fix forkchoice endpoint

2026-01-11 06:18:05 -05:00 · 2022-09-05 11:31:04 -03:00
1655 changed files with 44787 additions and 79251 deletions
--- a/.bazelrc
+++ b/.bazelrc
@@ -13,6 +13,7 @@ coverage --define=coverage_enabled=1

 # Fix for rules_docker. See: https://github.com/bazelbuild/rules_docker/issues/842
 build --host_force_python=PY2
+test --host_force_python=PY2
 run --host_force_python=PY2

 # Networking is blocked for tests by default, add "requires-network" tag to your test if networking
@@ -21,12 +22,15 @@ 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
+test --incompatible_strict_action_env
 run --incompatible_strict_action_env

 build --define blst_disabled=false
+test --define blst_disabled=false
 run --define blst_disabled=false

 build:blst_disabled --define blst_disabled=true
@@ -37,7 +41,7 @@ build:minimal --@io_bazel_rules_go//go/config:tags=minimal

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

 # LLVM compiler for building C/C++ dependencies.
 build:llvm --define compiler=llvm
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-5.3.0
+5.0.0
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -5,4 +5,12 @@
 *.bzl @prestonvanloon

 # Anyone on prylabs team can approve dependency updates.
-deps.bzl @prysmaticlabs/core-team
+deps.bzl @prysmaticlabs/core-team
+
+# Radek and Nishant are responsible for changes that can affect the native state feature.
+# See https://www.notion.so/prysmaticlabs/Native-Beacon-State-Redesign-6cc9744b4ec1439bb34fa829b36a35c1
+/beacon-chain/state/fieldtrie/ @rkapka @nisdas @rauljordan
+/beacon-chain/state/v1/ @rkapka @nisdas @rauljordan
+/beacon-chain/state/v2/ @rkapka @nisdas @rauljordan
+/beacon-chain/state/v3/ @rkapka @nisdas @rauljordan
+/beacon-chain/state/state-native/ @rkapka @nisdas @rauljordan
--- 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 1.19
+      - name: Set up Go 1.18
        uses: actions/setup-go@v3
        with:
-          go-version: 1.19
+          go-version: 1.18
      - 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 1.19
+      - name: Set up Go 1.18
        uses: actions/setup-go@v3
        with:
-          go-version: 1.19
+          go-version: 1.18
          id: go

      - name: Golangci-lint
        uses: golangci/golangci-lint-action@v3
        with:
-          version: v1.50.1
+          version: v1.47.2
          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: 1.19
+          go-version: 1.18
        id: go

      - name: Check out code into the Go module directory
--- a/.gitignore
+++ b/.gitignore
@@ -38,6 +38,3 @@ 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: '1.19'
+  go: '1.18'

 linters:
  disable-all: true
--- a/DEPENDENCIES.md
+++ b/DEPENDENCIES.md
@@ -1,4 +1,4 @@
-# Dependency Management in Prysm
+# Dependency Managagement 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. Furthermore, Prysm
+the following scripts often to ensure their generated files are up to date. Further more, Prysm
 generates SSZ marshal related code based on defined data structures. These generated files must
 also be updated and checked in as frequently.

--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@

 [![Build status](https://badge.buildkite.com/b555891daf3614bae4284dcf365b2340cefc0089839526f096.svg?branch=master)](https://buildkite.com/prysmatic-labs/prysm)
 [![Go Report Card](https://goreportcard.com/badge/github.com/prysmaticlabs/prysm)](https://goreportcard.com/report/github.com/prysmaticlabs/prysm)
-[![Consensus_Spec_Version 1.2.0](https://img.shields.io/badge/Consensus%20Spec%20Version-v1.2.0-blue.svg)](https://github.com/ethereum/consensus-specs/tree/v1.2.0)
+[![Consensus_Spec_Version 1.2.0-rc.3](https://img.shields.io/badge/Consensus%20Spec%20Version-v1.2.0.rc.3-blue.svg)](https://github.com/ethereum/consensus-specs/tree/v1.2.0-rc.3)
 [![Execution_API_Version 1.0.0-beta.1](https://img.shields.io/badge/Execution%20API%20Version-v1.0.0.beta.1-blue.svg)](https://github.com/ethereum/execution-apis/tree/v1.0.0-beta.1/src/engine)
 [![Discord](https://user-images.githubusercontent.com/7288322/34471967-1df7808a-efbb-11e7-9088-ed0b04151291.png)](https://discord.gg/CTYGPUJ)
 [![GitPOAP Badge](https://public-api.gitpoap.io/v1/repo/prysmaticlabs/prysm/badge)](https://www.gitpoap.io/gh/prysmaticlabs/prysm)
--- a/49
+++ b/49
@@ -88,10 +88,10 @@ http_archive(
        # Expose internals of go_test for custom build transitions.
        "//third_party:io_bazel_rules_go_test.patch",
    ],
-    sha256 = "ae013bf35bd23234d1dea46b079f1e05ba74ac0321423830119d3e787ec73483",
+    sha256 = "16e9fca53ed6bd4ff4ad76facc9b7b651a89db1689a2877d6fd7b82aa824e366",
    urls = [
-        "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",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.34.0/rules_go-v0.34.0.zip",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.34.0/rules_go-v0.34.0.zip",
    ],
 )

@@ -110,6 +110,13 @@ 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",
@@ -157,15 +164,35 @@ 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 = "1.19.4",
+    go_version = "1.18.5",
    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",
@@ -188,7 +215,7 @@ filegroup(
    url = "https://github.com/eth-clients/slashing-protection-interchange-tests/archive/b8413ca42dc92308019d0d4db52c87e9e125c4e9.tar.gz",
 )

-consensus_spec_version = "v1.3.0-rc.1"
+consensus_spec_version = "v1.2.0-rc.3"

 bls_test_version = "v0.1.1"

@@ -204,7 +231,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "3d6fadb64674eb64a84fae6c2efa9949231ea91e7cb74ada9214097323e86569",
+    sha256 = "18ca21497f41042cdbe60e2333b100d218b2994fb514964b9deb23daf615a12f",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/general.tar.gz" % consensus_spec_version,
 )

@@ -220,7 +247,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "54ffbcab1e77316a280e6f5a64c6ed62351e8f5678e6fa49340e49b9b5575e8e",
+    sha256 = "47b8f6fabe39b4a69f13054ba74e26ab51581ddbd359c18cf0f03317474e299c",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/minimal.tar.gz" % consensus_spec_version,
 )

@@ -236,7 +263,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "bb06d30ca533dc97d45f2367916ba9ff1b5af52f08a9d8c33bb7b1a61254094e",
+    sha256 = "a061efc05429b169393c32dc2633a948269461b0fe681f11d41e170a880dcc71",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/mainnet.tar.gz" % consensus_spec_version,
 )

@@ -251,7 +278,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "9d22246c00ec3907ef8dc3ddccdfe6f7153ce46df73deee0a0176fe7e4aa1126",
+    sha256 = "753d51c6a6cc6df101c897e4bea77f73b271f50aeda74440f412514d4bd88a86",
    strip_prefix = "consensus-specs-" + consensus_spec_version[1:],
    url = "https://github.com/ethereum/consensus-specs/archive/refs/tags/%s.tar.gz" % consensus_spec_version,
 )
@@ -315,9 +342,9 @@ filegroup(
    visibility = ["//visibility:public"],
 )
 """,
-    sha256 = "b2226874526805d64c29e5053fa28e511b57c0860585d6d59777ee81ff4859ca",
+    sha256 = "e0c0b5dc609b3a221e74c720f483c595441f2ad5e38bb8aa3522636039945a6f",
    urls = [
-        "https://github.com/prysmaticlabs/prysm-web-ui/releases/download/v2.0.2/prysm-web-ui.tar.gz",
+        "https://github.com/prysmaticlabs/prysm-web-ui/releases/download/v2.0.1/prysm-web-ui.tar.gz",
    ],
 )

--- a/api/client/beacon/checkpoint.go
+++ b/api/client/beacon/checkpoint.go
@@ -9,7 +9,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/ssz/detect"
 	"github.com/prysmaticlabs/prysm/v3/io/file"
 	"github.com/prysmaticlabs/prysm/v3/runtime/version"
@@ -54,7 +54,7 @@ func (o *OriginData) BlockBytes() []byte {
 	return o.bb
 }

-func fname(prefix string, vu *detect.VersionedUnmarshaler, slot primitives.Slot, root [32]byte) string {
+func fname(prefix string, vu *detect.VersionedUnmarshaler, slot types.Slot, root [32]byte) string {
 	return fmt.Sprintf("%s_%s_%s_%d-%#x.ssz", prefix, vu.Config.ConfigName, version.String(vu.Fork), slot, root)
 }

@@ -74,9 +74,6 @@ func DownloadFinalizedData(ctx context.Context, client *Client) (*OriginData, er
 	if err != nil {
 		return nil, errors.Wrap(err, "error unmarshaling finalized state to correct version")
 	}
-	if s.Slot() != s.LatestBlockHeader().Slot {
-		return nil, fmt.Errorf("finalized state slot does not match latest block header slot %d != %d", s.Slot(), s.LatestBlockHeader().Slot)
-	}

 	sr, err := s.HashTreeRoot(ctx)
 	if err != nil {
@@ -122,7 +119,7 @@ func DownloadFinalizedData(ctx context.Context, client *Client) (*OriginData, er
 type WeakSubjectivityData struct {
 	BlockRoot [32]byte
 	StateRoot [32]byte
-	Epoch     primitives.Epoch
+	Epoch     types.Epoch
 }

 // CheckpointString returns the standard string representation of a Checkpoint.
@@ -238,7 +235,7 @@ func computeBackwardsCompatible(ctx context.Context, client *Client) (*WeakSubje

 // this method downloads the head state, which can be used to find the correct chain config
 // and use prysm's helper methods to compute the latest weak subjectivity epoch.
-func getWeakSubjectivityEpochFromHead(ctx context.Context, client *Client) (primitives.Epoch, error) {
+func getWeakSubjectivityEpochFromHead(ctx context.Context, client *Client) (types.Epoch, error) {
 	headBytes, err := client.GetState(ctx, IdHead)
 	if err != nil {
 		return 0, err
--- a/api/client/beacon/checkpoint_test.go
+++ b/api/client/beacon/checkpoint_test.go
@@ -19,7 +19,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/time/slots"

 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/ssz/detect"
 	"github.com/prysmaticlabs/prysm/v3/runtime/version"

@@ -102,7 +102,7 @@ func TestFname(t *testing.T) {
 		Config: params.MainnetConfig(),
 		Fork:   version.Phase0,
 	}
-	slot := primitives.Slot(23)
+	slot := types.Slot(23)
 	prefix := "block"
 	var root [32]byte
 	copy(root[:], []byte{0x23, 0x23, 0x23})
@@ -335,7 +335,7 @@ func TestGetWeakSubjectivityEpochFromHead(t *testing.T) {
 	require.Equal(t, expectedEpoch, actualEpoch)
 }

-func forkForEpoch(cfg *params.BeaconChainConfig, epoch primitives.Epoch) (*ethpb.Fork, error) {
+func forkForEpoch(cfg *params.BeaconChainConfig, epoch types.Epoch) (*ethpb.Fork, error) {
 	os := forks.NewOrderedSchedule(cfg)
 	currentVersion, err := os.VersionForEpoch(epoch)
 	if err != nil {
@@ -357,7 +357,7 @@ func forkForEpoch(cfg *params.BeaconChainConfig, epoch primitives.Epoch) (*ethpb
 	}, nil
 }

-func defaultTestHeadState(t *testing.T, cfg *params.BeaconChainConfig) (state.BeaconState, primitives.Epoch) {
+func defaultTestHeadState(t *testing.T, cfg *params.BeaconChainConfig) (state.BeaconState, types.Epoch) {
 	st, err := util.NewBeaconStateAltair()
 	require.NoError(t, err)

@@ -418,7 +418,6 @@ func TestDownloadFinalizedData(t *testing.T) {
 	require.NoError(t, err)
 	fork, err := forkForEpoch(cfg, epoch)
 	require.NoError(t, st.SetFork(fork))
-	require.NoError(t, st.SetSlot(slot))

 	// set up checkpoint block
 	b, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
--- a/api/client/beacon/client.go
+++ b/api/client/beacon/client.go
@@ -21,21 +21,20 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/rpc/apimiddleware"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	log "github.com/sirupsen/logrus"
 )

 const (
-	getSignedBlockPath       = "/eth/v2/beacon/blocks"
-	getBlockRootPath         = "/eth/v1/beacon/blocks/{{.Id}}/root"
-	getForkForStatePath      = "/eth/v1/beacon/states/{{.Id}}/fork"
-	getWeakSubjectivityPath  = "/eth/v1/beacon/weak_subjectivity"
-	getForkSchedulePath      = "/eth/v1/config/fork_schedule"
-	getStatePath             = "/eth/v2/debug/beacon/states"
-	getNodeVersionPath       = "/eth/v1/node/version"
-	changeBLStoExecutionPath = "/eth/v1/beacon/pool/bls_to_execution_changes"
+	getSignedBlockPath      = "/eth/v2/beacon/blocks"
+	getBlockRootPath        = "/eth/v1/beacon/blocks/{{.Id}}/root"
+	getForkForStatePath     = "/eth/v1/beacon/states/{{.Id}}/fork"
+	getWeakSubjectivityPath = "/eth/v1/beacon/weak_subjectivity"
+	getForkSchedulePath     = "/eth/v1/config/fork_schedule"
+	getStatePath            = "/eth/v2/debug/beacon/states"
+	getNodeVersionPath      = "/eth/v1/node/version"
 )

 // StateOrBlockId represents the block_id / state_id parameters that several of the Eth Beacon API methods accept.
@@ -62,7 +61,7 @@ func IdFromRoot(r [32]byte) StateOrBlockId {

 // IdFromSlot encodes a Slot in the format expected by the API in places where a slot can be used to identify
 // a BeaconState or SignedBeaconBlock.
-func IdFromSlot(s primitives.Slot) StateOrBlockId {
+func IdFromSlot(s types.Slot) StateOrBlockId {
 	return StateOrBlockId(strconv.FormatUint(uint64(s), 10))
 }

@@ -147,6 +146,7 @@ func withSSZEncoding() reqOption {
 // get is a generic, opinionated GET function to reduce boilerplate amongst the getters in this package.
 func (c *Client) get(ctx context.Context, path string, opts ...reqOption) ([]byte, error) {
 	u := c.baseURL.ResolveReference(&url.URL{Path: path})
+	log.Printf("requesting %s", u.String())
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
 		return nil, err
@@ -337,66 +337,12 @@ func (c *Client) GetWeakSubjectivity(ctx context.Context) (*WeakSubjectivityData
 		return nil, err
 	}
 	return &WeakSubjectivityData{
-		Epoch:     primitives.Epoch(epoch),
+		Epoch:     types.Epoch(epoch),
 		BlockRoot: bytesutil.ToBytes32(blockRoot),
 		StateRoot: bytesutil.ToBytes32(stateRoot),
 	}, nil
 }

-// SubmitChangeBLStoExecution calls a beacon API endpoint to set the withdrawal addresses based on the given signed messages.
-// If the API responds with something other than OK there will be failure messages associated to the corresponding request message.
-func (c *Client) SubmitChangeBLStoExecution(ctx context.Context, request []*apimiddleware.SignedBLSToExecutionChangeJson) error {
-	u := c.baseURL.ResolveReference(&url.URL{Path: changeBLStoExecutionPath})
-	body, err := json.Marshal(request)
-	if err != nil {
-		return errors.Wrap(err, "failed to marshal JSON")
-	}
-	req, err := http.NewRequestWithContext(ctx, http.MethodPost, u.String(), bytes.NewBuffer(body))
-	if err != nil {
-		return errors.Wrap(err, "invalid format, failed to create new POST request object")
-	}
-	req.Header.Set("Content-Type", "application/json")
-	resp, err := c.hc.Do(req)
-	if err != nil {
-		return err
-	}
-	defer func() {
-		err = resp.Body.Close()
-	}()
-	if resp.StatusCode != http.StatusOK {
-		decoder := json.NewDecoder(resp.Body)
-		decoder.DisallowUnknownFields()
-		errorJson := &apimiddleware.IndexedVerificationFailureErrorJson{}
-		if err := decoder.Decode(errorJson); err != nil {
-			return errors.Wrapf(err, "failed to decode error JSON for %s", resp.Request.URL)
-		}
-		for _, failure := range errorJson.Failures {
-			w := request[failure.Index].Message
-			log.WithFields(log.Fields{
-				"validator_index":    w.ValidatorIndex,
-				"withdrawal_address": w.ToExecutionAddress,
-			}).Error(failure.Message)
-		}
-		return errors.Errorf("POST error %d: %s", errorJson.Code, errorJson.Message)
-	}
-	return nil
-}
-
-// GetBLStoExecutionChanges gets all the set withdrawal messages in the node's operation pool.
-// Returns a struct representation of json response.
-func (c *Client) GetBLStoExecutionChanges(ctx context.Context) (*apimiddleware.BLSToExecutionChangesPoolResponseJson, error) {
-	body, err := c.get(ctx, changeBLStoExecutionPath)
-	if err != nil {
-		return nil, err
-	}
-	poolResponse := &apimiddleware.BLSToExecutionChangesPoolResponseJson{}
-	err = json.Unmarshal(body, poolResponse)
-	if err != nil {
-		return nil, err
-	}
-	return poolResponse, nil
-}
-
 func non200Err(response *http.Response) error {
 	bodyBytes, err := io.ReadAll(response.Body)
 	var body string
@@ -442,7 +388,7 @@ func (f *forkResponse) Fork() (*ethpb.Fork, error) {
 	return &ethpb.Fork{
 		CurrentVersion:  cSlice,
 		PreviousVersion: pSlice,
-		Epoch:           primitives.Epoch(epoch),
+		Epoch:           types.Epoch(epoch),
 	}, nil
 }

@@ -467,7 +413,7 @@ func (fsr *forkScheduleResponse) OrderedForkSchedule() (forks.OrderedSchedule, e
 		version := bytesutil.ToBytes4(vSlice)
 		ofs = append(ofs, forks.ForkScheduleEntry{
 			Version: version,
-			Epoch:   primitives.Epoch(uint64(epoch)),
+			Epoch:   types.Epoch(uint64(epoch)),
 		})
 	}
 	sort.Sort(ofs)
--- a/api/client/beacon/doc.go
+++ b/api/client/beacon/doc.go
@@ -1,5 +1,6 @@
 /*
 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/BUILD.bazel
+++ b/api/client/builder/BUILD.bazel
@@ -3,7 +3,6 @@ load("@prysm//tools/go:def.bzl", "go_library", "go_test")
 go_library(
    name = "go_default_library",
    srcs = [
-        "bid.go",
        "client.go",
        "errors.go",
        "types.go",
@@ -11,19 +10,13 @@ go_library(
    importpath = "github.com/prysmaticlabs/prysm/v3/api/client/builder",
    visibility = ["//visibility:public"],
    deps = [
-        "//consensus-types/blocks:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//monitoring/tracing:go_default_library",
-        "//network:go_default_library",
-        "//network/authorization:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
-        "//runtime/version:go_default_library",
        "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
-        "@com_github_prysmaticlabs_fastssz//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@io_opencensus_go//trace:go_default_library",
    ],
@@ -39,12 +32,10 @@ go_test(
    embed = [":go_default_library"],
    deps = [
        "//config/params:go_default_library",
-        "//consensus-types/blocks:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
-        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
        "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
        "@com_github_golang_protobuf//proto:go_default_library",
--- a/api/client/builder/bid.go
+++ b/api/client/builder/bid.go
@@ -1,190 +0,0 @@
-package builder
-
-import (
-	ssz "github.com/prysmaticlabs/fastssz"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v3/runtime/version"
-)
-
-// SignedBid is an interface describing the method set of a signed builder bid.
-type SignedBid interface {
-	Message() (Bid, error)
-	Signature() []byte
-	Version() int
-	IsNil() bool
-}
-
-// Bid is an interface describing the method set of a builder bid.
-type Bid interface {
-	Header() (interfaces.ExecutionData, error)
-	Value() []byte
-	Pubkey() []byte
-	Version() int
-	IsNil() bool
-	HashTreeRoot() ([32]byte, error)
-	HashTreeRootWith(hh *ssz.Hasher) error
-}
-
-type signedBuilderBid struct {
-	p *ethpb.SignedBuilderBid
-}
-
-// WrappedSignedBuilderBid is a constructor which wraps a protobuf signed bit into an interface.
-func WrappedSignedBuilderBid(p *ethpb.SignedBuilderBid) (SignedBid, error) {
-	w := signedBuilderBid{p: p}
-	if w.IsNil() {
-		return nil, blocks.ErrNilObjectWrapped
-	}
-	return w, nil
-}
-
-// Message --
-func (b signedBuilderBid) Message() (Bid, error) {
-	return WrappedBuilderBid(b.p.Message)
-}
-
-// Signature --
-func (b signedBuilderBid) Signature() []byte {
-	return b.p.Signature
-}
-
-// Version --
-func (b signedBuilderBid) Version() int {
-	return version.Bellatrix
-}
-
-// IsNil --
-func (b signedBuilderBid) IsNil() bool {
-	return b.p == nil
-}
-
-type signedBuilderBidCapella struct {
-	p *ethpb.SignedBuilderBidCapella
-}
-
-// WrappedSignedBuilderBidCapella is a constructor which wraps a protobuf signed bit into an interface.
-func WrappedSignedBuilderBidCapella(p *ethpb.SignedBuilderBidCapella) (SignedBid, error) {
-	w := signedBuilderBidCapella{p: p}
-	if w.IsNil() {
-		return nil, blocks.ErrNilObjectWrapped
-	}
-	return w, nil
-}
-
-// Message --
-func (b signedBuilderBidCapella) Message() (Bid, error) {
-	return WrappedBuilderBidCapella(b.p.Message)
-}
-
-// Signature --
-func (b signedBuilderBidCapella) Signature() []byte {
-	return b.p.Signature
-}
-
-// Version --
-func (b signedBuilderBidCapella) Version() int {
-	return version.Capella
-}
-
-// IsNil --
-func (b signedBuilderBidCapella) IsNil() bool {
-	return b.p == nil
-}
-
-type builderBid struct {
-	p *ethpb.BuilderBid
-}
-
-// WrappedBuilderBid is a constructor which wraps a protobuf bid into an interface.
-func WrappedBuilderBid(p *ethpb.BuilderBid) (Bid, error) {
-	w := builderBid{p: p}
-	if w.IsNil() {
-		return nil, blocks.ErrNilObjectWrapped
-	}
-	return w, nil
-}
-
-// Header --
-func (b builderBid) Header() (interfaces.ExecutionData, error) {
-	return blocks.WrappedExecutionPayloadHeader(b.p.Header)
-}
-
-// Version --
-func (b builderBid) Version() int {
-	return version.Bellatrix
-}
-
-// Value --
-func (b builderBid) Value() []byte {
-	return b.p.Value
-}
-
-// Pubkey --
-func (b builderBid) Pubkey() []byte {
-	return b.p.Pubkey
-}
-
-// IsNil --
-func (b builderBid) IsNil() bool {
-	return b.p == nil
-}
-
-// HashTreeRoot --
-func (b builderBid) HashTreeRoot() ([32]byte, error) {
-	return b.p.HashTreeRoot()
-}
-
-// HashTreeRootWith --
-func (b builderBid) HashTreeRootWith(hh *ssz.Hasher) error {
-	return b.p.HashTreeRootWith(hh)
-}
-
-type builderBidCapella struct {
-	p *ethpb.BuilderBidCapella
-}
-
-// WrappedBuilderBidCapella is a constructor which wraps a protobuf bid into an interface.
-func WrappedBuilderBidCapella(p *ethpb.BuilderBidCapella) (Bid, error) {
-	w := builderBidCapella{p: p}
-	if w.IsNil() {
-		return nil, blocks.ErrNilObjectWrapped
-	}
-	return w, nil
-}
-
-// Header --
-func (b builderBidCapella) Header() (interfaces.ExecutionData, error) {
-	return blocks.WrappedExecutionPayloadHeaderCapella(b.p.Header)
-}
-
-// Version --
-func (b builderBidCapella) Version() int {
-	return version.Capella
-}
-
-// Value --
-func (b builderBidCapella) Value() []byte {
-	return b.p.Value
-}
-
-// Pubkey --
-func (b builderBidCapella) Pubkey() []byte {
-	return b.p.Pubkey
-}
-
-// IsNil --
-func (b builderBidCapella) IsNil() bool {
-	return b.p == nil
-}
-
-// HashTreeRoot --
-func (b builderBidCapella) HashTreeRoot() ([32]byte, error) {
-	return b.p.HashTreeRoot()
-}
-
-// HashTreeRootWith --
-func (b builderBidCapella) HashTreeRootWith(hh *ssz.Hasher) error {
-	return b.p.HashTreeRootWith(hh)
-}
--- a/api/client/builder/client.go
+++ b/api/client/builder/client.go
@@ -9,20 +9,14 @@ import (
 	"net"
 	"net/http"
 	"net/url"
-	"strings"
 	"text/template"
 	"time"

 	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/monitoring/tracing"
-	"github.com/prysmaticlabs/prysm/v3/network"
-	"github.com/prysmaticlabs/prysm/v3/network/authorization"
 	v1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v3/runtime/version"
 	log "github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
 )
@@ -36,12 +30,17 @@ const (

 var errMalformedHostname = errors.New("hostname must include port, separated by one colon, like example.com:3500")
 var errMalformedRequest = errors.New("required request data are missing")
-var errNotBlinded = errors.New("submitted block is not blinded")
-var submitBlindedBlockTimeout = 3 * time.Second

 // ClientOpt is a functional option for the Client type (http.Client wrapper)
 type ClientOpt func(*Client)

+// WithTimeout sets the .Timeout attribute of the wrapped http.Client.
+func WithTimeout(timeout time.Duration) ClientOpt {
+	return func(c *Client) {
+		c.hc.Timeout = timeout
+	}
+}
+
 type observer interface {
 	observe(r *http.Request) error
 }
@@ -84,15 +83,6 @@ func (*requestLogger) observe(r *http.Request) (e error) {

 var _ observer = &requestLogger{}

-// BuilderClient provides a collection of helper methods for calling Builder API endpoints.
-type BuilderClient interface {
-	NodeURL() string
-	GetHeader(ctx context.Context, slot primitives.Slot, parentHash [32]byte, pubkey [48]byte) (SignedBid, error)
-	RegisterValidator(ctx context.Context, svr []*ethpb.SignedValidatorRegistrationV1) error
-	SubmitBlindedBlock(ctx context.Context, sb interfaces.SignedBeaconBlock) (interfaces.ExecutionData, error)
-	Status(ctx context.Context) error
-}
-
 // Client provides a collection of helper methods for calling Builder API endpoints.
 type Client struct {
 	hc      *http.Client
@@ -104,8 +94,7 @@ type Client struct {
 // `host` is the base host + port used to construct request urls. This value can be
 // a URL string, or NewClient will assume an http endpoint if just `host:port` is used.
 func NewClient(host string, opts ...ClientOpt) (*Client, error) {
-	endpoint := covertEndPoint(host)
-	u, err := urlForHost(endpoint.Url)
+	u, err := urlForHost(host)
 	if err != nil {
 		return nil, err
 	}
@@ -189,9 +178,9 @@ func (c *Client) do(ctx context.Context, method string, path string, body io.Rea

 var execHeaderTemplate = template.Must(template.New("").Parse(getExecHeaderPath))

-func execHeaderPath(slot primitives.Slot, parentHash [32]byte, pubkey [48]byte) (string, error) {
+func execHeaderPath(slot types.Slot, parentHash [32]byte, pubkey [48]byte) (string, error) {
 	v := struct {
-		Slot       primitives.Slot
+		Slot       types.Slot
 		ParentHash string
 		Pubkey     string
 	}{
@@ -207,8 +196,8 @@ func execHeaderPath(slot primitives.Slot, parentHash [32]byte, pubkey [48]byte)
 	return b.String(), nil
 }

-// GetHeader is used by a proposing validator to request an execution payload header from the Builder node.
-func (c *Client) GetHeader(ctx context.Context, slot primitives.Slot, parentHash [32]byte, pubkey [48]byte) (SignedBid, error) {
+// GetHeader is used by a proposing validator to request an ExecutionPayloadHeader from the Builder node.
+func (c *Client) GetHeader(ctx context.Context, slot types.Slot, parentHash [32]byte, pubkey [48]byte) (*ethpb.SignedBuilderBid, error) {
 	path, err := execHeaderPath(slot, parentHash, pubkey)
 	if err != nil {
 		return nil, err
@@ -217,35 +206,11 @@ func (c *Client) GetHeader(ctx context.Context, slot primitives.Slot, parentHash
 	if err != nil {
 		return nil, err
 	}
-	v := &VersionResponse{}
-	if err := json.Unmarshal(hb, v); err != nil {
+	hr := &ExecHeaderResponse{}
+	if err := json.Unmarshal(hb, hr); err != nil {
 		return nil, errors.Wrapf(err, "error unmarshaling the builder GetHeader response, using slot=%d, parentHash=%#x, pubkey=%#x", slot, parentHash, pubkey)
 	}
-	switch strings.ToLower(v.Version) {
-	case strings.ToLower(version.String(version.Capella)):
-		hr := &ExecHeaderResponseCapella{}
-		if err := json.Unmarshal(hb, hr); err != nil {
-			return nil, errors.Wrapf(err, "error unmarshaling the builder GetHeader response, using slot=%d, parentHash=%#x, pubkey=%#x", slot, parentHash, pubkey)
-		}
-		p, err := hr.ToProto()
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not extract proto message from header")
-		}
-		return WrappedSignedBuilderBidCapella(p)
-	case strings.ToLower(version.String(version.Bellatrix)):
-		hr := &ExecHeaderResponse{}
-		if err := json.Unmarshal(hb, hr); err != nil {
-			return nil, errors.Wrapf(err, "error unmarshaling the builder GetHeader response, using slot=%d, parentHash=%#x, pubkey=%#x", slot, parentHash, pubkey)
-		}
-		p, err := hr.ToProto()
-		if err != nil {
-			return nil, errors.Wrap(err, "could not extract proto message from header")
-		}
-		return WrappedSignedBuilderBid(p)
-	default:
-		return nil, fmt.Errorf("unsupported header version %s", strings.ToLower(v.Version))
-	}
-
+	return hr.ToProto()
 }

 // RegisterValidator encodes the SignedValidatorRegistrationV1 message to json (including hex-encoding the byte
@@ -276,90 +241,20 @@ func (c *Client) RegisterValidator(ctx context.Context, svr []*ethpb.SignedValid
 }

 // SubmitBlindedBlock calls the builder API endpoint that binds the validator to the builder and submits the block.
-// The response is the full execution payload used to create the blinded block.
-func (c *Client) SubmitBlindedBlock(ctx context.Context, sb interfaces.SignedBeaconBlock) (interfaces.ExecutionData, error) {
-	if !sb.IsBlinded() {
-		return nil, errNotBlinded
-	}
-	switch sb.Version() {
-	case version.Bellatrix:
-		psb, err := sb.PbBlindedBellatrixBlock()
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not get protobuf block")
-		}
-		b := &SignedBlindedBeaconBlockBellatrix{SignedBlindedBeaconBlockBellatrix: psb}
-		body, err := json.Marshal(b)
-		if err != nil {
-			return nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockBellatrix value body in SubmitBlindedBlock")
-		}
-
-		ctx, cancel := context.WithTimeout(ctx, submitBlindedBlockTimeout)
-		defer cancel()
-		rb, err := c.do(ctx, http.MethodPost, postBlindedBeaconBlockPath, bytes.NewBuffer(body))
-
-		if err != nil {
-			return nil, errors.Wrap(err, "error posting the SignedBlindedBeaconBlockBellatrix to the builder api")
-		}
-		ep := &ExecPayloadResponse{}
-		if err := json.Unmarshal(rb, ep); err != nil {
-			return nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlock response")
-		}
-		p, err := ep.ToProto()
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not extract proto message from payload")
-		}
-		return blocks.WrappedExecutionPayload(p)
-	case version.Capella:
-		psb, err := sb.PbBlindedCapellaBlock()
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not get protobuf block")
-		}
-		b := &SignedBlindedBeaconBlockCapella{SignedBlindedBeaconBlockCapella: psb}
-		body, err := json.Marshal(b)
-		if err != nil {
-			return nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockCapella value body in SubmitBlindedBlockCapella")
-		}
-
-		ctx, cancel := context.WithTimeout(ctx, submitBlindedBlockTimeout)
-		defer cancel()
-		rb, err := c.do(ctx, http.MethodPost, postBlindedBeaconBlockPath, bytes.NewBuffer(body))
-
-		if err != nil {
-			return nil, errors.Wrap(err, "error posting the SignedBlindedBeaconBlockCapella to the builder api")
-		}
-		ep := &ExecPayloadResponseCapella{}
-		if err := json.Unmarshal(rb, ep); err != nil {
-			return nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlockCapella response")
-		}
-		p, err := ep.ToProto()
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not extract proto message from payload")
-		}
-		return blocks.WrappedExecutionPayloadCapella(p)
-	default:
-		return nil, fmt.Errorf("unsupported block version %s", version.String(sb.Version()))
-	}
-}
-
-// SubmitBlindedBlockCapella calls the builder API endpoint that binds the validator to the builder and submits the block.
-// The response is the full ExecutionPayloadCapella used to create the blinded block.
-func (c *Client) SubmitBlindedBlockCapella(ctx context.Context, sb *ethpb.SignedBlindedBeaconBlockCapella) (*v1.ExecutionPayloadCapella, error) {
-	v := &SignedBlindedBeaconBlockCapella{SignedBlindedBeaconBlockCapella: sb}
+// The response is the full ExecutionPayload used to create the blinded block.
+func (c *Client) SubmitBlindedBlock(ctx context.Context, sb *ethpb.SignedBlindedBeaconBlockBellatrix) (*v1.ExecutionPayload, error) {
+	v := &SignedBlindedBeaconBlockBellatrix{SignedBlindedBeaconBlockBellatrix: sb}
 	body, err := json.Marshal(v)
 	if err != nil {
-		return nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockCapella value body in SubmitBlindedBlockCapella")
+		return nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockBellatrix value body in SubmitBlindedBlock")
 	}
-
-	ctx, cancel := context.WithTimeout(ctx, submitBlindedBlockTimeout)
-	defer cancel()
 	rb, err := c.do(ctx, http.MethodPost, postBlindedBeaconBlockPath, bytes.NewBuffer(body))
-
 	if err != nil {
 		return nil, errors.Wrap(err, "error posting the SignedBlindedBeaconBlockBellatrix to the builder api")
 	}
-	ep := &ExecPayloadResponseCapella{}
+	ep := &ExecPayloadResponse{}
 	if err := json.Unmarshal(rb, ep); err != nil {
-		return nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlockCapella response")
+		return nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlock response")
 	}
 	return ep.ToProto()
 }
@@ -409,12 +304,3 @@ func non200Err(response *http.Response) error {
 		return errors.Wrap(ErrNotOK, fmt.Sprintf("unsupported error code: %d", response.StatusCode))
 	}
 }
-
-func covertEndPoint(ep string) network.Endpoint {
-	return network.Endpoint{
-		Url: ep,
-		Auth: network.AuthorizationData{ // Auth is not used for builder.
-			Method: authorization.None,
-			Value:  "",
-		}}
-}
--- a/api/client/builder/client_test.go
+++ b/api/client/builder/client_test.go
@@ -13,12 +13,10 @@ import (

 	"github.com/prysmaticlabs/go-bitfield"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
 	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	v1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	eth "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v3/testing/assert"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 )

@@ -83,7 +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"},"signature":"0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"}]`
+	expectedBody := `[{"message":{"fee_recipient":"0x0000000000000000000000000000000000000000","gas_limit":"23","timestamp":"42","pubkey":"0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"}}]`
 	expectedPath := "/eth/v1/builder/validators"
 	hc := &http.Client{
 		Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
@@ -113,7 +111,6 @@ 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}))
 }
@@ -121,192 +118,97 @@ func TestClient_RegisterValidator(t *testing.T) {
 func TestClient_GetHeader(t *testing.T) {
 	ctx := context.Background()
 	expectedPath := "/eth/v1/builder/header/23/0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2/0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"
+	hc := &http.Client{
+		Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
+			require.Equal(t, expectedPath, r.URL.Path)
+			message := ErrorMessage{
+				Code:    500,
+				Message: "Internal server error",
+			}
+			resp, err := json.Marshal(message)
+			require.NoError(t, err)
+			return &http.Response{
+				StatusCode: http.StatusInternalServerError,
+				Body:       io.NopCloser(bytes.NewBuffer(resp)),
+				Request:    r.Clone(ctx),
+			}, nil
+		}),
+	}
+	c := &Client{
+		hc:      hc,
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}
 	var slot types.Slot = 23
 	parentHash := ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
 	pubkey := ezDecode(t, "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a")
+	_, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
+	require.ErrorIs(t, err, ErrNotOK)

-	t.Run("server error", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, expectedPath, r.URL.Path)
-				message := ErrorMessage{
-					Code:    500,
-					Message: "Internal server error",
-				}
-				resp, err := json.Marshal(message)
-				require.NoError(t, err)
-				return &http.Response{
-					StatusCode: http.StatusInternalServerError,
-					Body:       io.NopCloser(bytes.NewBuffer(resp)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
+	hc = &http.Client{
+		Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
+			require.Equal(t, expectedPath, r.URL.Path)
+			return &http.Response{
+				StatusCode: http.StatusNoContent,
+				Body:       io.NopCloser(bytes.NewBuffer([]byte("No header is available."))),
+				Request:    r.Clone(ctx),
+			}, nil
+		}),
+	}
+	c = &Client{
+		hc:      hc,
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}
+	_, err = c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
+	require.ErrorIs(t, err, ErrNoContent)

-		_, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
-		require.ErrorIs(t, err, ErrNotOK)
-	})
-	t.Run("header not available", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, expectedPath, r.URL.Path)
-				return &http.Response{
-					StatusCode: http.StatusNoContent,
-					Body:       io.NopCloser(bytes.NewBuffer([]byte("No header is available."))),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-		_, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
-		require.ErrorIs(t, err, ErrNoContent)
-	})
-	t.Run("bellatrix", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, expectedPath, r.URL.Path)
-				return &http.Response{
-					StatusCode: http.StatusOK,
-					Body:       io.NopCloser(bytes.NewBufferString(testExampleHeaderResponse)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-		h, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
-		require.NoError(t, err)
-		expectedSig := ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505")
-		require.Equal(t, true, bytes.Equal(expectedSig, h.Signature()))
-		expectedTxRoot := ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-		bid, err := h.Message()
-		require.NoError(t, err)
-		bidHeader, err := bid.Header()
-		require.NoError(t, err)
-		withdrawalsRoot, err := bidHeader.TransactionsRoot()
-		require.NoError(t, err)
-		require.Equal(t, true, bytes.Equal(expectedTxRoot, withdrawalsRoot))
-		require.Equal(t, uint64(1), bidHeader.GasUsed())
-		value, err := stringToUint256("652312848583266388373324160190187140051835877600158453279131187530910662656")
-		require.NoError(t, err)
-		require.Equal(t, fmt.Sprintf("%#x", value.SSZBytes()), fmt.Sprintf("%#x", bid.Value()))
-	})
-	t.Run("capella", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, expectedPath, r.URL.Path)
-				return &http.Response{
-					StatusCode: http.StatusOK,
-					Body:       io.NopCloser(bytes.NewBufferString(testExampleHeaderResponseCapella)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-		h, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
-		require.NoError(t, err)
-		expectedWithdrawalsRoot := ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-		bid, err := h.Message()
-		require.NoError(t, err)
-		bidHeader, err := bid.Header()
-		require.NoError(t, err)
-		withdrawalsRoot, err := bidHeader.WithdrawalsRoot()
-		require.NoError(t, err)
-		require.Equal(t, true, bytes.Equal(expectedWithdrawalsRoot, withdrawalsRoot))
-	})
-	t.Run("unsupported version", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, expectedPath, r.URL.Path)
-				return &http.Response{
-					StatusCode: http.StatusOK,
-					Body:       io.NopCloser(bytes.NewBufferString(testExampleHeaderResponseUnknownVersion)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-		_, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
-		require.ErrorContains(t, "unsupported header version", err)
-	})
+	hc = &http.Client{
+		Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
+			require.Equal(t, expectedPath, r.URL.Path)
+			return &http.Response{
+				StatusCode: http.StatusOK,
+				Body:       io.NopCloser(bytes.NewBufferString(testExampleHeaderResponse)),
+				Request:    r.Clone(ctx),
+			}, nil
+		}),
+	}
+	c = &Client{
+		hc:      hc,
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}
+	h, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
+	require.NoError(t, err)
+	expectedSig := ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505")
+	require.Equal(t, true, bytes.Equal(expectedSig, h.Signature))
+	expectedTxRoot := ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
+	require.Equal(t, true, bytes.Equal(expectedTxRoot, h.Message.Header.TransactionsRoot))
+	require.Equal(t, uint64(1), h.Message.Header.GasUsed)
+	value := stringToUint256("652312848583266388373324160190187140051835877600158453279131187530910662656")
+	require.Equal(t, fmt.Sprintf("%#x", value.SSZBytes()), fmt.Sprintf("%#x", h.Message.Value))
 }

 func TestSubmitBlindedBlock(t *testing.T) {
 	ctx := context.Background()
-
-	t.Run("bellatrix", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, postBlindedBeaconBlockPath, r.URL.Path)
-				return &http.Response{
-					StatusCode: http.StatusOK,
-					Body:       io.NopCloser(bytes.NewBufferString(testExampleExecutionPayload)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-		sbbb, err := blocks.NewSignedBeaconBlock(testSignedBlindedBeaconBlockBellatrix(t))
-		require.NoError(t, err)
-		ep, err := c.SubmitBlindedBlock(ctx, sbbb)
-		require.NoError(t, err)
-		require.Equal(t, true, bytes.Equal(ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"), ep.ParentHash()))
-		bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-		require.NoError(t, err)
-		require.Equal(t, fmt.Sprintf("%#x", bfpg.SSZBytes()), fmt.Sprintf("%#x", ep.BaseFeePerGas()))
-		require.Equal(t, uint64(1), ep.GasLimit())
-	})
-	t.Run("capella", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, postBlindedBeaconBlockPath, r.URL.Path)
-				return &http.Response{
-					StatusCode: http.StatusOK,
-					Body:       io.NopCloser(bytes.NewBufferString(testExampleExecutionPayloadCapella)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-		sbb, err := blocks.NewSignedBeaconBlock(testSignedBlindedBeaconBlockCapella(t))
-		require.NoError(t, err)
-		ep, err := c.SubmitBlindedBlock(ctx, sbb)
-		require.NoError(t, err)
-		withdrawals, err := ep.Withdrawals()
-		require.NoError(t, err)
-		require.Equal(t, 1, len(withdrawals))
-		assert.Equal(t, uint64(1), withdrawals[0].Index)
-		assert.Equal(t, types.ValidatorIndex(1), withdrawals[0].ValidatorIndex)
-		assert.DeepEqual(t, ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943"), withdrawals[0].Address)
-		assert.Equal(t, uint64(1), withdrawals[0].Amount)
-	})
-	t.Run("not blinded", func(t *testing.T) {
-		sbb, err := blocks.NewSignedBeaconBlock(&eth.SignedBeaconBlockBellatrix{Block: &eth.BeaconBlockBellatrix{Body: &eth.BeaconBlockBodyBellatrix{}}})
-		require.NoError(t, err)
-		_, err = (&Client{}).SubmitBlindedBlock(ctx, sbb)
-		require.ErrorIs(t, err, errNotBlinded)
-	})
+	hc := &http.Client{
+		Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
+			require.Equal(t, postBlindedBeaconBlockPath, r.URL.Path)
+			return &http.Response{
+				StatusCode: http.StatusOK,
+				Body:       io.NopCloser(bytes.NewBufferString(testExampleExecutionPayload)),
+				Request:    r.Clone(ctx),
+			}, nil
+		}),
+	}
+	c := &Client{
+		hc:      hc,
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}
+	sbbb := testSignedBlindedBeaconBlockBellatrix(t)
+	ep, err := c.SubmitBlindedBlock(ctx, sbbb)
+	require.NoError(t, err)
+	require.Equal(t, true, bytes.Equal(ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"), ep.ParentHash))
+	bfpg := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
+	require.Equal(t, fmt.Sprintf("%#x", bfpg.SSZBytes()), fmt.Sprintf("%#x", ep.BaseFeePerGas))
+	require.Equal(t, uint64(1), ep.GasLimit)
 }

 func testSignedBlindedBeaconBlockBellatrix(t *testing.T) *eth.SignedBlindedBeaconBlockBellatrix {
@@ -451,149 +353,6 @@ func testSignedBlindedBeaconBlockBellatrix(t *testing.T) *eth.SignedBlindedBeaco
 	}
 }

