remove commented code

bump geth to latest
adapt genesis.json for post-merge conditions
2026-01-11 06:18:05 -05:00 · 2023-05-04 10:15:26 -05:00 · 2023-05-04 10:13:53 -05:00 · 2023-05-04 09:39:50 -05:00 · 2023-05-03 21:06:24 -05:00 · 2023-05-03 16:15:50 -05:00
456 changed files with 5867 additions and 19085 deletions
--- a/.bazelrc
+++ b/.bazelrc
@@ -3,7 +3,6 @@ import %workspace%/build/bazelrc/convenience.bazelrc
 import %workspace%/build/bazelrc/correctness.bazelrc
 import %workspace%/build/bazelrc/cross.bazelrc
 import %workspace%/build/bazelrc/debug.bazelrc
-import %workspace%/build/bazelrc/hermetic-cc.bazelrc
 import %workspace%/build/bazelrc/performance.bazelrc

 # E2E run with debug gotag
@@ -15,7 +14,7 @@ coverage --define=coverage_enabled=1
 # Stamp binaries with git information
 build --workspace_status_command=./hack/workspace_status.sh

-build --define blst_disabled=false --define blst_modern=true
+build --define blst_disabled=false
 run --define blst_disabled=false

 build:blst_disabled --define blst_disabled=true
@@ -28,7 +27,30 @@ build:minimal --@io_bazel_rules_go//go/config:tags=minimal
 build:release --compilation_mode=opt
 build:release --stamp

+# LLVM compiler for building C/C++ dependencies.
+build:llvm --define compiler=llvm
+build:llvm --copt -fno-sanitize=vptr,function
+build:llvm --linkopt -fno-sanitize=vptr,function
+# --incompatible_enable_cc_toolchain_resolution not needed after this issue is closed https://github.com/bazelbuild/bazel/issues/7260
+build:llvm --incompatible_enable_cc_toolchain_resolution
+
+build:asan --copt -fsanitize=address,undefined
+build:asan --copt -fno-omit-frame-pointer
+build:asan --linkopt -fsanitize=address,undefined
+build:asan --copt -fno-sanitize=vptr,function
+build:asan --linkopt -fno-sanitize=vptr,function
+build:asan --copt -DADDRESS_SANITIZER=1
+build:asan --copt -D__SANITIZE_ADDRESS__
+build:asan --linkopt -ldl
+
+build:llvm-asan --config=llvm
+build:llvm-asan --config=asan
+build:llvm-asan --linkopt -fuse-ld=ld.lld
+
+build:fuzz --@io_bazel_rules_go//go/config:tags=fuzz
+
 # Build binary with cgo symbolizer for debugging / profiling.
+build:cgo_symbolizer --config=llvm
 build:cgo_symbolizer --copt=-g
 build:cgo_symbolizer --define=USE_CGO_SYMBOLIZER=true
 build:cgo_symbolizer -c dbg
@@ -37,13 +59,9 @@ build:cgo_symbolizer --define=gotags=cgosymbolizer_enabled
 # toolchain build debug configs
 #------------------------------
 build:debug --sandbox_debug
-build:debug --toolchain_resolution_debug=".*"
+build:debug --toolchain_resolution_debug
 build:debug --verbose_failures
 build:debug -s

 # Set bazel gotag
 build --define gotags=bazel
-
-# Abseil requires c++14 or greater.
-build --cxxopt=-std=c++20
-build --host_cxxopt=-std=c++20
--- a/.bazelversion
+++ b/.bazelversion
@@ -1 +1 @@
-6.2.1
+6.1.0
--- a/.buildkite-bazelrc
+++ b/.buildkite-bazelrc
@@ -43,12 +43,4 @@ build --flaky_test_attempts=5

 # Better caching
 build:nostamp --nostamp
-
-# Build metadata
-build --build_metadata=ROLE=CI
-build --build_metadata=REPO_URL=https://github.com/prysmaticlabs/prysm.git
-build --workspace_status_command=./hack/workspace_status_ci.sh
-
-# Buildbuddy
-build --bes_results_url=https://app.buildbuddy.io/invocation/
-build --bes_backend=grpcs://remote.buildbuddy.io
+build:nostamp --workspace_status_command=./hack/workspace_status_ci.sh
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -26,14 +26,14 @@ jobs:
    steps:
      - name: Checkout
        uses: actions/checkout@v2
-      - name: Set up Go 1.20
+      - name: Set up Go 1.19
        uses: actions/setup-go@v3
        with:
-          go-version: '1.20'
+          go-version: 1.19
      - name: Run Gosec Security Scanner
        run: | # https://github.com/securego/gosec/issues/469
          export PATH=$PATH:$(go env GOPATH)/bin
-          go install github.com/securego/gosec/v2/cmd/gosec@v2.15.0
+          go install github.com/securego/gosec/v2/cmd/gosec@v2.12.0
          gosec -exclude=G307 -exclude-dir=crypto/bls/herumi ./...

  lint:
@@ -43,16 +43,16 @@ jobs:
      - name: Checkout
        uses: actions/checkout@v2

-      - name: Set up Go 1.20
+      - name: Set up Go 1.19
        uses: actions/setup-go@v3
        with:
-          go-version: '1.20'
+          go-version: 1.19
          id: go

      - name: Golangci-lint
        uses: golangci/golangci-lint-action@v3
        with:
-          version: v1.52.2
+          version: v1.50.1
          args: --config=.golangci.yml --out-${NO_FUTURE}format colored-line-number

  build:
@@ -62,7 +62,7 @@ jobs:
      - name: Set up Go 1.x
        uses: actions/setup-go@v2
        with:
-          go-version: '1.20'
+          go-version: 1.19
        id: go

      - name: Check out code into the Go module directory
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -3,6 +3,7 @@ load("@com_github_atlassian_bazel_tools//gometalinter:def.bzl", "gometalinter")
 load("@com_github_atlassian_bazel_tools//goimports:def.bzl", "goimports")
 load("@io_kubernetes_build//defs:run_in_workspace.bzl", "workspace_binary")
 load("@io_bazel_rules_go//go:def.bzl", "nogo")
+load("@vaticle_bazel_distribution//common:rules.bzl", "assemble_targz", "assemble_versioned")
 load("@bazel_skylib//rules:common_settings.bzl", "string_setting")

 prefix = "github.com/prysmaticlabs/prysm"
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,6 +1,6 @@
 # Contribution Guidelines

-Note: The latest and most up-to-date documentation can be found on our [docs portal](https://docs.prylabs.network/docs/contribute/contribution-guidelines).
+Note: The latest and most up to date documenation can be found on our [docs portal](https://docs.prylabs.network/docs/contribute/contribution-guidelines).

 Excited by our work and want to get involved in building out our sharding releases? Or maybe you haven't learned as much about the Ethereum protocol but are a savvy developer? 

@@ -10,9 +10,9 @@ You can explore our [Open Issues](https://github.com/prysmaticlabs/prysm/issues)

 **1. Set up Prysm following the instructions in README.md.**

-**2. Fork the Prysm repo.**
+**2. Fork the prysm repo.**

-Sign in to your GitHub account or create a new account if you do not have one already. Then navigate your browser to https://github.com/prysmaticlabs/prysm/. In the upper right hand corner of the page, click “fork”. This will create a copy of the Prysm repo in your account.
+Sign in to your Github account or create a new account if you do not have one already. Then navigate your browser to https://github.com/prysmaticlabs/prysm/. In the upper right hand corner of the page, click “fork”. This will create a copy of the Prysm repo in your account.

 **3. Create a local clone of Prysm.**

@@ -23,7 +23,7 @@ $ git clone https://github.com/prysmaticlabs/prysm.git
 $ cd $GOPATH/src/github.com/prysmaticlabs/prysm
 ```

-**4. Link your local clone to the fork on your GitHub repo.**
+**4. Link your local clone to the fork on your Github repo.**

 ```
 $ git remote add myprysmrepo https://github.com/<your_github_user_name>/prysm.git
@@ -68,7 +68,7 @@ $ go test <file_you_are_working_on>
 $ git add --all
 ```

-This command stages all the files that you have changed. You can add individual files by specifying the file name or names and eliminating the “-- all”.
+This command stages all of the files that you have changed. You can add individual files by specifying the file name or names and eliminating the “-- all”.

 **11. Commit the file or files.**

@@ -96,7 +96,8 @@ If there are conflicts between your edits and those made by others since you sta
 $ git status
 ```

-Open those files one at a time, and you will see lines inserted by Git that identify the conflicts:
+Open those files one at a time and you
+will see lines inserted by Git that identify the conflicts:

 ```
 <<<<<< HEAD
@@ -118,7 +119,7 @@ $ git push myrepo feature-in-progress-branch

 **15. Check to be sure your fork of the Prysm repo contains your feature branch with the latest edits.**

-Navigate to your fork of the repo on GitHub. On the upper left where the current branch is listed, change the branch to your feature-in-progress-branch. Open the files that you have worked on and check to make sure they include your changes.
+Navigate to your fork of the repo on Github. On the upper left where the current branch is listed, change the branch to your feature-in-progress-branch. Open the files that you have worked on and check to make sure they include your changes.

 **16. Create a pull request.**

@@ -150,7 +151,7 @@ pick 	hash 	fix a bug
 pick 	hash 	add a feature
 ```

