProcessSlots(context.Background(), st, params.BeaconConfig().SlotsPerHistoricalRoot-1)
+				require.NoError(t, err)
+				return st
+			},
+			verifier: func(st state.BeaconState) {
+				roots, err := st.HistoricalRoots()
+				require.NoError(t, err)
+				require.Equal(t, 1, len(roots))
+
+				b := &ethpb.HistoricalBatch{
+					BlockRoots: st.BlockRoots(),
+					StateRoots: st.StateRoots(),
+				}
+				r, err := b.HashTreeRoot()
+				require.NoError(t, err)
+				require.DeepEqual(t, r[:], roots[0])
+
+				_, err = st.HistoricalSummaries()
+				require.ErrorContains(t, "HistoricalSummaries is not supported for phase0", err)
+			},
+		},
+		{
+			name: "after capella can process and get historical summary",
+			st: func() state.BeaconState {
+				st, _ := util.DeterministicGenesisStateCapella(t, 1)
+				st, err := transition.ProcessSlots(context.Background(), st, params.BeaconConfig().SlotsPerHistoricalRoot-1)
+				require.NoError(t, err)
+				return st
+			},
+			verifier: func(st state.BeaconState) {
+				summaries, err := st.HistoricalSummaries()
+				require.NoError(t, err)
+				require.Equal(t, 1, len(summaries))
+
+				br, err := stateutil.ArraysRoot(st.BlockRoots(), fieldparams.BlockRootsLength)
+				require.NoError(t, err)
+				sr, err := stateutil.ArraysRoot(st.StateRoots(), fieldparams.StateRootsLength)
+				require.NoError(t, err)
+				b := &ethpb.HistoricalSummary{
+					BlockSummaryRoot: br[:],
+					StateSummaryRoot: sr[:],
+				}
+				require.DeepEqual(t, b, summaries[0])
+				hrs, err := st.HistoricalRoots()
+				require.NoError(t, err)
+				require.DeepEqual(t, hrs, [][]byte{})
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := epoch.ProcessHistoricalDataUpdate(tt.st())
+			require.NoError(t, err)
+			tt.verifier(got)
+		})
+	}
+}
--- a/beacon-chain/core/epoch/precompute/attestation.go
+++ b/beacon-chain/core/epoch/precompute/attestation.go
@@ -183,7 +183,7 @@ func UpdateBalance(vp []*Validator, bBal *Balance, stateVersion int) *Balance {
 			if stateVersion == version.Phase0 && v.IsPrevEpochAttester {
 				bBal.PrevEpochAttested += v.CurrentEpochEffectiveBalance
 			}
-			if (stateVersion == version.Altair || stateVersion == version.Bellatrix) && v.IsPrevEpochSourceAttester {
+			if stateVersion >= version.Altair && v.IsPrevEpochSourceAttester {
 				bBal.PrevEpochAttested += v.CurrentEpochEffectiveBalance
 			}
 			if v.IsPrevEpochTargetAttester {
--- a/beacon-chain/core/epoch/precompute/attestation_test.go
+++ b/beacon-chain/core/epoch/precompute/attestation_test.go
@@ -70,7 +70,7 @@ func TestUpdateBalance(t *testing.T) {
 	assert.DeepEqual(t, wantedPBal, pBal, "Incorrect balance calculations")
 }

-func TestUpdateBalanceBellatrixVersion(t *testing.T) {
+func TestUpdateBalanceDifferentVersions(t *testing.T) {
 	vp := []*precompute.Validator{
 		{IsCurrentEpochAttester: true, CurrentEpochEffectiveBalance: 100 * params.BeaconConfig().EffectiveBalanceIncrement},
 		{IsCurrentEpochTargetAttester: true, IsCurrentEpochAttester: true, CurrentEpochEffectiveBalance: 100 * params.BeaconConfig().EffectiveBalanceIncrement},
@@ -92,6 +92,9 @@ func TestUpdateBalanceBellatrixVersion(t *testing.T) {
 	}
 	pBal := precompute.UpdateBalance(vp, &precompute.Balance{}, version.Bellatrix)
 	assert.DeepEqual(t, wantedPBal, pBal, "Incorrect balance calculations")
+
+	pBal = precompute.UpdateBalance(vp, &precompute.Balance{}, version.Capella)
+	assert.DeepEqual(t, wantedPBal, pBal, "Incorrect balance calculations")
 }

 func TestSameHead(t *testing.T) {
--- a/beacon-chain/core/epoch/precompute/justification_finalization.go
+++ b/beacon-chain/core/epoch/precompute/justification_finalization.go
@@ -42,17 +42,18 @@ func UnrealizedCheckpoints(st state.BeaconState) (uint64, *ethpb.Checkpoint, *et
 // Note: this is an optimized version by passing in precomputed total and attesting balances.
 //
 // Spec pseudocode definition:
-//  def process_justification_and_finalization(state: BeaconState) -> None:
-//    # Initial FFG checkpoint values have a `0x00` stub for `root`.
-//    # Skip FFG updates in the first two epochs to avoid corner cases that might result in modifying this stub.
-//    if get_current_epoch(state) <= GENESIS_EPOCH + 1:
-//        return
-//    previous_attestations = get_matching_target_attestations(state, get_previous_epoch(state))
-//    current_attestations = get_matching_target_attestations(state, get_current_epoch(state))
-//    total_active_balance = get_total_active_balance(state)
-//    previous_target_balance = get_attesting_balance(state, previous_attestations)
-//    current_target_balance = get_attesting_balance(state, current_attestations)
-//    weigh_justification_and_finalization(state, total_active_balance, previous_target_balance, current_target_balance)
+//
+//	def process_justification_and_finalization(state: BeaconState) -> None:
+//	  # Initial FFG checkpoint values have a `0x00` stub for `root`.
+//	  # Skip FFG updates in the first two epochs to avoid corner cases that might result in modifying this stub.
+//	  if get_current_epoch(state) <= GENESIS_EPOCH + 1:
+//	      return
+//	  previous_attestations = get_matching_target_attestations(state, get_previous_epoch(state))
+//	  current_attestations = get_matching_target_attestations(state, get_current_epoch(state))
+//	  total_active_balance = get_total_active_balance(state)
+//	  previous_target_balance = get_attesting_balance(state, previous_attestations)
+//	  current_target_balance = get_attesting_balance(state, current_attestations)
+//	  weigh_justification_and_finalization(state, total_active_balance, previous_target_balance, current_target_balance)
 func ProcessJustificationAndFinalizationPreCompute(state state.BeaconState, pBal *Balance) (state.BeaconState, error) {
 	canProcessSlot, err := slots.EpochStart(2 /*epoch*/)
 	if err != nil {
@@ -83,7 +84,7 @@ func processJustificationBits(state state.BeaconState, totalActiveBalance, prevE
 	return newBits
 }