-func testSignedBlindedBeaconBlockCapella(t *testing.T) *eth.SignedBlindedBeaconBlockCapella {
-	return &eth.SignedBlindedBeaconBlockCapella{
-		Block: &eth.BlindedBeaconBlockCapella{
-			Slot:          1,
-			ProposerIndex: 1,
-			ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-			StateRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-			Body: &eth.BlindedBeaconBlockBodyCapella{
-				RandaoReveal: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-				Eth1Data: &eth.Eth1Data{
-					DepositRoot:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					DepositCount: 1,
-					BlockHash:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-				},
-				Graffiti: ezDecode(t, "0xdeadbeefc0ffee"),
-				ProposerSlashings: []*eth.ProposerSlashing{
-					{
-						Header_1: &eth.SignedBeaconBlockHeader{
-							Header: &eth.BeaconBlockHeader{
-								Slot:          1,
-								ProposerIndex: 1,
-								ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								StateRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								BodyRoot:      ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							},
-							Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-						Header_2: &eth.SignedBeaconBlockHeader{
-							Header: &eth.BeaconBlockHeader{
-								Slot:          1,
-								ProposerIndex: 1,
-								ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								StateRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								BodyRoot:      ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							},
-							Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-					},
-				},
-				AttesterSlashings: []*eth.AttesterSlashing{
-					{
-						Attestation_1: &eth.IndexedAttestation{
-							AttestingIndices: []uint64{1},
-							Data: &eth.AttestationData{
-								Slot:            1,
-								CommitteeIndex:  1,
-								BeaconBlockRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								Source: &eth.Checkpoint{
-									Epoch: 1,
-									Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								},
-								Target: &eth.Checkpoint{
-									Epoch: 1,
-									Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								},
-							},
-							Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-						Attestation_2: &eth.IndexedAttestation{
-							AttestingIndices: []uint64{1},
-							Data: &eth.AttestationData{
-								Slot:            1,
-								CommitteeIndex:  1,
-								BeaconBlockRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								Source: &eth.Checkpoint{
-									Epoch: 1,
-									Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								},
-								Target: &eth.Checkpoint{
-									Epoch: 1,
-									Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								},
-							},
-							Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-					},
-				},
-				Attestations: []*eth.Attestation{
-					{
-						AggregationBits: bitfield.Bitlist{0x01},
-						Data: &eth.AttestationData{
-							Slot:            1,
-							CommitteeIndex:  1,
-							BeaconBlockRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							Source: &eth.Checkpoint{
-								Epoch: 1,
-								Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							},
-							Target: &eth.Checkpoint{
-								Epoch: 1,
-								Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							},
-						},
-						Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-					},
-				},
-				Deposits: []*eth.Deposit{
-					{
-						Proof: [][]byte{ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")},
-						Data: &eth.Deposit_Data{
-							PublicKey:             ezDecode(t, "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"),
-							WithdrawalCredentials: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							Amount:                1,
-							Signature:             ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-					},
-				},
-				VoluntaryExits: []*eth.SignedVoluntaryExit{
-					{
-						Exit: &eth.VoluntaryExit{
-							Epoch:          1,
-							ValidatorIndex: 1,
-						},
-						Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-					},
-				},
-				SyncAggregate: &eth.SyncAggregate{
-					SyncCommitteeSignature: make([]byte, 48),
-					SyncCommitteeBits:      bitfield.Bitvector512{0x01},
-				},
-				ExecutionPayloadHeader: &v1.ExecutionPayloadHeaderCapella{
-					ParentHash:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					FeeRecipient:     ezDecode(t, "0xabcf8e0d4e9587369b2301d0790347320302cc09"),
-					StateRoot:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					ReceiptsRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					LogsBloom:        ezDecode(t, "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
-					PrevRandao:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					BlockNumber:      1,
-					GasLimit:         1,
-					GasUsed:          1,
-					Timestamp:        1,
-					ExtraData:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					BaseFeePerGas:    []byte(strconv.FormatUint(1, 10)),
-					BlockHash:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					TransactionsRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					WithdrawalsRoot:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-				},
-			},
-		},
-		Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-	}
-}
-
 func TestRequestLogger(t *testing.T) {
 	wo := WithObserver(&requestLogger{})
 	c, err := NewClient("localhost:3500", wo)
--- a/api/client/builder/testdata/blinded-block-capella.json
+++ b/api/client/builder/testdata/blinded-block-capella.json
--- a/api/client/builder/testdata/execution-payload-capella.json
+++ b/api/client/builder/testdata/execution-payload-capella.json
@@ -1 +0,0 @@
-{"parent_hash":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","fee_recipient":"0xabcf8e0d4e9587369b2301d0790347320302cc09","state_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","receipts_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","logs_bloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","prev_randao":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","block_number":"1","gas_limit":"1","gas_used":"1","timestamp":"1","extra_data":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","base_fee_per_gas":"14074904626401341155369551180448584754667373453244490859944217516317499064576","block_hash":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","transactions_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","withdrawals_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}
--- a/api/client/builder/testing/BUILD.bazel
+++ b/api/client/builder/testing/BUILD.bazel
@@ -1,15 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library")
-
-go_library(
-    name = "go_default_library",
-    srcs = ["mock.go"],
-    importpath = "github.com/prysmaticlabs/prysm/v3/api/client/builder/testing",
-    visibility = ["//visibility:public"],
-    deps = [
-        "//api/client/builder:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
-        "//consensus-types/primitives:go_default_library",
-        "//encoding/bytesutil:go_default_library",
-        "//proto/prysm/v1alpha1:go_default_library",
-    ],
-)
--- a/api/client/builder/testing/mock.go
+++ b/api/client/builder/testing/mock.go
@@ -1,50 +0,0 @@
-package testing
-
-import (
-	"context"
-
-	"github.com/prysmaticlabs/prysm/v3/api/client/builder"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
-	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
-)
-
-// MockClient is a mock implementation of BuilderClient.
-type MockClient struct {
-	RegisteredVals map[[48]byte]bool
-}
-
-// NewClient creates a new, correctly initialized mock.
-func NewClient() MockClient {
-	return MockClient{RegisteredVals: map[[48]byte]bool{}}
-}
-
-// NodeURL --
-func (MockClient) NodeURL() string {
-	return ""
-}
-
-// GetHeader --
-func (MockClient) GetHeader(_ context.Context, _ primitives.Slot, _ [32]byte, _ [48]byte) (builder.SignedBid, error) {
-	return nil, nil
-}
-
-// RegisterValidator --
-func (m MockClient) RegisterValidator(_ context.Context, svr []*ethpb.SignedValidatorRegistrationV1) error {
-	for _, r := range svr {
-		b := bytesutil.ToBytes48(r.Message.Pubkey)
-		m.RegisteredVals[b] = true
-	}
-	return nil
-}
-
-// SubmitBlindedBlock --
-func (MockClient) SubmitBlindedBlock(_ context.Context, _ interfaces.SignedBeaconBlock) (interfaces.ExecutionData, error) {
-	return nil, nil
-}
-
-// Status --
-func (MockClient) Status(_ context.Context) error {
-	return nil
-}
--- a/api/client/builder/types.go
+++ b/api/client/builder/types.go
@@ -8,7 +8,6 @@ import (

 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/pkg/errors"
-	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	v1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	eth "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
@@ -24,8 +23,8 @@ type ValidatorRegistration struct {

 func (r *SignedValidatorRegistration) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Message   *ValidatorRegistration `json:"message"`
-		Signature hexutil.Bytes          `json:"signature"`
+		Message   *ValidatorRegistration `json:"message,omitempty"`
+		Signature hexutil.Bytes          `json:"signature,omitempty"`
 	}{
 		Message:   &ValidatorRegistration{r.Message},
 		Signature: r.SignedValidatorRegistrationV1.Signature,
@@ -37,8 +36,8 @@ func (r *SignedValidatorRegistration) UnmarshalJSON(b []byte) error {
 		r.SignedValidatorRegistrationV1 = &eth.SignedValidatorRegistrationV1{}
 	}
 	o := struct {
-		Message   *ValidatorRegistration `json:"message"`
-		Signature hexutil.Bytes          `json:"signature"`
+		Message   *ValidatorRegistration `json:"message,omitempty"`
+		Signature hexutil.Bytes          `json:"signature,omitempty"`
 	}{}
 	if err := json.Unmarshal(b, &o); err != nil {
 		return err
@@ -50,10 +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"`
-		GasLimit     string        `json:"gas_limit"`
-		Timestamp    string        `json:"timestamp"`
-		Pubkey       hexutil.Bytes `json:"pubkey"`
+		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: r.FeeRecipient,
 		GasLimit:     fmt.Sprintf("%d", r.GasLimit),
@@ -67,10 +66,10 @@ func (r *ValidatorRegistration) UnmarshalJSON(b []byte) error {
 		r.ValidatorRegistrationV1 = &eth.ValidatorRegistrationV1{}
 	}
 	o := struct {
-		FeeRecipient hexutil.Bytes `json:"fee_recipient"`
-		GasLimit     string        `json:"gas_limit"`
-		Timestamp    string        `json:"timestamp"`
-		Pubkey       hexutil.Bytes `json:"pubkey"`
+		FeeRecipient hexutil.Bytes `json:"fee_recipient,omitempty"`
+		GasLimit     string        `json:"gas_limit,omitempty"`
+		Timestamp    string        `json:"timestamp,omitempty"`
+		Pubkey       hexutil.Bytes `json:"pubkey,omitempty"`
 	}{}
 	if err := json.Unmarshal(b, &o); err != nil {
 		return err
@@ -89,43 +88,29 @@ func (r *ValidatorRegistration) UnmarshalJSON(b []byte) error {
 	return nil
 }

-var errInvalidUint256 = errors.New("invalid Uint256")
-var errDecodeUint256 = errors.New("unable to decode into Uint256")
-
 type Uint256 struct {
 	*big.Int
 }

-func isValidUint256(bi *big.Int) bool {
-	return bi.Cmp(big.NewInt(0)) >= 0 && bi.BitLen() <= 256
-}
-
-func stringToUint256(s string) (Uint256, error) {
+func stringToUint256(s string) Uint256 {
 	bi := new(big.Int)
-	_, ok := bi.SetString(s, 10)
-	if !ok || !isValidUint256(bi) {
-		return Uint256{}, errors.Wrapf(errDecodeUint256, "value=%s", s)
-	}
-	return Uint256{Int: bi}, nil
+	bi.SetString(s, 10)
+	return Uint256{Int: bi}
 }

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

 // SSZBytes creates an ssz-style (little-endian byte slice) representation of the Uint256
 func (s Uint256) SSZBytes() []byte {
-	if !isValidUint256(s.Int) {
-		return []byte{}
-	}
 	return bytesutil.PadTo(bytesutil.ReverseByteOrder(s.Int.Bytes()), 32)
 }

+var errUnmarshalUint256Failed = errors.New("unable to UnmarshalText into a Uint256 value")
+
 func (s *Uint256) UnmarshalJSON(t []byte) error {
 	start := 0
 	end := len(t)
@@ -144,10 +129,7 @@ func (s *Uint256) UnmarshalText(t []byte) error {
 	}
 	z, ok := s.SetString(string(t), 10)
 	if !ok {
-		return errors.Wrapf(errDecodeUint256, "value=%s", t)
-	}
-	if !isValidUint256(z) {
-		return errors.Wrapf(errDecodeUint256, "value=%s", t)
+		return errors.Wrapf(errUnmarshalUint256Failed, "value=%s", string(t))
 	}
 	s.Int = z
 	return nil
@@ -164,9 +146,6 @@ func (s Uint256) MarshalJSON() ([]byte, error) {
 }

 func (s Uint256) MarshalText() ([]byte, error) {
-	if !isValidUint256(s.Int) {
-		return nil, errors.Wrapf(errInvalidUint256, "value=%s", s.Int)
-	}
 	return []byte(s.String()), nil
 }

@@ -182,16 +161,12 @@ func (s Uint64String) MarshalText() ([]byte, error) {
 	return []byte(fmt.Sprintf("%d", s)), nil
 }

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

 func (ehr *ExecHeaderResponse) ToProto() (*eth.SignedBuilderBid, error) {
@@ -237,35 +212,31 @@ func (h *ExecutionPayloadHeader) ToProto() (*v1.ExecutionPayloadHeader, error) {
 }

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

 type ExecutionPayloadHeader struct {
-	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"`
+	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"`
 	*v1.ExecutionPayloadHeader
 }

 func (h *ExecutionPayloadHeader) MarshalJSON() ([]byte, error) {
 	type MarshalCaller ExecutionPayloadHeader
-	baseFeePerGas, err := sszBytesToUint256(h.ExecutionPayloadHeader.BaseFeePerGas)
-	if err != nil {
-		return []byte{}, errors.Wrapf(err, "invalid BaseFeePerGas")
-	}
 	return json.Marshal(&MarshalCaller{
 		ParentHash:       h.ExecutionPayloadHeader.ParentHash,
 		FeeRecipient:     h.ExecutionPayloadHeader.FeeRecipient,
@@ -278,7 +249,7 @@ func (h *ExecutionPayloadHeader) MarshalJSON() ([]byte, error) {
 		GasUsed:          Uint64String(h.ExecutionPayloadHeader.GasUsed),
 		Timestamp:        Uint64String(h.ExecutionPayloadHeader.Timestamp),
 		ExtraData:        h.ExecutionPayloadHeader.ExtraData,
-		BaseFeePerGas:    baseFeePerGas,
+		BaseFeePerGas:    sszBytesToUint256(h.ExecutionPayloadHeader.BaseFeePerGas),
 		BlockHash:        h.ExecutionPayloadHeader.BlockHash,
 		TransactionsRoot: h.ExecutionPayloadHeader.TransactionsRoot,
 	})
@@ -298,25 +269,25 @@ func (h *ExecutionPayloadHeader) UnmarshalJSON(b []byte) error {
 }

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

 type ExecutionPayload struct {
-	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"`
+	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"`
 }

 func (r *ExecPayloadResponse) ToProto() (*v1.ExecutionPayload, error) {
@@ -346,186 +317,6 @@ func (p *ExecutionPayload) ToProto() (*v1.ExecutionPayload, error) {
 	}, nil
 }

-type ExecHeaderResponseCapella struct {
-	Data struct {
-		Signature hexutil.Bytes      `json:"signature"`
-		Message   *BuilderBidCapella `json:"message"`
-	} `json:"data"`
-}
-
-func (ehr *ExecHeaderResponseCapella) ToProto() (*eth.SignedBuilderBidCapella, error) {
-	bb, err := ehr.Data.Message.ToProto()
-	if err != nil {
-		return nil, err
-	}
-	return &eth.SignedBuilderBidCapella{
-		Message:   bb,
-		Signature: ehr.Data.Signature,
-	}, nil
-}
-
-func (bb *BuilderBidCapella) ToProto() (*eth.BuilderBidCapella, error) {
-	header, err := bb.Header.ToProto()
-	if err != nil {
-		return nil, err
-	}
-	return &eth.BuilderBidCapella{
-		Header: header,
-		Value:  bb.Value.SSZBytes(),
-		Pubkey: bb.Pubkey,
-	}, nil
-}
-
-func (h *ExecutionPayloadHeaderCapella) ToProto() (*v1.ExecutionPayloadHeaderCapella, error) {
-	return &v1.ExecutionPayloadHeaderCapella{
-		ParentHash:       h.ParentHash,
-		FeeRecipient:     h.FeeRecipient,
-		StateRoot:        h.StateRoot,
-		ReceiptsRoot:     h.ReceiptsRoot,
-		LogsBloom:        h.LogsBloom,
-		PrevRandao:       h.PrevRandao,
-		BlockNumber:      uint64(h.BlockNumber),
-		GasLimit:         uint64(h.GasLimit),
-		GasUsed:          uint64(h.GasUsed),
-		Timestamp:        uint64(h.Timestamp),
-		ExtraData:        h.ExtraData,
-		BaseFeePerGas:    h.BaseFeePerGas.SSZBytes(),
-		BlockHash:        h.BlockHash,
-		TransactionsRoot: h.TransactionsRoot,
-		WithdrawalsRoot:  h.WithdrawalsRoot,
-	}, nil
-}
-
-type BuilderBidCapella struct {
-	Header *ExecutionPayloadHeaderCapella `json:"header"`
-	Value  Uint256                        `json:"value"`
-	Pubkey hexutil.Bytes                  `json:"pubkey"`
-}
-
-type ExecutionPayloadHeaderCapella struct {
-	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"`
-	WithdrawalsRoot  hexutil.Bytes `json:"withdrawals_root"`
-	*v1.ExecutionPayloadHeaderCapella
-}
-
-func (h *ExecutionPayloadHeaderCapella) MarshalJSON() ([]byte, error) {
-	type MarshalCaller ExecutionPayloadHeaderCapella
-	baseFeePerGas, err := sszBytesToUint256(h.ExecutionPayloadHeaderCapella.BaseFeePerGas)
-	if err != nil {
-		return []byte{}, errors.Wrapf(err, "invalid BaseFeePerGas")
-	}
-	return json.Marshal(&MarshalCaller{
-		ParentHash:       h.ExecutionPayloadHeaderCapella.ParentHash,
-		FeeRecipient:     h.ExecutionPayloadHeaderCapella.FeeRecipient,
-		StateRoot:        h.ExecutionPayloadHeaderCapella.StateRoot,
-		ReceiptsRoot:     h.ExecutionPayloadHeaderCapella.ReceiptsRoot,
-		LogsBloom:        h.ExecutionPayloadHeaderCapella.LogsBloom,
-		PrevRandao:       h.ExecutionPayloadHeaderCapella.PrevRandao,
-		BlockNumber:      Uint64String(h.ExecutionPayloadHeaderCapella.BlockNumber),
-		GasLimit:         Uint64String(h.ExecutionPayloadHeaderCapella.GasLimit),
-		GasUsed:          Uint64String(h.ExecutionPayloadHeaderCapella.GasUsed),
-		Timestamp:        Uint64String(h.ExecutionPayloadHeaderCapella.Timestamp),
-		ExtraData:        h.ExecutionPayloadHeaderCapella.ExtraData,
-		BaseFeePerGas:    baseFeePerGas,
-		BlockHash:        h.ExecutionPayloadHeaderCapella.BlockHash,
-		TransactionsRoot: h.ExecutionPayloadHeaderCapella.TransactionsRoot,
-		WithdrawalsRoot:  h.ExecutionPayloadHeaderCapella.WithdrawalsRoot,
-	})
-}
-
-func (h *ExecutionPayloadHeaderCapella) UnmarshalJSON(b []byte) error {
-	type UnmarshalCaller ExecutionPayloadHeaderCapella
-	uc := &UnmarshalCaller{}
-	if err := json.Unmarshal(b, uc); err != nil {
-		return err
-	}
-	ep := ExecutionPayloadHeaderCapella(*uc)
-	*h = ep
-	var err error
-	h.ExecutionPayloadHeaderCapella, err = h.ToProto()
-	return err
-}
-
-type ExecPayloadResponseCapella struct {
-	Version string                  `json:"version"`
-	Data    ExecutionPayloadCapella `json:"data"`
-}
-
-type ExecutionPayloadCapella struct {
-	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"`
-	Withdrawals   []Withdrawal    `json:"withdrawals"`
-}
-
-func (r *ExecPayloadResponseCapella) ToProto() (*v1.ExecutionPayloadCapella, error) {
-	return r.Data.ToProto()
-}
-
-func (p *ExecutionPayloadCapella) ToProto() (*v1.ExecutionPayloadCapella, error) {
-	txs := make([][]byte, len(p.Transactions))
-	for i := range p.Transactions {
-		txs[i] = p.Transactions[i]
-	}
-	withdrawals := make([]*v1.Withdrawal, len(p.Withdrawals))
-	for i, w := range p.Withdrawals {
-		withdrawals[i] = &v1.Withdrawal{
-			Index:          w.Index.Uint64(),
-			ValidatorIndex: types.ValidatorIndex(w.ValidatorIndex.Uint64()),
-			Address:        w.Address,
-			Amount:         w.Amount.Uint64(),
-		}
-	}
-	return &v1.ExecutionPayloadCapella{
-		ParentHash:    p.ParentHash,
-		FeeRecipient:  p.FeeRecipient,
-		StateRoot:     p.StateRoot,
-		ReceiptsRoot:  p.ReceiptsRoot,
-		LogsBloom:     p.LogsBloom,
-		PrevRandao:    p.PrevRandao,
-		BlockNumber:   uint64(p.BlockNumber),
-		GasLimit:      uint64(p.GasLimit),
-		GasUsed:       uint64(p.GasUsed),
-		Timestamp:     uint64(p.Timestamp),
-		ExtraData:     p.ExtraData,
-		BaseFeePerGas: p.BaseFeePerGas.SSZBytes(),
-		BlockHash:     p.BlockHash,
-		Transactions:  txs,
-		Withdrawals:   withdrawals,
-	}, nil
-}
-
-type Withdrawal struct {
-	Index          Uint256       `json:"index"`
-	ValidatorIndex Uint256       `json:"validator_index"`
-	Address        hexutil.Bytes `json:"address"`
-	Amount         Uint256       `json:"amount"`
-}
-
 type SignedBlindedBeaconBlockBellatrix struct {
 	*eth.SignedBlindedBeaconBlockBellatrix
 }
@@ -540,8 +331,8 @@ type BlindedBeaconBlockBodyBellatrix struct {

 func (r *SignedBlindedBeaconBlockBellatrix) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Message   *BlindedBeaconBlockBellatrix `json:"message"`
-		Signature hexutil.Bytes                `json:"signature"`
+		Message   *BlindedBeaconBlockBellatrix `json:"message,omitempty"`
+		Signature hexutil.Bytes                `json:"signature,omitempty"`
 	}{
 		Message:   &BlindedBeaconBlockBellatrix{r.SignedBlindedBeaconBlockBellatrix.Block},
 		Signature: r.SignedBlindedBeaconBlockBellatrix.Signature,
@@ -551,10 +342,10 @@ 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"`
-		ParentRoot    hexutil.Bytes                    `json:"parent_root"`
-		StateRoot     hexutil.Bytes                    `json:"state_root"`
-		Body          *BlindedBeaconBlockBodyBellatrix `json:"body"`
+		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"`
 	}{
 		Slot:          fmt.Sprintf("%d", b.Slot),
 		ProposerIndex: fmt.Sprintf("%d", b.ProposerIndex),
@@ -570,8 +361,8 @@ type ProposerSlashing struct {

 func (s *ProposerSlashing) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		SignedHeader1 *SignedBeaconBlockHeader `json:"signed_header_1"`
-		SignedHeader2 *SignedBeaconBlockHeader `json:"signed_header_2"`
+		SignedHeader1 *SignedBeaconBlockHeader `json:"signed_header_1,omitempty"`
+		SignedHeader2 *SignedBeaconBlockHeader `json:"signed_header_2,omitempty"`
 	}{
 		SignedHeader1: &SignedBeaconBlockHeader{s.ProposerSlashing.Header_1},
 		SignedHeader2: &SignedBeaconBlockHeader{s.ProposerSlashing.Header_2},
@@ -584,8 +375,8 @@ type SignedBeaconBlockHeader struct {

 func (h *SignedBeaconBlockHeader) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Header    *BeaconBlockHeader `json:"message"`
-		Signature hexutil.Bytes      `json:"signature"`
+		Header    *BeaconBlockHeader `json:"message,omitempty"`
+		Signature hexutil.Bytes      `json:"signature,omitempty"`
 	}{
 		Header:    &BeaconBlockHeader{h.SignedBeaconBlockHeader.Header},
 		Signature: h.SignedBeaconBlockHeader.Signature,
@@ -598,11 +389,11 @@ type BeaconBlockHeader struct {

 func (h *BeaconBlockHeader) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		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          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:          fmt.Sprintf("%d", h.BeaconBlockHeader.Slot),
 		ProposerIndex: fmt.Sprintf("%d", h.BeaconBlockHeader.ProposerIndex),
@@ -622,9 +413,9 @@ func (a *IndexedAttestation) MarshalJSON() ([]byte, error) {
 		indices[i] = fmt.Sprintf("%d", a.AttestingIndices[i])
 	}
 	return json.Marshal(struct {
-		AttestingIndices []string         `json:"attesting_indices"`
-		Data             *AttestationData `json:"data"`
-		Signature        hexutil.Bytes    `json:"signature"`
+		AttestingIndices []string         `json:"attesting_indices,omitempty"`
+		Data             *AttestationData `json:"data,omitempty"`
+		Signature        hexutil.Bytes    `json:"signature,omitempty"`
 	}{
 		AttestingIndices: indices,
 		Data:             &AttestationData{a.IndexedAttestation.Data},
@@ -638,8 +429,8 @@ type AttesterSlashing struct {

 func (s *AttesterSlashing) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Attestation1 *IndexedAttestation `json:"attestation_1"`
-		Attestation2 *IndexedAttestation `json:"attestation_2"`
+		Attestation1 *IndexedAttestation `json:"attestation_1,omitempty"`
+		Attestation2 *IndexedAttestation `json:"attestation_2,omitempty"`
 	}{
 		Attestation1: &IndexedAttestation{s.Attestation_1},
 		Attestation2: &IndexedAttestation{s.Attestation_2},
@@ -652,8 +443,8 @@ type Checkpoint struct {

 func (c *Checkpoint) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Epoch string        `json:"epoch"`
-		Root  hexutil.Bytes `json:"root"`
+		Epoch string        `json:"epoch,omitempty"`
+		Root  hexutil.Bytes `json:"root,omitempty"`
 	}{
 		Epoch: fmt.Sprintf("%d", c.Checkpoint.Epoch),
 		Root:  c.Checkpoint.Root,
@@ -666,11 +457,11 @@ type AttestationData struct {

 func (a *AttestationData) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Slot            string        `json:"slot"`
-		Index           string        `json:"index"`
-		BeaconBlockRoot hexutil.Bytes `json:"beacon_block_root"`
-		Source          *Checkpoint   `json:"source"`
-		Target          *Checkpoint   `json:"target"`
+		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:            fmt.Sprintf("%d", a.AttestationData.Slot),
 		Index:           fmt.Sprintf("%d", a.AttestationData.CommitteeIndex),
@@ -686,9 +477,9 @@ type Attestation struct {

 func (a *Attestation) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		AggregationBits hexutil.Bytes    `json:"aggregation_bits"`
-		Data            *AttestationData `json:"data"`
-		Signature       hexutil.Bytes    `json:"signature" ssz-size:"96"`
+		AggregationBits hexutil.Bytes    `json:"aggregation_bits,omitempty"`
+		Data            *AttestationData `json:"data,omitempty"`
+		Signature       hexutil.Bytes    `json:"signature,omitempty" ssz-size:"96"`
 	}{
 		AggregationBits: hexutil.Bytes(a.Attestation.AggregationBits),
 		Data:            &AttestationData{a.Attestation.Data},
@@ -702,10 +493,10 @@ type DepositData struct {

 func (d *DepositData) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		PublicKey             hexutil.Bytes `json:"pubkey"`
-		WithdrawalCredentials hexutil.Bytes `json:"withdrawal_credentials"`
-		Amount                string        `json:"amount"`
-		Signature             hexutil.Bytes `json:"signature"`
+		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:             d.PublicKey,
 		WithdrawalCredentials: d.WithdrawalCredentials,
@@ -738,8 +529,8 @@ type SignedVoluntaryExit struct {

 func (sve *SignedVoluntaryExit) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Message   *VoluntaryExit `json:"message"`
-		Signature hexutil.Bytes  `json:"signature"`
+		Message   *VoluntaryExit `json:"message,omitempty"`
+		Signature hexutil.Bytes  `json:"signature,omitempty"`
 	}{
 		Signature: sve.SignedVoluntaryExit.Signature,
 		Message:   &VoluntaryExit{sve.SignedVoluntaryExit.Exit},
@@ -752,8 +543,8 @@ type VoluntaryExit struct {

 func (ve *VoluntaryExit) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		Epoch          string `json:"epoch"`
-		ValidatorIndex string `json:"validator_index"`
+		Epoch          string `json:"epoch,omitempty"`
+		ValidatorIndex string `json:"validator_index,omitempty"`
 	}{
 		Epoch:          fmt.Sprintf("%d", ve.Epoch),
 		ValidatorIndex: fmt.Sprintf("%d", ve.ValidatorIndex),
@@ -766,8 +557,8 @@ type SyncAggregate struct {

 func (s *SyncAggregate) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		SyncCommitteeBits      hexutil.Bytes `json:"sync_committee_bits"`
-		SyncCommitteeSignature hexutil.Bytes `json:"sync_committee_signature"`
+		SyncCommitteeBits      hexutil.Bytes `json:"sync_committee_bits,omitempty"`
+		SyncCommitteeSignature hexutil.Bytes `json:"sync_committee_signature,omitempty"`
 	}{
 		SyncCommitteeBits:      hexutil.Bytes(s.SyncAggregate.SyncCommitteeBits),
 		SyncCommitteeSignature: s.SyncAggregate.SyncCommitteeSignature,
@@ -780,9 +571,9 @@ type Eth1Data struct {

 func (e *Eth1Data) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
-		DepositRoot  hexutil.Bytes `json:"deposit_root"`
-		DepositCount string        `json:"deposit_count"`
-		BlockHash    hexutil.Bytes `json:"block_hash"`
+		DepositRoot  hexutil.Bytes `json:"deposit_root,omitempty"`
+		DepositCount string        `json:"deposit_count,omitempty"`
+		BlockHash    hexutil.Bytes `json:"block_hash,omitempty"`
 	}{
 		DepositRoot:  e.DepositRoot,
 		DepositCount: fmt.Sprintf("%d", e.DepositCount),
@@ -812,16 +603,16 @@ func (b *BlindedBeaconBlockBodyBellatrix) MarshalJSON() ([]byte, error) {
 		pros[i] = &ProposerSlashing{ProposerSlashing: b.BlindedBeaconBlockBodyBellatrix.ProposerSlashings[i]}
 	}
 	return json.Marshal(struct {
-		RandaoReveal           hexutil.Bytes           `json:"randao_reveal"`
-		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           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:           b.RandaoReveal,
 		Eth1Data:               &Eth1Data{b.BlindedBeaconBlockBodyBellatrix.Eth1Data},
@@ -836,126 +627,6 @@ func (b *BlindedBeaconBlockBodyBellatrix) MarshalJSON() ([]byte, error) {
 	})
 }

-type SignedBLSToExecutionChange struct {
-	*eth.SignedBLSToExecutionChange
-}
-
-func (ch *SignedBLSToExecutionChange) MarshalJSON() ([]byte, error) {
-	return json.Marshal(struct {
-		Message   *BLSToExecutionChange `json:"message"`
-		Signature hexutil.Bytes         `json:"signature"`
-	}{
-		Signature: ch.Signature,
-		Message:   &BLSToExecutionChange{ch.Message},
-	})
-}
-
-type BLSToExecutionChange struct {
-	*eth.BLSToExecutionChange
-}
-
-func (ch *BLSToExecutionChange) MarshalJSON() ([]byte, error) {
-	return json.Marshal(struct {
-		ValidatorIndex     string        `json:"validator_index"`
-		FromBlsPubkey      hexutil.Bytes `json:"from_bls_pubkey"`
-		ToExecutionAddress hexutil.Bytes `json:"to_execution_address"`
-	}{
-		ValidatorIndex:     fmt.Sprintf("%d", ch.ValidatorIndex),
-		FromBlsPubkey:      ch.FromBlsPubkey,
-		ToExecutionAddress: ch.ToExecutionAddress,
-	})
-}
-
-type SignedBlindedBeaconBlockCapella struct {
-	*eth.SignedBlindedBeaconBlockCapella
-}
-
-type BlindedBeaconBlockCapella struct {
-	*eth.BlindedBeaconBlockCapella
-}
-
-type BlindedBeaconBlockBodyCapella struct {
-	*eth.BlindedBeaconBlockBodyCapella
-}
-
-func (b *SignedBlindedBeaconBlockCapella) MarshalJSON() ([]byte, error) {
-	return json.Marshal(struct {
-		Message   *BlindedBeaconBlockCapella `json:"message"`
-		Signature hexutil.Bytes              `json:"signature"`
-	}{
-		Message:   &BlindedBeaconBlockCapella{b.Block},
-		Signature: b.Signature,
-	})
-}
-
-func (b *BlindedBeaconBlockCapella) MarshalJSON() ([]byte, error) {
-	return json.Marshal(struct {
-		Slot          string                         `json:"slot"`
-		ProposerIndex string                         `json:"proposer_index"`
-		ParentRoot    hexutil.Bytes                  `json:"parent_root"`
-		StateRoot     hexutil.Bytes                  `json:"state_root"`
-		Body          *BlindedBeaconBlockBodyCapella `json:"body"`
-	}{
-		Slot:          fmt.Sprintf("%d", b.Slot),
-		ProposerIndex: fmt.Sprintf("%d", b.ProposerIndex),
-		ParentRoot:    b.ParentRoot,
-		StateRoot:     b.StateRoot,
-		Body:          &BlindedBeaconBlockBodyCapella{b.Body},
-	})
-}
-
-func (b *BlindedBeaconBlockBodyCapella) MarshalJSON() ([]byte, error) {
-	sve := make([]*SignedVoluntaryExit, len(b.VoluntaryExits))
-	for i := range b.VoluntaryExits {
-		sve[i] = &SignedVoluntaryExit{SignedVoluntaryExit: b.VoluntaryExits[i]}
-	}
-	deps := make([]*Deposit, len(b.Deposits))
-	for i := range b.Deposits {
-		deps[i] = &Deposit{Deposit: b.Deposits[i]}
-	}
-	atts := make([]*Attestation, len(b.Attestations))
-	for i := range b.Attestations {
-		atts[i] = &Attestation{Attestation: b.Attestations[i]}
-	}
-	atsl := make([]*AttesterSlashing, len(b.AttesterSlashings))
-	for i := range b.AttesterSlashings {
-		atsl[i] = &AttesterSlashing{AttesterSlashing: b.AttesterSlashings[i]}
-	}
-	pros := make([]*ProposerSlashing, len(b.ProposerSlashings))
-	for i := range b.ProposerSlashings {
-		pros[i] = &ProposerSlashing{ProposerSlashing: b.ProposerSlashings[i]}
-	}
-	chs := make([]*SignedBLSToExecutionChange, len(b.BlsToExecutionChanges))
-	for i := range b.BlsToExecutionChanges {
-		chs[i] = &SignedBLSToExecutionChange{SignedBLSToExecutionChange: b.BlsToExecutionChanges[i]}
-	}
-	return json.Marshal(struct {
-		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"`
-		BLSToExecutionChanges  []*SignedBLSToExecutionChange  `json:"bls_to_execution_changes"`
-		SyncAggregate          *SyncAggregate                 `json:"sync_aggregate"`
-		ExecutionPayloadHeader *ExecutionPayloadHeaderCapella `json:"execution_payload_header"`
-	}{
-		RandaoReveal:           b.RandaoReveal,
-		Eth1Data:               &Eth1Data{b.Eth1Data},
-		Graffiti:               b.Graffiti,
-		ProposerSlashings:      pros,
-		AttesterSlashings:      atsl,
-		Attestations:           atts,
-		Deposits:               deps,
-		VoluntaryExits:         sve,
-		BLSToExecutionChanges:  chs,
-		SyncAggregate:          &SyncAggregate{b.SyncAggregate},
-		ExecutionPayloadHeader: &ExecutionPayloadHeaderCapella{ExecutionPayloadHeaderCapella: b.ExecutionPayloadHeader},
-	})
-}
-
 type ErrorMessage struct {
 	Code        int      `json:"code"`
 	Message     string   `json:"message"`
--- a/api/client/builder/types_test.go
+++ b/api/client/builder/types_test.go
@@ -16,7 +16,6 @@ import (
 	"github.com/prysmaticlabs/go-bitfield"
 	v1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	eth "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v3/testing/assert"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 )

@@ -88,62 +87,6 @@ var testExampleHeaderResponse = `{
  }
 }`

-var testExampleHeaderResponseCapella = `{
-  "version": "capella",
-  "data": {
-    "message": {
-      "header": {
-        "parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-        "state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-        "prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "block_number": "1",
-        "gas_limit": "1",
-        "gas_used": "1",
-        "timestamp": "1",
-        "extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-        "block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "transactions_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "withdrawals_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"
-      },
-      "value": "652312848583266388373324160190187140051835877600158453279131187530910662656",
-      "pubkey": "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"
-    },
-    "signature": "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"
-  }
-}`
-
-var testExampleHeaderResponseUnknownVersion = `{
-  "version": "bad",
-  "data": {
-    "message": {
-      "header": {
-        "parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-        "state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-        "prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "block_number": "1",
-        "gas_limit": "1",
-        "gas_used": "1",
-        "timestamp": "1",
-        "extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-        "block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "transactions_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "withdrawals_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"
-      },
-      "value": "652312848583266388373324160190187140051835877600158453279131187530910662656",
-      "pubkey": "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"
-    },
-    "signature": "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"
-  }
-}`
-
 func TestExecutionHeaderResponseUnmarshal(t *testing.T) {
 	hr := &ExecHeaderResponse{}
 	require.NoError(t, json.Unmarshal([]byte(testExampleHeaderResponse), hr))
@@ -243,115 +186,9 @@ func TestExecutionHeaderResponseUnmarshal(t *testing.T) {
 	}
 }

-func TestExecutionHeaderResponseCapellaUnmarshal(t *testing.T) {
-	hr := &ExecHeaderResponseCapella{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleHeaderResponseCapella), hr))
-	cases := []struct {
-		expected string
-		actual   string
-		name     string
-	}{
-		{
-			expected: "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505",
-			actual:   hexutil.Encode(hr.Data.Signature),
-			name:     "Signature",
-		},
-		{
-			expected: "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a",
-			actual:   hexutil.Encode(hr.Data.Message.Pubkey),
-			name:     "ExecHeaderResponse.Pubkey",
-		},
-		{
-			expected: "652312848583266388373324160190187140051835877600158453279131187530910662656",
-			actual:   hr.Data.Message.Value.String(),
-			name:     "ExecHeaderResponse.Value",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(hr.Data.Message.Header.ParentHash),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.ParentHash",
-		},
-		{
-			expected: "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-			actual:   hexutil.Encode(hr.Data.Message.Header.FeeRecipient),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.FeeRecipient",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(hr.Data.Message.Header.StateRoot),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.StateRoot",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(hr.Data.Message.Header.ReceiptsRoot),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.ReceiptsRoot",
-		},
-		{
-			expected: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-			actual:   hexutil.Encode(hr.Data.Message.Header.LogsBloom),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.LogsBloom",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(hr.Data.Message.Header.PrevRandao),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.PrevRandao",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", hr.Data.Message.Header.BlockNumber),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.BlockNumber",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", hr.Data.Message.Header.GasLimit),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.GasLimit",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", hr.Data.Message.Header.GasUsed),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.GasUsed",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", hr.Data.Message.Header.Timestamp),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.Timestamp",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(hr.Data.Message.Header.ExtraData),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.ExtraData",
-		},
-		{
-			expected: "452312848583266388373324160190187140051835877600158453279131187530910662656",
-			actual:   fmt.Sprintf("%d", hr.Data.Message.Header.BaseFeePerGas),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.BaseFeePerGas",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(hr.Data.Message.Header.BlockHash),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.BlockHash",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(hr.Data.Message.Header.TransactionsRoot),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.TransactionsRoot",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(hr.Data.Message.Header.WithdrawalsRoot),
-			name:     "ExecHeaderResponse.ExecutionPayloadHeader.WithdrawalsRoot",
-		},
-	}
-	for _, c := range cases {
-		require.Equal(t, c.expected, c.actual, fmt.Sprintf("unexpected value for field %s", c.name))
-	}
-}
-
 func TestExecutionHeaderResponseToProto(t *testing.T) {
-	bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
-	v, err := stringToUint256("652312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
+	bfpg := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
+	v := stringToUint256("652312848583266388373324160190187140051835877600158453279131187530910662656")
 	hr := &ExecHeaderResponse{}
 	require.NoError(t, json.Unmarshal([]byte(testExampleHeaderResponse), hr))
 	p, err := hr.ToProto()
@@ -405,67 +242,6 @@ func TestExecutionHeaderResponseToProto(t *testing.T) {
 	require.DeepEqual(t, expected, p)
 }

-func TestExecutionHeaderResponseCapellaToProto(t *testing.T) {
-	bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
-	v, err := stringToUint256("652312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
-	hr := &ExecHeaderResponseCapella{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleHeaderResponseCapella), hr))
-	p, err := hr.ToProto()
-	require.NoError(t, err)
-	signature, err := hexutil.Decode("0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505")
-	require.NoError(t, err)
-	pubkey, err := hexutil.Decode("0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a")
-	require.NoError(t, err)
-	parentHash, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	feeRecipient, err := hexutil.Decode("0xabcf8e0d4e9587369b2301d0790347320302cc09")
-	require.NoError(t, err)
-	stateRoot, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	receiptsRoot, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	logsBloom, err := hexutil.Decode("0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
-	require.NoError(t, err)
-	prevRandao, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	extraData, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	blockHash, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	txRoot, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	withdrawalsRoot, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-
-	expected := &eth.SignedBuilderBidCapella{
-		Message: &eth.BuilderBidCapella{
-			Header: &v1.ExecutionPayloadHeaderCapella{
-				ParentHash:       parentHash,
-				FeeRecipient:     feeRecipient,
-				StateRoot:        stateRoot,
-				ReceiptsRoot:     receiptsRoot,
-				LogsBloom:        logsBloom,
-				PrevRandao:       prevRandao,
-				BlockNumber:      1,
-				GasLimit:         1,
-				GasUsed:          1,
-				Timestamp:        1,
-				ExtraData:        extraData,
-				BaseFeePerGas:    bfpg.SSZBytes(),
-				BlockHash:        blockHash,
-				TransactionsRoot: txRoot,
-				WithdrawalsRoot:  withdrawalsRoot,
-			},
-			Value:  v.SSZBytes(),
-			Pubkey: pubkey,
-		},
-		Signature: signature,
-	}
-	require.DeepEqual(t, expected, p)
-}
-
 var testExampleExecutionPayload = `{
  "version": "bellatrix",
  "data": {
@@ -488,36 +264,6 @@ var testExampleExecutionPayload = `{
  }
 }`

-var testExampleExecutionPayloadCapella = `{
-  "version": "capella",
-  "data": {
-    "parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-    "fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-    "state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-    "receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-    "logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-    "prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-    "block_number": "1",
-    "gas_limit": "1",
-    "gas_used": "1",
-    "timestamp": "1",
-    "extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-    "base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-    "block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-    "transactions": [
-      "0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86"
-    ],
-	"withdrawals": [
-	  {
-		"index": "1",
-		"validator_index": "1",
-		"address": "0xcf8e0d4e9587369b2301d0790347320302cc0943",
-		"amount": "1"
-	  }
-	]
-  }
-}`
-
 func TestExecutionPayloadResponseUnmarshal(t *testing.T) {
 	epr := &ExecPayloadResponse{}
 	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayload), epr))
@@ -600,95 +346,6 @@ func TestExecutionPayloadResponseUnmarshal(t *testing.T) {
 	require.Equal(t, txHash, hexutil.Encode(epr.Data.Transactions[0]))
 }

-func TestExecutionPayloadResponseCapellaUnmarshal(t *testing.T) {
-	epr := &ExecPayloadResponseCapella{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayloadCapella), epr))
-	cases := []struct {
-		expected string
-		actual   string
-		name     string
-	}{
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ParentHash),
-			name:     "ExecPayloadResponse.ExecutionPayload.ParentHash",
-		},
-		{
-			expected: "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-			actual:   hexutil.Encode(epr.Data.FeeRecipient),
-			name:     "ExecPayloadResponse.ExecutionPayload.FeeRecipient",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.StateRoot),
-			name:     "ExecPayloadResponse.ExecutionPayload.StateRoot",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ReceiptsRoot),
-			name:     "ExecPayloadResponse.ExecutionPayload.ReceiptsRoot",
-		},
-		{
-			expected: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-			actual:   hexutil.Encode(epr.Data.LogsBloom),
-			name:     "ExecPayloadResponse.ExecutionPayload.LogsBloom",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.PrevRandao),
-			name:     "ExecPayloadResponse.ExecutionPayload.PrevRandao",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", epr.Data.BlockNumber),
-			name:     "ExecPayloadResponse.ExecutionPayload.BlockNumber",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", epr.Data.GasLimit),
-			name:     "ExecPayloadResponse.ExecutionPayload.GasLimit",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", epr.Data.GasUsed),
-			name:     "ExecPayloadResponse.ExecutionPayload.GasUsed",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", epr.Data.Timestamp),
-			name:     "ExecPayloadResponse.ExecutionPayload.Timestamp",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ExtraData),
-			name:     "ExecPayloadResponse.ExecutionPayload.ExtraData",
-		},
-		{
-			expected: "452312848583266388373324160190187140051835877600158453279131187530910662656",
-			actual:   fmt.Sprintf("%d", epr.Data.BaseFeePerGas),
-			name:     "ExecPayloadResponse.ExecutionPayload.BaseFeePerGas",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.BlockHash),
-			name:     "ExecPayloadResponse.ExecutionPayload.BlockHash",
-		},
-	}
-	for _, c := range cases {
-		require.Equal(t, c.expected, c.actual, fmt.Sprintf("unexpected value for field %s", c.name))
-	}
-	require.Equal(t, 1, len(epr.Data.Transactions))
-	txHash := "0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86"
-	require.Equal(t, txHash, hexutil.Encode(epr.Data.Transactions[0]))
-
-	require.Equal(t, 1, len(epr.Data.Withdrawals))
-	w := epr.Data.Withdrawals[0]
-	assert.Equal(t, uint64(1), w.Index.Uint64())
-	assert.Equal(t, uint64(1), w.ValidatorIndex.Uint64())
-	assert.DeepEqual(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943", w.Address.String())
-	assert.Equal(t, uint64(1), w.Amount.Uint64())
-}
-
 func TestExecutionPayloadResponseToProto(t *testing.T) {
 	hr := &ExecPayloadResponse{}
 	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayload), hr))
@@ -716,8 +373,7 @@ func TestExecutionPayloadResponseToProto(t *testing.T) {
 	require.NoError(t, err)
 	txList := [][]byte{tx}