-Replace the word pick with the word “squash” for every line but the first, so you end with ….
+Replace the word pick with the word “squash” for every line but the first so you end with ….

 ```
 pick    hash	do some work
@@ -177,7 +178,7 @@ We consider two types of contributions to our repo and categorize them as follow
 Anyone can become a part-time contributor and help out on implementing Ethereum consensus. The responsibilities of a part-time contributor include:

 -   Engaging in Gitter conversations, asking the questions on how to begin contributing to the project
-   Opening up GitHub issues to express interest in code to implement
+-   Opening up github issues to express interest in code to implement
 -   Opening up PRs referencing any open issue in the repo. PRs should include:
    -   Detailed context of what would be required for merge
    -   Tests that are consistent with how other tests are written in our implementation
@@ -187,12 +188,12 @@ Anyone can become a part-time contributor and help out on implementing Ethereum

 ### Core Contributors

-Core contributors are remote contractors of Prysmatic Labs, LLC. and are considered critical team members of our organization. Core devs have all the responsibilities of part-time contributors plus the majority of the following:
+Core contributors are remote contractors of Prysmatic Labs, LLC. and are considered critical team members of our organization. Core devs have all of the responsibilities of part-time contributors plus the majority of the following:

 -   Stay up to date on the latest beacon chain specification
-   Monitor GitHub issues and PR’s to make sure owner, labels, descriptions are correct
+-   Monitor github issues and PR’s to make sure owner, labels, descriptions are correct
 -   Formulate independent ideas, suggest new work to do, point out improvements to existing approaches
-   Participate in code review, ensure code quality is excellent, and ensure high code coverage
+-   Participate in code review, ensure code quality is excellent, and have ensure high code coverage
 -   Help with social media presence, write bi-weekly development update
 -   Represent Prysmatic Labs at events to help spread the word on scalability research and solutions

--- a/README.md
+++ b/README.md
@@ -4,14 +4,14 @@
 [![Go Report Card](https://goreportcard.com/badge/github.com/prysmaticlabs/prysm)](https://goreportcard.com/report/github.com/prysmaticlabs/prysm)
 [![Consensus_Spec_Version 1.3.0](https://img.shields.io/badge/Consensus%20Spec%20Version-v1.3.0-blue.svg)](https://github.com/ethereum/consensus-specs/tree/v1.3.0)
 [![Execution_API_Version 1.0.0-beta.2](https://img.shields.io/badge/Execution%20API%20Version-v1.0.0.beta.2-blue.svg)](https://github.com/ethereum/execution-apis/tree/v1.0.0-beta.2/src/engine)
-[![Discord](https://user-images.githubusercontent.com/7288322/34471967-1df7808a-efbb-11e7-9088-ed0b04151291.png)](https://discord.gg/prysmaticlabs)
+[![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)

 This is the core repository for Prysm, a [Golang](https://golang.org/) implementation of the [Ethereum Consensus](https://ethereum.org/en/eth2/) specification, developed by [Prysmatic Labs](https://prysmaticlabs.com). See the [Changelog](https://github.com/prysmaticlabs/prysm/releases) for details of the latest releases and upcoming breaking changes.

 ### Getting Started

-A detailed set of installation and usage instructions as well as breakdowns of each individual component are available in the [official documentation portal](https://docs.prylabs.network). If you still have questions, feel free to stop by our [Discord](https://discord.gg/prysmaticlabs).
+A detailed set of installation and usage instructions as well as breakdowns of each individual component are available in the [official documentation portal](https://docs.prylabs.network). If you still have questions, feel free to stop by our [Discord](https://discord.gg/CTYGPUJ).

 ### Staking on Mainnet

--- a/58
+++ b/58
@@ -16,37 +16,27 @@ load("@rules_pkg//:deps.bzl", "rules_pkg_dependencies")

 rules_pkg_dependencies()

-HERMETIC_CC_TOOLCHAIN_VERSION = "v2.0.0"
-
 http_archive(
-    name = "hermetic_cc_toolchain",
-    sha256 = "57f03a6c29793e8add7bd64186fc8066d23b5ffd06fe9cc6b0b8c499914d3a65",
-    urls = [
-        "https://mirror.bazel.build/github.com/uber/hermetic_cc_toolchain/releases/download/{0}/hermetic_cc_toolchain-{0}.tar.gz".format(HERMETIC_CC_TOOLCHAIN_VERSION),
-        "https://github.com/uber/hermetic_cc_toolchain/releases/download/{0}/hermetic_cc_toolchain-{0}.tar.gz".format(HERMETIC_CC_TOOLCHAIN_VERSION),
-    ],
+    name = "com_grail_bazel_toolchain",
+    sha256 = "b210fc8e58782ef171f428bfc850ed7179bdd805543ebd1aa144b9c93489134f",
+    strip_prefix = "bazel-toolchain-83e69ba9e4b4fdad0d1d057fcb87addf77c281c9",
+    urls = ["https://github.com/grailbio/bazel-toolchain/archive/83e69ba9e4b4fdad0d1d057fcb87addf77c281c9.tar.gz"],
 )

-load("@hermetic_cc_toolchain//toolchain:defs.bzl", zig_toolchains = "toolchains")
+load("@com_grail_bazel_toolchain//toolchain:deps.bzl", "bazel_toolchain_dependencies")

-zig_toolchains()
+bazel_toolchain_dependencies()

-# Register zig sdk toolchains with support for Ubuntu 20.04 (Focal Fossa) which has an EOL date of April, 2025.
-# For ubuntu glibc support, see https://launchpad.net/ubuntu/+source/glibc
-register_toolchains(
-    "@zig_sdk//toolchain:linux_amd64_gnu.2.31",
-    "@zig_sdk//toolchain:linux_arm64_gnu.2.31",
-    # Hermetic cc toolchain is not yet supported on darwin. Sysroot needs to be provided.
-    # See https://github.com/uber/hermetic_cc_toolchain#osx-sysroot
-    #    "@zig_sdk//toolchain:darwin_amd64",
-    #    "@zig_sdk//toolchain:darwin_arm64",
-    # Windows builds are not supported yet.
-    #    "@zig_sdk//toolchain:windows_amd64",
+load("@com_grail_bazel_toolchain//toolchain:rules.bzl", "llvm_toolchain")
+
+llvm_toolchain(
+    name = "llvm_toolchain",
+    llvm_version = "13.0.1",
 )

-load("@prysm//tools/cross-toolchain:darwin_cc_hack.bzl", "configure_nonhermetic_darwin")
+load("@llvm_toolchain//:toolchains.bzl", "llvm_register_toolchains")

-configure_nonhermetic_darwin()
+llvm_register_toolchains()

 load("@prysm//tools/cross-toolchain:prysm_toolchains.bzl", "configure_prysm_toolchains")

@@ -174,7 +164,7 @@ load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_depe
 go_rules_dependencies()

 go_register_toolchains(
-    go_version = "1.20.6",
+    go_version = "1.20.3",
    nogo = "@//:nogo",
 )

@@ -215,7 +205,7 @@ filegroup(
    url = "https://github.com/ethereum/EIPs/archive/5480440fe51742ed23342b68cf106cefd427e39d.tar.gz",
 )

-consensus_spec_version = "v1.4.0-alpha.1"
+consensus_spec_version = "v1.3.0"

 bls_test_version = "v0.1.1"

@@ -231,7 +221,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "1118a663be4a00ba00f0635eb20287157f2b2f993aed64335bfbcd04af424c2b",
+    sha256 = "1c806e04ac5e3779032c06a6009350b3836b6809bb23812993d6ececd7047cf5",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/general.tar.gz" % consensus_spec_version,
 )

@@ -247,7 +237,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "acde6e10940d14f22277eda5b55b65a24623ac88e4c7a2e34134a6069f5eea82",
+    sha256 = "2b42796dc5ccd9f1246032d0c17663e20f70334ff7e00325f0fc3af28cb24186",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/minimal.tar.gz" % consensus_spec_version,
 )

@@ -263,7 +253,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "49c022f3a3478cea849ba8f877a9f7e4c1ded549edddc09993550bbc5bb192e1",
+    sha256 = "231e3371e81ce9acde65d2910ec4580587e74dbbcfcbd9c675e473e022deec8a",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/mainnet.tar.gz" % consensus_spec_version,
 )

@@ -278,7 +268,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "c3e246ff01f6b7b9e9e41939954a6ff89dfca7297415f88781809165fa83267c",
+    sha256 = "219b74d95664ea7e8dfbf31162dfa206b9c0cf45919ea86db5fa0f8902977e3c",
    strip_prefix = "consensus-specs-" + consensus_spec_version[1:],
    url = "https://github.com/ethereum/consensus-specs/archive/refs/tags/%s.tar.gz" % consensus_spec_version,
 )
@@ -321,13 +311,11 @@ http_archive(
    url = "https://github.com/bazelbuild/buildtools/archive/f2aed9ee205d62d45c55cfabbfd26342f8526862.zip",
 )

-http_archive(
+git_repository(
    name = "com_google_protobuf",
-    sha256 = "4e176116949be52b0408dfd24f8925d1eb674a781ae242a75296b17a1c721395",
-    strip_prefix = "protobuf-23.3",
-    urls = [
-        "https://github.com/protocolbuffers/protobuf/archive/v23.3.tar.gz",
-    ],
+    commit = "436bd7880e458532901c58f4d9d1ea23fa7edd52",
+    remote = "https://github.com/protocolbuffers/protobuf",
+    shallow_since = "1617835118 -0700",
 )

 # Group the sources of the library so that CMake rule have access to it
--- a/api/BUILD.bazel
+++ b/api/BUILD.bazel
@@ -1,8 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library")
-
-go_library(
-    name = "go_default_library",
-    srcs = ["headers.go"],
-    importpath = "github.com/prysmaticlabs/prysm/v4/api",
-    visibility = ["//visibility:public"],
-)
--- a/api/client/BUILD.bazel
+++ b/api/client/BUILD.bazel
@@ -1,20 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library", "go_test")
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "client.go",
-        "errors.go",
-        "options.go",
-    ],
-    importpath = "github.com/prysmaticlabs/prysm/v4/api/client",
-    visibility = ["//visibility:public"],
-    deps = ["@com_github_pkg_errors//:go_default_library"],
-)
-
-go_test(
-    name = "go_default_test",
-    srcs = ["client_test.go"],
-    embed = [":go_default_library"],
-    deps = ["//testing/require:go_default_library"],
-)
--- a/api/client/beacon/BUILD.bazel
+++ b/api/client/beacon/BUILD.bazel
@@ -6,11 +6,11 @@ go_library(
        "checkpoint.go",
        "client.go",
        "doc.go",
+        "errors.go",
    ],
    importpath = "github.com/prysmaticlabs/prysm/v4/api/client/beacon",
    visibility = ["//visibility:public"],
    deps = [
-        "//api/client:go_default_library",
        "//beacon-chain/core/helpers:go_default_library",
        "//beacon-chain/rpc/apimiddleware:go_default_library",
        "//beacon-chain/state:go_default_library",
@@ -39,7 +39,6 @@ go_test(
    ],
    embed = [":go_default_library"],
    deps = [
-        "//api/client:go_default_library",
        "//beacon-chain/state:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/blocks:go_default_library",
--- a/api/client/beacon/checkpoint.go
+++ b/api/client/beacon/checkpoint.go
@@ -6,12 +6,10 @@ import (
 	"path"

 	"github.com/pkg/errors"
-	base "github.com/prysmaticlabs/prysm/v4/api/client"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v4/encoding/ssz/detect"
 	"github.com/prysmaticlabs/prysm/v4/io/file"
 	"github.com/prysmaticlabs/prysm/v4/runtime/version"
@@ -20,8 +18,6 @@ import (
 	"golang.org/x/mod/semver"
 )

-var errCheckpointBlockMismatch = errors.New("mismatch between checkpoint sync state and block")
-
 // OriginData represents the BeaconState and ReadOnlySignedBeaconBlock necessary to start an empty Beacon Node
 // using Checkpoint Sync.
 type OriginData struct {
@@ -78,40 +74,37 @@ 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)
+	}

-	slot := s.LatestBlockHeader().Slot
-	bb, err := client.GetBlock(ctx, IdFromSlot(slot))
+	sr, err := s.HashTreeRoot(ctx)
 	if err != nil {
-		return nil, errors.Wrapf(err, "error requesting block by slot = %d", slot)
+		return nil, errors.Wrapf(err, "failed to compute htr for finalized state at slot=%d", s.Slot())
+	}
+	header := s.LatestBlockHeader()
+	header.StateRoot = sr[:]
+	br, err := header.HashTreeRoot()
+	if err != nil {
+		return nil, errors.Wrap(err, "error while computing block root using state data")
+	}
+
+	bb, err := client.GetBlock(ctx, IdFromRoot(br))
+	if err != nil {
+		return nil, errors.Wrapf(err, "error requesting block by root = %#x", br)
 	}
 	b, err := vu.UnmarshalBeaconBlock(bb)
 	if err != nil {
 		return nil, errors.Wrap(err, "unable to unmarshal block to a supported type using the detected fork schedule")
 	}
-	br, err := b.Block().HashTreeRoot()
+	realBlockRoot, err := b.Block().HashTreeRoot()
 	if err != nil {
 		return nil, errors.Wrap(err, "error computing hash_tree_root of retrieved block")
 	}
-	bodyRoot, err := b.Block().Body().HashTreeRoot()
-	if err != nil {
-		return nil, errors.Wrap(err, "error computing hash_tree_root of retrieved block body")
-	}

-	sbr := bytesutil.ToBytes32(s.LatestBlockHeader().BodyRoot)
-	if sbr != bodyRoot {
-		return nil, errors.Wrapf(errCheckpointBlockMismatch, "state body root = %#x, block body root = %#x", sbr, bodyRoot)
-	}
-	sr, err := s.HashTreeRoot(ctx)
-	if err != nil {
-		return nil, errors.Wrapf(err, "failed to compute htr for finalized state at slot=%d", s.Slot())
-	}
-
-	log.
-		WithField("block_slot", b.Block().Slot()).
-		WithField("state_slot", s.Slot()).
-		WithField("state_root", sr).
-		WithField("block_root", br).
-		Info("Downloaded checkpoint sync state and block.")
+	log.Printf("BeaconState slot=%d, Block slot=%d", s.Slot(), b.Block().Slot())
+	log.Printf("BeaconState htr=%#x, Block state_root=%#x", sr, b.Block().StateRoot())
+	log.Printf("BeaconState latest_block_header htr=%#x, block htr=%#x", br, realBlockRoot)
 	return &OriginData{
 		st: s,
 		b:  b,
@@ -147,7 +140,7 @@ func ComputeWeakSubjectivityCheckpoint(ctx context.Context, client *Client) (*We
 	ws, err := client.GetWeakSubjectivity(ctx)
 	if err != nil {
 		// a 404/405 is expected if querying an endpoint that doesn't support the weak subjectivity checkpoint api
-		if !errors.Is(err, base.ErrNotOK) {
+		if !errors.Is(err, ErrNotOK) {
 			return nil, errors.Wrap(err, "unexpected API response for prysm-only weak subjectivity checkpoint API")
 		}
 		// fall back to vanilla Beacon Node API method
--- a/api/client/beacon/checkpoint_test.go
+++ b/api/client/beacon/checkpoint_test.go
@@ -7,9 +7,9 @@ import (
 	"fmt"
 	"io"
 	"net/http"
+	"net/url"
 	"testing"

-	"github.com/prysmaticlabs/prysm/v4/api/client"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
 	blocktest "github.com/prysmaticlabs/prysm/v4/consensus-types/blocks/testing"
@@ -66,7 +66,11 @@ func TestMarshalToEnvelope(t *testing.T) {
 }

 func TestFallbackVersionCheck(t *testing.T) {
-	trans := &testRT{rt: func(req *http.Request) (*http.Response, error) {
+	c := &Client{
+		hc:      &http.Client{},
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}
+	c.hc.Transport = &testRT{rt: func(req *http.Request) (*http.Response, error) {
 		res := &http.Response{Request: req}
 		switch req.URL.Path {
 		case getNodeVersionPath:
@@ -84,13 +88,12 @@ func TestFallbackVersionCheck(t *testing.T) {
 		case getWeakSubjectivityPath:
 			res.StatusCode = http.StatusNotFound
 		}
+
 		return res, nil
 	}}

-	c, err := NewClient("http://localhost:3500", client.WithRoundTripper(trans))
-	require.NoError(t, err)
 	ctx := context.Background()
-	_, err = ComputeWeakSubjectivityCheckpoint(ctx, c)
+	_, err := ComputeWeakSubjectivityCheckpoint(ctx, c)
 	require.ErrorIs(t, err, errUnsupportedPrysmCheckpointVersion)
 }

@@ -128,7 +131,6 @@ func TestDownloadWeakSubjectivityCheckpoint(t *testing.T) {
 	wst, err := util.NewBeaconState()
 	require.NoError(t, err)
 	fork, err := forkForEpoch(cfg, epoch)
-	require.NoError(t, err)
 	require.NoError(t, wst.SetFork(fork))

 	// set up checkpoint block
@@ -168,41 +170,44 @@ func TestDownloadWeakSubjectivityCheckpoint(t *testing.T) {
 		Epoch:     epoch,
 	}

-	trans := &testRT{rt: func(req *http.Request) (*http.Response, error) {
-		res := &http.Response{Request: req}
-		switch req.URL.Path {
-		case getWeakSubjectivityPath:
-			res.StatusCode = http.StatusOK
-			cp := struct {
-				Epoch string `json:"epoch"`
-				Root  string `json:"root"`
-			}{
-				Epoch: fmt.Sprintf("%d", slots.ToEpoch(b.Block().Slot())),
-				Root:  fmt.Sprintf("%#x", bRoot),
+	hc := &http.Client{
+		Transport: &testRT{rt: func(req *http.Request) (*http.Response, error) {
+			res := &http.Response{Request: req}
+			switch req.URL.Path {
+			case getWeakSubjectivityPath:
+				res.StatusCode = http.StatusOK
+				cp := struct {
+					Epoch string `json:"epoch"`
+					Root  string `json:"root"`
+				}{
+					Epoch: fmt.Sprintf("%d", slots.ToEpoch(b.Block().Slot())),
+					Root:  fmt.Sprintf("%#x", bRoot),
+				}
+				wsr := struct {
+					Checkpoint interface{} `json:"ws_checkpoint"`
+					StateRoot  string      `json:"state_root"`
+				}{
+					Checkpoint: cp,
+					StateRoot:  fmt.Sprintf("%#x", wRoot),
+				}
+				rb, err := marshalToEnvelope(wsr)
+				require.NoError(t, err)
+				res.Body = io.NopCloser(bytes.NewBuffer(rb))
+			case renderGetStatePath(IdFromSlot(wSlot)):
+				res.StatusCode = http.StatusOK
+				res.Body = io.NopCloser(bytes.NewBuffer(wsSerialized))
+			case renderGetBlockPath(IdFromRoot(bRoot)):
+				res.StatusCode = http.StatusOK
+				res.Body = io.NopCloser(bytes.NewBuffer(serBlock))
 			}
-			wsr := struct {
-				Checkpoint interface{} `json:"ws_checkpoint"`
-				StateRoot  string      `json:"state_root"`
-			}{
-				Checkpoint: cp,
-				StateRoot:  fmt.Sprintf("%#x", wRoot),
-			}
-			rb, err := marshalToEnvelope(wsr)
-			require.NoError(t, err)
-			res.Body = io.NopCloser(bytes.NewBuffer(rb))
-		case renderGetStatePath(IdFromSlot(wSlot)):
-			res.StatusCode = http.StatusOK
-			res.Body = io.NopCloser(bytes.NewBuffer(wsSerialized))
-		case renderGetBlockPath(IdFromRoot(bRoot)):
-			res.StatusCode = http.StatusOK
-			res.Body = io.NopCloser(bytes.NewBuffer(serBlock))
-		}

-		return res, nil
-	}}
-
-	c, err := NewClient("http://localhost:3500", client.WithRoundTripper(trans))
-	require.NoError(t, err)
+			return res, nil
+		}},
+	}
+	c := &Client{
+		hc:      hc,
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}

 	wsd, err := ComputeWeakSubjectivityCheckpoint(ctx, c)
 	require.NoError(t, err)
@@ -227,7 +232,6 @@ func TestDownloadBackwardsCompatibleCombined(t *testing.T) {
 	wst, err := util.NewBeaconState()
 	require.NoError(t, err)
 	fork, err := forkForEpoch(cfg, cfg.GenesisEpoch)
-	require.NoError(t, err)
 	require.NoError(t, wst.SetFork(fork))

 	// set up checkpoint block
@@ -262,39 +266,42 @@ func TestDownloadBackwardsCompatibleCombined(t *testing.T) {
 	wsSerialized, err := wst.MarshalSSZ()
 	require.NoError(t, err)

-	trans := &testRT{rt: func(req *http.Request) (*http.Response, error) {
-		res := &http.Response{Request: req}
-		switch req.URL.Path {
-		case getNodeVersionPath:
-			res.StatusCode = http.StatusOK
-			b := bytes.NewBuffer(nil)
-			d := struct {
-				Version string `json:"version"`
-			}{
-				Version: "Lighthouse/v0.1.5 (Linux x86_64)",
+	hc := &http.Client{
+		Transport: &testRT{rt: func(req *http.Request) (*http.Response, error) {
+			res := &http.Response{Request: req}
+			switch req.URL.Path {
+			case getNodeVersionPath:
+				res.StatusCode = http.StatusOK
+				b := bytes.NewBuffer(nil)
+				d := struct {
+					Version string `json:"version"`
+				}{
+					Version: "Lighthouse/v0.1.5 (Linux x86_64)",
+				}
+				encoded, err := marshalToEnvelope(d)
+				require.NoError(t, err)
+				b.Write(encoded)
+				res.Body = io.NopCloser(b)
+			case getWeakSubjectivityPath:
+				res.StatusCode = http.StatusNotFound
+			case renderGetStatePath(IdHead):
+				res.StatusCode = http.StatusOK
+				res.Body = io.NopCloser(bytes.NewBuffer(serialized))
+			case renderGetStatePath(IdFromSlot(wSlot)):
+				res.StatusCode = http.StatusOK
+				res.Body = io.NopCloser(bytes.NewBuffer(wsSerialized))
+			case renderGetBlockPath(IdFromRoot(bRoot)):
+				res.StatusCode = http.StatusOK
+				res.Body = io.NopCloser(bytes.NewBuffer(serBlock))
 			}
-			encoded, err := marshalToEnvelope(d)
-			require.NoError(t, err)
-			b.Write(encoded)
-			res.Body = io.NopCloser(b)
-		case getWeakSubjectivityPath:
-			res.StatusCode = http.StatusNotFound
-		case renderGetStatePath(IdHead):
-			res.StatusCode = http.StatusOK
-			res.Body = io.NopCloser(bytes.NewBuffer(serialized))
-		case renderGetStatePath(IdFromSlot(wSlot)):
-			res.StatusCode = http.StatusOK
-			res.Body = io.NopCloser(bytes.NewBuffer(wsSerialized))
-		case renderGetBlockPath(IdFromRoot(bRoot)):
-			res.StatusCode = http.StatusOK
-			res.Body = io.NopCloser(bytes.NewBuffer(serBlock))
-		}

-		return res, nil
-	}}
-
-	c, err := NewClient("http://localhost:3500", client.WithRoundTripper(trans))
-	require.NoError(t, err)
+			return res, nil
+		}},
+	}
+	c := &Client{
+		hc:      hc,
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}

 	wsPub, err := ComputeWeakSubjectivityCheckpoint(ctx, c)
 	require.NoError(t, err)
@@ -308,16 +315,21 @@ func TestGetWeakSubjectivityEpochFromHead(t *testing.T) {
 	st, expectedEpoch := defaultTestHeadState(t, params.MainnetConfig())
 	serialized, err := st.MarshalSSZ()
 	require.NoError(t, err)
-	trans := &testRT{rt: func(req *http.Request) (*http.Response, error) {
-		res := &http.Response{Request: req}
-		if req.URL.Path == renderGetStatePath(IdHead) {
-			res.StatusCode = http.StatusOK
-			res.Body = io.NopCloser(bytes.NewBuffer(serialized))
-		}
-		return res, nil
-	}}
-	c, err := NewClient("http://localhost:3500", client.WithRoundTripper(trans))
-	require.NoError(t, err)
+	hc := &http.Client{
+		Transport: &testRT{rt: func(req *http.Request) (*http.Response, error) {
+			res := &http.Response{Request: req}
+			switch req.URL.Path {
+			case renderGetStatePath(IdHead):
+				res.StatusCode = http.StatusOK
+				res.Body = io.NopCloser(bytes.NewBuffer(serialized))
+			}
+			return res, nil
+		}},
+	}
+	c := &Client{
+		hc:      hc,
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}
 	actualEpoch, err := getWeakSubjectivityEpochFromHead(context.Background(), c)
 	require.NoError(t, err)
 	require.Equal(t, expectedEpoch, actualEpoch)
@@ -401,7 +413,6 @@ func TestDownloadFinalizedData(t *testing.T) {
 	st, err := util.NewBeaconState()
 	require.NoError(t, err)
 	fork, err := forkForEpoch(cfg, epoch)
-	require.NoError(t, err)
 	require.NoError(t, st.SetFork(fork))
 	require.NoError(t, st.SetSlot(slot))

@@ -437,24 +448,29 @@ func TestDownloadFinalizedData(t *testing.T) {
 	ms, err := st.MarshalSSZ()
 	require.NoError(t, err)

-	trans := &testRT{rt: func(req *http.Request) (*http.Response, error) {
-		res := &http.Response{Request: req}
-		switch req.URL.Path {
-		case renderGetStatePath(IdFinalized):
-			res.StatusCode = http.StatusOK
-			res.Body = io.NopCloser(bytes.NewBuffer(ms))
-		case renderGetBlockPath(IdFromSlot(b.Block().Slot())):
-			res.StatusCode = http.StatusOK
-			res.Body = io.NopCloser(bytes.NewBuffer(mb))
-		default:
-			res.StatusCode = http.StatusInternalServerError
-			res.Body = io.NopCloser(bytes.NewBufferString(""))
-		}
+	hc := &http.Client{
+		Transport: &testRT{rt: func(req *http.Request) (*http.Response, error) {
+			res := &http.Response{Request: req}
+			switch req.URL.Path {
+			case renderGetStatePath(IdFinalized):
+				res.StatusCode = http.StatusOK
+				res.Body = io.NopCloser(bytes.NewBuffer(ms))
+			case renderGetBlockPath(IdFromRoot(br)):
+				res.StatusCode = http.StatusOK
+				res.Body = io.NopCloser(bytes.NewBuffer(mb))
+			default:
+				res.StatusCode = http.StatusInternalServerError
+				res.Body = io.NopCloser(bytes.NewBufferString(""))
+			}
+
+			return res, nil
+		}},
+	}
+	c := &Client{
+		hc:      hc,
+		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+	}

-		return res, nil
-	}}
-	c, err := NewClient("http://localhost:3500", client.WithRoundTripper(trans))
-	require.NoError(t, err)
 	// sanity check before we go through checkpoint
 	// make sure we can download the state and unmarshal it with the VersionedUnmarshaler
 	sb, err := c.GetState(ctx, IdFinalized)
--- a/api/client/beacon/client.go
+++ b/api/client/beacon/client.go
@@ -5,6 +5,8 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
+	"io"
+	"net"
 	"net/http"
 	"net/url"
 	"path"
@@ -12,8 +14,8 @@ import (
 	"sort"
 	"strconv"
 	"text/template"
+	"time"

-	"github.com/prysmaticlabs/prysm/v4/api/client"
 	"github.com/prysmaticlabs/prysm/v4/network/forks"
 	v1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"

@@ -52,6 +54,8 @@ const (
 	IdFinalized StateOrBlockId = "finalized"
 )

+var ErrMalformedHostname = errors.New("hostname must include port, separated by one colon, like example.com:3500")
+
 // IdFromRoot encodes a block root in the format expected by the API in places where a root can be used to identify
 // a BeaconState or SignedBeaconBlock.
 func IdFromRoot(r [32]byte) StateOrBlockId {
@@ -81,22 +85,96 @@ func idTemplate(ts string) func(StateOrBlockId) string {
 	return f
 }

-func renderGetBlockPath(id StateOrBlockId) string {
-	return path.Join(getSignedBlockPath, string(id))
+// 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
+	}
 }

 // Client provides a collection of helper methods for calling the Eth Beacon Node API endpoints.
 type Client struct {
-	*client.Client
+	hc      *http.Client
+	baseURL *url.URL
 }

-// NewClient returns a new Client that includes functions for rest calls to Beacon API.
-func NewClient(host string, opts ...client.ClientOpt) (*Client, error) {
-	c, err := client.NewClient(host, opts...)
+// NewClient constructs a new client with the provided options (ex WithTimeout).
+// `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) {
+	u, err := urlForHost(host)
 	if err != nil {
 		return nil, err
 	}
-	return &Client{c}, nil
+	c := &Client{
+		hc:      &http.Client{},
+		baseURL: u,
+	}
+	for _, o := range opts {
+		o(c)
+	}
+	return c, nil
+}
+
+func urlForHost(h string) (*url.URL, error) {
+	// try to parse as url (being permissive)
+	u, err := url.Parse(h)
+	if err == nil && u.Host != "" {
+		return u, nil
+	}
+	// try to parse as host:port
+	host, port, err := net.SplitHostPort(h)
+	if err != nil {
+		return nil, ErrMalformedHostname
+	}
+	return &url.URL{Host: fmt.Sprintf("%s:%s", host, port), Scheme: "http"}, nil
+}
+
+// NodeURL returns a human-readable string representation of the beacon node base url.
+func (c *Client) NodeURL() string {
+	return c.baseURL.String()
+}
+
+type reqOption func(*http.Request)
+
+func withSSZEncoding() reqOption {
+	return func(req *http.Request) {
+		req.Header.Set("Accept", "application/octet-stream")
+	}
+}
+
+// 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})
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+	for _, o := range opts {
+		o(req)
+	}
+	r, err := c.hc.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer func() {
+		err = r.Body.Close()
+	}()
+	if r.StatusCode != http.StatusOK {
+		return nil, non200Err(r)
+	}
+	b, err := io.ReadAll(r.Body)
+	if err != nil {
+		return nil, errors.Wrap(err, "error reading http response body from GetBlock")
+	}
+	return b, nil
+}
+
+func renderGetBlockPath(id StateOrBlockId) string {
+	return path.Join(getSignedBlockPath, string(id))
 }

 // GetBlock retrieves the SignedBeaconBlock for the given block id.
@@ -106,7 +184,7 @@ func NewClient(host string, opts ...client.ClientOpt) (*Client, error) {
 // The return value contains the ssz-encoded bytes.
 func (c *Client) GetBlock(ctx context.Context, blockId StateOrBlockId) ([]byte, error) {
 	blockPath := renderGetBlockPath(blockId)
-	b, err := c.Get(ctx, blockPath, client.WithSSZEncoding())
+	b, err := c.get(ctx, blockPath, withSSZEncoding())
 	if err != nil {
 		return nil, errors.Wrapf(err, "error requesting state by id = %s", blockId)
 	}
@@ -121,7 +199,7 @@ var getBlockRootTpl = idTemplate(getBlockRootPath)
 // for the named identifiers.
 func (c *Client) GetBlockRoot(ctx context.Context, blockId StateOrBlockId) ([32]byte, error) {
 	rootPath := getBlockRootTpl(blockId)
-	b, err := c.Get(ctx, rootPath)
+	b, err := c.get(ctx, rootPath)
 	if err != nil {
 		return [32]byte{}, errors.Wrapf(err, "error requesting block root by id = %s", blockId)
 	}
@@ -144,7 +222,7 @@ var getForkTpl = idTemplate(getForkForStatePath)
 // <slot>, <hex encoded blockRoot with 0x prefix>. Variables of type StateOrBlockId are exported by this package
 // for the named identifiers.
 func (c *Client) GetFork(ctx context.Context, stateId StateOrBlockId) (*ethpb.Fork, error) {
-	body, err := c.Get(ctx, getForkTpl(stateId))
+	body, err := c.get(ctx, getForkTpl(stateId))
 	if err != nil {
 		return nil, errors.Wrapf(err, "error requesting fork by state id = %s", stateId)
 	}
@@ -160,7 +238,7 @@ func (c *Client) GetFork(ctx context.Context, stateId StateOrBlockId) (*ethpb.Fo

 // GetForkSchedule retrieve all forks, past present and future, of which this node is aware.
 func (c *Client) GetForkSchedule(ctx context.Context) (forks.OrderedSchedule, error) {
-	body, err := c.Get(ctx, getForkSchedulePath)
+	body, err := c.get(ctx, getForkSchedulePath)
 	if err != nil {
 		return nil, errors.Wrap(err, "error requesting fork schedule")
 	}
@@ -178,7 +256,7 @@ func (c *Client) GetForkSchedule(ctx context.Context) (forks.OrderedSchedule, er

 // GetConfigSpec retrieve the current configs of the network used by the beacon node.
 func (c *Client) GetConfigSpec(ctx context.Context) (*v1.SpecResponse, error) {
-	body, err := c.Get(ctx, getConfigSpecPath)
+	body, err := c.get(ctx, getConfigSpecPath)
 	if err != nil {
 		return nil, errors.Wrap(err, "error requesting configSpecPath")
 	}
@@ -201,7 +279,7 @@ var versionRE = regexp.MustCompile(`^(\w+)/(v\d+\.\d+\.\d+[-a-zA-Z0-9]*)\s*/?(.*
 func parseNodeVersion(v string) (*NodeVersion, error) {
 	groups := versionRE.FindStringSubmatch(v)
 	if len(groups) != 4 {
-		return nil, errors.Wrapf(client.ErrInvalidNodeVersion, "could not be parsed: %s", v)
+		return nil, errors.Wrapf(ErrInvalidNodeVersion, "could not be parsed: %s", v)
 	}
 	return &NodeVersion{
 		implementation: groups[1],
@@ -213,7 +291,7 @@ func parseNodeVersion(v string) (*NodeVersion, error) {
 // GetNodeVersion requests that the beacon node identify information about its implementation in a format
 // similar to a HTTP User-Agent field. ex: Lighthouse/v0.1.5 (Linux x86_64)
 func (c *Client) GetNodeVersion(ctx context.Context) (*NodeVersion, error) {
-	b, err := c.Get(ctx, getNodeVersionPath)
+	b, err := c.get(ctx, getNodeVersionPath)
 	if err != nil {
 		return nil, errors.Wrap(err, "error requesting node version")
 	}
@@ -240,7 +318,7 @@ func renderGetStatePath(id StateOrBlockId) string {
 // The return value contains the ssz-encoded bytes.
 func (c *Client) GetState(ctx context.Context, stateId StateOrBlockId) ([]byte, error) {
 	statePath := path.Join(getStatePath, string(stateId))
-	b, err := c.Get(ctx, statePath, client.WithSSZEncoding())
+	b, err := c.get(ctx, statePath, withSSZEncoding())
 	if err != nil {
 		return nil, errors.Wrapf(err, "error requesting state by id = %s", stateId)
 	}
@@ -253,7 +331,7 @@ func (c *Client) GetState(ctx context.Context, stateId StateOrBlockId) ([]byte,
 // - finds the highest non-skipped block preceding the epoch
 // - returns the htr of the found block and returns this + the value of state_root from the block
 func (c *Client) GetWeakSubjectivity(ctx context.Context) (*WeakSubjectivityData, error) {
-	body, err := c.Get(ctx, getWeakSubjectivityPath)
+	body, err := c.get(ctx, getWeakSubjectivityPath)
 	if err != nil {
 		return nil, err
 	}
@@ -284,7 +362,7 @@ func (c *Client) GetWeakSubjectivity(ctx context.Context) (*WeakSubjectivityData
 // 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})
+	u := c.baseURL.ResolveReference(&url.URL{Path: changeBLStoExecutionPath})
 	body, err := json.Marshal(request)
 	if err != nil {
 		return errors.Wrap(err, "failed to marshal JSON")
@@ -294,7 +372,7 @@ func (c *Client) SubmitChangeBLStoExecution(ctx context.Context, request []*apim
 		return errors.Wrap(err, "invalid format, failed to create new POST request object")
 	}
 	req.Header.Set("Content-Type", "application/json")
-	resp, err := c.Do(req)
+	resp, err := c.hc.Do(req)
 	if err != nil {
 		return err
 	}
@@ -323,7 +401,7 @@ func (c *Client) SubmitChangeBLStoExecution(ctx context.Context, request []*apim
 // 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)
+	body, err := c.get(ctx, changeBLStoExecutionPath)
 	if err != nil {
 		return nil, err
 	}
@@ -335,6 +413,23 @@ func (c *Client) GetBLStoExecutionChanges(ctx context.Context) (*apimiddleware.B
 	return poolResponse, nil
 }

+func non200Err(response *http.Response) error {
+	bodyBytes, err := io.ReadAll(response.Body)
+	var body string
+	if err != nil {
+		body = "(Unable to read response body.)"
+	} else {
+		body = "response body:\n" + string(bodyBytes)
+	}
+	msg := fmt.Sprintf("code=%d, url=%s, body=%s", response.StatusCode, response.Request.URL, body)
+	switch response.StatusCode {
+	case 404:
+		return errors.Wrap(ErrNotFound, msg)
+	default:
+		return errors.Wrap(ErrNotOK, msg)
+	}
+}
+
 type forkResponse struct {
 	PreviousVersion string `json:"previous_version"`
 	CurrentVersion  string `json:"current_version"`
--- a/api/client/beacon/client_test.go
+++ b/api/client/beacon/client_test.go
@@ -4,7 +4,6 @@ import (
 	"net/url"
 	"testing"

-	"github.com/prysmaticlabs/prysm/v4/api/client"
 	"github.com/prysmaticlabs/prysm/v4/testing/require"
 )

@@ -18,17 +17,17 @@ func TestParseNodeVersion(t *testing.T) {
 		{
 			name: "empty string",
 			v:    "",
-			err:  client.ErrInvalidNodeVersion,
+			err:  ErrInvalidNodeVersion,
 		},
 		{
 			name: "Prysm as the version string",
 			v:    "Prysm",
-			err:  client.ErrInvalidNodeVersion,
+			err:  ErrInvalidNodeVersion,
 		},
 		{
 			name: "semver only",
 			v:    "v2.0.6",
-			err:  client.ErrInvalidNodeVersion,
+			err:  ErrInvalidNodeVersion,
 		},
 		{
 			name: "complete version",
@@ -92,7 +91,7 @@ func TestValidHostname(t *testing.T) {
 		{
 			name:    "hostname without port",
 			hostArg: "mydomain.org",
-			err:     client.ErrMalformedHostname,
+			err:     ErrMalformedHostname,
 		},
 		{
 			name:    "hostname with port",
@@ -133,7 +132,7 @@ func TestValidHostname(t *testing.T) {
 				return
 			}
 			require.NoError(t, err)
-			require.Equal(t, c.joined, cl.BaseURL().ResolveReference(&url.URL{Path: c.path}).String())
+			require.Equal(t, c.joined, cl.baseURL.ResolveReference(&url.URL{Path: c.path}).String())
 		})
 	}
 }
--- a/api/client/beacon/errors.go
+++ b/api/client/beacon/errors.go
@@ -0,0 +1,13 @@
+package beacon
+
+import "github.com/pkg/errors"
+
+// ErrNotOK is used to indicate when an HTTP request to the Beacon Node API failed with any non-2xx response code.
+// More specific errors may be returned, but an error in reaction to a non-2xx response will always wrap ErrNotOK.
+var ErrNotOK = errors.New("did not receive 2xx response from API")
+
+// ErrNotFound specifically means that a '404 - NOT FOUND' response was received from the API.
+var ErrNotFound = errors.Wrap(ErrNotOK, "recv 404 NotFound response from API")
+
+// ErrInvalidNodeVersion indicates that the /eth/v1/node/version api response format was not recognized.
+var ErrInvalidNodeVersion = errors.New("invalid node version response")
--- a/api/client/builder/bid.go
+++ b/api/client/builder/bid.go
@@ -3,6 +3,7 @@ package builder
 import (
 	"math/big"

+	"github.com/pkg/errors"
 	ssz "github.com/prysmaticlabs/fastssz"
 	consensus_types "github.com/prysmaticlabs/prysm/v4/consensus-types"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
@@ -161,6 +162,9 @@ func WrappedBuilderBidCapella(p *ethpb.BuilderBidCapella) (Bid, error) {

 // Header returns the execution data interface.
 func (b builderBidCapella) Header() (interfaces.ExecutionData, error) {
+	if b.p == nil {
+		return nil, errors.New("builder bid is nil")
+	}
 	// We have to convert big endian to little endian because the value is coming from the execution layer.
 	v := big.NewInt(0).SetBytes(bytesutil.ReverseByteOrder(b.p.Value))
 	return blocks.WrappedExecutionPayloadHeaderCapella(b.p.Header, math.WeiToGwei(v))
--- a/api/client/builder/client.go
+++ b/api/client/builder/client.go
@@ -11,6 +11,7 @@ import (
 	"net/url"
 	"strings"
 	"text/template"
+	"time"

 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
@@ -35,6 +36,7 @@ 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)
@@ -290,6 +292,8 @@ func (c *Client) SubmitBlindedBlock(ctx context.Context, sb interfaces.ReadOnlyS
 			return nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockBellatrix value body in SubmitBlindedBlock")
 		}

+		ctx, cancel := context.WithTimeout(ctx, submitBlindedBlockTimeout)
+		defer cancel()