-// updateJustificationAndFinalization processes justification and finalization during
+// weighJustificationAndFinalization processes justification and finalization during
 // epoch processing. This is where a beacon node can justify and finalize a new epoch.
 func weighJustificationAndFinalization(state state.BeaconState, newBits bitfield.Bitvector4) (state.BeaconState, error) {
 	jc, fc, err := computeCheckpoints(state, newBits)
@@ -113,41 +114,42 @@ func weighJustificationAndFinalization(state state.BeaconState, newBits bitfield
 // checkpoints at epoch transition
 // Spec pseudocode definition:
 // def weigh_justification_and_finalization(state: BeaconState,
-//                                         total_active_balance: Gwei,
-//                                         previous_epoch_target_balance: Gwei,
-//                                         current_epoch_target_balance: Gwei) -> None:
-//    previous_epoch = get_previous_epoch(state)
-//    current_epoch = get_current_epoch(state)
-//    old_previous_justified_checkpoint = state.previous_justified_checkpoint
-//    old_current_justified_checkpoint = state.current_justified_checkpoint
 //
-//    # Process justifications
-//    state.previous_justified_checkpoint = state.current_justified_checkpoint
-//    state.justification_bits[1:] = state.justification_bits[:JUSTIFICATION_BITS_LENGTH - 1]
-//    state.justification_bits[0] = 0b0
-//    if previous_epoch_target_balance * 3 >= total_active_balance * 2:
-//        state.current_justified_checkpoint = Checkpoint(epoch=previous_epoch,
-//                                                        root=get_block_root(state, previous_epoch))
-//        state.justification_bits[1] = 0b1
-//    if current_epoch_target_balance * 3 >= total_active_balance * 2:
-//        state.current_justified_checkpoint = Checkpoint(epoch=current_epoch,
-//                                                        root=get_block_root(state, current_epoch))
-//        state.justification_bits[0] = 0b1
+//	                                     total_active_balance: Gwei,
+//	                                     previous_epoch_target_balance: Gwei,
+//	                                     current_epoch_target_balance: Gwei) -> None:
+//	previous_epoch = get_previous_epoch(state)
+//	current_epoch = get_current_epoch(state)
+//	old_previous_justified_checkpoint = state.previous_justified_checkpoint
+//	old_current_justified_checkpoint = state.current_justified_checkpoint
 //
-//    # Process finalizations
-//    bits = state.justification_bits
-//    # The 2nd/3rd/4th most recent epochs are justified, the 2nd using the 4th as source
-//    if all(bits[1:4]) and old_previous_justified_checkpoint.epoch + 3 == current_epoch:
-//        state.finalized_checkpoint = old_previous_justified_checkpoint
-//    # The 2nd/3rd most recent epochs are justified, the 2nd using the 3rd as source
-//    if all(bits[1:3]) and old_previous_justified_checkpoint.epoch + 2 == current_epoch:
-//        state.finalized_checkpoint = old_previous_justified_checkpoint
-//    # The 1st/2nd/3rd most recent epochs are justified, the 1st using the 3rd as source
-//    if all(bits[0:3]) and old_current_justified_checkpoint.epoch + 2 == current_epoch:
-//        state.finalized_checkpoint = old_current_justified_checkpoint
-//    # The 1st/2nd most recent epochs are justified, the 1st using the 2nd as source
-//    if all(bits[0:2]) and old_current_justified_checkpoint.epoch + 1 == current_epoch:
-//        state.finalized_checkpoint = old_current_justified_checkpoint
+//	# Process justifications
+//	state.previous_justified_checkpoint = state.current_justified_checkpoint
+//	state.justification_bits[1:] = state.justification_bits[:JUSTIFICATION_BITS_LENGTH - 1]
+//	state.justification_bits[0] = 0b0
+//	if previous_epoch_target_balance * 3 >= total_active_balance * 2:
+//	    state.current_justified_checkpoint = Checkpoint(epoch=previous_epoch,
+//	                                                    root=get_block_root(state, previous_epoch))
+//	    state.justification_bits[1] = 0b1
+//	if current_epoch_target_balance * 3 >= total_active_balance * 2:
+//	    state.current_justified_checkpoint = Checkpoint(epoch=current_epoch,
+//	                                                    root=get_block_root(state, current_epoch))
+//	    state.justification_bits[0] = 0b1
+//
+//	# Process finalizations
+//	bits = state.justification_bits
+//	# The 2nd/3rd/4th most recent epochs are justified, the 2nd using the 4th as source
+//	if all(bits[1:4]) and old_previous_justified_checkpoint.epoch + 3 == current_epoch:
+//	    state.finalized_checkpoint = old_previous_justified_checkpoint
+//	# The 2nd/3rd most recent epochs are justified, the 2nd using the 3rd as source
+//	if all(bits[1:3]) and old_previous_justified_checkpoint.epoch + 2 == current_epoch:
+//	    state.finalized_checkpoint = old_previous_justified_checkpoint
+//	# The 1st/2nd/3rd most recent epochs are justified, the 1st using the 3rd as source
+//	if all(bits[0:3]) and old_current_justified_checkpoint.epoch + 2 == current_epoch:
+//	    state.finalized_checkpoint = old_current_justified_checkpoint
+//	# The 1st/2nd most recent epochs are justified, the 1st using the 2nd as source
+//	if all(bits[0:2]) and old_current_justified_checkpoint.epoch + 1 == current_epoch:
+//	    state.finalized_checkpoint = old_current_justified_checkpoint
 func computeCheckpoints(state state.BeaconState, newBits bitfield.Bitvector4) (*ethpb.Checkpoint, *ethpb.Checkpoint, error) {
 	prevEpoch := time.PrevEpoch(state)
 	currentEpoch := time.CurrentEpoch(state)
--- a/beacon-chain/core/epoch/precompute/reward_penalty_test.go
+++ b/beacon-chain/core/epoch/precompute/reward_penalty_test.go
@@ -358,10 +358,11 @@ func TestProposerDeltaPrecompute_SlashedCase(t *testing.T) {
 // individual validator's base reward quotient.
 //
 // Spec pseudocode definition:
-//  def get_base_reward(state: BeaconState, index: ValidatorIndex) -> Gwei:
-//    total_balance = get_total_active_balance(state)
-//    effective_balance = state.validators[index].effective_balance
-//    return Gwei(effective_balance * BASE_REWARD_FACTOR // integer_squareroot(total_balance) // BASE_REWARDS_PER_EPOCH)
+//
+//	def get_base_reward(state: BeaconState, index: ValidatorIndex) -> Gwei:
+//	  total_balance = get_total_active_balance(state)
+//	  effective_balance = state.validators[index].effective_balance
+//	  return Gwei(effective_balance * BASE_REWARD_FACTOR // integer_squareroot(total_balance) // BASE_REWARDS_PER_EPOCH)
 func baseReward(state state.ReadOnlyBeaconState, index types.ValidatorIndex) (uint64, error) {
 	totalBalance, err := helpers.TotalActiveBalance(state)
 	if err != nil {
--- a/beacon-chain/core/execution/BUILD.bazel
+++ b/beacon-chain/core/execution/BUILD.bazel
@@ -6,6 +6,7 @@ go_library(
    importpath = "github.com/prysmaticlabs/prysm/v3/beacon-chain/core/execution",
    visibility = [
        "//beacon-chain:__subpackages__",
+        "//cmd/prysmctl/testnet:__pkg__",
        "//testing/spectest:__subpackages__",
        "//validator/client:__pkg__",
    ],
--- a/beacon-chain/core/execution/upgrade.go
+++ b/beacon-chain/core/execution/upgrade.go
@@ -35,6 +35,10 @@ func UpgradeToBellatrix(state state.BeaconState) (state.BeaconState, error) {
 		return nil, err
 	}

+	hrs, err := state.HistoricalRoots()
+	if err != nil {
+		return nil, err
+	}
 	s := &ethpb.BeaconStateBellatrix{
 		GenesisTime:           state.GenesisTime(),
 		GenesisValidatorsRoot: state.GenesisValidatorsRoot(),
@@ -47,7 +51,7 @@ func UpgradeToBellatrix(state state.BeaconState) (state.BeaconState, error) {
 		LatestBlockHeader:           state.LatestBlockHeader(),
 		BlockRoots:                  state.BlockRoots(),
 		StateRoots:                  state.StateRoots(),
-		HistoricalRoots:             state.HistoricalRoots(),
+		HistoricalRoots:             hrs,
 		Eth1Data:                    state.Eth1Data(),
 		Eth1DataVotes:               state.Eth1DataVotes(),
 		Eth1DepositIndex:            state.Eth1DepositIndex(),
--- a/beacon-chain/core/execution/upgrade_test.go
+++ b/beacon-chain/core/execution/upgrade_test.go
@@ -24,7 +24,11 @@ func TestUpgradeToBellatrix(t *testing.T) {
 	require.DeepSSZEqual(t, preForkState.LatestBlockHeader(), mSt.LatestBlockHeader())
 	require.DeepSSZEqual(t, preForkState.BlockRoots(), mSt.BlockRoots())
 	require.DeepSSZEqual(t, preForkState.StateRoots(), mSt.StateRoots())
-	require.DeepSSZEqual(t, preForkState.HistoricalRoots(), mSt.HistoricalRoots())
+	r1, err := preForkState.HistoricalRoots()
+	require.NoError(t, err)
+	r2, err := mSt.HistoricalRoots()
+	require.NoError(t, err)
+	require.DeepSSZEqual(t, r1, r2)
 	require.DeepSSZEqual(t, preForkState.Eth1Data(), mSt.Eth1Data())
 	require.DeepSSZEqual(t, preForkState.Eth1DataVotes(), mSt.Eth1DataVotes())
 	require.DeepSSZEqual(t, preForkState.Eth1DepositIndex(), mSt.Eth1DepositIndex())
--- a/beacon-chain/core/feed/operation/events.go
+++ b/beacon-chain/core/feed/operation/events.go
@@ -19,6 +19,9 @@ const (

 	// SyncCommitteeContributionReceived is sent after a sync committee contribution object has been received.
 	SyncCommitteeContributionReceived
+
+	// BLSToExecutionChangeReceived is sent after a BLS to execution change object has been received from gossip or rpc.
+	BLSToExecutionChangeReceived
 )

 // UnAggregatedAttReceivedData is the data sent with UnaggregatedAttReceived events.
@@ -44,3 +47,8 @@ type SyncCommitteeContributionReceivedData struct {
 	// Contribution is the sync committee contribution object.
 	Contribution *ethpb.SignedContributionAndProof
 }
+
+// BLSToExecutionChangeReceivedData is the data sent with BLSToExecutionChangeReceived events.
+type BLSToExecutionChangeReceivedData struct {
+	Change *ethpb.SignedBLSToExecutionChange
+}
--- a/beacon-chain/core/helpers/beacon_committee.go
+++ b/beacon-chain/core/helpers/beacon_committee.go
@@ -35,14 +35,15 @@ var (
 // count.
 //
 // Spec pseudocode definition:
-//   def get_committee_count_per_slot(state: BeaconState, epoch: Epoch) -> uint64:
-//    """
-//    Return the number of committees in each slot for the given ``epoch``.
-//    """
-//    return max(uint64(1), min(
-//        MAX_COMMITTEES_PER_SLOT,
-//        uint64(len(get_active_validator_indices(state, epoch))) // SLOTS_PER_EPOCH // TARGET_COMMITTEE_SIZE,
-//    ))
+//
+//	def get_committee_count_per_slot(state: BeaconState, epoch: Epoch) -> uint64:
+//	 """
+//	 Return the number of committees in each slot for the given ``epoch``.
+//	 """
+//	 return max(uint64(1), min(
+//	     MAX_COMMITTEES_PER_SLOT,
+//	     uint64(len(get_active_validator_indices(state, epoch))) // SLOTS_PER_EPOCH // TARGET_COMMITTEE_SIZE,
+//	 ))
 func SlotCommitteeCount(activeValidatorCount uint64) uint64 {
 	var committeesPerSlot = activeValidatorCount / uint64(params.BeaconConfig().SlotsPerEpoch) / params.BeaconConfig().TargetCommitteeSize