-	bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
+	bfpg := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
 	expected := &v1.ExecutionPayload{
 		ParentHash:    parentHash,
 		FeeRecipient:  feeRecipient,
@@ -737,65 +393,6 @@ func TestExecutionPayloadResponseToProto(t *testing.T) {
 	require.DeepEqual(t, expected, p)
 }

-func TestExecutionPayloadResponseCapellaToProto(t *testing.T) {
-	hr := &ExecPayloadResponseCapella{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayloadCapella), hr))
-	p, err := hr.ToProto()
-	require.NoError(t, err)
-
-	parentHash, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	feeRecipient, err := hexutil.Decode("0xabcf8e0d4e9587369b2301d0790347320302cc09")
-	require.NoError(t, err)
-	stateRoot, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	receiptsRoot, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	logsBloom, err := hexutil.Decode("0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
-	require.NoError(t, err)
-	prevRandao, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	extraData, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	blockHash, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-
-	tx, err := hexutil.Decode("0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86")
-	require.NoError(t, err)
-	txList := [][]byte{tx}
-	address, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943")
-	require.NoError(t, err)
-
-	bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
-	expected := &v1.ExecutionPayloadCapella{
-		ParentHash:    parentHash,
-		FeeRecipient:  feeRecipient,
-		StateRoot:     stateRoot,
-		ReceiptsRoot:  receiptsRoot,
-		LogsBloom:     logsBloom,
-		PrevRandao:    prevRandao,
-		BlockNumber:   1,
-		GasLimit:      1,
-		GasUsed:       1,
-		Timestamp:     1,
-		ExtraData:     extraData,
-		BaseFeePerGas: bfpg.SSZBytes(),
-		BlockHash:     blockHash,
-		Transactions:  txList,
-		Withdrawals: []*v1.Withdrawal{
-			{
-				Index:          1,
-				ValidatorIndex: 1,
-				Address:        address,
-				Amount:         1,
-			},
-		},
-	}
-	require.DeepEqual(t, expected, p)
-
-}
-
 func pbEth1Data() *eth.Eth1Data {
 	return &eth.Eth1Data{
 		DepositRoot:  make([]byte, 32),
@@ -984,8 +581,7 @@ func TestProposerSlashings(t *testing.T) {
 }

 func pbExecutionPayloadHeader(t *testing.T) *v1.ExecutionPayloadHeader {
-	bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
+	bfpg := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
 	return &v1.ExecutionPayloadHeader{
 		ParentHash:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
 		FeeRecipient:     ezDecode(t, "0xabcf8e0d4e9587369b2301d0790347320302cc09"),
@@ -1004,28 +600,6 @@ func pbExecutionPayloadHeader(t *testing.T) *v1.ExecutionPayloadHeader {
 	}
 }

-func pbExecutionPayloadHeaderCapella(t *testing.T) *v1.ExecutionPayloadHeaderCapella {
-	bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
-	return &v1.ExecutionPayloadHeaderCapella{
-		ParentHash:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		FeeRecipient:     ezDecode(t, "0xabcf8e0d4e9587369b2301d0790347320302cc09"),
-		StateRoot:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		ReceiptsRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		LogsBloom:        ezDecode(t, "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
-		PrevRandao:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		BlockNumber:      1,
-		GasLimit:         1,
-		GasUsed:          1,
-		Timestamp:        1,
-		ExtraData:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		BaseFeePerGas:    bfpg.SSZBytes(),
-		BlockHash:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		TransactionsRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		WithdrawalsRoot:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-	}
-}
-
 func TestExecutionPayloadHeader_MarshalJSON(t *testing.T) {
 	h := &ExecutionPayloadHeader{
 		ExecutionPayloadHeader: pbExecutionPayloadHeader(t),
@@ -1036,16 +610,6 @@ func TestExecutionPayloadHeader_MarshalJSON(t *testing.T) {
 	require.Equal(t, expected, string(b))
 }

-func TestExecutionPayloadHeaderCapella_MarshalJSON(t *testing.T) {
-	h := &ExecutionPayloadHeaderCapella{
-		ExecutionPayloadHeaderCapella: pbExecutionPayloadHeaderCapella(t),
-	}
-	b, err := json.Marshal(h)
-	require.NoError(t, err)
-	expected := `{"parent_hash":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","fee_recipient":"0xabcf8e0d4e9587369b2301d0790347320302cc09","state_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","receipts_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","logs_bloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","prev_randao":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","block_number":"1","gas_limit":"1","gas_used":"1","timestamp":"1","extra_data":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","base_fee_per_gas":"452312848583266388373324160190187140051835877600158453279131187530910662656","block_hash":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","transactions_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","withdrawals_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}`
-	require.Equal(t, expected, string(b))
-}
-
 var testBuilderBid = `{
    "version":"bellatrix",
 	"data":{
@@ -1097,49 +661,6 @@ func TestMathBigUnmarshal(t *testing.T) {
 	require.NoError(t, u256.UnmarshalText([]byte("452312848583266388373324160190187140051835877600158453279131187530910662656")))
 }

-func TestIsValidUint256(t *testing.T) {
-	value, ok := new(big.Int), false
-
-	// negative uint256.max - 1
-	_, ok = value.SetString("-10000000000000000000000000000000000000000000000000000000000000000", 16)
-	require.Equal(t, true, ok)
-	require.Equal(t, 257, value.BitLen())
-	require.Equal(t, false, isValidUint256(value))
-
-	// negative uint256.max
-	_, ok = value.SetString("-ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16)
-	require.Equal(t, true, ok)
-	require.Equal(t, 256, value.BitLen())
-	require.Equal(t, false, isValidUint256(value))
-
-	// negative number
-	_, ok = value.SetString("-1", 16)
-	require.Equal(t, true, ok)
-	require.Equal(t, false, isValidUint256(value))
-
-	// uint256.min
-	_, ok = value.SetString("0", 16)
-	require.Equal(t, true, ok)
-	require.Equal(t, true, isValidUint256(value))
-
-	// positive number
-	_, ok = value.SetString("1", 16)
-	require.Equal(t, true, ok)
-	require.Equal(t, true, isValidUint256(value))
-
-	// uint256.max
-	_, ok = value.SetString("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16)
-	require.Equal(t, true, ok)
-	require.Equal(t, 256, value.BitLen())
-	require.Equal(t, true, isValidUint256(value))
-
-	// uint256.max + 1
-	_, ok = value.SetString("10000000000000000000000000000000000000000000000000000000000000000", 16)
-	require.Equal(t, true, ok)
-	require.Equal(t, 257, value.BitLen())
-	require.Equal(t, false, isValidUint256(value))
-}
-
 func TestUint256Unmarshal(t *testing.T) {
 	base10 := "452312848583266388373324160190187140051835877600158453279131187530910662656"
 	bi := new(big.Int)
@@ -1156,36 +677,6 @@ func TestUint256Unmarshal(t *testing.T) {
 	require.Equal(t, expected, string(m))
 }

-func TestUint256UnmarshalNegative(t *testing.T) {
-	m := "-1"
-	var value Uint256
-	err := value.UnmarshalText([]byte(m))
-	require.ErrorContains(t, "unable to decode into Uint256", err)
-}
-
-func TestUint256UnmarshalMin(t *testing.T) {
-	m := "0"
-	var value Uint256
-	err := value.UnmarshalText([]byte(m))
-	require.NoError(t, err)
-}
-
-func TestUint256UnmarshalMax(t *testing.T) {
-	// 2**256-1 (uint256.max)
-	m := "115792089237316195423570985008687907853269984665640564039457584007913129639935"
-	var value Uint256
-	err := value.UnmarshalText([]byte(m))
-	require.NoError(t, err)
-}
-
-func TestUint256UnmarshalTooBig(t *testing.T) {
-	// 2**256 (one more than uint256.max)
-	m := "115792089237316195423570985008687907853269984665640564039457584007913129639936"
-	var value Uint256
-	err := value.UnmarshalText([]byte(m))
-	require.ErrorContains(t, "unable to decode into Uint256", err)
-}
-
 func TestMarshalBlindedBeaconBlockBodyBellatrix(t *testing.T) {
 	expected, err := os.ReadFile("testdata/blinded-block.json")
 	require.NoError(t, err)
@@ -1215,43 +706,12 @@ func TestMarshalBlindedBeaconBlockBodyBellatrix(t *testing.T) {
 	require.Equal(t, string(expected[0:len(expected)-1]), string(m))
 }

-func TestMarshalBlindedBeaconBlockBodyCapella(t *testing.T) {
-	expected, err := os.ReadFile("testdata/blinded-block-capella.json")
-	require.NoError(t, err)
-	b := &BlindedBeaconBlockCapella{BlindedBeaconBlockCapella: &eth.BlindedBeaconBlockCapella{
-		Slot:          1,
-		ProposerIndex: 1,
-		ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		StateRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		Body: &eth.BlindedBeaconBlockBodyCapella{
-			RandaoReveal:           ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-			Eth1Data:               pbEth1Data(),
-			Graffiti:               ezDecode(t, "0xdeadbeefc0ffee"),
-			ProposerSlashings:      []*eth.ProposerSlashing{pbProposerSlashing(t)},
-			AttesterSlashings:      []*eth.AttesterSlashing{pbAttesterSlashing(t)},
-			Attestations:           []*eth.Attestation{pbAttestation(t)},
-			Deposits:               []*eth.Deposit{pbDeposit(t)},
-			VoluntaryExits:         []*eth.SignedVoluntaryExit{pbSignedVoluntaryExit(t)},
-			SyncAggregate:          pbSyncAggregate(),
-			ExecutionPayloadHeader: pbExecutionPayloadHeaderCapella(t),
-		},
-	}}
-	m, err := json.Marshal(b)
-	require.NoError(t, err)
-	// string error output is easier to deal with
-	// -1 end slice index on expected is to get rid of trailing newline
-	// if you update this fixture and this test breaks, you probably removed the trailing newline
-	require.Equal(t, string(expected[0:len(expected)-1]), string(m))
-}
-
 func TestRoundTripUint256(t *testing.T) {
 	vs := "4523128485832663883733241601901871400518358776001584532791311875309106626"
-	u, err := stringToUint256(vs)
-	require.NoError(t, err)
+	u := stringToUint256(vs)
 	sb := u.SSZBytes()
 	require.Equal(t, 32, len(sb))
-	uu, err := sszBytesToUint256(sb)
-	require.NoError(t, err)
+	uu := sszBytesToUint256(sb)
 	require.Equal(t, true, bytes.Equal(u.SSZBytes(), uu.SSZBytes()))
 	require.Equal(t, vs, uu.String())
 }
@@ -1279,16 +739,6 @@ func TestExecutionPayloadHeaderRoundtrip(t *testing.T) {
 	require.DeepEqual(t, string(expected[0:len(expected)-1]), string(m))
 }

-func TestExecutionPayloadHeaderCapellaRoundtrip(t *testing.T) {
-	expected, err := os.ReadFile("testdata/execution-payload-capella.json")
-	require.NoError(t, err)
-	hu := &ExecutionPayloadHeaderCapella{}
-	require.NoError(t, json.Unmarshal(expected, hu))
-	m, err := json.Marshal(hu)
-	require.NoError(t, err)
-	require.DeepEqual(t, string(expected[0:len(expected)-1]), string(m))
-}
-
 func TestErrorMessage_non200Err(t *testing.T) {
 	mockRequest := &http.Request{
 		URL: &url.URL{Path: "example.com"},
@@ -1375,4 +825,5 @@ func TestErrorMessage_non200Err(t *testing.T) {
 			}
 		})
 	}
+
 }
--- a/async/multilock.go
+++ b/async/multilock.go
@@ -3,9 +3,7 @@ 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
@@ -3,9 +3,7 @@ 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
@@ -51,9 +51,9 @@ go_library(
        "//beacon-chain/execution:go_default_library",
        "//beacon-chain/forkchoice:go_default_library",
        "//beacon-chain/forkchoice/doubly-linked-tree:go_default_library",
+        "//beacon-chain/forkchoice/protoarray: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",
@@ -64,7 +64,6 @@ 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",
@@ -133,8 +132,9 @@ go_test(
        "//beacon-chain/execution/testing:go_default_library",
        "//beacon-chain/forkchoice/types:go_default_library",
        "//beacon-chain/p2p:go_default_library",
-        "//beacon-chain/state/state-native:go_default_library",
        "//beacon-chain/state/stateutil:go_default_library",
+        "//beacon-chain/state/v1:go_default_library",
+        "//beacon-chain/state/v3:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/blocks:go_default_library",
--- a/beacon-chain/blockchain/chain_info.go
+++ b/beacon-chain/blockchain/chain_info.go
@@ -5,15 +5,15 @@ import (
 	"context"
 	"time"

-	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/doubly-linked-tree"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/protoarray"
 	"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/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
@@ -39,7 +39,7 @@ type HeadUpdater interface {
 // TimeFetcher retrieves the Ethereum consensus data that's related to time.
 type TimeFetcher interface {
 	GenesisTime() time.Time
-	CurrentSlot() primitives.Slot
+	CurrentSlot() types.Slot
 }

 // GenesisFetcher retrieves the Ethereum consensus data related to its genesis.
@@ -50,16 +50,16 @@ type GenesisFetcher interface {
 // HeadFetcher defines a common interface for methods in blockchain service which
 // directly retrieve head related data.
 type HeadFetcher interface {
-	HeadSlot() primitives.Slot
+	HeadSlot() types.Slot
 	HeadRoot(ctx context.Context) ([]byte, error)
 	HeadBlock(ctx context.Context) (interfaces.SignedBeaconBlock, error)
 	HeadState(ctx context.Context) (state.BeaconState, error)
-	HeadValidatorsIndices(ctx context.Context, epoch primitives.Epoch) ([]primitives.ValidatorIndex, error)
+	HeadValidatorsIndices(ctx context.Context, epoch types.Epoch) ([]types.ValidatorIndex, error)
 	HeadGenesisValidatorsRoot() [32]byte
 	HeadETH1Data() *ethpb.Eth1Data
-	HeadPublicKeyToValidatorIndex(pubKey [fieldparams.BLSPubkeyLength]byte) (primitives.ValidatorIndex, bool)
-	HeadValidatorIndexToPublicKey(ctx context.Context, index primitives.ValidatorIndex) ([fieldparams.BLSPubkeyLength]byte, error)
-	ChainHeads() ([][32]byte, []primitives.Slot)
+	HeadPublicKeyToValidatorIndex(pubKey [fieldparams.BLSPubkeyLength]byte) (types.ValidatorIndex, bool)
+	HeadValidatorIndexToPublicKey(ctx context.Context, index types.ValidatorIndex) ([fieldparams.BLSPubkeyLength]byte, error)
+	ChainHeads() ([][32]byte, []types.Slot)
 	HeadSyncCommitteeFetcher
 	HeadDomainFetcher
 }
@@ -118,7 +118,7 @@ func (s *Service) BestJustifiedCheckpt() *ethpb.Checkpoint {
 }

 // HeadSlot returns the slot of the head of the chain.
-func (s *Service) HeadSlot() primitives.Slot {
+func (s *Service) HeadSlot() types.Slot {
 	s.headLock.RLock()
 	defer s.headLock.RUnlock()

@@ -188,12 +188,12 @@ func (s *Service) HeadState(ctx context.Context) (state.BeaconState, error) {
 }

 // HeadValidatorsIndices returns a list of active validator indices from the head view of a given epoch.
-func (s *Service) HeadValidatorsIndices(ctx context.Context, epoch primitives.Epoch) ([]primitives.ValidatorIndex, error) {
+func (s *Service) HeadValidatorsIndices(ctx context.Context, epoch types.Epoch) ([]types.ValidatorIndex, error) {
 	s.headLock.RLock()
 	defer s.headLock.RUnlock()

 	if !s.hasHeadState() {
-		return []primitives.ValidatorIndex{}, nil
+		return []types.ValidatorIndex{}, nil
 	}
 	return helpers.ActiveValidatorIndices(ctx, s.headState(ctx), epoch)
 }
@@ -265,12 +265,12 @@ func (s *Service) IsCanonical(ctx context.Context, blockRoot [32]byte) (bool, er

 // ChainHeads returns all possible chain heads (leaves of fork choice tree).
 // Heads roots and heads slots are returned.
-func (s *Service) ChainHeads() ([][32]byte, []primitives.Slot) {
+func (s *Service) ChainHeads() ([][32]byte, []types.Slot) {
 	return s.cfg.ForkChoiceStore.Tips()
 }

 // HeadPublicKeyToValidatorIndex returns the validator index of the `pubkey` in current head state.
-func (s *Service) HeadPublicKeyToValidatorIndex(pubKey [fieldparams.BLSPubkeyLength]byte) (primitives.ValidatorIndex, bool) {
+func (s *Service) HeadPublicKeyToValidatorIndex(pubKey [fieldparams.BLSPubkeyLength]byte) (types.ValidatorIndex, bool) {
 	s.headLock.RLock()
 	defer s.headLock.RUnlock()
 	if !s.hasHeadState() {
@@ -280,7 +280,7 @@ func (s *Service) HeadPublicKeyToValidatorIndex(pubKey [fieldparams.BLSPubkeyLen
 }

 // HeadValidatorIndexToPublicKey returns the pubkey of the validator `index`  in current head state.
-func (s *Service) HeadValidatorIndexToPublicKey(_ context.Context, index primitives.ValidatorIndex) ([fieldparams.BLSPubkeyLength]byte, error) {
+func (s *Service) HeadValidatorIndexToPublicKey(_ context.Context, index types.ValidatorIndex) ([fieldparams.BLSPubkeyLength]byte, error) {
 	s.headLock.RLock()
 	defer s.headLock.RUnlock()
 	if !s.hasHeadState() {
@@ -314,7 +314,7 @@ func (s *Service) IsOptimistic(ctx context.Context) (bool, error) {
 	if err == nil {
 		return optimistic, nil
 	}
-	if !errors.Is(err, doublylinkedtree.ErrNilNode) {
+	if err != protoarray.ErrUnknownNodeRoot && err != doublylinkedtree.ErrNilNode {
 		return true, err
 	}
 	// If fockchoice does not have the headroot, then the node is considered
@@ -328,11 +328,6 @@ 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)
 }

@@ -343,7 +338,7 @@ func (s *Service) IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool,
 	if err == nil {
 		return optimistic, nil
 	}
-	if !errors.Is(err, doublylinkedtree.ErrNilNode) {
+	if err != protoarray.ErrUnknownNodeRoot && err != doublylinkedtree.ErrNilNode {
 		return false, err
 	}
 	// if the requested root is the headroot and the root is not found in
--- a/beacon-chain/blockchain/chain_info_norace_test.go
+++ b/beacon-chain/blockchain/chain_info_norace_test.go
@@ -5,10 +5,8 @@ import (
 	"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/state/stategen"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 	"github.com/prysmaticlabs/prysm/v3/testing/util"
@@ -34,7 +32,7 @@ func TestHeadSlot_DataRace(t *testing.T) {
 func TestHeadRoot_DataRace(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	s := &Service{
-		cfg:  &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB, doublylinkedtree.New())},
+		cfg:  &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB)},
 		head: &head{root: [32]byte{'A'}},
 	}
 	b, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
@@ -56,7 +54,7 @@ func TestHeadBlock_DataRace(t *testing.T) {
 	wsb, err := blocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}}})
 	require.NoError(t, err)
 	s := &Service{
-		cfg:  &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB, doublylinkedtree.New())},
+		cfg:  &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB)},
 		head: &head{block: wsb},
 	}
 	b, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
@@ -76,15 +74,12 @@ func TestHeadBlock_DataRace(t *testing.T) {
 func TestHeadState_DataRace(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	s := &Service{
-		cfg: &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB, doublylinkedtree.New())},
+		cfg: &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB)},
 	}
 	b, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
 	require.NoError(t, err)
 	wait := make(chan struct{})
 	st, _ := util.DeterministicGenesisState(t, 1)
-	root := bytesutil.ToBytes32(bytesutil.PadTo([]byte{'s'}, 32))
-	require.NoError(t, beaconDB.SaveGenesisBlockRoot(context.Background(), root))
-	require.NoError(t, beaconDB.SaveState(context.Background(), st, root))
 	go func() {
 		defer close(wait)
 		require.NoError(t, s.saveHead(context.Background(), [32]byte{}, b, st))
--- a/beacon-chain/blockchain/chain_info_test.go
+++ b/beacon-chain/blockchain/chain_info_test.go
@@ -7,14 +7,16 @@ import (

 	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/forkchoice/protoarray"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/types"
 	"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"
+	v1 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v1"
+	v3 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v3"
 	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/primitives"
+	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"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
@@ -33,7 +35,7 @@ var _ ForkFetcher = (*Service)(nil)
 // insert into forkchoice
 func prepareForkchoiceState(
 	_ context.Context,
-	slot primitives.Slot,
+	slot types.Slot,
 	blockRoot [32]byte,
 	parentRoot [32]byte,
 	payloadHash [32]byte,
@@ -59,7 +61,7 @@ func prepareForkchoiceState(
 	}

 	base.BlockRoots[0] = append(base.BlockRoots[0], blockRoot[:]...)
-	st, err := state_native.InitializeFromProtoBellatrix(base)
+	st, err := v3.InitializeFromProto(base)
 	return st, blockRoot, err
 }

@@ -74,7 +76,7 @@ func TestHeadRoot_Nil(t *testing.T) {
 func TestService_ForkChoiceStore(t *testing.T) {
 	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}}
 	p := c.ForkChoiceStore()
-	require.Equal(t, primitives.Epoch(0), p.FinalizedCheckpoint().Epoch)
+	require.Equal(t, types.Epoch(0), p.FinalizedCheckpoint().Epoch)
 }

 func TestFinalizedCheckpt_GenesisRootOk(t *testing.T) {
@@ -84,7 +86,7 @@ func TestFinalizedCheckpt_GenesisRootOk(t *testing.T) {
 	opts := []Option{
 		WithDatabase(beaconDB),
 		WithForkChoiceStore(fcs),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
@@ -109,7 +111,7 @@ func TestCurrentJustifiedCheckpt_CanRetrieve(t *testing.T) {
 	opts := []Option{
 		WithDatabase(beaconDB),
 		WithForkChoiceStore(fcs),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
@@ -123,13 +125,10 @@ func TestCurrentJustifiedCheckpt_CanRetrieve(t *testing.T) {

 func TestHeadSlot_CanRetrieve(t *testing.T) {
 	c := &Service{}
-	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{})
+	s, err := v1.InitializeFromProto(&ethpb.BeaconState{})
 	require.NoError(t, err)
-	b, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
-	require.NoError(t, err)
-	b.Block().SetSlot(100)
-	c.head = &head{block: b, state: s}
-	assert.Equal(t, primitives.Slot(100), c.HeadSlot())
+	c.head = &head{slot: 100, state: s}
+	assert.Equal(t, types.Slot(100), c.HeadSlot())
 }

 func TestHeadRoot_CanRetrieve(t *testing.T) {
@@ -139,7 +138,7 @@ func TestHeadRoot_CanRetrieve(t *testing.T) {
 	opts := []Option{
 		WithDatabase(beaconDB),
 		WithForkChoiceStore(fcs),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
@@ -158,7 +157,7 @@ func TestHeadRoot_UseDB(t *testing.T) {
 	opts := []Option{
 		WithDatabase(beaconDB),
 		WithForkChoiceStore(fcs),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
@@ -180,7 +179,7 @@ func TestHeadRoot_UseDB(t *testing.T) {
 func TestHeadBlock_CanRetrieve(t *testing.T) {
 	b := util.NewBeaconBlock()
 	b.Block.Slot = 1
-	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{})
+	s, err := v1.InitializeFromProto(&ethpb.BeaconState{})
 	require.NoError(t, err)
 	wsb, err := blocks.NewSignedBeaconBlock(b)
 	require.NoError(t, err)
@@ -195,13 +194,13 @@ func TestHeadBlock_CanRetrieve(t *testing.T) {
 }

 func TestHeadState_CanRetrieve(t *testing.T) {
-	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{Slot: 2, GenesisValidatorsRoot: params.BeaconConfig().ZeroHash[:]})
+	s, err := v1.InitializeFromProto(&ethpb.BeaconState{Slot: 2, GenesisValidatorsRoot: params.BeaconConfig().ZeroHash[:]})
 	require.NoError(t, err)
 	c := &Service{}
 	c.head = &head{state: s}
 	headState, err := c.HeadState(context.Background())
 	require.NoError(t, err)
-	assert.DeepEqual(t, headState.ToProtoUnsafe(), s.ToProtoUnsafe(), "Incorrect head state received")
+	assert.DeepEqual(t, headState.InnerStateUnsafe(), s.InnerStateUnsafe(), "Incorrect head state received")
 }

 func TestGenesisTime_CanRetrieve(t *testing.T) {
@@ -212,7 +211,7 @@ func TestGenesisTime_CanRetrieve(t *testing.T) {

 func TestCurrentFork_CanRetrieve(t *testing.T) {
 	f := &ethpb.Fork{Epoch: 999}
-	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{Fork: f})
+	s, err := v1.InitializeFromProto(&ethpb.BeaconState{Fork: f})
 	require.NoError(t, err)
 	c := &Service{}
 	c.head = &head{state: s}
@@ -237,7 +236,7 @@ func TestGenesisValidatorsRoot_CanRetrieve(t *testing.T) {
 	c := &Service{}
 	assert.Equal(t, [32]byte{}, c.GenesisValidatorsRoot(), "Did not get correct genesis validators root")

-	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{GenesisValidatorsRoot: []byte{'a'}})
+	s, err := v1.InitializeFromProto(&ethpb.BeaconState{GenesisValidatorsRoot: []byte{'a'}})
 	require.NoError(t, err)
 	c.head = &head{state: s}
 	assert.Equal(t, [32]byte{'a'}, c.GenesisValidatorsRoot(), "Did not get correct genesis validators root")
@@ -251,7 +250,7 @@ func TestHeadETH1Data_Nil(t *testing.T) {

 func TestHeadETH1Data_CanRetrieve(t *testing.T) {
 	d := &ethpb.Eth1Data{DepositCount: 999}
-	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{Eth1Data: d})
+	s, err := v1.InitializeFromProto(&ethpb.BeaconState{Eth1Data: d})
 	require.NoError(t, err)
 	c := &Service{}
 	c.head = &head{state: s}
@@ -307,22 +306,12 @@ func TestService_HeadGenesisValidatorsRoot(t *testing.T) {
 	root = c.HeadGenesisValidatorsRoot()
 	require.DeepEqual(t, root[:], s.GenesisValidatorsRoot())
 }
-
-//
-//  A <- B <- C
-//   \    \
-//    \    ---------- E
-//     ---------- D
-
-func TestService_ChainHeads(t *testing.T) {
+func TestService_ChainHeads_ProtoArray(t *testing.T) {
 	ctx := context.Background()
-	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}}
+	c := &Service{cfg: &config{ForkChoiceStore: protoarray.New()}}
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [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, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
+	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)
@@ -338,9 +327,44 @@ func TestService_ChainHeads(t *testing.T) {
 	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
+//   \    \
+//    \    ---------- E
+//     ---------- D
+
+func TestService_ChainHeads_DoublyLinkedTree(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, 0, [32]byte{}, [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, 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{}, 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.Equal(t, 3, len(roots))
-	rootMap := map[[32]byte]primitives.Slot{{'c'}: 102, {'d'}: 103, {'e'}: 104}
+	rootMap := map[[32]byte]types.Slot{{'c'}: 102, {'d'}: 103, {'e'}: 104}
 	for i, root := range roots {
 		slot, ok := rootMap[root]
 		require.Equal(t, true, ok)
@@ -361,7 +385,7 @@ func TestService_HeadPublicKeyToValidatorIndex(t *testing.T) {

 	i, e := c.HeadPublicKeyToValidatorIndex(bytesutil.ToBytes48(v.PublicKey))
 	require.Equal(t, true, e)
-	require.Equal(t, primitives.ValidatorIndex(0), i)
+	require.Equal(t, types.ValidatorIndex(0), i)
 }

 func TestService_HeadPublicKeyToValidatorIndexNil(t *testing.T) {
@@ -370,12 +394,12 @@ func TestService_HeadPublicKeyToValidatorIndexNil(t *testing.T) {

 	idx, e := c.HeadPublicKeyToValidatorIndex([fieldparams.BLSPubkeyLength]byte{})
 	require.Equal(t, false, e)
-	require.Equal(t, primitives.ValidatorIndex(0), idx)
+	require.Equal(t, types.ValidatorIndex(0), idx)

 	c.head = &head{state: nil}
 	i, e := c.HeadPublicKeyToValidatorIndex([fieldparams.BLSPubkeyLength]byte{})
 	require.Equal(t, false, e)
-	require.Equal(t, primitives.ValidatorIndex(0), i)
+	require.Equal(t, types.ValidatorIndex(0), i)
 }

 func TestService_HeadValidatorIndexToPublicKey(t *testing.T) {
@@ -406,7 +430,29 @@ func TestService_HeadValidatorIndexToPublicKeyNil(t *testing.T) {
 	require.Equal(t, [fieldparams.BLSPubkeyLength]byte{}, p)
 }

-func TestService_IsOptimistic(t *testing.T) {
+func TestService_IsOptimistic_ProtoArray(t *testing.T) {
+	params.SetupTestConfigCleanup(t)
+	cfg := params.BeaconConfig()
+	cfg.BellatrixForkEpoch = 0
+	params.OverrideBeaconConfig(cfg)
+
+	ctx := context.Background()
+	c := &Service{cfg: &config{ForkChoiceStore: protoarray.New()}, head: &head{slot: 101, 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)
+	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))
+
+	opt, err := c.IsOptimistic(ctx)
+	require.NoError(t, err)
+	require.Equal(t, true, opt)
+}
+
+func TestService_IsOptimistic_DoublyLinkedTree(t *testing.T) {
 	params.SetupTestConfigCleanup(t)
 	cfg := params.BeaconConfig()
 	cfg.BellatrixForkEpoch = 0
@@ -415,7 +461,7 @@ 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{root: [32]byte{'b'}}}
+	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{slot: 101, 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))
@@ -436,9 +482,9 @@ func TestService_IsOptimisticBeforeBellatrix(t *testing.T) {
 	require.Equal(t, false, opt)
 }

-func TestService_IsOptimisticForRoot(t *testing.T) {
+func TestService_IsOptimisticForRoot_ProtoArray(t *testing.T) {
 	ctx := context.Background()
-	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{root: [32]byte{'b'}}}
+	c := &Service{cfg: &config{ForkChoiceStore: protoarray.New()}, head: &head{slot: 101, 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)
@@ -453,10 +499,86 @@ func TestService_IsOptimisticForRoot(t *testing.T) {
 	require.Equal(t, true, opt)
 }

-func TestService_IsOptimisticForRoot_DB(t *testing.T) {
+func TestService_IsOptimisticForRoot_DoublyLinkedTree(t *testing.T) {
+	ctx := context.Background()
+	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{slot: 101, 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)
+	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))
+
+	opt, err := c.IsOptimisticForRoot(ctx, [32]byte{'a'})
+	require.NoError(t, err)
+	require.Equal(t, true, opt)
+}
+
+func TestService_IsOptimisticForRoot_DB_ProtoArray(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	ctx := context.Background()
-	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: doublylinkedtree.New()}, head: &head{root: [32]byte{'b'}}}
+	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: protoarray.New()}, head: &head{slot: 101, root: [32]byte{'b'}}}
+	c.head = &head{root: params.BeaconConfig().ZeroHash}
+	b := util.NewBeaconBlock()
+	b.Block.Slot = 10
+	br, err := b.Block.HashTreeRoot()
+	require.NoError(t, err)
+	util.SaveBlock(t, context.Background(), beaconDB, b)
+	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: br[:], Slot: 10}))
+
+	optimisticBlock := util.NewBeaconBlock()
+	optimisticBlock.Block.Slot = 97
+	optimisticRoot, err := optimisticBlock.Block.HashTreeRoot()
+	require.NoError(t, err)
+	util.SaveBlock(t, context.Background(), beaconDB, optimisticBlock)
+
+	validatedBlock := util.NewBeaconBlock()
+	validatedBlock.Block.Slot = 9
+	validatedRoot, err := validatedBlock.Block.HashTreeRoot()
+	require.NoError(t, err)
+	util.SaveBlock(t, context.Background(), beaconDB, validatedBlock)
+
+	validatedCheckpoint := &ethpb.Checkpoint{Root: br[:]}
+	require.NoError(t, beaconDB.SaveLastValidatedCheckpoint(ctx, validatedCheckpoint))
+
+	_, err = c.IsOptimisticForRoot(ctx, optimisticRoot)
+	require.ErrorContains(t, "nil summary returned from the DB", err)
+
+	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: optimisticRoot[:], Slot: 11}))
+	optimistic, err := c.IsOptimisticForRoot(ctx, optimisticRoot)
+	require.NoError(t, err)
+	require.Equal(t, true, optimistic)
+
+	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: validatedRoot[:], Slot: 9}))
+	cp := &ethpb.Checkpoint{
+		Epoch: 1,
+		Root:  validatedRoot[:],
+	}
+	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, validatedRoot))
+	require.NoError(t, beaconDB.SaveFinalizedCheckpoint(ctx, cp))
+
+	validated, err := c.IsOptimisticForRoot(ctx, validatedRoot)
+	require.NoError(t, err)
+	require.Equal(t, false, validated)
+
+	// Before the first finalized epoch, finalized root could be zeros.
+	validatedCheckpoint = &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, br))
+	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: params.BeaconConfig().ZeroHash[:], Slot: 10}))
+	require.NoError(t, beaconDB.SaveLastValidatedCheckpoint(ctx, validatedCheckpoint))
+
+	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: optimisticRoot[:], Slot: 11}))
+	optimistic, err = c.IsOptimisticForRoot(ctx, optimisticRoot)
+	require.NoError(t, err)
+	require.Equal(t, true, optimistic)
+}
+
+func TestService_IsOptimisticForRoot_DB_DoublyLinkedTree(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.head = &head{root: params.BeaconConfig().ZeroHash}
 	b := util.NewBeaconBlock()
 	b.Block.Slot = 10
@@ -514,7 +636,7 @@ 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{root: [32]byte{'b'}}}
+	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: doublylinkedtree.New()}, head: &head{slot: 101, 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
@@ -8,17 +8,19 @@ 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 execution engine error")
+	ErrUndefinedExecutionEngineError = errors.New("received an undefined ee 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 justified checkpoint returned from state")
+	errNilJustifiedCheckpoint = errors.New("nil finalized 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
@@ -15,11 +15,9 @@ 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"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	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"
@@ -69,7 +67,11 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 	}

 	nextSlot := s.CurrentSlot() + 1 // Cache payload ID for next slot proposer.
-	hasAttr, attr, proposerId := s.getPayloadAttribute(ctx, arg.headState, nextSlot)
+	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
+	}

 	payloadID, lastValidHash, err := s.cfg.ExecutionEngineCaller.ForkchoiceUpdated(ctx, fcs, attr)
 	if err != nil {
@@ -81,6 +83,10 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 				"headPayloadBlockHash":      fmt.Sprintf("%#x", bytesutil.Trunc(headPayload.BlockHash())),
 				"finalizedPayloadBlockHash": fmt.Sprintf("%#x", bytesutil.Trunc(finalizedHash[:])),
 			}).Info("Called fork choice updated with optimistic block")
+			err := s.optimisticCandidateBlock(ctx, headBlk)
+			if err != nil {
+				log.WithError(err).Error("Optimistic block failed to be candidate")
+			}
 			return payloadID, nil
 		case execution.ErrInvalidPayloadStatus:
 			forkchoiceUpdatedInvalidNodeCount.Inc()
@@ -88,7 +94,7 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 			if len(lastValidHash) == 0 {
 				lastValidHash = defaultLatestValidHash
 			}
-			invalidRoots, err := s.ForkChoicer().SetOptimisticToInvalid(ctx, headRoot, headBlk.ParentRoot(), bytesutil.ToBytes32(lastValidHash))
+			invalidRoots, err := s.ForkChoicer().SetOptimisticToInvalid(ctx, headRoot, bytesutil.ToBytes32(headBlk.ParentRoot()), bytesutil.ToBytes32(lastValidHash))
 			if err != nil {
 				log.WithError(err).Error("Could not set head root to invalid")
 				return nil, nil
@@ -101,9 +107,9 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 			r, err := s.cfg.ForkChoiceStore.Head(ctx, s.justifiedBalances.balances)
 			if err != nil {
 				log.WithFields(logrus.Fields{
-					"slot":                 headBlk.Slot(),
-					"blockRoot":            fmt.Sprintf("%#x", bytesutil.Trunc(headRoot[:])),
-					"invalidChildrenCount": len(invalidRoots),
+					"slot":         headBlk.Slot(),
+					"blockRoot":    fmt.Sprintf("%#x", bytesutil.Trunc(headRoot[:])),
+					"invalidCount": len(invalidRoots),
 				}).Warn("Pruned invalid blocks, could not update head root")
 				return nil, invalidBlock{error: ErrInvalidPayload, root: arg.headRoot, invalidAncestorRoots: invalidRoots}
 			}
@@ -131,10 +137,10 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 			}

 			log.WithFields(logrus.Fields{
-				"slot":                 headBlk.Slot(),
-				"blockRoot":            fmt.Sprintf("%#x", bytesutil.Trunc(headRoot[:])),
-				"invalidChildrenCount": len(invalidRoots),
-				"newHeadRoot":          fmt.Sprintf("%#x", bytesutil.Trunc(r[:])),
+				"slot":         headBlk.Slot(),
+				"blockRoot":    fmt.Sprintf("%#x", bytesutil.Trunc(headRoot[:])),
+				"invalidCount": len(invalidRoots),
+				"newHeadRoot":  fmt.Sprintf("%#x", bytesutil.Trunc(r[:])),
 			}).Warn("Pruned invalid blocks")
 			return pid, invalidBlock{error: ErrInvalidPayload, root: arg.headRoot, invalidAncestorRoots: invalidRoots}

@@ -148,8 +154,7 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 		log.WithError(err).Error("Could not set head root to valid")
 		return nil, nil
 	}
-	// If the forkchoice update call has an attribute, update the proposer payload ID cache.
-	if hasAttr && payloadID != nil {
+	if hasAttr && payloadID != nil { // If the forkchoice update call has an attribute, update the proposer payload ID cache.
 		var pId [8]byte
 		copy(pId[:], payloadID[:])
 		s.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(nextSlot, proposerId, pId, arg.headRoot)
@@ -179,10 +184,10 @@ func (s *Service) getPayloadHash(ctx context.Context, root []byte) ([32]byte, er
 	return bytesutil.ToBytes32(payload.BlockHash()), nil
 }

-// notifyNewPayload signals execution engine on a new payload.
+// notifyForkchoiceUpdate 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) {
+	postStateHeader *enginev1.ExecutionPayloadHeader, blk interfaces.SignedBeaconBlock) (bool, error) {
 	ctx, span := trace.StartSpan(ctx, "blockChain.notifyNewPayload")
 	defer span.End()

@@ -217,14 +222,14 @@ func (s *Service) notifyNewPayload(ctx context.Context, postStateVersion int,
 			"slot":             blk.Block().Slot(),
 			"payloadBlockHash": fmt.Sprintf("%#x", bytesutil.Trunc(payload.BlockHash())),
 		}).Info("Called new payload with optimistic block")
-		return false, nil
+		return false, s.optimisticCandidateBlock(ctx, blk.Block())
 	case execution.ErrInvalidPayloadStatus:
 		newPayloadInvalidNodeCount.Inc()
 		root, err := blk.Block().HashTreeRoot()
 		if err != nil {
 			return false, err
 		}
-		invalidRoots, err := s.ForkChoicer().SetOptimisticToInvalid(ctx, root, blk.Block().ParentRoot(), bytesutil.ToBytes32(lastValidHash))
+		invalidRoots, err := s.ForkChoicer().SetOptimisticToInvalid(ctx, root, bytesutil.ToBytes32(blk.Block().ParentRoot()), bytesutil.ToBytes32(lastValidHash))
 		if err != nil {
 			return false, err
 		}
@@ -232,9 +237,9 @@ func (s *Service) notifyNewPayload(ctx context.Context, postStateVersion int,
 			return false, err
 		}
 		log.WithFields(logrus.Fields{
-			"slot":                 blk.Block().Slot(),
-			"blockRoot":            fmt.Sprintf("%#x", root),
-			"invalidChildrenCount": len(invalidRoots),
+			"slot":         blk.Block().Slot(),
+			"blockRoot":    fmt.Sprintf("%#x", root),
+			"invalidCount": len(invalidRoots),
 		}).Warn("Pruned invalid blocks")
 		return false, invalidBlock{
 			invalidAncestorRoots: invalidRoots,
@@ -248,27 +253,55 @@ func (s *Service) notifyNewPayload(ctx context.Context, postStateVersion int,
 	}
 }

+// optimisticCandidateBlock returns an error if this block can't be optimistically synced.
+// It replaces boolean in spec code with `errNotOptimisticCandidate`.
+//
+// Spec pseudocode definition:
+// def is_optimistic_candidate_block(opt_store: OptimisticStore, current_slot: Slot, block: BeaconBlock) -> bool:
+//    if is_execution_block(opt_store.blocks[block.parent_root]):
+//        return True
+//
+//    if block.slot + SAFE_SLOTS_TO_IMPORT_OPTIMISTICALLY <= current_slot:
+//        return True
+//
+//    return False
+func (s *Service) optimisticCandidateBlock(ctx context.Context, blk interfaces.BeaconBlock) error {
+	if blk.Slot()+params.BeaconConfig().SafeSlotsToImportOptimistically <= s.CurrentSlot() {
+		return nil
+	}
+	parent, err := s.getBlock(ctx, bytesutil.ToBytes32(blk.ParentRoot()))
+	if err != nil {
+		return err
+	}
+	parentIsExecutionBlock, err := blocks.IsExecutionBlock(parent.Block().Body())
+	if err != nil {
+		return err
+	}
+	if parentIsExecutionBlock {
+		return nil
+	}
+
+	return errNotOptimisticCandidate
+}
+
 // 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 primitives.Slot) (bool, payloadattribute.Attributer, primitives.ValidatorIndex) {
-	emptyAttri := payloadattribute.EmptyWithVersion(st.Version())
+func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState, slot types.Slot) (bool, *enginev1.PayloadAttributes, types.ValidatorIndex, error) {
 	// 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, emptyAttri, 0
+		return false, nil, 0, nil
 	}

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

 	// Get fee recipient.
@@ -286,8 +319,7 @@ func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState,
 				"Please refer to our documentation for instructions")
 		}
 	case err != nil:
-		log.WithError(err).Error("Could not get fee recipient to get payload attribute")
-		return false, emptyAttri, 0
+		return false, nil, 0, errors.Wrap(err, "could not get fee recipient in db")
 	default:
 		feeRecipient = recipient
 	}
@@ -295,44 +327,14 @@ func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState,
 	// Get timestamp.
 	t, err := slots.ToTime(uint64(s.genesisTime.Unix()), slot)
 	if err != nil {
-		log.WithError(err).Error("Could not get timestamp to get payload attribute")
-		return false, emptyAttri, 0
+		return false, nil, 0, err
 	}
-
-	var attr payloadattribute.Attributer
-	switch st.Version() {
-	case version.Capella:
-		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
+	attr := &enginev1.PayloadAttributes{
+		Timestamp:             uint64(t.Unix()),
+		PrevRandao:            prevRando,
+		SuggestedFeeRecipient: feeRecipient.Bytes(),
 	}
-
-	return true, attr, proposerID
+	return true, attr, proposerID, nil
 }

 // 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
@@ -13,15 +13,15 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/execution"
 	mockExecution "github.com/prysmaticlabs/prysm/v3/beacon-chain/execution/testing"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/doubly-linked-tree"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/protoarray"
 	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"
 	consensusblocks "github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	v1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
@@ -31,70 +31,8 @@ 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) {
+	params.BeaconConfig().SafeSlotsToImportOptimistically = 0
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
 	altairBlk := util.SaveBlock(t, ctx, beaconDB, util.NewBeaconBlockAltair())
@@ -106,17 +44,16 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 	fcs := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 		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)
@@ -262,6 +199,151 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 	}
 }