 		versionOpt := func(r *http.Request) {
 			r.Header.Add("Eth-Consensus-Version", version.String(version.Bellatrix))
 		}
@@ -321,6 +325,8 @@ func (c *Client) SubmitBlindedBlock(ctx context.Context, sb interfaces.ReadOnlyS
 			return nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockCapella value body in SubmitBlindedBlockCapella")
 		}

+		ctx, cancel := context.WithTimeout(ctx, submitBlindedBlockTimeout)
+		defer cancel()
 		versionOpt := func(r *http.Request) {
 			r.Header.Add("Eth-Consensus-Version", version.String(version.Capella))
 		}
--- a/api/client/builder/types.go
+++ b/api/client/builder/types.go
@@ -14,17 +14,14 @@ import (
 	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 )

-// SignedValidatorRegistration a struct for signed validator registrations.
 type SignedValidatorRegistration struct {
 	*eth.SignedValidatorRegistrationV1
 }

-// ValidatorRegistration a struct for validator registrations.
 type ValidatorRegistration struct {
 	*eth.ValidatorRegistrationV1
 }

-// MarshalJSON returns a json representation copy of signed validator registration.
 func (r *SignedValidatorRegistration) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Message   *ValidatorRegistration `json:"message"`
@@ -35,7 +32,6 @@ func (r *SignedValidatorRegistration) MarshalJSON() ([]byte, error) {
 	})
 }

-// UnmarshalJSON returns a byte representation of signed validator registration from json.
 func (r *SignedValidatorRegistration) UnmarshalJSON(b []byte) error {
 	if r.SignedValidatorRegistrationV1 == nil {
 		r.SignedValidatorRegistrationV1 = &eth.SignedValidatorRegistrationV1{}
@@ -52,7 +48,6 @@ func (r *SignedValidatorRegistration) UnmarshalJSON(b []byte) error {
 	return nil
 }

-// MarshalJSON returns a json representation copy of validator registration.
 func (r *ValidatorRegistration) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		FeeRecipient hexutil.Bytes `json:"fee_recipient"`
@@ -67,7 +62,6 @@ func (r *ValidatorRegistration) MarshalJSON() ([]byte, error) {
 	})
 }

-// UnmarshalJSON returns a byte representation of validator registration from json.
 func (r *ValidatorRegistration) UnmarshalJSON(b []byte) error {
 	if r.ValidatorRegistrationV1 == nil {
 		r.ValidatorRegistrationV1 = &eth.ValidatorRegistrationV1{}
@@ -98,7 +92,6 @@ func (r *ValidatorRegistration) UnmarshalJSON(b []byte) error {
 var errInvalidUint256 = errors.New("invalid Uint256")
 var errDecodeUint256 = errors.New("unable to decode into Uint256")

-// Uint256 a wrapper representation of big.Int
 type Uint256 struct {
 	*big.Int
 }
@@ -125,7 +118,7 @@ func sszBytesToUint256(b []byte) (Uint256, error) {
 	return Uint256{Int: bi}, nil
 }

-// SSZBytes creates an ssz-style (little-endian byte slice) representation of the Uint256.
+// SSZBytes creates an ssz-style (little-endian byte slice) representation of the Uint256
 func (s Uint256) SSZBytes() []byte {
 	if !isValidUint256(s.Int) {
 		return []byte{}
@@ -133,19 +126,18 @@ func (s Uint256) SSZBytes() []byte {
 	return bytesutil.PadTo(bytesutil.ReverseByteOrder(s.Int.Bytes()), 32)
 }

-// UnmarshalJSON takes in a byte array and unmarshals the value in Uint256
 func (s *Uint256) UnmarshalJSON(t []byte) error {
+	start := 0
 	end := len(t)
-	if len(t) < 2 {
-		return errors.Errorf("provided Uint256 json string is too short: %s", string(t))
+	if t[0] == '"' {
+		start += 1
 	}
-	if t[0] != '"' || t[end-1] != '"' {
-		return errors.Errorf("provided Uint256 json string is malformed: %s", string(t))
+	if t[end-1] == '"' {
+		end -= 1
 	}
-	return s.UnmarshalText(t[1 : end-1])
+	return s.UnmarshalText(t[start:end])
 }

-// UnmarshalText takes in a byte array and unmarshals the text in Uint256
 func (s *Uint256) UnmarshalText(t []byte) error {
 	if s.Int == nil {
 		s.Int = big.NewInt(0)
@@ -161,7 +153,6 @@ func (s *Uint256) UnmarshalText(t []byte) error {
 	return nil
 }

-// MarshalJSON returns a json byte representation of Uint256.
 func (s Uint256) MarshalJSON() ([]byte, error) {
 	t, err := s.MarshalText()
 	if err != nil {
@@ -172,7 +163,6 @@ func (s Uint256) MarshalJSON() ([]byte, error) {
 	return t, nil
 }

-// MarshalText returns a text byte representation of Uint256.
 func (s Uint256) MarshalText() ([]byte, error) {
 	if !isValidUint256(s.Int) {
 		return nil, errors.Wrapf(errInvalidUint256, "value=%s", s.Int)
@@ -180,27 +170,22 @@ func (s Uint256) MarshalText() ([]byte, error) {
 	return []byte(s.String()), nil
 }

-// Uint64String is a custom type that allows marshalling from text to uint64 and vice versa.
 type Uint64String uint64

-// UnmarshalText takes a byte array and unmarshals the text in Uint64String.
 func (s *Uint64String) UnmarshalText(t []byte) error {
 	u, err := strconv.ParseUint(string(t), 10, 64)
 	*s = Uint64String(u)
 	return err
 }

-// MarshalText returns a byte representation of the text from Uint64String.
 func (s Uint64String) MarshalText() ([]byte, error) {
 	return []byte(fmt.Sprintf("%d", s)), nil
 }

-// VersionResponse is a JSON representation of a field in the builder API header response.
 type VersionResponse struct {
 	Version string `json:"version"`
 }

-// ExecHeaderResponse is a JSON representation of  the builder API header response for Bellatrix.
 type ExecHeaderResponse struct {
 	Version string `json:"version"`
 	Data    struct {
@@ -209,7 +194,6 @@ type ExecHeaderResponse struct {
 	} `json:"data"`
 }

-// ToProto returns a SignedBuilderBid from ExecHeaderResponse for Bellatrix.
 func (ehr *ExecHeaderResponse) ToProto() (*eth.SignedBuilderBid, error) {
 	bb, err := ehr.Data.Message.ToProto()
 	if err != nil {
@@ -221,7 +205,6 @@ func (ehr *ExecHeaderResponse) ToProto() (*eth.SignedBuilderBid, error) {
 	}, nil
 }

-// ToProto returns a BuilderBid Proto for Bellatrix.
 func (bb *BuilderBid) ToProto() (*eth.BuilderBid, error) {
 	header, err := bb.Header.ToProto()
 	if err != nil {
@@ -234,34 +217,31 @@ func (bb *BuilderBid) ToProto() (*eth.BuilderBid, error) {
 	}, nil
 }

-// ToProto returns a ExecutionPayloadHeader for Bellatrix.
 func (h *ExecutionPayloadHeader) ToProto() (*v1.ExecutionPayloadHeader, error) {
 	return &v1.ExecutionPayloadHeader{
-		ParentHash:       bytesutil.SafeCopyBytes(h.ParentHash),
-		FeeRecipient:     bytesutil.SafeCopyBytes(h.FeeRecipient),
-		StateRoot:        bytesutil.SafeCopyBytes(h.StateRoot),
-		ReceiptsRoot:     bytesutil.SafeCopyBytes(h.ReceiptsRoot),
-		LogsBloom:        bytesutil.SafeCopyBytes(h.LogsBloom),
-		PrevRandao:       bytesutil.SafeCopyBytes(h.PrevRandao),
+		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:        bytesutil.SafeCopyBytes(h.ExtraData),
-		BaseFeePerGas:    bytesutil.SafeCopyBytes(h.BaseFeePerGas.SSZBytes()),
-		BlockHash:        bytesutil.SafeCopyBytes(h.BlockHash),
-		TransactionsRoot: bytesutil.SafeCopyBytes(h.TransactionsRoot),
+		ExtraData:        h.ExtraData,
+		BaseFeePerGas:    h.BaseFeePerGas.SSZBytes(),
+		BlockHash:        h.BlockHash,
+		TransactionsRoot: h.TransactionsRoot,
 	}, nil
 }

-// BuilderBid is part of ExecHeaderResponse for Bellatrix.
 type BuilderBid struct {
 	Header *ExecutionPayloadHeader `json:"header"`
 	Value  Uint256                 `json:"value"`
 	Pubkey hexutil.Bytes           `json:"pubkey"`
 }

-// ExecutionPayloadHeader is a field in BuilderBid.
 type ExecutionPayloadHeader struct {
 	ParentHash       hexutil.Bytes `json:"parent_hash"`
 	FeeRecipient     hexutil.Bytes `json:"fee_recipient"`
@@ -280,7 +260,6 @@ type ExecutionPayloadHeader struct {
 	*v1.ExecutionPayloadHeader
 }

-// MarshalJSON returns the JSON bytes representation of ExecutionPayloadHeader.
 func (h *ExecutionPayloadHeader) MarshalJSON() ([]byte, error) {
 	type MarshalCaller ExecutionPayloadHeader
 	baseFeePerGas, err := sszBytesToUint256(h.ExecutionPayloadHeader.BaseFeePerGas)
@@ -305,7 +284,6 @@ func (h *ExecutionPayloadHeader) MarshalJSON() ([]byte, error) {
 	})
 }

-// UnmarshalJSON takes in a JSON byte array and sets ExecutionPayloadHeader.
 func (h *ExecutionPayloadHeader) UnmarshalJSON(b []byte) error {
 	type UnmarshalCaller ExecutionPayloadHeader
 	uc := &UnmarshalCaller{}
@@ -319,13 +297,11 @@ func (h *ExecutionPayloadHeader) UnmarshalJSON(b []byte) error {
 	return err
 }

-// ExecPayloadResponse is the builder API /eth/v1/builder/blinded_blocks for Bellatrix.
 type ExecPayloadResponse struct {
 	Version string           `json:"version"`
 	Data    ExecutionPayload `json:"data"`
 }

-// ExecutionPayload is a field of ExecPayloadResponse
 type ExecutionPayload struct {
 	ParentHash    hexutil.Bytes   `json:"parent_hash"`
 	FeeRecipient  hexutil.Bytes   `json:"fee_recipient"`
@@ -343,104 +319,33 @@ type ExecutionPayload struct {
 	Transactions  []hexutil.Bytes `json:"transactions"`
 }

-// ToProto returns a ExecutionPayload Proto from ExecPayloadResponse
 func (r *ExecPayloadResponse) ToProto() (*v1.ExecutionPayload, error) {
 	return r.Data.ToProto()
 }

-// ToProto returns a ExecutionPayload Proto
 func (p *ExecutionPayload) ToProto() (*v1.ExecutionPayload, error) {
 	txs := make([][]byte, len(p.Transactions))
 	for i := range p.Transactions {
-		txs[i] = bytesutil.SafeCopyBytes(p.Transactions[i])
+		txs[i] = p.Transactions[i]
 	}
 	return &v1.ExecutionPayload{
-		ParentHash:    bytesutil.SafeCopyBytes(p.ParentHash),
-		FeeRecipient:  bytesutil.SafeCopyBytes(p.FeeRecipient),
-		StateRoot:     bytesutil.SafeCopyBytes(p.StateRoot),
-		ReceiptsRoot:  bytesutil.SafeCopyBytes(p.ReceiptsRoot),
-		LogsBloom:     bytesutil.SafeCopyBytes(p.LogsBloom),
-		PrevRandao:    bytesutil.SafeCopyBytes(p.PrevRandao),
+		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:     bytesutil.SafeCopyBytes(p.ExtraData),
-		BaseFeePerGas: bytesutil.SafeCopyBytes(p.BaseFeePerGas.SSZBytes()),
-		BlockHash:     bytesutil.SafeCopyBytes(p.BlockHash),
+		ExtraData:     p.ExtraData,
+		BaseFeePerGas: p.BaseFeePerGas.SSZBytes(),
+		BlockHash:     p.BlockHash,
 		Transactions:  txs,
 	}, nil
 }

-// FromProto converts a proto execution payload type to our builder
-// compatible payload type.
-func FromProto(payload *v1.ExecutionPayload) (ExecutionPayload, error) {
-	bFee, err := sszBytesToUint256(payload.BaseFeePerGas)
-	if err != nil {
-		return ExecutionPayload{}, err
-	}
-	txs := make([]hexutil.Bytes, len(payload.Transactions))
-	for i := range payload.Transactions {
-		txs[i] = bytesutil.SafeCopyBytes(payload.Transactions[i])
-	}
-	return ExecutionPayload{
-		ParentHash:    bytesutil.SafeCopyBytes(payload.ParentHash),
-		FeeRecipient:  bytesutil.SafeCopyBytes(payload.FeeRecipient),
-		StateRoot:     bytesutil.SafeCopyBytes(payload.StateRoot),
-		ReceiptsRoot:  bytesutil.SafeCopyBytes(payload.ReceiptsRoot),
-		LogsBloom:     bytesutil.SafeCopyBytes(payload.LogsBloom),
-		PrevRandao:    bytesutil.SafeCopyBytes(payload.PrevRandao),
-		BlockNumber:   Uint64String(payload.BlockNumber),
-		GasLimit:      Uint64String(payload.GasLimit),
-		GasUsed:       Uint64String(payload.GasUsed),
-		Timestamp:     Uint64String(payload.Timestamp),
-		ExtraData:     bytesutil.SafeCopyBytes(payload.ExtraData),
-		BaseFeePerGas: bFee,
-		BlockHash:     bytesutil.SafeCopyBytes(payload.BlockHash),
-		Transactions:  txs,
-	}, nil
-}
-
-// FromProtoCapella converts a proto execution payload type for capella to our
-// builder compatible payload type.
-func FromProtoCapella(payload *v1.ExecutionPayloadCapella) (ExecutionPayloadCapella, error) {
-	bFee, err := sszBytesToUint256(payload.BaseFeePerGas)
-	if err != nil {
-		return ExecutionPayloadCapella{}, err
-	}
-	txs := make([]hexutil.Bytes, len(payload.Transactions))
-	for i := range payload.Transactions {
-		txs[i] = bytesutil.SafeCopyBytes(payload.Transactions[i])
-	}
-	withdrawals := make([]Withdrawal, len(payload.Withdrawals))
-	for i, w := range payload.Withdrawals {
-		withdrawals[i] = Withdrawal{
-			Index:          Uint256{Int: big.NewInt(0).SetUint64(w.Index)},
-			ValidatorIndex: Uint256{Int: big.NewInt(0).SetUint64(uint64(w.ValidatorIndex))},
-			Address:        bytesutil.SafeCopyBytes(w.Address),
-			Amount:         Uint256{Int: big.NewInt(0).SetUint64(w.Amount)},
-		}
-	}
-	return ExecutionPayloadCapella{
-		ParentHash:    bytesutil.SafeCopyBytes(payload.ParentHash),
-		FeeRecipient:  bytesutil.SafeCopyBytes(payload.FeeRecipient),
-		StateRoot:     bytesutil.SafeCopyBytes(payload.StateRoot),
-		ReceiptsRoot:  bytesutil.SafeCopyBytes(payload.ReceiptsRoot),
-		LogsBloom:     bytesutil.SafeCopyBytes(payload.LogsBloom),
-		PrevRandao:    bytesutil.SafeCopyBytes(payload.PrevRandao),
-		BlockNumber:   Uint64String(payload.BlockNumber),
-		GasLimit:      Uint64String(payload.GasLimit),
-		GasUsed:       Uint64String(payload.GasUsed),
-		Timestamp:     Uint64String(payload.Timestamp),
-		ExtraData:     bytesutil.SafeCopyBytes(payload.ExtraData),
-		BaseFeePerGas: bFee,
-		BlockHash:     bytesutil.SafeCopyBytes(payload.BlockHash),
-		Transactions:  txs,
-		Withdrawals:   withdrawals,
-	}, nil
-}
-
-// ExecHeaderResponseCapella is the response of builder API /eth/v1/builder/header/{slot}/{parent_hash}/{pubkey} for Capella.
 type ExecHeaderResponseCapella struct {
 	Data struct {
 		Signature hexutil.Bytes      `json:"signature"`
@@ -448,7 +353,6 @@ type ExecHeaderResponseCapella struct {
 	} `json:"data"`
 }

-// ToProto returns a SignedBuilderBidCapella Proto from ExecHeaderResponseCapella.
 func (ehr *ExecHeaderResponseCapella) ToProto() (*eth.SignedBuilderBidCapella, error) {
 	bb, err := ehr.Data.Message.ToProto()
 	if err != nil {
@@ -456,11 +360,10 @@ func (ehr *ExecHeaderResponseCapella) ToProto() (*eth.SignedBuilderBidCapella, e
 	}
 	return &eth.SignedBuilderBidCapella{
 		Message:   bb,
-		Signature: bytesutil.SafeCopyBytes(ehr.Data.Signature),
+		Signature: ehr.Data.Signature,
 	}, nil
 }

-// ToProto returns a BuilderBidCapella Proto.
 func (bb *BuilderBidCapella) ToProto() (*eth.BuilderBidCapella, error) {
 	header, err := bb.Header.ToProto()
 	if err != nil {
@@ -468,40 +371,37 @@ func (bb *BuilderBidCapella) ToProto() (*eth.BuilderBidCapella, error) {
 	}
 	return &eth.BuilderBidCapella{
 		Header: header,
-		Value:  bytesutil.SafeCopyBytes(bb.Value.SSZBytes()),
-		Pubkey: bytesutil.SafeCopyBytes(bb.Pubkey),
+		Value:  bb.Value.SSZBytes(),
+		Pubkey: bb.Pubkey,
 	}, nil
 }

-// ToProto returns a ExecutionPayloadHeaderCapella Proto
 func (h *ExecutionPayloadHeaderCapella) ToProto() (*v1.ExecutionPayloadHeaderCapella, error) {
 	return &v1.ExecutionPayloadHeaderCapella{
-		ParentHash:       bytesutil.SafeCopyBytes(h.ParentHash),
-		FeeRecipient:     bytesutil.SafeCopyBytes(h.FeeRecipient),
-		StateRoot:        bytesutil.SafeCopyBytes(h.StateRoot),
-		ReceiptsRoot:     bytesutil.SafeCopyBytes(h.ReceiptsRoot),
-		LogsBloom:        bytesutil.SafeCopyBytes(h.LogsBloom),
-		PrevRandao:       bytesutil.SafeCopyBytes(h.PrevRandao),
+		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:        bytesutil.SafeCopyBytes(h.ExtraData),
-		BaseFeePerGas:    bytesutil.SafeCopyBytes(h.BaseFeePerGas.SSZBytes()),
-		BlockHash:        bytesutil.SafeCopyBytes(h.BlockHash),
-		TransactionsRoot: bytesutil.SafeCopyBytes(h.TransactionsRoot),
-		WithdrawalsRoot:  bytesutil.SafeCopyBytes(h.WithdrawalsRoot),
+		ExtraData:        h.ExtraData,
+		BaseFeePerGas:    h.BaseFeePerGas.SSZBytes(),
+		BlockHash:        h.BlockHash,
+		TransactionsRoot: h.TransactionsRoot,
+		WithdrawalsRoot:  h.WithdrawalsRoot,
 	}, nil
 }

-// BuilderBidCapella is field of ExecHeaderResponseCapella.
 type BuilderBidCapella struct {
 	Header *ExecutionPayloadHeaderCapella `json:"header"`
 	Value  Uint256                        `json:"value"`
 	Pubkey hexutil.Bytes                  `json:"pubkey"`
 }

-// ExecutionPayloadHeaderCapella is a field in BuilderBidCapella.
 type ExecutionPayloadHeaderCapella struct {
 	ParentHash       hexutil.Bytes `json:"parent_hash"`
 	FeeRecipient     hexutil.Bytes `json:"fee_recipient"`
@@ -521,7 +421,6 @@ type ExecutionPayloadHeaderCapella struct {
 	*v1.ExecutionPayloadHeaderCapella
 }

-// MarshalJSON returns a JSON byte representation of ExecutionPayloadHeaderCapella.
 func (h *ExecutionPayloadHeaderCapella) MarshalJSON() ([]byte, error) {
 	type MarshalCaller ExecutionPayloadHeaderCapella
 	baseFeePerGas, err := sszBytesToUint256(h.ExecutionPayloadHeaderCapella.BaseFeePerGas)
@@ -547,7 +446,6 @@ func (h *ExecutionPayloadHeaderCapella) MarshalJSON() ([]byte, error) {
 	})
 }

-// UnmarshalJSON takes a JSON byte array and sets ExecutionPayloadHeaderCapella.
 func (h *ExecutionPayloadHeaderCapella) UnmarshalJSON(b []byte) error {
 	type UnmarshalCaller ExecutionPayloadHeaderCapella
 	uc := &UnmarshalCaller{}
@@ -561,13 +459,11 @@ func (h *ExecutionPayloadHeaderCapella) UnmarshalJSON(b []byte) error {
 	return err
 }

-// ExecPayloadResponseCapella is the builder API /eth/v1/builder/blinded_blocks for Capella.
 type ExecPayloadResponseCapella struct {
 	Version string                  `json:"version"`
 	Data    ExecutionPayloadCapella `json:"data"`
 }

-// ExecutionPayloadCapella is a field of ExecPayloadResponseCapella.
 type ExecutionPayloadCapella struct {
 	ParentHash    hexutil.Bytes   `json:"parent_hash"`
 	FeeRecipient  hexutil.Bytes   `json:"fee_recipient"`
@@ -586,46 +482,43 @@ type ExecutionPayloadCapella struct {
 	Withdrawals   []Withdrawal    `json:"withdrawals"`
 }

-// ToProto returns a ExecutionPayloadCapella Proto.
 func (r *ExecPayloadResponseCapella) ToProto() (*v1.ExecutionPayloadCapella, error) {
 	return r.Data.ToProto()
 }

-// ToProto returns a ExecutionPayloadCapella Proto.
 func (p *ExecutionPayloadCapella) ToProto() (*v1.ExecutionPayloadCapella, error) {
 	txs := make([][]byte, len(p.Transactions))
 	for i := range p.Transactions {
-		txs[i] = bytesutil.SafeCopyBytes(p.Transactions[i])
+		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:        bytesutil.SafeCopyBytes(w.Address),
+			Address:        w.Address,
 			Amount:         w.Amount.Uint64(),
 		}
 	}
 	return &v1.ExecutionPayloadCapella{
-		ParentHash:    bytesutil.SafeCopyBytes(p.ParentHash),
-		FeeRecipient:  bytesutil.SafeCopyBytes(p.FeeRecipient),
-		StateRoot:     bytesutil.SafeCopyBytes(p.StateRoot),
-		ReceiptsRoot:  bytesutil.SafeCopyBytes(p.ReceiptsRoot),
-		LogsBloom:     bytesutil.SafeCopyBytes(p.LogsBloom),
-		PrevRandao:    bytesutil.SafeCopyBytes(p.PrevRandao),
+		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:     bytesutil.SafeCopyBytes(p.ExtraData),
-		BaseFeePerGas: bytesutil.SafeCopyBytes(p.BaseFeePerGas.SSZBytes()),
-		BlockHash:     bytesutil.SafeCopyBytes(p.BlockHash),
+		ExtraData:     p.ExtraData,
+		BaseFeePerGas: p.BaseFeePerGas.SSZBytes(),
+		BlockHash:     p.BlockHash,
 		Transactions:  txs,
 		Withdrawals:   withdrawals,
 	}, nil
 }

-// Withdrawal is a field of ExecutionPayloadCapella.
 type Withdrawal struct {
 	Index          Uint256       `json:"index"`
 	ValidatorIndex Uint256       `json:"validator_index"`
@@ -633,22 +526,18 @@ type Withdrawal struct {
 	Amount         Uint256       `json:"amount"`
 }

-// SignedBlindedBeaconBlockBellatrix is the request object for builder API /eth/v1/builder/blinded_blocks.
 type SignedBlindedBeaconBlockBellatrix struct {
 	*eth.SignedBlindedBeaconBlockBellatrix
 }

-// BlindedBeaconBlockBellatrix is a field in SignedBlindedBeaconBlockBellatrix.
 type BlindedBeaconBlockBellatrix struct {
 	*eth.BlindedBeaconBlockBellatrix
 }

-// BlindedBeaconBlockBodyBellatrix is a field in BlindedBeaconBlockBellatrix.
 type BlindedBeaconBlockBodyBellatrix struct {
 	*eth.BlindedBeaconBlockBodyBellatrix
 }

-// MarshalJSON returns a JSON byte array representation of SignedBlindedBeaconBlockBellatrix.
 func (r *SignedBlindedBeaconBlockBellatrix) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Message   *BlindedBeaconBlockBellatrix `json:"message"`
@@ -659,7 +548,6 @@ func (r *SignedBlindedBeaconBlockBellatrix) MarshalJSON() ([]byte, error) {
 	})
 }

-// MarshalJSON returns a JSON byte array representation of BlindedBeaconBlockBellatrix.
 func (b *BlindedBeaconBlockBellatrix) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Slot          string                           `json:"slot"`
@@ -676,12 +564,10 @@ func (b *BlindedBeaconBlockBellatrix) MarshalJSON() ([]byte, error) {
 	})
 }

-// ProposerSlashing is a field in BlindedBeaconBlockBodyCapella.
 type ProposerSlashing struct {
 	*eth.ProposerSlashing
 }

-// MarshalJSON returns a JSON byte array representation of ProposerSlashing.
 func (s *ProposerSlashing) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		SignedHeader1 *SignedBeaconBlockHeader `json:"signed_header_1"`
@@ -692,12 +578,10 @@ func (s *ProposerSlashing) MarshalJSON() ([]byte, error) {
 	})
 }

-// SignedBeaconBlockHeader is a field of ProposerSlashing.
 type SignedBeaconBlockHeader struct {
 	*eth.SignedBeaconBlockHeader
 }

-// MarshalJSON returns a JSON byte array representation of SignedBeaconBlockHeader.
 func (h *SignedBeaconBlockHeader) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Header    *BeaconBlockHeader `json:"message"`
@@ -708,12 +592,10 @@ func (h *SignedBeaconBlockHeader) MarshalJSON() ([]byte, error) {
 	})
 }

-// BeaconBlockHeader is a field of SignedBeaconBlockHeader.
 type BeaconBlockHeader struct {
 	*eth.BeaconBlockHeader
 }

-// MarshalJSON returns a JSON byte array representation of BeaconBlockHeader.
 func (h *BeaconBlockHeader) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Slot          string        `json:"slot"`
@@ -730,12 +612,10 @@ func (h *BeaconBlockHeader) MarshalJSON() ([]byte, error) {
 	})
 }

-// IndexedAttestation is a field of AttesterSlashing.
 type IndexedAttestation struct {
 	*eth.IndexedAttestation
 }

-// MarshalJSON returns a JSON byte array representation of IndexedAttestation.
 func (a *IndexedAttestation) MarshalJSON() ([]byte, error) {
 	indices := make([]string, len(a.IndexedAttestation.AttestingIndices))
 	for i := range a.IndexedAttestation.AttestingIndices {
@@ -752,12 +632,10 @@ func (a *IndexedAttestation) MarshalJSON() ([]byte, error) {
 	})
 }

-// AttesterSlashing is a field of a Beacon Block Body.
 type AttesterSlashing struct {
 	*eth.AttesterSlashing
 }

-// MarshalJSON returns a JSON byte array representation of AttesterSlashing.
 func (s *AttesterSlashing) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Attestation1 *IndexedAttestation `json:"attestation_1"`
@@ -768,12 +646,10 @@ func (s *AttesterSlashing) MarshalJSON() ([]byte, error) {
 	})
 }

-// Checkpoint is a field of AttestationData.
 type Checkpoint struct {
 	*eth.Checkpoint
 }

-// MarshalJSON returns a JSON byte array representation of Checkpoint.
 func (c *Checkpoint) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Epoch string        `json:"epoch"`
@@ -784,12 +660,10 @@ func (c *Checkpoint) MarshalJSON() ([]byte, error) {
 	})
 }

-// AttestationData is a field of IndexedAttestation.
 type AttestationData struct {
 	*eth.AttestationData
 }

-// MarshalJSON returns a JSON byte array representation of AttestationData.
 func (a *AttestationData) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Slot            string        `json:"slot"`
@@ -806,12 +680,10 @@ func (a *AttestationData) MarshalJSON() ([]byte, error) {
 	})
 }

-// Attestation is a field of Beacon Block Body.
 type Attestation struct {
 	*eth.Attestation
 }

-// MarshalJSON returns a JSON byte array representation of Attestation.
 func (a *Attestation) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		AggregationBits hexutil.Bytes    `json:"aggregation_bits"`
@@ -824,12 +696,10 @@ func (a *Attestation) MarshalJSON() ([]byte, error) {
 	})
 }

-// DepositData is a field of Deposit.
 type DepositData struct {
 	*eth.Deposit_Data
 }

-// MarshalJSON returns a JSON byte array representation of DepositData.
 func (d *DepositData) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		PublicKey             hexutil.Bytes `json:"pubkey"`
@@ -844,12 +714,10 @@ func (d *DepositData) MarshalJSON() ([]byte, error) {
 	})
 }

-// Deposit is a field of Beacon Block Body.
 type Deposit struct {
 	*eth.Deposit
 }

-// MarshalJSON returns a JSON byte array representation of Deposit.
 func (d *Deposit) MarshalJSON() ([]byte, error) {
 	proof := make([]hexutil.Bytes, len(d.Proof))
 	for i := range d.Proof {
@@ -864,12 +732,10 @@ func (d *Deposit) MarshalJSON() ([]byte, error) {
 	})
 }

-// SignedVoluntaryExit is a field of Beacon Block Body.
 type SignedVoluntaryExit struct {
 	*eth.SignedVoluntaryExit
 }

-// MarshalJSON returns a JSON byte array representation of SignedVoluntaryExit.
 func (sve *SignedVoluntaryExit) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Message   *VoluntaryExit `json:"message"`
@@ -880,12 +746,10 @@ func (sve *SignedVoluntaryExit) MarshalJSON() ([]byte, error) {
 	})
 }

-// VoluntaryExit is a field in SignedVoluntaryExit
 type VoluntaryExit struct {
 	*eth.VoluntaryExit
 }

-// MarshalJSON returns a JSON byte array representation of VoluntaryExit
 func (ve *VoluntaryExit) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Epoch          string `json:"epoch"`
@@ -896,12 +760,10 @@ func (ve *VoluntaryExit) MarshalJSON() ([]byte, error) {
 	})
 }

-// SyncAggregate is a field of Beacon Block Body.
 type SyncAggregate struct {
 	*eth.SyncAggregate
 }

-// MarshalJSON returns a JSON byte array representation of SyncAggregate.
 func (s *SyncAggregate) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		SyncCommitteeBits      hexutil.Bytes `json:"sync_committee_bits"`
@@ -912,12 +774,10 @@ func (s *SyncAggregate) MarshalJSON() ([]byte, error) {
 	})
 }

-// Eth1Data is a field of Beacon Block Body.
 type Eth1Data struct {
 	*eth.Eth1Data
 }

-// MarshalJSON returns a JSON byte array representation of Eth1Data.
 func (e *Eth1Data) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		DepositRoot  hexutil.Bytes `json:"deposit_root"`
@@ -930,7 +790,6 @@ func (e *Eth1Data) MarshalJSON() ([]byte, error) {
 	})
 }

-// MarshalJSON returns a JSON byte array representation of BlindedBeaconBlockBodyBellatrix.
 func (b *BlindedBeaconBlockBodyBellatrix) MarshalJSON() ([]byte, error) {
 	sve := make([]*SignedVoluntaryExit, len(b.BlindedBeaconBlockBodyBellatrix.VoluntaryExits))
 	for i := range b.BlindedBeaconBlockBodyBellatrix.VoluntaryExits {
@@ -977,12 +836,10 @@ func (b *BlindedBeaconBlockBodyBellatrix) MarshalJSON() ([]byte, error) {
 	})
 }

-// SignedBLSToExecutionChange is a field in Beacon Block Body for capella and above.
 type SignedBLSToExecutionChange struct {
 	*eth.SignedBLSToExecutionChange
 }

-// MarshalJSON returns a JSON byte array representation of SignedBLSToExecutionChange.
 func (ch *SignedBLSToExecutionChange) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Message   *BLSToExecutionChange `json:"message"`
@@ -993,12 +850,10 @@ func (ch *SignedBLSToExecutionChange) MarshalJSON() ([]byte, error) {
 	})
 }

-// BLSToExecutionChange is a field in SignedBLSToExecutionChange.
 type BLSToExecutionChange struct {
 	*eth.BLSToExecutionChange
 }

-// MarshalJSON returns a JSON byte array representation of BLSToExecutionChange.
 func (ch *BLSToExecutionChange) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		ValidatorIndex     string        `json:"validator_index"`
@@ -1011,22 +866,18 @@ func (ch *BLSToExecutionChange) MarshalJSON() ([]byte, error) {
 	})
 }

-// SignedBlindedBeaconBlockCapella is part of the request object sent to builder API /eth/v1/builder/blinded_blocks for Capella.
 type SignedBlindedBeaconBlockCapella struct {
 	*eth.SignedBlindedBeaconBlockCapella
 }

-// BlindedBeaconBlockCapella is a field in SignedBlindedBeaconBlockCapella.
 type BlindedBeaconBlockCapella struct {
 	*eth.BlindedBeaconBlockCapella
 }

-// BlindedBeaconBlockBodyCapella is a field in BlindedBeaconBlockCapella.
 type BlindedBeaconBlockBodyCapella struct {
 	*eth.BlindedBeaconBlockBodyCapella
 }

-// MarshalJSON returns a JSON byte array representation of SignedBlindedBeaconBlockCapella.
 func (b *SignedBlindedBeaconBlockCapella) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Message   *BlindedBeaconBlockCapella `json:"message"`
@@ -1037,7 +888,6 @@ func (b *SignedBlindedBeaconBlockCapella) MarshalJSON() ([]byte, error) {
 	})
 }

-// MarshalJSON returns a JSON byte array representation of BlindedBeaconBlockCapella
 func (b *BlindedBeaconBlockCapella) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Slot          string                         `json:"slot"`
@@ -1054,7 +904,6 @@ func (b *BlindedBeaconBlockCapella) MarshalJSON() ([]byte, error) {
 	})
 }

-// MarshalJSON returns a JSON byte array representation of BlindedBeaconBlockBodyCapella
 func (b *BlindedBeaconBlockBodyCapella) MarshalJSON() ([]byte, error) {
 	sve := make([]*SignedVoluntaryExit, len(b.VoluntaryExits))
 	for i := range b.VoluntaryExits {
@@ -1107,7 +956,6 @@ func (b *BlindedBeaconBlockBodyCapella) MarshalJSON() ([]byte, error) {
 	})
 }

-// ErrorMessage is a JSON representation of the builder API's returned error message.
 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
@@ -1156,14 +1156,6 @@ func TestUint256Unmarshal(t *testing.T) {
 	require.Equal(t, expected, string(m))
 }

-func TestUint256Unmarshal_BadData(t *testing.T) {
-	var bigNum Uint256
-
-	assert.ErrorContains(t, "provided Uint256 json string is too short", bigNum.UnmarshalJSON([]byte{'"'}))
-	assert.ErrorContains(t, "provided Uint256 json string is malformed", bigNum.UnmarshalJSON([]byte{'"', '1', '2'}))
-
-}
-
 func TestUint256UnmarshalNegative(t *testing.T) {
 	m := "-1"
 	var value Uint256
--- a/api/client/client.go
+++ b/api/client/client.go
@@ -1,97 +0,0 @@
-package client
-
-import (
-	"context"
-	"io"
-	"net"
-	"net/http"
-	"net/url"
-
-	"github.com/pkg/errors"
-)
-
-// Client is a wrapper object around the HTTP client.
-type Client struct {
-	hc      *http.Client
-	baseURL *url.URL
-	token   string
-}
-
-// NewClient constructs a new client with the provided options (ex WithTimeout).
-// `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) {
-	u, err := urlForHost(host)
-	if err != nil {
-		return nil, err
-	}
-	c := &Client{
-		hc:      &http.Client{},
-		baseURL: u,
-	}
-	for _, o := range opts {
-		o(c)
-	}
-	return c, nil
-}
-
-// Token returns the bearer token used for jwt authentication
-func (c *Client) Token() string {
-	return c.token
-}
-
-// BaseURL returns the base url of the client
-func (c *Client) BaseURL() *url.URL {
-	return c.baseURL
-}
-
-// Do execute the request against the http client
-func (c *Client) Do(req *http.Request) (*http.Response, error) {
-	return c.hc.Do(req)
-}
-
-func urlForHost(h string) (*url.URL, error) {
-	// try to parse as url (being permissive)
-	u, err := url.Parse(h)
-	if err == nil && u.Host != "" {
-		return u, nil
-	}
-	// try to parse as host:port
-	host, port, err := net.SplitHostPort(h)
-	if err != nil {
-		return nil, ErrMalformedHostname
-	}
-	return &url.URL{Host: net.JoinHostPort(host, port), Scheme: "http"}, nil
-}
-
-// NodeURL returns a human-readable string representation of the beacon node base url.
-func (c *Client) NodeURL() string {
-	return c.baseURL.String()
-}
-
-// 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})
-	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
-	if err != nil {
-		return nil, err
-	}
-	for _, o := range opts {
-		o(req)
-	}
-	r, err := c.hc.Do(req)
-	if err != nil {
-		return nil, err
-	}
-	defer func() {
-		err = r.Body.Close()
-	}()
-	if r.StatusCode != http.StatusOK {
-		return nil, Non200Err(r)
-	}
-	b, err := io.ReadAll(r.Body)
-	if err != nil {
-		return nil, errors.Wrap(err, "error reading http response body")
-	}
-	return b, nil
-}
--- a/api/client/client_test.go
+++ b/api/client/client_test.go
@@ -1,48 +0,0 @@
-package client
-
-import (
-	"net/url"
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v4/testing/require"
-)
-
-func TestValidHostname(t *testing.T) {
-	cases := []struct {
-		name    string
-		hostArg string
-		path    string
-		joined  string
-		err     error
-	}{
-		{
-			name:    "hostname without port",
-			hostArg: "mydomain.org",
-			err:     ErrMalformedHostname,
-		},
-	}
-	for _, c := range cases {
-		t.Run(c.name, func(t *testing.T) {
-			cl, err := NewClient(c.hostArg)
-			if c.err != nil {
-				require.ErrorIs(t, err, c.err)
-				return
-			}
-			require.NoError(t, err)
-			require.Equal(t, c.joined, cl.BaseURL().ResolveReference(&url.URL{Path: c.path}).String())
-		})
-	}
-}
-
-func TestWithAuthenticationToken(t *testing.T) {
-	cl, err := NewClient("https://www.offchainlabs.com:3500", WithAuthenticationToken("my token"))
-	require.NoError(t, err)
-	require.Equal(t, cl.Token(), "my token")
-}
-
-func TestBaseURL(t *testing.T) {
-	cl, err := NewClient("https://www.offchainlabs.com:3500")
-	require.NoError(t, err)
-	require.Equal(t, "www.offchainlabs.com", cl.BaseURL().Hostname())
-	require.Equal(t, "3500", cl.BaseURL().Port())
-}
--- a/api/client/errors.go
+++ b/api/client/errors.go
@@ -1,40 +0,0 @@
-package client
-
-import (
-	"fmt"
-	"io"
-	"net/http"
-
-	"github.com/pkg/errors"
-)
-
-// ErrMalformedHostname is used to indicate if a host name's format is incorrect.
-var ErrMalformedHostname = errors.New("hostname must include port, separated by one colon, like example.com:3500")
-
-// ErrNotOK is used to indicate when an HTTP request to the API failed with any non-2xx response code.
-// More specific errors may be returned, but an error in reaction to a non-2xx response will always wrap ErrNotOK.
-var ErrNotOK = errors.New("did not receive 2xx response from API")
-
-// ErrNotFound specifically means that a '404 - NOT FOUND' response was received from the API.
-var ErrNotFound = errors.Wrap(ErrNotOK, "recv 404 NotFound response from API")
-
-// ErrInvalidNodeVersion indicates that the /eth/v1/node/version API response format was not recognized.
-var ErrInvalidNodeVersion = errors.New("invalid node version response")
-
-// Non200Err is a function that parses an HTTP response to handle responses that are not 200 with a formatted error.
-func Non200Err(response *http.Response) error {
-	bodyBytes, err := io.ReadAll(response.Body)
-	var body string
-	if err != nil {
-		body = "(Unable to read response body.)"
-	} else {
-		body = "response body:\n" + string(bodyBytes)
-	}
-	msg := fmt.Sprintf("code=%d, url=%s, body=%s", response.StatusCode, response.Request.URL, body)
-	switch response.StatusCode {
-	case 404:
-		return errors.Wrap(ErrNotFound, msg)
-	default:
-		return errors.Wrap(ErrNotOK, msg)
-	}
-}
--- a/api/client/options.go
+++ b/api/client/options.go
@@ -1,48 +0,0 @@
-package client
-
-import (
-	"fmt"
-	"net/http"
-	"time"
-)
-
-// ReqOption is a request functional option.
-type ReqOption func(*http.Request)
-
-// WithSSZEncoding is a request functional option that adds SSZ encoding header.
-func WithSSZEncoding() ReqOption {
-	return func(req *http.Request) {
-		req.Header.Set("Accept", "application/octet-stream")
-	}
-}
-
-// WithAuthorizationToken is a request functional option that adds header for authorization token.
-func WithAuthorizationToken(token string) ReqOption {
-	return func(req *http.Request) {
-		req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", token))
-	}
-}
-
-// 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
-	}
-}
-
-// WithRoundTripper replaces the underlying HTTP's transport with a custom one.
-func WithRoundTripper(t http.RoundTripper) ClientOpt {
-	return func(c *Client) {
-		c.hc.Transport = t
-	}
-}
-
-// WithAuthenticationToken sets an oauth token to be used.
-func WithAuthenticationToken(token string) ClientOpt {
-	return func(c *Client) {
-		c.token = token
-	}
-}
--- a/api/client/validator/BUILD.bazel
+++ b/api/client/validator/BUILD.bazel
@@ -1,13 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library")
-
-go_library(
-    name = "go_default_library",
-    srcs = ["client.go"],
-    importpath = "github.com/prysmaticlabs/prysm/v4/api/client/validator",
-    visibility = ["//visibility:public"],
-    deps = [
-        "//api/client:go_default_library",
-        "//validator/rpc/apimiddleware:go_default_library",
-        "@com_github_pkg_errors//:go_default_library",
-    ],
-)
--- a/api/client/validator/client.go
+++ b/api/client/validator/client.go
@@ -1,121 +0,0 @@
-package validator
-
-import (
-	"context"
-	"encoding/json"
-	"fmt"
-	"strings"
-
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v4/api/client"
-	"github.com/prysmaticlabs/prysm/v4/validator/rpc/apimiddleware"
-)
-
-const (