@@ -61,18 +62,19 @@ func SlotCommitteeCount(activeValidatorCount uint64) uint64 {
 // becomes expensive, consider using BeaconCommittee below.
 //
 // Spec pseudocode definition:
-//   def get_beacon_committee(state: BeaconState, slot: Slot, index: CommitteeIndex) -> Sequence[ValidatorIndex]:
-//    """
-//    Return the beacon committee at ``slot`` for ``index``.
-//    """
-//    epoch = compute_epoch_at_slot(slot)
-//    committees_per_slot = get_committee_count_per_slot(state, epoch)
-//    return compute_committee(
-//        indices=get_active_validator_indices(state, epoch),
-//        seed=get_seed(state, epoch, DOMAIN_BEACON_ATTESTER),
-//        index=(slot % SLOTS_PER_EPOCH) * committees_per_slot + index,
-//        count=committees_per_slot * SLOTS_PER_EPOCH,
-//    )
+//
+//	def get_beacon_committee(state: BeaconState, slot: Slot, index: CommitteeIndex) -> Sequence[ValidatorIndex]:
+//	 """
+//	 Return the beacon committee at ``slot`` for ``index``.
+//	 """
+//	 epoch = compute_epoch_at_slot(slot)
+//	 committees_per_slot = get_committee_count_per_slot(state, epoch)
+//	 return compute_committee(
+//	     indices=get_active_validator_indices(state, epoch),
+//	     seed=get_seed(state, epoch, DOMAIN_BEACON_ATTESTER),
+//	     index=(slot % SLOTS_PER_EPOCH) * committees_per_slot + index,
+//	     count=committees_per_slot * SLOTS_PER_EPOCH,
+//	 )
 func BeaconCommitteeFromState(ctx context.Context, state state.ReadOnlyBeaconState, slot types.Slot, committeeIndex types.CommitteeIndex) ([]types.ValidatorIndex, error) {
 	epoch := slots.ToEpoch(slot)
 	seed, err := Seed(state, epoch, params.BeaconConfig().DomainBeaconAttester)
@@ -101,18 +103,19 @@ func BeaconCommitteeFromState(ctx context.Context, state state.ReadOnlyBeaconSta
 // from the spec definition. Having them as an argument allows for cheaper computation run time.
 //
 // Spec pseudocode definition:
-//   def get_beacon_committee(state: BeaconState, slot: Slot, index: CommitteeIndex) -> Sequence[ValidatorIndex]:
-//    """
-//    Return the beacon committee at ``slot`` for ``index``.
-//    """
-//    epoch = compute_epoch_at_slot(slot)
-//    committees_per_slot = get_committee_count_per_slot(state, epoch)
-//    return compute_committee(
-//        indices=get_active_validator_indices(state, epoch),
-//        seed=get_seed(state, epoch, DOMAIN_BEACON_ATTESTER),
-//        index=(slot % SLOTS_PER_EPOCH) * committees_per_slot + index,
-//        count=committees_per_slot * SLOTS_PER_EPOCH,
-//    )
+//
+//	def get_beacon_committee(state: BeaconState, slot: Slot, index: CommitteeIndex) -> Sequence[ValidatorIndex]:
+//	 """
+//	 Return the beacon committee at ``slot`` for ``index``.
+//	 """
+//	 epoch = compute_epoch_at_slot(slot)
+//	 committees_per_slot = get_committee_count_per_slot(state, epoch)
+//	 return compute_committee(
+//	     indices=get_active_validator_indices(state, epoch),
+//	     seed=get_seed(state, epoch, DOMAIN_BEACON_ATTESTER),
+//	     index=(slot % SLOTS_PER_EPOCH) * committees_per_slot + index,
+//	     count=committees_per_slot * SLOTS_PER_EPOCH,
+//	 )
 func BeaconCommittee(
 	ctx context.Context,
 	validatorIndices []types.ValidatorIndex,
@@ -174,6 +177,14 @@ func CommitteeAssignments(
 	if err != nil {
 		return nil, nil, err
 	}
+	minValidStartSlot := types.Slot(0)
+	if state.Slot() >= params.BeaconConfig().SlotsPerHistoricalRoot {
+		minValidStartSlot = state.Slot() - params.BeaconConfig().SlotsPerHistoricalRoot
+	}
+	if startSlot < minValidStartSlot {
+		return nil, nil, fmt.Errorf("start slot %d is smaller than the minimum valid start slot %d", startSlot, minValidStartSlot)
+	}
+
 	proposerIndexToSlots := make(map[types.ValidatorIndex][]types.Slot, params.BeaconConfig().SlotsPerEpoch)
 	for slot := startSlot; slot < startSlot+params.BeaconConfig().SlotsPerEpoch; slot++ {
 		// Skip proposer assignment for genesis slot.
@@ -381,16 +392,17 @@ func ClearCache() {
 // validator indices and seed.
 //
 // Spec pseudocode definition:
-//  def compute_committee(indices: Sequence[ValidatorIndex],
-//                      seed: Bytes32,
-//                      index: uint64,
-//                      count: uint64) -> Sequence[ValidatorIndex]:
-//    """
-//    Return the committee corresponding to ``indices``, ``seed``, ``index``, and committee ``count``.
-//    """
-//    start = (len(indices) * index) // count
-//    end = (len(indices) * uint64(index + 1)) // count
-//    return [indices[compute_shuffled_index(uint64(i), uint64(len(indices)), seed)] for i in range(start, end)]
+//
+//	def compute_committee(indices: Sequence[ValidatorIndex],
+//	                    seed: Bytes32,
+//	                    index: uint64,
+//	                    count: uint64) -> Sequence[ValidatorIndex]:
+//	  """
+//	  Return the committee corresponding to ``indices``, ``seed``, ``index``, and committee ``count``.
+//	  """
+//	  start = (len(indices) * index) // count
+//	  end = (len(indices) * uint64(index + 1)) // count
+//	  return [indices[compute_shuffled_index(uint64(i), uint64(len(indices)), seed)] for i in range(start, end)]
 func computeCommittee(
 	indices []types.ValidatorIndex,
 	seed [32]byte,
--- a/beacon-chain/core/helpers/beacon_committee_test.go
+++ b/beacon-chain/core/helpers/beacon_committee_test.go
@@ -235,6 +235,25 @@ func TestCommitteeAssignments_CannotRetrieveFuture(t *testing.T) {
 	require.NotEqual(t, 0, len(proposerIndxs), "wanted non-zero proposer index set")
 }