+//
+//
+//  A <- B <- C <- D
+//       \
+//         ---------- E <- F
+//                     \
+//                       ------ G
+// D is the current head, attestations for F and G come late, both are invalid.
+// We switch recursively to F then G and finally to D.
+//
+// We test:
+// 1. forkchoice removes blocks F and G from the forkchoice implementation
+// 2. forkchoice removes the weights of these blocks
+// 3. the blockchain package calls fcu to obtain heads G -> F -> D.
+
+func Test_NotifyForkchoiceUpdateRecursive_Protoarray(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+
+	// Prepare blocks
+	ba := util.NewBeaconBlockBellatrix()
+	ba.Block.Body.ExecutionPayload.BlockNumber = 1
+	wba := util.SaveBlock(t, ctx, beaconDB, ba)
+	bra, err := wba.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	bb := util.NewBeaconBlockBellatrix()
+	bb.Block.Body.ExecutionPayload.BlockNumber = 2
+	wbb := util.SaveBlock(t, ctx, beaconDB, bb)
+	brb, err := wbb.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	bc := util.NewBeaconBlockBellatrix()
+	bc.Block.Body.ExecutionPayload.BlockNumber = 3
+	wbc := util.SaveBlock(t, ctx, beaconDB, bc)
+	brc, err := wbc.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	bd := util.NewBeaconBlockBellatrix()
+	pd := [32]byte{'D'}
+	bd.Block.Body.ExecutionPayload.BlockHash = pd[:]
+	bd.Block.Body.ExecutionPayload.BlockNumber = 4
+	wbd := util.SaveBlock(t, ctx, beaconDB, bd)
+	brd, err := wbd.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	be := util.NewBeaconBlockBellatrix()
+	pe := [32]byte{'E'}
+	be.Block.Body.ExecutionPayload.BlockHash = pe[:]
+	be.Block.Body.ExecutionPayload.BlockNumber = 5
+	wbe := util.SaveBlock(t, ctx, beaconDB, be)
+	bre, err := wbe.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	bf := util.NewBeaconBlockBellatrix()
+	pf := [32]byte{'F'}
+	bf.Block.Body.ExecutionPayload.BlockHash = pf[:]
+	bf.Block.Body.ExecutionPayload.BlockNumber = 6
+	bf.Block.ParentRoot = bre[:]
+	wbf := util.SaveBlock(t, ctx, beaconDB, bf)
+	brf, err := wbf.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	bg := util.NewBeaconBlockBellatrix()
+	bg.Block.Body.ExecutionPayload.BlockNumber = 7
+	pg := [32]byte{'G'}
+	bg.Block.Body.ExecutionPayload.BlockHash = pg[:]
+	bg.Block.ParentRoot = bre[:]
+	wbg := util.SaveBlock(t, ctx, beaconDB, bg)
+	brg, err := wbg.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	// Insert blocks into forkchoice
+	service := setupBeaconChain(t, beaconDB)
+	fcs := protoarray.New()
+	service.cfg.ForkChoiceStore = fcs
+	service.cfg.ProposerSlotIndexCache = cache.NewProposerPayloadIDsCache()
+
+	service.justifiedBalances.balances = []uint64{50, 100, 200}
+	require.NoError(t, err)
+	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+	state, blkRoot, err = prepareForkchoiceState(ctx, 5, bre, brb, [32]byte{'E'}, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+	state, blkRoot, err = prepareForkchoiceState(ctx, 6, brf, bre, [32]byte{'F'}, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+	state, blkRoot, err = prepareForkchoiceState(ctx, 7, brg, bre, [32]byte{'G'}, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
+
+	// Insert Attestations to D, F and G so that they have higher weight than D
+	// Ensure G is head
+	fcs.ProcessAttestation(ctx, []uint64{0}, brd, 1)
+	fcs.ProcessAttestation(ctx, []uint64{1}, brf, 1)
+	fcs.ProcessAttestation(ctx, []uint64{2}, brg, 1)
+	jc := &forkchoicetypes.Checkpoint{Epoch: 0, Root: bra}
+	require.NoError(t, fcs.UpdateJustifiedCheckpoint(jc))
+	headRoot, err := fcs.Head(ctx, []uint64{50, 100, 200})
+	require.NoError(t, err)
+	require.Equal(t, brg, headRoot)
+
+	// Prepare Engine Mock to return invalid unless head is D, LVH =  E
+	service.cfg.ExecutionEngineCaller = &mockExecution.EngineClient{ErrForkchoiceUpdated: execution.ErrInvalidPayloadStatus, ForkChoiceUpdatedResp: pe[:], OverrideValidHash: [32]byte{'D'}}
+	st, _ := util.DeterministicGenesisState(t, 1)
+	service.head = &head{
+		state: st,
+		block: wba,
+	}
+
+	require.NoError(t, beaconDB.SaveState(ctx, st, bra))
+	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, bra))
+	a := &notifyForkchoiceUpdateArg{
+		headState: st,
+		headBlock: wbg.Block(),
+		headRoot:  brg,
+	}
+	_, err = service.notifyForkchoiceUpdate(ctx, a)
+	require.Equal(t, true, IsInvalidBlock(err))
+	require.Equal(t, brf, InvalidBlockRoot(err))
+
+	// Ensure Head is D
+	headRoot, err = fcs.Head(ctx, service.justifiedBalances.balances)
+	require.NoError(t, err)
+	require.Equal(t, brd, headRoot)
+
+	// Ensure F and G where removed but their parent E wasn't
+	require.Equal(t, false, fcs.HasNode(brf))
+	require.Equal(t, false, fcs.HasNode(brg))
+	require.Equal(t, true, fcs.HasNode(bre))
+}
+
 func Test_NotifyForkchoiceUpdate_NIlLVH(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
@@ -496,7 +578,7 @@ func Test_NotifyNewPayload(t *testing.T) {
 	fcs := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 	}
 	phase0State, _ := util.DeterministicGenesisState(t, 1)
@@ -742,7 +824,7 @@ func Test_NotifyNewPayload_SetOptimisticToValid(t *testing.T) {
 	fcs := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 	}
 	bellatrixState, _ := util.DeterministicGenesisStateBellatrix(t, 2)
@@ -780,86 +862,194 @@ func Test_NotifyNewPayload_SetOptimisticToValid(t *testing.T) {
 	require.Equal(t, true, validated)
 }

+func Test_IsOptimisticCandidateBlock(t *testing.T) {
+	params.SetupTestConfigCleanup(t)
+	params.OverrideBeaconConfig(params.MainnetConfig())
+
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+	fcs := doublylinkedtree.New()
+	opts := []Option{
+		WithDatabase(beaconDB),
+		WithStateGen(stategen.New(beaconDB)),
+		WithForkChoiceStore(fcs),
+	}
+
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+
+	params.BeaconConfig().SafeSlotsToImportOptimistically = 128
+	service.genesisTime = time.Now().Add(-time.Second * 12 * 2 * 128)
+
+	parentBlk := util.NewBeaconBlockBellatrix()
+	wrappedParentBlock, err := consensusblocks.NewSignedBeaconBlock(parentBlk)
+	require.NoError(t, err)
+	parentRoot, err := wrappedParentBlock.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	tests := []struct {
+		name      string
+		blk       interfaces.BeaconBlock
+		justified interfaces.SignedBeaconBlock
+		err       error
+	}{
+		{
+			name: "deep block",
+			blk: func(tt *testing.T) interfaces.BeaconBlock {
+				blk := util.NewBeaconBlockBellatrix()
+				blk.Block.Slot = 1
+				blk.Block.ParentRoot = parentRoot[:]
+				wr, err := consensusblocks.NewBeaconBlock(blk.Block)
+				require.NoError(tt, err)
+				return wr
+			}(t),
+			justified: func(tt *testing.T) interfaces.SignedBeaconBlock {
+				blk := util.NewBeaconBlockBellatrix()
+				blk.Block.Slot = 32
+				blk.Block.ParentRoot = parentRoot[:]
+				wr, err := consensusblocks.NewSignedBeaconBlock(blk)
+				require.NoError(tt, err)
+				return wr
+			}(t),
+			err: nil,
+		},
+		{
+			name: "shallow block, Altair justified chkpt",
+			blk: func(tt *testing.T) interfaces.BeaconBlock {
+				blk := util.NewBeaconBlockAltair()
+				blk.Block.Slot = 200
+				blk.Block.ParentRoot = parentRoot[:]
+				wr, err := consensusblocks.NewBeaconBlock(blk.Block)
+				require.NoError(tt, err)
+				return wr
+			}(t),
+			justified: func(tt *testing.T) interfaces.SignedBeaconBlock {
+				blk := util.NewBeaconBlockAltair()
+				blk.Block.Slot = 32
+				blk.Block.ParentRoot = parentRoot[:]
+				wr, err := consensusblocks.NewSignedBeaconBlock(blk)
+				require.NoError(tt, err)
+				return wr
+			}(t),
+			err: errNotOptimisticCandidate,
+		},
+		{
+			name: "shallow block, Bellatrix justified chkpt without execution",
+			blk: func(tt *testing.T) interfaces.BeaconBlock {
+				blk := util.NewBeaconBlockBellatrix()
+				blk.Block.Slot = 200
+				blk.Block.ParentRoot = parentRoot[:]
+				wr, err := consensusblocks.NewBeaconBlock(blk.Block)
+				require.NoError(tt, err)
+				return wr
+			}(t),
+			justified: func(tt *testing.T) interfaces.SignedBeaconBlock {
+				blk := util.NewBeaconBlockBellatrix()
+				blk.Block.Slot = 32
+				blk.Block.ParentRoot = parentRoot[:]
+				wr, err := consensusblocks.NewSignedBeaconBlock(blk)
+				require.NoError(tt, err)
+				return wr
+			}(t),
+			err: errNotOptimisticCandidate,
+		},
+	}
+	for _, tt := range tests {
+		require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, tt.justified))
+		require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wrappedParentBlock))
+
+		err = service.optimisticCandidateBlock(ctx, tt.blk)
+		if tt.err != nil {
+			require.Equal(t, tt.err.Error(), err.Error())
+		} else {
+			require.NoError(t, err)
+		}
+	}
+}
+
+func Test_IsOptimisticShallowExecutionParent(t *testing.T) {
+	params.SetupTestConfigCleanup(t)
+	params.OverrideBeaconConfig(params.MainnetConfig())
+
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+	opts := []Option{
+		WithDatabase(beaconDB),
+		WithStateGen(stategen.New(beaconDB)),
+	}
+
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+
+	params.BeaconConfig().SafeSlotsToImportOptimistically = 128
+	service.genesisTime = time.Now().Add(-time.Second * 12 * 2 * 128)
+	payload := &v1.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: bytesutil.PadTo([]byte{1, 2, 3, 4}, fieldparams.RootLength),
+		BlockHash:     make([]byte, 32),
+		BlockNumber:   100,
+	}
+	body := &ethpb.BeaconBlockBodyBellatrix{ExecutionPayload: payload}
+	b := &ethpb.BeaconBlockBellatrix{Body: body, Slot: 200}
+	rawSigned := &ethpb.SignedBeaconBlockBellatrix{Block: b}
+	blk := util.HydrateSignedBeaconBlockBellatrix(rawSigned)
+	wr := util.SaveBlock(t, ctx, service.cfg.BeaconDB, blk)
+	blkRoot, err := wr.Block().HashTreeRoot()
+	require.NoError(t, err)
+
+	childBlock := util.NewBeaconBlockBellatrix()
+	childBlock.Block.ParentRoot = blkRoot[:]
+	// shallow block
+	childBlock.Block.Slot = 201
+	wrappedChild := util.SaveBlock(t, ctx, service.cfg.BeaconDB, childBlock)
+	err = service.optimisticCandidateBlock(ctx, wrappedChild.Block())
+	require.NoError(t, err)
+}
+
 func Test_GetPayloadAttribute(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, doublylinkedtree.New())),
+		WithStateGen(stategen.New(beaconDB)),
 		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
 	}

 	// Cache miss
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	st, _ := util.DeterministicGenesisStateBellatrix(t, 1)
-	hasPayload, _, vId := service.getPayloadAttribute(ctx, st, 0)
+	hasPayload, _, vId, err := service.getPayloadAttribute(ctx, nil, 0)
+	require.NoError(t, err)
 	require.Equal(t, false, hasPayload)
-	require.Equal(t, primitives.ValidatorIndex(0), vId)
+	require.Equal(t, types.ValidatorIndex(0), vId)

 	// Cache hit, advance state, no fee recipient
-	suggestedVid := primitives.ValidatorIndex(1)
-	slot := primitives.Slot(1)
+	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 := service.getPayloadAttribute(ctx, st, slot)
+	hasPayload, attr, vId, err := service.getPayloadAttribute(ctx, st, slot)
+	require.NoError(t, err)
 	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, []primitives.ValidatorIndex{suggestedVid}, []common.Address{suggestedAddr}))
+	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)
+	hasPayload, attr, vId, err = service.getPayloadAttribute(ctx, st, slot)
+	require.NoError(t, err)
 	require.Equal(t, true, hasPayload)
 	require.Equal(t, suggestedVid, vId)
-	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, primitives.ValidatorIndex(0), vId)
-
-	// Cache hit, advance state, no fee recipient
-	suggestedVid := primitives.ValidatorIndex(1)
-	slot := primitives.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, []primitives.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))
+	require.Equal(t, suggestedAddr, common.BytesToAddress(attr.SuggestedFeeRecipient))
 }

 func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
@@ -868,8 +1058,8 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {

 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
+	stateGen := stategen.New(beaconDB)
 	fcs := doublylinkedtree.New()
-	stateGen := stategen.New(beaconDB, fcs)
 	opts := []Option{
 		WithDatabase(beaconDB),
 		WithStateGen(stateGen),
@@ -877,7 +1067,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	var genesisStateRoot [32]byte
+	genesisStateRoot := [32]byte{}
 	genesisBlk := blocks.NewGenesisBlock(genesisStateRoot[:])
 	util.SaveBlock(t, ctx, beaconDB, genesisBlk)
 	genesisRoot, err := genesisBlk.Block.HashTreeRoot()
@@ -982,11 +1172,10 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 func TestService_removeInvalidBlockAndState(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
-	fc := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fc)),
-		WithForkChoiceStore(fc),
+		WithStateGen(stategen.New(beaconDB)),
+		WithForkChoiceStore(doublylinkedtree.New()),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
@@ -1035,11 +1224,10 @@ func TestService_removeInvalidBlockAndState(t *testing.T) {
 func TestService_getPayloadHash(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
-	fc := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fc)),
-		WithForkChoiceStore(fc),
+		WithStateGen(stategen.New(beaconDB)),
+		WithForkChoiceStore(doublylinkedtree.New()),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
--- a/beacon-chain/blockchain/head.go
+++ b/beacon-chain/blockchain/head.go
@@ -15,11 +15,10 @@ import (
 	"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/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"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"
@@ -52,6 +51,7 @@ 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.
@@ -91,7 +91,6 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 	s.headLock.RLock()
 	oldHeadBlock, err := s.headBlock()
 	if err != nil {
-		s.headLock.RUnlock()
 		return errors.Wrap(err, "could not get old head block")
 	}
 	oldStateRoot := oldHeadBlock.Block().StateRoot()
@@ -101,36 +100,21 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 	newStateRoot := headBlock.Block().StateRoot()

 	// A chain re-org occurred, so we fire an event notifying the rest of the services.
-	if headBlock.Block().ParentRoot() != oldHeadRoot {
+	if bytesutil.ToBytes32(headBlock.Block().ParentRoot()) != oldHeadRoot {
 		commonRoot, forkSlot, err := s.ForkChoicer().CommonAncestor(ctx, oldHeadRoot, newHeadRoot)
 		if err != nil {
 			log.WithError(err).Error("Could not find common ancestor root")
 			commonRoot = params.BeaconConfig().ZeroHash
 		}
-		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,
+			"distance":           headSlot + newHeadSlot - 2*forkSlot,
+			"depth":              math.Max(uint64(headSlot-forkSlot), uint64(newHeadSlot-forkSlot)),
 		}).Info("Chain reorg occurred")
-		reorgDistance.Observe(float64(dis))
-		reorgDepth.Observe(float64(dep))
-
 		isOptimistic, err := s.IsOptimistic(ctx)
 		if err != nil {
 			return errors.Wrap(err, "could not check if node is optimistically synced")
@@ -142,14 +126,14 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 				Depth:               math.Max(uint64(headSlot-forkSlot), uint64(newHeadSlot-forkSlot)),
 				OldHeadBlock:        oldHeadRoot[:],
 				NewHeadBlock:        newHeadRoot[:],
-				OldHeadState:        oldStateRoot[:],
-				NewHeadState:        newStateRoot[:],
+				OldHeadState:        oldStateRoot,
+				NewHeadState:        newStateRoot,
 				Epoch:               slots.ToEpoch(newHeadSlot),
 				ExecutionOptimistic: isOptimistic,
 			},
 		})

-		if err := s.saveOrphanedOperations(ctx, oldHeadRoot, newHeadRoot); err != nil {
+		if err := s.saveOrphanedAtts(ctx, oldHeadRoot, newHeadRoot); err != nil {
 			return err
 		}
 		reorgCount.Inc()
@@ -168,7 +152,7 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 	// Forward an event capturing a new chain head over a common event feed
 	// done in a goroutine to avoid blocking the critical runtime main routine.
 	go func() {
-		if err := s.notifyNewHeadEvent(ctx, newHeadSlot, headState, newStateRoot[:], newHeadRoot[:]); err != nil {
+		if err := s.notifyNewHeadEvent(ctx, newHeadSlot, headState, newStateRoot, newHeadRoot[:]); err != nil {
 			log.WithError(err).Error("Could not notify event feed of new chain head")
 		}
 	}()
@@ -212,6 +196,7 @@ 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(),
@@ -232,6 +217,7 @@ 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,
@@ -241,11 +227,8 @@ 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() primitives.Slot {
-	if s.head == nil || s.head.block == nil || s.head.block.Block() == nil {
-		return 0
-	}
-	return s.head.block.Block().Slot()
+func (s *Service) headSlot() types.Slot {
+	return s.head.slot
 }

 // This returns the head root.
@@ -285,14 +268,14 @@ func (s *Service) headGenesisValidatorsRoot() [32]byte {
 // This returns the validator referenced by the provided index in
 // the head state.
 // This is a lock free version.
-func (s *Service) headValidatorAtIndex(index primitives.ValidatorIndex) (state.ReadOnlyValidator, error) {
+func (s *Service) headValidatorAtIndex(index types.ValidatorIndex) (state.ReadOnlyValidator, error) {
 	return s.head.state.ValidatorAtIndexReadOnly(index)
 }

 // This returns the validator index referenced by the provided pubkey in
 // the head state.
 // This is a lock free version.
-func (s *Service) headValidatorIndexAtPubkey(pubKey [fieldparams.BLSPubkeyLength]byte) (primitives.ValidatorIndex, bool) {
+func (s *Service) headValidatorIndexAtPubkey(pubKey [fieldparams.BLSPubkeyLength]byte) (types.ValidatorIndex, bool) {
 	return s.head.state.ValidatorIndexByPubkey(pubKey)
 }

@@ -306,7 +289,7 @@ func (s *Service) hasHeadState() bool {
 // chain head is determined, set, and saved to disk.
 func (s *Service) notifyNewHeadEvent(
 	ctx context.Context,
-	newHeadSlot primitives.Slot,
+	newHeadSlot types.Slot,
 	newHeadState state.BeaconState,
 	newHeadStateRoot,
 	newHeadRoot []byte,
@@ -314,7 +297,7 @@ func (s *Service) notifyNewHeadEvent(
 	previousDutyDependentRoot := s.originBlockRoot[:]
 	currentDutyDependentRoot := s.originBlockRoot[:]

-	var previousDutyEpoch primitives.Epoch
+	var previousDutyEpoch types.Epoch
 	currentDutyEpoch := slots.ToEpoch(newHeadSlot)
 	if currentDutyEpoch > 0 {
 		previousDutyEpoch = currentDutyEpoch.Sub(1)
@@ -358,9 +341,9 @@ func (s *Service) notifyNewHeadEvent(
 	return nil
 }

-// This saves the Attestations and BLSToExecChanges between `orphanedRoot` and the common ancestor root that is derived using `newHeadRoot`.
+// This saves the attestations 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) saveOrphanedOperations(ctx context.Context, orphanedRoot [32]byte, newHeadRoot [32]byte) error {
+func (s *Service) saveOrphanedAtts(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.
@@ -399,17 +382,7 @@ func (s *Service) saveOrphanedOperations(ctx context.Context, orphanedRoot [32]b
 			}
 			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[:])
+		orphanedRoot = bytesutil.ToBytes32(orphanedBlk.Block().ParentRoot())
 	}
 	return nil
 }
--- a/beacon-chain/blockchain/head_sync_committee_info.go
+++ b/beacon-chain/blockchain/head_sync_committee_info.go
@@ -13,7 +13,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/transition"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
 )
@@ -24,30 +24,30 @@ var syncCommitteeHeadStateCache = cache.NewSyncCommitteeHeadState()
 // HeadSyncCommitteeFetcher is the interface that wraps the head sync committee related functions.
 // The head sync committee functions return callers sync committee indices and public keys with respect to current head state.
 type HeadSyncCommitteeFetcher interface {
-	HeadSyncCommitteeIndices(ctx context.Context, index primitives.ValidatorIndex, slot primitives.Slot) ([]primitives.CommitteeIndex, error)
-	HeadSyncCommitteePubKeys(ctx context.Context, slot primitives.Slot, committeeIndex primitives.CommitteeIndex) ([][]byte, error)
+	HeadSyncCommitteeIndices(ctx context.Context, index types.ValidatorIndex, slot types.Slot) ([]types.CommitteeIndex, error)
+	HeadSyncCommitteePubKeys(ctx context.Context, slot types.Slot, committeeIndex types.CommitteeIndex) ([][]byte, error)
 }

 // HeadDomainFetcher is the interface that wraps the head sync domain related functions.
 // The head sync committee domain functions return callers domain data with respect to slot and head state.
 type HeadDomainFetcher interface {
-	HeadSyncCommitteeDomain(ctx context.Context, slot primitives.Slot) ([]byte, error)
-	HeadSyncSelectionProofDomain(ctx context.Context, slot primitives.Slot) ([]byte, error)
-	HeadSyncContributionProofDomain(ctx context.Context, slot primitives.Slot) ([]byte, error)
+	HeadSyncCommitteeDomain(ctx context.Context, slot types.Slot) ([]byte, error)
+	HeadSyncSelectionProofDomain(ctx context.Context, slot types.Slot) ([]byte, error)
+	HeadSyncContributionProofDomain(ctx context.Context, slot types.Slot) ([]byte, error)
 }

 // HeadSyncCommitteeDomain returns the head sync committee domain using current head state advanced up to `slot`.
-func (s *Service) HeadSyncCommitteeDomain(ctx context.Context, slot primitives.Slot) ([]byte, error) {
+func (s *Service) HeadSyncCommitteeDomain(ctx context.Context, slot types.Slot) ([]byte, error) {
 	return s.domainWithHeadState(ctx, slot, params.BeaconConfig().DomainSyncCommittee)
 }

 // HeadSyncSelectionProofDomain returns the head sync committee domain using current head state advanced up to `slot`.
-func (s *Service) HeadSyncSelectionProofDomain(ctx context.Context, slot primitives.Slot) ([]byte, error) {
+func (s *Service) HeadSyncSelectionProofDomain(ctx context.Context, slot types.Slot) ([]byte, error) {
 	return s.domainWithHeadState(ctx, slot, params.BeaconConfig().DomainSyncCommitteeSelectionProof)
 }

 // HeadSyncContributionProofDomain returns the head sync committee domain using current head state advanced up to `slot`.
-func (s *Service) HeadSyncContributionProofDomain(ctx context.Context, slot primitives.Slot) ([]byte, error) {
+func (s *Service) HeadSyncContributionProofDomain(ctx context.Context, slot types.Slot) ([]byte, error) {
 	return s.domainWithHeadState(ctx, slot, params.BeaconConfig().DomainContributionAndProof)
 }

@@ -61,7 +61,7 @@ func (s *Service) HeadSyncContributionProofDomain(ctx context.Context, slot prim
 // [compute_start_slot_at_epoch(epoch) - 1, compute_start_slot_at_epoch(epoch) + SLOTS_PER_EPOCH - 1)
 // rather than for the range
 // [compute_start_slot_at_epoch(epoch), compute_start_slot_at_epoch(epoch) + SLOTS_PER_EPOCH)
-func (s *Service) HeadSyncCommitteeIndices(ctx context.Context, index primitives.ValidatorIndex, slot primitives.Slot) ([]primitives.CommitteeIndex, error) {
+func (s *Service) HeadSyncCommitteeIndices(ctx context.Context, index types.ValidatorIndex, slot types.Slot) ([]types.CommitteeIndex, error) {
 	nextSlotEpoch := slots.ToEpoch(slot + 1)
 	currentEpoch := slots.ToEpoch(slot)

@@ -79,7 +79,7 @@ func (s *Service) HeadSyncCommitteeIndices(ctx context.Context, index primitives

 // headCurrentSyncCommitteeIndices returns the input validator `index`'s position indices in the current sync committee with respect to `slot`.
 // Head state advanced up to `slot` is used for calculation.
-func (s *Service) headCurrentSyncCommitteeIndices(ctx context.Context, index primitives.ValidatorIndex, slot primitives.Slot) ([]primitives.CommitteeIndex, error) {
+func (s *Service) headCurrentSyncCommitteeIndices(ctx context.Context, index types.ValidatorIndex, slot types.Slot) ([]types.CommitteeIndex, error) {
 	headState, err := s.getSyncCommitteeHeadState(ctx, slot)
 	if err != nil {
 		return nil, err
@@ -89,7 +89,7 @@ func (s *Service) headCurrentSyncCommitteeIndices(ctx context.Context, index pri

 // headNextSyncCommitteeIndices returns the input validator `index`'s position indices in the next sync committee with respect to `slot`.
 // Head state advanced up to `slot` is used for calculation.
-func (s *Service) headNextSyncCommitteeIndices(ctx context.Context, index primitives.ValidatorIndex, slot primitives.Slot) ([]primitives.CommitteeIndex, error) {
+func (s *Service) headNextSyncCommitteeIndices(ctx context.Context, index types.ValidatorIndex, slot types.Slot) ([]types.CommitteeIndex, error) {
 	headState, err := s.getSyncCommitteeHeadState(ctx, slot)
 	if err != nil {
 		return nil, err
@@ -99,7 +99,7 @@ func (s *Service) headNextSyncCommitteeIndices(ctx context.Context, index primit

 // HeadSyncCommitteePubKeys returns the head sync committee public keys with respect to `slot` and subcommittee index `committeeIndex`.
 // Head state advanced up to `slot` is used for calculation.
-func (s *Service) HeadSyncCommitteePubKeys(ctx context.Context, slot primitives.Slot, committeeIndex primitives.CommitteeIndex) ([][]byte, error) {
+func (s *Service) HeadSyncCommitteePubKeys(ctx context.Context, slot types.Slot, committeeIndex types.CommitteeIndex) ([][]byte, error) {
 	headState, err := s.getSyncCommitteeHeadState(ctx, slot)
 	if err != nil {
 		return nil, err
@@ -125,7 +125,7 @@ func (s *Service) HeadSyncCommitteePubKeys(ctx context.Context, slot primitives.
 }

 // returns calculated domain using input `domain` and `slot`.
-func (s *Service) domainWithHeadState(ctx context.Context, slot primitives.Slot, domain [4]byte) ([]byte, error) {
+func (s *Service) domainWithHeadState(ctx context.Context, slot types.Slot, domain [4]byte) ([]byte, error) {
 	headState, err := s.getSyncCommitteeHeadState(ctx, slot)
 	if err != nil {
 		return nil, err
@@ -135,7 +135,7 @@ func (s *Service) domainWithHeadState(ctx context.Context, slot primitives.Slot,

 // returns the head state that is advanced up to `slot`. It utilizes the cache `syncCommitteeHeadState` by retrieving using `slot` as key.
 // For the cache miss, it processes head state up to slot and fill the cache with `slot` as key.
-func (s *Service) getSyncCommitteeHeadState(ctx context.Context, slot primitives.Slot) (state.BeaconState, error) {
+func (s *Service) getSyncCommitteeHeadState(ctx context.Context, slot types.Slot) (state.BeaconState, error) {
 	var headState state.BeaconState
 	var err error
 	mLock := async.NewMultilock(fmt.Sprintf("%s-%d", "syncHeadState", slot))
--- a/beacon-chain/blockchain/head_sync_committee_info_test.go
+++ b/beacon-chain/blockchain/head_sync_committee_info_test.go
@@ -6,13 +6,51 @@ import (

 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/signing"
+	dbtest "github.com/prysmaticlabs/prysm/v3/beacon-chain/db/testing"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 	"github.com/prysmaticlabs/prysm/v3/testing/util"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
 )

+func TestService_headSyncCommitteeFetcher_Errors(t *testing.T) {
+	beaconDB := dbtest.SetupDB(t)
+	c := &Service{
+		cfg: &config{
+			StateGen: stategen.New(beaconDB),
+		},
+	}
+	c.head = &head{}
+	_, err := c.headCurrentSyncCommitteeIndices(context.Background(), types.ValidatorIndex(0), types.Slot(0))
+	require.ErrorContains(t, "nil state", err)
+
+	_, err = c.headNextSyncCommitteeIndices(context.Background(), types.ValidatorIndex(0), types.Slot(0))
+	require.ErrorContains(t, "nil state", err)
+
+	_, err = c.HeadSyncCommitteePubKeys(context.Background(), types.Slot(0), types.CommitteeIndex(0))
+	require.ErrorContains(t, "nil state", err)
+}
+
+func TestService_HeadDomainFetcher_Errors(t *testing.T) {
+	beaconDB := dbtest.SetupDB(t)
+	c := &Service{
+		cfg: &config{
+			StateGen: stategen.New(beaconDB),
+		},
+	}
+	c.head = &head{}
+	_, err := c.HeadSyncCommitteeDomain(context.Background(), types.Slot(0))
+	require.ErrorContains(t, "nil state", err)
+
+	_, err = c.HeadSyncSelectionProofDomain(context.Background(), types.Slot(0))
+	require.ErrorContains(t, "nil state", err)
+
+	_, err = c.HeadSyncSelectionProofDomain(context.Background(), types.Slot(0))
+	require.ErrorContains(t, "nil state", err)
+}
+
 func TestService_HeadSyncCommitteeIndices(t *testing.T) {
 	s, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().TargetCommitteeSize)
 	c := &Service{}
@@ -20,18 +58,18 @@ func TestService_HeadSyncCommitteeIndices(t *testing.T) {

 	// Current period
 	slot := 2*uint64(params.BeaconConfig().EpochsPerSyncCommitteePeriod)*uint64(params.BeaconConfig().SlotsPerEpoch) + 1
-	a, err := c.HeadSyncCommitteeIndices(context.Background(), 0, primitives.Slot(slot))
+	a, err := c.HeadSyncCommitteeIndices(context.Background(), 0, types.Slot(slot))
 	require.NoError(t, err)

 	// Current period where slot-2 across EPOCHS_PER_SYNC_COMMITTEE_PERIOD
 	slot = 3*uint64(params.BeaconConfig().EpochsPerSyncCommitteePeriod)*uint64(params.BeaconConfig().SlotsPerEpoch) - 2
-	b, err := c.HeadSyncCommitteeIndices(context.Background(), 0, primitives.Slot(slot))
+	b, err := c.HeadSyncCommitteeIndices(context.Background(), 0, types.Slot(slot))
 	require.NoError(t, err)
 	require.DeepEqual(t, a, b)

 	// Next period where slot-1 across EPOCHS_PER_SYNC_COMMITTEE_PERIOD
 	slot = 3*uint64(params.BeaconConfig().EpochsPerSyncCommitteePeriod)*uint64(params.BeaconConfig().SlotsPerEpoch) - 1
-	b, err = c.HeadSyncCommitteeIndices(context.Background(), 0, primitives.Slot(slot))
+	b, err = c.HeadSyncCommitteeIndices(context.Background(), 0, types.Slot(slot))
 	require.NoError(t, err)
 	require.DeepNotEqual(t, a, b)
 }
@@ -43,7 +81,7 @@ func TestService_headCurrentSyncCommitteeIndices(t *testing.T) {

 	// Process slot up to `EpochsPerSyncCommitteePeriod` so it can `ProcessSyncCommitteeUpdates`.
 	slot := uint64(params.BeaconConfig().EpochsPerSyncCommitteePeriod)*uint64(params.BeaconConfig().SlotsPerEpoch) + 1
-	indices, err := c.headCurrentSyncCommitteeIndices(context.Background(), 0, primitives.Slot(slot))
+	indices, err := c.headCurrentSyncCommitteeIndices(context.Background(), 0, types.Slot(slot))
 	require.NoError(t, err)

 	// NextSyncCommittee becomes CurrentSyncCommittee so it should be empty by default.
@@ -57,7 +95,7 @@ func TestService_headNextSyncCommitteeIndices(t *testing.T) {

 	// Process slot up to `EpochsPerSyncCommitteePeriod` so it can `ProcessSyncCommitteeUpdates`.
 	slot := uint64(params.BeaconConfig().EpochsPerSyncCommitteePeriod)*uint64(params.BeaconConfig().SlotsPerEpoch) + 1
-	indices, err := c.headNextSyncCommitteeIndices(context.Background(), 0, primitives.Slot(slot))
+	indices, err := c.headNextSyncCommitteeIndices(context.Background(), 0, types.Slot(slot))
 	require.NoError(t, err)

 	// NextSyncCommittee should be be empty after `ProcessSyncCommitteeUpdates`. Validator should get indices.
@@ -71,7 +109,7 @@ func TestService_HeadSyncCommitteePubKeys(t *testing.T) {

 	// Process slot up to 2 * `EpochsPerSyncCommitteePeriod` so it can run `ProcessSyncCommitteeUpdates` twice.
 	slot := uint64(2*params.BeaconConfig().EpochsPerSyncCommitteePeriod)*uint64(params.BeaconConfig().SlotsPerEpoch) + 1
-	pubkeys, err := c.HeadSyncCommitteePubKeys(context.Background(), primitives.Slot(slot), 0)
+	pubkeys, err := c.HeadSyncCommitteePubKeys(context.Background(), types.Slot(slot), 0)
 	require.NoError(t, err)

 	// Any subcommittee should match the subcommittee size.
--- a/beacon-chain/blockchain/head_test.go
+++ b/beacon-chain/blockchain/head_test.go
@@ -10,12 +10,12 @@ 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/forkchoice/protoarray"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 	"github.com/prysmaticlabs/prysm/v3/config/features"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpbv1 "github.com/prysmaticlabs/prysm/v3/proto/eth/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
@@ -31,12 +31,12 @@ func TestSaveHead_Same(t *testing.T) {
 	service := setupBeaconChain(t, beaconDB)

 	r := [32]byte{'A'}
-	service.head = &head{root: r}
+	service.head = &head{slot: 0, root: r}
 	b, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
 	require.NoError(t, err)
 	st, _ := util.DeterministicGenesisState(t, 1)
 	require.NoError(t, service.saveHead(context.Background(), r, b, st))
-	assert.Equal(t, primitives.Slot(0), service.headSlot(), "Head did not stay the same")
+	assert.Equal(t, types.Slot(0), service.headSlot(), "Head did not stay the same")
 	assert.Equal(t, r, service.headRoot(), "Head did not stay the same")
 }

@@ -50,10 +50,11 @@ func TestSaveHead_Different(t *testing.T) {
 	require.NoError(t, err)
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, bytesutil.ToBytes32(oldBlock.Block().ParentRoot()), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	service.head = &head{
+		slot:  0,
 		root:  oldRoot,
 		block: oldBlock,
 	}
@@ -65,11 +66,11 @@ func TestSaveHead_Different(t *testing.T) {
 	wsb := util.SaveBlock(t, context.Background(), service.cfg.BeaconDB, newHeadSignedBlock)
 	newRoot, err := newHeadBlock.HashTreeRoot()
 	require.NoError(t, err)
-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot()-1, wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot()-1, bytesutil.ToBytes32(wsb.Block().ParentRoot()), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))

-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, bytesutil.ToBytes32(wsb.Block().ParentRoot()), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	headState, err := util.NewBeaconState()
@@ -79,7 +80,7 @@ func TestSaveHead_Different(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(context.Background(), headState, newRoot))
 	require.NoError(t, service.saveHead(context.Background(), newRoot, wsb, headState))

-	assert.Equal(t, primitives.Slot(1), service.HeadSlot(), "Head did not change")
+	assert.Equal(t, types.Slot(1), service.HeadSlot(), "Head did not change")

 	cachedRoot, err := service.HeadRoot(context.Background())
 	require.NoError(t, err)
@@ -89,7 +90,7 @@ func TestSaveHead_Different(t *testing.T) {
 	pb, err := headBlock.Proto()
 	require.NoError(t, err)
 	assert.DeepEqual(t, newHeadSignedBlock, pb, "Head did not change")
-	assert.DeepSSZEqual(t, headState.ToProto(), service.headState(ctx).ToProto(), "Head did not change")
+	assert.DeepSSZEqual(t, headState.CloneInnerState(), service.headState(ctx).CloneInnerState(), "Head did not change")
 }

 func TestSaveHead_Different_Reorg(t *testing.T) {
@@ -103,16 +104,17 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	require.NoError(t, err)
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, bytesutil.ToBytes32(oldBlock.Block().ParentRoot()), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	service.head = &head{
+		slot:  0,
 		root:  oldRoot,
 		block: oldBlock,
 	}

 	reorgChainParent := [32]byte{'B'}
-	state, blkRoot, err = prepareForkchoiceState(ctx, 0, reorgChainParent, oldRoot, oldBlock.Block().ParentRoot(), ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 0, reorgChainParent, oldRoot, bytesutil.ToBytes32(oldBlock.Block().ParentRoot()), ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))

@@ -124,7 +126,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	wsb := util.SaveBlock(t, context.Background(), service.cfg.BeaconDB, newHeadSignedBlock)
 	newRoot, err := newHeadBlock.HashTreeRoot()
 	require.NoError(t, err)
-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, bytesutil.ToBytes32(wsb.Block().ParentRoot()), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	headState, err := util.NewBeaconState()
@@ -134,7 +136,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(context.Background(), headState, newRoot))
 	require.NoError(t, service.saveHead(context.Background(), newRoot, wsb, headState))

-	assert.Equal(t, primitives.Slot(1), service.HeadSlot(), "Head did not change")
+	assert.Equal(t, types.Slot(1), service.HeadSlot(), "Head did not change")

 	cachedRoot, err := service.HeadRoot(context.Background())
 	require.NoError(t, err)
@@ -146,7 +148,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	pb, err := headBlock.Proto()
 	require.NoError(t, err)
 	assert.DeepEqual(t, newHeadSignedBlock, pb, "Head did not change")
-	assert.DeepSSZEqual(t, headState.ToProto(), service.headState(ctx).ToProto(), "Head did not change")
+	assert.DeepSSZEqual(t, headState.CloneInnerState(), service.headState(ctx).CloneInnerState(), "Head did not change")
 	require.LogsContain(t, hook, "Chain reorg occurred")
 	require.LogsContain(t, hook, "distance=1")
 	require.LogsContain(t, hook, "depth=1")
@@ -232,6 +234,64 @@ func Test_notifyNewHeadEvent(t *testing.T) {
 	})
 }

+func TestSaveOrphanedAtts_NoCommonAncestor_Protoarray(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+	service := setupBeaconChain(t, beaconDB)
+	// this test does not make sense in doubly linked tree since it enforces
+	// that the finalized node is a common ancestor
+	service.cfg.ForkChoiceStore = protoarray.New()
+
+	service.genesisTime = time.Now().Add(time.Duration(-10*int64(1)*int64(params.BeaconConfig().SecondsPerSlot)) * time.Second)
+
+	// Chain setup
+	// 0 -- 1 -- 2 -- 3
+	//    -4
+	st, keys := util.DeterministicGenesisState(t, 64)
+	blkG, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), 0)
+	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)
+	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)
+	assert.NoError(t, err)
+	blk2.Block.ParentRoot = r1[:]
+	r2, err := blk2.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	blk3, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), 3)
+	assert.NoError(t, err)
+	blk3.Block.ParentRoot = r2[:]
+	r3, err := blk3.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	blk4 := util.NewBeaconBlock()
+	blk4.Block.Slot = 4
+	r4, err := blk4.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk3, blk4} {
+		r, err := blk.Block.HashTreeRoot()
+		require.NoError(t, err)
+		ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+		ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
+		require.NoError(t, err)
+		require.NoError(t, service.ForkChoicer().InsertNode(ctx, state, blkRoot))
+		util.SaveBlock(t, ctx, beaconDB, blk)
+	}
+
+	require.NoError(t, service.saveOrphanedAtts(ctx, r3, r4))
+	require.Equal(t, 0, service.cfg.AttPool.AggregatedAttestationCount())
+}
+
 func TestSaveOrphanedAtts(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
@@ -284,7 +344,7 @@ func TestSaveOrphanedAtts(t *testing.T) {
 		util.SaveBlock(t, ctx, beaconDB, blk)
 	}

-	require.NoError(t, service.saveOrphanedOperations(ctx, r3, r4))
+	require.NoError(t, service.saveOrphanedAtts(ctx, r3, r4))
 	require.Equal(t, 3, service.cfg.AttPool.AggregatedAttestationCount())
 	wantAtts := []*ethpb.Attestation{
 		blk3.Block.Body.Attestations[0],
@@ -302,37 +362,31 @@ 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.DeterministicGenesisStateCapella(t, 64)
-	blkConfig := util.DefaultBlockGenConfig()
-	blkConfig.NumBLSChanges = 5
-	blkG, err := util.GenerateFullBlockCapella(st, keys, blkConfig, 1)
+	st, keys := util.DeterministicGenesisState(t, 64)
+	blkG, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), 0)
 	assert.NoError(t, err)
 	util.SaveBlock(t, ctx, service.cfg.BeaconDB, blkG)
 	rG, err := blkG.Block.HashTreeRoot()
 	require.NoError(t, err)

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

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

-	blk4 := util.NewBeaconBlockCapella()
-	blkConfig.NumBLSChanges = 0
+	blk4 := util.NewBeaconBlock()
 	blk4.Block.Slot = 4
 	blk4.Block.ParentRoot = rG[:]
 	r4, err := blk4.Block.HashTreeRoot()
@@ -340,7 +394,7 @@ func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}

-	for _, blk := range []*ethpb.SignedBeaconBlockCapella{blkG, blk1, blk2, blk4} {
+	for _, blk := range []*ethpb.SignedBeaconBlock{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)
@@ -349,11 +403,8 @@ func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
 		util.SaveBlock(t, ctx, beaconDB, blk)
 	}

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

 func TestSaveOrphanedAtts_DoublyLinkedTrie(t *testing.T) {
@@ -412,7 +463,7 @@ func TestSaveOrphanedAtts_DoublyLinkedTrie(t *testing.T) {
 		util.SaveBlock(t, ctx, beaconDB, blk)
 	}

-	require.NoError(t, service.saveOrphanedOperations(ctx, r3, r4))
+	require.NoError(t, service.saveOrphanedAtts(ctx, r3, r4))
 	require.Equal(t, 3, service.cfg.AttPool.AggregatedAttestationCount())
 	wantAtts := []*ethpb.Attestation{
 		blk3.Block.Body.Attestations[0],
@@ -476,7 +527,7 @@ func TestSaveOrphanedAtts_CanFilter_DoublyLinkedTrie(t *testing.T) {
 		util.SaveBlock(t, ctx, beaconDB, blk)
 	}

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

@@ -487,7 +538,7 @@ func TestUpdateHead_noSavedChanges(t *testing.T) {
 	fcs := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 	}

--- 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 {
+	if b.Version() == version.Altair || b.Version() == version.Bellatrix {
 		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
@@ -73,7 +73,6 @@ func logBlockSyncStatus(block interfaces.BeaconBlock, blockRoot [32]byte, justif
 	}
 	level := log.Logger.GetLevel()
 	if level >= logrus.DebugLevel {
-		parentRoot := block.ParentRoot()
 		log.WithFields(logrus.Fields{
 			"slot":                      block.Slot(),
 			"slotInEpoch":               block.Slot() % params.BeaconConfig().SlotsPerEpoch,
@@ -83,11 +82,10 @@ func logBlockSyncStatus(block interfaces.BeaconBlock, blockRoot [32]byte, justif
 			"justifiedRoot":             fmt.Sprintf("0x%s...", hex.EncodeToString(justified.Root)[:8]),
 			"finalizedEpoch":            finalized.Epoch,
 			"finalizedRoot":             fmt.Sprintf("0x%s...", hex.EncodeToString(finalized.Root)[:8]),
-			"parentRoot":                fmt.Sprintf("0x%s...", hex.EncodeToString(parentRoot[:])[:8]),
+			"parentRoot":                fmt.Sprintf("0x%s...", hex.EncodeToString(block.ParentRoot())[:8]),
 			"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{
@@ -118,24 +116,12 @@ func logPayload(block interfaces.BeaconBlock) error {
 		return errors.New("gas limit should not be 0")
 	}
 	gasUtilized := float64(payload.GasUsed()) / float64(payload.GasLimit())
-	fields := logrus.Fields{
+
+	log.WithFields(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),
-	}
-	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")
+	}).Debug("Synced new payload")
 	return nil
 }
--- a/beacon-chain/blockchain/metrics.go
+++ b/beacon-chain/blockchain/metrics.go
@@ -11,7 +11,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/runtime/version"
@@ -199,24 +199,10 @@ var (
 			Buckets: []float64{1, 5, 20, 100, 500, 1000},
 		},
 	)
-	reorgDistance = promauto.NewHistogram(
-		prometheus.HistogramOpts{
-			Name:    "reorg_distance",
-			Help:    "Captures distance of reorgs. Distance is defined as the number of blocks between the old head and the new head",
-			Buckets: []float64{1, 2, 4, 8, 16, 32, 64},
-		},
-	)
-	reorgDepth = promauto.NewHistogram(
-		prometheus.HistogramOpts{
-			Name:    "reorg_depth",
-			Help:    "Captures depth of reorgs. Depth is defined as the number of blocks between the head and the common ancestor",
-			Buckets: []float64{1, 2, 4, 8, 16, 32},
-		},
-	)
 )

 // reportSlotMetrics reports slot related metrics.
-func reportSlotMetrics(stateSlot, headSlot, clockSlot primitives.Slot, finalizedCheckpoint *ethpb.Checkpoint) {
+func reportSlotMetrics(stateSlot, headSlot, clockSlot types.Slot, finalizedCheckpoint *ethpb.Checkpoint) {
 	clockTimeSlot.Set(float64(clockSlot))
 	beaconSlot.Set(float64(stateSlot))
 	beaconHeadSlot.Set(float64(headSlot))
@@ -228,7 +214,7 @@ func reportSlotMetrics(stateSlot, headSlot, clockSlot primitives.Slot, finalized

 // reportEpochMetrics reports epoch related metrics.
 func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconState) error {
-	currentEpoch := primitives.Epoch(postState.Slot() / params.BeaconConfig().SlotsPerEpoch)
+	currentEpoch := types.Epoch(postState.Slot() / params.BeaconConfig().SlotsPerEpoch)

