fix build

fix
2026-01-11 14:28:09 -05:00 · 2023-05-17 13:34:20 +08:00 · 2023-05-17 13:03:08 +08:00
1683 changed files with 83396 additions and 129195 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
@@ -27,9 +26,31 @@ build:minimal --@io_bazel_rules_go//go/config:tags=minimal
 # Release flags
 build:release --compilation_mode=opt
 build:release --stamp
-build:release --define pgo_enabled=1
+
+# 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
@@ -38,13 +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 @@
-7.0.0
+6.1.0
--- a/.buildkite-bazelrc
+++ b/.buildkite-bazelrc
@@ -9,11 +9,10 @@
 #build:remote-cache --strategy=Genrule=standalone

 # Prysm specific remote-cache properties.
-build:remote-cache --remote_download_minimal
-build:remote-cache --remote_build_event_upload=minimal
+#build:remote-cache --disk_cache=
+build:remote-cache --remote_download_toplevel
 build:remote-cache --remote_cache=grpc://bazel-remote-cache:9092
-# Does not work with rules_oci. See https://github.com/bazel-contrib/rules_oci/issues/292
-#build:remote-cache --experimental_remote_downloader=grpc://bazel-remote-cache:9092
+build:remote-cache --experimental_remote_downloader=grpc://bazel-remote-cache:9092
 build:remote-cache --remote_local_fallback
 build:remote-cache --experimental_remote_cache_async
 build:remote-cache --experimental_remote_merkle_tree_cache
@@ -29,10 +28,7 @@ build --experimental_use_hermetic_linux_sandbox
 # Import workspace options.
 import %workspace%/.bazelrc

-# Enable blake3 once it is supported in remote cache. See: https://github.com/buchgr/bazel-remote/issues/710
-# startup --digest_function=blake3
-
-startup --host_jvm_args=-Xmx8g --host_jvm_args=-Xms4g
+startup --host_jvm_args=-Xmx4g --host_jvm_args=-Xms2g
 build --experimental_strict_action_env
 build --sandbox_tmpfs_path=/tmp
 build --verbose_failures
@@ -42,7 +38,6 @@ build --curses=no --color=no
 build --keep_going
 build --test_output=errors
 build --flaky_test_attempts=5
-build --build_runfile_links=false # Only build runfile symlink forest when required by local action, test, or run command.
 # Disabled race detection due to unstable test results under constrained environment build kite
 # build --features=race