+func TestCommitteeAssignments_CannotRetrieveOlderThanSlotsPerHistoricalRoot(t *testing.T) {
+	// Initialize test with 256 validators, each slot and each index gets 4 validators.
+	validators := make([]*ethpb.Validator, 4*params.BeaconConfig().SlotsPerEpoch)
+	for i := 0; i < len(validators); i++ {
+		validators[i] = &ethpb.Validator{
+			ExitEpoch: params.BeaconConfig().FarFutureEpoch,
+		}
+	}
+
+	state, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
+		Validators:  validators,
+		Slot:        params.BeaconConfig().SlotsPerHistoricalRoot + 1,
+		RandaoMixes: make([][]byte, params.BeaconConfig().EpochsPerHistoricalVector),
+	})
+	require.NoError(t, err)
+	_, _, err = CommitteeAssignments(context.Background(), state, 0)
+	require.ErrorContains(t, "start slot 0 is smaller than the minimum valid start slot 1", err)
+}
+
 func TestCommitteeAssignments_EverySlotHasMin1Proposer(t *testing.T) {
 	// Initialize test with 256 validators, each slot and each index gets 4 validators.
 	validators := make([]*ethpb.Validator, 4*params.BeaconConfig().SlotsPerEpoch)
--- a/beacon-chain/core/helpers/block.go
+++ b/beacon-chain/core/helpers/block.go
@@ -14,12 +14,13 @@ import (
 // It returns an error if the requested block root is not within the slot range.
 //
 // Spec pseudocode definition:
-//  def get_block_root_at_slot(state: BeaconState, slot: Slot) -> Root:
-//    """
-//    Return the block root at a recent ``slot``.
-//    """
-//    assert slot < state.slot <= slot + SLOTS_PER_HISTORICAL_ROOT
-//    return state.block_roots[slot % SLOTS_PER_HISTORICAL_ROOT]
+//
+//	def get_block_root_at_slot(state: BeaconState, slot: Slot) -> Root:
+//	  """
+//	  Return the block root at a recent ``slot``.
+//	  """
+//	  assert slot < state.slot <= slot + SLOTS_PER_HISTORICAL_ROOT
+//	  return state.block_roots[slot % SLOTS_PER_HISTORICAL_ROOT]
 func BlockRootAtSlot(state state.ReadOnlyBeaconState, slot types.Slot) ([]byte, error) {
 	if math.MaxUint64-slot < params.BeaconConfig().SlotsPerHistoricalRoot {
 		return []byte{}, errors.New("slot overflows uint64")
@@ -42,11 +43,12 @@ func StateRootAtSlot(state state.ReadOnlyBeaconState, slot types.Slot) ([]byte,
 // BlockRoot returns the block root stored in the BeaconState for epoch start slot.
 //
 // Spec pseudocode definition:
-//  def get_block_root(state: BeaconState, epoch: Epoch) -> Root:
-//    """
-//    Return the block root at the start of a recent ``epoch``.
-//    """
-//    return get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch))
+//
+//	def get_block_root(state: BeaconState, epoch: Epoch) -> Root:
+//	  """
+//	  Return the block root at the start of a recent ``epoch``.
+//	  """
+//	  return get_block_root_at_slot(state, compute_start_slot_at_epoch(epoch))
 func BlockRoot(state state.ReadOnlyBeaconState, epoch types.Epoch) ([]byte, error) {
 	s, err := slots.EpochStart(epoch)
 	if err != nil {
--- a/beacon-chain/core/helpers/randao.go
+++ b/beacon-chain/core/helpers/randao.go
@@ -12,12 +12,13 @@ import (
 // Seed returns the randao seed used for shuffling of a given epoch.
 //
 // Spec pseudocode definition:
-//  def get_seed(state: BeaconState, epoch: Epoch, domain_type: DomainType) -> Bytes32:
-//    """
-//    Return the seed at ``epoch``.
-//    """
-//    mix = get_randao_mix(state, Epoch(epoch + EPOCHS_PER_HISTORICAL_VECTOR - MIN_SEED_LOOKAHEAD - 1))  # Avoid underflow
-//    return hash(domain_type + uint_to_bytes(epoch) + mix)
+//
+//	def get_seed(state: BeaconState, epoch: Epoch, domain_type: DomainType) -> Bytes32:
+//	  """
+//	  Return the seed at ``epoch``.
+//	  """
+//	  mix = get_randao_mix(state, Epoch(epoch + EPOCHS_PER_HISTORICAL_VECTOR - MIN_SEED_LOOKAHEAD - 1))  # Avoid underflow
+//	  return hash(domain_type + uint_to_bytes(epoch) + mix)
 func Seed(state state.ReadOnlyBeaconState, epoch types.Epoch, domain [bls.DomainByteLength]byte) ([32]byte, error) {
 	// See https://github.com/ethereum/consensus-specs/pull/1296 for
 	// rationale on why offset has to look down by 1.
@@ -40,11 +41,12 @@ func Seed(state state.ReadOnlyBeaconState, epoch types.Epoch, domain [bls.Domain
 // of a given slot. It is used to shuffle validators.
 //
 // Spec pseudocode definition:
-//   def get_randao_mix(state: BeaconState, epoch: Epoch) -> Bytes32:
-//    """
-//    Return the randao mix at a recent ``epoch``.
-//    """
-//    return state.randao_mixes[epoch % EPOCHS_PER_HISTORICAL_VECTOR]
+//
+//	def get_randao_mix(state: BeaconState, epoch: Epoch) -> Bytes32:
+//	 """
+//	 Return the randao mix at a recent ``epoch``.
+//	 """
+//	 return state.randao_mixes[epoch % EPOCHS_PER_HISTORICAL_VECTOR]
 func RandaoMix(state state.ReadOnlyBeaconState, epoch types.Epoch) ([]byte, error) {
 	return state.RandaoMixAtIndex(uint64(epoch % params.BeaconConfig().EpochsPerHistoricalVector))
 }
--- a/beacon-chain/core/helpers/rewards_penalties.go
+++ b/beacon-chain/core/helpers/rewards_penalties.go
@@ -17,13 +17,14 @@ var balanceCache = cache.NewEffectiveBalanceCache()
 // of input validators.
 //
 // Spec pseudocode definition:
-//   def get_total_balance(state: BeaconState, indices: Set[ValidatorIndex]) -> Gwei:
-//    """
-//    Return the combined effective balance of the ``indices``.
-//    ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
-//    Math safe up to ~10B ETH, afterwhich this overflows uint64.
-//    """
-//    return Gwei(max(EFFECTIVE_BALANCE_INCREMENT, sum([state.validators[index].effective_balance for index in indices])))
+//
+//	def get_total_balance(state: BeaconState, indices: Set[ValidatorIndex]) -> Gwei:
+//	 """
+//	 Return the combined effective balance of the ``indices``.
+//	 ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
+//	 Math safe up to ~10B ETH, afterwhich this overflows uint64.
+//	 """
+//	 return Gwei(max(EFFECTIVE_BALANCE_INCREMENT, sum([state.validators[index].effective_balance for index in indices])))
 func TotalBalance(state state.ReadOnlyValidators, indices []types.ValidatorIndex) uint64 {
 	total := uint64(0)

@@ -47,12 +48,13 @@ func TotalBalance(state state.ReadOnlyValidators, indices []types.ValidatorIndex
 // of active validators.
 //
 // Spec pseudocode definition:
-//   def get_total_active_balance(state: BeaconState) -> Gwei:
-//    """
-//    Return the combined effective balance of the active validators.
-//    Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
-//    """
-//    return get_total_balance(state, set(get_active_validator_indices(state, get_current_epoch(state))))
+//
+//	def get_total_active_balance(state: BeaconState) -> Gwei:
+//	 """
+//	 Return the combined effective balance of the active validators.
+//	 Note: ``get_total_balance`` returns ``EFFECTIVE_BALANCE_INCREMENT`` Gwei minimum to avoid divisions by zero.
+//	 """
+//	 return get_total_balance(state, set(get_active_validator_indices(state, get_current_epoch(state))))
 func TotalActiveBalance(s state.ReadOnlyBeaconState) (uint64, error) {
 	bal, err := balanceCache.Get(s)
 	switch {
@@ -88,11 +90,12 @@ func TotalActiveBalance(s state.ReadOnlyBeaconState) (uint64, error) {
 // IncreaseBalance increases validator with the given 'index' balance by 'delta' in Gwei.
 //
 // Spec pseudocode definition:
-//  def increase_balance(state: BeaconState, index: ValidatorIndex, delta: Gwei) -> None:
-//    """
-//    Increase the validator balance at index ``index`` by ``delta``.
-//    """
-//    state.balances[index] += delta
+//
+//	def increase_balance(state: BeaconState, index: ValidatorIndex, delta: Gwei) -> None:
+//	  """
+//	  Increase the validator balance at index ``index`` by ``delta``.
+//	  """
+//	  state.balances[index] += delta
 func IncreaseBalance(state state.BeaconState, idx types.ValidatorIndex, delta uint64) error {
 	balAtIdx, err := state.BalanceAtIndex(idx)
 	if err != nil {
@@ -110,11 +113,12 @@ func IncreaseBalance(state state.BeaconState, idx types.ValidatorIndex, delta ui
 // the post balance.
 //
 // Spec pseudocode definition:
-//  def increase_balance(state: BeaconState, index: ValidatorIndex, delta: Gwei) -> None:
-//    """
-//    Increase the validator balance at index ``index`` by ``delta``.
-//    """
-//    state.balances[index] += delta
+//
+//	def increase_balance(state: BeaconState, index: ValidatorIndex, delta: Gwei) -> None:
+//	  """
+//	  Increase the validator balance at index ``index`` by ``delta``.
+//	  """
+//	  state.balances[index] += delta
 func IncreaseBalanceWithVal(currBalance, delta uint64) (uint64, error) {
 	return mathutil.Add64(currBalance, delta)
 }
@@ -122,11 +126,12 @@ func IncreaseBalanceWithVal(currBalance, delta uint64) (uint64, error) {
 // DecreaseBalance decreases validator with the given 'index' balance by 'delta' in Gwei.
 //
 // Spec pseudocode definition:
-//  def decrease_balance(state: BeaconState, index: ValidatorIndex, delta: Gwei) -> None:
-//    """
-//    Decrease the validator balance at index ``index`` by ``delta``, with underflow protection.
-//    """
-//    state.balances[index] = 0 if delta > state.balances[index] else state.balances[index] - delta
+//
+//	def decrease_balance(state: BeaconState, index: ValidatorIndex, delta: Gwei) -> None:
+//	  """
+//	  Decrease the validator balance at index ``index`` by ``delta``, with underflow protection.
+//	  """
+//	  state.balances[index] = 0 if delta > state.balances[index] else state.balances[index] - delta
 func DecreaseBalance(state state.BeaconState, idx types.ValidatorIndex, delta uint64) error {
 	balAtIdx, err := state.BalanceAtIndex(idx)
 	if err != nil {
@@ -140,11 +145,12 @@ func DecreaseBalance(state state.BeaconState, idx types.ValidatorIndex, delta ui
 // the post balance.
 //
 // Spec pseudocode definition:
-//  def decrease_balance(state: BeaconState, index: ValidatorIndex, delta: Gwei) -> None:
-//    """
-//    Decrease the validator balance at index ``index`` by ``delta``, with underflow protection.
-//    """
-//    state.balances[index] = 0 if delta > state.balances[index] else state.balances[index] - delta
+//
+//	def decrease_balance(state: BeaconState, index: ValidatorIndex, delta: Gwei) -> None:
+//	  """
+//	  Decrease the validator balance at index ``index`` by ``delta``, with underflow protection.
+//	  """
+//	  state.balances[index] = 0 if delta > state.balances[index] else state.balances[index] - delta
 func DecreaseBalanceWithVal(currBalance, delta uint64) uint64 {
 	if delta > currBalance {
 		return 0
@@ -156,7 +162,8 @@ func DecreaseBalanceWithVal(currBalance, delta uint64) uint64 {
 //
 // Spec code:
 // def is_in_inactivity_leak(state: BeaconState) -> bool:
-//    return get_finality_delay(state) > MIN_EPOCHS_TO_INACTIVITY_PENALTY
+//
+//	return get_finality_delay(state) > MIN_EPOCHS_TO_INACTIVITY_PENALTY
 func IsInInactivityLeak(prevEpoch, finalizedEpoch types.Epoch) bool {
 	return FinalityDelay(prevEpoch, finalizedEpoch) > params.BeaconConfig().MinEpochsToInactivityPenalty
 }
@@ -165,7 +172,8 @@ func IsInInactivityLeak(prevEpoch, finalizedEpoch types.Epoch) bool {
 //
 // Spec code:
 // def get_finality_delay(state: BeaconState) -> uint64:
-//    return get_previous_epoch(state) - state.finalized_checkpoint.epoch
+//
+//	return get_previous_epoch(state) - state.finalized_checkpoint.epoch
 func FinalityDelay(prevEpoch, finalizedEpoch types.Epoch) types.Epoch {
 	return prevEpoch - finalizedEpoch
 }
--- a/beacon-chain/core/helpers/shuffle.go
+++ b/beacon-chain/core/helpers/shuffle.go
@@ -31,7 +31,7 @@ func SplitIndices(l []uint64, n uint64) [][]uint64 {
 	return divided
 }