 	// Validator instances
 	pendingInstances := 0
@@ -247,7 +233,7 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 	slashingEffectiveBalance := uint64(0)

 	for i, validator := range postState.Validators() {
-		bal, err := postState.BalanceAtIndex(primitives.ValidatorIndex(i))
+		bal, err := postState.BalanceAtIndex(types.ValidatorIndex(i))
 		if err != nil {
 			log.WithError(err).Error("Could not load validator balance")
 			continue
@@ -317,8 +303,9 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 	var b *precompute.Balance
 	var v []*precompute.Validator
 	var err error
-
-	if headState.Version() == version.Phase0 {
+	switch headState.Version() {
+	case version.Phase0:
+		// Validator participation should be viewed on the canonical chain.
 		v, b, err = precompute.New(ctx, headState)
 		if err != nil {
 			return err
@@ -327,7 +314,7 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 		if err != nil {
 			return err
 		}
-	} else if headState.Version() >= version.Altair {
+	case version.Altair, version.Bellatrix:
 		v, b, err = altair.InitializePrecomputeValidators(ctx, headState)
 		if err != nil {
 			return err
@@ -336,10 +323,9 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 		if err != nil {
 			return err
 		}
-	} else {
-		return errors.Errorf("invalid state type provided: %T", headState.ToProtoUnsafe())
+	default:
+		return errors.Errorf("invalid state type provided: %T", headState.InnerStateUnsafe())
 	}
-
 	prevEpochActiveBalances.Set(float64(b.ActivePrevEpoch))
 	prevEpochSourceBalances.Set(float64(b.PrevEpochAttested))
 	prevEpochTargetBalances.Set(float64(b.PrevEpochTargetAttested))
--- a/beacon-chain/blockchain/mock_test.go
+++ b/beacon-chain/blockchain/mock_test.go
@@ -6,17 +6,17 @@ import (
 	"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/forkchoice/protoarray"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 )

 func testServiceOptsWithDB(t *testing.T) []Option {
 	beaconDB := testDB.SetupDB(t)
-	fcs := doublylinkedtree.New()
+	fcs := protoarray.New()
 	return []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 	}
 }
--- a/beacon-chain/blockchain/options.go
+++ b/beacon-chain/blockchain/options.go
@@ -9,7 +9,6 @@ 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"
@@ -100,14 +99,6 @@ 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
@@ -13,9 +13,8 @@ import (
 	"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/consensus-types/primitives"
+	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"
 )
@@ -23,21 +22,20 @@ 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
 //
-//	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)
+//    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
@@ -49,13 +47,9 @@ func (s *Service) validateMergeBlock(ctx context.Context, b interfaces.SignedBea
 	if payload.IsNil() {
 		return errors.New("nil execution payload")
 	}
-	ok, err := canUseValidatedTerminalBlockHash(b.Block().Slot(), payload)
-	if err != nil {
+	if err := validateTerminalBlockHash(b.Block().Slot(), payload); err != nil {
 		return errors.Wrap(err, "could not validate terminal block hash")
 	}
-	if ok {
-		return nil
-	}
 	mergeBlockParentHash, mergeBlockTD, err := s.getBlkParentHashAndTD(ctx, payload.ParentHash())
 	if err != nil {
 		return errors.Wrap(err, "could not get merge block parent hash and total difficulty")
@@ -97,7 +91,6 @@ 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")
@@ -109,34 +102,32 @@ func (s *Service) getBlkParentHashAndTD(ctx context.Context, blkHash []byte) ([]
 	return blk.ParentHash[:], blkTDUint256, nil
 }

-// canUseValidatedTerminalBlockHash validates if the merge block is a valid terminal PoW block.
+// 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
-func canUseValidatedTerminalBlockHash(blkSlot primitives.Slot, payload interfaces.ExecutionData) (bool, error) {
+//        # 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 false, nil
+		return nil
 	}
 	if params.BeaconConfig().TerminalBlockHashActivationEpoch > slots.ToEpoch(blkSlot) {
-		return false, errors.New("terminal block hash activation epoch not reached")
+		return errors.New("terminal block hash activation epoch not reached")
 	}
 	if !bytes.Equal(payload.ParentHash(), params.BeaconConfig().TerminalBlockHash.Bytes()) {
-		return false, errors.New("parent hash does not match terminal block hash")
+		return errors.New("parent hash does not match terminal block hash")
 	}
-	return true, nil
+	return nil
 }

 // 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/pow_block_test.go
+++ b/beacon-chain/blockchain/pow_block_test.go
@@ -10,7 +10,7 @@ import (
 	"github.com/holiman/uint256"
 	testDB "github.com/prysmaticlabs/prysm/v3/beacon-chain/db/testing"
 	mocks "github.com/prysmaticlabs/prysm/v3/beacon-chain/execution/testing"
-	doublylinkedtree "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/doubly-linked-tree"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/protoarray"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
@@ -18,7 +18,6 @@ import (
 	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 Test_validTerminalPowBlock(t *testing.T) {
@@ -110,10 +109,10 @@ func Test_validateMergeBlock(t *testing.T) {

 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
-	fcs := doublylinkedtree.New()
+	fcs := protoarray.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 	}
 	service, err := NewService(ctx, opts...)
@@ -160,10 +159,10 @@ func Test_validateMergeBlock(t *testing.T) {
 func Test_getBlkParentHashAndTD(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
-	fcs := doublylinkedtree.New()
+	fcs := protoarray.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 	}
 	service, err := NewService(ctx, opts...)
@@ -214,42 +213,20 @@ func Test_getBlkParentHashAndTD(t *testing.T) {
 func Test_validateTerminalBlockHash(t *testing.T) {
 	wrapped, err := blocks.WrappedExecutionPayload(&enginev1.ExecutionPayload{})
 	require.NoError(t, err)
-	ok, err := canUseValidatedTerminalBlockHash(1, wrapped)
-	require.NoError(t, err)
-	require.Equal(t, false, ok)
+	require.NoError(t, validateTerminalBlockHash(1, wrapped))

 	cfg := params.BeaconConfig()
 	cfg.TerminalBlockHash = [32]byte{0x01}
 	params.OverrideBeaconConfig(cfg)
-	ok, err = canUseValidatedTerminalBlockHash(1, wrapped)
-	require.ErrorContains(t, "terminal block hash activation epoch not reached", err)
-	require.Equal(t, false, ok)
+	require.ErrorContains(t, "terminal block hash activation epoch not reached", validateTerminalBlockHash(1, wrapped))

 	cfg.TerminalBlockHashActivationEpoch = 0
 	params.OverrideBeaconConfig(cfg)
-	ok, err = canUseValidatedTerminalBlockHash(1, wrapped)
-	require.ErrorContains(t, "parent hash does not match terminal block hash", err)
-	require.Equal(t, false, ok)
+	require.ErrorContains(t, "parent hash does not match terminal block hash", validateTerminalBlockHash(1, wrapped))

 	wrapped, err = blocks.WrappedExecutionPayload(&enginev1.ExecutionPayload{
 		ParentHash: cfg.TerminalBlockHash.Bytes(),
 	})
 	require.NoError(t, err)
-	ok, err = canUseValidatedTerminalBlockHash(1, wrapped)
-	require.NoError(t, err)
-	require.Equal(t, true, ok)
-
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-	opts := []Option{
-		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, doublylinkedtree.New())),
-	}
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-	blk, err := blocks.NewSignedBeaconBlock(util.HydrateSignedBeaconBlockBellatrix(&ethpb.SignedBeaconBlockBellatrix{}))
-	require.NoError(t, err)
-	blk.Block().SetSlot(1)
-	require.NoError(t, blk.Block().Body().SetExecution(wrapped))
-	require.NoError(t, service.validateMergeBlock(ctx, blk))
+	require.NoError(t, validateTerminalBlockHash(1, wrapped))
 }
--- a/beacon-chain/blockchain/process_attestation.go
+++ b/beacon-chain/blockchain/process_attestation.go
@@ -19,24 +19,23 @@ 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.
 //
-//	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)
 //
-//	 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)
+//    # 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)
 //
-//	 # 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)
+//    # 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_attestation_helpers.go
+++ b/beacon-chain/blockchain/process_attestation_helpers.go
@@ -11,7 +11,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
@@ -60,9 +60,9 @@ func (s *Service) getAttPreState(ctx context.Context, c *ethpb.Checkpoint) (stat

 // verifyAttTargetEpoch validates attestation is from the current or previous epoch.
 func verifyAttTargetEpoch(_ context.Context, genesisTime, nowTime uint64, c *ethpb.Checkpoint) error {
-	currentSlot := primitives.Slot((nowTime - genesisTime) / params.BeaconConfig().SecondsPerSlot)
+	currentSlot := types.Slot((nowTime - genesisTime) / params.BeaconConfig().SecondsPerSlot)
 	currentEpoch := slots.ToEpoch(currentSlot)
-	var prevEpoch primitives.Epoch
+	var prevEpoch types.Epoch
 	// Prevents previous epoch under flow
 	if currentEpoch > 1 {
 		prevEpoch = currentEpoch - 1
--- a/beacon-chain/blockchain/process_attestation_test.go
+++ b/beacon-chain/blockchain/process_attestation_test.go
@@ -8,11 +8,12 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/core/transition"
 	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/forkchoice/protoarray"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/assert"
@@ -21,15 +22,14 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
 )

-func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
+func TestStore_OnAttestation_ErrorConditions_ProtoArray(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)

-	fc := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithForkChoiceStore(fc),
-		WithStateGen(stategen.New(beaconDB, fc)),
+		WithForkChoiceStore(doublylinkedtree.New()),
+		WithStateGen(stategen.New(beaconDB)),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
@@ -128,6 +128,142 @@ func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
 	}
 }

+func TestStore_OnAttestation_ErrorConditions_DoublyLinkedTree(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+
+	opts := []Option{
+		WithDatabase(beaconDB),
+		WithForkChoiceStore(doublylinkedtree.New()),
+		WithStateGen(stategen.New(beaconDB)),
+	}
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+
+	_, err = blockTree1(t, beaconDB, []byte{'g'})
+	require.NoError(t, err)
+
+	blkWithoutState := util.NewBeaconBlock()
+	blkWithoutState.Block.Slot = 0
+	util.SaveBlock(t, ctx, beaconDB, blkWithoutState)
+	BlkWithOutStateRoot, err := blkWithoutState.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	blkWithStateBadAtt := util.NewBeaconBlock()
+	blkWithStateBadAtt.Block.Slot = 1
+	util.SaveBlock(t, ctx, beaconDB, blkWithStateBadAtt)
+	BlkWithStateBadAttRoot, err := blkWithStateBadAtt.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	s, err := util.NewBeaconState()
+	require.NoError(t, err)
+	require.NoError(t, s.SetSlot(100*params.BeaconConfig().SlotsPerEpoch))
+	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, BlkWithStateBadAttRoot))
+
+	blkWithValidState := util.NewBeaconBlock()
+	blkWithValidState.Block.Slot = 2
+	util.SaveBlock(t, ctx, beaconDB, blkWithValidState)
+
+	blkWithValidStateRoot, err := blkWithValidState.Block.HashTreeRoot()
+	require.NoError(t, err)
+	s, err = util.NewBeaconState()
+	require.NoError(t, err)
+	err = s.SetFork(&ethpb.Fork{
+		Epoch:           0,
+		CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
+		PreviousVersion: params.BeaconConfig().GenesisForkVersion,
+	})
+	require.NoError(t, err)
+	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, blkWithValidStateRoot))
+
+	tests := []struct {
+		name      string
+		a         *ethpb.Attestation
+		wantedErr string
+	}{
+		{
+			name:      "attestation's data slot not aligned with target vote",
+			a:         util.HydrateAttestation(&ethpb.Attestation{Data: &ethpb.AttestationData{Slot: params.BeaconConfig().SlotsPerEpoch, Target: &ethpb.Checkpoint{Root: make([]byte, 32)}}}),
+			wantedErr: "slot 32 does not match target epoch 0",
+		},
+		{
+			name:      "no pre state for attestations's target block",
+			a:         util.HydrateAttestation(&ethpb.Attestation{Data: &ethpb.AttestationData{Target: &ethpb.Checkpoint{Root: BlkWithOutStateRoot[:]}}}),
+			wantedErr: "could not get pre state for epoch 0",
+		},
+		{
+			name: "process attestation doesn't match current epoch",
+			a: util.HydrateAttestation(&ethpb.Attestation{Data: &ethpb.AttestationData{Slot: 100 * params.BeaconConfig().SlotsPerEpoch, Target: &ethpb.Checkpoint{Epoch: 100,
+				Root: BlkWithStateBadAttRoot[:]}}}),
+			wantedErr: "target epoch 100 does not match current epoch",
+		},
+		{
+			name:      "process nil attestation",
+			a:         nil,
+			wantedErr: "attestation can't be nil",
+		},
+		{
+			name:      "process nil field (a.Data) in attestation",
+			a:         &ethpb.Attestation{},
+			wantedErr: "attestation's data can't be nil",
+		},
+		{
+			name: "process nil field (a.Target) in attestation",
+			a: &ethpb.Attestation{
+				Data: &ethpb.AttestationData{
+					BeaconBlockRoot: make([]byte, fieldparams.RootLength),
+					Target:          nil,
+					Source:          &ethpb.Checkpoint{Root: make([]byte, fieldparams.RootLength)},
+				},
+				AggregationBits: make([]byte, 1),
+				Signature:       make([]byte, 96),
+			},
+			wantedErr: "attestation's target can't be nil",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			err := service.OnAttestation(ctx, tt.a)
+			if tt.wantedErr != "" {
+				assert.ErrorContains(t, tt.wantedErr, err)
+			} else {
+				assert.NoError(t, err)
+			}
+		})
+	}
+}
+
+func TestStore_OnAttestation_Ok_ProtoArray(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+
+	fcs := protoarray.New()
+	opts := []Option{
+		WithDatabase(beaconDB),
+		WithStateGen(stategen.New(beaconDB)),
+		WithForkChoiceStore(fcs),
+	}
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+	genesisState, pks := util.DeterministicGenesisState(t, 64)
+	service.SetGenesisTime(time.Unix(time.Now().Unix()-int64(params.BeaconConfig().SecondsPerSlot), 0))
+	require.NoError(t, service.saveGenesisData(ctx, genesisState))
+	att, err := util.GenerateAttestations(genesisState, pks, 1, 0, false)
+	require.NoError(t, err)
+	tRoot := bytesutil.ToBytes32(att[0].Data.Target.Root)
+	copied := genesisState.Copy()
+	copied, err = transition.ProcessSlots(ctx, copied, 1)
+	require.NoError(t, err)
+	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, copied, tRoot))
+	ojc := &ethpb.Checkpoint{Epoch: 1, Root: tRoot[:]}
+	ofc := &ethpb.Checkpoint{Epoch: 1, Root: tRoot[:]}
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
+	require.NoError(t, err)
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
+	require.NoError(t, service.OnAttestation(ctx, att[0]))
+}
+
 func TestStore_OnAttestation_Ok_DoublyLinkedTree(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
@@ -135,7 +271,7 @@ func TestStore_OnAttestation_Ok_DoublyLinkedTree(t *testing.T) {
 	fcs := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 	}
 	service, err := NewService(ctx, opts...)
@@ -164,7 +300,7 @@ func TestStore_SaveCheckpointState(t *testing.T) {

 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, doublylinkedtree.New())),
+		WithStateGen(stategen.New(beaconDB)),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
@@ -226,12 +362,12 @@ func TestStore_UpdateCheckpointState(t *testing.T) {

 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, doublylinkedtree.New())),
+		WithStateGen(stategen.New(beaconDB)),
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)

-	epoch := primitives.Epoch(1)
+	epoch := types.Epoch(1)
 	baseState, _ := util.DeterministicGenesisState(t, 1)
 	checkpoint := &ethpb.Checkpoint{Epoch: epoch, Root: bytesutil.PadTo([]byte("hi"), fieldparams.RootLength)}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(checkpoint.Root)))
@@ -256,7 +392,7 @@ func TestStore_UpdateCheckpointState(t *testing.T) {

 	cached, err = service.checkpointStateCache.StateByCheckpoint(newCheckpoint)
 	require.NoError(t, err)
-	require.DeepSSZEqual(t, returned.ToProtoUnsafe(), cached.ToProtoUnsafe())
+	require.DeepSSZEqual(t, returned.InnerStateUnsafe(), cached.InnerStateUnsafe())
 }

 func TestAttEpoch_MatchPrevEpoch(t *testing.T) {
@@ -325,6 +461,37 @@ func TestVerifyBeaconBlock_OK(t *testing.T) {
 	assert.NoError(t, service.verifyBeaconBlock(ctx, d), "Did not receive the wanted error")
 }

+func TestVerifyFinalizedConsistency_InconsistentRoot_ProtoArray(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+
+	fcs := protoarray.New()
+	opts := []Option{
+		WithDatabase(beaconDB),
+		WithStateGen(stategen.New(beaconDB)),
+		WithForkChoiceStore(fcs),
+	}
+	service, err := NewService(ctx, opts...)
+	require.NoError(t, err)
+
+	b32 := util.NewBeaconBlock()
+	b32.Block.Slot = 32
+	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b32)
+	r32, err := b32.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	require.NoError(t, service.ForkChoicer().UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Epoch: 1}))
+	b33 := util.NewBeaconBlock()
+	b33.Block.Slot = 33
+	b33.Block.ParentRoot = r32[:]
+	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b33)
+	r33, err := b33.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	err = service.VerifyFinalizedConsistency(context.Background(), r33[:])
+	require.ErrorContains(t, "Root and finalized store are not consistent", err)
+}
+
 func TestVerifyFinalizedConsistency_InconsistentRoot_DoublyLinkedTree(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
@@ -332,7 +499,7 @@ func TestVerifyFinalizedConsistency_InconsistentRoot_DoublyLinkedTree(t *testing
 	fcs := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB, fcs)),
+		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
 	}
 	service, err := NewService(ctx, opts...)
--- a/beacon-chain/blockchain/process_block.go
+++ b/beacon-chain/blockchain/process_block.go
@@ -19,16 +19,16 @@ 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"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/crypto/bls"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v3/monitoring/tracing"
+	enginev1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	ethpbv1 "github.com/prysmaticlabs/prysm/v3/proto/eth/v1"
 	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"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
-	"github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
 )

@@ -46,53 +46,52 @@ 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
 //
-//	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
 //
-//	 # 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
+//    # 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 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 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
 //
-//	 # 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
+//    # Update finalized checkpoint
+//    if state.finalized_checkpoint.epoch > store.finalized_checkpoint.epoch:
+//        store.finalized_checkpoint = state.finalized_checkpoint
 //
-//	 # Update finalized checkpoint
-//	 if state.finalized_checkpoint.epoch > store.finalized_checkpoint.epoch:
-//	     store.finalized_checkpoint = state.finalized_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
 //
-//	     # 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
+//            # 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()
@@ -147,10 +146,6 @@ 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 {
@@ -197,22 +192,6 @@ func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlo
 	if err != nil {
 		log.WithError(err).Warn("Could not update head")
 	}
-	if blockRoot != headRoot {
-		receivedWeight, err := s.ForkChoicer().Weight(blockRoot)
-		if err != nil {
-			log.WithField("root", fmt.Sprintf("%#x", blockRoot)).Warn("could not determine node weight")
-		}
-		headWeight, err := s.ForkChoicer().Weight(headRoot)
-		if err != nil {
-			log.WithField("root", fmt.Sprintf("%#x", headRoot)).Warn("could not determine node weight")
-		}
-		log.WithFields(logrus.Fields{
-			"receivedRoot":   fmt.Sprintf("%#x", blockRoot),
-			"receivedWeight": receivedWeight,
-			"headRoot":       fmt.Sprintf("%#x", headRoot),
-			"headWeight":     headWeight,
-		}).Debug("Head block is not the received block")
-	}
 	newBlockHeadElapsedTime.Observe(float64(time.Since(start).Milliseconds()))

 	if err := s.notifyEngineIfChangedHead(ctx, headRoot); err != nil {
@@ -269,13 +248,12 @@ func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlo
 		}
 		go func() {
 			// Send an event regarding the new finalized checkpoint over a common event feed.
-			stateRoot := signed.Block().StateRoot()
 			s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
 				Type: statefeed.FinalizedCheckpoint,
 				Data: &ethpbv1.EventFinalizedCheckpoint{
 					Epoch:               postState.FinalizedCheckpoint().Epoch,
 					Block:               postState.FinalizedCheckpoint().Root,
-					State:               stateRoot[:],
+					State:               signed.Block().StateRoot(),
 					ExecutionOptimistic: isOptimistic,
 				},
 			})
@@ -299,11 +277,11 @@ func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlo
 	return nil
 }

-func getStateVersionAndPayload(st state.BeaconState) (int, interfaces.ExecutionData, error) {
+func getStateVersionAndPayload(st state.BeaconState) (int, *enginev1.ExecutionPayloadHeader, error) {
 	if st == nil {
 		return 0, nil, errors.New("nil state")
 	}
-	var preStateHeader interfaces.ExecutionData
+	var preStateHeader *enginev1.ExecutionPayloadHeader
 	var err error
 	preStateVersion := st.Version()
 	switch preStateVersion {
@@ -339,7 +317,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeac
 	if err := s.verifyBlkPreState(ctx, b); err != nil {
 		return err
 	}
-	preState, err := s.cfg.StateGen.StateByRootInitialSync(ctx, b.ParentRoot())
+	preState, err := s.cfg.StateGen.StateByRootInitialSync(ctx, bytesutil.ToBytes32(b.ParentRoot()))
 	if err != nil {
 		return err
 	}
@@ -354,10 +332,14 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeac

 	jCheckpoints := make([]*ethpb.Checkpoint, len(blks))
 	fCheckpoints := make([]*ethpb.Checkpoint, len(blks))
-	sigSet := bls.NewSet()
+	sigSet := &bls.SignatureBatch{
+		Signatures: [][]byte{},
+		PublicKeys: []bls.PublicKey{},
+		Messages:   [][32]byte{},
+	}
 	type versionAndHeader struct {
 		version int
-		header  interfaces.ExecutionData
+		header  *enginev1.ExecutionPayloadHeader
 	}
 	preVersionAndHeaders := make([]*versionAndHeader, len(blks))
 	postVersionAndHeaders := make([]*versionAndHeader, len(blks))
@@ -394,13 +376,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeac
 		}
 		sigSet.Join(set)
 	}
-
-	var verify bool
-	if features.Get().EnableVerboseSigVerification {
-		verify, err = sigSet.VerifyVerbosely()
-	} else {
-		verify, err = sigSet.Verify()
-	}
+	verify, err := sigSet.Verify()
 	if err != nil {
 		return invalidBlock{error: err}
 	}
@@ -540,7 +516,7 @@ func (s *Service) insertBlockToForkchoiceStore(ctx context.Context, blk interfac
 	ctx, span := trace.StartSpan(ctx, "blockChain.insertBlockToForkchoiceStore")
 	defer span.End()

-	if !s.cfg.ForkChoiceStore.HasNode(blk.ParentRoot()) {
+	if !s.cfg.ForkChoiceStore.HasNode(bytesutil.ToBytes32(blk.ParentRoot())) {
 		fCheckpoint := st.FinalizedCheckpoint()
 		jCheckpoint := st.CurrentJustifiedCheckpoint()
 		if err := s.fillInForkChoiceMissingBlocks(ctx, blk, fCheckpoint, jCheckpoint); err != nil {
@@ -548,7 +524,11 @@ func (s *Service) insertBlockToForkchoiceStore(ctx context.Context, blk interfac
 		}
 	}

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

 // This feeds in the attestations included in the block to fork choice store. It's allows fork choice store
@@ -580,7 +560,7 @@ func (s *Service) InsertSlashingsToForkChoiceStore(ctx context.Context, slashing
 	for _, slashing := range slashings {
 		indices := blocks.SlashableAttesterIndices(slashing)
 		for _, index := range indices {
-			s.ForkChoicer().InsertSlashedIndex(ctx, primitives.ValidatorIndex(index))
+			s.ForkChoicer().InsertSlashedIndex(ctx, types.ValidatorIndex(index))
 		}
 	}
 }
@@ -626,7 +606,7 @@ func (s *Service) pruneCanonicalAttsFromPool(ctx context.Context, r [32]byte, b
 }

 // validateMergeTransitionBlock validates the merge transition block.
-func (s *Service) validateMergeTransitionBlock(ctx context.Context, stateVersion int, stateHeader interfaces.ExecutionData, blk interfaces.SignedBeaconBlock) error {
+func (s *Service) validateMergeTransitionBlock(ctx context.Context, stateVersion int, stateHeader *enginev1.ExecutionPayloadHeader, blk interfaces.SignedBeaconBlock) error {
 	// Skip validation if block is older than Bellatrix.
 	if blocks.IsPreBellatrixVersion(blk.Block().Version()) {
 		return nil
@@ -653,7 +633,11 @@ func (s *Service) validateMergeTransitionBlock(ctx context.Context, stateVersion

 	// Skip validation if the block is not a merge transition block.
 	// To reach here. The payload must be non-empty. If the state header is empty then it's at transition.
-	empty, err := consensusblocks.IsEmptyExecutionData(stateHeader)
+	wh, err := consensusblocks.WrappedExecutionPayloadHeader(stateHeader)
+	if err != nil {
+		return err
+	}
+	empty, err := consensusblocks.IsEmptyExecutionData(wh)
 	if err != nil {
 		return err
 	}
@@ -684,8 +668,25 @@ func (s *Service) fillMissingPayloadIDRoutine(ctx context.Context, stateFeed *ev
 		for {
 			select {
 			case ti := <-ticker.C:
-				if err := s.fillMissingBlockPayloadId(ctx, ti); err != nil {
-					log.WithError(err).Error("Could not fill missing payload ID")
+				if !atHalfSlot(ti) {
+					continue
+				}
+				_, id, has := s.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(s.CurrentSlot()+1, s.headRoot())
+				// 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()
 				}
 			case <-s.ctx.Done():
 				log.Debug("Context closed, exiting routine")
@@ -700,31 +701,3 @@ 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
@@ -6,12 +6,14 @@ 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"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/protoarray"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	mathutil "github.com/prysmaticlabs/prysm/v3/math"
 	"github.com/prysmaticlabs/prysm/v3/monitoring/tracing"
@@ -21,7 +23,7 @@ import (
 )

 // CurrentSlot returns the current slot based on time.
-func (s *Service) CurrentSlot() primitives.Slot {
+func (s *Service) CurrentSlot() types.Slot {
 	return slots.CurrentSlot(uint64(s.genesisTime.Unix()))
 }

@@ -37,7 +39,7 @@ func (s *Service) getBlockPreState(ctx context.Context, b interfaces.BeaconBlock
 		return nil, err
 	}

-	preState, err := s.cfg.StateGen.StateByRoot(ctx, b.ParentRoot())
+	preState, err := s.cfg.StateGen.StateByRoot(ctx, bytesutil.ToBytes32(b.ParentRoot()))
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get pre state for slot %d", b.Slot())
 	}
@@ -63,7 +65,7 @@ func (s *Service) verifyBlkPreState(ctx context.Context, b interfaces.BeaconBloc
 	ctx, span := trace.StartSpan(ctx, "blockChain.verifyBlkPreState")
 	defer span.End()

-	parentRoot := b.ParentRoot()
+	parentRoot := bytesutil.ToBytes32(b.ParentRoot())
 	// Loosen the check to HasBlock because state summary gets saved in batches
 	// during initial syncing. There's no risk given a state summary object is just a
 	// a subset of the block object.
@@ -71,7 +73,7 @@ func (s *Service) verifyBlkPreState(ctx context.Context, b interfaces.BeaconBloc
 		return errors.New("could not reconstruct parent state")
 	}

-	if err := s.VerifyFinalizedBlkDescendant(ctx, parentRoot); err != nil {
+	if err := s.VerifyFinalizedBlkDescendant(ctx, bytesutil.ToBytes32(b.ParentRoot())); err != nil {
 		return err
 	}

@@ -161,7 +163,7 @@ func (s *Service) updateFinalized(ctx context.Context, cp *ethpb.Checkpoint) err

 	fRoot := bytesutil.ToBytes32(cp.Root)
 	optimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(fRoot)
-	if err != nil && !errors.Is(err, doublylinkedtree.ErrNilNode) {
+	if err != nil && err != protoarray.ErrUnknownNodeRoot && err != doublylinkedtree.ErrNilNode {
 		return err
 	}
 	if !optimistic {
@@ -170,31 +172,25 @@ func (s *Service) updateFinalized(ctx context.Context, cp *ethpb.Checkpoint) err
 			return err
 		}
 	}
-	go func() {
-		// We do not pass in the parent context from the method as this method call
-		// is meant to be asynchronous and run in the background rather than being
-		// tied to the execution of a block.
-		if err := s.cfg.StateGen.MigrateToCold(s.ctx, fRoot); err != nil {
-			log.WithError(err).Error("could not migrate to cold")
-		}
-	}()
+	if err := s.cfg.StateGen.MigrateToCold(ctx, fRoot); err != nil {
+		return errors.Wrap(err, "could not migrate to cold")
+	}
 	return nil
 }

 // 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
-func (s *Service) ancestor(ctx context.Context, root []byte, slot primitives.Slot) ([]byte, error) {
+//   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()

@@ -215,7 +211,7 @@ func (s *Service) ancestor(ctx context.Context, root []byte, slot primitives.Slo
 }

 // This retrieves an ancestor root using fork choice store. The look up is looping through the a flat array structure.
-func (s *Service) ancestorByForkChoiceStore(ctx context.Context, r [32]byte, slot primitives.Slot) ([]byte, error) {
+func (s *Service) ancestorByForkChoiceStore(ctx context.Context, r [32]byte, slot types.Slot) ([]byte, error) {
 	ctx, span := trace.StartSpan(ctx, "blockChain.ancestorByForkChoiceStore")
 	defer span.End()

@@ -227,7 +223,7 @@ func (s *Service) ancestorByForkChoiceStore(ctx context.Context, r [32]byte, slo
 }

 // This retrieves an ancestor root using DB. The look up is recursively looking up DB. Slower than `ancestorByForkChoiceStore`.
-func (s *Service) ancestorByDB(ctx context.Context, r [32]byte, slot primitives.Slot) ([]byte, error) {
+func (s *Service) ancestorByDB(ctx context.Context, r [32]byte, slot types.Slot) ([]byte, error) {
 	ctx, span := trace.StartSpan(ctx, "blockChain.ancestorByDB")
 	defer span.End()

@@ -245,7 +241,7 @@ func (s *Service) ancestorByDB(ctx context.Context, r [32]byte, slot primitives.
 		return r[:], nil
 	}

-	return s.ancestorByDB(ctx, b.ParentRoot(), slot)
+	return s.ancestorByDB(ctx, bytesutil.ToBytes32(b.ParentRoot()), slot)
 }

 // This retrieves missing blocks from DB (ie. the blocks that couldn't be received over sync) and inserts them to fork choice store.
@@ -263,7 +259,7 @@ func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, blk interfa
 	pendingNodes = append(pendingNodes, &forkchoicetypes.BlockAndCheckpoints{Block: blk,
 		JustifiedCheckpoint: jCheckpoint, FinalizedCheckpoint: fCheckpoint})
 	// As long as parent node is not in fork choice store, and parent node is in DB.
-	root := blk.ParentRoot()
+	root := bytesutil.ToBytes32(blk.ParentRoot())
 	for !s.cfg.ForkChoiceStore.HasNode(root) && s.cfg.BeaconDB.HasBlock(ctx, root) {
 		b, err := s.getBlock(ctx, root)
 		if err != nil {
@@ -272,7 +268,7 @@ func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, blk interfa
 		if b.Block().Slot() <= fSlot {
 			break
 		}
-		root = b.Block().ParentRoot()
+		root = bytesutil.ToBytes32(b.Block().ParentRoot())
 		args := &forkchoicetypes.BlockAndCheckpoints{Block: b.Block(),
 			JustifiedCheckpoint: jCheckpoint,
 			FinalizedCheckpoint: fCheckpoint}
@@ -316,6 +312,23 @@ 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
--- a/beacon-chain/blockchain/receive_attestation.go
+++ b/beacon-chain/blockchain/receive_attestation.go
@@ -122,10 +122,12 @@ func (s *Service) spawnProcessAttestationsRoutine(stateFeed *event.Feed) {
 			case <-st.C():
 				if err := s.ForkChoicer().NewSlot(s.ctx, s.CurrentSlot()); err != nil {
 					log.WithError(err).Error("Could not process new slot")
+					return
 				}

 				if err := s.UpdateHead(s.ctx); err != nil {
 					log.WithError(err).Error("Could not process attestations and update head")
+					return
 				}
 			}
 		}
@@ -135,6 +137,12 @@ func (s *Service) spawnProcessAttestationsRoutine(stateFeed *event.Feed) {
 // UpdateHead updates the canonical head of the chain based on information from fork-choice attestations and votes.
 // It requires no external inputs.
 func (s *Service) UpdateHead(ctx context.Context) error {
+	// Continue when there's no fork choice attestation, there's nothing to process and update head.
+	// This covers the condition when the node is still initial syncing to the head of the chain.
+	if s.cfg.AttPool.ForkchoiceAttestationCount() == 0 {
+		return nil
+	}
+
 	// Only one process can process attestations and update head at a time.
 	s.processAttestationsLock.Lock()
 	defer s.processAttestationsLock.Unlock()
@@ -151,7 +159,7 @@ func (s *Service) UpdateHead(ctx context.Context) error {
 	start = time.Now()
 	newHeadRoot, err := s.cfg.ForkChoiceStore.Head(ctx, balances)
 	if err != nil {
-		log.WithError(err).Error("Could not compute head from new attestations")
+		log.WithError(err).Warn("Resolving fork due to new attestation")
 	}
 	newAttHeadElapsedTime.Observe(float64(time.Since(start).Milliseconds()))

--- a/beacon-chain/blockchain/receive_attestation_test.go
+++ b/beacon-chain/blockchain/receive_attestation_test.go
@@ -13,7 +13,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/attestations"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
@@ -35,7 +35,7 @@ func TestAttestationCheckPtState_FarFutureSlot(t *testing.T) {
 	chainService := setupBeaconChain(t, beaconDB)
 	chainService.genesisTime = time.Now()

-	e := primitives.Epoch(slots.MaxSlotBuffer/uint64(params.BeaconConfig().SlotsPerEpoch) + 1)
+	e := types.Epoch(slots.MaxSlotBuffer/uint64(params.BeaconConfig().SlotsPerEpoch) + 1)
 	_, err := chainService.AttestationTargetState(context.Background(), &ethpb.Checkpoint{Epoch: e})
 	require.ErrorContains(t, "exceeds max allowed value relative to the local clock", err)
 }
@@ -159,6 +159,7 @@ 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,
@@ -176,6 +177,7 @@ 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,
@@ -186,7 +188,7 @@ func TestNotifyEngineIfChangedHead(t *testing.T) {
 	require.LogsDoNotContain(t, hook, hookErr)
 	vId, payloadID, has := service.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(2, [32]byte{2})
 	require.Equal(t, true, has)
-	require.Equal(t, primitives.ValidatorIndex(1), vId)
+	require.Equal(t, types.ValidatorIndex(1), vId)
 	require.Equal(t, [8]byte{1}, payloadID)

 	// Test zero headRoot returns immediately.
@@ -224,11 +226,11 @@ func TestService_ProcessAttestationsAndUpdateHead(t *testing.T) {
 	require.Equal(t, 2, fcs.NodeCount())
 	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wsb))

-	// Generate attestations for this block in Slot 1
+	// Generate attestatios 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 forkchoice
+	// Verify the target is in forchoice
 	require.Equal(t, true, fcs.HasNode(bytesutil.ToBytes32(atts[0].Data.BeaconBlockRoot)))

 	// Insert a new block to forkchoice
@@ -251,52 +253,3 @@ func TestService_ProcessAttestationsAndUpdateHead(t *testing.T) {
 	require.Equal(t, 0, len(service.cfg.AttPool.ForkchoiceAttestations())) // Validate att pool is empty
 	require.Equal(t, tRoot, service.head.root)                             // Validate head is the new one
 }
-
-func TestService_UpdateHead_NoAtts(t *testing.T) {
-	ctx := context.Background()
-	opts := testServiceOptsWithDB(t)
-	fcs := doublylinkedtree.New()
-	opts = append(opts,
-		WithAttestationPool(attestations.NewPool()),
-		WithStateNotifier(&mockBeaconNode{}),
-		WithForkChoiceStore(fcs),
-	)
-
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-	service.genesisTime = prysmTime.Now().Add(-2 * time.Duration(params.BeaconConfig().SecondsPerSlot) * time.Second)
-	genesisState, pks := util.DeterministicGenesisState(t, 64)
-	require.NoError(t, service.saveGenesisData(ctx, genesisState))
-	copied := genesisState.Copy()
-	// Generate a new block
-	blk, err := util.GenerateFullBlock(copied, pks, util.DefaultBlockGenConfig(), 1)
-	require.NoError(t, err)
-	tRoot, err := blk.Block.HashTreeRoot()
-	require.NoError(t, err)
-	wsb, err := blocks.NewSignedBeaconBlock(blk)
-	require.NoError(t, err)
-	require.NoError(t, service.onBlock(ctx, wsb, tRoot))
-	require.Equal(t, 2, fcs.NodeCount())
-	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wsb))
-	require.Equal(t, tRoot, service.head.root)
-
-	// Insert a new block to forkchoice
-	ojc := &ethpb.Checkpoint{Epoch: 0, Root: params.BeaconConfig().ZeroHash[:]}
-	b, err := util.GenerateFullBlock(genesisState, pks, util.DefaultBlockGenConfig(), 2)
-	require.NoError(t, err)
-	b.Block.ParentRoot = service.originBlockRoot[:]
-	r, err := b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b)
-	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, ojc, ojc)
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
-	require.Equal(t, 3, fcs.NodeCount())
-
-	require.Equal(t, 0, service.cfg.AttPool.ForkchoiceAttestationCount())
-	require.NoError(t, err, service.UpdateHead(ctx))
-
-	require.Equal(t, 0, len(service.cfg.AttPool.ForkchoiceAttestations())) // Validate att pool is empty
-	require.Equal(t, r, service.head.root)                                 // Validate head is the new one
-
-}
--- a/beacon-chain/blockchain/receive_block.go
+++ b/beacon-chain/blockchain/receive_block.go
@@ -7,17 +7,16 @@ import (
 	"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/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/monitoring/tracing"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v3/runtime/version"
 	"github.com/prysmaticlabs/prysm/v3/time"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
 	"go.opencensus.io/trace"
 )

 // This defines how many epochs since finality the run time will begin to save hot state on to the DB.
-var epochsSinceFinalitySaveHotStateDB = primitives.Epoch(100)
+var epochsSinceFinalitySaveHotStateDB = types.Epoch(100)

 // BlockReceiver interface defines the methods of chain service for receiving and processing new blocks.
 type BlockReceiver interface {
@@ -33,9 +32,9 @@ 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()
@@ -146,16 +145,16 @@ 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)
 	}

-	// Mark block BLS changes as seen so we don't include same ones in future blocks.
-	if err := s.handleBlockBLSToExecChanges(b); err != nil {
-		return errors.Wrap(err, "could not process BLSToExecutionChanges")
-	}
-
 	//  Mark attester slashings as seen so we don't include same ones in future blocks.
 	for _, as := range b.Body().AttesterSlashings() {
 		s.cfg.SlashingPool.MarkIncludedAttesterSlashing(as)
@@ -163,26 +162,12 @@ func (s *Service) handlePostBlockOperations(b interfaces.BeaconBlock) error {
 	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 {
-		s.cfg.BLSToExecPool.MarkIncluded(change)
-	}
-	return nil
-}
-
 // This checks whether it's time to start saving hot state to DB.
 // It's time when there's `epochsSinceFinalitySaveHotStateDB` epochs of non-finality.
 func (s *Service) checkSaveHotStateDB(ctx context.Context) error {
 	currentEpoch := slots.ToEpoch(s.CurrentSlot())
 	// Prevent `sinceFinality` going underflow.
-	var sinceFinality primitives.Epoch
+	var sinceFinality types.Epoch
 	finalized := s.FinalizedCheckpt()
 	if finalized == nil {
 		return errNilFinalizedInStore
--- a/beacon-chain/blockchain/receive_block_test.go
+++ b/beacon-chain/blockchain/receive_block_test.go
@@ -8,15 +8,14 @@ import (

 	blockchainTesting "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/forkchoice/protoarray"
 	"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/voluntaryexits"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
 	"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/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/assert"
@@ -29,12 +28,12 @@ func TestService_ReceiveBlock(t *testing.T) {
 	ctx := context.Background()

 	genesis, keys := util.DeterministicGenesisState(t, 64)
-	genFullBlock := func(t *testing.T, conf *util.BlockGenConfig, slot primitives.Slot) *ethpb.SignedBeaconBlock {
+	genFullBlock := func(t *testing.T, conf *util.BlockGenConfig, slot types.Slot) *ethpb.SignedBeaconBlock {
 		blk, err := util.GenerateFullBlock(genesis, keys, conf, slot)
 		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)
@@ -128,14 +127,13 @@ func TestService_ReceiveBlock(t *testing.T) {
 			genesisBlockRoot := bytesutil.ToBytes32(nil)
 			require.NoError(t, beaconDB.SaveState(ctx, genesis, genesisBlockRoot))

-			fc := doublylinkedtree.New()
 			opts := []Option{
 				WithDatabase(beaconDB),
-				WithForkChoiceStore(fc),
+				WithForkChoiceStore(protoarray.New()),
 				WithAttestationPool(attestations.NewPool()),
 				WithExitPool(voluntaryexits.NewPool()),
 				WithStateNotifier(&blockchainTesting.MockStateNotifier{RecordEvents: true}),
-				WithStateGen(stategen.New(beaconDB, fc)),
+				WithStateGen(stategen.New(beaconDB)),
 				WithFinalizedStateAtStartUp(genesis),
 			}
 			s, err := NewService(ctx, opts...)
@@ -168,14 +166,13 @@ func TestService_ReceiveBlockUpdateHead(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	genesisBlockRoot := bytesutil.ToBytes32(nil)
 	require.NoError(t, beaconDB.SaveState(ctx, genesis, genesisBlockRoot))
-	fc := doublylinkedtree.New()
 	opts := []Option{
 		WithDatabase(beaconDB),
-		WithForkChoiceStore(fc),
+		WithForkChoiceStore(protoarray.New()),
 		WithAttestationPool(attestations.NewPool()),
 		WithExitPool(voluntaryexits.NewPool()),
 		WithStateNotifier(&blockchainTesting.MockStateNotifier{RecordEvents: true}),
-		WithStateGen(stategen.New(beaconDB, fc)),
+		WithStateGen(stategen.New(beaconDB)),
 	}

 	s, err := NewService(ctx, opts...)
@@ -205,7 +202,7 @@ func TestService_ReceiveBlockBatch(t *testing.T) {
 	ctx := context.Background()

 	genesis, keys := util.DeterministicGenesisState(t, 64)
-	genFullBlock := func(t *testing.T, conf *util.BlockGenConfig, slot primitives.Slot) *ethpb.SignedBeaconBlock {
+	genFullBlock := func(t *testing.T, conf *util.BlockGenConfig, slot types.Slot) *ethpb.SignedBeaconBlock {
 		blk, err := util.GenerateFullBlock(genesis, keys, conf, slot)
 		assert.NoError(t, err)
 		return blk
@@ -226,8 +223,8 @@ func TestService_ReceiveBlockBatch(t *testing.T) {
 				block: genFullBlock(t, util.DefaultBlockGenConfig(), 2 /*slot*/),
 			},
 			check: func(t *testing.T, s *Service) {
-				assert.Equal(t, primitives.Slot(2), s.head.state.Slot(), "Incorrect head state slot")
-				assert.Equal(t, primitives.Slot(2), s.head.block.Block().Slot(), "Incorrect head block slot")
+				assert.Equal(t, types.Slot(2), s.head.state.Slot(), "Incorrect head state slot")
+				assert.Equal(t, types.Slot(2), s.head.block.Block().Slot(), "Incorrect head block slot")
 			},
 		},
 		{
@@ -245,13 +242,12 @@ func TestService_ReceiveBlockBatch(t *testing.T) {