--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@@ -0,0 +1,59 @@
+---
+name: "\U0001F41EBug report"
+about: Report a bug or problem with running Prysm
+---
+<!--💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎
+
+Hellooo! 😄 
+
+To help us tend to your issue faster, please search our currently open issues before submitting a new one.
+Existing issues often contain information about workarounds, resolution, or progress updates.
+
+💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎💎-->
+
+# 🐞 Bug Report
+
+### Description
+
+<!-- ✍️--> A clear and concise description of the problem...
+
+### Has this worked before in a previous version?
+
+<!-- Did this behavior use to work in the previous version? -->
+<!-- ✍️--> Yes, the previous version in which this bug was not present was: ....
+
+## 🔬 Minimal Reproduction
+
+<!--
+Please let us know how we can reproduce this issue. Include the exact method you used to run Prysm along with any flags used in your beacon chain and/or validator. Make sure you don't upload any confidential files or private keys.
+-->
+
+## 🔥 Error
+
+<pre><code>
+<!-- If the issue is accompanied by an error, please share the error logs with us below. If you have a lot of logs, place make a paste bin with your logs and share the link with us here: -->
+<!-- ✍️-->
+
+</code></pre>
+
+
+## 🌍  Your Environment
+
+**Operating System:**
+
+<pre>
+  <code>
+
+  </code>
+</pre>
+
+**What version of Prysm are you running? (Which release)**
+
+<pre>
+  <code>
+
+  </code>
+</pre>
+
+**Anything else relevant (validator index / public key)?**
+
--- a/.github/ISSUE_TEMPLATE/bug_report.yml
+++ b/.github/ISSUE_TEMPLATE/bug_report.yml
@@ -1,66 +0,0 @@
-name: 🐞 Bug report
-description: Report a bug or problem with running Prysm
-labels: ["Bug"]
-body:
-  - type: markdown
-    attributes:
-      value: |
-        To help us tend to your issue faster, please search our currently open issues before submitting a new one.
-        Existing issues often contain information about workarounds, resolution, or progress updates.
-  - type: textarea
-    id: what-happened
-    attributes:
-      label: Describe the bug
-      description: |
-        A clear and concise description of the problem...
-    validations:
-      required: true
-  - type: textarea
-    id: previous-version
-    attributes:
-      label: Has this worked before in a previous version?
-      description: Did this behavior use to work in the previous version?
-      render: text
-  - type: textarea
-    id: reproduction-steps
-    attributes:
-      label: 🔬 Minimal Reproduction
-      description: |
-        Please let us know how we can reproduce this issue. 
-        Include the exact method you used to run Prysm along with any flags used in your beacon chain and/or validator. 
-        Make sure you don't upload any confidential files or private keys.
-      placeholder: |
-        Steps to reproduce:
-        
-        1. Start '...'
-        2. Then '...'
-        3. Check '...'
-        4. See error
-  - type: textarea
-    id: errors
-    attributes:
-      label: Error
-      description: |
-        If the issue is accompanied by an error, please share the error logs with us below. 
-        If you have a lot of logs, place make a paste bin with your logs and share the link with us here:
-      render: text
-  - type: dropdown
-    id: platform
-    attributes:
-      label: Platform(s)
-      description: What platform(s) did this occur on?
-      multiple: true
-      options:
-        - Linux (x86)
-        - Linux (ARM)
-        - Mac (Intel)
-        - Mac (Apple Silicon)
-        - Windows (x86)
-        - Windows (ARM)
-  - type: input
-    attributes:
-      label: What version of Prysm are you running? (Which release)
-      description: You can check your Prysm version by running your beacon node or validator with the `--version` flag.
-  - type: textarea
-    attributes:
-      label: Anything else relevant (validator index / public key)?
--- a/.github/actions/gomodtidy/Dockerfile
+++ b/.github/actions/gomodtidy/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.21-alpine
+FROM golang:alpine

 COPY entrypoint.sh /entrypoint.sh

--- a/.github/workflows/fuzz.yml
+++ b/.github/workflows/fuzz.yml
@@ -1,45 +0,0 @@
-name: "fuzz"
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "0 12 * * *"
-
-permissions:
-  contents: write
-  pull-requests: write
-
-jobs:
-  list:
-    runs-on: ubuntu-latest
-    timeout-minutes: 180
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-go@v4
-        with:
-          go-version: '1.21.5'
-      - id: list
-        uses: shogo82148/actions-go-fuzz/list@v0
-        with:
-          tags: fuzz,develop
-    outputs:
-      fuzz-tests: ${{steps.list.outputs.fuzz-tests}}
-
-  fuzz:
-    runs-on: ubuntu-latest
-    timeout-minutes: 360
-    needs: list
-    strategy:
-      fail-fast: false
-      matrix:
-        include: ${{fromJson(needs.list.outputs.fuzz-tests)}}
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-go@v4
-        with:
-          go-version: '1.21.5'
-      - uses: shogo82148/actions-go-fuzz/run@v0
-        with:
-          packages: ${{ matrix.package }}
-          fuzz-regexp: ${{ matrix.func }}
-          fuzz-time: "20m"
-          tags: fuzz,develop
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -5,8 +5,6 @@ on:
    branches: [ master ]
  pull_request:
    branches: [ '*' ]
-  merge_group:
-    types: [checks_requested]

 jobs:
  formatting:
@@ -28,15 +26,15 @@ jobs:
    steps:
      - name: Checkout
        uses: actions/checkout@v2
-      - name: Set up Go 1.21
+      - name: Set up Go 1.20
        uses: actions/setup-go@v3
        with:
-          go-version: '1.21.5'
+          go-version: '1.20'
      - 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
-          gosec -exclude-generated -exclude=G307 -exclude-dir=crypto/bls/herumi ./...
+          gosec -exclude=G307 -exclude-dir=crypto/bls/herumi ./...