-// ShuffledIndex returns `p(index)` in a pseudorandom permutation `p` of `0...list_size - 1` with ``seed`` as entropy.
+// ShuffledIndex returns `p(index)` in a pseudorandom permutation `p` of `0...list_size - 1` with “seed“ as entropy.
 // We utilize 'swap or not' shuffling in this implementation; we are allocating the memory with the seed that stays
 // constant between iterations instead of reallocating it each iteration as in the spec. This implementation is based
 // on the original implementation from protolambda, https://github.com/protolambda/eth2-shuffle
@@ -47,28 +47,29 @@ func UnShuffledIndex(index types.ValidatorIndex, indexCount uint64, seed [32]byt

 // ComputeShuffledIndex returns the shuffled validator index corresponding to seed and index count.
 // Spec pseudocode definition:
-//   def compute_shuffled_index(index: uint64, index_count: uint64, seed: Bytes32) -> uint64:
-//    """
-//    Return the shuffled index corresponding to ``seed`` (and ``index_count``).
-//    """
-//    assert index < index_count
 //
-//    # Swap or not (https://link.springer.com/content/pdf/10.1007%2F978-3-642-32009-5_1.pdf)
-//    # See the 'generalized domain' algorithm on page 3
-//    for current_round in range(SHUFFLE_ROUND_COUNT):
-//        pivot = bytes_to_uint64(hash(seed + uint_to_bytes(uint8(current_round)))[0:8]) % index_count
-//        flip = (pivot + index_count - index) % index_count
-//        position = max(index, flip)
-//        source = hash(
-//            seed
-//            + uint_to_bytes(uint8(current_round))
-//            + uint_to_bytes(uint32(position // 256))
-//        )
-//        byte = uint8(source[(position % 256) // 8])
-//        bit = (byte >> (position % 8)) % 2
-//        index = flip if bit else index
+//	def compute_shuffled_index(index: uint64, index_count: uint64, seed: Bytes32) -> uint64:
+//	 """
+//	 Return the shuffled index corresponding to ``seed`` (and ``index_count``).
+//	 """
+//	 assert index < index_count
 //
-//    return index
+//	 # Swap or not (https://link.springer.com/content/pdf/10.1007%2F978-3-642-32009-5_1.pdf)
+//	 # See the 'generalized domain' algorithm on page 3
+//	 for current_round in range(SHUFFLE_ROUND_COUNT):
+//	     pivot = bytes_to_uint64(hash(seed + uint_to_bytes(uint8(current_round)))[0:8]) % index_count
+//	     flip = (pivot + index_count - index) % index_count
+//	     position = max(index, flip)
+//	     source = hash(
+//	         seed
+//	         + uint_to_bytes(uint8(current_round))
+//	         + uint_to_bytes(uint32(position // 256))
+//	     )
+//	     byte = uint8(source[(position % 256) // 8])
+//	     bit = (byte >> (position % 8)) % 2
+//	     index = flip if bit else index
+//
+//	 return index
 func ComputeShuffledIndex(index types.ValidatorIndex, indexCount uint64, seed [32]byte, shuffle bool) (types.ValidatorIndex, error) {
 	if params.BeaconConfig().ShuffleRoundCount == 0 {
 		return index, nil
@@ -135,20 +136,21 @@ func ComputeShuffledIndex(index types.ValidatorIndex, indexCount uint64, seed [3
 	return index, nil
 }