 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			fc := doublylinkedtree.New()
 			beaconDB := testDB.SetupDB(t)
 			opts := []Option{
 				WithDatabase(beaconDB),
-				WithForkChoiceStore(fc),
+				WithForkChoiceStore(protoarray.New()),
 				WithStateNotifier(&blockchainTesting.MockStateNotifier{RecordEvents: true}),
-				WithStateGen(stategen.New(beaconDB, fc)),
+				WithStateGen(stategen.New(beaconDB)),
 			}
 			s, err := NewService(ctx, opts...)
 			require.NoError(t, err)
@@ -333,62 +329,3 @@ func TestCheckSaveHotStateDB_Overflow(t *testing.T) {
 	require.NoError(t, s.checkSaveHotStateDB(context.Background()))
 	assert.LogsDoNotContain(t, hook, "Entering mode to save hot states in DB")
 }
-
-func TestHandleBlockBLSToExecutionChanges(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(&blockchainTesting.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 := blocks.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 := blocks.NewBeaconBlock(pbb)
-		require.NoError(t, err)
-		require.NoError(t, service.handleBlockBLSToExecChanges(blk))
-	})
-
-	t.Run("Post Capella some changes", func(t *testing.T) {
-		idx := primitives.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 := blocks.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))
-	})
-}
--- a/beacon-chain/blockchain/service.go
+++ b/beacon-chain/blockchain/service.go
@@ -23,7 +23,6 @@ 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"
@@ -33,7 +32,7 @@ import (
 	"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/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	prysmTime "github.com/prysmaticlabs/prysm/v3/time"
@@ -51,7 +50,7 @@ type Service struct {
 	head                    *head
 	headLock                sync.RWMutex
 	originBlockRoot         [32]byte // genesis root, or weak subjectivity checkpoint root, depending on how the node is initialized
-	nextEpochBoundarySlot   primitives.Slot
+	nextEpochBoundarySlot   types.Slot
 	boundaryRoots           [][32]byte
 	checkpointStateCache    *cache.CheckpointStateCache
 	initSyncBlocks          map[[32]byte]interfaces.SignedBeaconBlock
@@ -71,7 +70,6 @@ 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/blockchain/service_test.go
+++ b/beacon-chain/blockchain/service_test.go
@@ -21,10 +21,11 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/execution"
 	mockExecution "github.com/prysmaticlabs/prysm/v3/beacon-chain/execution/testing"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/doubly-linked-tree"
+	"github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/protoarray"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/operations/attestations"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/p2p"
-	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state/stategen"
+	v1 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v1"
 	"github.com/prysmaticlabs/prysm/v3/config/features"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	consensusblocks "github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
@@ -71,9 +72,6 @@ func (mb *mockBroadcaster) BroadcastSyncCommitteeMessage(_ context.Context, _ ui
 	return nil
 }

-func (mb *mockBroadcaster) BroadcastBLSChanges(_ context.Context, _ []*ethpb.SignedBLSToExecutionChange) {
-}
-
 var _ p2p.Broadcaster = (*mockBroadcaster)(nil)

 func setupBeaconChain(t *testing.T, beaconDB db.Database) *Service {
@@ -86,7 +84,7 @@ func setupBeaconChain(t *testing.T, beaconDB db.Database) *Service {
 		srv.Stop()
 	})
 	bState, _ := util.DeterministicGenesisState(t, 10)
-	pbState, err := state_native.ProtobufBeaconStatePhase0(bState.ToProtoUnsafe())
+	pbState, err := v1.ProtobufBeaconState(bState.InnerStateUnsafe())
 	require.NoError(t, err)
 	mockTrie, err := trie.NewTrie(0)
 	require.NoError(t, err)
@@ -120,8 +118,7 @@ func setupBeaconChain(t *testing.T, beaconDB db.Database) *Service {
 	depositCache, err := depositcache.New()
 	require.NoError(t, err)

-	fc := doublylinkedtree.New()
-	stateGen := stategen.New(beaconDB, fc)
+	stateGen := stategen.New(beaconDB)
 	// Safe a state in stategen to purposes of testing a service stop / shutdown.
 	require.NoError(t, stateGen.SaveState(ctx, bytesutil.ToBytes32(bState.FinalizedCheckpoint().Root), bState))

@@ -132,7 +129,7 @@ func setupBeaconChain(t *testing.T, beaconDB db.Database) *Service {
 		WithAttestationPool(attestations.NewPool()),
 		WithP2PBroadcaster(&mockBroadcaster{}),
 		WithStateNotifier(&mockBeaconNode{}),
-		WithForkChoiceStore(fc),
+		WithForkChoiceStore(doublylinkedtree.New()),
 		WithAttestationService(attService),
 		WithStateGen(stateGen),
 	}
@@ -309,10 +306,9 @@ func TestChainService_InitializeChainInfo(t *testing.T) {
 	require.NoError(t, beaconDB.SaveFinalizedCheckpoint(ctx, &ethpb.Checkpoint{Epoch: slots.ToEpoch(finalizedSlot), Root: headRoot[:]}))
 	attSrv, err := attestations.NewService(ctx, &attestations.Config{})
 	require.NoError(t, err)
-	fc := doublylinkedtree.New()
-	stateGen := stategen.New(beaconDB, fc)
+	stateGen := stategen.New(beaconDB)
 	c, err := NewService(ctx,
-		WithForkChoiceStore(fc),
+		WithForkChoiceStore(doublylinkedtree.New()),
 		WithDatabase(beaconDB),
 		WithStateGen(stateGen),
 		WithAttestationService(attSrv),
@@ -328,7 +324,7 @@ func TestChainService_InitializeChainInfo(t *testing.T) {
 	assert.DeepEqual(t, headBlock, pb, "Head block incorrect")
 	s, err := c.HeadState(ctx)
 	require.NoError(t, err)
-	assert.DeepSSZEqual(t, headState.ToProtoUnsafe(), s.ToProtoUnsafe(), "Head state incorrect")
+	assert.DeepSSZEqual(t, headState.InnerStateUnsafe(), s.InnerStateUnsafe(), "Head state incorrect")
 	assert.Equal(t, c.HeadSlot(), headBlock.Block.Slot, "Head slot incorrect")
 	r, err := c.HeadRoot(context.Background())
 	require.NoError(t, err)
@@ -369,10 +365,9 @@ func TestChainService_InitializeChainInfo_SetHeadAtGenesis(t *testing.T) {
 	}
 	require.NoError(t, beaconDB.SaveStateSummary(ctx, ss))
 	require.NoError(t, beaconDB.SaveFinalizedCheckpoint(ctx, &ethpb.Checkpoint{Root: headRoot[:], Epoch: slots.ToEpoch(finalizedSlot)}))
-	fc := doublylinkedtree.New()
-	stateGen := stategen.New(beaconDB, fc)
+	stateGen := stategen.New(beaconDB)
 	c, err := NewService(ctx,
-		WithForkChoiceStore(fc),
+		WithForkChoiceStore(doublylinkedtree.New()),
 		WithDatabase(beaconDB),
 		WithStateGen(stateGen),
 		WithAttestationService(attSrv),
@@ -383,7 +378,7 @@ func TestChainService_InitializeChainInfo_SetHeadAtGenesis(t *testing.T) {
 	require.NoError(t, c.StartFromSavedState(headState))
 	s, err := c.HeadState(ctx)
 	require.NoError(t, err)
-	assert.DeepSSZEqual(t, headState.ToProtoUnsafe(), s.ToProtoUnsafe(), "Head state incorrect")
+	assert.DeepSSZEqual(t, headState.InnerStateUnsafe(), s.InnerStateUnsafe(), "Head state incorrect")
 	assert.Equal(t, genesisRoot, c.originBlockRoot, "Genesis block root incorrect")
 	pb, err := c.head.block.Proto()
 	require.NoError(t, err)
@@ -393,9 +388,8 @@ func TestChainService_InitializeChainInfo_SetHeadAtGenesis(t *testing.T) {
 func TestChainService_SaveHeadNoDB(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	ctx := context.Background()
-	fc := doublylinkedtree.New()
 	s := &Service{
-		cfg: &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB, fc), ForkChoiceStore: fc},
+		cfg: &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB), ForkChoiceStore: doublylinkedtree.New()},
 	}
 	blk := util.NewBeaconBlock()
 	blk.Block.Slot = 1
@@ -415,6 +409,25 @@ func TestChainService_SaveHeadNoDB(t *testing.T) {
 	}
 }

+func TestHasBlock_ForkChoiceAndDB_ProtoArray(t *testing.T) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(t)
+	s := &Service{
+		cfg: &config{ForkChoiceStore: protoarray.New(), BeaconDB: beaconDB},
+	}
+	b := util.NewBeaconBlock()
+	r, err := b.Block.HashTreeRoot()
+	require.NoError(t, err)
+	beaconState, err := util.NewBeaconState()
+	require.NoError(t, err)
+	wsb, err := consensusblocks.NewSignedBeaconBlock(b)
+	require.NoError(t, err)
+	require.NoError(t, s.insertBlockToForkchoiceStore(ctx, wsb.Block(), r, beaconState))
+
+	assert.Equal(t, false, s.hasBlock(ctx, [32]byte{}), "Should not have block")
+	assert.Equal(t, true, s.hasBlock(ctx, r), "Should have block")
+}
+
 func TestHasBlock_ForkChoiceAndDB_DoublyLinkedTree(t *testing.T) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(t)
@@ -438,7 +451,7 @@ func TestServiceStop_SaveCachedBlocks(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	beaconDB := testDB.SetupDB(t)
 	s := &Service{
-		cfg:            &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB, doublylinkedtree.New())},
+		cfg:            &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB)},
 		ctx:            ctx,
 		cancel:         cancel,
 		initSyncBlocks: make(map[[32]byte]interfaces.SignedBeaconBlock),
@@ -486,6 +499,27 @@ func BenchmarkHasBlockDB(b *testing.B) {
 	}
 }

+func BenchmarkHasBlockForkChoiceStore_ProtoArray(b *testing.B) {
+	ctx := context.Background()
+	beaconDB := testDB.SetupDB(b)
+	s := &Service{
+		cfg: &config{ForkChoiceStore: protoarray.New(), BeaconDB: beaconDB},
+	}
+	blk := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}}}
+	r, err := blk.Block.HashTreeRoot()
+	require.NoError(b, err)
+	bs := &ethpb.BeaconState{FinalizedCheckpoint: &ethpb.Checkpoint{Root: make([]byte, 32)}, CurrentJustifiedCheckpoint: &ethpb.Checkpoint{Root: make([]byte, 32)}}
+	beaconState, err := v1.InitializeFromProto(bs)
+	require.NoError(b, err)
+	wsb, err := consensusblocks.NewSignedBeaconBlock(blk)
+	require.NoError(b, err)
+	require.NoError(b, s.insertBlockToForkchoiceStore(ctx, wsb.Block(), r, beaconState))
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		require.Equal(b, true, s.cfg.ForkChoiceStore.HasNode(r), "Block is not in fork choice store")
+	}
+}
 func BenchmarkHasBlockForkChoiceStore_DoublyLinkedTree(b *testing.B) {
 	ctx := context.Background()
 	beaconDB := testDB.SetupDB(b)
@@ -496,7 +530,7 @@ func BenchmarkHasBlockForkChoiceStore_DoublyLinkedTree(b *testing.B) {
 	r, err := blk.Block.HashTreeRoot()
 	require.NoError(b, err)
 	bs := &ethpb.BeaconState{FinalizedCheckpoint: &ethpb.Checkpoint{Root: make([]byte, 32)}, CurrentJustifiedCheckpoint: &ethpb.Checkpoint{Root: make([]byte, 32)}}
-	beaconState, err := state_native.InitializeFromProtoPhase0(bs)
+	beaconState, err := v1.InitializeFromProto(bs)
 	require.NoError(b, err)
 	wsb, err := consensusblocks.NewSignedBeaconBlock(blk)
 	require.NoError(b, err)
@@ -538,10 +572,9 @@ func TestChainService_EverythingOptimistic(t *testing.T) {
 	require.NoError(t, beaconDB.SaveFinalizedCheckpoint(ctx, &ethpb.Checkpoint{Epoch: slots.ToEpoch(finalizedSlot), Root: headRoot[:]}))
 	attSrv, err := attestations.NewService(ctx, &attestations.Config{})
 	require.NoError(t, err)
-	fc := doublylinkedtree.New()
-	stateGen := stategen.New(beaconDB, fc)
+	stateGen := stategen.New(beaconDB)
 	c, err := NewService(ctx,
-		WithForkChoiceStore(fc),
+		WithForkChoiceStore(doublylinkedtree.New()),
 		WithDatabase(beaconDB),
 		WithStateGen(stateGen),
 		WithAttestationService(attSrv),
--- a/beacon-chain/blockchain/state_balance_cache_test.go
+++ b/beacon-chain/blockchain/state_balance_cache_test.go
@@ -7,8 +7,8 @@ import (
 	"testing"

 	"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/consensus-types/primitives"
+	v2 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v2"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
@@ -23,7 +23,7 @@ func testStateWithValidators(v []*ethpb.Validator) testStateOpt {
 	}
 }

-func testStateWithSlot(slot primitives.Slot) testStateOpt {
+func testStateWithSlot(slot types.Slot) testStateOpt {
 	return func(a *ethpb.BeaconStateAltair) {
 		a.Slot = slot
 	}
@@ -34,7 +34,7 @@ func testStateFixture(opts ...testStateOpt) state.BeaconState {
 	for _, o := range opts {
 		o(a)
 	}
-	s, _ := state_native.InitializeFromProtoUnsafeAltair(a)
+	s, _ := v2.InitializeFromProtoUnsafe(a)
 	return s
 }

@@ -53,33 +53,33 @@ func generateTestValidators(count int, opts ...func(*ethpb.Validator)) []*ethpb.
 	return vs
 }

-func oddValidatorsExpired(currentSlot primitives.Slot) func(*ethpb.Validator) {
+func oddValidatorsExpired(currentSlot types.Slot) func(*ethpb.Validator) {
 	return func(v *ethpb.Validator) {
 		pki := binary.LittleEndian.Uint64(v.PublicKey)
 		if pki%2 == 0 {
-			v.ExitEpoch = primitives.Epoch(int(slots.ToEpoch(currentSlot)) + 1)
+			v.ExitEpoch = types.Epoch(int(slots.ToEpoch(currentSlot)) + 1)
 		} else {
-			v.ExitEpoch = primitives.Epoch(int(slots.ToEpoch(currentSlot)) - 1)
+			v.ExitEpoch = types.Epoch(int(slots.ToEpoch(currentSlot)) - 1)
 		}
 	}
 }

-func oddValidatorsQueued(currentSlot primitives.Slot) func(*ethpb.Validator) {
+func oddValidatorsQueued(currentSlot types.Slot) func(*ethpb.Validator) {
 	return func(v *ethpb.Validator) {
-		v.ExitEpoch = primitives.Epoch(int(slots.ToEpoch(currentSlot)) + 1)
+		v.ExitEpoch = types.Epoch(int(slots.ToEpoch(currentSlot)) + 1)
 		pki := binary.LittleEndian.Uint64(v.PublicKey)
 		if pki%2 == 0 {
-			v.ActivationEpoch = primitives.Epoch(int(slots.ToEpoch(currentSlot)) - 1)
+			v.ActivationEpoch = types.Epoch(int(slots.ToEpoch(currentSlot)) - 1)
 		} else {
-			v.ActivationEpoch = primitives.Epoch(int(slots.ToEpoch(currentSlot)) + 1)
+			v.ActivationEpoch = types.Epoch(int(slots.ToEpoch(currentSlot)) + 1)
 		}
 	}
 }

-func allValidatorsValid(currentSlot primitives.Slot) func(*ethpb.Validator) {
+func allValidatorsValid(currentSlot types.Slot) func(*ethpb.Validator) {
 	return func(v *ethpb.Validator) {
-		v.ActivationEpoch = primitives.Epoch(int(slots.ToEpoch(currentSlot)) - 1)
-		v.ExitEpoch = primitives.Epoch(int(slots.ToEpoch(currentSlot)) + 1)
+		v.ActivationEpoch = types.Epoch(int(slots.ToEpoch(currentSlot)) - 1)
+		v.ExitEpoch = types.Epoch(int(slots.ToEpoch(currentSlot)) + 1)
 	}
 }

@@ -91,21 +91,21 @@ func balanceIsKeyTimes2(v *ethpb.Validator) {
 func testHalfExpiredValidators() ([]*ethpb.Validator, []uint64) {
 	balances := []uint64{0, 0, 4, 0, 8, 0, 12, 0, 16, 0}
 	return generateTestValidators(10,
-		oddValidatorsExpired(primitives.Slot(99)),
+		oddValidatorsExpired(types.Slot(99)),
 		balanceIsKeyTimes2), balances
 }

 func testHalfQueuedValidators() ([]*ethpb.Validator, []uint64) {
 	balances := []uint64{0, 0, 4, 0, 8, 0, 12, 0, 16, 0}
 	return generateTestValidators(10,
-		oddValidatorsQueued(primitives.Slot(99)),
+		oddValidatorsQueued(types.Slot(99)),
 		balanceIsKeyTimes2), balances
 }

 func testAllValidValidators() ([]*ethpb.Validator, []uint64) {
 	balances := []uint64{0, 2, 4, 6, 8, 10, 12, 14, 16, 18}
 	return generateTestValidators(10,
-		allValidatorsValid(primitives.Slot(99)),
+		allValidatorsValid(types.Slot(99)),
 		balanceIsKeyTimes2), balances
 }

--- a/beacon-chain/blockchain/testing/mock.go
+++ b/beacon-chain/blockchain/testing/mock.go
@@ -22,7 +22,7 @@ import (
 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
 	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/sirupsen/logrus"
@@ -39,7 +39,7 @@ type ChainService struct {
 	FinalizedCheckPoint         *ethpb.Checkpoint
 	CurrentJustifiedCheckPoint  *ethpb.Checkpoint
 	PreviousJustifiedCheckPoint *ethpb.Checkpoint
-	Slot                        *primitives.Slot // Pointer because 0 is a useful value, so checking against it can be incorrect.
+	Slot                        *types.Slot // Pointer because 0 is a useful value, so checking against it can be incorrect.
 	Balance                     *precompute.Balance
 	CanonicalRoots              map[[32]byte]bool
 	Fork                        *ethpb.Fork
@@ -51,7 +51,7 @@ type ChainService struct {
 	VerifyBlkDescendantErr      error
 	stateNotifier               statefeed.Notifier
 	BlocksReceived              []interfaces.SignedBeaconBlock
-	SyncCommitteeIndices        []primitives.CommitteeIndex
+	SyncCommitteeIndices        []types.CommitteeIndex
 	blockNotifier               blockfeed.Notifier
 	opNotifier                  opfeed.Notifier
 	Root                        []byte
@@ -174,8 +174,7 @@ func (s *ChainService) ReceiveBlockInitialSync(ctx context.Context, block interf
 	if s.State == nil {
 		return ErrNilState
 	}
-	parentRoot := block.Block().ParentRoot()
-	if !bytes.Equal(s.Root, parentRoot[:]) {
+	if !bytes.Equal(s.Root, block.Block().ParentRoot()) {
 		return errors.Errorf("wanted %#x but got %#x", s.Root, block.Block().ParentRoot())
 	}
 	if err := s.State.SetSlot(block.Block().Slot()); err != nil {
@@ -203,8 +202,7 @@ func (s *ChainService) ReceiveBlockBatch(ctx context.Context, blks []interfaces.
 		return ErrNilState
 	}
 	for _, b := range blks {
-		parentRoot := b.Block().ParentRoot()
-		if !bytes.Equal(s.Root, parentRoot[:]) {
+		if !bytes.Equal(s.Root, b.Block().ParentRoot()) {
 			return errors.Errorf("wanted %#x but got %#x", s.Root, b.Block().ParentRoot())
 		}
 		if err := s.State.SetSlot(b.Block().Slot()); err != nil {
@@ -235,8 +233,7 @@ func (s *ChainService) ReceiveBlock(ctx context.Context, block interfaces.Signed
 	if s.State == nil {
 		return ErrNilState
 	}
-	parentRoot := block.Block().ParentRoot()
-	if !bytes.Equal(s.Root, parentRoot[:]) {
+	if !bytes.Equal(s.Root, block.Block().ParentRoot()) {
 		return errors.Errorf("wanted %#x but got %#x", s.Root, block.Block().ParentRoot())
 	}
 	if err := s.State.SetSlot(block.Block().Slot()); err != nil {
@@ -259,7 +256,7 @@ func (s *ChainService) ReceiveBlock(ctx context.Context, block interfaces.Signed
 }

 // HeadSlot mocks HeadSlot method in chain service.
-func (s *ChainService) HeadSlot() primitives.Slot {
+func (s *ChainService) HeadSlot() types.Slot {
 	if s.State == nil {
 		return 0
 	}
@@ -315,9 +312,9 @@ func (s *ChainService) AttestationTargetState(_ context.Context, _ *ethpb.Checkp
 }

 // HeadValidatorsIndices mocks the same method in the chain service.
-func (s *ChainService) HeadValidatorsIndices(ctx context.Context, epoch primitives.Epoch) ([]primitives.ValidatorIndex, error) {
+func (s *ChainService) HeadValidatorsIndices(ctx context.Context, epoch types.Epoch) ([]types.ValidatorIndex, error) {
 	if s.State == nil {
-		return []primitives.ValidatorIndex{}, nil
+		return []types.ValidatorIndex{}, nil
 	}
 	return helpers.ActiveValidatorIndices(ctx, s.State, epoch)
 }
@@ -338,11 +335,11 @@ func (s *ChainService) GenesisValidatorsRoot() [32]byte {
 }

 // CurrentSlot mocks the same method in the chain service.
-func (s *ChainService) CurrentSlot() primitives.Slot {
+func (s *ChainService) CurrentSlot() types.Slot {
 	if s.Slot != nil {
 		return *s.Slot
 	}
-	return primitives.Slot(uint64(time.Now().Unix()-s.Genesis.Unix()) / params.BeaconConfig().SecondsPerSlot)
+	return types.Slot(uint64(time.Now().Unix()-s.Genesis.Unix()) / params.BeaconConfig().SecondsPerSlot)
 }

 // Participation mocks the same method in the chain service.
@@ -406,46 +403,46 @@ func (s *ChainService) VerifyFinalizedConsistency(_ context.Context, r []byte) e
 }

 // ChainHeads mocks ChainHeads and always return nil.
-func (_ *ChainService) ChainHeads() ([][32]byte, []primitives.Slot) {
+func (_ *ChainService) ChainHeads() ([][32]byte, []types.Slot) {
 	return [][32]byte{
 			bytesutil.ToBytes32(bytesutil.PadTo([]byte("foo"), 32)),
 			bytesutil.ToBytes32(bytesutil.PadTo([]byte("bar"), 32)),
 		},
-		[]primitives.Slot{0, 1}
+		[]types.Slot{0, 1}
 }

 // HeadPublicKeyToValidatorIndex mocks HeadPublicKeyToValidatorIndex and always return 0 and true.
-func (_ *ChainService) HeadPublicKeyToValidatorIndex(_ [fieldparams.BLSPubkeyLength]byte) (primitives.ValidatorIndex, bool) {
+func (_ *ChainService) HeadPublicKeyToValidatorIndex(_ [fieldparams.BLSPubkeyLength]byte) (types.ValidatorIndex, bool) {
 	return 0, true
 }

 // HeadValidatorIndexToPublicKey mocks HeadValidatorIndexToPublicKey and always return empty and nil.
-func (s *ChainService) HeadValidatorIndexToPublicKey(_ context.Context, _ primitives.ValidatorIndex) ([fieldparams.BLSPubkeyLength]byte, error) {
+func (s *ChainService) HeadValidatorIndexToPublicKey(_ context.Context, _ types.ValidatorIndex) ([fieldparams.BLSPubkeyLength]byte, error) {
 	return s.PublicKey, nil
 }

 // HeadSyncCommitteeIndices mocks HeadSyncCommitteeIndices and always return `HeadNextSyncCommitteeIndices`.
-func (s *ChainService) HeadSyncCommitteeIndices(_ context.Context, _ primitives.ValidatorIndex, _ primitives.Slot) ([]primitives.CommitteeIndex, error) {
+func (s *ChainService) HeadSyncCommitteeIndices(_ context.Context, _ types.ValidatorIndex, _ types.Slot) ([]types.CommitteeIndex, error) {
 	return s.SyncCommitteeIndices, nil
 }

 // HeadSyncCommitteePubKeys mocks HeadSyncCommitteePubKeys and always return empty nil.
-func (s *ChainService) HeadSyncCommitteePubKeys(_ context.Context, _ primitives.Slot, _ primitives.CommitteeIndex) ([][]byte, error) {
+func (s *ChainService) HeadSyncCommitteePubKeys(_ context.Context, _ types.Slot, _ types.CommitteeIndex) ([][]byte, error) {
 	return s.SyncCommitteePubkeys, nil
 }

 // HeadSyncCommitteeDomain mocks HeadSyncCommitteeDomain and always return empty nil.
-func (s *ChainService) HeadSyncCommitteeDomain(_ context.Context, _ primitives.Slot) ([]byte, error) {
+func (s *ChainService) HeadSyncCommitteeDomain(_ context.Context, _ types.Slot) ([]byte, error) {
 	return s.SyncCommitteeDomain, nil
 }

 // HeadSyncSelectionProofDomain mocks HeadSyncSelectionProofDomain and always return empty nil.
-func (s *ChainService) HeadSyncSelectionProofDomain(_ context.Context, _ primitives.Slot) ([]byte, error) {
+func (s *ChainService) HeadSyncSelectionProofDomain(_ context.Context, _ types.Slot) ([]byte, error) {
 	return s.SyncSelectionProofDomain, nil
 }

 // HeadSyncContributionProofDomain mocks HeadSyncContributionProofDomain and always return empty nil.
-func (s *ChainService) HeadSyncContributionProofDomain(_ context.Context, _ primitives.Slot) ([]byte, error) {
+func (s *ChainService) HeadSyncContributionProofDomain(_ context.Context, _ types.Slot) ([]byte, error) {
 	return s.SyncContributionProofDomain, nil
 }

--- a/beacon-chain/blockchain/weak_subjectivity_checks.go
+++ b/beacon-chain/blockchain/weak_subjectivity_checks.go
@@ -7,7 +7,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/db/filters"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/time/slots"
@@ -22,8 +22,8 @@ type WeakSubjectivityVerifier struct {
 	enabled  bool
 	verified bool
 	root     [32]byte
-	epoch    primitives.Epoch
-	slot     primitives.Slot
+	epoch    types.Epoch
+	slot     types.Slot
 	db       weakSubjectivityDB
 }

@@ -51,7 +51,7 @@ func NewWeakSubjectivityVerifier(wsc *ethpb.Checkpoint, db weakSubjectivityDB) (

 // VerifyWeakSubjectivity verifies the weak subjectivity root in the service struct.
 // Reference design: https://github.com/ethereum/consensus-specs/blob/master/specs/phase0/weak-subjectivity.md#weak-subjectivity-sync-procedure
-func (v *WeakSubjectivityVerifier) VerifyWeakSubjectivity(ctx context.Context, finalizedEpoch primitives.Epoch) error {
+func (v *WeakSubjectivityVerifier) VerifyWeakSubjectivity(ctx context.Context, finalizedEpoch types.Epoch) error {
 	if v.verified || !v.enabled {
 		return nil
 	}
--- a/beacon-chain/blockchain/weak_subjectivity_checks_test.go
+++ b/beacon-chain/blockchain/weak_subjectivity_checks_test.go
@@ -6,10 +6,10 @@ import (

 	"github.com/pkg/errors"
 	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/forkchoice/protoarray"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v3/beacon-chain/forkchoice/types"
 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
@@ -32,7 +32,7 @@ func TestService_VerifyWeakSubjectivityRoot(t *testing.T) {
 		disabled       bool
 		wantErr        error
 		checkpt        *ethpb.Checkpoint
-		finalizedEpoch primitives.Epoch
+		finalizedEpoch types.Epoch
 		name           string
 	}{
 		{
@@ -72,7 +72,7 @@ func TestService_VerifyWeakSubjectivityRoot(t *testing.T) {
 			wv, err := NewWeakSubjectivityVerifier(tt.checkpt, beaconDB)
 			require.Equal(t, !tt.disabled, wv.enabled)
 			require.NoError(t, err)
-			fcs := doublylinkedtree.New()
+			fcs := protoarray.New()
 			s := &Service{
 				cfg:        &config{BeaconDB: beaconDB, WeakSubjectivityCheckpt: tt.checkpt, ForkChoiceStore: fcs},
 				wsVerifier: wv,
--- a/beacon-chain/builder/BUILD.bazel
+++ b/beacon-chain/builder/BUILD.bazel
@@ -1,4 +1,4 @@
-load("@prysm//tools/go:def.bzl", "go_library", "go_test")
+load("@prysm//tools/go:def.bzl", "go_library")

 go_library(
    name = "go_default_library",
@@ -14,9 +14,11 @@ go_library(
        "//beacon-chain/blockchain:go_default_library",
        "//beacon-chain/db:go_default_library",
        "//cmd/beacon-chain/flags:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
+        "//network:go_default_library",
+        "//network/authorization:go_default_library",
+        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
        "@com_github_prometheus_client_golang//prometheus:go_default_library",
@@ -26,18 +28,3 @@ go_library(
        "@io_opencensus_go//trace:go_default_library",
    ],
 )
-
-go_test(
-    name = "go_default_test",
-    srcs = ["service_test.go"],
-    embed = [":go_default_library"],
-    deps = [
-        "//api/client/builder/testing:go_default_library",
-        "//beacon-chain/blockchain/testing:go_default_library",
-        "//beacon-chain/db/testing:go_default_library",
-        "//encoding/bytesutil:go_default_library",
-        "//proto/prysm/v1alpha1:go_default_library",
-        "//testing/assert:go_default_library",
-        "//testing/require:go_default_library",
-    ],
-)
--- a/beacon-chain/builder/metric.go
+++ b/beacon-chain/builder/metric.go
@@ -20,6 +20,13 @@ var (
 			Buckets: []float64{1, 2, 5, 10, 20, 50, 100, 200, 500, 1000},
 		},
 	)
+	getStatusLatency = promauto.NewHistogram(
+		prometheus.HistogramOpts{
+			Name:    "get_status_latency_milliseconds",
+			Help:    "Captures RPC latency for get status in milliseconds",
+			Buckets: []float64{1, 2, 5, 10, 20, 50, 100, 200, 500, 1000},
+		},
+	)
 	registerValidatorLatency = promauto.NewHistogram(
 		prometheus.HistogramOpts{
 			Name:    "register_validator_latency_milliseconds",
--- a/beacon-chain/builder/option.go
+++ b/beacon-chain/builder/option.go
@@ -1,10 +1,11 @@
 package builder

 import (
-	"github.com/prysmaticlabs/prysm/v3/api/client/builder"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/blockchain"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/db"
 	"github.com/prysmaticlabs/prysm/v3/cmd/beacon-chain/flags"
+	"github.com/prysmaticlabs/prysm/v3/network"
+	"github.com/prysmaticlabs/prysm/v3/network/authorization"
 	"github.com/urfave/cli/v2"
 )

@@ -13,30 +14,22 @@ type Option func(s *Service) error
 // FlagOptions for builder service flag configurations.
 func FlagOptions(c *cli.Context) ([]Option, error) {
 	endpoint := c.String(flags.MevRelayEndpoint.Name)
-	var client *builder.Client
-	if endpoint != "" {
-		var err error
-		client, err = builder.NewClient(endpoint)
-		if err != nil {
-			return nil, err
-		}
-	}
 	opts := []Option{
-		WithBuilderClient(client),
+		WithBuilderEndpoints(endpoint),
 	}
 	return opts, nil
 }

-// WithBuilderClient sets the builder client for the beacon chain builder service.
-func WithBuilderClient(client builder.BuilderClient) Option {
+// WithBuilderEndpoints sets the endpoint for the beacon chain builder service.
+func WithBuilderEndpoints(endpoint string) Option {
 	return func(s *Service) error {
-		s.cfg.builderClient = client
+		s.cfg.builderEndpoint = covertEndPoint(endpoint)
 		return nil
 	}
 }

 // WithHeadFetcher gets the head info from chain service.
-func WithHeadFetcher(svc blockchain.HeadFetcher) Option {
+func WithHeadFetcher(svc *blockchain.Service) Option {
 	return func(s *Service) error {
 		s.cfg.headFetcher = svc
 		return nil
@@ -50,3 +43,12 @@ func WithDatabase(beaconDB db.HeadAccessDatabase) Option {
 		return nil
 	}
 }
+
+func covertEndPoint(ep string) network.Endpoint {
+	return network.Endpoint{
+		Url: ep,
+		Auth: network.AuthorizationData{ // Auth is not used for builder.
+			Method: authorization.None,
+			Value:  "",
+		}}
+}
--- a/beacon-chain/builder/service.go
+++ b/beacon-chain/builder/service.go
@@ -2,16 +2,16 @@ package builder

 import (
 	"context"
-	"reflect"
 	"time"

 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v3/api/client/builder"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/blockchain"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/db"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v3/network"
+	v1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	log "github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
@@ -22,23 +22,23 @@ var ErrNoBuilder = errors.New("builder endpoint not configured")

 // BlockBuilder defines the interface for interacting with the block builder
 type BlockBuilder interface {
-	SubmitBlindedBlock(ctx context.Context, block interfaces.SignedBeaconBlock) (interfaces.ExecutionData, error)
-	GetHeader(ctx context.Context, slot primitives.Slot, parentHash [32]byte, pubKey [48]byte) (builder.SignedBid, error)
+	SubmitBlindedBlock(ctx context.Context, block *ethpb.SignedBlindedBeaconBlockBellatrix) (*v1.ExecutionPayload, error)
+	GetHeader(ctx context.Context, slot types.Slot, parentHash [32]byte, pubKey [48]byte) (*ethpb.SignedBuilderBid, error)
 	RegisterValidator(ctx context.Context, reg []*ethpb.SignedValidatorRegistrationV1) error
 	Configured() bool
 }

 // config defines a config struct for dependencies into the service.
 type config struct {
-	builderClient builder.BuilderClient
-	beaconDB      db.HeadAccessDatabase
-	headFetcher   blockchain.HeadFetcher
+	builderEndpoint network.Endpoint
+	beaconDB        db.HeadAccessDatabase
+	headFetcher     blockchain.HeadFetcher
 }

 // Service defines a service that provides a client for interacting with the beacon chain and MEV relay network.
 type Service struct {
 	cfg    *config
-	c      builder.BuilderClient
+	c      *builder.Client
 	ctx    context.Context
 	cancel context.CancelFunc
 }
@@ -56,14 +56,18 @@ func NewService(ctx context.Context, opts ...Option) (*Service, error) {
 			return nil, err
 		}
 	}
-	if s.cfg.builderClient != nil && !reflect.ValueOf(s.cfg.builderClient).IsNil() {
-		s.c = s.cfg.builderClient
+	if s.cfg.builderEndpoint.Url != "" {
+		c, err := builder.NewClient(s.cfg.builderEndpoint.Url)
+		if err != nil {
+			return nil, err
+		}
+		s.c = c

 		// Is the builder up?
 		if err := s.c.Status(ctx); err != nil {
 			log.WithError(err).Error("Failed to check builder status")
 		} else {
-			log.WithField("endpoint", s.c.NodeURL()).Info("Builder has been configured")
+			log.WithField("endpoint", c.NodeURL()).Info("Builder has been configured")
 			log.Warn("Outsourcing block construction to external builders adds non-trivial delay to block propagation time.  " +
 				"Builder-constructed blocks or fallback blocks may get orphaned. Use at your own risk!")
 		}
@@ -72,9 +76,7 @@ func NewService(ctx context.Context, opts ...Option) (*Service, error) {
 }

 // Start initializes the service.
-func (s *Service) Start() {
-	go s.pollRelayerStatus(s.ctx)
-}
+func (*Service) Start() {}

 // Stop halts the service.
 func (*Service) Stop() error {
@@ -82,7 +84,7 @@ func (*Service) Stop() error {
 }

 // SubmitBlindedBlock submits a blinded block to the builder relay network.
-func (s *Service) SubmitBlindedBlock(ctx context.Context, b interfaces.SignedBeaconBlock) (interfaces.ExecutionData, error) {
+func (s *Service) SubmitBlindedBlock(ctx context.Context, b *ethpb.SignedBlindedBeaconBlockBellatrix) (*v1.ExecutionPayload, error) {
 	ctx, span := trace.StartSpan(ctx, "builder.SubmitBlindedBlock")
 	defer span.End()
 	start := time.Now()
@@ -94,7 +96,7 @@ func (s *Service) SubmitBlindedBlock(ctx context.Context, b interfaces.SignedBea
 }

 // GetHeader retrieves the header for a given slot and parent hash from the builder relay network.
-func (s *Service) GetHeader(ctx context.Context, slot primitives.Slot, parentHash [32]byte, pubKey [48]byte) (builder.SignedBid, error) {
+func (s *Service) GetHeader(ctx context.Context, slot types.Slot, parentHash [32]byte, pubKey [48]byte) (*ethpb.SignedBuilderBid, error) {
 	ctx, span := trace.StartSpan(ctx, "builder.GetHeader")
 	defer span.End()
 	start := time.Now()
@@ -107,12 +109,19 @@ func (s *Service) GetHeader(ctx context.Context, slot primitives.Slot, parentHas

 // Status retrieves the status of the builder relay network.
 func (s *Service) Status() error {
+	ctx, span := trace.StartSpan(context.Background(), "builder.Status")
+	defer span.End()
+	start := time.Now()
+	defer func() {
+		getStatusLatency.Observe(float64(time.Since(start).Milliseconds()))
+	}()
+
 	// Return early if builder isn't initialized in service.
 	if s.c == nil {
 		return nil
 	}

-	return nil
+	return s.c.Status(ctx)
 }

 // RegisterValidator registers a validator with the builder relay network.
@@ -125,7 +134,7 @@ func (s *Service) RegisterValidator(ctx context.Context, reg []*ethpb.SignedVali
 		registerValidatorLatency.Observe(float64(time.Since(start).Milliseconds()))
 	}()

-	idxs := make([]primitives.ValidatorIndex, 0)
+	idxs := make([]types.ValidatorIndex, 0)
 	msgs := make([]*ethpb.ValidatorRegistrationV1, 0)
 	valid := make([]*ethpb.SignedValidatorRegistrationV1, 0)
 	for i := 0; i < len(reg); i++ {
@@ -148,24 +157,7 @@ func (s *Service) RegisterValidator(ctx context.Context, reg []*ethpb.SignedVali
 	return s.cfg.beaconDB.SaveRegistrationsByValidatorIDs(ctx, idxs, msgs)
 }

-// Configured returns true if the user has configured a builder client.
+// Configured returns true if the user has input a builder URL.
 func (s *Service) Configured() bool {
-	return s.c != nil && !reflect.ValueOf(s.c).IsNil()
-}
-
-func (s *Service) pollRelayerStatus(ctx context.Context) {
-	ticker := time.NewTicker(time.Minute)
-	defer ticker.Stop()
-	for {
-		select {
-		case <-ticker.C:
-			if s.c != nil {
-				if err := s.c.Status(ctx); err != nil {
-					log.WithError(err).Error("Failed to call relayer status endpoint, perhaps mev-boost or relayers are down")
-				}
-			}
-		case <-ctx.Done():
-			return
-		}
-	}
+	return s.cfg.builderEndpoint.Url != ""
 }
--- a/beacon-chain/builder/service_test.go
+++ b/beacon-chain/builder/service_test.go
@@ -1,39 +0,0 @@
-package builder
-
-import (
-	"context"
-	"testing"
-
-	buildertesting "github.com/prysmaticlabs/prysm/v3/api/client/builder/testing"
-	blockchainTesting "github.com/prysmaticlabs/prysm/v3/beacon-chain/blockchain/testing"
-	dbtesting "github.com/prysmaticlabs/prysm/v3/beacon-chain/db/testing"
-	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
-	eth "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v3/testing/assert"
-	"github.com/prysmaticlabs/prysm/v3/testing/require"
-)
-
-func Test_NewServiceWithBuilder(t *testing.T) {
-	s, err := NewService(context.Background(), WithBuilderClient(&buildertesting.MockClient{}))
-	require.NoError(t, err)
-	assert.Equal(t, true, s.Configured())
-}
-
-func Test_NewServiceWithoutBuilder(t *testing.T) {
-	s, err := NewService(context.Background())
-	require.NoError(t, err)
-	assert.Equal(t, false, s.Configured())
-}
-
-func Test_RegisterValidator(t *testing.T) {
-	ctx := context.Background()
-	db := dbtesting.SetupDB(t)
-	headFetcher := &blockchainTesting.ChainService{}
-	builder := buildertesting.NewClient()
-	s, err := NewService(ctx, WithDatabase(db), WithHeadFetcher(headFetcher), WithBuilderClient(&builder))
-	require.NoError(t, err)
-	pubkey := bytesutil.ToBytes48([]byte("pubkey"))
-	var feeRecipient [20]byte
-	require.NoError(t, s.RegisterValidator(ctx, []*eth.SignedValidatorRegistrationV1{{Message: &eth.ValidatorRegistrationV1{Pubkey: pubkey[:], FeeRecipient: feeRecipient[:]}}}))
-	assert.Equal(t, true, builder.RegisteredVals[pubkey])
-}
--- a/beacon-chain/builder/testing/BUILD.bazel
+++ b/beacon-chain/builder/testing/BUILD.bazel
@@ -7,12 +7,8 @@ go_library(
    importpath = "github.com/prysmaticlabs/prysm/v3/beacon-chain/builder/testing",
    visibility = ["//visibility:public"],
    deps = [
-        "//api/client/builder:go_default_library",
-        "//consensus-types/blocks:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
-        "@com_github_pkg_errors//:go_default_library",
    ],
 )
--- a/beacon-chain/builder/testing/mock.go
+++ b/beacon-chain/builder/testing/mock.go
@@ -3,11 +3,7 @@ package testing
 import (
 	"context"

-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v3/api/client/builder"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	v1 "github.com/prysmaticlabs/prysm/v3/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 )
@@ -28,21 +24,13 @@ func (s *MockBuilderService) Configured() bool {
 }

 // SubmitBlindedBlock for mocking.
-func (s *MockBuilderService) SubmitBlindedBlock(_ context.Context, _ interfaces.SignedBeaconBlock) (interfaces.ExecutionData, error) {
-	w, err := blocks.WrappedExecutionPayload(s.Payload)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not wrap payload")
-	}
-	return w, s.ErrSubmitBlindedBlock
+func (s *MockBuilderService) SubmitBlindedBlock(context.Context, *ethpb.SignedBlindedBeaconBlockBellatrix) (*v1.ExecutionPayload, error) {
+	return s.Payload, s.ErrSubmitBlindedBlock
 }

 // GetHeader for mocking.
-func (s *MockBuilderService) GetHeader(context.Context, primitives.Slot, [32]byte, [48]byte) (builder.SignedBid, error) {
-	w, err := builder.WrappedSignedBuilderBid(s.Bid)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not wrap bid")
-	}
-	return w, s.ErrGetHeader
+func (s *MockBuilderService) GetHeader(context.Context, types.Slot, [32]byte, [48]byte) (*ethpb.SignedBuilderBid, error) {
+	return s.Bid, s.ErrGetHeader
 }

 // RegisterValidator for mocking.
--- a/beacon-chain/cache/BUILD.bazel
+++ b/beacon-chain/cache/BUILD.bazel
@@ -73,7 +73,9 @@ go_test(
    embed = [":go_default_library"],
    deps = [
        "//beacon-chain/state:go_default_library",
-        "//beacon-chain/state/state-native:go_default_library",
+        "//beacon-chain/state/v1:go_default_library",
+        "//beacon-chain/state/v2:go_default_library",
+        "//beacon-chain/state/v3:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
--- a/beacon-chain/cache/active_balance.go
+++ b/beacon-chain/cache/active_balance.go
@@ -13,7 +13,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	lruwrpr "github.com/prysmaticlabs/prysm/v3/cache/lru"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	ethTypes "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 )

 const (
@@ -90,7 +90,7 @@ func balanceCacheKey(st state.ReadOnlyBeaconState) (string, error) {
 		// impossible condition due to early division
 		return "", errors.Errorf("start slot calculation overflows: %v", err)
 	}
-	prevSlot := primitives.Slot(0)
+	prevSlot := ethTypes.Slot(0)
 	if epochStartSlot > 1 {
 		prevSlot = epochStartSlot - 1
 	}
--- a/beacon-chain/cache/active_balance_test.go
+++ b/beacon-chain/cache/active_balance_test.go
@@ -7,9 +7,9 @@ import (
 	"math"
 	"testing"

-	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
+	state "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v1"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 )
@@ -24,7 +24,7 @@ func TestBalanceCache_AddGetBalance(t *testing.T) {
 	raw := &ethpb.BeaconState{
 		BlockRoots: blockRoots,
 	}
-	st, err := state_native.InitializeFromProtoPhase0(raw)
+	st, err := state.InitializeFromProto(raw)
 	require.NoError(t, err)

 	cache := NewEffectiveBalanceCache()
@@ -68,9 +68,9 @@ func TestBalanceCache_BalanceKey(t *testing.T) {
 	raw := &ethpb.BeaconState{
 		BlockRoots: blockRoots,
 	}
-	st, err := state_native.InitializeFromProtoPhase0(raw)
+	st, err := state.InitializeFromProto(raw)
 	require.NoError(t, err)
-	require.NoError(t, st.SetSlot(primitives.Slot(math.MaxUint64)))
+	require.NoError(t, st.SetSlot(types.Slot(math.MaxUint64)))

 	_, err = balanceCacheKey(st)
 	require.NoError(t, err)
--- a/beacon-chain/cache/checkpoint_state.go
+++ b/beacon-chain/cache/checkpoint_state.go
@@ -1,6 +1,8 @@
 package cache

 import (
+	"sync"
+
 	lru "github.com/hashicorp/golang-lru"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
@@ -30,6 +32,7 @@ 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.
@@ -42,6 +45,8 @@ 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
@@ -62,6 +67,8 @@ 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/checkpoint_state_test.go
+++ b/beacon-chain/cache/checkpoint_state_test.go
@@ -4,9 +4,9 @@ import (
 	"testing"

 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
-	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
+	v1 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v1"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/assert"
@@ -18,7 +18,7 @@ func TestCheckpointStateCache_StateByCheckpoint(t *testing.T) {
 	cache := NewCheckpointStateCache()

 	cp1 := &ethpb.Checkpoint{Epoch: 1, Root: bytesutil.PadTo([]byte{'A'}, 32)}
-	st, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
+	st, err := v1.InitializeFromProto(&ethpb.BeaconState{
 		GenesisValidatorsRoot: params.BeaconConfig().ZeroHash[:],
 		Slot:                  64,
 	})
@@ -33,16 +33,16 @@ func TestCheckpointStateCache_StateByCheckpoint(t *testing.T) {
 	s, err = cache.StateByCheckpoint(cp1)
 	require.NoError(t, err)