-	localKeysPath    = "/eth/v1/keystores"
-	remoteKeysPath   = "/eth/v1/remotekeys"
-	feeRecipientPath = "/eth/v1/validator/{pubkey}/feerecipient"
-)
-
-// Client provides a collection of helper methods for calling the Keymanager API endpoints.
-type Client struct {
-	*client.Client
-}
-
-// NewClient returns a new Client that includes functions for REST calls to keymanager APIs.
-func NewClient(host string, opts ...client.ClientOpt) (*Client, error) {
-	c, err := client.NewClient(host, opts...)
-	if err != nil {
-		return nil, err
-	}
-	return &Client{c}, nil
-}
-
-// GetValidatorPubKeys gets the current list of web3signer or the local validator public keys in hex format.
-func (c *Client) GetValidatorPubKeys(ctx context.Context) ([]string, error) {
-	jsonlocal, err := c.GetLocalValidatorKeys(ctx)
-	if err != nil {
-		return nil, err
-	}
-	jsonremote, err := c.GetRemoteValidatorKeys(ctx)
-	if err != nil {
-		return nil, err
-	}
-	if len(jsonlocal.Keystores) == 0 && len(jsonremote.Keystores) == 0 {
-		return nil, errors.New("there are no local keys or remote keys on the validator")
-	}
-
-	hexKeys := make(map[string]bool)
-
-	for index := range jsonlocal.Keystores {
-		hexKeys[jsonlocal.Keystores[index].ValidatingPubkey] = true
-	}
-	for index := range jsonremote.Keystores {
-		hexKeys[jsonremote.Keystores[index].Pubkey] = true
-	}
-	keys := make([]string, 0)
-	for k := range hexKeys {
-		keys = append(keys, k)
-	}
-	return keys, nil
-}
-
-// GetLocalValidatorKeys calls the keymanager APIs for local validator keys
-func (c *Client) GetLocalValidatorKeys(ctx context.Context) (*apimiddleware.ListKeystoresResponseJson, error) {
-	localBytes, err := c.Get(ctx, localKeysPath, client.WithAuthorizationToken(c.Token()))
-	if err != nil {
-		return nil, err
-	}
-	jsonlocal := &apimiddleware.ListKeystoresResponseJson{}
-	if err := json.Unmarshal(localBytes, jsonlocal); err != nil {
-		return nil, errors.Wrap(err, "failed to parse local keystore list")
-	}
-	return jsonlocal, nil
-}
-
-// GetRemoteValidatorKeys calls the keymanager APIs for web3signer validator keys
-func (c *Client) GetRemoteValidatorKeys(ctx context.Context) (*apimiddleware.ListRemoteKeysResponseJson, error) {
-	remoteBytes, err := c.Get(ctx, remoteKeysPath, client.WithAuthorizationToken(c.Token()))
-	if err != nil {
-		if !strings.Contains(err.Error(), "Prysm Wallet is not of type Web3Signer") {
-			return nil, err
-		}
-	}
-	jsonremote := &apimiddleware.ListRemoteKeysResponseJson{}
-	if len(remoteBytes) != 0 {
-		if err := json.Unmarshal(remoteBytes, jsonremote); err != nil {
-			return nil, errors.Wrap(err, "failed to parse remote keystore list")
-		}
-	}
-	return jsonremote, nil
-}
-
-// GetFeeRecipientAddresses takes a list of validators in hex format and returns an equal length list of fee recipients in hex format.
-func (c *Client) GetFeeRecipientAddresses(ctx context.Context, validators []string) ([]string, error) {
-	feeRecipients := make([]string, len(validators))
-	for index, validator := range validators {
-		feejson, err := c.GetFeeRecipientAddress(ctx, validator)
-		if err != nil {
-			return nil, errors.Wrap(err, fmt.Sprintf("keymanager API failed to retrieve fee recipient for validator %s", validators[index]))
-		}
-		if feejson.Data == nil {
-			continue
-		}
-		feeRecipients[index] = feejson.Data.Ethaddress
-	}
-	return feeRecipients, nil
-}
-
-// GetFeeRecipientAddress takes a public key and calls the keymanager API to return its fee recipient.
-func (c *Client) GetFeeRecipientAddress(ctx context.Context, pubkey string) (*apimiddleware.GetFeeRecipientByPubkeyResponseJson, error) {
-	path := strings.Replace(feeRecipientPath, "{pubkey}", pubkey, 1)
-	b, err := c.Get(ctx, path, client.WithAuthorizationToken(c.Token()))
-	if err != nil {
-		return nil, err
-	}
-	feejson := &apimiddleware.GetFeeRecipientByPubkeyResponseJson{}
-	if err := json.Unmarshal(b, feejson); err != nil {
-		return nil, errors.Wrap(err, "failed to parse fee recipient")
-	}
-	return feejson, nil
-}
--- a/api/gateway/apimiddleware/BUILD.bazel
+++ b/api/gateway/apimiddleware/BUILD.bazel
@@ -13,7 +13,6 @@ go_library(
    importpath = "github.com/prysmaticlabs/prysm/v4/api/gateway/apimiddleware",
    visibility = ["//visibility:public"],
    deps = [
-        "//api:go_default_library",
        "//api/grpc:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "@com_github_ethereum_go_ethereum//common:go_default_library",
@@ -33,7 +32,6 @@ go_test(
    ],
    embed = [":go_default_library"],
    deps = [
-        "//api:go_default_library",
        "//api/grpc:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
--- a/api/gateway/apimiddleware/process_request.go
+++ b/api/gateway/apimiddleware/process_request.go
@@ -10,7 +10,6 @@ import (
 	"strings"

 	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v4/api"
 	"github.com/prysmaticlabs/prysm/v4/api/grpc"
 )

@@ -117,11 +116,7 @@ func HandleGrpcResponseError(errJson ErrorJson, resp *http.Response, respBody []
 		// Something went wrong, but the request completed, meaning we can write headers and the error message.
 		for h, vs := range resp.Header {
 			for _, v := range vs {
-				if strings.HasSuffix(h, api.VersionHeader) {
-					w.Header().Set(api.VersionHeader, v)
-				} else {
-					w.Header().Set(h, v)
-				}
+				w.Header().Set(h, v)
 			}
 		}
 		// Handle gRPC timeout.
@@ -192,11 +187,9 @@ func WriteMiddlewareResponseHeadersAndBody(grpcResp *http.Response, responseJson
 	var statusCodeHeader string
 	for h, vs := range grpcResp.Header {
 		// We don't want to expose any gRPC metadata in the HTTP response, so we skip forwarding metadata headers.
-		if strings.HasPrefix(h, grpc.MetadataPrefix) {
-			if h == grpc.WithPrefix(grpc.HttpCodeMetadataKey) {
+		if strings.HasPrefix(h, "Grpc-Metadata") {
+			if h == "Grpc-Metadata-"+grpc.HttpCodeMetadataKey {
 				statusCodeHeader = vs[0]
-			} else if strings.HasSuffix(h, api.VersionHeader) {
-				w.Header().Set(api.VersionHeader, vs[0])
 			}
 		} else {
 			for _, v := range vs {
@@ -230,7 +223,7 @@ func WriteError(w http.ResponseWriter, errJson ErrorJson, responseHeader http.He
 	// Include custom error in the error JSON.
 	hasCustomError := false
 	if responseHeader != nil {
-		customError, ok := responseHeader[grpc.WithPrefix(grpc.CustomErrorMetadataKey)]
+		customError, ok := responseHeader["Grpc-Metadata-"+grpc.CustomErrorMetadataKey]
 		if ok {
 			hasCustomError = true
 			// Assume header has only one value and read the 0 index.
--- a/api/gateway/apimiddleware/process_request_test.go
+++ b/api/gateway/apimiddleware/process_request_test.go
@@ -8,7 +8,6 @@ import (
 	"strings"
 	"testing"

-	"github.com/prysmaticlabs/prysm/v4/api"
 	"github.com/prysmaticlabs/prysm/v4/api/grpc"
 	"github.com/prysmaticlabs/prysm/v4/testing/assert"
 	"github.com/prysmaticlabs/prysm/v4/testing/require"
@@ -281,8 +280,7 @@ func TestWriteMiddlewareResponseHeadersAndBody(t *testing.T) {
 		response := &http.Response{
 			Header: http.Header{
 				"Foo": []string{"foo"},
-				grpc.WithPrefix(grpc.HttpCodeMetadataKey): []string{"204"},
-				grpc.WithPrefix(api.VersionHeader):        []string{"capella"},
+				"Grpc-Metadata-" + grpc.HttpCodeMetadataKey: []string{"204"},
 			},
 		}
 		container := defaultResponseContainer()
@@ -301,9 +299,6 @@ func TestWriteMiddlewareResponseHeadersAndBody(t *testing.T) {
 		require.Equal(t, true, ok, "header not found")
 		require.Equal(t, 1, len(v), "wrong number of header values")
 		assert.Equal(t, "224", v[0])
-		v, ok = writer.Header()["Eth-Consensus-Version"]
-		require.Equal(t, true, ok, "header not found")
-		assert.Equal(t, "capella", v[0])
 		assert.Equal(t, 204, writer.Code)
 		assert.DeepEqual(t, responseJson, writer.Body.Bytes())
 	})
@@ -325,12 +320,11 @@ func TestWriteMiddlewareResponseHeadersAndBody(t *testing.T) {

 	t.Run("GET_invalid_status_code", func(t *testing.T) {
 		response := &http.Response{
-			Header: http.Header{"Grpc-Metadata-Eth-Consensus-Version": []string{"capella"}},
+			Header: http.Header{},
 		}

 		// Set invalid status code.
-		response.Header[grpc.WithPrefix(grpc.HttpCodeMetadataKey)] = []string{"invalid"}
-		response.Header[grpc.WithPrefix(api.VersionHeader)] = []string{"capella"}
+		response.Header["Grpc-Metadata-"+grpc.HttpCodeMetadataKey] = []string{"invalid"}

 		container := defaultResponseContainer()
 		responseJson, err := json.Marshal(container)
@@ -396,7 +390,7 @@ func TestWriteMiddlewareResponseHeadersAndBody(t *testing.T) {
 func TestWriteError(t *testing.T) {
 	t.Run("ok", func(t *testing.T) {
 		responseHeader := http.Header{
-			grpc.WithPrefix(grpc.CustomErrorMetadataKey): []string{"{\"CustomField\":\"bar\"}"},
+			"Grpc-Metadata-" + grpc.CustomErrorMetadataKey: []string{"{\"CustomField\":\"bar\"}"},
 		}
 		errJson := &testErrorJson{
 			Message: "foo",
@@ -426,7 +420,7 @@ func TestWriteError(t *testing.T) {
 		logHook := test.NewGlobal()

 		responseHeader := http.Header{
-			grpc.WithPrefix(grpc.CustomErrorMetadataKey): []string{"invalid"},
+			"Grpc-Metadata-" + grpc.CustomErrorMetadataKey: []string{"invalid"},
 		}

 		WriteError(httptest.NewRecorder(), &testErrorJson{}, responseHeader)
--- a/api/grpc/parameters.go
+++ b/api/grpc/parameters.go
@@ -6,11 +6,3 @@ const CustomErrorMetadataKey = "Custom-Error"

 // HttpCodeMetadataKey is the key to use when setting custom HTTP status codes in gRPC metadata.
 const HttpCodeMetadataKey = "X-Http-Code"
-
-// MetadataPrefix is the prefix for grpc headers on metadata
-const MetadataPrefix = "Grpc-Metadata"
-
-// WithPrefix creates a new string with grpc metadata prefix
-func WithPrefix(value string) string {
-	return MetadataPrefix + "-" + value
-}
--- a/api/headers.go
+++ b/api/headers.go
@@ -1,7 +0,0 @@
-package api
-
-const (
-	VersionHeader        = "Eth-Consensus-Version"
-	JsonMediaType        = "application/json"
-	OctetStreamMediaType = "application/octet-stream"
-)
--- a/async/event/feed.go
+++ b/async/event/feed.go
@@ -144,7 +144,6 @@ func (f *Feed) Send(value interface{}) (nsent int) {

 	if !f.typecheck(rvalue.Type()) {
 		f.sendLock <- struct{}{}
-		f.mu.Unlock()
 		panic(feedTypeError{op: "Send", got: rvalue.Type(), want: f.etype})
 	}
 	f.mu.Unlock()
--- a/async/event/feed_test.go
+++ b/async/event/feed_test.go
@@ -32,8 +32,6 @@ func TestFeedPanics(t *testing.T) {
 		f.Send(2)
 		want := feedTypeError{op: "Send", got: reflect.TypeOf(uint64(0)), want: reflect.TypeOf(0)}
 		assert.NoError(t, checkPanic(want, func() { f.Send(uint64(2)) }))
-		// Validate it doesn't deadlock.
-		assert.NoError(t, checkPanic(want, func() { f.Send(uint64(2)) }))
 	}
 	{
 		var f Feed
--- a/beacon-chain/blockchain/chain_info.go
+++ b/beacon-chain/blockchain/chain_info.go
@@ -8,7 +8,6 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice/doubly-linked-tree"
-	forkchoicetypes "github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
 	fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
@@ -340,13 +339,7 @@ func (s *Service) IsOptimistic(_ context.Context) (bool, error) {
 	}
 	s.headLock.RLock()
 	headRoot := s.head.root
-	headSlot := s.head.slot
-	headOptimistic := s.head.optimistic
 	s.headLock.RUnlock()
-	// we trust the head package for recent head slots, otherwise fallback to forkchoice
-	if headSlot+2 >= s.CurrentSlot() {
-		return headOptimistic, nil
-	}

 	s.cfg.ForkChoiceStore.RLock()
 	defer s.cfg.ForkChoiceStore.RUnlock()
@@ -387,14 +380,6 @@ func (s *Service) InForkchoice(root [32]byte) bool {
 	return s.cfg.ForkChoiceStore.HasNode(root)
 }

-// IsViableForkCheckpoint returns whether the given checkpoint is a checkpoint in any
-// chain known to forkchoice
-func (s *Service) IsViableForCheckpoint(cp *forkchoicetypes.Checkpoint) (bool, error) {
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
-	return s.cfg.ForkChoiceStore.IsViableForCheckpoint(cp)
-}
-
 // IsOptimisticForRoot takes the root as argument instead of the current head
 // and returns true if it is optimistic.
 func (s *Service) IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool, error) {
@@ -499,13 +484,6 @@ func (s *Service) Ancestor(ctx context.Context, root []byte, slot primitives.Slo
 	return ar[:], nil
 }

-// SetOptimisticToInvalid wraps the corresponding method in forkchoice
-func (s *Service) SetOptimisticToInvalid(ctx context.Context, root, parent, lvh [32]byte) ([][32]byte, error) {
-	s.cfg.ForkChoiceStore.Lock()
-	defer s.cfg.ForkChoiceStore.Unlock()
-	return s.cfg.ForkChoiceStore.SetOptimisticToInvalid(ctx, root, parent, lvh)
-}
-
 // SetGenesisTime sets the genesis time of beacon chain.
 func (s *Service) SetGenesisTime(t time.Time) {
 	s.genesisTime = t
--- a/beacon-chain/blockchain/chain_info_test.go
+++ b/beacon-chain/blockchain/chain_info_test.go
@@ -422,12 +422,6 @@ func TestService_IsOptimistic(t *testing.T) {

 	opt, err := c.IsOptimistic(ctx)
 	require.NoError(t, err)
-	require.Equal(t, primitives.Slot(0), c.CurrentSlot())
-	require.Equal(t, false, opt)
-
-	c.SetGenesisTime(time.Now().Add(-time.Second * time.Duration(4*params.BeaconConfig().SecondsPerSlot)))
-	opt, err = c.IsOptimistic(ctx)
-	require.NoError(t, err)
 	require.Equal(t, true, opt)
 }

--- a/beacon-chain/blockchain/error.go
+++ b/beacon-chain/blockchain/error.go
@@ -25,11 +25,8 @@ var (
 	errWSBlockNotFound = errors.New("weak subjectivity root not found in db")
 	// errWSBlockNotFoundInEpoch is returned when a block is not found in the WS cache or DB within epoch.
 	errWSBlockNotFoundInEpoch = errors.New("weak subjectivity root not found in db within epoch")
-	// ErrNotDescendantOfFinalized is returned when a block is not a descendant of the finalized checkpoint
+	// errNotDescendantOfFinalized is returned when a block is not a descendant of the finalized checkpoint
 	ErrNotDescendantOfFinalized = invalidBlock{error: errors.New("not descendant of finalized checkpoint")}
-	// ErrNotCheckpoint is returned when a given checkpoint is not a
-	// checkpoint in any chain known to forkchoice
-	ErrNotCheckpoint = errors.New("not a checkpoint in forkchoice")
 )

 // An invalid block is the block that fails state transition based on the core protocol rules.
@@ -41,15 +38,13 @@ var (
 type invalidBlock struct {
 	invalidAncestorRoots [][32]byte
 	error
-	root          [32]byte
-	lastValidHash [32]byte
+	root [32]byte
 }

 type invalidBlockError interface {
 	Error() string
 	InvalidAncestorRoots() [][32]byte
 	BlockRoot() [32]byte
-	LastValidHash() [32]byte
 }

 // BlockRoot returns the invalid block root.
@@ -57,11 +52,6 @@ func (e invalidBlock) BlockRoot() [32]byte {
 	return e.root
 }

-// LastValidHash returns the last valid hash root.
-func (e invalidBlock) LastValidHash() [32]byte {
-	return e.lastValidHash
-}
-
 // InvalidAncestorRoots returns an optional list of invalid roots of the invalid block which leads up last valid root.
 func (e invalidBlock) InvalidAncestorRoots() [][32]byte {
 	return e.invalidAncestorRoots
@@ -79,19 +69,6 @@ func IsInvalidBlock(e error) bool {
 	return true
 }

-// InvalidBlockLVH returns the invalid block last valid hash root. If the error
-// doesn't have a last valid hash, [32]byte{} is returned.
-func InvalidBlockLVH(e error) [32]byte {
-	if e == nil {
-		return [32]byte{}
-	}
-	d, ok := e.(invalidBlockError)
-	if !ok {
-		return [32]byte{}
-	}
-	return d.LastValidHash()
-}
-
 // InvalidBlockRoot returns the invalid block root. If the error
 // doesn't have an invalid blockroot. [32]byte{} is returned.
 func InvalidBlockRoot(e error) [32]byte {
--- a/beacon-chain/blockchain/execution_engine.go
+++ b/beacon-chain/blockchain/execution_engine.go
@@ -154,7 +154,7 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkcho
 		var pId [8]byte
 		copy(pId[:], payloadID[:])
 		s.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(nextSlot, proposerId, pId, arg.headRoot)
-	} else if hasAttr && payloadID == nil && !features.Get().PrepareAllPayloads {
+	} else if hasAttr && payloadID == nil {
 		log.WithFields(logrus.Fields{
 			"blockHash": fmt.Sprintf("%#x", headPayload.BlockHash()),
 			"slot":      headBlk.Slot(),
@@ -182,24 +182,21 @@ func (s *Service) getPayloadHash(ctx context.Context, root []byte) ([32]byte, er

 // notifyNewPayload signals execution engine on a new payload.
 // It returns true if the EL has returned VALID for the block
-func (s *Service) notifyNewPayload(ctx context.Context, preStateVersion int,
-	preStateHeader interfaces.ExecutionData, blk interfaces.ReadOnlySignedBeaconBlock) (bool, error) {
+func (s *Service) notifyNewPayload(ctx context.Context, postStateVersion int,
+	postStateHeader interfaces.ExecutionData, blk interfaces.ReadOnlySignedBeaconBlock) (bool, error) {
 	ctx, span := trace.StartSpan(ctx, "blockChain.notifyNewPayload")
 	defer span.End()

 	// Execution payload is only supported in Bellatrix and beyond. Pre
 	// merge blocks are never optimistic
-	if blk == nil {
-		return false, errors.New("signed beacon block can't be nil")
-	}
-	if preStateVersion < version.Bellatrix {
+	if blocks.IsPreBellatrixVersion(postStateVersion) {
 		return true, nil
 	}
 	if err := consensusblocks.BeaconBlockIsNil(blk); err != nil {
 		return false, err
 	}
 	body := blk.Block().Body()
-	enabled, err := blocks.IsExecutionEnabledUsingHeader(preStateHeader, body)
+	enabled, err := blocks.IsExecutionEnabledUsingHeader(postStateHeader, body)
 	if err != nil {
 		return false, errors.Wrap(invalidBlock{error: err}, "could not determine if execution is enabled")
 	}
@@ -223,37 +220,35 @@ func (s *Service) notifyNewPayload(ctx context.Context, preStateVersion int,
 		}).Info("Called new payload with optimistic block")
 		return false, nil
 	case execution.ErrInvalidPayloadStatus:
-		lvh := bytesutil.ToBytes32(lastValidHash)
-		return false, invalidBlock{
-			error:         ErrInvalidPayload,
-			lastValidHash: lvh,
+		newPayloadInvalidNodeCount.Inc()
+		root, err := blk.Block().HashTreeRoot()
+		if err != nil {
+			return false, err
 		}
+		invalidRoots, err := s.cfg.ForkChoiceStore.SetOptimisticToInvalid(ctx, root, blk.Block().ParentRoot(), bytesutil.ToBytes32(lastValidHash))
+		if err != nil {
+			return false, err
+		}
+		if err := s.removeInvalidBlockAndState(ctx, invalidRoots); err != nil {
+			return false, err
+		}
+		log.WithFields(logrus.Fields{
+			"slot":                 blk.Block().Slot(),
+			"blockRoot":            fmt.Sprintf("%#x", root),
+			"invalidChildrenCount": len(invalidRoots),
+		}).Warn("Pruned invalid blocks")
+		return false, invalidBlock{
+			invalidAncestorRoots: invalidRoots,
+			error:                ErrInvalidPayload,
+		}
+	case execution.ErrInvalidBlockHashPayloadStatus:
+		newPayloadInvalidNodeCount.Inc()
+		return false, ErrInvalidBlockHashPayloadStatus
 	default:
 		return false, errors.WithMessage(ErrUndefinedExecutionEngineError, err.Error())
 	}
 }

-// reportInvalidBlock deals with the event that an invalid block was detected by the execution layer
-func (s *Service) pruneInvalidBlock(ctx context.Context, root, parentRoot, lvh [32]byte) error {
-	newPayloadInvalidNodeCount.Inc()
-	invalidRoots, err := s.SetOptimisticToInvalid(ctx, root, parentRoot, lvh)
-	if err != nil {
-		return err
-	}
-	if err := s.removeInvalidBlockAndState(ctx, invalidRoots); err != nil {
-		return err
-	}
-	log.WithFields(logrus.Fields{
-		"blockRoot":            fmt.Sprintf("%#x", root),
-		"invalidChildrenCount": len(invalidRoots),
-	}).Warn("Pruned invalid blocks")
-	return invalidBlock{
-		invalidAncestorRoots: invalidRoots,
-		error:                ErrInvalidPayload,
-		lastValidHash:        lvh,
-	}
-}
-
 // 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, headRoot []byte) (bool, payloadattribute.Attributer, primitives.ValidatorIndex) {
--- a/beacon-chain/blockchain/execution_engine_test.go
+++ b/beacon-chain/blockchain/execution_engine_test.go
@@ -525,13 +525,11 @@ func Test_NotifyNewPayload(t *testing.T) {
 		{
 			name:           "phase 0 post state",
 			postState:      phase0State,
-			blk:            altairBlk, // same as phase 0 for this test
 			isValidPayload: true,
 		},
 		{
 			name:           "altair post state",
 			postState:      altairState,
-			blk:            altairBlk,
 			isValidPayload: true,
 		},
 		{
@@ -745,37 +743,6 @@ func Test_NotifyNewPayload_SetOptimisticToValid(t *testing.T) {
 	require.Equal(t, true, validated)
 }

-func Test_reportInvalidBlock(t *testing.T) {
-	params.SetupTestConfigCleanup(t)
-	params.OverrideBeaconConfig(params.MainnetConfig())
-	service, tr := minimalTestService(t)
-	ctx, _, fcs := tr.ctx, tr.db, tr.fcs
-	jcp := &ethpb.Checkpoint{}
-	st, root, err := prepareForkchoiceState(ctx, 0, [32]byte{'A'}, [32]byte{}, [32]byte{'a'}, jcp, jcp)
-	require.NoError(t, err)
-	require.NoError(t, fcs.InsertNode(ctx, st, root))
-	st, root, err = prepareForkchoiceState(ctx, 1, [32]byte{'B'}, [32]byte{'A'}, [32]byte{'b'}, jcp, jcp)
-	require.NoError(t, err)
-	require.NoError(t, fcs.InsertNode(ctx, st, root))
-	st, root, err = prepareForkchoiceState(ctx, 2, [32]byte{'C'}, [32]byte{'B'}, [32]byte{'c'}, jcp, jcp)
-	require.NoError(t, err)
-	require.NoError(t, fcs.InsertNode(ctx, st, root))
-
-	st, root, err = prepareForkchoiceState(ctx, 3, [32]byte{'D'}, [32]byte{'C'}, [32]byte{'d'}, jcp, jcp)
-	require.NoError(t, err)
-	require.NoError(t, fcs.InsertNode(ctx, st, root))
-
-	require.NoError(t, fcs.SetOptimisticToValid(ctx, [32]byte{'A'}))
-	err = service.pruneInvalidBlock(ctx, [32]byte{'D'}, [32]byte{'C'}, [32]byte{'a'})
-	require.Equal(t, IsInvalidBlock(err), true)
-	require.Equal(t, InvalidBlockLVH(err), [32]byte{'a'})
-	invalidRoots := InvalidAncestorRoots(err)
-	require.Equal(t, 3, len(invalidRoots))
-	require.Equal(t, [32]byte{'D'}, invalidRoots[0])
-	require.Equal(t, [32]byte{'C'}, invalidRoots[1])
-	require.Equal(t, [32]byte{'B'}, invalidRoots[2])
-}
-
 func Test_GetPayloadAttribute(t *testing.T) {
 	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx := tr.ctx
--- a/beacon-chain/blockchain/head.go
+++ b/beacon-chain/blockchain/head.go
@@ -47,11 +47,9 @@ func (s *Service) UpdateAndSaveHeadWithBalances(ctx context.Context) error {

 // This defines the current chain service's view of head.
 type head struct {
-	root       [32]byte                             // current head root.
-	block      interfaces.ReadOnlySignedBeaconBlock // current head block.
-	state      state.BeaconState                    // current head state.
-	slot       primitives.Slot                      // the head block slot number
-	optimistic bool                                 // optimistic status when saved head
+	root  [32]byte                             // current head root.
+	block interfaces.ReadOnlySignedBeaconBlock // current head block.
+	state state.BeaconState                    // current head state.
 }

 // This saves head info to the local service cache, it also saves the
@@ -96,10 +94,6 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 		return errors.Wrap(err, "could not get old head root")
 	}
 	oldHeadRoot := bytesutil.ToBytes32(r)
-	isOptimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(newHeadRoot)
-	if err != nil {
-		log.WithError(err).Error("could not check if node is optimistically synced")
-	}
 	if headBlock.Block().ParentRoot() != oldHeadRoot {
 		// A chain re-org occurred, so we fire an event notifying the rest of the services.
 		commonRoot, forkSlot, err := s.cfg.ForkChoiceStore.CommonAncestor(ctx, oldHeadRoot, newHeadRoot)
@@ -131,6 +125,10 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 		reorgDistance.Observe(float64(dis))
 		reorgDepth.Observe(float64(dep))

+		isOptimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(newHeadRoot)
+		if err != nil {
+			return errors.Wrap(err, "could not check if node is optimistically synced")
+		}
 		s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
 			Type: statefeed.Reorg,
 			Data: &ethpbv1.EventChainReorg{
@@ -152,14 +150,7 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 	}

 	// Cache the new head info.
-	newHead := &head{
-		root:       newHeadRoot,
-		block:      headBlock,
-		state:      headState,
-		optimistic: isOptimistic,
-		slot:       headBlock.Block().Slot(),
-	}
-	if err := s.setHead(newHead); err != nil {
+	if err := s.setHead(newHeadRoot, headBlock, headState); err != nil {
 		return errors.Wrap(err, "could not set head")
 	}

@@ -204,22 +195,20 @@ func (s *Service) saveHeadNoDB(ctx context.Context, b interfaces.ReadOnlySignedB
 	return nil
 }

-// This sets head view object which is used to track the head slot, root, block, state and optimistic status
-func (s *Service) setHead(newHead *head) error {
+// This sets head view object which is used to track the head slot, root, block and state.
+func (s *Service) setHead(root [32]byte, block interfaces.ReadOnlySignedBeaconBlock, state state.BeaconState) error {
 	s.headLock.Lock()
 	defer s.headLock.Unlock()

 	// This does a full copy of the block and state.
-	bCp, err := newHead.block.Copy()
+	bCp, err := block.Copy()
 	if err != nil {
 		return err
 	}
 	s.head = &head{
-		root:       newHead.root,
-		block:      bCp,
-		state:      newHead.state.Copy(),
-		optimistic: newHead.optimistic,
-		slot:       newHead.slot,
+		root:  root,
+		block: bCp,
+		state: state.Copy(),
 	}
 	return nil
 }
--- a/beacon-chain/blockchain/head_sync_committee_info.go
+++ b/beacon-chain/blockchain/head_sync_committee_info.go
@@ -53,7 +53,7 @@ func (s *Service) HeadSyncContributionProofDomain(ctx context.Context, slot prim

 // HeadSyncCommitteeIndices returns the sync committee index position using the head state. Input `slot` is taken in consideration
 // where validator's duty for `slot - 1` is used for block inclusion in `slot`. That means when a validator is at epoch boundary
-// across EPOCHS_PER_SYNC_COMMITTEE_PERIOD then the validator will be considered using next period sync committee.
+// across EPOCHS_PER_SYNC_COMMITTEE_PERIOD then the valiator will be considered using next period sync committee.
 //
 // Spec definition:
 // Being assigned to a sync committee for a given slot means that the validator produces and broadcasts signatures for slot - 1 for inclusion in slot.
@@ -157,11 +157,7 @@ func (s *Service) getSyncCommitteeHeadState(ctx context.Context, slot primitives
 		if headState == nil || headState.IsNil() {
 			return nil, errors.New("nil state")
 		}
-		headRoot, err := s.HeadRoot(ctx)
-		if err != nil {
-			return nil, err
-		}
-		headState, err = transition.ProcessSlotsUsingNextSlotCache(ctx, headState, headRoot, slot)
+		headState, err = transition.ProcessSlotsIfPossible(ctx, headState, slot)
 		if err != nil {
 			return nil, err
 		}
--- a/beacon-chain/blockchain/head_sync_committee_info_test.go
+++ b/beacon-chain/blockchain/head_sync_committee_info_test.go
@@ -6,7 +6,6 @@ import (

 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/signing"
-	dbTest "github.com/prysmaticlabs/prysm/v4/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/testing/require"
@@ -16,7 +15,7 @@ import (

 func TestService_HeadSyncCommitteeIndices(t *testing.T) {
 	s, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().TargetCommitteeSize)
-	c := &Service{cfg: &config{BeaconDB: dbTest.SetupDB(t)}}
+	c := &Service{}
 	c.head = &head{state: s}

 	// Current period
@@ -39,7 +38,7 @@ func TestService_HeadSyncCommitteeIndices(t *testing.T) {

 func TestService_headCurrentSyncCommitteeIndices(t *testing.T) {
 	s, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().TargetCommitteeSize)
-	c := &Service{cfg: &config{BeaconDB: dbTest.SetupDB(t)}}
+	c := &Service{}
 	c.head = &head{state: s}

 	// Process slot up to `EpochsPerSyncCommitteePeriod` so it can `ProcessSyncCommitteeUpdates`.
@@ -67,7 +66,7 @@ func TestService_headNextSyncCommitteeIndices(t *testing.T) {

 func TestService_HeadSyncCommitteePubKeys(t *testing.T) {
 	s, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().TargetCommitteeSize)
-	c := &Service{cfg: &config{BeaconDB: dbTest.SetupDB(t)}}
+	c := &Service{}
 	c.head = &head{state: s}

 	// Process slot up to 2 * `EpochsPerSyncCommitteePeriod` so it can run `ProcessSyncCommitteeUpdates` twice.
@@ -82,7 +81,7 @@ func TestService_HeadSyncCommitteePubKeys(t *testing.T) {

 func TestService_HeadSyncCommitteeDomain(t *testing.T) {
 	s, _ := util.DeterministicGenesisStateAltair(t, params.BeaconConfig().TargetCommitteeSize)
-	c := &Service{cfg: &config{BeaconDB: dbTest.SetupDB(t)}}
+	c := &Service{}
 	c.head = &head{state: s}

 	wanted, err := signing.Domain(s.Fork(), slots.ToEpoch(s.Slot()), params.BeaconConfig().DomainSyncCommittee, s.GenesisValidatorsRoot())
--- a/beacon-chain/blockchain/log.go
+++ b/beacon-chain/blockchain/log.go
@@ -53,7 +53,7 @@ func logStateTransitionData(b interfaces.ReadOnlyBeaconBlock) error {
 		log = log.WithField("payloadHash", fmt.Sprintf("%#x", bytesutil.Trunc(p.BlockHash())))
 		txs, err := p.Transactions()
 		switch {
-		case errors.Is(err, consensus_types.ErrUnsupportedField):
+		case errors.Is(err, consensus_types.ErrUnsupportedGetter):
 		case err != nil:
 			return err
 		default:
@@ -120,7 +120,7 @@ func logPayload(block interfaces.ReadOnlyBeaconBlock) error {
 	fields := logrus.Fields{
 		"blockHash":   fmt.Sprintf("%#x", bytesutil.Trunc(payload.BlockHash())),
 		"parentHash":  fmt.Sprintf("%#x", bytesutil.Trunc(payload.ParentHash())),
-		"blockNumber": payload.BlockNumber(),
+		"blockNumber": payload.BlockNumber,
 		"gasUtilized": fmt.Sprintf("%.2f", gasUtilized),
 	}
 	if block.Version() >= version.Capella {
--- a/beacon-chain/blockchain/metrics.go
+++ b/beacon-chain/blockchain/metrics.go
@@ -172,15 +172,11 @@ var (
 	})
 	onBlockProcessingTime = promauto.NewSummary(prometheus.SummaryOpts{
 		Name: "on_block_processing_milliseconds",
-		Help: "Total time in milliseconds to complete a call to postBlockProcess()",
+		Help: "Total time in milliseconds to complete a call to onBlock()",
 	})
 	stateTransitionProcessingTime = promauto.NewSummary(prometheus.SummaryOpts{
 		Name: "state_transition_processing_milliseconds",
-		Help: "Total time to call a state transition in validateStateTransition()",
-	})
-	chainServiceProcessingTime = promauto.NewSummary(prometheus.SummaryOpts{
-		Name: "chain_service_processing_milliseconds",
-		Help: "Total time to call a chain service in ReceiveBlock()",
+		Help: "Total time to call a state transition in onBlock()",
 	})
 	processAttsElapsedTime = promauto.NewHistogram(
 		prometheus.HistogramOpts{
@@ -250,45 +246,40 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 	slashingBalance := uint64(0)
 	slashingEffectiveBalance := uint64(0)

-	for i := 0; i < postState.NumValidators(); i++ {
-		validator, err := postState.ValidatorAtIndexReadOnly(primitives.ValidatorIndex(i))
-		if err != nil {
-			log.WithError(err).Error("Could not load validator")
-			continue
-		}
+	for i, validator := range postState.Validators() {
 		bal, err := postState.BalanceAtIndex(primitives.ValidatorIndex(i))
 		if err != nil {
 			log.WithError(err).Error("Could not load validator balance")
 			continue
 		}
-		if validator.Slashed() {
-			if currentEpoch < validator.ExitEpoch() {
+		if validator.Slashed {
+			if currentEpoch < validator.ExitEpoch {
 				slashingInstances++
 				slashingBalance += bal
-				slashingEffectiveBalance += validator.EffectiveBalance()
+				slashingEffectiveBalance += validator.EffectiveBalance
 			} else {
 				slashedInstances++
 			}
 			continue
 		}
-		if validator.ExitEpoch() != params.BeaconConfig().FarFutureEpoch {
-			if currentEpoch < validator.ExitEpoch() {
+		if validator.ExitEpoch != params.BeaconConfig().FarFutureEpoch {
+			if currentEpoch < validator.ExitEpoch {
 				exitingInstances++
 				exitingBalance += bal
-				exitingEffectiveBalance += validator.EffectiveBalance()
+				exitingEffectiveBalance += validator.EffectiveBalance
 			} else {
 				exitedInstances++
 			}
 			continue
 		}
-		if currentEpoch < validator.ActivationEpoch() {
+		if currentEpoch < validator.ActivationEpoch {
 			pendingInstances++
 			pendingBalance += bal
 			continue
 		}
 		activeInstances++
 		activeBalance += bal
-		activeEffectiveBalance += validator.EffectiveBalance()
+		activeEffectiveBalance += validator.EffectiveBalance
 	}
 	activeInstances += exitingInstances + slashingInstances
 	activeBalance += exitingBalance + slashingBalance
--- a/beacon-chain/blockchain/options.go
+++ b/beacon-chain/blockchain/options.go
@@ -172,10 +172,3 @@ func WithClockSynchronizer(gs *startup.ClockSynchronizer) Option {
 		return nil
 	}
 }
-
-func WithSyncComplete(c chan struct{}) Option {
-	return func(s *Service) error {
-		s.syncComplete = c
-		return nil
-	}
-}
--- a/beacon-chain/blockchain/process_attestation_helpers.go
+++ b/beacon-chain/blockchain/process_attestation_helpers.go
@@ -8,7 +8,6 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v4/async"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition"
-	forkchoicetypes "github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
@@ -19,17 +18,7 @@ import (
 )

 // getAttPreState retrieves the att pre state by either from the cache or the DB.
-func (s *Service) getAttPreState(ctx context.Context, c *ethpb.Checkpoint) (state.ReadOnlyBeaconState, error) {
-	// If the attestation is recent and canonical we can use the head state to compute the shuffling.
-	headEpoch := slots.ToEpoch(s.HeadSlot())
-	if c.Epoch == headEpoch {
-		targetSlot, err := s.cfg.ForkChoiceStore.Slot([32]byte(c.Root))
-		if err == nil && slots.ToEpoch(targetSlot)+1 >= headEpoch {
-			if s.cfg.ForkChoiceStore.IsCanonical([32]byte(c.Root)) {
-				return s.HeadStateReadOnly(ctx)
-			}
-		}
-	}
+func (s *Service) getAttPreState(ctx context.Context, c *ethpb.Checkpoint) (state.BeaconState, error) {
 	// Use a multilock to allow scoped holding of a mutex by a checkpoint root + epoch
 	// allowing us to behave smarter in terms of how this function is used concurrently.
 	epochKey := strconv.FormatUint(uint64(c.Epoch), 10 /* base 10 */)
@@ -43,36 +32,7 @@ func (s *Service) getAttPreState(ctx context.Context, c *ethpb.Checkpoint) (stat
 	if cachedState != nil && !cachedState.IsNil() {
 		return cachedState, nil
 	}
-	// Try the next slot cache for the early epoch calls, this should mostly have been covered already
-	// but is cheap
-	slot, err := slots.EpochStart(c.Epoch)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not compute epoch start")
-	}
-	cachedState = transition.NextSlotState(c.Root, slot)
-	if cachedState != nil && !cachedState.IsNil() {
-		if cachedState.Slot() != slot {
-			cachedState, err = transition.ProcessSlots(ctx, cachedState, slot)
-			if err != nil {
-				return nil, errors.Wrap(err, "could not process slots")
-			}
-		}
-		if err := s.checkpointStateCache.AddCheckpointState(c, cachedState); err != nil {
-			return nil, errors.Wrap(err, "could not save checkpoint state to cache")
-		}
-		return cachedState, nil
-	}

-	// Do not process attestations for old non viable checkpoints otherwise
-	ok, err := s.cfg.ForkChoiceStore.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: [32]byte(c.Root), Epoch: c.Epoch})
-	if err != nil {
-		return nil, errors.Wrap(err, "could not check checkpoint condition in forkchoice")
-	}
-	if !ok {
-		return nil, errors.Wrap(ErrNotCheckpoint, fmt.Sprintf("epoch %d root %#x", c.Epoch, c.Root))
-	}
-
-	// Fallback to state regeneration.
 	baseState, err := s.cfg.StateGen.StateByRoot(ctx, bytesutil.ToBytes32(c.Root))
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get pre state for epoch %d", c.Epoch)
--- a/beacon-chain/blockchain/process_attestation_test.go
+++ b/beacon-chain/blockchain/process_attestation_test.go
@@ -27,20 +27,11 @@ func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
 	blkWithoutState := util.NewBeaconBlock()
 	blkWithoutState.Block.Slot = 0
 	util.SaveBlock(t, ctx, beaconDB, blkWithoutState)
-
-	cp := &ethpb.Checkpoint{}
-	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, cp, cp)
+	BlkWithOutStateRoot, err := blkWithoutState.Block.HashTreeRoot()
 	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))

 	blkWithStateBadAtt := util.NewBeaconBlock()
 	blkWithStateBadAtt.Block.Slot = 1
-	r, err := blkWithStateBadAtt.Block.HashTreeRoot()
-	require.NoError(t, err)
-	cp = &ethpb.Checkpoint{Root: r[:]}
-	st, blkRoot, err = prepareForkchoiceState(ctx, blkWithStateBadAtt.Block.Slot, r, [32]byte{}, params.BeaconConfig().ZeroHash, cp, cp)