-// ShuffleList returns list of shuffled indexes in a pseudorandom permutation `p` of `0...list_size - 1` with ``seed`` as entropy.
+// ShuffleList returns list of shuffled indexes in a pseudorandom permutation `p` of `0...list_size - 1` with “seed“ as entropy.
 // We utilize 'swap or not' shuffling in this implementation; we are allocating the memory with the seed that stays
 // constant between iterations instead of reallocating it each iteration as in the spec. This implementation is based
 // on the original implementation from protolambda, https://github.com/protolambda/eth2-shuffle
-//  improvements:
-//   - seed is always the first 32 bytes of the hash input, we just copy it into the buffer one time.
-//   - add round byte to seed and hash that part of the buffer.
-//   - split up the for-loop in two:
-//    1. Handle the part from 0 (incl) to pivot (incl). This is mirrored around (pivot / 2).
-//    2. Handle the part from pivot (excl) to N (excl). This is mirrored around ((pivot / 2) + (size/2)).
-//   - hash source every 256 iterations.
-//   - change byteV every 8 iterations.
-//   - we start at the edges, and work back to the mirror point.
-//     this makes us process each pear exactly once (instead of unnecessarily twice, like in the spec).
+//
+//	improvements:
+//	 - seed is always the first 32 bytes of the hash input, we just copy it into the buffer one time.
+//	 - add round byte to seed and hash that part of the buffer.
+//	 - split up the for-loop in two:
+//	  1. Handle the part from 0 (incl) to pivot (incl). This is mirrored around (pivot / 2).
+//	  2. Handle the part from pivot (excl) to N (excl). This is mirrored around ((pivot / 2) + (size/2)).
+//	 - hash source every 256 iterations.
+//	 - change byteV every 8 iterations.
+//	 - we start at the edges, and work back to the mirror point.
+//	   this makes us process each pear exactly once (instead of unnecessarily twice, like in the spec).
 func ShuffleList(input []types.ValidatorIndex, seed [32]byte) ([]types.ValidatorIndex, error) {
 	return innerShuffleList(input, seed, true /* shuffle */)
 }
--- a/beacon-chain/core/helpers/validators.go
+++ b/beacon-chain/core/helpers/validators.go
@@ -28,11 +28,12 @@ var CommitteeCacheInProgressHit = promauto.NewCounter(prometheus.CounterOpts{
 // is active or not.
 //
 // Spec pseudocode definition:
-//  def is_active_validator(validator: Validator, epoch: Epoch) -> bool:
-//    """
-//    Check if ``validator`` is active.
-//    """
-//    return validator.activation_epoch <= epoch < validator.exit_epoch
+//
+//	def is_active_validator(validator: Validator, epoch: Epoch) -> bool:
+//	  """
+//	  Check if ``validator`` is active.
+//	  """
+//	  return validator.activation_epoch <= epoch < validator.exit_epoch
 func IsActiveValidator(validator *ethpb.Validator, epoch types.Epoch) bool {
 	return checkValidatorActiveStatus(validator.ActivationEpoch, validator.ExitEpoch, epoch)
 }
@@ -50,11 +51,12 @@ func checkValidatorActiveStatus(activationEpoch, exitEpoch, epoch types.Epoch) b
 // is slashable or not.
 //
 // Spec pseudocode definition:
-//  def is_slashable_validator(validator: Validator, epoch: Epoch) -> bool:
-//  """
-//  Check if ``validator`` is slashable.
-//  """
-//  return (not validator.slashed) and (validator.activation_epoch <= epoch < validator.withdrawable_epoch)
+//
+//	def is_slashable_validator(validator: Validator, epoch: Epoch) -> bool:
+//	"""
+//	Check if ``validator`` is slashable.
+//	"""
+//	return (not validator.slashed) and (validator.activation_epoch <= epoch < validator.withdrawable_epoch)
 func IsSlashableValidator(activationEpoch, withdrawableEpoch types.Epoch, slashed bool, epoch types.Epoch) bool {
 	return checkValidatorSlashable(activationEpoch, withdrawableEpoch, slashed, epoch)
 }
@@ -78,11 +80,12 @@ func checkValidatorSlashable(activationEpoch, withdrawableEpoch types.Epoch, sla
 // need the active validator indices for some specific reason.
 //
 // Spec pseudocode definition:
-//  def get_active_validator_indices(state: BeaconState, epoch: Epoch) -> Sequence[ValidatorIndex]:
-//    """
-//    Return the sequence of active validator indices at ``epoch``.
-//    """
-//    return [ValidatorIndex(i) for i, v in enumerate(state.validators) if is_active_validator(v, epoch)]
+//
+//	def get_active_validator_indices(state: BeaconState, epoch: Epoch) -> Sequence[ValidatorIndex]:
+//	  """
+//	  Return the sequence of active validator indices at ``epoch``.
+//	  """
+//	  return [ValidatorIndex(i) for i, v in enumerate(state.validators) if is_active_validator(v, epoch)]
 func ActiveValidatorIndices(ctx context.Context, s state.ReadOnlyBeaconState, epoch types.Epoch) ([]types.ValidatorIndex, error) {
 	seed, err := Seed(s, epoch, params.BeaconConfig().DomainBeaconAttester)
 	if err != nil {
@@ -186,11 +189,12 @@ func ActiveValidatorCount(ctx context.Context, s state.ReadOnlyBeaconState, epoc
 // the validator is eligible for activation and exit.
 //
 // Spec pseudocode definition:
-//  def compute_activation_exit_epoch(epoch: Epoch) -> Epoch:
-//    """
-//    Return the epoch during which validator activations and exits initiated in ``epoch`` take effect.
-//    """
-//    return Epoch(epoch + 1 + MAX_SEED_LOOKAHEAD)
+//
+//	def compute_activation_exit_epoch(epoch: Epoch) -> Epoch:
+//	  """
+//	  Return the epoch during which validator activations and exits initiated in ``epoch`` take effect.
+//	  """
+//	  return Epoch(epoch + 1 + MAX_SEED_LOOKAHEAD)
 func ActivationExitEpoch(epoch types.Epoch) types.Epoch {
 	return epoch + 1 + params.BeaconConfig().MaxSeedLookahead
 }
@@ -199,12 +203,13 @@ func ActivationExitEpoch(epoch types.Epoch) types.Epoch {
 // enter and exit validator pool for an epoch.
 //
 // Spec pseudocode definition:
-//   def get_validator_churn_limit(state: BeaconState) -> uint64:
-//    """
-//    Return the validator churn limit for the current epoch.
-//    """
-//    active_validator_indices = get_active_validator_indices(state, get_current_epoch(state))
-//    return max(MIN_PER_EPOCH_CHURN_LIMIT, uint64(len(active_validator_indices)) // CHURN_LIMIT_QUOTIENT)
+//
+//	def get_validator_churn_limit(state: BeaconState) -> uint64:
+//	 """
+//	 Return the validator churn limit for the current epoch.
+//	 """
+//	 active_validator_indices = get_active_validator_indices(state, get_current_epoch(state))
+//	 return max(MIN_PER_EPOCH_CHURN_LIMIT, uint64(len(active_validator_indices)) // CHURN_LIMIT_QUOTIENT)
 func ValidatorChurnLimit(activeValidatorCount uint64) (uint64, error) {
 	churnLimit := activeValidatorCount / params.BeaconConfig().ChurnLimitQuotient
 	if churnLimit < params.BeaconConfig().MinPerEpochChurnLimit {
@@ -216,14 +221,15 @@ func ValidatorChurnLimit(activeValidatorCount uint64) (uint64, error) {
 // BeaconProposerIndex returns proposer index of a current slot.
 //
 // Spec pseudocode definition:
-//  def get_beacon_proposer_index(state: BeaconState) -> ValidatorIndex:
-//    """
-//    Return the beacon proposer index at the current slot.
-//    """
-//    epoch = get_current_epoch(state)
-//    seed = hash(get_seed(state, epoch, DOMAIN_BEACON_PROPOSER) + uint_to_bytes(state.slot))
-//    indices = get_active_validator_indices(state, epoch)
-//    return compute_proposer_index(state, indices, seed)
+//
+//	def get_beacon_proposer_index(state: BeaconState) -> ValidatorIndex:
+//	  """
+//	  Return the beacon proposer index at the current slot.
+//	  """
+//	  epoch = get_current_epoch(state)
+//	  seed = hash(get_seed(state, epoch, DOMAIN_BEACON_PROPOSER) + uint_to_bytes(state.slot))
+//	  indices = get_active_validator_indices(state, epoch)
+//	  return compute_proposer_index(state, indices, seed)
 func BeaconProposerIndex(ctx context.Context, state state.ReadOnlyBeaconState) (types.ValidatorIndex, error) {
 	e := time.CurrentEpoch(state)
 	// The cache uses the state root of the previous epoch - minimum_seed_lookahead last slot as key. (e.g. Starting epoch 1, slot 32, the key would be block root at slot 31)
@@ -274,21 +280,22 @@ func BeaconProposerIndex(ctx context.Context, state state.ReadOnlyBeaconState) (
 // ComputeProposerIndex returns the index sampled by effective balance, which is used to calculate proposer.
 //
 // Spec pseudocode definition:
-//  def compute_proposer_index(state: BeaconState, indices: Sequence[ValidatorIndex], seed: Bytes32) -> ValidatorIndex:
-//    """
-//    Return from ``indices`` a random index sampled by effective balance.
-//    """
-//    assert len(indices) > 0
-//    MAX_RANDOM_BYTE = 2**8 - 1
-//    i = uint64(0)
-//    total = uint64(len(indices))
-//    while True:
-//        candidate_index = indices[compute_shuffled_index(i % total, total, seed)]
-//        random_byte = hash(seed + uint_to_bytes(uint64(i // 32)))[i % 32]
-//        effective_balance = state.validators[candidate_index].effective_balance
-//        if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE * random_byte:
-//            return candidate_index
-//        i += 1
+//
+//	def compute_proposer_index(state: BeaconState, indices: Sequence[ValidatorIndex], seed: Bytes32) -> ValidatorIndex:
+//	  """
+//	  Return from ``indices`` a random index sampled by effective balance.
+//	  """
+//	  assert len(indices) > 0
+//	  MAX_RANDOM_BYTE = 2**8 - 1
+//	  i = uint64(0)
+//	  total = uint64(len(indices))
+//	  while True:
+//	      candidate_index = indices[compute_shuffled_index(i % total, total, seed)]
+//	      random_byte = hash(seed + uint_to_bytes(uint64(i // 32)))[i % 32]
+//	      effective_balance = state.validators[candidate_index].effective_balance
+//	      if effective_balance * MAX_RANDOM_BYTE >= MAX_EFFECTIVE_BALANCE * random_byte:
+//	          return candidate_index
+//	      i += 1
 func ComputeProposerIndex(bState state.ReadOnlyValidators, activeIndices []types.ValidatorIndex, seed [32]byte) (types.ValidatorIndex, error) {
 	length := uint64(len(activeIndices))
 	if length == 0 {
@@ -324,14 +331,15 @@ func ComputeProposerIndex(bState state.ReadOnlyValidators, activeIndices []types
 // be placed into the activation queue.
 //
 // Spec pseudocode definition:
-//  def is_eligible_for_activation_queue(validator: Validator) -> bool:
-//    """
-//    Check if ``validator`` is eligible to be placed into the activation queue.
-//    """
-//    return (
-//        validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH
-//        and validator.effective_balance == MAX_EFFECTIVE_BALANCE
-//    )
+//
+//	def is_eligible_for_activation_queue(validator: Validator) -> bool:
+//	  """
+//	  Check if ``validator`` is eligible to be placed into the activation queue.
+//	  """
+//	  return (
+//	      validator.activation_eligibility_epoch == FAR_FUTURE_EPOCH
+//	      and validator.effective_balance == MAX_EFFECTIVE_BALANCE
+//	  )
 func IsEligibleForActivationQueue(validator *ethpb.Validator) bool {
 	return isEligibileForActivationQueue(validator.ActivationEligibilityEpoch, validator.EffectiveBalance)
 }
@@ -351,16 +359,17 @@ func isEligibileForActivationQueue(activationEligibilityEpoch types.Epoch, effec
 // IsEligibleForActivation checks if the validator is eligible for activation.
 //
 // Spec pseudocode definition:
-//  def is_eligible_for_activation(state: BeaconState, validator: Validator) -> bool:
-//    """
-//    Check if ``validator`` is eligible for activation.
-//    """
-//    return (
-//        # Placement in queue is finalized
-//        validator.activation_eligibility_epoch <= state.finalized_checkpoint.epoch
-//        # Has not yet been activated
-//        and validator.activation_epoch == FAR_FUTURE_EPOCH
-//    )
+//
+//	def is_eligible_for_activation(state: BeaconState, validator: Validator) -> bool:
+//	  """
+//	  Check if ``validator`` is eligible for activation.
+//	  """
+//	  return (
+//	      # Placement in queue is finalized
+//	      validator.activation_eligibility_epoch <= state.finalized_checkpoint.epoch
+//	      # Has not yet been activated
+//	      and validator.activation_epoch == FAR_FUTURE_EPOCH
+//	  )
 func IsEligibleForActivation(state state.ReadOnlyCheckpoint, validator *ethpb.Validator) bool {
 	finalizedEpoch := state.FinalizedCheckpointEpoch()
 	return isEligibleForActivation(validator.ActivationEligibilityEpoch, validator.ActivationEpoch, finalizedEpoch)
--- a/beacon-chain/core/helpers/weak_subjectivity.go
+++ b/beacon-chain/core/helpers/weak_subjectivity.go
@@ -25,36 +25,37 @@ import (
 // https://github.com/ethereum/consensus-specs/blob/master/specs/phase0/weak-subjectivity.md#calculating-the-weak-subjectivity-period
 //
 // def compute_weak_subjectivity_period(state: BeaconState) -> uint64:
-//    """
-//    Returns the weak subjectivity period for the current ``state``.
-//    This computation takes into account the effect of:
-//        - validator set churn (bounded by ``get_validator_churn_limit()`` per epoch), and
-//        - validator balance top-ups (bounded by ``MAX_DEPOSITS * SLOTS_PER_EPOCH`` per epoch).
-//    A detailed calculation can be found at:
-//    https://github.com/runtimeverification/beacon-chain-verification/blob/master/weak-subjectivity/weak-subjectivity-analysis.pdf
-//    """
-//    ws_period = MIN_VALIDATOR_WITHDRAWABILITY_DELAY
-//    N = len(get_active_validator_indices(state, get_current_epoch(state)))
-//    t = get_total_active_balance(state) // N // ETH_TO_GWEI
-//    T = MAX_EFFECTIVE_BALANCE // ETH_TO_GWEI
-//    delta = get_validator_churn_limit(state)
-//    Delta = MAX_DEPOSITS * SLOTS_PER_EPOCH
-//    D = SAFETY_DECAY
 //
-//    if T * (200 + 3 * D) < t * (200 + 12 * D):
-//        epochs_for_validator_set_churn = (
-//            N * (t * (200 + 12 * D) - T * (200 + 3 * D)) // (600 * delta * (2 * t + T))
-//        )
-//        epochs_for_balance_top_ups = (
-//            N * (200 + 3 * D) // (600 * Delta)
-//        )
-//        ws_period += max(epochs_for_validator_set_churn, epochs_for_balance_top_ups)
-//    else:
-//        ws_period += (
-//            3 * N * D * t // (200 * Delta * (T - t))
-//        )
+//	"""
+//	Returns the weak subjectivity period for the current ``state``.
+//	This computation takes into account the effect of:
+//	    - validator set churn (bounded by ``get_validator_churn_limit()`` per epoch), and
+//	    - validator balance top-ups (bounded by ``MAX_DEPOSITS * SLOTS_PER_EPOCH`` per epoch).
+//	A detailed calculation can be found at:
+//	https://github.com/runtimeverification/beacon-chain-verification/blob/master/weak-subjectivity/weak-subjectivity-analysis.pdf
+//	"""
+//	ws_period = MIN_VALIDATOR_WITHDRAWABILITY_DELAY
+//	N = len(get_active_validator_indices(state, get_current_epoch(state)))
+//	t = get_total_active_balance(state) // N // ETH_TO_GWEI
+//	T = MAX_EFFECTIVE_BALANCE // ETH_TO_GWEI
+//	delta = get_validator_churn_limit(state)
+//	Delta = MAX_DEPOSITS * SLOTS_PER_EPOCH
+//	D = SAFETY_DECAY
 //
-//    return ws_period
+//	if T * (200 + 3 * D) < t * (200 + 12 * D):
+//	    epochs_for_validator_set_churn = (
+//	        N * (t * (200 + 12 * D) - T * (200 + 3 * D)) // (600 * delta * (2 * t + T))
+//	    )
+//	    epochs_for_balance_top_ups = (
+//	        N * (200 + 3 * D) // (600 * Delta)
+//	    )
+//	    ws_period += max(epochs_for_validator_set_churn, epochs_for_balance_top_ups)
+//	else:
+//	    ws_period += (
+//	        3 * N * D * t // (200 * Delta * (T - t))
+//	    )
+//
+//	return ws_period
 func ComputeWeakSubjectivityPeriod(ctx context.Context, st state.ReadOnlyBeaconState, cfg *params.BeaconChainConfig) (types.Epoch, error) {
 	// Weak subjectivity period cannot be smaller than withdrawal delay.
 	wsp := uint64(cfg.MinValidatorWithdrawabilityDelay)
@@ -114,14 +115,15 @@ func ComputeWeakSubjectivityPeriod(ctx context.Context, st state.ReadOnlyBeaconS
 // https://github.com/ethereum/consensus-specs/blob/master/specs/phase0/weak-subjectivity.md#checking-for-stale-weak-subjectivity-checkpoint
 //
 // def is_within_weak_subjectivity_period(store: Store, ws_state: BeaconState, ws_checkpoint: Checkpoint) -> bool:
-//    # Clients may choose to validate the input state against the input Weak Subjectivity Checkpoint
-//    assert ws_state.latest_block_header.state_root == ws_checkpoint.root
-//    assert compute_epoch_at_slot(ws_state.slot) == ws_checkpoint.epoch
 //
-//    ws_period = compute_weak_subjectivity_period(ws_state)
-//    ws_state_epoch = compute_epoch_at_slot(ws_state.slot)
-//    current_epoch = compute_epoch_at_slot(get_current_slot(store))
-//    return current_epoch <= ws_state_epoch + ws_period
+//	# Clients may choose to validate the input state against the input Weak Subjectivity Checkpoint
+//	assert ws_state.latest_block_header.state_root == ws_checkpoint.root
+//	assert compute_epoch_at_slot(ws_state.slot) == ws_checkpoint.epoch
+//
+//	ws_period = compute_weak_subjectivity_period(ws_state)
+//	ws_state_epoch = compute_epoch_at_slot(ws_state.slot)
+//	current_epoch = compute_epoch_at_slot(get_current_slot(store))
+//	return current_epoch <= ws_state_epoch + ws_period
 func IsWithinWeakSubjectivityPeriod(
 	ctx context.Context, currentEpoch types.Epoch, wsState state.ReadOnlyBeaconState, wsStateRoot [fieldparams.RootLength]byte, wsEpoch types.Epoch, cfg *params.BeaconChainConfig) (bool, error) {
 	// Make sure that incoming objects are not nil.
--- a/beacon-chain/core/signing/domain.go
+++ b/beacon-chain/core/signing/domain.go
@@ -10,13 +10,14 @@ import (
 // Domain returns the domain version for BLS private key to sign and verify.
 //
 // Spec pseudocode definition:
-//  def get_domain(state: BeaconState, domain_type: DomainType, epoch: Epoch=None) -> Domain:
-//    """
-//    Return the signature domain (fork version concatenated with domain type) of a message.
-//    """
-//    epoch = get_current_epoch(state) if epoch is None else epoch
-//    fork_version = state.fork.previous_version if epoch < state.fork.epoch else state.fork.current_version
-//    return compute_domain(domain_type, fork_version, state.genesis_validators_root)
+//
+//	def get_domain(state: BeaconState, domain_type: DomainType, epoch: Epoch=None) -> Domain:
+//	  """
+//	  Return the signature domain (fork version concatenated with domain type) of a message.
+//	  """
+//	  epoch = get_current_epoch(state) if epoch is None else epoch
+//	  fork_version = state.fork.previous_version if epoch < state.fork.epoch else state.fork.current_version
+//	  return compute_domain(domain_type, fork_version, state.genesis_validators_root)
 func Domain(fork *eth.Fork, epoch types.Epoch, domainType [bls.DomainByteLength]byte, genesisRoot []byte) ([]byte, error) {
 	if fork == nil {
 		return []byte{}, errors.New("nil fork or domain type")
--- a/beacon-chain/core/signing/signing_root.go
+++ b/beacon-chain/core/signing/signing_root.go
@@ -21,6 +21,32 @@ const DomainByteLength = 4
 // failed to verify.
 var ErrSigFailedToVerify = errors.New("signature did not verify")