-	pbState1, err := state_native.ProtobufBeaconStatePhase0(s.ToProtoUnsafe())
+	pbState1, err := v1.ProtobufBeaconState(s.InnerStateUnsafe())
 	require.NoError(t, err)
-	pbstate, err := state_native.ProtobufBeaconStatePhase0(st.ToProtoUnsafe())
+	pbstate, err := v1.ProtobufBeaconState(st.InnerStateUnsafe())
 	require.NoError(t, err)
 	if !proto.Equal(pbState1, pbstate) {
 		t.Error("incorrectly cached state")
 	}

 	cp2 := &ethpb.Checkpoint{Epoch: 2, Root: bytesutil.PadTo([]byte{'B'}, 32)}
-	st2, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
+	st2, err := v1.InitializeFromProto(&ethpb.BeaconState{
 		Slot: 128,
 	})
 	require.NoError(t, err)
@@ -50,23 +50,23 @@ func TestCheckpointStateCache_StateByCheckpoint(t *testing.T) {

 	s, err = cache.StateByCheckpoint(cp2)
 	require.NoError(t, err)
-	assert.DeepEqual(t, st2.ToProto(), s.ToProto(), "incorrectly cached state")
+	assert.DeepEqual(t, st2.CloneInnerState(), s.CloneInnerState(), "incorrectly cached state")

 	s, err = cache.StateByCheckpoint(cp1)
 	require.NoError(t, err)
-	assert.DeepEqual(t, st.ToProto(), s.ToProto(), "incorrectly cached state")
+	assert.DeepEqual(t, st.CloneInnerState(), s.CloneInnerState(), "incorrectly cached state")
 }

 func TestCheckpointStateCache_MaxSize(t *testing.T) {
 	c := NewCheckpointStateCache()
-	st, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
+	st, err := v1.InitializeFromProto(&ethpb.BeaconState{
 		Slot: 0,
 	})
 	require.NoError(t, err)

 	for i := uint64(0); i < uint64(maxCheckpointStateSize+100); i++ {
-		require.NoError(t, st.SetSlot(primitives.Slot(i)))
-		require.NoError(t, c.AddCheckpointState(&ethpb.Checkpoint{Epoch: primitives.Epoch(i), Root: make([]byte, 32)}, st))
+		require.NoError(t, st.SetSlot(types.Slot(i)))
+		require.NoError(t, c.AddCheckpointState(&ethpb.Checkpoint{Epoch: types.Epoch(i), Root: make([]byte, 32)}, st))
 	}

 	assert.Equal(t, maxCheckpointStateSize, len(c.cache.Keys()))
--- a/beacon-chain/cache/committee.go
+++ b/beacon-chain/cache/committee.go
@@ -14,7 +14,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	lruwrpr "github.com/prysmaticlabs/prysm/v3/cache/lru"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/container/slice"
 	mathutil "github.com/prysmaticlabs/prysm/v3/math"
 )
@@ -64,7 +64,7 @@ func NewCommitteesCache() *CommitteeCache {

 // Committee fetches the shuffled indices by slot and committee index. Every list of indices
 // represent one committee. Returns true if the list exists with slot and committee index. Otherwise returns false, nil.
-func (c *CommitteeCache) Committee(ctx context.Context, slot primitives.Slot, seed [32]byte, index primitives.CommitteeIndex) ([]primitives.ValidatorIndex, error) {
+func (c *CommitteeCache) Committee(ctx context.Context, slot types.Slot, seed [32]byte, index types.CommitteeIndex) ([]types.ValidatorIndex, error) {
 	if err := c.checkInProgress(ctx, seed); err != nil {
 		return nil, err
 	}
@@ -117,7 +117,7 @@ func (c *CommitteeCache) AddCommitteeShuffledList(ctx context.Context, committee
 }

 // ActiveIndices returns the active indices of a given seed stored in cache.
-func (c *CommitteeCache) ActiveIndices(ctx context.Context, seed [32]byte) ([]primitives.ValidatorIndex, error) {
+func (c *CommitteeCache) ActiveIndices(ctx context.Context, seed [32]byte) ([]types.ValidatorIndex, error) {
 	if err := c.checkInProgress(ctx, seed); err != nil {
 		return nil, err
 	}
--- a/beacon-chain/cache/committee_disabled.go
+++ b/beacon-chain/cache/committee_disabled.go
@@ -6,7 +6,7 @@ package cache
 import (
 	"context"

-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 )

 // FakeCommitteeCache is a struct with 1 queue for looking up shuffled indices list by seed.
@@ -20,7 +20,7 @@ func NewCommitteesCache() *FakeCommitteeCache {

 // Committee fetches the shuffled indices by slot and committee index. Every list of indices
 // represent one committee. Returns true if the list exists with slot and committee index. Otherwise returns false, nil.
-func (c *FakeCommitteeCache) Committee(ctx context.Context, slot primitives.Slot, seed [32]byte, index primitives.CommitteeIndex) ([]primitives.ValidatorIndex, error) {
+func (c *FakeCommitteeCache) Committee(ctx context.Context, slot types.Slot, seed [32]byte, index types.CommitteeIndex) ([]types.ValidatorIndex, error) {
 	return nil, nil
 }

@@ -31,12 +31,12 @@ func (c *FakeCommitteeCache) AddCommitteeShuffledList(ctx context.Context, commi
 }

 // AddProposerIndicesList updates the committee shuffled list with proposer indices.
-func (c *FakeCommitteeCache) AddProposerIndicesList(seed [32]byte, indices []primitives.ValidatorIndex) error {
+func (c *FakeCommitteeCache) AddProposerIndicesList(seed [32]byte, indices []types.ValidatorIndex) error {
 	return nil
 }

 // ActiveIndices returns the active indices of a given seed stored in cache.
-func (c *FakeCommitteeCache) ActiveIndices(ctx context.Context, seed [32]byte) ([]primitives.ValidatorIndex, error) {
+func (c *FakeCommitteeCache) ActiveIndices(ctx context.Context, seed [32]byte) ([]types.ValidatorIndex, error) {
 	return nil, nil
 }

@@ -51,7 +51,7 @@ func (c *FakeCommitteeCache) ActiveBalance(seed [32]byte) (uint64, error) {
 }

 // ProposerIndices returns the proposer indices of a given seed.
-func (c *FakeCommitteeCache) ProposerIndices(seed [32]byte) ([]primitives.ValidatorIndex, error) {
+func (c *FakeCommitteeCache) ProposerIndices(seed [32]byte) ([]types.ValidatorIndex, error) {
 	return nil, nil
 }

--- a/beacon-chain/cache/committee_test.go
+++ b/beacon-chain/cache/committee_test.go
@@ -10,7 +10,7 @@ import (
 	"testing"

 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v3/testing/assert"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
@@ -20,7 +20,7 @@ func TestCommitteeKeyFn_OK(t *testing.T) {
 	item := &Committees{
 		CommitteeCount:  1,
 		Seed:            [32]byte{'A'},
-		ShuffledIndices: []primitives.ValidatorIndex{1, 2, 3, 4, 5},
+		ShuffledIndices: []types.ValidatorIndex{1, 2, 3, 4, 5},
 	}

 	k, err := committeeKeyFn(item)
@@ -37,13 +37,13 @@ func TestCommitteeCache_CommitteesByEpoch(t *testing.T) {
 	cache := NewCommitteesCache()

 	item := &Committees{
-		ShuffledIndices: []primitives.ValidatorIndex{1, 2, 3, 4, 5, 6},
+		ShuffledIndices: []types.ValidatorIndex{1, 2, 3, 4, 5, 6},
 		Seed:            [32]byte{'A'},
 		CommitteeCount:  3,
 	}

 	slot := params.BeaconConfig().SlotsPerEpoch
-	committeeIndex := primitives.CommitteeIndex(1)
+	committeeIndex := types.CommitteeIndex(1)
 	indices, err := cache.Committee(context.Background(), slot, item.Seed, committeeIndex)
 	require.NoError(t, err)
 	if indices != nil {
@@ -51,7 +51,7 @@ func TestCommitteeCache_CommitteesByEpoch(t *testing.T) {
 	}
 	require.NoError(t, cache.AddCommitteeShuffledList(context.Background(), item))

-	wantedIndex := primitives.CommitteeIndex(0)
+	wantedIndex := types.CommitteeIndex(0)
 	indices, err = cache.Committee(context.Background(), slot, item.Seed, wantedIndex)
 	require.NoError(t, err)

@@ -62,7 +62,7 @@ func TestCommitteeCache_CommitteesByEpoch(t *testing.T) {
 func TestCommitteeCache_ActiveIndices(t *testing.T) {
 	cache := NewCommitteesCache()

-	item := &Committees{Seed: [32]byte{'A'}, SortedIndices: []primitives.ValidatorIndex{1, 2, 3, 4, 5, 6}}
+	item := &Committees{Seed: [32]byte{'A'}, SortedIndices: []types.ValidatorIndex{1, 2, 3, 4, 5, 6}}
 	indices, err := cache.ActiveIndices(context.Background(), item.Seed)
 	require.NoError(t, err)
 	if indices != nil {
@@ -79,7 +79,7 @@ func TestCommitteeCache_ActiveIndices(t *testing.T) {
 func TestCommitteeCache_ActiveCount(t *testing.T) {
 	cache := NewCommitteesCache()

-	item := &Committees{Seed: [32]byte{'A'}, SortedIndices: []primitives.ValidatorIndex{1, 2, 3, 4, 5, 6}}
+	item := &Committees{Seed: [32]byte{'A'}, SortedIndices: []types.ValidatorIndex{1, 2, 3, 4, 5, 6}}
 	count, err := cache.ActiveIndicesCount(context.Background(), item.Seed)
 	require.NoError(t, err)
 	assert.Equal(t, 0, count, "Expected active count not to exist in empty cache")
@@ -123,8 +123,8 @@ func TestCommitteeCacheOutOfRange(t *testing.T) {
 	comms := &Committees{
 		CommitteeCount:  1,
 		Seed:            seed,
-		ShuffledIndices: []primitives.ValidatorIndex{0},
-		SortedIndices:   []primitives.ValidatorIndex{},
+		ShuffledIndices: []types.ValidatorIndex{0},
+		SortedIndices:   []types.ValidatorIndex{},
 	}
 	key, err := committeeKeyFn(comms)
 	assert.NoError(t, err)
@@ -137,7 +137,7 @@ func TestCommitteeCacheOutOfRange(t *testing.T) {
 func TestCommitteeCache_DoesNothingWhenCancelledContext(t *testing.T) {
 	cache := NewCommitteesCache()

-	item := &Committees{Seed: [32]byte{'A'}, SortedIndices: []primitives.ValidatorIndex{1, 2, 3, 4, 5, 6}}
+	item := &Committees{Seed: [32]byte{'A'}, SortedIndices: []types.ValidatorIndex{1, 2, 3, 4, 5, 6}}
 	count, err := cache.ActiveIndicesCount(context.Background(), item.Seed)
 	require.NoError(t, err)
 	assert.Equal(t, 0, count, "Expected active count not to exist in empty cache")
--- a/beacon-chain/cache/committees.go
+++ b/beacon-chain/cache/committees.go
@@ -3,7 +3,7 @@ package cache
 import (
 	"errors"

-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 )

 // ErrNotCommittee will be returned when a cache object is not a pointer to
@@ -14,6 +14,6 @@ var ErrNotCommittee = errors.New("object is not a committee struct")
 type Committees struct {
 	CommitteeCount  uint64
 	Seed            [32]byte
-	ShuffledIndices []primitives.ValidatorIndex
-	SortedIndices   []primitives.ValidatorIndex
+	ShuffledIndices []types.ValidatorIndex
+	SortedIndices   []types.ValidatorIndex
 }
--- a/beacon-chain/cache/depositsnapshot/BUILD.bazel
+++ b/beacon-chain/cache/depositsnapshot/BUILD.bazel
@@ -1,21 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library")
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "deposit_tree.go",
-        "deposit_tree_snapshot.go",
-        "merkle_tree.go",
-        "zerohashes.gen.go",
-    ],
-    importpath = "github.com/prysmaticlabs/prysm/v3/beacon-chain/cache/depositsnapshot",
-    visibility = ["//visibility:public"],
-    deps = [
-        "//container/slice:go_default_library",
-        "//crypto/hash:go_default_library",
-        "//encoding/bytesutil:go_default_library",
-        "//math:go_default_library",
-        "//proto/eth/v1:go_default_library",
-        "@com_github_pkg_errors//:go_default_library",
-    ],
-)
--- a/beacon-chain/cache/depositsnapshot/deposit_tree.go
+++ b/beacon-chain/cache/depositsnapshot/deposit_tree.go
@@ -1,157 +0,0 @@
-// Package depositsnapshot implements the EIP-4881 standard for minimal sparse Merkle tree.
-// The format proposed by the EIP allows for the pruning of deposits that are no longer needed to participate fully in consensus.
-// Full EIP-4881 specification can be found here: https://eips.ethereum.org/EIPS/eip-4881
-package depositsnapshot
-
-import (
-	"crypto/sha256"
-
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v3/math"
-	eth "github.com/prysmaticlabs/prysm/v3/proto/eth/v1"
-)
-
-var (
-	// ErrEmptyExecutionBlock occurs when the execution block is nil.
-	ErrEmptyExecutionBlock = errors.New("empty execution block")
-	// ErrInvalidSnapshotRoot occurs when the snapshot root does not match the calculated root.
-	ErrInvalidSnapshotRoot = errors.New("snapshot root is invalid")
-	// ErrInvalidMixInLength occurs when the value for mix in length is 0.
-	ErrInvalidMixInLength = errors.New("mixInLength should be greater than 0")
-	// ErrInvalidIndex occurs when the index is less than the number of finalized deposits.
-	ErrInvalidIndex = errors.New("index should be greater than finalizedDeposits - 1")
-	// ErrNoDeposits occurs when the number of deposits is 0.
-	ErrNoDeposits = errors.New("number of deposits should be greater than 0")
-	// ErrNoFinalizedDeposits occurs when the number of finalized deposits is 0.
-	ErrNoFinalizedDeposits = errors.New("number of finalized deposits should be greater than 0")
-	// ErrTooManyDeposits occurs when the number of deposits exceeds the capacity of the tree.
-	ErrTooManyDeposits = errors.New("number of deposits should not be greater than the capacity of the tree")
-)
-
-// DepositTree is the Merkle tree representation of deposits.
-type DepositTree struct {
-	tree                    MerkleTreeNode
-	mixInLength             uint64 // number of deposits in the tree, reference implementation calls this mix_in_length.
-	finalizedExecutionBlock executionBlock
-}
-
-type executionBlock struct {
-	Hash  [32]byte
-	Depth uint64
-}
-
-// New creates an empty deposit tree.
-//
-//nolint:unused
-func New() *DepositTree {
-	var leaves [][32]byte
-	merkle := create(leaves, DepositContractDepth)
-	return &DepositTree{
-		tree:                    merkle,
-		mixInLength:             0,
-		finalizedExecutionBlock: executionBlock{},
-	}
-}
-
-// getSnapshot returns a deposit tree snapshot.
-//
-//nolint:unused
-func (d *DepositTree) getSnapshot() (DepositTreeSnapshot, error) {
-	if d.finalizedExecutionBlock == (executionBlock{}) {
-		return DepositTreeSnapshot{}, ErrEmptyExecutionBlock
-	}
-	var finalized [][32]byte
-	depositCount, _ := d.tree.GetFinalized(finalized)
-	return fromTreeParts(finalized, depositCount, d.finalizedExecutionBlock)
-}
-
-// fromSnapshot returns a deposit tree from a deposit tree snapshot.
-//
-//nolint:unused
-func fromSnapshot(snapshot DepositTreeSnapshot) (DepositTree, error) {
-	root, err := snapshot.CalculateRoot()
-	if err != nil {
-		return DepositTree{}, err
-	}
-	if snapshot.depositRoot != root {
-		return DepositTree{}, ErrInvalidSnapshotRoot
-	}
-	if snapshot.depositCount >= math.PowerOf2(uint64(DepositContractDepth)) {
-		return DepositTree{}, ErrTooManyDeposits
-	}
-	tree, err := fromSnapshotParts(snapshot.finalized, snapshot.depositCount, DepositContractDepth)
-	if err != nil {
-		return DepositTree{}, err
-	}
-	if snapshot.depositCount == 0 {
-		return DepositTree{}, ErrNoDeposits
-	}
-	return DepositTree{
-		tree:                    tree,
-		mixInLength:             snapshot.depositCount,
-		finalizedExecutionBlock: snapshot.executionBlock,
-	}, nil
-}
-
-// finalize marks a deposit as finalized.
-//
-//nolint:unused
-func (d *DepositTree) finalize(eth1data *eth.Eth1Data, executionBlockHeight uint64) error {
-	var blockHash [32]byte
-	copy(blockHash[:], eth1data.BlockHash)
-	d.finalizedExecutionBlock = executionBlock{
-		Hash:  blockHash,
-		Depth: executionBlockHeight,
-	}
-	_, err := d.tree.Finalize(eth1data.DepositCount, DepositContractDepth)
-	if err != nil {
-		return err
-	}
-	return nil
-}
-
-// getProof returns the Deposit tree proof.
-//
-//nolint:unused
-func (d *DepositTree) getProof(index uint64) ([32]byte, [][32]byte, error) {
-	if d.mixInLength <= 0 {
-		return [32]byte{}, nil, ErrInvalidMixInLength
-	}
-	finalizedDeposits, _ := d.tree.GetFinalized([][32]byte{})
-	if finalizedDeposits == 0 {
-		return [32]byte{}, nil, ErrNoFinalizedDeposits
-	}
-	if finalizedDeposits != 0 {
-		finalizedDeposits = finalizedDeposits - 1
-	}
-	if index <= finalizedDeposits {
-		return [32]byte{}, nil, ErrInvalidIndex
-	}
-	leaf, proof := generateProof(d.tree, index, DepositContractDepth)
-	var mixInLength [32]byte
-	copy(mixInLength[:], bytesutil.Uint64ToBytesLittleEndian32(d.mixInLength))
-	proof = append(proof, mixInLength)
-	return leaf, proof, nil
-}
-
-// getRoot returns the root of the deposit tree.
-//
-//nolint:unused
-func (d *DepositTree) getRoot() [32]byte {
-	root := d.tree.GetRoot()
-	return sha256.Sum256(append(root[:], bytesutil.Uint64ToBytesLittleEndian32(d.mixInLength)...))
-}
-
-// pushLeaf adds a new leaf to the tree.
-//
-//nolint:unused
-func (d *DepositTree) pushLeaf(leaf [32]byte) error {
-	var err error
-	d.tree, err = d.tree.PushLeaf(leaf, DepositContractDepth)
-	if err != nil {
-		return err
-	}
-	d.mixInLength++
-	return nil
-}
--- a/beacon-chain/cache/depositsnapshot/deposit_tree_snapshot.go
+++ b/beacon-chain/cache/depositsnapshot/deposit_tree_snapshot.go
@@ -1,62 +0,0 @@
-package depositsnapshot
-
-import (
-	"crypto/sha256"
-
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
-)
-
-var (
-	// ErrZeroIndex occurs when the value of index is 0.
-	ErrZeroIndex = errors.New("index should be greater than 0")
-)
-
-// DepositTreeSnapshot represents the data used to create a
-// deposit tree given a snapshot.
-//
-//nolint:unused
-type DepositTreeSnapshot struct {
-	finalized      [][32]byte
-	depositRoot    [32]byte
-	depositCount   uint64
-	executionBlock executionBlock
-}
-
-// CalculateRoot returns the root of a deposit tree snapshot.
-func (ds *DepositTreeSnapshot) CalculateRoot() ([32]byte, error) {
-	size := ds.depositCount
-	index := len(ds.finalized)
-	root := Zerohashes[0]
-	for i := 0; i < DepositContractDepth; i++ {
-		if (size & 1) == 1 {
-			if index == 0 {
-				return [32]byte{}, ErrZeroIndex
-			}
-			index--
-			root = sha256.Sum256(append(ds.finalized[index][:], root[:]...))
-		} else {
-			root = sha256.Sum256(append(root[:], Zerohashes[i][:]...))
-		}
-		size >>= 1
-	}
-	return sha256.Sum256(append(root[:], bytesutil.Uint64ToBytesLittleEndian(ds.depositCount)...)), nil
-}
-
-// fromTreeParts constructs the deposit tree from pre-existing data.
-//
-//nolint:unused
-func fromTreeParts(finalised [][32]byte, depositCount uint64, executionBlock executionBlock) (DepositTreeSnapshot, error) {
-	snapshot := DepositTreeSnapshot{
-		finalized:      finalised,
-		depositRoot:    Zerohashes[0],
-		depositCount:   depositCount,
-		executionBlock: executionBlock,
-	}
-	root, err := snapshot.CalculateRoot()
-	if err != nil {
-		return snapshot, ErrInvalidSnapshotRoot
-	}
-	snapshot.depositRoot = root
-	return snapshot, nil
-}
--- a/beacon-chain/cache/depositsnapshot/merkle_tree.go
+++ b/beacon-chain/cache/depositsnapshot/merkle_tree.go
@@ -1,324 +0,0 @@
-package depositsnapshot
-
-import (
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v3/container/slice"
-	"github.com/prysmaticlabs/prysm/v3/crypto/hash"
-	"github.com/prysmaticlabs/prysm/v3/math"
-)
-
-const (
-	// DepositContractDepth is the maximum tree depth as defined by EIP-4881.
-	DepositContractDepth = 32
-)
-
-var (
-	// ErrFinalizedNodeCannotPushLeaf may occur when attempting to push a leaf to a finalized node. When a node is finalized, it cannot be modified or changed.
-	ErrFinalizedNodeCannotPushLeaf = errors.New("can't push a leaf to a finalized node")
-	// ErrLeafNodeCannotPushLeaf may occur when attempting to push a leaf to a leaf node.
-	ErrLeafNodeCannotPushLeaf = errors.New("can't push a leaf to a leaf node")
-	// ErrZeroLevel occurs when the value of level is 0.
-	ErrZeroLevel = errors.New("level should be greater than 0")
-	// ErrZeroDepth occurs when the value of depth is 0.
-	ErrZeroDepth = errors.New("depth should be greater than 0")
-)
-
-// 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(depositsToFinalize uint64, depth uint64) (MerkleTreeNode, error)
-	// GetFinalized returns the number of deposits and a list of hashes of all the finalized nodes.
-	GetFinalized(result [][32]byte) (uint64, [][32]byte)
-	// PushLeaf adds a new leaf node at the next available Zero node.
-	PushLeaf(leaf [32]byte, depth uint64) (MerkleTreeNode, error)
-
-	// Right represents the right child of a node.
-	Right() MerkleTreeNode
-	// Left represents the left child of a node.
-	Left() MerkleTreeNode
-}
-
-// create builds a new merkle tree
-func create(leaves [][32]byte, depth uint64) MerkleTreeNode {
-	length := uint64(len(leaves))
-	if length == 0 {
-		return &ZeroNode{depth: depth}
-	}
-	if depth == 0 {
-		return &LeafNode{hash: leaves[0]}
-	}
-	split := math.Min(math.PowerOf2(depth-1), length)
-	left := create(leaves[0:split], depth-1)
-	right := create(leaves[split:], depth-1)
-	return &InnerNode{left: left, right: right}
-}
-
-// fromSnapshotParts creates a new Merkle tree from a list of finalized leaves, number of deposits and specified depth.
-//
-//nolint:unused
-func fromSnapshotParts(finalized [][32]byte, deposits uint64, level uint64) (_ MerkleTreeNode, err error) {
-	if len(finalized) < 1 || deposits == 0 {
-		return &ZeroNode{
-			depth: level,
-		}, nil
-	}
-	if deposits == math.PowerOf2(level) {
-		return &FinalizedNode{
-			depositCount: deposits,
-			hash:         finalized[0],
-		}, nil
-	}
-	if level == 0 {
-		return &ZeroNode{}, ErrZeroLevel
-	}
-	node := InnerNode{}
-	if leftSubtree := math.PowerOf2(level - 1); deposits <= leftSubtree {
-		node.left, err = fromSnapshotParts(finalized, deposits, level-1)
-		if err != nil {
-			return &ZeroNode{}, err
-		}
-		node.right = &ZeroNode{depth: level - 1}
-	} else {
-		node.left = &FinalizedNode{
-			depositCount: leftSubtree,
-			hash:         finalized[0],
-		}
-		node.right, err = fromSnapshotParts(finalized[1:], deposits-leftSubtree, level-1)
-		if err != nil {
-			return &ZeroNode{}, err
-		}
-	}
-	return &node, nil
-}
-
-// generateProof returns a merkle proof and root
-//
-//nolint:unused
-func generateProof(tree MerkleTreeNode, index uint64, depth uint64) ([32]byte, [][32]byte) {
-	var proof [][32]byte
-	node := tree
-	for depth > 0 {
-		ithBit := (index >> (depth - 1)) & 0x1
-		if ithBit == 1 {
-			proof = append(proof, node.Left().GetRoot())
-			node = node.Right()
-		} else {
-			proof = append(proof, node.Right().GetRoot())
-			node = node.Left()
-		}
-		depth--
-	}
-	proof = slice.Reverse(proof)
-	return node.GetRoot(), proof
-}
-
-// FinalizedNode represents a finalized node and satisfies the MerkleTreeNode interface.
-type FinalizedNode struct {
-	depositCount uint64
-	hash         [32]byte
-}
-
-// GetRoot returns the root of the Merkle tree.
-func (f *FinalizedNode) GetRoot() [32]byte {
-	return f.hash
-}
-
-// IsFull returns whether there is space left for deposits.
-// A FinalizedNode will always return true as by definition it
-// is full and deposits can't be added to it.
-func (_ *FinalizedNode) IsFull() bool {
-	return true
-}
-
-// Finalize marks deposits of the Merkle tree as finalized.
-func (f *FinalizedNode) Finalize(depositsToFinalize uint64, depth uint64) (MerkleTreeNode, error) {
-	return f, nil
-}
-
-// GetFinalized returns a list of hashes of all the finalized nodes and the number of deposits.
-func (f *FinalizedNode) GetFinalized(result [][32]byte) (uint64, [][32]byte) {
-	return f.depositCount, append(result, f.hash)
-}
-
-// PushLeaf adds a new leaf node at the next available zero node.
-func (_ *FinalizedNode) PushLeaf(_ [32]byte, _ uint64) (MerkleTreeNode, error) {
-	return nil, ErrFinalizedNodeCannotPushLeaf
-}
-
-// Right returns nil as a finalized node can't have any children.
-func (_ *FinalizedNode) Right() MerkleTreeNode {
-	return nil
-}
-
-// Left returns nil as a finalized node can't have any children.
-func (_ *FinalizedNode) Left() MerkleTreeNode {
-	return nil
-}
-
-// LeafNode represents a leaf node holding a deposit and satisfies the MerkleTreeNode interface.
-type LeafNode struct {
-	hash [32]byte
-}
-
-// GetRoot returns the root of the Merkle tree.
-func (l *LeafNode) GetRoot() [32]byte {
-	return l.hash
-}
-
-// IsFull returns whether there is space left for deposits.
-// A LeafNode will always return true as it is the last node
-// in the tree and therefore can't have any deposits added to it.
-func (_ *LeafNode) IsFull() bool {
-	return true
-}
-
-// Finalize marks deposits of the Merkle tree as finalized.
-func (l *LeafNode) Finalize(depositsToFinalize uint64, depth uint64) (MerkleTreeNode, error) {
-	return &FinalizedNode{1, l.hash}, nil
-}
-
-// GetFinalized returns a list of hashes of all the finalized nodes and the number of deposits.
-func (_ *LeafNode) GetFinalized(result [][32]byte) (uint64, [][32]byte) {
-	return 0, result
-}
-
-// PushLeaf adds a new leaf node at the next available zero node.
-func (_ *LeafNode) PushLeaf(_ [32]byte, _ uint64) (MerkleTreeNode, error) {
-	return nil, ErrLeafNodeCannotPushLeaf
-}
-
-// Right returns nil as a leaf node is the last node and can't have any children.
-func (_ *LeafNode) Right() MerkleTreeNode {
-	return nil
-}
-
-// Left returns nil as a leaf node is the last node and can't have any children.
-func (_ *LeafNode) Left() MerkleTreeNode {
-	return nil
-}
-
-// InnerNode represents an inner node with two children and satisfies the MerkleTreeNode interface.
-type InnerNode struct {
-	left, right MerkleTreeNode
-}
-
-// GetRoot returns the root of the Merkle tree.
-func (n *InnerNode) GetRoot() [32]byte {
-	left := n.left.GetRoot()
-	right := n.right.GetRoot()
-	return hash.Hash(append(left[:], right[:]...))
-}
-
-// IsFull returns whether there is space left for deposits.
-func (n *InnerNode) IsFull() bool {
-	return n.right.IsFull()
-}
-
-// Finalize marks deposits of the Merkle tree as finalized.
-func (n *InnerNode) Finalize(depositsToFinalize uint64, depth uint64) (_ MerkleTreeNode, err error) {
-	deposits := math.PowerOf2(depth)
-	if deposits <= depositsToFinalize {
-		return &FinalizedNode{deposits, n.GetRoot()}, nil
-	}
-	if depth == 0 {
-		return &ZeroNode{}, ErrZeroDepth
-	}
-	n.left, err = n.left.Finalize(depositsToFinalize, depth-1)
-	if err != nil {
-		return &ZeroNode{}, err
-	}
-	if depositsToFinalize > deposits/2 {
-		remaining := depositsToFinalize - deposits/2
-		n.right, err = n.right.Finalize(remaining, depth-1)
-		if err != nil {
-			return &ZeroNode{}, err
-		}
-	}
-	return n, nil
-}
-
-// GetFinalized returns a list of hashes of all the finalized nodes and the number of deposits.
-func (n *InnerNode) GetFinalized(result [][32]byte) (uint64, [][32]byte) {
-	leftDeposits, result := n.left.GetFinalized(result)
-	rightDeposits, result := n.right.GetFinalized(result)
-	return leftDeposits + rightDeposits, result
-}
-
-// PushLeaf adds a new leaf node at the next available zero node.
-func (n *InnerNode) PushLeaf(leaf [32]byte, depth uint64) (MerkleTreeNode, error) {
-	if !n.left.IsFull() {
-		left, err := n.left.PushLeaf(leaf, depth-1)
-		if err == nil {
-			n.left = left
-		} else {
-			return n, err
-		}
-	} else {
-		right, err := n.right.PushLeaf(leaf, depth-1)
-		if err == nil {
-			n.right = right
-		} else {
-			return n, err
-		}
-	}
-	return n, nil
-}
-
-// Right returns the child node on the right.
-func (n *InnerNode) Right() MerkleTreeNode {
-	return n.right
-}
-
-// Left returns the child node on the left.
-func (n *InnerNode) Left() MerkleTreeNode {
-	return n.left
-}
-
-// ZeroNode represents an empty node without a deposit and satisfies the MerkleTreeNode interface.
-type ZeroNode struct {
-	depth uint64
-}
-
-// GetRoot returns the root of the Merkle tree.
-func (z *ZeroNode) GetRoot() [32]byte {
-	if z.depth == DepositContractDepth {
-		return hash.Hash(append(Zerohashes[z.depth-1][:], Zerohashes[z.depth-1][:]...))
-	}
-	return Zerohashes[z.depth]
-}
-
-// IsFull returns wh   ether there is space left for deposits.
-// A ZeroNode will always return false as a ZeroNode is an empty node
-// that gets replaced by a deposit.
-func (_ *ZeroNode) IsFull() bool {
-	return false
-}
-
-// Finalize marks deposits of the Merkle tree as finalized.
-func (_ *ZeroNode) Finalize(depositsToFinalize uint64, depth uint64) (MerkleTreeNode, error) {
-	return nil, nil
-}
-
-// GetFinalized returns a list of hashes of all the finalized nodes and the number of deposits.
-func (_ *ZeroNode) GetFinalized(result [][32]byte) (uint64, [][32]byte) {
-	return 0, result
-}
-
-// PushLeaf adds a new leaf node at the next available zero node.
-func (_ *ZeroNode) PushLeaf(leaf [32]byte, depth uint64) (MerkleTreeNode, error) {
-	return create([][32]byte{leaf}, depth), nil
-}
-
-// Right returns nil as a zero node can't have any children.
-func (_ *ZeroNode) Right() MerkleTreeNode {
-	return nil
-}
-
-// Left returns nil as a zero node can't have any children.
-func (_ *ZeroNode) Left() MerkleTreeNode {
-	return nil
-}
--- a/beacon-chain/cache/depositsnapshot/zerohashes.gen.go
+++ b/beacon-chain/cache/depositsnapshot/zerohashes.gen.go
@@ -1,69 +0,0 @@
-// Code generated by gen_zerohashes. DO NOT EDIT.
-package depositsnapshot
-
-var Zerohashes = [][32]byte{
-	// 0000000000000000000000000000000000000000000000000000000000000000
-	{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0},
-	// f5a5fd42d16a20302798ef6ed309979b43003d2320d9f0e8ea9831a92759fb4b
-	{245, 165, 253, 66, 209, 106, 32, 48, 39, 152, 239, 110, 211, 9, 151, 155, 67, 0, 61, 35, 32, 217, 240, 232, 234, 152, 49, 169, 39, 89, 251, 75},
-	// db56114e00fdd4c1f85c892bf35ac9a89289aaecb1ebd0a96cde606a748b5d71
-	{219, 86, 17, 78, 0, 253, 212, 193, 248, 92, 137, 43, 243, 90, 201, 168, 146, 137, 170, 236, 177, 235, 208, 169, 108, 222, 96, 106, 116, 139, 93, 113},
-	// c78009fdf07fc56a11f122370658a353aaa542ed63e44c4bc15ff4cd105ab33c
-	{199, 128, 9, 253, 240, 127, 197, 106, 17, 241, 34, 55, 6, 88, 163, 83, 170, 165, 66, 237, 99, 228, 76, 75, 193, 95, 244, 205, 16, 90, 179, 60},
-	// 536d98837f2dd165a55d5eeae91485954472d56f246df256bf3cae19352a123c
-	{83, 109, 152, 131, 127, 45, 209, 101, 165, 93, 94, 234, 233, 20, 133, 149, 68, 114, 213, 111, 36, 109, 242, 86, 191, 60, 174, 25, 53, 42, 18, 60},
-	// 9efde052aa15429fae05bad4d0b1d7c64da64d03d7a1854a588c2cb8430c0d30
-	{158, 253, 224, 82, 170, 21, 66, 159, 174, 5, 186, 212, 208, 177, 215, 198, 77, 166, 77, 3, 215, 161, 133, 74, 88, 140, 44, 184, 67, 12, 13, 48},
-	// d88ddfeed400a8755596b21942c1497e114c302e6118290f91e6772976041fa1
-	{216, 141, 223, 238, 212, 0, 168, 117, 85, 150, 178, 25, 66, 193, 73, 126, 17, 76, 48, 46, 97, 24, 41, 15, 145, 230, 119, 41, 118, 4, 31, 161},
-	// 87eb0ddba57e35f6d286673802a4af5975e22506c7cf4c64bb6be5ee11527f2c
-	{135, 235, 13, 219, 165, 126, 53, 246, 210, 134, 103, 56, 2, 164, 175, 89, 117, 226, 37, 6, 199, 207, 76, 100, 187, 107, 229, 238, 17, 82, 127, 44},
-	// 26846476fd5fc54a5d43385167c95144f2643f533cc85bb9d16b782f8d7db193
-	{38, 132, 100, 118, 253, 95, 197, 74, 93, 67, 56, 81, 103, 201, 81, 68, 242, 100, 63, 83, 60, 200, 91, 185, 209, 107, 120, 47, 141, 125, 177, 147},
-	// 506d86582d252405b840018792cad2bf1259f1ef5aa5f887e13cb2f0094f51e1
-	{80, 109, 134, 88, 45, 37, 36, 5, 184, 64, 1, 135, 146, 202, 210, 191, 18, 89, 241, 239, 90, 165, 248, 135, 225, 60, 178, 240, 9, 79, 81, 225},
-	// ffff0ad7e659772f9534c195c815efc4014ef1e1daed4404c06385d11192e92b
-	{255, 255, 10, 215, 230, 89, 119, 47, 149, 52, 193, 149, 200, 21, 239, 196, 1, 78, 241, 225, 218, 237, 68, 4, 192, 99, 133, 209, 17, 146, 233, 43},
-	// 6cf04127db05441cd833107a52be852868890e4317e6a02ab47683aa75964220
-	{108, 240, 65, 39, 219, 5, 68, 28, 216, 51, 16, 122, 82, 190, 133, 40, 104, 137, 14, 67, 23, 230, 160, 42, 180, 118, 131, 170, 117, 150, 66, 32},
-	// b7d05f875f140027ef5118a2247bbb84ce8f2f0f1123623085daf7960c329f5f
-	{183, 208, 95, 135, 95, 20, 0, 39, 239, 81, 24, 162, 36, 123, 187, 132, 206, 143, 47, 15, 17, 35, 98, 48, 133, 218, 247, 150, 12, 50, 159, 95},
-	// df6af5f5bbdb6be9ef8aa618e4bf8073960867171e29676f8b284dea6a08a85e
-	{223, 106, 245, 245, 187, 219, 107, 233, 239, 138, 166, 24, 228, 191, 128, 115, 150, 8, 103, 23, 30, 41, 103, 111, 139, 40, 77, 234, 106, 8, 168, 94},
-	// b58d900f5e182e3c50ef74969ea16c7726c549757cc23523c369587da7293784
-	{181, 141, 144, 15, 94, 24, 46, 60, 80, 239, 116, 150, 158, 161, 108, 119, 38, 197, 73, 117, 124, 194, 53, 35, 195, 105, 88, 125, 167, 41, 55, 132},
-	// d49a7502ffcfb0340b1d7885688500ca308161a7f96b62df9d083b71fcc8f2bb
-	{212, 154, 117, 2, 255, 207, 176, 52, 11, 29, 120, 133, 104, 133, 0, 202, 48, 129, 97, 167, 249, 107, 98, 223, 157, 8, 59, 113, 252, 200, 242, 187},
-	// 8fe6b1689256c0d385f42f5bbe2027a22c1996e110ba97c171d3e5948de92beb
-	{143, 230, 177, 104, 146, 86, 192, 211, 133, 244, 47, 91, 190, 32, 39, 162, 44, 25, 150, 225, 16, 186, 151, 193, 113, 211, 229, 148, 141, 233, 43, 235},
-	// 8d0d63c39ebade8509e0ae3c9c3876fb5fa112be18f905ecacfecb92057603ab
-	{141, 13, 99, 195, 158, 186, 222, 133, 9, 224, 174, 60, 156, 56, 118, 251, 95, 161, 18, 190, 24, 249, 5, 236, 172, 254, 203, 146, 5, 118, 3, 171},
-	// 95eec8b2e541cad4e91de38385f2e046619f54496c2382cb6cacd5b98c26f5a4
-	{149, 238, 200, 178, 229, 65, 202, 212, 233, 29, 227, 131, 133, 242, 224, 70, 97, 159, 84, 73, 108, 35, 130, 203, 108, 172, 213, 185, 140, 38, 245, 164},
-	// f893e908917775b62bff23294dbbe3a1cd8e6cc1c35b4801887b646a6f81f17f
-	{248, 147, 233, 8, 145, 119, 117, 182, 43, 255, 35, 41, 77, 187, 227, 161, 205, 142, 108, 193, 195, 91, 72, 1, 136, 123, 100, 106, 111, 129, 241, 127},
-	// cddba7b592e3133393c16194fac7431abf2f5485ed711db282183c819e08ebaa
-	{205, 219, 167, 181, 146, 227, 19, 51, 147, 193, 97, 148, 250, 199, 67, 26, 191, 47, 84, 133, 237, 113, 29, 178, 130, 24, 60, 129, 158, 8, 235, 170},
-	// 8a8d7fe3af8caa085a7639a832001457dfb9128a8061142ad0335629ff23ff9c
-	{138, 141, 127, 227, 175, 140, 170, 8, 90, 118, 57, 168, 50, 0, 20, 87, 223, 185, 18, 138, 128, 97, 20, 42, 208, 51, 86, 41, 255, 35, 255, 156},
-	// feb3c337d7a51a6fbf00b9e34c52e1c9195c969bd4e7a0bfd51d5c5bed9c1167
-	{254, 179, 195, 55, 215, 165, 26, 111, 191, 0, 185, 227, 76, 82, 225, 201, 25, 92, 150, 155, 212, 231, 160, 191, 213, 29, 92, 91, 237, 156, 17, 103},
-	// e71f0aa83cc32edfbefa9f4d3e0174ca85182eec9f3a09f6a6c0df6377a510d7
-	{231, 31, 10, 168, 60, 195, 46, 223, 190, 250, 159, 77, 62, 1, 116, 202, 133, 24, 46, 236, 159, 58, 9, 246, 166, 192, 223, 99, 119, 165, 16, 215},
-	// 31206fa80a50bb6abe29085058f16212212a60eec8f049fecb92d8c8e0a84bc0
-	{49, 32, 111, 168, 10, 80, 187, 106, 190, 41, 8, 80, 88, 241, 98, 18, 33, 42, 96, 238, 200, 240, 73, 254, 203, 146, 216, 200, 224, 168, 75, 192},
-	// 21352bfecbeddde993839f614c3dac0a3ee37543f9b412b16199dc158e23b544
-	{33, 53, 43, 254, 203, 237, 221, 233, 147, 131, 159, 97, 76, 61, 172, 10, 62, 227, 117, 67, 249, 180, 18, 177, 97, 153, 220, 21, 142, 35, 181, 68},
-	// 619e312724bb6d7c3153ed9de791d764a366b389af13c58bf8a8d90481a46765
-	{97, 158, 49, 39, 36, 187, 109, 124, 49, 83, 237, 157, 231, 145, 215, 100, 163, 102, 179, 137, 175, 19, 197, 139, 248, 168, 217, 4, 129, 164, 103, 101},
-	// 7cdd2986268250628d0c10e385c58c6191e6fbe05191bcc04f133f2cea72c1c4
-	{124, 221, 41, 134, 38, 130, 80, 98, 141, 12, 16, 227, 133, 197, 140, 97, 145, 230, 251, 224, 81, 145, 188, 192, 79, 19, 63, 44, 234, 114, 193, 196},
-	// 848930bd7ba8cac54661072113fb278869e07bb8587f91392933374d017bcbe1
-	{132, 137, 48, 189, 123, 168, 202, 197, 70, 97, 7, 33, 19, 251, 39, 136, 105, 224, 123, 184, 88, 127, 145, 57, 41, 51, 55, 77, 1, 123, 203, 225},
-	// 8869ff2c22b28cc10510d9853292803328be4fb0e80495e8bb8d271f5b889636
-	{136, 105, 255, 44, 34, 178, 140, 193, 5, 16, 217, 133, 50, 146, 128, 51, 40, 190, 79, 176, 232, 4, 149, 232, 187, 141, 39, 31, 91, 136, 150, 54},
-	// b5fe28e79f1b850f8658246ce9b6a1e7b49fc06db7143e8fe0b4f2b0c5523a5c
-	{181, 254, 40, 231, 159, 27, 133, 15, 134, 88, 36, 108, 233, 182, 161, 231, 180, 159, 192, 109, 183, 20, 62, 143, 224, 180, 242, 176, 197, 82, 58, 92},
-	// 985e929f70af28d0bdd1a90a808f977f597c7c778c489e98d3bd8910d31ac0f7
-	{152, 94, 146, 159, 112, 175, 40, 208, 189, 209, 169, 10, 128, 143, 151, 127, 89, 124, 124, 119, 140, 72, 158, 152, 211, 189, 137, 16, 211, 26, 192, 247},
-}
--- a/beacon-chain/cache/payload_id.go
+++ b/beacon-chain/cache/payload_id.go
@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"sync"

-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 )

@@ -27,7 +27,7 @@ func NewProposerPayloadIDsCache() *ProposerPayloadIDsCache {
 }

 // GetProposerPayloadIDs returns the proposer and  payload IDs for the given slot.
-func (f *ProposerPayloadIDsCache) GetProposerPayloadIDs(slot primitives.Slot, r [32]byte) (primitives.ValidatorIndex, [8]byte, bool) {
+func (f *ProposerPayloadIDsCache) GetProposerPayloadIDs(slot types.Slot, r [32]byte) (types.ValidatorIndex, [8]byte, bool) {
 	f.RLock()
 	defer f.RUnlock()
 	ids, ok := f.slotToProposerAndPayloadIDs[idKey(slot, r)]
@@ -40,11 +40,11 @@ func (f *ProposerPayloadIDsCache) GetProposerPayloadIDs(slot primitives.Slot, r
 	var pId [pIdLength]byte
 	copy(pId[:], b)

-	return primitives.ValidatorIndex(bytesutil.BytesToUint64BigEndian(vId)), pId, true
+	return types.ValidatorIndex(bytesutil.BytesToUint64BigEndian(vId)), pId, true
 }

 // SetProposerAndPayloadIDs sets the proposer and payload IDs for the given slot.
-func (f *ProposerPayloadIDsCache) SetProposerAndPayloadIDs(slot primitives.Slot, vId primitives.ValidatorIndex, pId [8]byte, r [32]byte) {
+func (f *ProposerPayloadIDsCache) SetProposerAndPayloadIDs(slot types.Slot, vId types.ValidatorIndex, pId [8]byte, r [32]byte) {
 	f.Lock()
 	defer f.Unlock()
 	var vIdBytes [vIdLength]byte
@@ -57,26 +57,26 @@ func (f *ProposerPayloadIDsCache) SetProposerAndPayloadIDs(slot primitives.Slot,
 	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.
-	var byte8 [vIdLength]byte
+	byte8 := [vIdLength]byte{}
 	if !ok || (ok && bytes.Equal(ids[vIdLength:], byte8[:])) {
 		f.slotToProposerAndPayloadIDs[k] = bs
 	}
 }