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 	util.SaveBlock(t, ctx, beaconDB, blkWithStateBadAtt)
 	BlkWithStateBadAttRoot, err := blkWithStateBadAtt.Block.HashTreeRoot()
 	require.NoError(t, err)
@@ -51,7 +42,7 @@ func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, BlkWithStateBadAttRoot))

 	blkWithValidState := util.NewBeaconBlock()
-	blkWithValidState.Block.Slot = 32
+	blkWithValidState.Block.Slot = 2
 	util.SaveBlock(t, ctx, beaconDB, blkWithValidState)

 	blkWithValidStateRoot, err := blkWithValidState.Block.HashTreeRoot()
@@ -66,10 +57,6 @@ func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, blkWithValidStateRoot))

-	service.head = &head{
-		state: st,
-	}
-
 	tests := []struct {
 		name      string
 		a         *ethpb.Attestation
@@ -80,6 +67,11 @@ func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
 			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,
@@ -168,9 +160,6 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'A'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: bytesutil.PadTo([]byte{'A'}, fieldparams.RootLength)}))

-	st, root, err := prepareForkchoiceState(ctx, 1, [32]byte(cp1.Root), [32]byte{}, [32]byte{'R'}, cp1, cp1)
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
 	s1, err := service.getAttPreState(ctx, cp1)
 	require.NoError(t, err)
 	assert.Equal(t, 1*params.BeaconConfig().SlotsPerEpoch, s1.Slot(), "Unexpected state slot")
@@ -178,17 +167,8 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	cp2 := &ethpb.Checkpoint{Epoch: 2, Root: bytesutil.PadTo([]byte{'B'}, fieldparams.RootLength)}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'B'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: bytesutil.PadTo([]byte{'B'}, fieldparams.RootLength)}))
-
 	s2, err := service.getAttPreState(ctx, cp2)
-	require.ErrorContains(t, "epoch 2 root 0x4200000000000000000000000000000000000000000000000000000000000000: not a checkpoint in forkchoice", err)
-
-	st, root, err = prepareForkchoiceState(ctx, 33, [32]byte(cp2.Root), [32]byte(cp1.Root), [32]byte{'R'}, cp2, cp2)
 	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
-
-	s2, err = service.getAttPreState(ctx, cp2)
-	require.NoError(t, err)
-
 	assert.Equal(t, 2*params.BeaconConfig().SlotsPerEpoch, s2.Slot(), "Unexpected state slot")

 	s1, err = service.getAttPreState(ctx, cp1)
@@ -207,10 +187,6 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	cp3 := &ethpb.Checkpoint{Epoch: 1, Root: bytesutil.PadTo([]byte{'C'}, fieldparams.RootLength)}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'C'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: bytesutil.PadTo([]byte{'C'}, fieldparams.RootLength)}))
-	st, root, err = prepareForkchoiceState(ctx, 31, [32]byte(cp3.Root), [32]byte(cp2.Root), [32]byte{'P'}, cp2, cp2)
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
-
 	s3, err := service.getAttPreState(ctx, cp3)
 	require.NoError(t, err)
 	assert.Equal(t, s.Slot(), s3.Slot(), "Unexpected state slot")
@@ -219,18 +195,11 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 func TestStore_UpdateCheckpointState(t *testing.T) {
 	service, tr := minimalTestService(t)
 	ctx := tr.ctx
-	baseState, _ := util.DeterministicGenesisState(t, 1)

 	epoch := primitives.Epoch(1)
-	blk := util.NewBeaconBlock()
-	r1, err := blk.Block.HashTreeRoot()
-	require.NoError(t, err)
-	checkpoint := &ethpb.Checkpoint{Epoch: epoch, Root: r1[:]}
+	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)))
-	st, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r1, [32]byte{}, params.BeaconConfig().ZeroHash, checkpoint, checkpoint)
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, r1))
 	returned, err := service.getAttPreState(ctx, checkpoint)
 	require.NoError(t, err)
 	assert.Equal(t, params.BeaconConfig().SlotsPerEpoch.Mul(uint64(checkpoint.Epoch)), returned.Slot(), "Incorrectly returned base state")
@@ -240,16 +209,8 @@ func TestStore_UpdateCheckpointState(t *testing.T) {
 	assert.Equal(t, returned.Slot(), cached.Slot(), "State should have been cached")

 	epoch = 2
-	blk = util.NewBeaconBlock()
-	blk.Block.Slot = 64
-	r2, err := blk.Block.HashTreeRoot()
-	require.NoError(t, err)
-	newCheckpoint := &ethpb.Checkpoint{Epoch: epoch, Root: r2[:]}
+	newCheckpoint := &ethpb.Checkpoint{Epoch: epoch, Root: bytesutil.PadTo([]byte("bye"), fieldparams.RootLength)}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(newCheckpoint.Root)))
-	st, blkRoot, err = prepareForkchoiceState(ctx, blk.Block.Slot, r2, r1, params.BeaconConfig().ZeroHash, newCheckpoint, newCheckpoint)
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, r2))
 	returned, err = service.getAttPreState(ctx, newCheckpoint)
 	require.NoError(t, err)
 	s, err := slots.EpochStart(newCheckpoint.Epoch)
@@ -328,22 +289,3 @@ func TestVerifyBeaconBlock_OK(t *testing.T) {

 	assert.NoError(t, service.verifyBeaconBlock(ctx, d), "Did not receive the wanted error")
 }
-
-func TestGetAttPreState_HeadState(t *testing.T) {
-	service, tr := minimalTestService(t)
-	ctx := tr.ctx
-	baseState, _ := util.DeterministicGenesisState(t, 1)
-
-	epoch := primitives.Epoch(1)
-	blk := util.NewBeaconBlock()
-	r1, err := blk.Block.HashTreeRoot()
-	require.NoError(t, err)
-	checkpoint := &ethpb.Checkpoint{Epoch: epoch, Root: r1[:]}
-	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(checkpoint.Root)))
-	require.NoError(t, transition.UpdateNextSlotCache(ctx, checkpoint.Root, baseState))
-	_, err = service.getAttPreState(ctx, checkpoint)
-	require.NoError(t, err)
-	st, err := service.checkpointStateCache.StateByCheckpoint(checkpoint)
-	require.NoError(t, err)
-	require.Equal(t, params.BeaconConfig().SlotsPerEpoch, st.Slot())
-}
--- a/beacon-chain/blockchain/process_block.go
+++ b/beacon-chain/blockchain/process_block.go
@@ -22,6 +22,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/crypto/bls"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v4/monitoring/tracing"
+	ethpbv1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1/attestation"
 	"github.com/prysmaticlabs/prysm/v4/runtime/version"
@@ -39,11 +40,59 @@ const depositDeadline = 20 * time.Second
 // This defines size of the upper bound for initial sync block cache.
 var initialSyncBlockCacheSize = uint64(2 * params.BeaconConfig().SlotsPerEpoch)

-// postBlockProcess is called when a gossip block is received. This function performs
-// several duties most importantly informing the engine if head was updated,
-// saving the new head information to the blockchain package and
-// handling attestations, slashings and similar included in the block.
-func (s *Service) postBlockProcess(ctx context.Context, signed interfaces.ReadOnlySignedBeaconBlock, blockRoot [32]byte, postState state.BeaconState, isValidPayload bool) error {
+// onBlock is called when a gossip block is received. It runs regular state transition on the block.
+// The block's signing root should be computed before calling this method to avoid redundant
+// computation in this method and methods it calls into.
+//
+// Spec pseudocode definition:
+//
+//	def on_block(store: Store, signed_block: ReadOnlySignedBeaconBlock) -> 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 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 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
+//
+//	         # 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.ReadOnlySignedBeaconBlock, blockRoot [32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.onBlock")
 	defer span.End()
 	if err := consensusblocks.BeaconBlockIsNil(signed); err != nil {
@@ -52,7 +101,52 @@ func (s *Service) postBlockProcess(ctx context.Context, signed interfaces.ReadOn
 	startTime := time.Now()
 	b := signed.Block()

-	if err := s.cfg.ForkChoiceStore.InsertNode(ctx, postState, blockRoot); err != nil {
+	preState, err := s.getBlockPreState(ctx, b)
+	if err != nil {
+		return err
+	}
+
+	// Verify that the parent block is in forkchoice
+	if !s.cfg.ForkChoiceStore.HasNode(b.ParentRoot()) {
+		return ErrNotDescendantOfFinalized
+	}
+
+	// Save current justified and finalized epochs for future use.
+	currStoreJustifiedEpoch := s.cfg.ForkChoiceStore.JustifiedCheckpoint().Epoch
+	currStoreFinalizedEpoch := s.cfg.ForkChoiceStore.FinalizedCheckpoint().Epoch
+	preStateFinalizedEpoch := preState.FinalizedCheckpoint().Epoch
+	preStateJustifiedEpoch := preState.CurrentJustifiedCheckpoint().Epoch
+
+	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
+	if err != nil {
+		return err
+	}
+	stateTransitionStartTime := time.Now()
+	postState, err := transition.ExecuteStateTransition(ctx, preState, signed)
+	if err != nil {
+		return invalidBlock{error: err}
+	}
+	stateTransitionProcessingTime.Observe(float64(time.Since(stateTransitionStartTime).Milliseconds()))
+
+	postStateVersion, postStateHeader, err := getStateVersionAndPayload(postState)
+	if err != nil {
+		return err
+	}
+	isValidPayload, err := s.notifyNewPayload(ctx, postStateVersion, postStateHeader, signed)
+	if err != nil {
+		return errors.Wrap(err, "could not validate new payload")
+	}
+	if isValidPayload {
+		if err := s.validateMergeTransitionBlock(ctx, preStateVersion, preStateHeader, signed); err != nil {
+			return err
+		}
+	}
+
+	if err := s.savePostStateInfo(ctx, blockRoot, signed, postState); err != nil {
+		return err
+	}
+
+	if err := s.insertBlockToForkchoiceStore(ctx, signed.Block(), blockRoot, postState); err != nil {
 		return errors.Wrapf(err, "could not insert block %d to fork choice store", signed.Block().Slot())
 	}
 	if err := s.handleBlockAttestations(ctx, signed.Block(), postState); err != nil {
@@ -66,6 +160,34 @@ func (s *Service) postBlockProcess(ctx context.Context, signed interfaces.ReadOn
 		}
 	}

+	// If slasher is configured, forward the attestations in the block via
+	// an event feed for processing.
+	if features.Get().EnableSlasher {
+		// Feed the indexed attestation to slasher if enabled. This action
+		// is done in the background to avoid adding more load to this critical code path.
+		go func() {
+			// Using a different context to prevent timeouts as this operation can be expensive
+			// and we want to avoid affecting the critical code path.
+			ctx := context.TODO()
+			for _, att := range signed.Block().Body().Attestations() {
+				committee, err := helpers.BeaconCommitteeFromState(ctx, preState, att.Data.Slot, att.Data.CommitteeIndex)
+				if err != nil {
+					log.WithError(err).Error("Could not get attestation committee")
+					tracing.AnnotateError(span, err)
+					return
+				}
+				indexedAtt, err := attestation.ConvertToIndexed(ctx, att, committee)
+				if err != nil {
+					log.WithError(err).Error("Could not convert to indexed attestation")
+					tracing.AnnotateError(span, err)
+					return
+				}
+				s.cfg.SlasherAttestationsFeed.Send(indexedAtt)
+			}
+		}()
+	}
+
+	justified := s.cfg.ForkChoiceStore.JustifiedCheckpoint()
 	start := time.Now()
 	headRoot, err := s.cfg.ForkChoiceStore.Head(ctx)
 	if err != nil {
@@ -118,8 +240,52 @@ func (s *Service) postBlockProcess(ctx context.Context, signed interfaces.ReadOn
 		},
 	})

+	// Save justified check point to db.
+	postStateJustifiedEpoch := postState.CurrentJustifiedCheckpoint().Epoch
+	if justified.Epoch > currStoreJustifiedEpoch || (justified.Epoch == postStateJustifiedEpoch && justified.Epoch > preStateJustifiedEpoch) {
+		if err := s.cfg.BeaconDB.SaveJustifiedCheckpoint(ctx, &ethpb.Checkpoint{
+			Epoch: justified.Epoch, Root: justified.Root[:],
+		}); err != nil {
+			return err
+		}
+	}
+
+	// Save finalized check point to db and more.
+	postStateFinalizedEpoch := postState.FinalizedCheckpoint().Epoch
+	finalized := s.cfg.ForkChoiceStore.FinalizedCheckpoint()
+	if finalized.Epoch > currStoreFinalizedEpoch || (finalized.Epoch == postStateFinalizedEpoch && finalized.Epoch > preStateFinalizedEpoch) {
+		if err := s.updateFinalized(ctx, &ethpb.Checkpoint{Epoch: finalized.Epoch, Root: finalized.Root[:]}); err != nil {
+			return err
+		}
+		isOptimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(finalized.Root)
+		if err != nil {
+			return errors.Wrap(err, "could not check if node is optimistically synced")
+		}
+		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[:],
+					ExecutionOptimistic: isOptimistic,
+				},
+			})
+
+			// Use a custom deadline here, since this method runs asynchronously.
+			// We ignore the parent method's context and instead create a new one
+			// with a custom deadline, therefore using the background context instead.
+			depCtx, cancel := context.WithTimeout(context.Background(), depositDeadline)
+			defer cancel()
+			if err := s.insertFinalizedDeposits(depCtx, finalized.Root); err != nil {
+				log.WithError(err).Error("Could not insert finalized deposits.")
+			}
+		}()
+	}
 	defer reportAttestationInclusion(b)
-	if err := s.handleEpochBoundary(ctx, postState, blockRoot[:]); err != nil {
+	if err := s.handleEpochBoundary(ctx, postState); err != nil {
 		return err
 	}
 	onBlockProcessingTime.Observe(float64(time.Since(startTime).Milliseconds()))
@@ -243,7 +409,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.ReadOnlySi
 			postVersionAndHeaders[i].version,
 			postVersionAndHeaders[i].header, b)
 		if err != nil {
-			return s.handleInvalidExecutionError(ctx, err, blockRoots[i], b.Block().ParentRoot())
+			return err
 		}
 		if isValidPayload {
 			if err := s.validateMergeTransitionBlock(ctx, preVersionAndHeaders[i].version,
@@ -317,14 +483,14 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.ReadOnlySi
 }

 // Epoch boundary bookkeeping such as logging epoch summaries.
-func (s *Service) handleEpochBoundary(ctx context.Context, postState state.BeaconState, blockRoot []byte) error {
+func (s *Service) handleEpochBoundary(ctx context.Context, postState state.BeaconState) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.handleEpochBoundary")
 	defer span.End()

 	var err error
 	if postState.Slot()+1 == s.nextEpochBoundarySlot {
 		copied := postState.Copy()
-		copied, err := transition.ProcessSlotsUsingNextSlotCache(ctx, copied, blockRoot, copied.Slot()+1)
+		copied, err := transition.ProcessSlots(ctx, copied, copied.Slot()+1)
 		if err != nil {
 			return err
 		}
@@ -332,20 +498,9 @@ func (s *Service) handleEpochBoundary(ctx context.Context, postState state.Beaco
 		if err := helpers.UpdateCommitteeCache(ctx, copied, coreTime.CurrentEpoch(copied)); err != nil {
 			return err
 		}
-		e := coreTime.CurrentEpoch(copied)
-		if err := helpers.UpdateProposerIndicesInCache(ctx, copied, e); err != nil {
+		if err := helpers.UpdateProposerIndicesInCache(ctx, copied); err != nil {
 			return err
 		}
-		go func() {
-			// Use a custom deadline here, since this method runs asynchronously.
-			// We ignore the parent method's context and instead create a new one
-			// with a custom deadline, therefore using the background context instead.
-			slotCtx, cancel := context.WithTimeout(context.Background(), slotDeadline)
-			defer cancel()
-			if err := helpers.UpdateProposerIndicesInCache(slotCtx, copied, e+1); err != nil {
-				log.WithError(err).Warn("Failed to cache next epoch proposers")
-			}
-		}()
 	} else if postState.Slot() >= s.nextEpochBoundarySlot {
 		s.nextEpochBoundarySlot, err = slots.EpochStart(coreTime.NextEpoch(postState))
 		if err != nil {
@@ -357,7 +512,7 @@ func (s *Service) handleEpochBoundary(ctx context.Context, postState state.Beaco
 		if err := helpers.UpdateCommitteeCache(ctx, postState, coreTime.CurrentEpoch(postState)); err != nil {
 			return err
 		}
-		if err := helpers.UpdateProposerIndicesInCache(ctx, postState, coreTime.CurrentEpoch(postState)); err != nil {
+		if err := helpers.UpdateProposerIndicesInCache(ctx, postState); err != nil {
 			return err
 		}

@@ -369,9 +524,27 @@ func (s *Service) handleEpochBoundary(ctx context.Context, postState state.Beaco
 			return err
 		}
 	}
+
 	return nil
 }

+// This feeds in the block to fork choice store. It's allows fork choice store
+// to gain information on the most current chain.
+func (s *Service) insertBlockToForkchoiceStore(ctx context.Context, blk interfaces.ReadOnlyBeaconBlock, root [32]byte, st state.BeaconState) error {
+	ctx, span := trace.StartSpan(ctx, "blockChain.insertBlockToForkchoiceStore")
+	defer span.End()
+
+	if !s.cfg.ForkChoiceStore.HasNode(blk.ParentRoot()) {
+		fCheckpoint := st.FinalizedCheckpoint()
+		jCheckpoint := st.CurrentJustifiedCheckpoint()
+		if err := s.fillInForkChoiceMissingBlocks(ctx, blk, fCheckpoint, jCheckpoint); err != nil {
+			return err
+		}
+	}
+
+	return s.cfg.ForkChoiceStore.InsertNode(ctx, st, root)
+}
+
 // This feeds in the attestations included in the block to fork choice store. It's allows fork choice store
 // to gain information on the most current chain.
 func (s *Service) handleBlockAttestations(ctx context.Context, blk interfaces.ReadOnlyBeaconBlock, st state.BeaconState) error {
@@ -478,23 +651,26 @@ func (s *Service) validateMergeTransitionBlock(ctx context.Context, stateVersion

 // This routine checks if there is a cached proposer payload ID available for the next slot proposer.
 // If there is not, it will call forkchoice updated with the correct payload attribute then cache the payload ID.
-func (s *Service) runLateBlockTasks() {
-	if err := s.waitForSync(); err != nil {
-		log.WithError(err).Error("failed to wait for initial sync")
-		return
-	}
-
-	attThreshold := params.BeaconConfig().SecondsPerSlot / 3
-	ticker := slots.NewSlotTickerWithOffset(s.genesisTime, time.Duration(attThreshold)*time.Second, params.BeaconConfig().SecondsPerSlot)
-	for {
-		select {
-		case <-ticker.C():
-			s.lateBlockTasks(s.ctx)
-		case <-s.ctx.Done():
-			log.Debug("Context closed, exiting routine")
+func (s *Service) spawnLateBlockTasksLoop() {
+	go func() {
+		_, err := s.clockWaiter.WaitForClock(s.ctx)
+		if err != nil {
+			log.WithError(err).Error("spawnLateBlockTasksLoop encountered an error waiting for initialization")
 			return
 		}
-	}
+		attThreshold := params.BeaconConfig().SecondsPerSlot / 3
+		ticker := slots.NewSlotTickerWithOffset(s.genesisTime, time.Duration(attThreshold)*time.Second, params.BeaconConfig().SecondsPerSlot)
+		for {
+			select {
+			case <-ticker.C():
+				s.lateBlockTasks(s.ctx)
+
+			case <-s.ctx.Done():
+				log.Debug("Context closed, exiting routine")
+				return
+			}
+		}
+	}()
 }

 // lateBlockTasks  is called 4 seconds into the slot and performs tasks
@@ -509,26 +685,12 @@ func (s *Service) lateBlockTasks(ctx context.Context) {
 		Type: statefeed.MissedSlot,
 	})

-	headRoot := s.headRoot()
-	headState := s.headState(ctx)
-	lastRoot, lastState := transition.LastCachedState()
-	if lastState == nil {
-		lastRoot, lastState = headRoot[:], headState
-	}
-	// Copy all the field tries in our cached state in the event of late
-	// blocks.
-	lastState.CopyAllTries()
-	if err := transition.UpdateNextSlotCache(ctx, lastRoot, lastState); err != nil {
-		log.WithError(err).Debug("could not update next slot state cache")
-	}
-
 	// 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 && !features.Get().PrepareAllPayloads) || id != [8]byte{} {
 		return
 	}
-
 	s.headLock.RLock()
 	headBlock, err := s.headBlock()
 	if err != nil {
@@ -536,6 +698,8 @@ func (s *Service) lateBlockTasks(ctx context.Context) {
 		log.WithError(err).Debug("could not perform late block tasks: failed to retrieve head block")
 		return
 	}
+	headRoot := s.headRoot()
+	headState := s.headState(ctx)
 	s.headLock.RUnlock()
 	_, err = s.notifyForkchoiceUpdate(ctx, &notifyForkchoiceUpdateArg{
 		headState: headState,
@@ -545,21 +709,11 @@ func (s *Service) lateBlockTasks(ctx context.Context) {
 	if err != nil {
 		log.WithError(err).Debug("could not perform late block tasks: failed to update forkchoice with engine")
 	}
-}
-
-// waitForSync blocks until the node is synced to the head.
-func (s *Service) waitForSync() error {
-	select {
-	case <-s.syncComplete:
-		return nil
-	case <-s.ctx.Done():
-		return errors.New("context closed, exiting goroutine")
+	lastRoot, lastState := transition.LastCachedState()
+	if lastState == nil {
+		lastRoot, lastState = headRoot[:], headState
+	}
+	if err = transition.UpdateNextSlotCache(ctx, lastRoot, lastState); err != nil {
+		log.WithError(err).Debug("could not update next slot state cache")
 	}
 }
-
-func (s *Service) handleInvalidExecutionError(ctx context.Context, err error, blockRoot [32]byte, parentRoot [32]byte) error {
-	if IsInvalidBlock(err) && InvalidBlockLVH(err) != [32]byte{} {
-		return s.pruneInvalidBlock(ctx, blockRoot, parentRoot, InvalidBlockLVH(err))
-	}
-	return err
-}
--- a/beacon-chain/blockchain/process_block_helpers.go
+++ b/beacon-chain/blockchain/process_block_helpers.go
@@ -14,7 +14,6 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	mathutil "github.com/prysmaticlabs/prysm/v4/math"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v4/time"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
 	"go.opencensus.io/trace"
 )
@@ -210,44 +209,35 @@ func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, blk interfa
 	return s.cfg.ForkChoiceStore.InsertChain(ctx, pendingNodes)
 }

-// inserts finalized deposits into our finalized deposit trie, needs to be
-// called in the background
-func (s *Service) insertFinalizedDeposits(ctx context.Context, fRoot [32]byte) {
+// inserts finalized deposits into our finalized deposit trie.
+func (s *Service) insertFinalizedDeposits(ctx context.Context, fRoot [32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.insertFinalizedDeposits")
 	defer span.End()
-	startTime := time.Now()

 	// Update deposit cache.
 	finalizedState, err := s.cfg.StateGen.StateByRoot(ctx, fRoot)
 	if err != nil {
-		log.WithError(err).Error("could not fetch finalized state")
-		return
+		return errors.Wrap(err, "could not fetch finalized state")
 	}
 	// We update the cache up to the last deposit index in the finalized block's state.
 	// We can be confident that these deposits will be included in some block
 	// because the Eth1 follow distance makes such long-range reorgs extremely unlikely.
 	eth1DepositIndex, err := mathutil.Int(finalizedState.Eth1DepositIndex())
 	if err != nil {
-		log.WithError(err).Error("could not cast eth1 deposit index")
-		return
+		return errors.Wrap(err, "could not cast eth1 deposit index")
 	}
 	// The deposit index in the state is always the index of the next deposit
 	// to be included(rather than the last one to be processed). This was most likely
 	// done as the state cannot represent signed integers.
-	finalizedEth1DepIdx := eth1DepositIndex - 1
-	if err = s.cfg.DepositCache.InsertFinalizedDeposits(ctx, int64(finalizedEth1DepIdx)); err != nil {
-		log.WithError(err).Error("could not insert finalized deposits")
-		return
+	eth1DepositIndex -= 1
+	if err = s.cfg.DepositCache.InsertFinalizedDeposits(ctx, int64(eth1DepositIndex)); err != nil {
+		return err
 	}
 	// Deposit proofs are only used during state transition and can be safely removed to save space.
-	if err = s.cfg.DepositCache.PruneProofs(ctx, int64(finalizedEth1DepIdx)); err != nil {
-		log.WithError(err).Error("could not prune deposit proofs")
+	if err = s.cfg.DepositCache.PruneProofs(ctx, int64(eth1DepositIndex)); err != nil {
+		return errors.Wrap(err, "could not prune deposit proofs")
 	}
-	// Prune deposits which have already been finalized, the below method prunes all pending deposits (non-inclusive) up
-	// to the provided eth1 deposit index.
-	s.cfg.DepositCache.PrunePendingDeposits(ctx, int64(eth1DepositIndex)) // lint:ignore uintcast -- Deposit index should not exceed int64 in your lifetime.
-
-	log.WithField("duration", time.Since(startTime).String()).Debug("Finalized deposit insertion completed")
+	return nil
 }

 // This ensures that the input root defaults to using genesis root instead of zero hashes. This is needed for handling
--- a/beacon-chain/blockchain/process_block_test.go
+++ b/beacon-chain/blockchain/process_block_test.go
@@ -41,6 +41,103 @@ import (
 	logTest "github.com/sirupsen/logrus/hooks/test"
 )

+func TestStore_OnBlock(t *testing.T) {
+	service, tr := minimalTestService(t)
+	ctx, beaconDB, fcs := tr.ctx, tr.db, tr.fcs
+
+	var genesisStateRoot [32]byte
+	genesis := blocks.NewGenesisBlock(genesisStateRoot[:])
+	util.SaveBlock(t, ctx, beaconDB, genesis)
+	validGenesisRoot, err := genesis.Block.HashTreeRoot()
+	require.NoError(t, err)
+	st, err := util.NewBeaconState()
+	require.NoError(t, err)
+	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, st.Copy(), validGenesisRoot))
+	ojc := &ethpb.Checkpoint{}
+	stfcs, root, err := prepareForkchoiceState(ctx, 0, validGenesisRoot, [32]byte{}, [32]byte{}, ojc, ojc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, stfcs, root))
+	roots, err := blockTree1(t, beaconDB, validGenesisRoot[:])
+	require.NoError(t, err)
+	random := util.NewBeaconBlock()
+	random.Block.Slot = 1
+	random.Block.ParentRoot = validGenesisRoot[:]
+	util.SaveBlock(t, ctx, beaconDB, random)
+	randomParentRoot, err := random.Block.HashTreeRoot()
+	assert.NoError(t, err)
+
+	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Slot: st.Slot(), Root: randomParentRoot[:]}))
+	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, st.Copy(), randomParentRoot))
+	randomParentRoot2 := roots[1]
+	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Slot: st.Slot(), Root: randomParentRoot2}))
+	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, st.Copy(), bytesutil.ToBytes32(randomParentRoot2)))
+	stfcs, root, err = prepareForkchoiceState(ctx, 2, bytesutil.ToBytes32(randomParentRoot2),
+		validGenesisRoot, [32]byte{'r'}, ojc, ojc)
+	require.NoError(t, err)
+	require.NoError(t, fcs.InsertNode(ctx, stfcs, root))
+
+	tests := []struct {
+		name          string
+		blk           *ethpb.SignedBeaconBlock
+		s             state.BeaconState
+		time          uint64
+		wantErrString string
+	}{
+		{
+			name:          "parent block root does not have a state",
+			blk:           util.NewBeaconBlock(),
+			s:             st.Copy(),
+			wantErrString: "could not reconstruct parent state",
+		},
+		{
+			name: "block is from the future",
+			blk: func() *ethpb.SignedBeaconBlock {
+				b := util.NewBeaconBlock()
+				b.Block.ParentRoot = randomParentRoot2
+				b.Block.Slot = params.BeaconConfig().FarFutureSlot
+				return b
+			}(),
+			s:             st.Copy(),
+			wantErrString: "is in the far distant future",
+		},
+		{
+			name: "could not get finalized block",
+			blk: func() *ethpb.SignedBeaconBlock {
+				b := util.NewBeaconBlock()
+				b.Block.ParentRoot = randomParentRoot[:]
+				b.Block.Slot = 2
+				return b
+			}(),
+			s:             st.Copy(),
+			wantErrString: "not descendant of finalized checkpoint",
+		},
+		{
+			name: "same slot as finalized block",
+			blk: func() *ethpb.SignedBeaconBlock {
+				b := util.NewBeaconBlock()
+				b.Block.Slot = 0
+				b.Block.ParentRoot = randomParentRoot2
+				return b
+			}(),
+			s:             st.Copy(),
+			wantErrString: "block is equal or earlier than finalized block, slot 0 < slot 0",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			fRoot := bytesutil.ToBytes32(roots[0])
+			require.NoError(t, service.cfg.ForkChoiceStore.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: fRoot}))
+			root, err := tt.blk.Block.HashTreeRoot()
+			assert.NoError(t, err)
+			wsb, err := consensusblocks.NewSignedBeaconBlock(tt.blk)
+			require.NoError(t, err)
+			err = service.onBlock(ctx, wsb, root)
+			assert.ErrorContains(t, tt.wantErrString, err)
+		})
+	}
+}
+
 func TestStore_OnBlockBatch(t *testing.T) {
 	service, tr := minimalTestService(t)
 	ctx := tr.ctx
@@ -539,7 +636,7 @@ func TestHandleEpochBoundary_UpdateFirstSlot(t *testing.T) {
 	s, _ := util.DeterministicGenesisState(t, 1024)
 	service.head = &head{state: s}
 	require.NoError(t, s.SetSlot(2*params.BeaconConfig().SlotsPerEpoch))
-	require.NoError(t, service.handleEpochBoundary(ctx, s, []byte{}))
+	require.NoError(t, service.handleEpochBoundary(ctx, s))
 	require.Equal(t, 3*params.BeaconConfig().SlotsPerEpoch, service.nextEpochBoundarySlot)
 }

@@ -560,20 +657,7 @@ func TestOnBlock_CanFinalize_WithOnTick(t *testing.T) {
 		wsb, err := consensusblocks.NewSignedBeaconBlock(blk)
 		require.NoError(t, err)
 		require.NoError(t, fcs.NewSlot(ctx, i))
-		// Save current justified and finalized epochs for future use.
-		currStoreJustifiedEpoch := service.CurrentJustifiedCheckpt().Epoch
-		currStoreFinalizedEpoch := service.FinalizedCheckpt().Epoch
-
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, r, wsb, postState))
-		require.NoError(t, service.postBlockProcess(ctx, wsb, r, postState, true))
-		require.NoError(t, service.updateJustificationOnBlock(ctx, preState, postState, currStoreJustifiedEpoch))
-		_, err = service.updateFinalizationOnBlock(ctx, preState, postState, currStoreFinalizedEpoch)
-		require.NoError(t, err)
-
+		require.NoError(t, service.onBlock(ctx, wsb, r))
 		testState, err = service.cfg.StateGen.StateByRoot(ctx, r)
 		require.NoError(t, err)
 	}
@@ -608,20 +692,7 @@ func TestOnBlock_CanFinalize(t *testing.T) {
 		require.NoError(t, err)
 		wsb, err := consensusblocks.NewSignedBeaconBlock(blk)
 		require.NoError(t, err)
-		// Save current justified and finalized epochs for future use.
-		currStoreJustifiedEpoch := service.CurrentJustifiedCheckpt().Epoch
-		currStoreFinalizedEpoch := service.FinalizedCheckpt().Epoch
-
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, r, wsb, postState))
-		require.NoError(t, service.postBlockProcess(ctx, wsb, r, postState, true))
-		require.NoError(t, service.updateJustificationOnBlock(ctx, preState, postState, currStoreJustifiedEpoch))
-		_, err = service.updateFinalizationOnBlock(ctx, preState, postState, currStoreFinalizedEpoch)
-		require.NoError(t, err)
-
+		require.NoError(t, service.onBlock(ctx, wsb, r))
 		testState, err = service.cfg.StateGen.StateByRoot(ctx, r)
 		require.NoError(t, err)
 	}
@@ -643,7 +714,8 @@ func TestOnBlock_CanFinalize(t *testing.T) {

 func TestOnBlock_NilBlock(t *testing.T) {
 	service, tr := minimalTestService(t)
-	err := service.postBlockProcess(tr.ctx, nil, [32]byte{}, nil, true)
+
+	err := service.onBlock(tr.ctx, nil, [32]byte{})
 	require.Equal(t, true, IsInvalidBlock(err))
 }

@@ -657,11 +729,11 @@ func TestOnBlock_InvalidSignature(t *testing.T) {
 	blk, err := util.GenerateFullBlock(gs, keys, util.DefaultBlockGenConfig(), 1)
 	require.NoError(t, err)
 	blk.Signature = []byte{'a'} // Mutate the signature.
+	r, err := blk.Block.HashTreeRoot()
+	require.NoError(t, err)
 	wsb, err := consensusblocks.NewSignedBeaconBlock(blk)
 	require.NoError(t, err)
-	preState, err := service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	_, err = service.validateStateTransition(ctx, preState, wsb)
+	err = service.onBlock(ctx, wsb, r)
 	require.Equal(t, true, IsInvalidBlock(err))
 }

@@ -685,13 +757,7 @@ func TestOnBlock_CallNewPayloadAndForkchoiceUpdated(t *testing.T) {
 		require.NoError(t, err)
 		wsb, err := consensusblocks.NewSignedBeaconBlock(blk)
 		require.NoError(t, err)
-
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, r, wsb, postState))
-		require.NoError(t, service.postBlockProcess(ctx, wsb, r, postState, false))
+		require.NoError(t, service.onBlock(ctx, wsb, r))
 		testState, err = service.cfg.StateGen.StateByRoot(ctx, r)
 		require.NoError(t, err)
 	}
@@ -717,7 +783,7 @@ func TestInsertFinalizedDeposits(t *testing.T) {
 			Signature:             zeroSig[:],
 		}, Proof: [][]byte{root}}, 100+i, int64(i), bytesutil.ToBytes32(root)))
 	}
-	service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k'})
+	assert.NoError(t, service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k'}))
 	fDeposits := depositCache.FinalizedDeposits(ctx)
 	assert.Equal(t, 7, int(fDeposits.MerkleTrieIndex), "Finalized deposits not inserted correctly")
 	deps := depositCache.AllDeposits(ctx, big.NewInt(107))
@@ -726,45 +792,6 @@ func TestInsertFinalizedDeposits(t *testing.T) {
 	}
 }

-func TestInsertFinalizedDeposits_PrunePendingDeposits(t *testing.T) {
-	service, tr := minimalTestService(t)
-	ctx, depositCache := tr.ctx, tr.dc
-
-	gs, _ := util.DeterministicGenesisState(t, 32)
-	require.NoError(t, service.saveGenesisData(ctx, gs))
-	gs = gs.Copy()
-	assert.NoError(t, gs.SetEth1Data(&ethpb.Eth1Data{DepositCount: 10}))
-	assert.NoError(t, gs.SetEth1DepositIndex(8))
-	assert.NoError(t, service.cfg.StateGen.SaveState(ctx, [32]byte{'m', 'o', 'c', 'k'}, gs))
-	var zeroSig [96]byte
-	for i := uint64(0); i < uint64(4*params.BeaconConfig().SlotsPerEpoch); i++ {
-		root := []byte(strconv.Itoa(int(i)))
-		assert.NoError(t, depositCache.InsertDeposit(ctx, &ethpb.Deposit{Data: &ethpb.Deposit_Data{
-			PublicKey:             bytesutil.FromBytes48([fieldparams.BLSPubkeyLength]byte{}),
-			WithdrawalCredentials: params.BeaconConfig().ZeroHash[:],
-			Amount:                0,
-			Signature:             zeroSig[:],
-		}, Proof: [][]byte{root}}, 100+i, int64(i), bytesutil.ToBytes32(root)))
-		depositCache.InsertPendingDeposit(ctx, &ethpb.Deposit{Data: &ethpb.Deposit_Data{
-			PublicKey:             bytesutil.FromBytes48([fieldparams.BLSPubkeyLength]byte{}),
-			WithdrawalCredentials: params.BeaconConfig().ZeroHash[:],
-			Amount:                0,
-			Signature:             zeroSig[:],
-		}, Proof: [][]byte{root}}, 100+i, int64(i), bytesutil.ToBytes32(root))
-	}
-	service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k'})
-	fDeposits := depositCache.FinalizedDeposits(ctx)
-	assert.Equal(t, 7, int(fDeposits.MerkleTrieIndex), "Finalized deposits not inserted correctly")
-	deps := depositCache.AllDeposits(ctx, big.NewInt(107))
-	for _, d := range deps {
-		assert.DeepEqual(t, [][]byte(nil), d.Proof, "Proofs are not empty")
-	}
-	pendingDeps := depositCache.PendingContainers(ctx, nil)
-	for _, d := range pendingDeps {
-		assert.DeepEqual(t, true, d.Index >= 8, "Pending deposits were not pruned")
-	}
-}
-
 func TestInsertFinalizedDeposits_MultipleFinalizedRoutines(t *testing.T) {
 	service, tr := minimalTestService(t)
 	ctx, depositCache := tr.ctx, tr.dc
@@ -792,7 +819,7 @@ func TestInsertFinalizedDeposits_MultipleFinalizedRoutines(t *testing.T) {
 	// Insert 3 deposits before hand.
 	require.NoError(t, depositCache.InsertFinalizedDeposits(ctx, 2))

-	service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k'})
+	assert.NoError(t, service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k'}))
 	fDeposits := depositCache.FinalizedDeposits(ctx)
 	assert.Equal(t, 5, int(fDeposits.MerkleTrieIndex), "Finalized deposits not inserted correctly")

@@ -802,7 +829,7 @@ func TestInsertFinalizedDeposits_MultipleFinalizedRoutines(t *testing.T) {
 	}

 	// Insert New Finalized State with higher deposit count.
-	service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k', '2'})
+	assert.NoError(t, service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k', '2'}))
 	fDeposits = depositCache.FinalizedDeposits(ctx)
 	assert.Equal(t, 12, int(fDeposits.MerkleTrieIndex), "Finalized deposits not inserted correctly")
 	deps = depositCache.AllDeposits(ctx, big.NewInt(112))
@@ -1104,35 +1131,19 @@ func TestOnBlock_ProcessBlocksParallel(t *testing.T) {
 		var wg sync.WaitGroup
 		wg.Add(4)
 		go func() {
-			preState, err := service.getBlockPreState(ctx, wsb1.Block())
-			require.NoError(t, err)
-			postState, err := service.validateStateTransition(ctx, preState, wsb1)
-			require.NoError(t, err)
-			require.NoError(t, service.postBlockProcess(ctx, wsb1, r1, postState, true))
+			require.NoError(t, service.onBlock(ctx, wsb1, r1))
 			wg.Done()
 		}()
 		go func() {
-			preState, err := service.getBlockPreState(ctx, wsb2.Block())
-			require.NoError(t, err)
-			postState, err := service.validateStateTransition(ctx, preState, wsb2)
-			require.NoError(t, err)
-			require.NoError(t, service.postBlockProcess(ctx, wsb2, r2, postState, true))
+			require.NoError(t, service.onBlock(ctx, wsb2, r2))
 			wg.Done()
 		}()
 		go func() {
-			preState, err := service.getBlockPreState(ctx, wsb3.Block())
-			require.NoError(t, err)
-			postState, err := service.validateStateTransition(ctx, preState, wsb3)
-			require.NoError(t, err)
-			require.NoError(t, service.postBlockProcess(ctx, wsb3, r3, postState, true))
+			require.NoError(t, service.onBlock(ctx, wsb3, r3))
 			wg.Done()
 		}()
 		go func() {
-			preState, err := service.getBlockPreState(ctx, wsb4.Block())
-			require.NoError(t, err)
-			postState, err := service.validateStateTransition(ctx, preState, wsb4)