+// List of descriptions for different kinds of signatures
+const (
+	// UnknownSignature represents all signatures other than below types
+	UnknownSignature string = "unknown signature"
+	// BlockSignature represents the block signature from block proposer
+	BlockSignature = "block signature"
+	// RandaoSignature represents randao specific signature
+	RandaoSignature = "randao signature"
+	// SelectionProof represents selection proof
+	SelectionProof = "selection proof"
+	// AggregatorSignature represents aggregator's signature
+	AggregatorSignature = "aggregator signature"
+	// AttestationSignature represents aggregated attestation signature
+	AttestationSignature = "attestation signature"
+	// BlsChangeSignature represents signature to BLSToExecutionChange
+	BlsChangeSignature = "blschange signature"
+	// SyncCommitteeSignature represents sync committee signature
+	SyncCommitteeSignature = "sync committee signature"
+	// SyncSelectionProof represents sync committee selection proof
+	SyncSelectionProof = "sync selection proof"
+	// ContributionSignature represents sync committee contributor's signature
+	ContributionSignature = "sync committee contribution signature"
+	// SyncAggregateSignature represents sync committee aggregator's signature
+	SyncAggregateSignature = "sync committee aggregator signature"
+)
+
 // ComputeDomainAndSign computes the domain and signing root and sign it using the passed in private key.
 func ComputeDomainAndSign(st state.ReadOnlyBeaconState, epoch types.Epoch, obj fssz.HashRoot, domain [4]byte, key bls.SecretKey) ([]byte, error) {
 	d, err := Domain(st.Fork(), epoch, domain, st.GenesisValidatorsRoot())
@@ -37,21 +63,22 @@ func ComputeDomainAndSign(st state.ReadOnlyBeaconState, epoch types.Epoch, obj f
 // ComputeSigningRoot computes the root of the object by calculating the hash tree root of the signing data with the given domain.
 //
 // Spec pseudocode definition:
-//	def compute_signing_root(ssz_object: SSZObject, domain: Domain) -> Root:
-//    """
-//    Return the signing root for the corresponding signing data.
-//    """
-//    return hash_tree_root(SigningData(
-//        object_root=hash_tree_root(ssz_object),
-//        domain=domain,
-//    ))
+//
+//		def compute_signing_root(ssz_object: SSZObject, domain: Domain) -> Root:
+//	   """
+//	   Return the signing root for the corresponding signing data.
+//	   """
+//	   return hash_tree_root(SigningData(
+//	       object_root=hash_tree_root(ssz_object),
+//	       domain=domain,
+//	   ))
 func ComputeSigningRoot(object fssz.HashRoot, domain []byte) ([32]byte, error) {
-	return signingData(object.HashTreeRoot, domain)
+	return SigningData(object.HashTreeRoot, domain)
 }