 // PrunePayloadIDs removes the payload id entries that's current than input slot.
-func (f *ProposerPayloadIDsCache) PrunePayloadIDs(slot primitives.Slot) {
+func (f *ProposerPayloadIDsCache) PrunePayloadIDs(slot types.Slot) {
 	f.Lock()
 	defer f.Unlock()

 	for k := range f.slotToProposerAndPayloadIDs {
-		s := primitives.Slot(bytesutil.BytesToUint64BigEndian(k[:8]))
+		s := types.Slot(bytesutil.BytesToUint64BigEndian(k[:8]))
 		if slot > s {
 			delete(f.slotToProposerAndPayloadIDs, k)
 		}
 	}
 }

-func idKey(slot primitives.Slot, r [32]byte) [40]byte {
+func idKey(slot types.Slot, r [32]byte) [40]byte {
 	var k [40]byte
 	copy(k[:], append(bytesutil.Uint64ToBytesBigEndian(uint64(slot)), r[:]...))
 	return k
--- a/beacon-chain/cache/payload_id_test.go
+++ b/beacon-chain/cache/payload_id_test.go
@@ -3,20 +3,20 @@ package cache
 import (
 	"testing"

-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 )

 func TestValidatorPayloadIDsCache_GetAndSaveValidatorPayloadIDs(t *testing.T) {
 	cache := NewProposerPayloadIDsCache()
-	var r [32]byte
+	r := [32]byte{}
 	i, p, ok := cache.GetProposerPayloadIDs(0, r)
 	require.Equal(t, false, ok)
-	require.Equal(t, primitives.ValidatorIndex(0), i)
+	require.Equal(t, types.ValidatorIndex(0), i)
 	require.Equal(t, [pIdLength]byte{}, p)

-	slot := primitives.Slot(1234)
-	vid := primitives.ValidatorIndex(34234324)
+	slot := types.Slot(1234)
+	vid := types.ValidatorIndex(34234324)
 	pid := [8]byte{1, 2, 3, 3, 7, 8, 7, 8}
 	r = [32]byte{1, 2, 3}
 	cache.SetProposerAndPayloadIDs(slot, vid, pid, r)
@@ -25,8 +25,8 @@ func TestValidatorPayloadIDsCache_GetAndSaveValidatorPayloadIDs(t *testing.T) {
 	require.Equal(t, vid, i)
 	require.Equal(t, pid, p)

-	slot = primitives.Slot(9456456)
-	vid = primitives.ValidatorIndex(6786745)
+	slot = types.Slot(9456456)
+	vid = types.ValidatorIndex(6786745)
 	r = [32]byte{4, 5, 6}
 	cache.SetProposerAndPayloadIDs(slot, vid, [pIdLength]byte{}, r)
 	i, p, ok = cache.GetProposerPayloadIDs(slot, r)
@@ -35,8 +35,8 @@ func TestValidatorPayloadIDsCache_GetAndSaveValidatorPayloadIDs(t *testing.T) {
 	require.Equal(t, [pIdLength]byte{}, p)

 	// reset cache without pid
-	slot = primitives.Slot(9456456)
-	vid = primitives.ValidatorIndex(11111)
+	slot = types.Slot(9456456)
+	vid = types.ValidatorIndex(11111)
 	r = [32]byte{7, 8, 9}
 	pid = [8]byte{3, 2, 3, 33, 72, 8, 7, 8}
 	cache.SetProposerAndPayloadIDs(slot, vid, pid, r)
@@ -49,12 +49,12 @@ func TestValidatorPayloadIDsCache_GetAndSaveValidatorPayloadIDs(t *testing.T) {
 	r = [32]byte{1, 2, 3}
 	i, p, ok = cache.GetProposerPayloadIDs(slot, r)
 	require.Equal(t, false, ok)
-	require.Equal(t, primitives.ValidatorIndex(0), i)
+	require.Equal(t, types.ValidatorIndex(0), i)
 	require.Equal(t, [pIdLength]byte{}, p)

 	// existing pid - no change in cache
-	slot = primitives.Slot(9456456)
-	vid = primitives.ValidatorIndex(11111)
+	slot = types.Slot(9456456)
+	vid = types.ValidatorIndex(11111)
 	r = [32]byte{7, 8, 9}
 	newPid := [8]byte{1, 2, 3, 33, 72, 8, 7, 1}
 	cache.SetProposerAndPayloadIDs(slot, vid, newPid, r)
@@ -67,6 +67,6 @@ func TestValidatorPayloadIDsCache_GetAndSaveValidatorPayloadIDs(t *testing.T) {
 	cache.PrunePayloadIDs(slot + 1)
 	i, p, ok = cache.GetProposerPayloadIDs(slot, r)
 	require.Equal(t, false, ok)
-	require.Equal(t, primitives.ValidatorIndex(0), i)
+	require.Equal(t, types.ValidatorIndex(0), i)
 	require.Equal(t, [pIdLength]byte{}, p)
 }
--- a/beacon-chain/cache/proposer_indices.go
+++ b/beacon-chain/cache/proposer_indices.go
@@ -7,7 +7,7 @@ import (

 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"k8s.io/client-go/tools/cache"
 )

@@ -76,7 +76,7 @@ func (c *ProposerIndicesCache) HasProposerIndices(r [32]byte) (bool, error) {
 }

 // ProposerIndices returns the proposer indices of a block root seed.
-func (c *ProposerIndicesCache) ProposerIndices(r [32]byte) ([]primitives.ValidatorIndex, error) {
+func (c *ProposerIndicesCache) ProposerIndices(r [32]byte) ([]types.ValidatorIndex, error) {
 	c.lock.RLock()
 	defer c.lock.RUnlock()
 	obj, exists, err := c.proposerIndicesCache.GetByKey(key(r))
--- a/beacon-chain/cache/proposer_indices_disabled.go
+++ b/beacon-chain/cache/proposer_indices_disabled.go
@@ -3,7 +3,7 @@
 // This file is used in fuzzer builds to bypass proposer indices caches.
 package cache

-import "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+import types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"

 // FakeProposerIndicesCache is a struct with 1 queue for looking up proposer indices by root.
 type FakeProposerIndicesCache struct {
@@ -21,7 +21,7 @@ func (c *FakeProposerIndicesCache) AddProposerIndices(p *ProposerIndices) error
 }

 // ProposerIndices returns the proposer indices of a block root seed.
-func (c *FakeProposerIndicesCache) ProposerIndices(r [32]byte) ([]primitives.ValidatorIndex, error) {
+func (c *FakeProposerIndicesCache) ProposerIndices(r [32]byte) ([]types.ValidatorIndex, error) {
 	return nil, nil
 }

--- a/beacon-chain/cache/proposer_indices_test.go
+++ b/beacon-chain/cache/proposer_indices_test.go
@@ -6,7 +6,7 @@ import (
 	"strconv"
 	"testing"

-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v3/testing/assert"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
@@ -15,7 +15,7 @@ import (
 func TestProposerKeyFn_OK(t *testing.T) {
 	item := &ProposerIndices{
 		BlockRoot:       [32]byte{'A'},
-		ProposerIndices: []primitives.ValidatorIndex{1, 2, 3, 4, 5},
+		ProposerIndices: []types.ValidatorIndex{1, 2, 3, 4, 5},
 	}

 	k, err := proposerIndicesKeyFn(item)
@@ -51,7 +51,7 @@ func TestProposerCache_AddProposerIndicesList(t *testing.T) {
 	require.NoError(t, err)
 	assert.Equal(t, true, has)

-	item := &ProposerIndices{BlockRoot: [32]byte{'B'}, ProposerIndices: []primitives.ValidatorIndex{1, 2, 3, 4, 5, 6}}
+	item := &ProposerIndices{BlockRoot: [32]byte{'B'}, ProposerIndices: []types.ValidatorIndex{1, 2, 3, 4, 5, 6}}
 	require.NoError(t, cache.AddProposerIndices(item))

 	received, err = cache.ProposerIndices(item.BlockRoot)
--- a/beacon-chain/cache/proposer_indices_type.go
+++ b/beacon-chain/cache/proposer_indices_type.go
@@ -3,7 +3,7 @@ package cache
 import (
 	"errors"

-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 )

 // ErrNotProposerIndices will be returned when a cache object is not a pointer to
@@ -13,5 +13,5 @@ var ErrNotProposerIndices = errors.New("object is not a proposer indices struct"
 // ProposerIndices defines the cached struct for proposer indices.
 type ProposerIndices struct {
 	BlockRoot       [32]byte
-	ProposerIndices []primitives.ValidatorIndex
+	ProposerIndices []types.ValidatorIndex
 }
--- a/beacon-chain/cache/skip_slot_cache_test.go
+++ b/beacon-chain/cache/skip_slot_cache_test.go
@@ -6,7 +6,7 @@ import (

 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
-	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
+	v1 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/assert"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
@@ -23,7 +23,7 @@ func TestSkipSlotCache_RoundTrip(t *testing.T) {

 	require.NoError(t, c.MarkInProgress(r))

-	s, err = state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
+	s, err = v1.InitializeFromProto(&ethpb.BeaconState{
 		Slot: 10,
 	})
 	require.NoError(t, err)
@@ -33,5 +33,5 @@ func TestSkipSlotCache_RoundTrip(t *testing.T) {

 	res, err := c.Get(ctx, r)
 	require.NoError(t, err)
-	assert.DeepEqual(t, res.ToProto(), s.ToProto(), "Expected equal protos to return from cache")
+	assert.DeepEqual(t, res.CloneInnerState(), s.CloneInnerState(), "Expected equal protos to return from cache")
 }
--- a/beacon-chain/cache/subnet_ids.go
+++ b/beacon-chain/cache/subnet_ids.go
@@ -8,7 +8,7 @@ import (
 	"github.com/patrickmn/go-cache"
 	lruwrpr "github.com/prysmaticlabs/prysm/v3/cache/lru"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/container/slice"
 )

@@ -37,7 +37,7 @@ func newSubnetIDs() *subnetIDs {
 }

 // AddAttesterSubnetID adds the subnet index for subscribing subnet for the attester of a given slot.
-func (s *subnetIDs) AddAttesterSubnetID(slot primitives.Slot, subnetID uint64) {
+func (s *subnetIDs) AddAttesterSubnetID(slot types.Slot, subnetID uint64) {
 	s.attesterLock.Lock()
 	defer s.attesterLock.Unlock()

@@ -50,7 +50,7 @@ func (s *subnetIDs) AddAttesterSubnetID(slot primitives.Slot, subnetID uint64) {
 }

 // GetAttesterSubnetIDs gets the subnet IDs for subscribed subnets for attesters of the slot.
-func (s *subnetIDs) GetAttesterSubnetIDs(slot primitives.Slot) []uint64 {
+func (s *subnetIDs) GetAttesterSubnetIDs(slot types.Slot) []uint64 {
 	s.attesterLock.RLock()
 	defer s.attesterLock.RUnlock()

@@ -65,7 +65,7 @@ func (s *subnetIDs) GetAttesterSubnetIDs(slot primitives.Slot) []uint64 {
 }

 // AddAggregatorSubnetID adds the subnet ID for subscribing subnet for the aggregator of a given slot.
-func (s *subnetIDs) AddAggregatorSubnetID(slot primitives.Slot, subnetID uint64) {
+func (s *subnetIDs) AddAggregatorSubnetID(slot types.Slot, subnetID uint64) {
 	s.aggregatorLock.Lock()
 	defer s.aggregatorLock.Unlock()

@@ -78,7 +78,7 @@ func (s *subnetIDs) AddAggregatorSubnetID(slot primitives.Slot, subnetID uint64)
 }

 // GetAggregatorSubnetIDs gets the subnet IDs for subscribing subnet for aggregator of the slot.
-func (s *subnetIDs) GetAggregatorSubnetIDs(slot primitives.Slot) []uint64 {
+func (s *subnetIDs) GetAggregatorSubnetIDs(slot types.Slot) []uint64 {
 	s.aggregatorLock.RLock()
 	defer s.aggregatorLock.RUnlock()

--- a/beacon-chain/cache/subnet_ids_test.go
+++ b/beacon-chain/cache/subnet_ids_test.go
@@ -4,14 +4,14 @@ import (
 	"testing"

 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/testing/assert"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 )

 func TestSubnetIDsCache_RoundTrip(t *testing.T) {
 	c := newSubnetIDs()
-	slot := primitives.Slot(100)
+	slot := types.Slot(100)
 	committeeIDs := c.GetAggregatorSubnetIDs(slot)
 	assert.Equal(t, 0, len(committeeIDs), "Empty cache returned an object")

--- a/beacon-chain/cache/sync_committee.go
+++ b/beacon-chain/cache/sync_committee.go
@@ -8,7 +8,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
 	"k8s.io/client-go/tools/cache"
 )
@@ -40,13 +40,13 @@ type SyncCommitteeCache struct {
 // are cached where key is the validator index and the value is the `positionInCommittee` struct.
 type syncCommitteeIndexPosition struct {
 	currentSyncCommitteeRoot [32]byte
-	vIndexToPositionMap      map[primitives.ValidatorIndex]*positionInCommittee
+	vIndexToPositionMap      map[types.ValidatorIndex]*positionInCommittee
 }

 // Index position of individual validator of current period and next period sync committee.
 type positionInCommittee struct {
-	currentPeriod []primitives.CommitteeIndex
-	nextPeriod    []primitives.CommitteeIndex
+	currentPeriod []types.CommitteeIndex
+	nextPeriod    []types.CommitteeIndex
 }

 // NewSyncCommittee initializes and returns a new SyncCommitteeCache.
@@ -60,7 +60,7 @@ func NewSyncCommittee() *SyncCommitteeCache {
 // sync committee. If the input validator index has no assignment, an empty list will be returned.
 // If the input root does not exist in cache, `ErrNonExistingSyncCommitteeKey` is returned.
 // Manual checking of state for index position in state is recommended when `ErrNonExistingSyncCommitteeKey` is returned.
-func (s *SyncCommitteeCache) CurrentPeriodIndexPosition(root [32]byte, valIdx primitives.ValidatorIndex) ([]primitives.CommitteeIndex, error) {
+func (s *SyncCommitteeCache) CurrentPeriodIndexPosition(root [32]byte, valIdx types.ValidatorIndex) ([]types.CommitteeIndex, error) {
 	s.lock.RLock()
 	defer s.lock.RUnlock()

@@ -69,7 +69,7 @@ func (s *SyncCommitteeCache) CurrentPeriodIndexPosition(root [32]byte, valIdx pr
 		return nil, err
 	}
 	if pos == nil {
-		return []primitives.CommitteeIndex{}, nil
+		return []types.CommitteeIndex{}, nil
 	}

 	return pos.currentPeriod, nil
@@ -79,7 +79,7 @@ func (s *SyncCommitteeCache) CurrentPeriodIndexPosition(root [32]byte, valIdx pr
 // If the input validator index has no assignment, an empty list will be returned.
 // If the input root does not exist in cache, `ErrNonExistingSyncCommitteeKey` is returned.
 // Manual checking of state for index position in state is recommended when `ErrNonExistingSyncCommitteeKey` is returned.
-func (s *SyncCommitteeCache) NextPeriodIndexPosition(root [32]byte, valIdx primitives.ValidatorIndex) ([]primitives.CommitteeIndex, error) {
+func (s *SyncCommitteeCache) NextPeriodIndexPosition(root [32]byte, valIdx types.ValidatorIndex) ([]types.CommitteeIndex, error) {
 	s.lock.RLock()
 	defer s.lock.RUnlock()

@@ -88,7 +88,7 @@ func (s *SyncCommitteeCache) NextPeriodIndexPosition(root [32]byte, valIdx primi
 		return nil, err
 	}
 	if pos == nil {
-		return []primitives.CommitteeIndex{}, nil
+		return []types.CommitteeIndex{}, nil
 	}
 	return pos.nextPeriod, nil
 }
@@ -96,7 +96,7 @@ func (s *SyncCommitteeCache) NextPeriodIndexPosition(root [32]byte, valIdx primi
 // Helper function for `CurrentPeriodIndexPosition` and `NextPeriodIndexPosition` to return a mapping
 // of validator index to its index(s) position in the sync committee.
 func (s *SyncCommitteeCache) idxPositionInCommittee(
-	root [32]byte, valIdx primitives.ValidatorIndex,
+	root [32]byte, valIdx types.ValidatorIndex,
 ) (*positionInCommittee, error) {
 	obj, exists, err := s.cache.GetByKey(key(root))
 	if err != nil {
@@ -127,7 +127,7 @@ func (s *SyncCommitteeCache) UpdatePositionsInCommittee(syncCommitteeBoundaryRoo
 	if err != nil {
 		return err
 	}
-	positionsMap := make(map[primitives.ValidatorIndex]*positionInCommittee)
+	positionsMap := make(map[types.ValidatorIndex]*positionInCommittee)
 	for i, pubkey := range csc.Pubkeys {
 		p := bytesutil.ToBytes48(pubkey)
 		validatorIndex, ok := st.ValidatorIndexByPubkey(p)
@@ -135,10 +135,10 @@ func (s *SyncCommitteeCache) UpdatePositionsInCommittee(syncCommitteeBoundaryRoo
 			continue
 		}
 		if _, ok := positionsMap[validatorIndex]; !ok {
-			m := &positionInCommittee{currentPeriod: []primitives.CommitteeIndex{primitives.CommitteeIndex(i)}, nextPeriod: []primitives.CommitteeIndex{}}
+			m := &positionInCommittee{currentPeriod: []types.CommitteeIndex{types.CommitteeIndex(i)}, nextPeriod: []types.CommitteeIndex{}}
 			positionsMap[validatorIndex] = m
 		} else {
-			positionsMap[validatorIndex].currentPeriod = append(positionsMap[validatorIndex].currentPeriod, primitives.CommitteeIndex(i))
+			positionsMap[validatorIndex].currentPeriod = append(positionsMap[validatorIndex].currentPeriod, types.CommitteeIndex(i))
 		}
 	}

@@ -153,10 +153,10 @@ func (s *SyncCommitteeCache) UpdatePositionsInCommittee(syncCommitteeBoundaryRoo
 			continue
 		}
 		if _, ok := positionsMap[validatorIndex]; !ok {
-			m := &positionInCommittee{nextPeriod: []primitives.CommitteeIndex{primitives.CommitteeIndex(i)}, currentPeriod: []primitives.CommitteeIndex{}}
+			m := &positionInCommittee{nextPeriod: []types.CommitteeIndex{types.CommitteeIndex(i)}, currentPeriod: []types.CommitteeIndex{}}
 			positionsMap[validatorIndex] = m
 		} else {
-			positionsMap[validatorIndex].nextPeriod = append(positionsMap[validatorIndex].nextPeriod, primitives.CommitteeIndex(i))
+			positionsMap[validatorIndex].nextPeriod = append(positionsMap[validatorIndex].nextPeriod, types.CommitteeIndex(i))
 		}
 	}

--- a/beacon-chain/cache/sync_committee_disabled.go
+++ b/beacon-chain/cache/sync_committee_disabled.go
@@ -4,7 +4,7 @@ package cache

 import (
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 )

 // FakeSyncCommitteeCache is a fake `SyncCommitteeCache` to satisfy fuzzing.
@@ -17,12 +17,12 @@ func NewSyncCommittee() *FakeSyncCommitteeCache {
 }

 // CurrentEpochIndexPosition -- fake.
-func (s *FakeSyncCommitteeCache) CurrentPeriodIndexPosition(root [32]byte, valIdx primitives.ValidatorIndex) ([]primitives.CommitteeIndex, error) {
+func (s *FakeSyncCommitteeCache) CurrentPeriodIndexPosition(root [32]byte, valIdx types.ValidatorIndex) ([]types.CommitteeIndex, error) {
 	return nil, nil
 }

 // NextEpochIndexPosition -- fake.
-func (s *FakeSyncCommitteeCache) NextPeriodIndexPosition(root [32]byte, valIdx primitives.ValidatorIndex) ([]primitives.CommitteeIndex, error) {
+func (s *FakeSyncCommitteeCache) NextPeriodIndexPosition(root [32]byte, valIdx types.ValidatorIndex) ([]types.CommitteeIndex, error) {
 	return nil, nil
 }

--- a/beacon-chain/cache/sync_committee_head_state.go
+++ b/beacon-chain/cache/sync_committee_head_state.go
@@ -6,7 +6,7 @@ import (
 	lru "github.com/hashicorp/golang-lru"
 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
 	lruwrpr "github.com/prysmaticlabs/prysm/v3/cache/lru"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/runtime/version"
 )

@@ -23,7 +23,7 @@ func NewSyncCommitteeHeadState() *SyncCommitteeHeadStateCache {
 }

 // Put `slot` as key and `state` as value onto the cache.
-func (c *SyncCommitteeHeadStateCache) Put(slot primitives.Slot, st state.BeaconState) error {
+func (c *SyncCommitteeHeadStateCache) Put(slot types.Slot, st state.BeaconState) error {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 	// Make sure that the provided state is non nil
@@ -41,7 +41,7 @@ func (c *SyncCommitteeHeadStateCache) Put(slot primitives.Slot, st state.BeaconS
 }

 // Get `state` using `slot` as key. Return nil if nothing is found.
-func (c *SyncCommitteeHeadStateCache) Get(slot primitives.Slot) (state.BeaconState, error) {
+func (c *SyncCommitteeHeadStateCache) Get(slot types.Slot) (state.BeaconState, error) {
 	c.lock.RLock()
 	defer c.lock.RUnlock()
 	val, exists := c.cache.Get(slot)
@@ -52,8 +52,9 @@ func (c *SyncCommitteeHeadStateCache) Get(slot primitives.Slot) (state.BeaconSta
 	if !ok {
 		return nil, ErrIncorrectType
 	}
-	// Sync committee is not supported in phase 0.
-	if st.Version() == version.Phase0 {
+	switch st.Version() {
+	case version.Altair, version.Bellatrix:
+	default:
 		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
@@ -4,36 +4,31 @@ import (
 	"testing"

 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/state"
-	state_native "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/state-native"
+	v1 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v1"
+	v2 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v2"
+	v3 "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v3"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 )

 func TestSyncCommitteeHeadState(t *testing.T) {
-	beaconState, err := state_native.InitializeFromProtoAltair(&ethpb.BeaconStateAltair{
+	beaconState, err := v2.InitializeFromProto(&ethpb.BeaconStateAltair{
 		Fork: &ethpb.Fork{
 			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
 			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
 		},
 	})
 	require.NoError(t, err)
-	phase0State, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{
+	phase0State, err := v1.InitializeFromProto(&ethpb.BeaconState{
 		Fork: &ethpb.Fork{
 			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
 			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
 		},
 	})
 	require.NoError(t, err)
-	bellatrixState, err := state_native.InitializeFromProtoBellatrix(&ethpb.BeaconStateBellatrix{
-		Fork: &ethpb.Fork{
-			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
-			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
-		},
-	})
-	require.NoError(t, err)
-	capellaState, err := state_native.InitializeFromProtoCapella(&ethpb.BeaconStateCapella{
+	bellatrixState, err := v3.InitializeFromProto(&ethpb.BeaconStateBellatrix{
 		Fork: &ethpb.Fork{
 			PreviousVersion: params.BeaconConfig().GenesisForkVersion,
 			CurrentVersion:  params.BeaconConfig().GenesisForkVersion,
@@ -41,12 +36,12 @@ func TestSyncCommitteeHeadState(t *testing.T) {
 	})
 	require.NoError(t, err)
 	type put struct {
-		slot  primitives.Slot
+		slot  types.Slot
 		state state.BeaconState
 	}
 	tests := []struct {
 		name       string
-		key        primitives.Slot
+		key        types.Slot
 		put        *put
 		want       state.BeaconState
 		wantErr    bool
@@ -54,9 +49,9 @@ func TestSyncCommitteeHeadState(t *testing.T) {
 	}{
 		{
 			name: "putting error in",
-			key:  primitives.Slot(1),
+			key:  types.Slot(1),
 			put: &put{
-				slot:  primitives.Slot(1),
+				slot:  types.Slot(1),
 				state: nil,
 			},
 			wantPutErr: true,
@@ -64,9 +59,9 @@ func TestSyncCommitteeHeadState(t *testing.T) {
 		},
 		{
 			name: "putting invalid state in",
-			key:  primitives.Slot(1),
+			key:  types.Slot(1),
 			put: &put{
-				slot:  primitives.Slot(1),
+				slot:  types.Slot(1),
 				state: phase0State,
 			},
 			wantPutErr: true,
@@ -74,54 +69,45 @@ func TestSyncCommitteeHeadState(t *testing.T) {
 		},
 		{
 			name:    "not found when empty cache",
-			key:     primitives.Slot(1),
+			key:     types.Slot(1),
 			wantErr: true,
 		},
 		{
 			name: "not found when non-existent key in non-empty cache",
-			key:  primitives.Slot(2),
+			key:  types.Slot(2),
 			put: &put{
-				slot:  primitives.Slot(1),
+				slot:  types.Slot(1),
 				state: beaconState,
 			},
 			wantErr: true,
 		},
 		{
 			name: "found with key",
-			key:  primitives.Slot(1),
+			key:  types.Slot(1),
 			put: &put{
-				slot:  primitives.Slot(1),
+				slot:  types.Slot(1),
 				state: beaconState,
 			},
 			want: beaconState,
 		},
 		{
 			name: "not found when non-existent key in non-empty cache (bellatrix state)",
-			key:  primitives.Slot(2),
+			key:  types.Slot(2),
 			put: &put{
-				slot:  primitives.Slot(1),
+				slot:  types.Slot(1),
 				state: bellatrixState,
 			},
 			wantErr: true,
 		},
 		{
 			name: "found with key (bellatrix state)",
-			key:  primitives.Slot(100),
+			key:  types.Slot(100),
 			put: &put{
-				slot:  primitives.Slot(100),
+				slot:  types.Slot(100),
 				state: bellatrixState,
 			},
 			want: bellatrixState,
 		},
-		{
-			name: "found with key (capella state)",
-			key:  primitives.Slot(200),
-			put: &put{
-				slot:  primitives.Slot(200),
-				state: capellaState,
-			},
-			want: capellaState,
-		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
--- a/beacon-chain/cache/sync_committee_test.go
+++ b/beacon-chain/cache/sync_committee_test.go
@@ -4,7 +4,7 @@ import (
 	"testing"

 	"github.com/prysmaticlabs/prysm/v3/beacon-chain/cache"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/testing/require"
 	"github.com/prysmaticlabs/prysm/v3/testing/util"
@@ -21,8 +21,8 @@ func TestSyncCommitteeCache_CanUpdateAndRetrieve(t *testing.T) {
 		name                 string
 		currentSyncCommittee *ethpb.SyncCommittee
 		nextSyncCommittee    *ethpb.SyncCommittee
-		currentSyncMap       map[primitives.ValidatorIndex][]primitives.CommitteeIndex
-		nextSyncMap          map[primitives.ValidatorIndex][]primitives.CommitteeIndex
+		currentSyncMap       map[types.ValidatorIndex][]types.CommitteeIndex
+		nextSyncMap          map[types.ValidatorIndex][]types.CommitteeIndex
 	}{
 		{
 			name: "only current epoch",
@@ -30,12 +30,12 @@ func TestSyncCommitteeCache_CanUpdateAndRetrieve(t *testing.T) {
 				pubKeys[1], pubKeys[2], pubKeys[3], pubKeys[2], pubKeys[2],
 			}),
 			nextSyncCommittee: util.ConvertToCommittee([][]byte{}),
-			currentSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			currentSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {0},
 				2: {1, 3, 4},
 				3: {2},
 			},
-			nextSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			nextSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {},
 				2: {},
 				3: {},
@@ -47,12 +47,12 @@ func TestSyncCommitteeCache_CanUpdateAndRetrieve(t *testing.T) {
 			nextSyncCommittee: util.ConvertToCommittee([][]byte{
 				pubKeys[1], pubKeys[2], pubKeys[3], pubKeys[2], pubKeys[2],
 			}),
-			currentSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			currentSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {},
 				2: {},
 				3: {},
 			},
-			nextSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			nextSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {0},
 				2: {1, 3, 4},
 				3: {2},
@@ -74,12 +74,12 @@ func TestSyncCommitteeCache_CanUpdateAndRetrieve(t *testing.T) {
 				pubKeys[4],
 				pubKeys[7],
 			}),
-			currentSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			currentSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {0},
 				2: {1, 3, 4},
 				3: {2},
 			},
-			nextSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			nextSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				7: {0, 4},
 				6: {1},
 				5: {2},
@@ -102,12 +102,12 @@ func TestSyncCommitteeCache_CanUpdateAndRetrieve(t *testing.T) {
 				pubKeys[2],
 				pubKeys[1],
 			}),
-			currentSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			currentSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {0},
 				2: {1, 3, 4},
 				3: {2},
 			},
-			nextSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			nextSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {1, 4},
 				2: {0, 3},
 				3: {2},
@@ -127,10 +127,10 @@ func TestSyncCommitteeCache_CanUpdateAndRetrieve(t *testing.T) {
 				pubKeys[100],
 				pubKeys[100],
 			}),
-			currentSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			currentSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				100: {0, 1, 2, 3},
 			},
-			nextSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			nextSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				100: {0, 1, 2, 3},
 			},
 		},
@@ -148,10 +148,10 @@ func TestSyncCommitteeCache_CanUpdateAndRetrieve(t *testing.T) {
 				pubKeys[100],
 				pubKeys[100],
 			}),
-			currentSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			currentSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {},
 			},
-			nextSyncMap: map[primitives.ValidatorIndex][]primitives.CommitteeIndex{
+			nextSyncMap: map[types.ValidatorIndex][]types.CommitteeIndex{
 				1: {},
 			},
 		},
--- a/beacon-chain/cache/sync_subnet_ids.go
+++ b/beacon-chain/cache/sync_subnet_ids.go
@@ -6,7 +6,7 @@ import (

 	"github.com/patrickmn/go-cache"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/container/slice"
 	"github.com/prysmaticlabs/prysm/v3/crypto/rand"
 	"github.com/prysmaticlabs/prysm/v3/encoding/bytesutil"
@@ -29,7 +29,7 @@ func newSyncSubnetIDs() *syncSubnetIDs {
 }

 // GetSyncCommitteeSubnets retrieves the sync committee subnet and expiration time of that validator's subscription.
-func (s *syncSubnetIDs) GetSyncCommitteeSubnets(pubkey []byte, epoch primitives.Epoch) ([]uint64, primitives.Epoch, bool, time.Time) {
+func (s *syncSubnetIDs) GetSyncCommitteeSubnets(pubkey []byte, epoch types.Epoch) ([]uint64, types.Epoch, bool, time.Time) {
 	s.sCommiteeLock.RLock()
 	defer s.sCommiteeLock.RUnlock()

@@ -50,13 +50,13 @@ func (s *syncSubnetIDs) GetSyncCommitteeSubnets(pubkey []byte, epoch primitives.
 	// Index 0 was used to store validator's join epoch. We do not
 	// return it to the caller.
 	// Index 1 and beyond were used to store subnets.
-	return idxs[1:], primitives.Epoch(idxs[0]), ok, duration
+	return idxs[1:], types.Epoch(idxs[0]), ok, duration
 }

 // GetAllSubnets retrieves all the non-expired subscribed subnets of all the validators
 // in the cache. This method also takes the epoch as an argument to only retrieve
 // assignments for epochs that have happened.
-func (s *syncSubnetIDs) GetAllSubnets(currEpoch primitives.Epoch) []uint64 {
+func (s *syncSubnetIDs) GetAllSubnets(currEpoch types.Epoch) []uint64 {
 	s.sCommiteeLock.RLock()
 	defer s.sCommiteeLock.RUnlock()

@@ -79,7 +79,7 @@ func (s *syncSubnetIDs) GetAllSubnets(currEpoch primitives.Epoch) []uint64 {
 		// Check if the subnet is valid in the current epoch. If our
 		// join epoch is still in the future we skip retrieving the
 		// relevant committee index.
-		if primitives.Epoch(idxs[0]) > currEpoch {
+		if types.Epoch(idxs[0]) > currEpoch {
 			continue
 		}
 		// Ignore the first index as that represents the
@@ -92,7 +92,7 @@ func (s *syncSubnetIDs) GetAllSubnets(currEpoch primitives.Epoch) []uint64 {
 // AddSyncCommitteeSubnets adds the relevant committee for that particular validator along with its
 // expiration period. An Epoch argument here denotes the epoch from which the sync committee subnets
 // will be active.
-func (s *syncSubnetIDs) AddSyncCommitteeSubnets(pubkey []byte, epoch primitives.Epoch, comIndex []uint64, duration time.Duration) {
+func (s *syncSubnetIDs) AddSyncCommitteeSubnets(pubkey []byte, epoch types.Epoch, comIndex []uint64, duration time.Duration) {
 	s.sCommiteeLock.Lock()
 	defer s.sCommiteeLock.Unlock()
 	subComCount := params.BeaconConfig().SyncCommitteeSubnetCount
@@ -125,7 +125,7 @@ func (s *syncSubnetIDs) EmptyAllCaches() {

 // build a key composed of both the pubkey and epoch here. The epoch
 // here would be the 1st epoch of the sync committee period.
-func keyBuilder(pubkey []byte, epoch primitives.Epoch) string {
+func keyBuilder(pubkey []byte, epoch types.Epoch) string {
 	epochBytes := bytesutil.Bytes8(uint64(epoch))
 	return string(append(pubkey, epochBytes...))
 }
--- a/beacon-chain/core/altair/BUILD.bazel
+++ b/beacon-chain/core/altair/BUILD.bazel
@@ -14,7 +14,13 @@ go_library(
        "upgrade.go",
    ],
    importpath = "github.com/prysmaticlabs/prysm/v3/beacon-chain/core/altair",
-    visibility = ["//visibility:public"],
+    visibility = [
+        "//beacon-chain:__subpackages__",
+        "//testing/endtoend/evaluators:__subpackages__",
+        "//testing/spectest:__subpackages__",
+        "//testing/util:__pkg__",
+        "//validator/client:__pkg__",
+    ],
    deps = [
        "//beacon-chain/core/blocks:go_default_library",
        "//beacon-chain/core/epoch:go_default_library",
@@ -24,7 +30,7 @@ go_library(
        "//beacon-chain/core/time:go_default_library",
        "//beacon-chain/p2p/types:go_default_library",
        "//beacon-chain/state:go_default_library",
-        "//beacon-chain/state/state-native:go_default_library",
+        "//beacon-chain/state/v2:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/blocks:go_default_library",
@@ -52,7 +58,6 @@ 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",
@@ -67,7 +72,8 @@ go_test(
        "//beacon-chain/core/time:go_default_library",
        "//beacon-chain/p2p/types:go_default_library",
        "//beacon-chain/state:go_default_library",
-        "//beacon-chain/state/state-native:go_default_library",
+        "//beacon-chain/state/v2:go_default_library",
+        "//beacon-chain/state/v3:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/blocks:go_default_library",
--- a/beacon-chain/core/altair/attestation.go
+++ b/beacon-chain/core/altair/attestation.go
@@ -13,7 +13,7 @@ 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"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1/attestation"
 	"go.opencensus.io/trace"
@@ -82,28 +82,27 @@ 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
 //
-//	 # 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
 //
-//	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)
+//    # 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,
-	targetEpoch primitives.Epoch,
+	targetEpoch types.Epoch,
 	indices []uint64,
 	participatedFlags map[uint8]bool, totalBalance uint64) (state.BeaconState, error) {
 	var proposerRewardNumerator uint64
@@ -158,13 +157,12 @@ 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
@@ -175,7 +173,7 @@ func EpochParticipation(beaconState state.BeaconState, indices []uint64, epochPa
 		if index >= uint64(len(epochParticipation)) {
 			return 0, nil, fmt.Errorf("index %d exceeds participation length %d", index, len(epochParticipation))
 		}
-		br, err := BaseRewardWithTotalBalance(beaconState, primitives.ValidatorIndex(index), totalBalance)
+		br, err := BaseRewardWithTotalBalance(beaconState, types.ValidatorIndex(index), totalBalance)
 		if err != nil {
 			return 0, nil, err
 		}
@@ -220,10 +218,9 @@ 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
@@ -241,33 +238,32 @@ 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
 //
-//	                                           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
 //
-//	# 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
+//    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)
 //
-//	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 primitives.Slot) (map[uint8]bool, error) {
+//    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
 	if data.Target.Epoch == currEpoch {
@@ -308,10 +304,9 @@ 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
@@ -12,11 +12,11 @@ import (
 	"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"
+	stateAltair "github.com/prysmaticlabs/prysm/v3/beacon-chain/state/v2"
 	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/primitives"
+	types "github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v3/crypto/bls"
 	"github.com/prysmaticlabs/prysm/v3/math"
 	ethpb "github.com/prysmaticlabs/prysm/v3/proto/prysm/v1alpha1"
@@ -256,7 +256,7 @@ func TestProcessAttestationNoVerify_SourceTargetHead(t *testing.T) {
 		},
 		AggregationBits: aggBits,
 	}
-	var zeroSig [96]byte
+	zeroSig := [96]byte{}
 	att.Signature = zeroSig[:]

 	ckp := beaconState.CurrentJustifiedCheckpoint()
@@ -419,7 +419,7 @@ func TestFuzzProcessAttestationsNoVerify_10000(t *testing.T) {
 		if b.Block == nil {
 			b.Block = &ethpb.BeaconBlockAltair{}
 		}
-		s, err := state_native.InitializeFromProtoUnsafeAltair(st)
+		s, err := stateAltair.InitializeFromProtoUnsafe(st)
 		require.NoError(t, err)
 		if b.Block == nil || b.Block.Body == nil {
 			continue
@@ -443,7 +443,7 @@ func TestSetParticipationAndRewardProposer(t *testing.T) {
 		indices             []uint64
 		epochParticipation  []byte
 		participatedFlags   map[uint8]bool
-		epoch               primitives.Epoch
+		epoch               types.Epoch
 		wantedBalance       uint64
 		wantedParticipation []byte
 	}{
@@ -634,7 +634,7 @@ func TestAttestationParticipationFlagIndices(t *testing.T) {
 		name                 string
 		inputState           state.BeaconState
 		inputData            *ethpb.AttestationData
-		inputDelay           primitives.Slot
+		inputDelay           types.Slot
 		participationIndices map[uint8]bool
 	}{
 		{
@@ -658,7 +658,7 @@ func TestAttestationParticipationFlagIndices(t *testing.T) {
 				Source: &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]},
 				Target: &ethpb.Checkpoint{},
 			},
-			inputDelay: primitives.Slot(math.IntegerSquareRoot(uint64(cfg.SlotsPerEpoch)) - 1),
+			inputDelay: types.Slot(math.IntegerSquareRoot(uint64(cfg.SlotsPerEpoch)) - 1),
 			participationIndices: map[uint8]bool{
 				sourceFlagIndex: true,
 			},
@@ -672,7 +672,7 @@ func TestAttestationParticipationFlagIndices(t *testing.T) {
 				Source: &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]},
 				Target: &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]},
 			},
-			inputDelay: primitives.Slot(math.IntegerSquareRoot(uint64(cfg.SlotsPerEpoch)) - 1),
+			inputDelay: types.Slot(math.IntegerSquareRoot(uint64(cfg.SlotsPerEpoch)) - 1),
 			participationIndices: map[uint8]bool{
 				sourceFlagIndex: true,
 				targetFlagIndex: true,
--- a/beacon-chain/core/altair/block.go
+++ b/beacon-chain/core/altair/block.go
@@ -9,6 +9,7 @@ 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"
@@ -19,33 +20,32 @@ 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)
 //
-//	# 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))
 //
-//	# 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)
+//    # 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) {
-	s, votedKeys, err := processSyncAggregate(ctx, s, sync)
+	votedKeys, votedIndices, didntVoteIndices, err := FilterSyncCommitteeVotes(s, sync)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not filter sync committee votes")
 	}
@@ -53,70 +53,50 @@ 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 s, nil
+
+	return ApplySyncRewardsPenalties(ctx, s, votedIndices, didntVoteIndices)
 }

-// 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) {
+// 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) {
 	currentSyncCommittee, err := s.CurrentSyncCommittee()
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
 	if currentSyncCommittee == nil {
-		return nil, nil, errors.New("nil current sync committee in state")
+		return nil, nil, nil, errors.New("nil current sync committee in state")
 	}
 	committeeKeys := currentSyncCommittee.Pubkeys
 	if sync.SyncCommitteeBits.Len() > uint64(len(committeeKeys)) {
-		return nil, nil, errors.New("bits length exceeds committee length")
+		return nil, nil, nil, errors.New("bits length exceeds committee length")
 	}
-	votedKeys := make([]bls.PublicKey, 0, len(committeeKeys))
+	votedKeys = make([]bls.PublicKey, 0, len(committeeKeys))
+	votedIndices = make([]types.ValidatorIndex, 0, len(committeeKeys))
+	didntVoteIndices = make([]types.ValidatorIndex, 0) // No allocation. Expect most votes.

-	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, errors.New("validator public key does not exist in state")
+			return nil, 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, err
+				return nil, nil, nil, err
 			}
 			votedKeys = append(votedKeys, pubKey)
-			if err := helpers.IncreaseBalance(s, vIdx, participantReward); err != nil {
-				return nil, nil, err
-			}
-			earnedProposerReward += proposerReward
+			votedIndices = append(votedIndices, vIdx)
 		} else {
-			if err := helpers.DecreaseBalance(s, vIdx, participantReward); err != nil {
-				return nil, nil, err
-			}
+			didntVoteIndices = append(didntVoteIndices, vIdx)
 		}
 	}
-	if err := helpers.IncreaseBalance(s, proposerIndex, earnedProposerReward); err != nil {
-		return nil, nil, err
-	}
-	return s, votedKeys, err
+	return
 }

 // VerifySyncCommitteeSig verifies sync committee signature `syncSig` is valid with respect to public keys `syncKeys`.
@@ -145,6 +125,43 @@ 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
@@ -13,7 +13,7 @@ import (
 	p2pType "github.com/prysmaticlabs/prysm/v3/beacon-chain/p2p/types"
 	fieldparams "github.com/prysmaticlabs/prysm/v3/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v3/config/params"
-	"github.com/prysmaticlabs/prysm/v3/consensus-types/primitives"
+	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"
@@ -57,12 +57,12 @@ func TestProcessSyncCommittee_PerfectParticipation(t *testing.T) {
 	require.NoError(t, err)

 	// Use a non-sync committee index to compare profitability.
-	syncCommittee := make(map[primitives.ValidatorIndex]bool)
+	syncCommittee := make(map[types.ValidatorIndex]bool)
 	for _, index := range indices {
 		syncCommittee[index] = true
 	}
-	nonSyncIndex := primitives.ValidatorIndex(params.BeaconConfig().MaxValidatorsPerCommittee + 1)
-	for i := primitives.ValidatorIndex(0); uint64(i) < params.BeaconConfig().MaxValidatorsPerCommittee; i++ {
+	nonSyncIndex := types.ValidatorIndex(params.BeaconConfig().MaxValidatorsPerCommittee + 1)
+	for i := types.ValidatorIndex(0); uint64(i) < params.BeaconConfig().MaxValidatorsPerCommittee; i++ {
 		if !syncCommittee[i] {
 			nonSyncIndex = i
 			break
@@ -168,36 +168,7 @@ func TestProcessSyncCommittee_MixParticipation_GoodSignature(t *testing.T) {
 	require.NoError(t, err)
 }

-// 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) {
+func TestProcessSyncCommittee_FilterSyncCommitteeVotes(t *testing.T) {
 	beaconState, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().MaxValidatorsPerCommittee)
 	require.NoError(t, beaconState.SetSlot(1))
 	committee, err := altair.NextSyncCommittee(context.Background(), beaconState)
@@ -212,40 +183,25 @@ func TestProcessSyncCommittee_processSyncAggregate(t *testing.T) {
 		SyncCommitteeBits: syncBits,
 	}

-	st, votedKeys, err := altair.ProcessSyncAggregateEported(context.Background(), beaconState, syncAggregate)
+	votedKeys, votedIndices, didntVoteIndices, err := altair.FilterSyncCommitteeVotes(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))
-
-	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)
+	require.Equal(t, int(syncBits.Len()/2), len(votedIndices))
+	require.Equal(t, int(syncBits.Len()/2), len(didntVoteIndices))

 	for i := 0; i < len(syncBits); i++ {
 		if syncBits.BitAt(uint64(i)) {
-			pk := bytesutil.ToBytes48(committeeKeys[i])
+			pk := beaconState.PubkeyAtIndex(votedIndices[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 := bytesutil.ToBytes48(committeeKeys[i])
+			pk := beaconState.PubkeyAtIndex(didntVoteIndices[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) {
@@ -284,6 +240,22 @@ 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/Show More
+++ b/Show More
@@ -1 +1 @@
 .3.0
 .0.0
				`@@ -1 +0,0 @@`
				{"parent_hash":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","fee_recipient":"0xabcf8e0d4e9587369b2301d0790347320302cc09","state_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","receipts_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","logs_bloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","prev_randao":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","block_number":"1","gas_limit":"1","gas_used":"1","timestamp":"1","extra_data":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","base_fee_per_gas":"14074904626401341155369551180448584754667373453244490859944217516317499064576","block_hash":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","transactions_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","withdrawals_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"}