-			require.NoError(t, err)
-			require.NoError(t, service.postBlockProcess(ctx, wsb4, r4, postState, true))
+			require.NoError(t, service.onBlock(ctx, wsb4, r4))
 			wg.Done()
 		}()
 		wg.Wait()
@@ -1200,13 +1211,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		require.NoError(t, service.postBlockProcess(ctx, wsb, root, postState, false))
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}

 	for i := 6; i < 12; i++ {
@@ -1219,12 +1224,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		err = service.postBlockProcess(ctx, wsb, root, postState, false)
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}

@@ -1238,12 +1238,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		err = service.postBlockProcess(ctx, wsb, root, postState, false)
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}
 	// Check that we haven't justified the second epoch yet
@@ -1260,12 +1255,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 	require.NoError(t, err)
 	firstInvalidRoot, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err := service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err := service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, firstInvalidRoot, wsb, postState))
-	err = service.postBlockProcess(ctx, wsb, firstInvalidRoot, postState, false)
+	err = service.onBlock(ctx, wsb, firstInvalidRoot)
 	require.NoError(t, err)
 	jc = service.cfg.ForkChoiceStore.JustifiedCheckpoint()
 	require.Equal(t, primitives.Epoch(2), jc.Epoch)
@@ -1288,12 +1278,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 	require.NoError(t, err)
 	root, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err = service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err = service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	err = service.postBlockProcess(ctx, wsb, root, postState, false)
+	err = service.onBlock(ctx, wsb, root)
 	require.ErrorContains(t, "received an INVALID payload from execution engine", err)
 	// Check that forkchoice's head is the last invalid block imported. The
 	// store's headroot is the previous head (since the invalid block did
@@ -1316,13 +1301,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 	require.NoError(t, err)
 	root, err = b.Block.HashTreeRoot()
 	require.NoError(t, err)
-
-	preState, err = service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err = service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	err = service.postBlockProcess(ctx, wsb, root, postState, true)
+	err = service.onBlock(ctx, wsb, root)
 	require.NoError(t, err)
 	// Check the newly imported block is head, it justified the right
 	// checkpoint and the node is no longer optimistic
@@ -1379,12 +1358,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		require.NoError(t, service.postBlockProcess(ctx, wsb, root, postState, false))
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}

 	for i := 6; i < 12; i++ {
@@ -1397,12 +1371,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		err = service.postBlockProcess(ctx, wsb, root, postState, false)
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}

@@ -1416,13 +1385,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		err = service.postBlockProcess(ctx, wsb, root, postState, false)
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}
 	// Check that we haven't justified the second epoch yet
@@ -1439,12 +1402,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 	require.NoError(t, err)
 	firstInvalidRoot, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err := service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err := service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, firstInvalidRoot, wsb, postState))
-	err = service.postBlockProcess(ctx, wsb, firstInvalidRoot, postState, false)
+	err = service.onBlock(ctx, wsb, firstInvalidRoot)
 	require.NoError(t, err)
 	jc = service.cfg.ForkChoiceStore.JustifiedCheckpoint()
 	require.Equal(t, primitives.Epoch(2), jc.Epoch)
@@ -1467,12 +1425,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 	require.NoError(t, err)
 	root, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-
-	preState, err = service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
-	require.NoError(t, err)
-	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, wsb, root)
+	err = service.onBlock(ctx, wsb, root)
 	require.ErrorContains(t, "received an INVALID payload from execution engine", err)
 	// Check that forkchoice's head and store's headroot are the previous head (since the invalid block did
 	// not finish importing and it was never imported to forkchoice). Check
@@ -1495,12 +1448,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 	require.NoError(t, err)
 	root, err = b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err = service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err = service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	err = service.postBlockProcess(ctx, wsb, root, postState, true)
+	err = service.onBlock(ctx, wsb, root)
 	require.NoError(t, err)
 	// Check the newly imported block is head, it justified the right
 	// checkpoint and the node is no longer optimistic
@@ -1558,13 +1506,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		require.NoError(t, service.postBlockProcess(ctx, wsb, root, postState, false))
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}

 	for i := 6; i < 12; i++ {
@@ -1577,13 +1519,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		err = service.postBlockProcess(ctx, wsb, root, postState, false)
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}

@@ -1597,12 +1533,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	require.NoError(t, err)
 	lastValidRoot, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err := service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err := service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, lastValidRoot, wsb, postState))
-	err = service.postBlockProcess(ctx, wsb, lastValidRoot, postState, false)
+	err = service.onBlock(ctx, wsb, lastValidRoot)
 	require.NoError(t, err)
 	// save the post state and the payload Hash of this block since it will
 	// be the LVH
@@ -1624,12 +1555,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 		require.NoError(t, err)
 		invalidRoots[i-13], err = b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, invalidRoots[i-13], wsb, postState))
-		err = service.postBlockProcess(ctx, wsb, invalidRoots[i-13], postState, false)
+		err = service.onBlock(ctx, wsb, invalidRoots[i-13])
 		require.NoError(t, err)
 	}
 	// Check that we have justified the second epoch
@@ -1650,12 +1576,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	require.NoError(t, err)
 	root, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-
-	preState, err = service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
-	require.NoError(t, err)
-	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, wsb, root)
+	err = service.onBlock(ctx, wsb, root)
 	require.ErrorContains(t, "received an INVALID payload from execution engine", err)

 	// Check that forkchoice's head and store's headroot are the previous head (since the invalid block did
@@ -1689,12 +1610,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	require.NoError(t, err)
 	root, err = b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err = service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err = service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	require.NoError(t, service.postBlockProcess(ctx, wsb, root, postState, true))
+	require.NoError(t, service.onBlock(ctx, wsb, root))
 	// Check that the head is still INVALID and the node is still optimistic
 	require.Equal(t, invalidHeadRoot, service.cfg.ForkChoiceStore.CachedHeadRoot())
 	optimistic, err = service.IsOptimistic(ctx)
@@ -1712,12 +1628,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		err = service.postBlockProcess(ctx, wsb, root, postState, true)
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 		st, err = service.cfg.StateGen.StateByRoot(ctx, root)
 		require.NoError(t, err)
@@ -1737,13 +1648,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	require.NoError(t, err)
 	root, err = b.Block.HashTreeRoot()
 	require.NoError(t, err)
-
-	preState, err = service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err = service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	err = service.postBlockProcess(ctx, wsb, root, postState, true)
+	err = service.onBlock(ctx, wsb, root)
 	require.NoError(t, err)
 	require.Equal(t, root, service.cfg.ForkChoiceStore.CachedHeadRoot())
 	sjc = service.CurrentJustifiedCheckpt()
@@ -1794,12 +1699,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		require.NoError(t, service.postBlockProcess(ctx, wsb, root, postState, false))
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}

 	for i := 6; i < 12; i++ {
@@ -1812,12 +1712,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		err = service.postBlockProcess(ctx, wsb, root, postState, false)
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}

@@ -1831,12 +1726,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 	require.NoError(t, err)
 	lastValidRoot, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err := service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err := service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, lastValidRoot, wsb, postState))
-	err = service.postBlockProcess(ctx, wsb, lastValidRoot, postState, false)
+	err = service.onBlock(ctx, wsb, lastValidRoot)
 	require.NoError(t, err)
 	// save the post state and the payload Hash of this block since it will
 	// be the LVH
@@ -1857,18 +1747,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 		require.NoError(t, err)
 		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		// Save current justified and finalized epochs for future use.
-		currStoreJustifiedEpoch := service.CurrentJustifiedCheckpt().Epoch
-		currStoreFinalizedEpoch := service.FinalizedCheckpt().Epoch
-		preState, err := service.getBlockPreState(ctx, wsb.Block())
-		require.NoError(t, err)
-		postState, err := service.validateStateTransition(ctx, preState, wsb)
-		require.NoError(t, err)
-		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		require.NoError(t, service.postBlockProcess(ctx, wsb, root, postState, false))
-		require.NoError(t, service.updateJustificationOnBlock(ctx, preState, postState, currStoreJustifiedEpoch))
-		_, err = service.updateFinalizationOnBlock(ctx, preState, postState, currStoreFinalizedEpoch)
-		require.NoError(t, err)
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}
 	// Check that we have justified the second epoch
 	jc := service.cfg.ForkChoiceStore.JustifiedCheckpoint()
@@ -1887,11 +1766,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 	require.NoError(t, err)
 	root, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err = service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
-	require.NoError(t, err)
-	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, wsb, root)
+	err = service.onBlock(ctx, wsb, root)
 	require.ErrorContains(t, "received an INVALID payload from execution engine", err)

 	// Check that the headroot/state are not in DB and restart the node
@@ -1973,12 +1848,7 @@ func TestOnBlock_HandleBlockAttestations(t *testing.T) {
 	require.NoError(t, err)
 	root, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	preState, err := service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err := service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	require.NoError(t, service.postBlockProcess(ctx, wsb, root, postState, false))
+	require.NoError(t, service.onBlock(ctx, wsb, root))

 	st, err = service.HeadState(ctx)
 	require.NoError(t, err)
@@ -2005,9 +1875,9 @@ func TestOnBlock_HandleBlockAttestations(t *testing.T) {
 	r3 := bytesutil.ToBytes32(a3.Data.BeaconBlockRoot)
 	require.Equal(t, false, service.cfg.ForkChoiceStore.HasNode(r3))

-	require.NoError(t, service.handleBlockAttestations(ctx, wsb.Block(), st)) // fine to use the same committee as st
+	require.NoError(t, service.handleBlockAttestations(ctx, wsb.Block(), st)) // fine to use the same committe as st
 	require.Equal(t, 0, service.cfg.AttPool.ForkchoiceAttestationCount())
-	require.NoError(t, service.handleBlockAttestations(ctx, wsb3.Block(), st3)) // fine to use the same committee as st
+	require.NoError(t, service.handleBlockAttestations(ctx, wsb3.Block(), st3)) // fine to use the same committe as st
 	require.Equal(t, 1, len(service.cfg.AttPool.BlockAttestations()))
 }

--- a/beacon-chain/blockchain/receive_attestation.go
+++ b/beacon-chain/blockchain/receive_attestation.go
@@ -26,7 +26,7 @@ const reorgLateBlockCountAttestations = 2 * time.Second
 // AttestationStateFetcher allows for retrieving a beacon state corresponding to the block
 // root of an attestation's target checkpoint.
 type AttestationStateFetcher interface {
-	AttestationTargetState(ctx context.Context, target *ethpb.Checkpoint) (state.ReadOnlyBeaconState, error)
+	AttestationTargetState(ctx context.Context, target *ethpb.Checkpoint) (state.BeaconState, error)
 }

 // AttestationReceiver interface defines the methods of chain service receive and processing new attestations.
@@ -37,7 +37,7 @@ type AttestationReceiver interface {
 }

 // AttestationTargetState returns the pre state of attestation.
-func (s *Service) AttestationTargetState(ctx context.Context, target *ethpb.Checkpoint) (state.ReadOnlyBeaconState, error) {
+func (s *Service) AttestationTargetState(ctx context.Context, target *ethpb.Checkpoint) (state.BeaconState, error) {
 	ss, err := slots.EpochStart(target.Epoch)
 	if err != nil {
 		return nil, err
@@ -45,9 +45,6 @@ func (s *Service) AttestationTargetState(ctx context.Context, target *ethpb.Chec
 	if err := slots.ValidateClock(ss, uint64(s.genesisTime.Unix())); err != nil {
 		return nil, err
 	}
-	// We acquire the lock here instead than on gettAttPreState because that function gets called from UpdateHead that holds a write lock
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
 	return s.getAttPreState(ctx, target)
 }

--- a/beacon-chain/blockchain/receive_attestation_test.go
+++ b/beacon-chain/blockchain/receive_attestation_test.go
@@ -128,13 +128,7 @@ func TestService_ProcessAttestationsAndUpdateHead(t *testing.T) {
 	require.NoError(t, err)
 	wsb, err := blocks.NewSignedBeaconBlock(blk)
 	require.NoError(t, err)
-
-	preState, err := service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err := service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, tRoot, wsb, postState))
-	require.NoError(t, service.postBlockProcess(ctx, wsb, tRoot, postState, false))
+	require.NoError(t, service.onBlock(ctx, wsb, tRoot))
 	copied, err = service.cfg.StateGen.StateByRoot(ctx, tRoot)
 	require.NoError(t, err)
 	require.Equal(t, 2, fcs.NodeCount())
@@ -184,13 +178,7 @@ func TestService_UpdateHead_NoAtts(t *testing.T) {
 	require.NoError(t, err)
 	wsb, err := blocks.NewSignedBeaconBlock(blk)
 	require.NoError(t, err)
-
-	preState, err := service.getBlockPreState(ctx, wsb.Block())
-	require.NoError(t, err)
-	postState, err := service.validateStateTransition(ctx, preState, wsb)
-	require.NoError(t, err)
-	require.NoError(t, service.savePostStateInfo(ctx, tRoot, wsb, postState))
-	require.NoError(t, service.postBlockProcess(ctx, wsb, tRoot, postState, false))
+	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)
--- a/beacon-chain/blockchain/receive_block.go
+++ b/beacon-chain/blockchain/receive_block.go
@@ -7,18 +7,11 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed"
 	statefeed "github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed/state"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition"
-	forkchoicetypes "github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice/types"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/v4/config/features"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v4/monitoring/tracing"
-	ethpbv1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1/attestation"
 	"github.com/prysmaticlabs/prysm/v4/runtime/version"
 	"github.com/prysmaticlabs/prysm/v4/time"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
@@ -54,64 +47,15 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySig
 		return err
 	}

-	preState, err := s.getBlockPreState(ctx, blockCopy.Block())
-	if err != nil {
-		return errors.Wrap(err, "could not get block's prestate")
-	}
-	// Save current justified and finalized epochs for future use.
-	currStoreJustifiedEpoch := s.CurrentJustifiedCheckpt().Epoch
-	currStoreFinalizedEpoch := s.FinalizedCheckpt().Epoch
-
-	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
-	if err != nil {
-		return err
-	}
-
-	postState, err := s.validateStateTransition(ctx, preState, blockCopy)
-	if err != nil {
-		return errors.Wrap(err, "failed to validate consensus state transition function")
-	}
-	isValidPayload, err := s.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, blockCopy, blockRoot)
-	if err != nil {
-		return errors.Wrap(err, "could not notify the engine of the new payload")
-	}
-	// The rest of block processing takes a lock on forkchoice.
 	s.cfg.ForkChoiceStore.Lock()
 	defer s.cfg.ForkChoiceStore.Unlock()
-	if err := s.savePostStateInfo(ctx, blockRoot, blockCopy, postState); err != nil {
-		return errors.Wrap(err, "could not save post state info")
-	}
-
-	if err := s.postBlockProcess(ctx, blockCopy, blockRoot, postState, isValidPayload); err != nil {
+	// Apply state transition on the new block.
+	if err := s.onBlock(ctx, blockCopy, blockRoot); err != nil {
 		err := errors.Wrap(err, "could not process block")
 		tracing.AnnotateError(span, err)
 		return err
 	}

-	if err := s.updateJustificationOnBlock(ctx, preState, postState, currStoreJustifiedEpoch); err != nil {
-		return errors.Wrap(err, "could not update justified checkpoint")
-	}
-
-	newFinalized, err := s.updateFinalizationOnBlock(ctx, preState, postState, currStoreFinalizedEpoch)
-	if err != nil {
-		return errors.Wrap(err, "could not update finalized checkpoint")
-	}
-	// Send finalized events and finalized deposits in the background
-	if newFinalized {
-		finalized := s.cfg.ForkChoiceStore.FinalizedCheckpoint()
-		go s.sendNewFinalizedEvent(ctx, blockCopy, postState, finalized)
-		depCtx, cancel := context.WithTimeout(context.Background(), depositDeadline)
-		go func() {
-			s.insertFinalizedDeposits(depCtx, finalized.Root)
-			cancel()
-		}()
-	}
-
-	// If slasher is configured, forward the attestations in the block via an event feed for processing.
-	if features.Get().EnableSlasher {
-		go s.sendBlockAttestationsToSlasher(blockCopy, preState)
-	}
-
 	// Handle post block operations such as pruning exits and bls messages if incoming block is the head
 	if err := s.prunePostBlockOperationPools(ctx, blockCopy, blockRoot); err != nil {
 		log.WithError(err).Error("Could not prune canonical objects from pool ")
@@ -142,8 +86,6 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySig
 		log.WithError(err).Error("Unable to log state transition data")
 	}

-	chainServiceProcessingTime.Observe(float64(time.Since(receivedTime).Milliseconds()))
-
 	return nil
 }

@@ -284,109 +226,3 @@ func (s *Service) checkSaveHotStateDB(ctx context.Context) error {

 	return s.cfg.StateGen.DisableSaveHotStateToDB(ctx)
 }
-
-// This performs the state transition function and returns the poststate or an
-// error if the block fails to verify the consensus rules
-func (s *Service) validateStateTransition(ctx context.Context, preState state.BeaconState, signed interfaces.ReadOnlySignedBeaconBlock) (state.BeaconState, error) {
-	b := signed.Block()
-	// Verify that the parent block is in forkchoice
-	parentRoot := b.ParentRoot()
-	if !s.InForkchoice(parentRoot) {
-		return nil, ErrNotDescendantOfFinalized
-	}
-	stateTransitionStartTime := time.Now()
-	postState, err := transition.ExecuteStateTransition(ctx, preState, signed)
-	if err != nil {
-		return nil, invalidBlock{error: err}
-	}
-	stateTransitionProcessingTime.Observe(float64(time.Since(stateTransitionStartTime).Milliseconds()))
-	return postState, nil
-}
-
-// updateJustificationOnBlock updates the justified checkpoint on DB if the
-// incoming block has updated it on forkchoice.
-func (s *Service) updateJustificationOnBlock(ctx context.Context, preState, postState state.BeaconState, preJustifiedEpoch primitives.Epoch) error {
-	justified := s.cfg.ForkChoiceStore.JustifiedCheckpoint()
-	preStateJustifiedEpoch := preState.CurrentJustifiedCheckpoint().Epoch
-	postStateJustifiedEpoch := postState.CurrentJustifiedCheckpoint().Epoch
-	if justified.Epoch > preJustifiedEpoch || (justified.Epoch == postStateJustifiedEpoch && justified.Epoch > preStateJustifiedEpoch) {
-		if err := s.cfg.BeaconDB.SaveJustifiedCheckpoint(ctx, &ethpb.Checkpoint{
-			Epoch: justified.Epoch, Root: justified.Root[:],
-		}); err != nil {
-			return err
-		}
-	}
-	return nil
-}
-
-// updateFinalizationOnBlock performs some duties when the incoming block
-// changes the finalized checkpoint. It returns true when this has happened.
-func (s *Service) updateFinalizationOnBlock(ctx context.Context, preState, postState state.BeaconState, preFinalizedEpoch primitives.Epoch) (bool, error) {
-	preStateFinalizedEpoch := preState.FinalizedCheckpoint().Epoch
-	postStateFinalizedEpoch := postState.FinalizedCheckpoint().Epoch
-	finalized := s.cfg.ForkChoiceStore.FinalizedCheckpoint()
-	if finalized.Epoch > preFinalizedEpoch || (finalized.Epoch == postStateFinalizedEpoch && finalized.Epoch > preStateFinalizedEpoch) {
-		if err := s.updateFinalized(ctx, &ethpb.Checkpoint{Epoch: finalized.Epoch, Root: finalized.Root[:]}); err != nil {
-			return true, err
-		}
-		return true, nil
-	}
-	return false, nil
-}
-
-// sendNewFinalizedEvent sends a new finalization checkpoint event over the
-// event feed. It needs to be called on the background
-func (s *Service) sendNewFinalizedEvent(ctx context.Context, signed interfaces.ReadOnlySignedBeaconBlock, postState state.BeaconState, finalized *forkchoicetypes.Checkpoint) {
-	isValidPayload := false
-	s.headLock.RLock()
-	if s.head != nil {
-		isValidPayload = s.head.optimistic
-	}
-	s.headLock.RUnlock()
-
-	// 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[:],
-			ExecutionOptimistic: isValidPayload,
-		},
-	})
-}
-
-// sendBlockAttestationsToSlasher sends the incoming block's attestation to the slasher
-func (s *Service) sendBlockAttestationsToSlasher(signed interfaces.ReadOnlySignedBeaconBlock, preState state.BeaconState) {
-	// Feed the indexed attestation to slasher if enabled. This action
-	// is done in the background to avoid adding more load to this critical code path.
-	ctx := context.TODO()
-	for _, att := range signed.Block().Body().Attestations() {
-		committee, err := helpers.BeaconCommitteeFromState(ctx, preState, att.Data.Slot, att.Data.CommitteeIndex)
-		if err != nil {
-			log.WithError(err).Error("Could not get attestation committee")
-			return
-		}
-		indexedAtt, err := attestation.ConvertToIndexed(ctx, att, committee)
-		if err != nil {
-			log.WithError(err).Error("Could not convert to indexed attestation")
-			return
-		}
-		s.cfg.SlasherAttestationsFeed.Send(indexedAtt)
-	}
-}
-
-// validateExecutionOnBlock notifies the engine of the incoming block execution payload and returns true if the payload is valid
-func (s *Service) validateExecutionOnBlock(ctx context.Context, ver int, header interfaces.ExecutionData, signed interfaces.ReadOnlySignedBeaconBlock, blockRoot [32]byte) (bool, error) {
-	isValidPayload, err := s.notifyNewPayload(ctx, ver, header, signed)
-	if err != nil {
-		return false, s.handleInvalidExecutionError(ctx, err, blockRoot, signed.Block().ParentRoot())
-	}
-	if signed.Version() < version.Capella && isValidPayload {
-		if err := s.validateMergeTransitionBlock(ctx, ver, header, signed); err != nil {
-			return isValidPayload, err
-		}
-	}
-	return isValidPayload, nil
-}
--- a/beacon-chain/blockchain/service.go
+++ b/beacon-chain/blockchain/service.go
@@ -17,7 +17,6 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed"
 	statefeed "github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed/state"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
-	coreTime "github.com/prysmaticlabs/prysm/v4/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/execution"
@@ -61,7 +60,6 @@ type Service struct {
 	wsVerifier            *WeakSubjectivityVerifier
 	clockSetter           startup.ClockSetter
 	clockWaiter           startup.ClockWaiter
-	syncComplete          chan struct{}
 }

 // config options for the service.
@@ -132,7 +130,7 @@ func (s *Service) Start() {
 		}
 	}
 	s.spawnProcessAttestationsRoutine()
-	go s.runLateBlockTasks()
+	s.spawnLateBlockTasksLoop()
 }

 // Stop the blockchain service's main event loop and associated goroutines.
@@ -309,13 +307,7 @@ func (s *Service) initializeHeadFromDB(ctx context.Context) error {
 	if err != nil {
 		return errors.Wrap(err, "could not get finalized block")
 	}
-	if err := s.setHead(&head{
-		finalizedRoot,
-		finalizedBlock,
-		finalizedState,
-		finalizedBlock.Block().Slot(),
-		false,
-	}); err != nil {
+	if err := s.setHead(finalizedRoot, finalizedBlock, finalizedState); err != nil {
 		return errors.Wrap(err, "could not set head")
 	}

@@ -409,7 +401,7 @@ func (s *Service) initializeBeaconChain(
 	if err := helpers.UpdateCommitteeCache(ctx, genesisState, 0); err != nil {
 		return nil, err
 	}
-	if err := helpers.UpdateProposerIndicesInCache(ctx, genesisState, coreTime.CurrentEpoch(genesisState)); err != nil {
+	if err := helpers.UpdateProposerIndicesInCache(ctx, genesisState); err != nil {
 		return nil, err
 	}

@@ -447,13 +439,7 @@ func (s *Service) saveGenesisData(ctx context.Context, genesisState state.Beacon
 	}
 	s.cfg.ForkChoiceStore.SetGenesisTime(uint64(s.genesisTime.Unix()))

-	if err := s.setHead(&head{
-		genesisBlkRoot,
-		genesisBlk,
-		genesisState,
-		genesisBlk.Block().Slot(),
-		false,
-	}); err != nil {
+	if err := s.setHead(genesisBlkRoot, genesisBlk, genesisState); err != nil {
 		log.WithError(err).Fatal("Could not set head")
 	}
 	return nil
--- a/beacon-chain/blockchain/service_test.go
+++ b/beacon-chain/blockchain/service_test.go
@@ -377,7 +377,9 @@ func TestHasBlock_ForkChoiceAndDB_DoublyLinkedTree(t *testing.T) {
 	require.NoError(t, err)
 	beaconState, err := util.NewBeaconState()
 	require.NoError(t, err)
-	require.NoError(t, s.cfg.ForkChoiceStore.InsertNode(ctx, beaconState, r))
+	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")
@@ -451,7 +453,9 @@ func BenchmarkHasBlockForkChoiceStore_DoublyLinkedTree(b *testing.B) {
 	bs := &ethpb.BeaconState{FinalizedCheckpoint: &ethpb.Checkpoint{Root: make([]byte, 32)}, CurrentJustifiedCheckpoint: &ethpb.Checkpoint{Root: make([]byte, 32)}}
 	beaconState, err := state_native.InitializeFromProtoPhase0(bs)
 	require.NoError(b, err)
-	require.NoError(b, s.cfg.ForkChoiceStore.InsertNode(ctx, beaconState, r))
+	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++ {
--- a/beacon-chain/blockchain/testing/mock.go
+++ b/beacon-chain/blockchain/testing/mock.go
@@ -320,7 +320,7 @@ func (_ *ChainService) ReceiveAttestation(_ context.Context, _ *ethpb.Attestatio
 }

 // AttestationTargetState mocks AttestationTargetState method in chain service.
-func (s *ChainService) AttestationTargetState(_ context.Context, _ *ethpb.Checkpoint) (state.ReadOnlyBeaconState, error) {
+func (s *ChainService) AttestationTargetState(_ context.Context, _ *ethpb.Checkpoint) (state.BeaconState, error) {
 	return s.State, nil
 }

--- a/beacon-chain/builder/service_test.go
+++ b/beacon-chain/builder/service_test.go
@@ -3,7 +3,6 @@ package builder
 import (
 	"context"
 	"testing"
-	"time"

 	buildertesting "github.com/prysmaticlabs/prysm/v4/api/client/builder/testing"
 	blockchainTesting "github.com/prysmaticlabs/prysm/v4/beacon-chain/blockchain/testing"
@@ -39,21 +38,6 @@ func Test_RegisterValidator(t *testing.T) {
 	assert.Equal(t, true, builder.RegisteredVals[pubkey])
 }

-func Test_RegisterValidator_WithCache(t *testing.T) {
-	ctx := context.Background()
-	headFetcher := &blockchainTesting.ChainService{}
-	builder := buildertesting.NewClient()
-	s, err := NewService(ctx, WithRegistrationCache(), WithHeadFetcher(headFetcher), WithBuilderClient(&builder))
-	require.NoError(t, err)
-	pubkey := bytesutil.ToBytes48([]byte("pubkey"))
-	var feeRecipient [20]byte
-	reg := &eth.ValidatorRegistrationV1{Pubkey: pubkey[:], Timestamp: uint64(time.Now().UTC().Unix()), FeeRecipient: feeRecipient[:]}
-	require.NoError(t, s.RegisterValidator(ctx, []*eth.SignedValidatorRegistrationV1{{Message: reg}}))
-	registration, err := s.registrationCache.RegistrationByIndex(0)
-	require.NoError(t, err)
-	require.DeepEqual(t, reg, registration)
-}
-
 func Test_BuilderMethodsWithouClient(t *testing.T) {
 	s, err := NewService(context.Background())
 	require.NoError(t, err)
--- a/beacon-chain/builder/testing/mock.go
+++ b/beacon-chain/builder/testing/mock.go
@@ -58,7 +58,7 @@ func (s *MockBuilderService) SubmitBlindedBlock(_ context.Context, _ interfaces.

 // GetHeader for mocking.
 func (s *MockBuilderService) GetHeader(_ context.Context, slot primitives.Slot, _ [32]byte, _ [48]byte) (builder.SignedBid, error) {
-	if slots.ToEpoch(slot) >= params.BeaconConfig().CapellaForkEpoch || s.BidCapella != nil {
+	if slots.ToEpoch(slot) >= params.BeaconConfig().CapellaForkEpoch {
 		return builder.WrappedSignedBuilderBidCapella(s.BidCapella)
 	}
 	w, err := builder.WrappedSignedBuilderBid(s.Bid)
--- a/beacon-chain/cache/BUILD.bazel
+++ b/beacon-chain/cache/BUILD.bazel
@@ -34,7 +34,6 @@ go_library(
    deps = [
        "//beacon-chain/state:go_default_library",
        "//cache/lru:go_default_library",
-        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//container/slice:go_default_library",
@@ -88,6 +87,7 @@ go_test(
        "//testing/util:go_default_library",
        "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
        "@com_github_google_gofuzz//:go_default_library",
+        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
        "@org_golang_google_protobuf//proto:go_default_library",
    ],
 )
--- a/beacon-chain/cache/depositcache/deposits_cache_test.go
+++ b/beacon-chain/cache/depositcache/deposits_cache_test.go
@@ -804,7 +804,7 @@ func TestFinalizedDeposits_ReturnsTrieCorrectly(t *testing.T) {
 	require.NoError(t, dc.InsertFinalizedDeposits(context.Background(), 3))
 	require.NoError(t, dc.InsertFinalizedDeposits(context.Background(), 4))

-	// Mimic finalized deposit trie fetch.
+	// Mimick finalized deposit trie fetch.
 	fd := dc.FinalizedDeposits(context.Background())
 	deps := dc.NonFinalizedDeposits(context.Background(), fd.MerkleTrieIndex, big.NewInt(14))
 	insertIndex := fd.MerkleTrieIndex + 1
--- a/beacon-chain/cache/payload_id.go
+++ b/beacon-chain/cache/payload_id.go
@@ -4,41 +4,35 @@ import (
 	"bytes"
 	"sync"

-	fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 )

-const keyLength = 40
 const vIdLength = 8
 const pIdLength = 8
 const vpIdsLength = vIdLength + pIdLength

 // ProposerPayloadIDsCache is a cache of proposer payload IDs.
-// The key is the concatenation of the slot and the block root.
-// The value is the concatenation of the proposer and payload IDs, 8 bytes each.
+// The key is the slot. The value is the concatenation of the proposer and payload IDs. 8 bytes each.
 type ProposerPayloadIDsCache struct {
-	slotToProposerAndPayloadIDs map[[keyLength]byte][vpIdsLength]byte
+	slotToProposerAndPayloadIDs map[[40]byte][vpIdsLength]byte
 	sync.RWMutex
 }

 // NewProposerPayloadIDsCache creates a new proposer payload IDs cache.
 func NewProposerPayloadIDsCache() *ProposerPayloadIDsCache {
 	return &ProposerPayloadIDsCache{
-		slotToProposerAndPayloadIDs: make(map[[keyLength]byte][vpIdsLength]byte),
+		slotToProposerAndPayloadIDs: make(map[[40]byte][vpIdsLength]byte),
 	}
 }

-// GetProposerPayloadIDs returns the proposer and payload IDs for the given slot and head root to build the block.
-func (f *ProposerPayloadIDsCache) GetProposerPayloadIDs(
-	slot primitives.Slot,
-	r [fieldparams.RootLength]byte,
-) (primitives.ValidatorIndex, [pIdLength]byte, bool) {
+// 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) {
 	f.RLock()
 	defer f.RUnlock()
 	ids, ok := f.slotToProposerAndPayloadIDs[idKey(slot, r)]
 	if !ok {
-		return 0, [pIdLength]byte{}, false
+		return 0, [8]byte{}, false
 	}
 	vId := ids[:vIdLength]

@@ -49,13 +43,8 @@ func (f *ProposerPayloadIDsCache) GetProposerPayloadIDs(
 	return primitives.ValidatorIndex(bytesutil.BytesToUint64BigEndian(vId)), pId, true
 }

-// SetProposerAndPayloadIDs sets the proposer and payload IDs for the given slot and head root to build block.
-func (f *ProposerPayloadIDsCache) SetProposerAndPayloadIDs(
-	slot primitives.Slot,
-	vId primitives.ValidatorIndex,
-	pId [pIdLength]byte,
-	r [fieldparams.RootLength]byte,
-) {
+// 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) {
 	f.Lock()
 	defer f.Unlock()
 	var vIdBytes [vIdLength]byte
@@ -74,7 +63,7 @@ func (f *ProposerPayloadIDsCache) SetProposerAndPayloadIDs(
 	}
 }

-// PrunePayloadIDs removes the payload ID entries older than input slot.
+// PrunePayloadIDs removes the payload id entries that's current than input slot.
 func (f *ProposerPayloadIDsCache) PrunePayloadIDs(slot primitives.Slot) {
 	f.Lock()
 	defer f.Unlock()
@@ -87,8 +76,8 @@ func (f *ProposerPayloadIDsCache) PrunePayloadIDs(slot primitives.Slot) {
 	}
 }

-func idKey(slot primitives.Slot, r [fieldparams.RootLength]byte) [keyLength]byte {
-	var k [keyLength]byte
+func idKey(slot primitives.Slot, r [32]byte) [40]byte {
+	var k [40]byte
 	copy(k[:], append(bytesutil.Uint64ToBytesBigEndian(uint64(slot)), r[:]...))
 	return k
 }
--- a/beacon-chain/cache/registration.go
+++ b/beacon-chain/cache/registration.go
@@ -3,11 +3,15 @@ package cache
 import (
 	"context"
 	"sync"
+	"time"

 	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v4/math"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
+	log "github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
 )

@@ -34,10 +38,33 @@ func (regCache *RegistrationCache) RegistrationByIndex(id primitives.ValidatorIn
 		regCache.lock.RUnlock()
 		return nil, errors.Wrapf(ErrNotFoundRegistration, "validator id %d", id)
 	}
+	isExpired, err := RegistrationTimeStampExpired(v.Timestamp)
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to check registration expiration")
+	}
+	if isExpired {
+		regCache.lock.RUnlock()
+		regCache.lock.Lock()
+		defer regCache.lock.Unlock()
+		delete(regCache.indexToRegistration, id)
+		log.Warnf("registration for validator index %d expired at unix time %d", id, v.Timestamp)
+		return nil, errors.Wrapf(ErrNotFoundRegistration, "validator id %d", id)
+	}
 	regCache.lock.RUnlock()
 	return v, nil
 }

+func RegistrationTimeStampExpired(ts uint64) (bool, error) {
+	// safely convert unint64 to int64
+	i, err := math.Int(ts)
+	if err != nil {
+		return false, err
+	}
+	expiryDuration := params.BeaconConfig().RegistrationDuration
+	// registered time + expiration duration < current time = expired
+	return time.Unix(int64(i), 0).Add(expiryDuration).Before(time.Now()), nil
+}
+
 // UpdateIndexToRegisteredMap adds or updates values in the cache based on the argument.
 func (regCache *RegistrationCache) UpdateIndexToRegisteredMap(ctx context.Context, m map[primitives.ValidatorIndex]*ethpb.ValidatorRegistrationV1) {
 	_, span := trace.StartSpan(ctx, "RegistrationCache.UpdateIndexToRegisteredMap")
--- a/beacon-chain/cache/registration_test.go
+++ b/beacon-chain/cache/registration_test.go
@@ -6,12 +6,15 @@ import (
 	"time"

 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/testing/require"
+	logTest "github.com/sirupsen/logrus/hooks/test"
 )

 func TestRegistrationCache(t *testing.T) {
+	hook := logTest.NewGlobal()
 	pubkey, err := hexutil.Decode("0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a")
 	require.NoError(t, err)
 	validatorIndex := primitives.ValidatorIndex(1)
@@ -28,14 +31,29 @@ func TestRegistrationCache(t *testing.T) {
 	reg, err := cache.RegistrationByIndex(validatorIndex)
 	require.NoError(t, err)
 	require.Equal(t, string(reg.Pubkey), string(pubkey))
-	t.Run("successfully updates", func(t *testing.T) {
-		pubkey, err := hexutil.Decode("0x88247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a")