 // Computes the signing data by utilising the provided root function and then
 // returning the signing data of the container object.
-func signingData(rootFunc func() ([32]byte, error), domain []byte) ([32]byte, error) {
+func SigningData(rootFunc func() ([32]byte, error), domain []byte) ([32]byte, error) {
 	objRoot, err := rootFunc()
 	if err != nil {
 		return [32]byte{}, err
@@ -106,7 +133,7 @@ func VerifyBlockHeaderSigningRoot(blkHdr *ethpb.BeaconBlockHeader, pub, signatur
 	if err != nil {
 		return errors.Wrap(err, "could not convert bytes to signature")
 	}
-	root, err := signingData(blkHdr.HashTreeRoot, domain)
+	root, err := SigningData(blkHdr.HashTreeRoot, domain)
 	if err != nil {
 		return errors.Wrap(err, "could not compute signing root")
 	}
@@ -145,14 +172,16 @@ func BlockSignatureBatch(pub, signature, domain []byte, rootFunc func() ([32]byt
 		return nil, errors.Wrap(err, "could not convert bytes to public key")
 	}
 	// utilize custom block hashing function
-	root, err := signingData(rootFunc, domain)
+	root, err := SigningData(rootFunc, domain)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not compute signing root")
 	}
+	desc := BlockSignature
 	return &bls.SignatureBatch{
-		Signatures: [][]byte{signature},
-		PublicKeys: []bls.PublicKey{publicKey},
-		Messages:   [][32]byte{root},
+		Signatures:   [][]byte{signature},
+		PublicKeys:   []bls.PublicKey{publicKey},
+		Messages:     [][32]byte{root},
+		Descriptions: []string{desc},
 	}, nil
 }

@@ -160,15 +189,16 @@ func BlockSignatureBatch(pub, signature, domain []byte, rootFunc func() ([32]byt
 // array as the fork version.
 //
 // def compute_domain(domain_type: DomainType, fork_version: Version=None, genesis_validators_root: Root=None) -> Domain:
-//    """
-//    Return the domain for the ``domain_type`` and ``fork_version``.
-//    """
-//    if fork_version is None:
-//        fork_version = GENESIS_FORK_VERSION
-//    if genesis_validators_root is None:
-//        genesis_validators_root = Root()  # all bytes zero by default
-//    fork_data_root = compute_fork_data_root(fork_version, genesis_validators_root)
-//    return Domain(domain_type + fork_data_root[:28])
+//
+//	"""
+//	Return the domain for the ``domain_type`` and ``fork_version``.
+//	"""
+//	if fork_version is None:
+//	    fork_version = GENESIS_FORK_VERSION
+//	if genesis_validators_root is None:
+//	    genesis_validators_root = Root()  # all bytes zero by default
+//	fork_data_root = compute_fork_data_root(fork_version, genesis_validators_root)
+//	return Domain(domain_type + fork_data_root[:28])
 func ComputeDomain(domainType [DomainByteLength]byte, forkVersion, genesisValidatorsRoot []byte) ([]byte, error) {
 	if forkVersion == nil {
 		forkVersion = params.BeaconConfig().GenesisForkVersion
@@ -176,7 +206,7 @@ func ComputeDomain(domainType [DomainByteLength]byte, forkVersion, genesisValida
 	if genesisValidatorsRoot == nil {
 		genesisValidatorsRoot = params.BeaconConfig().ZeroHash[:]
 	}
-	forkBytes := [ForkVersionByteLength]byte{}
+	var forkBytes [ForkVersionByteLength]byte
 	copy(forkBytes[:], forkVersion)

 	forkDataRoot, err := computeForkDataRoot(forkBytes[:], genesisValidatorsRoot)
@@ -195,19 +225,20 @@ func domain(domainType [DomainByteLength]byte, forkDataRoot []byte) []byte {
 	return b
 }

-// this returns the 32byte fork data root for the ``current_version`` and ``genesis_validators_root``.
+// this returns the 32byte fork data root for the “current_version“ and “genesis_validators_root“.
 // This is used primarily in signature domains to avoid collisions across forks/chains.
 //
 // Spec pseudocode definition:
-//	def compute_fork_data_root(current_version: Version, genesis_validators_root: Root) -> Root:
-//    """
-//    Return the 32-byte fork data root for the ``current_version`` and ``genesis_validators_root``.
-//    This is used primarily in signature domains to avoid collisions across forks/chains.
-//    """
-//    return hash_tree_root(ForkData(
-//        current_version=current_version,
-//        genesis_validators_root=genesis_validators_root,
-//    ))
+//
+//		def compute_fork_data_root(current_version: Version, genesis_validators_root: Root) -> Root:
+//	   """
+//	   Return the 32-byte fork data root for the ``current_version`` and ``genesis_validators_root``.
+//	   This is used primarily in signature domains to avoid collisions across forks/chains.
+//	   """
+//	   return hash_tree_root(ForkData(
+//	       current_version=current_version,
+//	       genesis_validators_root=genesis_validators_root,
+//	   ))
 func computeForkDataRoot(version, root []byte) ([32]byte, error) {
 	r, err := (&ethpb.ForkData{
 		CurrentVersion:        version,
@@ -222,13 +253,14 @@ func computeForkDataRoot(version, root []byte) ([32]byte, error) {
 // ComputeForkDigest returns the fork for the current version and genesis validators root
 //
 // Spec pseudocode definition:
-//	def compute_fork_digest(current_version: Version, genesis_validators_root: Root) -> ForkDigest:
-//    """
-//    Return the 4-byte fork digest for the ``current_version`` and ``genesis_validators_root``.
-//    This is a digest primarily used for domain separation on the p2p layer.
-//    4-bytes suffices for practical separation of forks/chains.
-//    """
-//    return ForkDigest(compute_fork_data_root(current_version, genesis_validators_root)[:4])
+//
+//		def compute_fork_digest(current_version: Version, genesis_validators_root: Root) -> ForkDigest:
+//	   """
+//	   Return the 4-byte fork digest for the ``current_version`` and ``genesis_validators_root``.
+//	   This is a digest primarily used for domain separation on the p2p layer.
+//	   4-bytes suffices for practical separation of forks/chains.
+//	   """
+//	   return ForkDigest(compute_fork_data_root(current_version, genesis_validators_root)[:4])
 func ComputeForkDigest(version, genesisValidatorsRoot []byte) ([4]byte, error) {
 	dataRoot, err := computeForkDataRoot(version, genesisValidatorsRoot)
 	if err != nil {
--- a/Show More
+++ b/Show More