-		require.NoError(t, err)
+	t.Run("Registration expired", func(t *testing.T) {
 		validatorIndex2 := primitives.ValidatorIndex(2)
+		overExpirationPadTime := time.Second * time.Duration(params.BeaconConfig().SecondsPerSlot*uint64(params.BeaconConfig().SlotsPerEpoch)*4) // 4 epochs
 		m[validatorIndex2] = &ethpb.ValidatorRegistrationV1{
 			FeeRecipient: []byte{},
 			GasLimit:     100,
-			Timestamp:    uint64(time.Now().Unix()),
+			Timestamp:    uint64(time.Now().Add(-1 * overExpirationPadTime).Unix()),
+			Pubkey:       pubkey,
+		}
+		cache.UpdateIndexToRegisteredMap(context.Background(), m)
+		_, err := cache.RegistrationByIndex(validatorIndex2)
+		require.ErrorContains(t, "no validator registered", err)
+		require.LogsContain(t, hook, "expired")
+	})
+	t.Run("Registration close to expiration still passes", func(t *testing.T) {
+		pubkey, err := hexutil.Decode("0x88247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a")
+		require.NoError(t, err)
+		validatorIndex2 := primitives.ValidatorIndex(2)
+		overExpirationPadTime := time.Second * time.Duration((params.BeaconConfig().SecondsPerSlot*uint64(params.BeaconConfig().SlotsPerEpoch)*3)-5) // 3 epochs - 5 seconds
+		m[validatorIndex2] = &ethpb.ValidatorRegistrationV1{
+			FeeRecipient: []byte{},
+			GasLimit:     100,
+			Timestamp:    uint64(time.Now().Add(-1 * overExpirationPadTime).Unix()),
 			Pubkey:       pubkey,
 		}
 		cache.UpdateIndexToRegisteredMap(context.Background(), m)
@@ -44,3 +62,21 @@ func TestRegistrationCache(t *testing.T) {
 		require.Equal(t, string(reg.Pubkey), string(pubkey))
 	})
 }
+
+func Test_RegistrationTimeStampExpired(t *testing.T) {
+	// expiration set at 3 epochs
+	t.Run("expired registration", func(t *testing.T) {
+		overExpirationPadTime := time.Second * time.Duration(params.BeaconConfig().SecondsPerSlot*uint64(params.BeaconConfig().SlotsPerEpoch)*4) // 4 epochs
+		ts := uint64(time.Now().Add(-1 * overExpirationPadTime).Unix())
+		isExpired, err := RegistrationTimeStampExpired(ts)
+		require.NoError(t, err)
+		require.Equal(t, true, isExpired)
+	})
+	t.Run("is not expired registration", func(t *testing.T) {
+		overExpirationPadTime := time.Second * time.Duration((params.BeaconConfig().SecondsPerSlot*uint64(params.BeaconConfig().SlotsPerEpoch)*3)-5) // 3 epochs -5 seconds
+		ts := uint64(time.Now().Add(-1 * overExpirationPadTime).Unix())
+		isExpired, err := RegistrationTimeStampExpired(ts)
+		require.NoError(t, err)
+		require.Equal(t, false, isExpired)
+	})
+}
--- a/beacon-chain/core/altair/epoch_precompute.go
+++ b/beacon-chain/core/altair/epoch_precompute.go
@@ -13,15 +13,6 @@ import (
 	"go.opencensus.io/trace"
 )

-// AttDelta contains rewards and penalties for a single attestation.
-type AttDelta struct {
-	HeadReward    uint64
-	SourceReward  uint64
-	SourcePenalty uint64
-	TargetReward  uint64
-	TargetPenalty uint64
-}
-
 // InitializePrecomputeValidators precomputes individual validator for its attested balances and the total sum of validators attested balances of the epoch.
 func InitializePrecomputeValidators(ctx context.Context, beaconState state.BeaconState) ([]*precompute.Validator, *precompute.Balance, error) {
 	ctx, span := trace.StartSpan(ctx, "altair.InitializePrecomputeValidators")
@@ -235,7 +226,7 @@ func ProcessRewardsAndPenaltiesPrecompute(
 		return beaconState, errors.New("validator registries not the same length as state's validator registries")
 	}

-	attDeltas, err := AttestationsDelta(beaconState, bal, vals)
+	attsRewards, attsPenalties, err := AttestationsDelta(beaconState, bal, vals)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not get attestation delta")
 	}
@@ -246,12 +237,11 @@ func ProcessRewardsAndPenaltiesPrecompute(

 		// Compute the post balance of the validator after accounting for the
 		// attester and proposer rewards and penalties.
-		delta := attDeltas[i]
-		balances[i], err = helpers.IncreaseBalanceWithVal(balances[i], delta.HeadReward+delta.SourceReward+delta.TargetReward)
+		balances[i], err = helpers.IncreaseBalanceWithVal(balances[i], attsRewards[i])
 		if err != nil {
 			return nil, err
 		}
-		balances[i] = helpers.DecreaseBalanceWithVal(balances[i], delta.SourcePenalty+delta.TargetPenalty)
+		balances[i] = helpers.DecreaseBalanceWithVal(balances[i], attsPenalties[i])

 		vals[i].AfterEpochTransitionBalance = balances[i]
 	}
@@ -265,8 +255,10 @@ func ProcessRewardsAndPenaltiesPrecompute(

 // AttestationsDelta computes and returns the rewards and penalties differences for individual validators based on the
 // voting records.
-func AttestationsDelta(beaconState state.BeaconState, bal *precompute.Balance, vals []*precompute.Validator) ([]*AttDelta, error) {
-	attDeltas := make([]*AttDelta, len(vals))
+func AttestationsDelta(beaconState state.BeaconState, bal *precompute.Balance, vals []*precompute.Validator) (rewards, penalties []uint64, err error) {
+	numOfVals := beaconState.NumValidators()
+	rewards = make([]uint64, numOfVals)
+	penalties = make([]uint64, numOfVals)

 	cfg := params.BeaconConfig()
 	prevEpoch := time.PrevEpoch(beaconState)
@@ -280,29 +272,29 @@ func AttestationsDelta(beaconState state.BeaconState, bal *precompute.Balance, v
 	bias := cfg.InactivityScoreBias
 	inactivityPenaltyQuotient, err := beaconState.InactivityPenaltyQuotient()
 	if err != nil {
-		return nil, err
+		return nil, nil, err
 	}
 	inactivityDenominator := bias * inactivityPenaltyQuotient

 	for i, v := range vals {
-		attDeltas[i], err = attestationDelta(bal, v, baseRewardMultiplier, inactivityDenominator, leak)
+		rewards[i], penalties[i], err = attestationDelta(bal, v, baseRewardMultiplier, inactivityDenominator, leak)
 		if err != nil {
-			return nil, err
+			return nil, nil, err
 		}
 	}

-	return attDeltas, nil
+	return rewards, penalties, nil
 }

 func attestationDelta(
 	bal *precompute.Balance,
 	val *precompute.Validator,
 	baseRewardMultiplier, inactivityDenominator uint64,
-	inactivityLeak bool) (*AttDelta, error) {
+	inactivityLeak bool) (reward, penalty uint64, err error) {
 	eligible := val.IsActivePrevEpoch || (val.IsSlashed && !val.IsWithdrawableCurrentEpoch)
 	// Per spec `ActiveCurrentEpoch` can't be 0 to process attestation delta.
 	if !eligible || bal.ActiveCurrentEpoch == 0 {
-		return &AttDelta{}, nil
+		return 0, 0, nil
 	}

 	cfg := params.BeaconConfig()
@@ -315,32 +307,32 @@ func attestationDelta(
 	srcWeight := cfg.TimelySourceWeight
 	tgtWeight := cfg.TimelyTargetWeight
 	headWeight := cfg.TimelyHeadWeight
-	attDelta := &AttDelta{}
+	reward, penalty = uint64(0), uint64(0)
 	// Process source reward / penalty
 	if val.IsPrevEpochSourceAttester && !val.IsSlashed {
 		if !inactivityLeak {
 			n := baseReward * srcWeight * (bal.PrevEpochAttested / increment)
-			attDelta.SourceReward += n / (activeIncrement * weightDenominator)
+			reward += n / (activeIncrement * weightDenominator)
 		}
 	} else {
-		attDelta.SourcePenalty += baseReward * srcWeight / weightDenominator
+		penalty += baseReward * srcWeight / weightDenominator
 	}

 	// Process target reward / penalty
 	if val.IsPrevEpochTargetAttester && !val.IsSlashed {
 		if !inactivityLeak {
 			n := baseReward * tgtWeight * (bal.PrevEpochTargetAttested / increment)
-			attDelta.TargetReward += n / (activeIncrement * weightDenominator)
+			reward += n / (activeIncrement * weightDenominator)
 		}
 	} else {
-		attDelta.TargetPenalty += baseReward * tgtWeight / weightDenominator
+		penalty += baseReward * tgtWeight / weightDenominator
 	}

 	// Process head reward / penalty
 	if val.IsPrevEpochHeadAttester && !val.IsSlashed {
 		if !inactivityLeak {
 			n := baseReward * headWeight * (bal.PrevEpochHeadAttested / increment)
-			attDelta.HeadReward += n / (activeIncrement * weightDenominator)
+			reward += n / (activeIncrement * weightDenominator)
 		}
 	}

@@ -349,10 +341,10 @@ func attestationDelta(
 	if !val.IsPrevEpochTargetAttester || val.IsSlashed {
 		n, err := math.Mul64(effectiveBalance, val.InactivityScore)
 		if err != nil {
-			return &AttDelta{}, err
+			return 0, 0, err
 		}
-		attDelta.TargetPenalty += n / inactivityDenominator
+		penalty += n / inactivityDenominator
 	}

-	return attDelta, nil
+	return reward, penalty, nil
 }
--- a/beacon-chain/core/altair/epoch_precompute_test.go
+++ b/beacon-chain/core/altair/epoch_precompute_test.go
@@ -213,16 +213,9 @@ func TestAttestationsDelta(t *testing.T) {
 	require.NoError(t, err)
 	validators, balance, err = ProcessEpochParticipation(context.Background(), s, balance, validators)
 	require.NoError(t, err)
-	deltas, err := AttestationsDelta(s, balance, validators)
+	rewards, penalties, err := AttestationsDelta(s, balance, validators)
 	require.NoError(t, err)

-	rewards := make([]uint64, len(deltas))
-	penalties := make([]uint64, len(deltas))
-	for i, d := range deltas {
-		rewards[i] = d.HeadReward + d.SourceReward + d.TargetReward
-		penalties[i] = d.SourcePenalty + d.TargetPenalty
-	}
-
 	// Reward amount should increase as validator index increases due to setup.
 	for i := 1; i < len(rewards); i++ {
 		require.Equal(t, true, rewards[i] > rewards[i-1])
@@ -251,16 +244,9 @@ func TestAttestationsDeltaBellatrix(t *testing.T) {
 	require.NoError(t, err)
 	validators, balance, err = ProcessEpochParticipation(context.Background(), s, balance, validators)
 	require.NoError(t, err)
-	deltas, err := AttestationsDelta(s, balance, validators)
+	rewards, penalties, err := AttestationsDelta(s, balance, validators)
 	require.NoError(t, err)

-	rewards := make([]uint64, len(deltas))
-	penalties := make([]uint64, len(deltas))
-	for i, d := range deltas {
-		rewards[i] = d.HeadReward + d.SourceReward + d.TargetReward
-		penalties[i] = d.SourcePenalty + d.TargetPenalty
-	}
-
 	// Reward amount should increase as validator index increases due to setup.
 	for i := 1; i < len(rewards); i++ {
 		require.Equal(t, true, rewards[i] > rewards[i-1])
@@ -299,15 +285,8 @@ func TestProcessRewardsAndPenaltiesPrecompute_Ok(t *testing.T) {
 	}

 	wanted := make([]uint64, s.NumValidators())
-	deltas, err := AttestationsDelta(s, balance, validators)
+	rewards, penalties, err := AttestationsDelta(s, balance, validators)
 	require.NoError(t, err)
-
-	rewards := make([]uint64, len(deltas))
-	penalties := make([]uint64, len(deltas))
-	for i, d := range deltas {
-		rewards[i] = d.HeadReward + d.SourceReward + d.TargetReward
-		penalties[i] = d.SourcePenalty + d.TargetPenalty
-	}
 	for i := range rewards {
 		wanted[i] += rewards[i]
 	}
--- a/beacon-chain/core/altair/sync_committee.go
+++ b/beacon-chain/core/altair/sync_committee.go
@@ -2,7 +2,6 @@ package altair

 import (
 	"context"
-	goErrors "errors"
 	"fmt"
 	"time"

@@ -23,10 +22,6 @@ import (

 const maxRandomByte = uint64(1<<8 - 1)

-var (
-	ErrTooLate = errors.New("sync message is too late")
-)
-
 // ValidateNilSyncContribution validates the following fields are not nil:
 // -the contribution and proof itself
 // -the message within contribution and proof
@@ -195,7 +190,6 @@ func IsSyncCommitteeAggregator(sig []byte) (bool, error) {
 }

 // ValidateSyncMessageTime validates sync message to ensure that the provided slot is valid.
-// Spec: [IGNORE] The message's slot is for the current slot (with a MAXIMUM_GOSSIP_CLOCK_DISPARITY allowance), i.e. sync_committee_message.slot == current_slot
 func ValidateSyncMessageTime(slot primitives.Slot, genesisTime time.Time, clockDisparity time.Duration) error {
 	if err := slots.ValidateClock(slot, uint64(genesisTime.Unix())); err != nil {
 		return err
@@ -223,19 +217,15 @@ func ValidateSyncMessageTime(slot primitives.Slot, genesisTime time.Time, clockD
 	upperBound := time.Now().Add(clockDisparity)
 	// Verify sync message slot is within the time range.
 	if messageTime.Before(lowerBound) || messageTime.After(upperBound) {
-		syncErr := fmt.Errorf(
-			"sync message time %v (message slot %d) not within allowable range of %v to %v (current slot %d)",
+		return fmt.Errorf(
+			"sync message time %v (slot %d) not within allowable range of %v (slot %d) to %v (slot %d)",
 			messageTime,
 			slot,
 			lowerBound,
+			uint64(lowerBound.Unix()-genesisTime.Unix())/params.BeaconConfig().SecondsPerSlot,
 			upperBound,
-			currentSlot,
+			uint64(upperBound.Unix()-genesisTime.Unix())/params.BeaconConfig().SecondsPerSlot,
 		)
-		// Wrap error message if sync message is too late.
-		if messageTime.Before(lowerBound) {
-			syncErr = goErrors.Join(ErrTooLate, syncErr)
-		}
-		return syncErr
 	}
 	return nil
 }
--- a/beacon-chain/core/altair/sync_committee_test.go
+++ b/beacon-chain/core/altair/sync_committee_test.go
@@ -311,7 +311,7 @@ func Test_ValidateSyncMessageTime(t *testing.T) {
 				syncMessageSlot: 16,
 				genesisTime:     prysmTime.Now().Add(-(15 * time.Duration(params.BeaconConfig().SecondsPerSlot) * time.Second)),
 			},
-			wantedErr: "(message slot 16) not within allowable range of",
+			wantedErr: "(slot 16) not within allowable range of",
 		},
 		{
 			name: "sync_message.slot == current_slot+CLOCK_DISPARITY",
@@ -327,7 +327,7 @@ func Test_ValidateSyncMessageTime(t *testing.T) {
 				syncMessageSlot: 100,
 				genesisTime:     prysmTime.Now().Add(-(100 * time.Duration(params.BeaconConfig().SecondsPerSlot) * time.Second) + params.BeaconNetworkConfig().MaximumGossipClockDisparity + 1000*time.Millisecond),
 			},
-			wantedErr: "(message slot 100) not within allowable range of",
+			wantedErr: "(slot 100) not within allowable range of",
 		},
 		{
 			name: "sync_message.slot == current_slot-CLOCK_DISPARITY",
@@ -343,7 +343,7 @@ func Test_ValidateSyncMessageTime(t *testing.T) {
 				syncMessageSlot: 101,
 				genesisTime:     prysmTime.Now().Add(-(100*time.Duration(params.BeaconConfig().SecondsPerSlot)*time.Second + params.BeaconNetworkConfig().MaximumGossipClockDisparity)),
 			},
-			wantedErr: "(message slot 101) not within allowable range of",
+			wantedErr: "(slot 101) not within allowable range of",
 		},
 		{
 			name: "sync_message.slot is well beyond current slot",
--- a/beacon-chain/core/blocks/payload.go
+++ b/beacon-chain/core/blocks/payload.go
@@ -61,7 +61,7 @@ func IsExecutionBlock(body interfaces.ReadOnlyBeaconBlockBody) (bool, error) {
 	}
 	payload, err := body.Execution()
 	switch {
-	case errors.Is(err, consensus_types.ErrUnsupportedField):
+	case errors.Is(err, consensus_types.ErrUnsupportedGetter):
 		return false, nil
 	case err != nil:
 		return false, err
--- a/beacon-chain/core/helpers/BUILD.bazel
+++ b/beacon-chain/core/helpers/BUILD.bazel
@@ -38,7 +38,6 @@ go_library(
        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
        "@com_github_prysmaticlabs_go_bitfield//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
-        "@io_opencensus_go//trace:go_default_library",
    ],
 )

@@ -69,6 +68,7 @@ go_test(
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//container/slice:go_default_library",
+        "//crypto/bls:go_default_library",
        "//crypto/hash:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
--- a/beacon-chain/core/helpers/attestation.go
+++ b/beacon-chain/core/helpers/attestation.go
@@ -8,16 +8,13 @@ import (

 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
+	"github.com/prysmaticlabs/prysm/v4/crypto/bls"
 	"github.com/prysmaticlabs/prysm/v4/crypto/hash"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	prysmTime "github.com/prysmaticlabs/prysm/v4/time"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
 )

-var (
-	ErrTooLate = errors.New("attestation is too late")
-)
-
 // ValidateNilAttestation checks if any composite field of input attestation is nil.
 // Access to these nil fields will result in run time panic,
 // it is recommended to run these checks as first line of defense.
@@ -69,6 +66,25 @@ func IsAggregator(committeeCount uint64, slotSig []byte) (bool, error) {
 	return binary.LittleEndian.Uint64(b[:8])%modulo == 0, nil
 }

+// AggregateSignature returns the aggregated signature of the input attestations.
+//
+// Spec pseudocode definition:
+//
+//	def get_aggregate_signature(attestations: Sequence[Attestation]) -> BLSSignature:
+//	 signatures = [attestation.signature for attestation in attestations]
+//	 return bls.Aggregate(signatures)
+func AggregateSignature(attestations []*ethpb.Attestation) (bls.Signature, error) {
+	sigs := make([]bls.Signature, len(attestations))
+	var err error
+	for i := 0; i < len(sigs); i++ {
+		sigs[i], err = bls.SignatureFromBytes(attestations[i].Signature)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return bls.AggregateSignatures(sigs), nil
+}
+
 // IsAggregated returns true if the attestation is an aggregated attestation,
 // false otherwise.
 func IsAggregated(attestation *ethpb.Attestation) bool {
@@ -167,11 +183,11 @@ func ValidateAttestationTime(attSlot primitives.Slot, genesisTime time.Time, clo
 		currentSlot,
 	)
 	if attTime.Before(lowerBounds) {
-		attReceivedTooLateCount.Inc()
-		return errors.Join(ErrTooLate, attError)
+		attReceivedTooEarlyCount.Inc()
+		return attError
 	}
 	if attTime.After(upperBounds) {
-		attReceivedTooEarlyCount.Inc()
+		attReceivedTooLateCount.Inc()
 		return attError
 	}
 	return nil
--- a/beacon-chain/core/helpers/attestation_test.go
+++ b/beacon-chain/core/helpers/attestation_test.go
@@ -10,6 +10,8 @@ import (
 	state_native "github.com/prysmaticlabs/prysm/v4/beacon-chain/state/state-native"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
+	"github.com/prysmaticlabs/prysm/v4/crypto/bls"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/testing/assert"
 	"github.com/prysmaticlabs/prysm/v4/testing/require"
@@ -43,6 +45,44 @@ func TestAttestation_IsAggregator(t *testing.T) {
 	})
 }

+func TestAttestation_AggregateSignature(t *testing.T) {
+	t.Run("verified", func(t *testing.T) {
+		pubkeys := make([]bls.PublicKey, 0, 100)
+		atts := make([]*ethpb.Attestation, 0, 100)
+		msg := bytesutil.ToBytes32([]byte("hello"))
+		for i := 0; i < 100; i++ {
+			priv, err := bls.RandKey()
+			require.NoError(t, err)
+			pub := priv.PublicKey()
+			sig := priv.Sign(msg[:])
+			pubkeys = append(pubkeys, pub)
+			att := &ethpb.Attestation{Signature: sig.Marshal()}
+			atts = append(atts, att)
+		}
+		aggSig, err := helpers.AggregateSignature(atts)
+		require.NoError(t, err)
+		assert.Equal(t, true, aggSig.FastAggregateVerify(pubkeys, msg), "Signature did not verify")
+	})
+
+	t.Run("not verified", func(t *testing.T) {
+		pubkeys := make([]bls.PublicKey, 0, 100)
+		atts := make([]*ethpb.Attestation, 0, 100)
+		msg := []byte("hello")
+		for i := 0; i < 100; i++ {
+			priv, err := bls.RandKey()
+			require.NoError(t, err)
+			pub := priv.PublicKey()
+			sig := priv.Sign(msg)
+			pubkeys = append(pubkeys, pub)
+			att := &ethpb.Attestation{Signature: sig.Marshal()}
+			atts = append(atts, att)
+		}
+		aggSig, err := helpers.AggregateSignature(atts[0 : len(atts)-2])
+		require.NoError(t, err)
+		assert.Equal(t, false, aggSig.FastAggregateVerify(pubkeys, bytesutil.ToBytes32(msg)), "Signature not suppose to verify")
+	})
+}
+
 func TestAttestation_ComputeSubnetForAttestation(t *testing.T) {
 	// Create 10 committees
 	committeeCount := uint64(10)
--- a/beacon-chain/core/helpers/beacon_committee.go
+++ b/beacon-chain/core/helpers/beacon_committee.go
@@ -336,21 +336,20 @@ func UpdateCommitteeCache(ctx context.Context, state state.ReadOnlyBeaconState,
 }

 // UpdateProposerIndicesInCache updates proposer indices entry of the committee cache.
-// Input state is used to retrieve active validator indices.
-// Input epoch is the epoch to retrieve proposer indices for.
-func UpdateProposerIndicesInCache(ctx context.Context, state state.ReadOnlyBeaconState, epoch primitives.Epoch) error {
+func UpdateProposerIndicesInCache(ctx context.Context, state state.ReadOnlyBeaconState) error {
 	// The cache uses the state root at the (current epoch - 1)'s slot as key. (e.g. for epoch 2, the key is root at slot 63)
 	// Which is the reason why we skip genesis epoch.
-	if epoch <= params.BeaconConfig().GenesisEpoch+params.BeaconConfig().MinSeedLookahead {
+	if time.CurrentEpoch(state) <= params.BeaconConfig().GenesisEpoch+params.BeaconConfig().MinSeedLookahead {
 		return nil
 	}

 	// Use state root from (current_epoch - 1))
-	s, err := slots.EpochEnd(epoch - 1)
+	wantedEpoch := time.PrevEpoch(state)
+	s, err := slots.EpochEnd(wantedEpoch)
 	if err != nil {
 		return err
 	}
-	r, err := state.StateRootAtIndex(uint64(s % params.BeaconConfig().SlotsPerHistoricalRoot))
+	r, err := StateRootAtSlot(state, s)
 	if err != nil {
 		return err
 	}
@@ -367,11 +366,11 @@ func UpdateProposerIndicesInCache(ctx context.Context, state state.ReadOnlyBeaco
 		return nil
 	}

-	indices, err := ActiveValidatorIndices(ctx, state, epoch)
+	indices, err := ActiveValidatorIndices(ctx, state, time.CurrentEpoch(state))
 	if err != nil {
 		return err
 	}
-	proposerIndices, err := precomputeProposerIndices(state, indices, epoch)
+	proposerIndices, err := precomputeProposerIndices(state, indices)
 	if err != nil {
 		return err
 	}
@@ -433,10 +432,11 @@ func computeCommittee(

 // This computes proposer indices of the current epoch and returns a list of proposer indices,
 // the index of the list represents the slot number.
-func precomputeProposerIndices(state state.ReadOnlyBeaconState, activeIndices []primitives.ValidatorIndex, e primitives.Epoch) ([]primitives.ValidatorIndex, error) {
+func precomputeProposerIndices(state state.ReadOnlyBeaconState, activeIndices []primitives.ValidatorIndex) ([]primitives.ValidatorIndex, error) {
 	hashFunc := hash.CustomSHA256Hasher()
 	proposerIndices := make([]primitives.ValidatorIndex, params.BeaconConfig().SlotsPerEpoch)

+	e := time.CurrentEpoch(state)
 	seed, err := Seed(state, e, params.BeaconConfig().DomainBeaconProposer)
 	if err != nil {
 		return nil, errors.Wrap(err, "could not generate seed")
--- a/beacon-chain/core/helpers/beacon_committee_test.go
+++ b/beacon-chain/core/helpers/beacon_committee_test.go
@@ -639,7 +639,7 @@ func TestPrecomputeProposerIndices_Ok(t *testing.T) {
 	indices, err := ActiveValidatorIndices(context.Background(), state, 0)
 	require.NoError(t, err)

-	proposerIndices, err := precomputeProposerIndices(state, indices, time.CurrentEpoch(state))
+	proposerIndices, err := precomputeProposerIndices(state, indices)
 	require.NoError(t, err)

 	var wantedProposerIndices []primitives.ValidatorIndex
--- a/beacon-chain/core/helpers/validators.go
+++ b/beacon-chain/core/helpers/validators.go
@@ -17,7 +17,6 @@ import (
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
 	log "github.com/sirupsen/logrus"
-	"go.opencensus.io/trace"
 )

 var CommitteeCacheInProgressHit = promauto.NewCounter(prometheus.CounterOpts{
@@ -262,7 +261,7 @@ func BeaconProposerIndex(ctx context.Context, state state.ReadOnlyBeaconState) (
 				}
 				return proposerIndices[state.Slot()%params.BeaconConfig().SlotsPerEpoch], nil
 			}
-			if err := UpdateProposerIndicesInCache(ctx, state, time.CurrentEpoch(state)); err != nil {
+			if err := UpdateProposerIndicesInCache(ctx, state); err != nil {
 				return 0, errors.Wrap(err, "could not update committee cache")
 			}
 		}
@@ -397,22 +396,3 @@ func isEligibleForActivation(activationEligibilityEpoch, activationEpoch, finali
 	return activationEligibilityEpoch <= finalizedEpoch &&
 		activationEpoch == params.BeaconConfig().FarFutureEpoch
 }
-
-// LastActivatedValidatorIndex provides the last activated validator given a state
-func LastActivatedValidatorIndex(ctx context.Context, st state.ReadOnlyBeaconState) (primitives.ValidatorIndex, error) {
-	_, span := trace.StartSpan(ctx, "helpers.LastActivatedValidatorIndex")
-	defer span.End()
-	var lastActivatedvalidatorIndex primitives.ValidatorIndex
-	// linear search because status are not sorted
-	for j := st.NumValidators() - 1; j >= 0; j-- {
-		val, err := st.ValidatorAtIndexReadOnly(primitives.ValidatorIndex(j))
-		if err != nil {
-			return 0, err
-		}
-		if IsActiveValidatorUsingTrie(val, time.CurrentEpoch(st)) {
-			lastActivatedvalidatorIndex = primitives.ValidatorIndex(j)
-			break
-		}
-	}
-	return lastActivatedvalidatorIndex, nil
-}
--- a/beacon-chain/core/helpers/validators_test.go
+++ b/beacon-chain/core/helpers/validators_test.go
@@ -727,26 +727,3 @@ func computeProposerIndexWithValidators(validators []*ethpb.Validator, activeInd
 		}
 	}
 }
-
-func TestLastActivatedValidatorIndex_OK(t *testing.T) {
-	beaconState, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{})
-	require.NoError(t, err)
-
-	validators := make([]*ethpb.Validator, 4)
-	balances := make([]uint64, len(validators))
-	for i := uint64(0); i < 4; i++ {
-		validators[i] = &ethpb.Validator{
-			PublicKey:             make([]byte, params.BeaconConfig().BLSPubkeyLength),
-			WithdrawalCredentials: make([]byte, 32),
-			EffectiveBalance:      32 * 1e9,
-			ExitEpoch:             params.BeaconConfig().FarFutureEpoch,
-		}
-		balances[i] = validators[i].EffectiveBalance
-	}
-	require.NoError(t, beaconState.SetValidators(validators))
-	require.NoError(t, beaconState.SetBalances(balances))
-
-	index, err := LastActivatedValidatorIndex(context.Background(), beaconState)
-	require.NoError(t, err)
-	require.Equal(t, index, primitives.ValidatorIndex(3))
-}
--- a/beacon-chain/core/validators/validator_test.go
+++ b/beacon-chain/core/validators/validator_test.go
@@ -150,7 +150,7 @@ func TestSlashValidator_OK(t *testing.T) {

 	maxBalance := params.BeaconConfig().MaxEffectiveBalance
 	slashedBalance := state.Slashings()[state.Slot().Mod(uint64(params.BeaconConfig().EpochsPerSlashingsVector))]
-	assert.Equal(t, maxBalance, slashedBalance, "Slashed balance isn't the expected amount")
+	assert.Equal(t, maxBalance, slashedBalance, "Slashed balance isnt the expected amount")

 	whistleblowerReward := slashedBalance / params.BeaconConfig().WhistleBlowerRewardQuotient
 	bal, err := state.BalanceAtIndex(proposer)
--- a/beacon-chain/db/kv/blocks_test.go
+++ b/beacon-chain/db/kv/blocks_test.go
@@ -543,7 +543,7 @@ func TestStore_Blocks_Retrieve_SlotRangeWithStep(t *testing.T) {
 			require.NoError(t, err)
 			assert.Equal(t, 150, len(retrieved))
 			for _, b := range retrieved {
-				assert.Equal(t, primitives.Slot(0), (b.Block().Slot()-100)%step, "Unexpected block slot %d", b.Block().Slot())
+				assert.Equal(t, primitives.Slot(0), (b.Block().Slot()-100)%step, "Unexpect block slot %d", b.Block().Slot())
 			}
 		})
 	}
--- a/beacon-chain/db/kv/migration_state_validators.go
+++ b/beacon-chain/db/kv/migration_state_validators.go
@@ -130,15 +130,9 @@ func performValidatorStateMigration(ctx context.Context, bar *progressbar.Progre
 				return err
 			}
 			item := enc
-			switch {
-			case hasAltairKey(enc):
+			if hasAltairKey(item) {
 				item = item[len(altairKey):]
-			case hasBellatrixKey(enc):
-				item = item[len(bellatrixKey):]
-			case hasCapellaKey(enc):
-				item = item[len(capellaKey):]
 			}
-
 			detector, err := detect.FromState(item)
 			if err != nil {
 				return err
@@ -171,14 +165,9 @@ func performValidatorStateMigration(ctx context.Context, bar *progressbar.Progre
 				return err
 			}
 			var stateBytes []byte
-			switch {
-			case hasAltairKey(enc):
+			if hasAltairKey(enc) {
 				stateBytes = snappy.Encode(nil, append(altairKey, rawObj...))
-			case hasBellatrixKey(enc):
-				stateBytes = snappy.Encode(nil, append(bellatrixKey, rawObj...))
-			case hasCapellaKey(enc):
-				stateBytes = snappy.Encode(nil, append(capellaKey, rawObj...))
-			default:
+			} else {
 				stateBytes = snappy.Encode(nil, rawObj)
 			}
 			if stateErr := stateBkt.Put(keys[index], stateBytes); stateErr != nil {
--- a/beacon-chain/db/kv/migration_state_validators_test.go
+++ b/beacon-chain/db/kv/migration_state_validators_test.go
@@ -313,217 +313,3 @@ func Test_migrateAltairStateValidators(t *testing.T) {
 		})
 	}
 }
-
-func Test_migrateBellatrixStateValidators(t *testing.T) {
-	tests := []struct {
-		name  string
-		setup func(t *testing.T, dbStore *Store, state state.BeaconState, vals []*v1alpha1.Validator)
-		eval  func(t *testing.T, dbStore *Store, state state.BeaconState, vals []*v1alpha1.Validator)
-	}{
-		{
-			name: "migrates validators and adds them to new buckets",
-			setup: func(t *testing.T, dbStore *Store, state state.BeaconState, vals []*v1alpha1.Validator) {
-				// create some new buckets that should be present for this migration
-				err := dbStore.db.Update(func(tx *bbolt.Tx) error {
-					_, err := tx.CreateBucketIfNotExists(stateValidatorsBucket)
-					assert.NoError(t, err)
-					_, err = tx.CreateBucketIfNotExists(blockRootValidatorHashesBucket)
-					assert.NoError(t, err)
-					return nil
-				})
-				assert.NoError(t, err)
-			},
-			eval: func(t *testing.T, dbStore *Store, state state.BeaconState, vals []*v1alpha1.Validator) {
-				// check whether the new buckets are present
-				err := dbStore.db.View(func(tx *bbolt.Tx) error {
-					valBkt := tx.Bucket(stateValidatorsBucket)
-					assert.NotNil(t, valBkt)
-					idxBkt := tx.Bucket(blockRootValidatorHashesBucket)
-					assert.NotNil(t, idxBkt)
-					return nil
-				})
-				assert.NoError(t, err)
-
-				// check if the migration worked
-				blockRoot := [32]byte{'A'}
-				rcvdState, err := dbStore.State(context.Background(), blockRoot)
-				assert.NoError(t, err)
-				require.DeepSSZEqual(t, rcvdState.ToProtoUnsafe(), state.ToProtoUnsafe(), "saved state with validators and retrieved state are not matching")
-
-				// find hashes of the validators that are set as part of the state
-				var hashes []byte
-				var individualHashes [][]byte
-				for _, val := range vals {
-					hash, hashErr := val.HashTreeRoot()
-					assert.NoError(t, hashErr)
-					hashes = append(hashes, hash[:]...)
-					individualHashes = append(individualHashes, hash[:])
-				}
-
-				// check if all the validators that were in the state, are stored properly in the validator bucket
-				pbState, err := state_native.ProtobufBeaconStateBellatrix(rcvdState.ToProtoUnsafe())
-				assert.NoError(t, err)
-				validatorsFoundCount := 0
-				for _, val := range pbState.Validators {
-					hash, hashErr := val.HashTreeRoot()
-					assert.NoError(t, hashErr)
-					found := false
-					for _, h := range individualHashes {
-						if bytes.Equal(hash[:], h) {
-							found = true
-						}
-					}
-					require.Equal(t, true, found)
-					validatorsFoundCount++
-				}
-				require.Equal(t, len(vals), validatorsFoundCount)
-
-				// check if the state validator indexes are stored properly
-				err = dbStore.db.View(func(tx *bbolt.Tx) error {
-					rcvdValhashBytes := tx.Bucket(blockRootValidatorHashesBucket).Get(blockRoot[:])
-					rcvdValHashes, sErr := snappy.Decode(nil, rcvdValhashBytes)
-					assert.NoError(t, sErr)
-					require.DeepEqual(t, hashes, rcvdValHashes)
-					return nil
-				})
-				assert.NoError(t, err)
-			},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			dbStore := setupDB(t)
-
-			// add a state with the given validators
-			vals := validators(10)
-			blockRoot := [32]byte{'A'}
-			st, _ := util.DeterministicGenesisStateBellatrix(t, 20)
-			err := st.SetFork(&v1alpha1.Fork{
-				PreviousVersion: params.BeaconConfig().AltairForkVersion,
-				CurrentVersion:  params.BeaconConfig().BellatrixForkVersion,
-				Epoch:           0,
-			})
-			require.NoError(t, err)
-			assert.NoError(t, st.SetSlot(100))
-			assert.NoError(t, st.SetValidators(vals))
-			assert.NoError(t, dbStore.SaveState(context.Background(), st, blockRoot))
-
-			// enable historical state representation flag to test this
-			resetCfg := features.InitWithReset(&features.Flags{
-				EnableHistoricalSpaceRepresentation: true,
-			})
-			defer resetCfg()
-
-			tt.setup(t, dbStore, st, vals)
-			assert.NoError(t, migrateStateValidators(context.Background(), dbStore.db), "migrateArchivedIndex(tx) error")
-			tt.eval(t, dbStore, st, vals)
-		})
-	}
-}
-
-func Test_migrateCapellaStateValidators(t *testing.T) {
-	tests := []struct {
-		name  string
-		setup func(t *testing.T, dbStore *Store, state state.BeaconState, vals []*v1alpha1.Validator)
-		eval  func(t *testing.T, dbStore *Store, state state.BeaconState, vals []*v1alpha1.Validator)
-	}{
-		{
-			name: "migrates validators and adds them to new buckets",
-			setup: func(t *testing.T, dbStore *Store, state state.BeaconState, vals []*v1alpha1.Validator) {
-				// create some new buckets that should be present for this migration
-				err := dbStore.db.Update(func(tx *bbolt.Tx) error {
-					_, err := tx.CreateBucketIfNotExists(stateValidatorsBucket)
-					assert.NoError(t, err)
-					_, err = tx.CreateBucketIfNotExists(blockRootValidatorHashesBucket)
-					assert.NoError(t, err)
-					return nil
-				})
-				assert.NoError(t, err)
-			},
-			eval: func(t *testing.T, dbStore *Store, state state.BeaconState, vals []*v1alpha1.Validator) {
-				// check whether the new buckets are present
-				err := dbStore.db.View(func(tx *bbolt.Tx) error {
-					valBkt := tx.Bucket(stateValidatorsBucket)
-					assert.NotNil(t, valBkt)
-					idxBkt := tx.Bucket(blockRootValidatorHashesBucket)
-					assert.NotNil(t, idxBkt)
-					return nil
-				})
-				assert.NoError(t, err)
-
-				// check if the migration worked
-				blockRoot := [32]byte{'A'}
-				rcvdState, err := dbStore.State(context.Background(), blockRoot)
-				assert.NoError(t, err)
-				require.DeepSSZEqual(t, rcvdState.ToProtoUnsafe(), state.ToProtoUnsafe(), "saved state with validators and retrieved state are not matching")
-
-				// find hashes of the validators that are set as part of the state
-				var hashes []byte
-				var individualHashes [][]byte
-				for _, val := range vals {
-					hash, hashErr := val.HashTreeRoot()
-					assert.NoError(t, hashErr)
-					hashes = append(hashes, hash[:]...)
-					individualHashes = append(individualHashes, hash[:])
-				}
-
-				// check if all the validators that were in the state, are stored properly in the validator bucket
-				pbState, err := state_native.ProtobufBeaconStateCapella(rcvdState.ToProtoUnsafe())
-				assert.NoError(t, err)
-				validatorsFoundCount := 0
-				for _, val := range pbState.Validators {
-					hash, hashErr := val.HashTreeRoot()
-					assert.NoError(t, hashErr)
-					found := false
-					for _, h := range individualHashes {
-						if bytes.Equal(hash[:], h) {
-							found = true
-						}
-					}
-					require.Equal(t, true, found)
-					validatorsFoundCount++
-				}
-				require.Equal(t, len(vals), validatorsFoundCount)
-
-				// check if the state validator indexes are stored properly
-				err = dbStore.db.View(func(tx *bbolt.Tx) error {
-					rcvdValhashBytes := tx.Bucket(blockRootValidatorHashesBucket).Get(blockRoot[:])
-					rcvdValHashes, sErr := snappy.Decode(nil, rcvdValhashBytes)
-					assert.NoError(t, sErr)
-					require.DeepEqual(t, hashes, rcvdValHashes)
-					return nil
-				})
-				assert.NoError(t, err)
-			},
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			dbStore := setupDB(t)
-
-			// add a state with the given validators
-			vals := validators(10)
-			blockRoot := [32]byte{'A'}
-			st, _ := util.DeterministicGenesisStateCapella(t, 20)
-			err := st.SetFork(&v1alpha1.Fork{
-				PreviousVersion: params.BeaconConfig().BellatrixForkVersion,
-				CurrentVersion:  params.BeaconConfig().CapellaForkVersion,
-				Epoch:           0,
-			})
-			require.NoError(t, err)
-			assert.NoError(t, st.SetSlot(100))
-			assert.NoError(t, st.SetValidators(vals))
-			assert.NoError(t, dbStore.SaveState(context.Background(), st, blockRoot))
-
-			// enable historical state representation flag to test this
-			resetCfg := features.InitWithReset(&features.Flags{
-				EnableHistoricalSpaceRepresentation: true,
-			})
-			defer resetCfg()
-
-			tt.setup(t, dbStore, st, vals)
-			assert.NoError(t, migrateStateValidators(context.Background(), dbStore.db), "migrateArchivedIndex(tx) error")
-			tt.eval(t, dbStore, st, vals)
-		})
-	}
-}
--- a/beacon-chain/execution/BUILD.bazel
+++ b/beacon-chain/execution/BUILD.bazel
@@ -14,6 +14,7 @@ go_library(
        "metrics.go",
        "options.go",
        "prometheus.go",
+        "provider.go",
        "rpc_connection.go",
        "service.go",
    ],
@@ -89,6 +90,7 @@ go_test(
        "init_test.go",
        "log_processing_test.go",
        "prometheus_test.go",
+        "provider_test.go",
        "service_test.go",
    ],
    data = glob(["testdata/**"]),
@@ -120,6 +122,7 @@ go_test(
        "//crypto/bls:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//monitoring/clientstats: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",
--- a/beacon-chain/execution/engine_client.go
+++ b/beacon-chain/execution/engine_client.go
@@ -555,8 +555,11 @@ func (s *Service) ReconstructFullBlock(
 	// If the payload header has a block hash of 0x0, it means we are pre-merge and should
 	// simply return the block with an empty execution payload.
 	if bytes.Equal(header.BlockHash(), params.BeaconConfig().ZeroHash[:]) {
-		payload := buildEmptyExecutionPayload()
-		return blocks.BuildSignedBeaconBlockFromExecutionPayload(blindedBlock, payload)
+		payload, err := buildEmptyExecutionPayloadForBlock(blindedBlock)
+		if err != nil {
+			return nil, err
+		}
+		return blocks.BuildSignedBeaconBlockFromExecutionPayload(blindedBlock, payload.Proto())
 	}

 	executionBlockHash := common.BytesToHash(header.BlockHash())
@@ -649,8 +652,12 @@ func (s *Service) ReconstructFullBellatrixBlockBatch(
 	// For blocks that are pre-merge we simply reconstruct them via an empty
 	// execution payload.
 	for _, realIdx := range zeroExecPayloads {
-		payload := buildEmptyExecutionPayload()
-		fullBlock, err := blocks.BuildSignedBeaconBlockFromExecutionPayload(blindedBlocks[realIdx], payload)
+		b := blindedBlocks[realIdx]
+		payload, err := buildEmptyExecutionPayloadForBlock(b)
+		if err != nil {
+			return nil, err
+		}
+		fullBlock, err := blocks.BuildSignedBeaconBlockFromExecutionPayload(b, payload.Proto())
 		if err != nil {
 			return nil, err
 		}
@@ -806,18 +813,39 @@ func tDStringToUint256(td string) (*uint256.Int, error) {
 	return i, nil
 }

-func buildEmptyExecutionPayload() *pb.ExecutionPayload {
-	return &pb.ExecutionPayload{
-		ParentHash:    make([]byte, fieldparams.RootLength),
-		FeeRecipient:  make([]byte, fieldparams.FeeRecipientLength),
-		StateRoot:     make([]byte, fieldparams.RootLength),
-		ReceiptsRoot:  make([]byte, fieldparams.RootLength),
-		LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
-		PrevRandao:    make([]byte, fieldparams.RootLength),
-		BaseFeePerGas: make([]byte, fieldparams.RootLength),
-		BlockHash:     make([]byte, fieldparams.RootLength),
-		Transactions:  make([][]byte, 0),
-		ExtraData:     make([]byte, 0),
+var errEmptyPayloadUnknownBlock = errors.New("cannot build empty payload for block version")
+
+func buildEmptyExecutionPayloadForBlock(b interfaces.ReadOnlySignedBeaconBlock) (interfaces.ExecutionData, error) {
+	switch b.Version() {
+	case version.Bellatrix:
+		return blocks.WrappedExecutionPayload(&pb.ExecutionPayload{
+			ParentHash:    make([]byte, fieldparams.RootLength),
+			FeeRecipient:  make([]byte, fieldparams.FeeRecipientLength),
+			StateRoot:     make([]byte, fieldparams.RootLength),
+			ReceiptsRoot:  make([]byte, fieldparams.RootLength),
+			LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
+			PrevRandao:    make([]byte, fieldparams.RootLength),
+			BaseFeePerGas: make([]byte, fieldparams.RootLength),
+			BlockHash:     make([]byte, fieldparams.RootLength),
+			Transactions:  make([][]byte, 0),
+			ExtraData:     make([]byte, 0),
+		})
+	case version.Capella:
+		return blocks.WrappedExecutionPayloadCapella(&pb.ExecutionPayloadCapella{
+			ParentHash:    make([]byte, fieldparams.RootLength),
+			FeeRecipient:  make([]byte, fieldparams.FeeRecipientLength),
+			StateRoot:     make([]byte, fieldparams.RootLength),
+			ReceiptsRoot:  make([]byte, fieldparams.RootLength),
+			LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
+			PrevRandao:    make([]byte, fieldparams.RootLength),
+			BaseFeePerGas: make([]byte, fieldparams.RootLength),
+			BlockHash:     make([]byte, fieldparams.RootLength),
+			Transactions:  make([][]byte, 0),
+			ExtraData:     make([]byte, 0),
+			Withdrawals:   make([]*pb.Withdrawal, 0),
+		}, 0)
+	default:
+		return nil, errors.Wrapf(errEmptyPayloadUnknownBlock, "block version=%s", version.String(b.Version()))
 	}
 }

--- a/beacon-chain/execution/engine_client_fuzz_test.go
+++ b/beacon-chain/execution/engine_client_fuzz_test.go
@@ -115,32 +115,28 @@ func FuzzExchangeTransitionConfiguration(f *testing.F) {

 func FuzzExecutionPayload(f *testing.F) {
 	logsBloom := [256]byte{'j', 'u', 'n', 'k'}
-	execData := &engine.ExecutionPayloadEnvelope{
-		ExecutionPayload: &engine.ExecutableData{
-			ParentHash:    common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
-			FeeRecipient:  common.Address([20]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF}),
-			StateRoot:     common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
-			ReceiptsRoot:  common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
-			LogsBloom:     logsBloom[:],
-			Random:        common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
-			Number:        math.MaxUint64,
-			GasLimit:      math.MaxUint64,
-			GasUsed:       math.MaxUint64,
-			Timestamp:     100,
-			ExtraData:     nil,
-			BaseFeePerGas: big.NewInt(math.MaxInt),
-			BlockHash:     common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
-			Transactions:  [][]byte{{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}, {0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}, {0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}, {0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}},
-			Withdrawals:   []*types.Withdrawal{},
-		},
-		BlockValue: nil,
+	execData := &engine.ExecutableData{
+		ParentHash:    common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
+		FeeRecipient:  common.Address([20]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF}),
+		StateRoot:     common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
+		ReceiptsRoot:  common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
+		LogsBloom:     logsBloom[:],
+		Random:        common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
+		Number:        math.MaxUint64,
+		GasLimit:      math.MaxUint64,
+		GasUsed:       math.MaxUint64,
+		Timestamp:     100,
+		ExtraData:     nil,
+		BaseFeePerGas: big.NewInt(math.MaxInt),
+		BlockHash:     common.Hash([32]byte{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}),
+		Transactions:  [][]byte{{0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}, {0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}, {0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}, {0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01, 0xFF, 0x01}},
 	}
 	output, err := json.Marshal(execData)
 	assert.NoError(f, err)
 	f.Add(output)
 	f.Fuzz(func(t *testing.T, jsonBlob []byte) {
-		gethResp := &engine.ExecutionPayloadEnvelope{}
-		prysmResp := &pb.ExecutionPayloadCapellaWithValue{}
+		gethResp := &engine.ExecutableData{}
+		prysmResp := &pb.ExecutionPayload{}
 		gethErr := json.Unmarshal(jsonBlob, gethResp)
 		prysmErr := json.Unmarshal(jsonBlob, prysmResp)
 		assert.Equal(t, gethErr != nil, prysmErr != nil, fmt.Sprintf("geth and prysm unmarshaller return inconsistent errors. %v and %v", gethErr, prysmErr))
@@ -151,10 +147,10 @@ func FuzzExecutionPayload(f *testing.F) {
 		gethBlob, gethErr := json.Marshal(gethResp)
 		prysmBlob, prysmErr := json.Marshal(prysmResp)
 		assert.Equal(t, gethErr != nil, prysmErr != nil, "geth and prysm unmarshaller return inconsistent errors")
-		newGethResp := &engine.ExecutionPayloadEnvelope{}
+		newGethResp := &engine.ExecutableData{}
 		newGethErr := json.Unmarshal(prysmBlob, newGethResp)
 		assert.NoError(t, newGethErr)
-		newGethResp2 := &engine.ExecutionPayloadEnvelope{}
+		newGethResp2 := &engine.ExecutableData{}
 		newGethErr = json.Unmarshal(gethBlob, newGethResp2)
 		assert.NoError(t, newGethErr)

--- a/beacon-chain/execution/options.go
+++ b/beacon-chain/execution/options.go
@@ -7,7 +7,6 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state/stategen"
-	"github.com/prysmaticlabs/prysm/v4/network"
 	"github.com/prysmaticlabs/prysm/v4/network/authorization"
 )

@@ -16,7 +15,7 @@ type Option func(s *Service) error
 // WithHttpEndpoint parse http endpoint for the powchain service to use.
 func WithHttpEndpoint(endpointString string) Option {
 	return func(s *Service) error {
-		s.cfg.currHttpEndpoint = network.HttpEndpoint(endpointString)
+		s.cfg.currHttpEndpoint = HttpEndpoint(endpointString)
 		return nil
 	}
 }
@@ -28,7 +27,7 @@ func WithHttpEndpointAndJWTSecret(endpointString string, secret []byte) Option {
 			return nil
 		}
 		// Overwrite authorization type for all endpoints to be of a bearer type.
-		hEndpoint := network.HttpEndpoint(endpointString)
+		hEndpoint := HttpEndpoint(endpointString)
 		hEndpoint.Auth.Method = authorization.Bearer
 		hEndpoint.Auth.Value = string(secret)

--- a/beacon-chain/execution/prometheus_test.go
+++ b/beacon-chain/execution/prometheus_test.go
@@ -15,7 +15,7 @@ import (
 func TestCleanup(t *testing.T) {
 	ctx := context.Background()
 	pc, err := NewPowchainCollector(ctx)
-	assert.NoError(t, err, "Unexpected error calling NewPowchainCollector")
+	assert.NoError(t, err, "Uxpected error caling NewPowchainCollector")
 	unregistered := pc.unregister()
 	assert.Equal(t, true, unregistered, "PowchainCollector.unregister did not return true (via prometheus.DefaultRegistry)")
 	// PowchainCollector is a prometheus.Collector, so we should be able to register it again
@@ -39,7 +39,7 @@ func TestCleanup(t *testing.T) {
 func TestCancelation(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	pc, err := NewPowchainCollector(ctx)
-	assert.NoError(t, err, "Unexpected error calling NewPowchainCollector")
+	assert.NoError(t, err, "Uxpected error caling NewPowchainCollector")
 	ticker := time.NewTicker(10 * time.Second)
 	cancel()
 	select {
--- a/beacon-chain/execution/provider.go
+++ b/beacon-chain/execution/provider.go
@@ -0,0 +1,49 @@
+package execution
+
+import (
+	"encoding/base64"
+	"strings"
+
+	"github.com/prysmaticlabs/prysm/v4/network"
+	"github.com/prysmaticlabs/prysm/v4/network/authorization"
+)
+
+// HttpEndpoint extracts an httputils.Endpoint from the provider parameter.
+func HttpEndpoint(eth1Provider string) network.Endpoint {
+	endpoint := network.Endpoint{
+		Url: "",
+		Auth: network.AuthorizationData{
+			Method: authorization.None,
+			Value:  "",
+		}}
+
+	authValues := strings.Split(eth1Provider, ",")
+	endpoint.Url = strings.TrimSpace(authValues[0])
+	if len(authValues) > 2 {
+		log.Errorf(
+			"ETH1 endpoint string can contain one comma for specifying the authorization header to access the provider."+
+				" String contains too many commas: %d. Skipping authorization.", len(authValues)-1)
+	} else if len(authValues) == 2 {
+		switch network.Method(strings.TrimSpace(authValues[1])) {
+		case authorization.Basic:
+			basicAuthValues := strings.Split(strings.TrimSpace(authValues[1]), " ")
+			if len(basicAuthValues) != 2 {
+				log.Errorf("Basic Authentication has incorrect format. Skipping authorization.")
+			} else {
+				endpoint.Auth.Method = authorization.Basic
+				endpoint.Auth.Value = base64.StdEncoding.EncodeToString([]byte(basicAuthValues[1]))
+			}
+		case authorization.Bearer:
+			bearerAuthValues := strings.Split(strings.TrimSpace(authValues[1]), " ")
+			if len(bearerAuthValues) != 2 {
+				log.Errorf("Bearer Authentication has incorrect format. Skipping authorization.")
+			} else {
+				endpoint.Auth.Method = authorization.Bearer
+				endpoint.Auth.Value = bearerAuthValues[1]
+			}
+		case authorization.None:
+			log.Errorf("Authorization has incorrect format or authorization type is not supported.")
+		}
+	}
+	return endpoint
+}
--- a/beacon-chain/execution/provider_test.go
+++ b/beacon-chain/execution/provider_test.go
@@ -0,0 +1,74 @@
+package execution
+
+import (
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/v4/network/authorization"
+	"github.com/prysmaticlabs/prysm/v4/testing/assert"
+	logTest "github.com/sirupsen/logrus/hooks/test"
+)
+
+func TestHttpEndpoint(t *testing.T) {
+	hook := logTest.NewGlobal()
+	url := "http://test"
+
+	t.Run("URL", func(t *testing.T) {
+		endpoint := HttpEndpoint(url)
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.None, endpoint.Auth.Method)
+	})
+	t.Run("URL with separator", func(t *testing.T) {
+		endpoint := HttpEndpoint(url + ",")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.None, endpoint.Auth.Method)
+	})
+	t.Run("URL with whitespace", func(t *testing.T) {
+		endpoint := HttpEndpoint("   " + url + "   ,")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.None, endpoint.Auth.Method)
+	})
+	t.Run("Basic auth", func(t *testing.T) {
+		endpoint := HttpEndpoint(url + ",Basic username:password")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.Basic, endpoint.Auth.Method)
+		assert.Equal(t, "dXNlcm5hbWU6cGFzc3dvcmQ=", endpoint.Auth.Value)
+	})
+	t.Run("Basic auth with whitespace", func(t *testing.T) {
+		endpoint := HttpEndpoint(url + ",   Basic username:password   ")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.Basic, endpoint.Auth.Method)
+		assert.Equal(t, "dXNlcm5hbWU6cGFzc3dvcmQ=", endpoint.Auth.Value)
+	})
+	t.Run("Basic auth with incorrect format", func(t *testing.T) {
+		hook.Reset()
+		endpoint := HttpEndpoint(url + ",Basic username:password foo")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.None, endpoint.Auth.Method)
+		assert.LogsContain(t, hook, "Skipping authorization")
+	})
+	t.Run("Bearer auth", func(t *testing.T) {
+		endpoint := HttpEndpoint(url + ",Bearer token")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.Bearer, endpoint.Auth.Method)
+		assert.Equal(t, "token", endpoint.Auth.Value)
+	})
+	t.Run("Bearer auth with whitespace", func(t *testing.T) {
+		endpoint := HttpEndpoint(url + ",   Bearer token   ")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.Bearer, endpoint.Auth.Method)
+		assert.Equal(t, "token", endpoint.Auth.Value)
+	})
+	t.Run("Bearer auth with incorrect format", func(t *testing.T) {
+		hook.Reset()
+		endpoint := HttpEndpoint(url + ",Bearer token foo")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.None, endpoint.Auth.Method)
+		assert.LogsContain(t, hook, "Skipping authorization")
+	})
+	t.Run("Too many separators", func(t *testing.T) {
+		endpoint := HttpEndpoint(url + ",Bearer token,foo")
+		assert.Equal(t, url, endpoint.Url)
+		assert.Equal(t, authorization.None, endpoint.Auth.Method)
+		assert.LogsContain(t, hook, "Skipping authorization")
+	})
+}
--- a/beacon-chain/execution/rpc_connection.go
+++ b/beacon-chain/execution/rpc_connection.go
@@ -3,6 +3,7 @@ package execution
 import (
 	"context"
 	"fmt"
+	"net/url"
 	"strings"
 	"time"

@@ -106,10 +107,26 @@ func (s *Service) retryExecutionClientConnection(ctx context.Context, err error)

 // Initializes an RPC connection with authentication headers.
 func (s *Service) newRPCClientWithAuth(ctx context.Context, endpoint network.Endpoint) (*gethRPC.Client, error) {
-	client, err := network.NewExecutionRPCClient(ctx, endpoint)
+	// Need to handle ipc and http
+	var client *gethRPC.Client
+	u, err := url.Parse(endpoint.Url)
 	if err != nil {
 		return nil, err
 	}
+	switch u.Scheme {
+	case "http", "https":
+		client, err = gethRPC.DialOptions(ctx, endpoint.Url, gethRPC.WithHTTPClient(endpoint.HttpClient()))
+		if err != nil {
+			return nil, err
+		}
+	case "", "ipc":
+		client, err = gethRPC.DialIPC(ctx, endpoint.Url)
+		if err != nil {
+			return nil, err
+		}
+	default:
+		return nil, fmt.Errorf("no known transport for URL scheme %q", u.Scheme)
+	}
 	if endpoint.Auth.Method != authorization.None {
 		header, err := endpoint.Auth.ToHeaderValue()
 		if err != nil {
--- a/beacon-chain/forkchoice/doubly-linked-tree/forkchoice.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/forkchoice.go
@@ -228,44 +228,10 @@ func (f *ForkChoice) AncestorRoot(ctx context.Context, root [32]byte, slot primi
 	return n.root, nil
 }

-// IsViableForCheckpoint returns whether the root passed is a checkpoint root for any
-// known chain in forkchoice.
-func (f *ForkChoice) IsViableForCheckpoint(cp *forkchoicetypes.Checkpoint) (bool, error) {
-	node, ok := f.store.nodeByRoot[cp.Root]
-	if !ok || node == nil {
-		return false, nil
-	}
-	epochStart, err := slots.EpochStart(cp.Epoch)
-	if err != nil {
-		return false, err
-	}
-	if node.slot > epochStart {
-		return false, nil
-	}
-
-	if len(node.children) == 0 {
-		return true, nil
-	}
-	if node.slot == epochStart {
-		return true, nil
-	}
-	nodeEpoch := slots.ToEpoch(node.slot)
-	if nodeEpoch >= cp.Epoch {
-		return false, nil
-	}
-	for _, child := range node.children {
-		if child.slot > epochStart {
-			return true, nil
-		}
-	}
-	return false, nil
-}
-
 // updateBalances updates the balances that directly voted for each block taking into account the
 // validators' latest votes.
 func (f *ForkChoice) updateBalances() error {
 	newBalances := f.justifiedBalances
-	zHash := params.BeaconConfig().ZeroHash

 	for index, vote := range f.votes {
 		// Skip if validator has been slashed
@@ -274,7 +240,7 @@ func (f *ForkChoice) updateBalances() error {
 		}
 		// Skip if validator has never voted for current root and next root (i.e. if the
 		// votes are zero hash aka genesis block), there's nothing to compute.
-		if vote.currentRoot == zHash && vote.nextRoot == zHash {
+		if vote.currentRoot == params.BeaconConfig().ZeroHash && vote.nextRoot == params.BeaconConfig().ZeroHash {
 			continue
 		}

@@ -294,7 +260,7 @@ func (f *ForkChoice) updateBalances() error {
 			// Ignore the vote if the root is not in fork choice
 			// store, that means we have not seen the block before.
 			nextNode, ok := f.store.nodeByRoot[vote.nextRoot]
-			if ok && vote.nextRoot != zHash {
+			if ok && vote.nextRoot != params.BeaconConfig().ZeroHash {
 				// Protection against nil node
 				if nextNode == nil {
 					return errors.Wrap(ErrNilNode, "could not update balances")
@@ -303,7 +269,7 @@ func (f *ForkChoice) updateBalances() error {
 			}

 			currentNode, ok := f.store.nodeByRoot[vote.currentRoot]
-			if ok && vote.currentRoot != zHash {
+			if ok && vote.currentRoot != params.BeaconConfig().ZeroHash {
 				// Protection against nil node
 				if currentNode == nil {
 					return errors.Wrap(ErrNilNode, "could not update balances")
@@ -628,12 +594,3 @@ func (f *ForkChoice) updateJustifiedBalances(ctx context.Context, root [32]byte)
 	f.store.committeeWeight /= uint64(params.BeaconConfig().SlotsPerEpoch)
 	return nil
 }
-
-// Slot returns the slot of the given root if it's known to forkchoice
-func (f *ForkChoice) Slot(root [32]byte) (primitives.Slot, error) {
-	n, ok := f.store.nodeByRoot[root]
-	if !ok || n == nil {
-		return 0, ErrNilNode
-	}
-	return n.slot, nil
-}
--- a/beacon-chain/forkchoice/doubly-linked-tree/forkchoice_test.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/forkchoice_test.go
@@ -754,110 +754,3 @@ func TestForkChoice_UnrealizedJustifiedPayloadBlockHash(t *testing.T) {
 	got := f.UnrealizedJustifiedPayloadBlockHash()
 	require.Equal(t, [32]byte{'A'}, got)
 }
-
-func TestForkChoiceIsViableForCheckpoint(t *testing.T) {
-	f := setup(0, 0)
-	ctx := context.Background()
-
-	st, root, err := prepareForkchoiceState(ctx, 0, [32]byte{'a'}, params.BeaconConfig().ZeroHash, [32]byte{'A'}, 0, 0)
-	require.NoError(t, err)
-	// No Node
-	viable, err := f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: root})
-	require.NoError(t, err)
-	require.Equal(t, false, viable)
-
-	// No Children
-	require.NoError(t, f.InsertNode(ctx, st, root))
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: root, Epoch: 0})
-	require.NoError(t, err)
-	require.Equal(t, true, viable)
-
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: root, Epoch: 1})
-	require.NoError(t, err)
-	require.Equal(t, true, viable)
-
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: root, Epoch: 2})
-	require.NoError(t, err)
-	require.Equal(t, true, viable)
-
-	st, broot, err := prepareForkchoiceState(ctx, 1, [32]byte{'b'}, root, [32]byte{'B'}, 0, 0)
-	require.NoError(t, err)
-	require.NoError(t, f.InsertNode(ctx, st, broot))
-
-	// Epoch start
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: root})
-	require.NoError(t, err)
-	require.Equal(t, true, viable)
-
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: root, Epoch: 1})
-	require.NoError(t, err)
-	require.Equal(t, false, viable)
-
-	// No Children but impossible checkpoint
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: broot})
-	require.NoError(t, err)
-	require.Equal(t, false, viable)
-
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: broot, Epoch: 1})
-	require.NoError(t, err)
-	require.Equal(t, true, viable)
-
-	st, croot, err := prepareForkchoiceState(ctx, 2, [32]byte{'c'}, broot, [32]byte{'C'}, 0, 0)
-	require.NoError(t, err)
-	require.NoError(t, f.InsertNode(ctx, st, croot))
-
-	// Children in same epoch
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: broot})
-	require.NoError(t, err)
-	require.Equal(t, false, viable)
-
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: broot, Epoch: 1})
-	require.NoError(t, err)
-	require.Equal(t, false, viable)
-
-	st, droot, err := prepareForkchoiceState(ctx, params.BeaconConfig().SlotsPerEpoch, [32]byte{'d'}, broot, [32]byte{'D'}, 0, 0)
-	require.NoError(t, err)
-	require.NoError(t, f.InsertNode(ctx, st, droot))
-
-	// Children in next epoch but boundary
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: broot})
-	require.NoError(t, err)
-	require.Equal(t, false, viable)
-
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: broot, Epoch: 1})
-	require.NoError(t, err)
-	require.Equal(t, false, viable)
-
-	// Boundary block
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: droot, Epoch: 1})
-	require.NoError(t, err)
-	require.Equal(t, true, viable)
-
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: droot, Epoch: 0})
-	require.NoError(t, err)
-	require.Equal(t, false, viable)
-
-	// Children in next epoch
-	st, eroot, err := prepareForkchoiceState(ctx, params.BeaconConfig().SlotsPerEpoch+1, [32]byte{'e'}, broot, [32]byte{'E'}, 0, 0)
-	require.NoError(t, err)
-	require.NoError(t, f.InsertNode(ctx, st, eroot))
-
-	viable, err = f.IsViableForCheckpoint(&forkchoicetypes.Checkpoint{Root: broot, Epoch: 1})
-	require.NoError(t, err)
-	require.Equal(t, true, viable)
-}
-
-func TestForkChoiceSlot(t *testing.T) {
-	f := setup(0, 0)
-	ctx := context.Background()
-	st, root, err := prepareForkchoiceState(ctx, 3, [32]byte{'a'}, params.BeaconConfig().ZeroHash, [32]byte{'A'}, 0, 0)
-	require.NoError(t, err)
-	// No Node
-	_, err = f.Slot(root)
-	require.ErrorIs(t, ErrNilNode, err)
-
-	require.NoError(t, f.InsertNode(ctx, st, root))
-	slot, err := f.Slot(root)
-	require.NoError(t, err)
-	require.Equal(t, primitives.Slot(3), slot)
-}
--- a/beacon-chain/forkchoice/doubly-linked-tree/on_tick.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/on_tick.go
@@ -31,7 +31,9 @@ import (
 //	        store.justified_checkpoint = store.best_justified_checkpoint
 func (f *ForkChoice) NewSlot(ctx context.Context, slot primitives.Slot) error {
 	// Reset proposer boost root
-	f.store.proposerBoostRoot = [32]byte{}
+	if err := f.resetBoostedProposerRoot(ctx); err != nil {
+		return errors.Wrap(err, "could not reset boosted proposer root in fork choice")
+	}

 	// Return if it's not a new epoch.
 	if !slots.IsEpochStart(slot) {
--- a/beacon-chain/forkchoice/doubly-linked-tree/optimistic_sync.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/optimistic_sync.go
@@ -7,7 +7,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 )

-func (s *Store) setOptimisticToInvalid(ctx context.Context, root, parentRoot, lastValidHash [32]byte) ([][32]byte, error) {
+func (s *Store) setOptimisticToInvalid(ctx context.Context, root, parentRoot, payloadHash [32]byte) ([][32]byte, error) {
 	invalidRoots := make([][32]byte, 0)
 	node, ok := s.nodeByRoot[root]
 	if !ok {
@@ -16,7 +16,7 @@ func (s *Store) setOptimisticToInvalid(ctx context.Context, root, parentRoot, la
 			return invalidRoots, errors.Wrap(ErrNilNode, "could not set node to invalid")
 		}
 		// return early if the parent is LVH
-		if node.payloadHash == lastValidHash {
+		if node.payloadHash == payloadHash {
 			return invalidRoots, nil
 		}
 	} else {
@@ -28,7 +28,7 @@ func (s *Store) setOptimisticToInvalid(ctx context.Context, root, parentRoot, la
 		}
 	}
 	firstInvalid := node
-	for ; firstInvalid.parent != nil && firstInvalid.parent.payloadHash != lastValidHash; firstInvalid = firstInvalid.parent {
+	for ; firstInvalid.parent != nil && firstInvalid.parent.payloadHash != payloadHash; firstInvalid = firstInvalid.parent {
 		if ctx.Err() != nil {
 			return invalidRoots, ctx.Err()
 		}
--- a/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/proposer_boost.go
@@ -1,12 +1,19 @@
 package doublylinkedtree

 import (
+	"context"
 	"fmt"

 	fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 )

+// resetBoostedProposerRoot sets the value of the proposer boosted root to zeros.
+func (f *ForkChoice) resetBoostedProposerRoot(_ context.Context) error {
+	f.store.proposerBoostRoot = [32]byte{}
+	return nil
+}
+
 // applyProposerBoostScore applies the current proposer boost scores to the
 // relevant nodes.
 func (f *ForkChoice) applyProposerBoostScore() error {
--- a/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks.go
@@ -82,11 +82,6 @@ func (f *ForkChoice) ShouldOverrideFCU() (override bool) {
 	if head.weight*100 > f.store.committeeWeight*params.BeaconConfig().ReorgWeightThreshold {
 		return
 	}
-
-	// Only orphan a block if the parent LMD vote is strong
-	if parent.weight*100 < f.store.committeeWeight*params.BeaconConfig().ReorgParentWeightThreshold {
-		return
-	}
 	return true
 }

@@ -142,11 +137,6 @@ func (f *ForkChoice) GetProposerHead() [32]byte {
 		return head.root
 	}

-	// Only orphan a block if the parent LMD vote is strong
-	if parent.weight*100 < f.store.committeeWeight*params.BeaconConfig().ReorgParentWeightThreshold {
-		return head.root
-	}
-
 	// Only reorg if we are proposing early
 	secs, err := slots.SecondsSinceSlotStart(head.slot+1, f.store.genesisTime, uint64(time.Now().Unix()))
 	if err != nil {
--- a/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks_test.go
+++ b/beacon-chain/forkchoice/doubly-linked-tree/reorg_late_blocks_test.go
@@ -22,11 +22,7 @@ func TestForkChoice_ShouldOverrideFCU(t *testing.T) {
 	st, root, err := prepareForkchoiceState(ctx, 1, [32]byte{'a'}, [32]byte{}, [32]byte{'A'}, 0, 0)
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, st, root))
-	attesters := make([]uint64, f.numActiveValidators-64)
-	for i := range attesters {
-		attesters[i] = uint64(i + 64)
-	}
-	f.ProcessAttestation(ctx, attesters, root, 0)
+	f.ProcessAttestation(ctx, []uint64{0, 1, 2}, root, 0)

 	driftGenesisTime(f, 2, orphanLateBlockFirstThreshold+1)
 	st, root, err = prepareForkchoiceState(ctx, 2, [32]byte{'b'}, [32]byte{'a'}, [32]byte{'B'}, 0, 0)
@@ -84,12 +80,6 @@ func TestForkChoice_ShouldOverrideFCU(t *testing.T) {
 		require.Equal(t, false, f.ShouldOverrideFCU())
 		f.store.headNode.parent = saved
 	})
-	t.Run("parent is weak", func(t *testing.T) {
-		saved := f.store.headNode.parent.weight
-		f.store.headNode.parent.weight = 0
-		require.Equal(t, false, f.ShouldOverrideFCU())
-		f.store.headNode.parent.weight = saved
-	})
 	t.Run("Head is strong", func(t *testing.T) {
 		f.store.headNode.weight = f.store.committeeWeight
 		require.Equal(t, false, f.ShouldOverrideFCU())
@@ -111,11 +101,7 @@ func TestForkChoice_GetProposerHead(t *testing.T) {
 	st, root, err := prepareForkchoiceState(ctx, 1, parentRoot, [32]byte{}, [32]byte{'A'}, 0, 0)
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, st, root))
-	attesters := make([]uint64, f.numActiveValidators-64)
-	for i := range attesters {
-		attesters[i] = uint64(i + 64)
-	}
-	f.ProcessAttestation(ctx, attesters, root, 0)
+	f.ProcessAttestation(ctx, []uint64{0, 1, 2}, root, 0)

 	driftGenesisTime(f, 3, 1)
 	childRoot := [32]byte{'b'}
@@ -175,12 +161,6 @@ func TestForkChoice_GetProposerHead(t *testing.T) {
 		require.Equal(t, childRoot, f.GetProposerHead())
 		f.store.headNode.parent = saved
 	})
-	t.Run("parent is weak", func(t *testing.T) {
-		saved := f.store.headNode.parent.weight
-		f.store.headNode.parent.weight = 0
-		require.Equal(t, false, f.ShouldOverrideFCU())
-		f.store.headNode.parent.weight = saved
-	})
 	t.Run("Head is strong", func(t *testing.T) {
 		f.store.headNode.weight = f.store.committeeWeight
 		require.Equal(t, childRoot, f.GetProposerHead())
--- a/beacon-chain/forkchoice/interfaces.go
+++ b/beacon-chain/forkchoice/interfaces.go
@@ -53,7 +53,6 @@ type Getter interface {
 	CommonAncestor(ctx context.Context, root1 [32]byte, root2 [32]byte) ([32]byte, primitives.Slot, error)
 	IsCanonical(root [32]byte) bool
 	FinalizedCheckpoint() *forkchoicetypes.Checkpoint
-	IsViableForCheckpoint(*forkchoicetypes.Checkpoint) (bool, error)
 	FinalizedPayloadBlockHash() [32]byte
 	JustifiedCheckpoint() *forkchoicetypes.Checkpoint
 	PreviousJustifiedCheckpoint() *forkchoicetypes.Checkpoint
@@ -67,7 +66,6 @@ type Getter interface {
 	Tips() ([][32]byte, []primitives.Slot)
 	IsOptimistic(root [32]byte) (bool, error)
 	ShouldOverrideFCU() bool
-	Slot([32]byte) (primitives.Slot, error)
 }

 // Setter allows to set forkchoice information
--- a/beacon-chain/monitor/process_sync_committee.go
+++ b/beacon-chain/monitor/process_sync_committee.go
@@ -6,7 +6,6 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v4/runtime/version"
 	"github.com/sirupsen/logrus"
 )

@@ -30,9 +29,6 @@ func (s *Service) processSyncAggregate(state state.BeaconState, blk interfaces.R
 	if blk == nil || blk.Body() == nil {
 		return
 	}
-	if blk.Version() == version.Phase0 {
-		return
-	}
 	bits, err := blk.Body().SyncAggregate()
 	if err != nil {
 		log.WithError(err).Error("Could not get SyncAggregate")
--- a/beacon-chain/monitor/service.go
+++ b/beacon-chain/monitor/service.go
@@ -114,11 +114,19 @@ func (s *Service) Start() {
 		"ValidatorIndices": tracked,
 	}).Info("Starting service")

-	go s.run()
+	stateChannel := make(chan *feed.Event, 1)
+	stateSub := s.config.StateNotifier.StateFeed().Subscribe(stateChannel)
+
+	go s.run(stateChannel, stateSub)
 }

 // run waits until the beacon is synced and starts the monitoring system.
-func (s *Service) run() {
+func (s *Service) run(stateChannel chan *feed.Event, stateSub event.Subscription) {
+	if stateChannel == nil {
+		log.Error("State state is nil")
+		return
+	}
+
 	if err := s.waitForSync(s.config.InitialSyncComplete); err != nil {
 		log.WithError(err)
 		return
@@ -146,8 +154,6 @@ func (s *Service) run() {
 	s.isLogging = true
 	s.Unlock()

-	stateChannel := make(chan *feed.Event, 1)
-	stateSub := s.config.StateNotifier.StateFeed().Subscribe(stateChannel)
 	s.monitorRoutine(stateChannel, stateSub)
 }

--- a/beacon-chain/monitor/service_test.go
+++ b/beacon-chain/monitor/service_test.go
@@ -271,9 +271,11 @@ func TestWaitForSyncCanceled(t *testing.T) {
 func TestRun(t *testing.T) {
 	hook := logTest.NewGlobal()
 	s := setupService(t)
+	stateChannel := make(chan *feed.Event, 1)
+	stateSub := s.config.StateNotifier.StateFeed().Subscribe(stateChannel)

 	go func() {
-		s.run()
+		s.run(stateChannel, stateSub)
 	}()
 	close(s.config.InitialSyncComplete)

--- a/beacon-chain/node/node.go
+++ b/beacon-chain/node/node.go
@@ -230,13 +230,13 @@ func New(cliCtx *cli.Context, opts ...Option) (*BeaconNode, error) {
 		return nil, err
 	}

-	log.Debugln("Registering Deterministic Genesis Service")
-	if err := beacon.registerDeterministicGenesisService(); err != nil {
+	log.Debugln("Registering Determinstic Genesis Service")
+	if err := beacon.registerDeterminsticGenesisService(); err != nil {
 		return nil, err
 	}

 	log.Debugln("Registering Blockchain Service")
-	if err := beacon.registerBlockchainService(beacon.forkChoicer, synchronizer, beacon.initialSyncComplete); err != nil {
+	if err := beacon.registerBlockchainService(beacon.forkChoicer, synchronizer); err != nil {
 		return nil, err
 	}

@@ -581,8 +581,7 @@ func (b *BeaconNode) fetchBuilderService() *builder.Service {

 func (b *BeaconNode) registerAttestationPool() error {
 	s, err := attestations.NewService(b.ctx, &attestations.Config{
-		Pool:                b.attestationPool,
-		InitialSyncComplete: b.initialSyncComplete,
+		Pool: b.attestationPool,
 	})
 	if err != nil {
 		return errors.Wrap(err, "could not register atts pool service")
@@ -590,7 +589,7 @@ func (b *BeaconNode) registerAttestationPool() error {
 	return b.services.RegisterService(s)
 }

-func (b *BeaconNode) registerBlockchainService(fc forkchoice.ForkChoicer, gs *startup.ClockSynchronizer, syncComplete chan struct{}) error {
+func (b *BeaconNode) registerBlockchainService(fc forkchoice.ForkChoicer, gs *startup.ClockSynchronizer) error {
 	var web3Service *execution.Service
 	if err := b.services.FetchService(&web3Service); err != nil {
 		return err
@@ -621,7 +620,6 @@ func (b *BeaconNode) registerBlockchainService(fc forkchoice.ForkChoicer, gs *st
 		blockchain.WithFinalizedStateAtStartUp(b.finalizedStateAtStartUp),
 		blockchain.WithProposerIdsCache(b.proposerIdsCache),
 		blockchain.WithClockSynchronizer(gs),
-		blockchain.WithSyncComplete(syncComplete),
 	)

 	blockchainService, err := blockchain.NewService(b.ctx, opts...)
@@ -744,7 +742,6 @@ func (b *BeaconNode) registerSlasherService() error {
 		SlashingPoolInserter:    b.slashingsPool,
 		SyncChecker:             syncService,
 		HeadStateFetcher:        chainService,
-		ClockWaiter:             b.clockWaiter,
 	})
 	if err != nil {
 		return err
@@ -924,7 +921,7 @@ func (b *BeaconNode) registerGRPCGateway(router *mux.Router) error {
 	return b.services.RegisterService(g)
 }

-func (b *BeaconNode) registerDeterministicGenesisService() error {
+func (b *BeaconNode) registerDeterminsticGenesisService() error {
 	genesisTime := b.cliCtx.Uint64(flags.InteropGenesisTimeFlag.Name)
 	genesisValidators := b.cliCtx.Uint64(flags.InteropNumValidatorsFlag.Name)

@@ -987,8 +984,7 @@ func (b *BeaconNode) registerBuilderService(cliCtx *cli.Context) error {
 	opts := append(b.serviceFlagOpts.builderOpts,
 		builder.WithHeadFetcher(chainService),
 		builder.WithDatabase(b.db))
-	// make cache the default.
-	if !cliCtx.Bool(features.DisableRegistrationCache.Name) {
+	if cliCtx.Bool(flags.EnableRegistrationCache.Name) {
 		opts = append(opts, builder.WithRegistrationCache())
 	}
 	svc, err := builder.NewService(b.ctx, opts...)
--- a/beacon-chain/operations/attestations/BUILD.bazel
+++ b/beacon-chain/operations/attestations/BUILD.bazel
@@ -18,7 +18,6 @@ go_library(
    deps = [
        "//beacon-chain/operations/attestations/kv:go_default_library",
        "//cache/lru:go_default_library",
-        "//config/features:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//crypto/hash:go_default_library",
@@ -47,7 +46,6 @@ go_test(
    deps = [
        "//async:go_default_library",
        "//beacon-chain/operations/attestations/kv:go_default_library",
-        "//config/features:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//crypto/bls:go_default_library",
--- a/beacon-chain/operations/attestations/kv/BUILD.bazel
+++ b/beacon-chain/operations/attestations/kv/BUILD.bazel
@@ -14,7 +14,6 @@ go_library(
    visibility = ["//beacon-chain:__subpackages__"],
    deps = [
        "//beacon-chain/core/helpers:go_default_library",
-        "//config/features:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//crypto/hash:go_default_library",
@@ -40,8 +39,8 @@ go_test(
    ],
    embed = [":go_default_library"],
    deps = [
-        "//config/features:go_default_library",
        "//config/fieldparams:go_default_library",
+        "//consensus-types/primitives:go_default_library",
        "//crypto/bls:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//testing/assert:go_default_library",
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Kasey Kirkham	cf039d0602	remove commented code	2023-05-04 10:15:26 -05:00
Kasey Kirkham	0d108157e8	bump geth to latest	2023-05-04 10:13:53 -05:00
Kasey Kirkham	9491c74ef5	adapt genesis.json for post-merge conditions	2023-05-04 09:39:50 -05:00
Kasey Kirkham	177e24e432	avoid touching EL before startup	2023-05-03 21:06:24 -05:00
Kasey Kirkham	c2346cf283	upgrade geth to v1.11.5; breaking change in 1.11.6	2023-05-03 16:15:50 -05:00
Kasey Kirkham	fa7aa85877	fix block type scrambling for empty payloads	2023-05-03 16:11:20 -05:00
Kasey Kirkham	a6057f26dc	trying to upgrade geth for shanghai bugfix	2023-05-03 16:09:32 -05:00
@@ -1 +1 @@
 .2.1
 .1.0