  lint:
    name: Lint
@@ -45,16 +43,16 @@ jobs:
      - name: Checkout
        uses: actions/checkout@v2

-      - name: Set up Go 1.21
+      - name: Set up Go 1.20
        uses: actions/setup-go@v3
        with:
-          go-version: '1.21.5'
+          go-version: '1.20'
          id: go

      - name: Golangci-lint
        uses: golangci/golangci-lint-action@v3
        with:
-          version: v1.55.2
+          version: v1.52.2
          args: --config=.golangci.yml --out-${NO_FUTURE}format colored-line-number

  build:
@@ -64,7 +62,7 @@ jobs:
      - name: Set up Go 1.x
        uses: actions/setup-go@v2
        with:
-          go-version: '1.21.5'
+          go-version: '1.20'
        id: go

      - name: Check out code into the Go module directory
@@ -77,14 +75,14 @@ jobs:
      - name: Build
        # Use blst tag to allow go and bazel builds for blst.
        run: go build -v ./...
-        env:
-           CGO_CFLAGS: "-O2 -D__BLST_PORTABLE__"
+        env: 
+           CGO_CFLAGS: "-O -D__BLST_PORTABLE__"
        # fuzz leverage go tag based stubs at compile time.
        # Building and testing with these tags should be checked and enforced at pre-submit.
      - name: Test for fuzzing
        run: go test  -tags=fuzz,develop ./...  -test.run=^Fuzz
-        env:
-           CGO_CFLAGS: "-O2 -D__BLST_PORTABLE__"
+        env: 
+           CGO_CFLAGS: "-O -D__BLST_PORTABLE__"

 # Tests run via Bazel for now...
 #      - name: Test
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -6,82 +6,21 @@ run:
    - proto
    - tools/analyzers
  timeout: 10m
-  go: '1.21.5'
+  go: '1.19'

 linters:
-  enable-all: true
-  disable:
-    # Deprecated linters:
-    - deadcode
-    - exhaustivestruct
-    - golint
-    - govet
-    - ifshort
-    - interfacer
-    - maligned
-    - nosnakecase
-    - scopelint
-    - structcheck
-    - varcheck
-
-    # Disabled for now:
-    - asasalint
-    - bodyclose
-    - containedctx
-    - contextcheck
-    - cyclop
-    - depguard
-    - dogsled
-    - dupl
-    - durationcheck
-    - errorlint
-    - exhaustive
-    - exhaustruct
-    - forbidigo
-    - forcetypeassert
-    - funlen
-    - gci
-    - gochecknoglobals
-    - gochecknoinits
-    - goconst
-    - gocritic
-    - gocyclo
-    - godot
-    - godox
-    - goerr113
-    - gofumpt
-    - gomnd
-    - gomoddirectives
-    - inamedparam
-    - interfacebloat
-    - ireturn
-    - lll
-    - maintidx
-    - makezero
-    - musttag
-    - nakedret
-    - nestif
-    - nilnil
-    - nlreturn
-    - noctx
-    - nolintlint
-    - nonamedreturns
-    - nosprintfhostport
-    - perfsprint
-    - prealloc
-    - predeclared
-    - promlinter
-    - protogetter
-    - revive
-    - staticcheck
-    - stylecheck
-    - tagalign
-    - tagliatelle
-    - thelper
-    - unparam
-    - varnamelen
-    - wrapcheck
-    - wsl
+  disable-all: true
+  enable:
+    - gofmt
+    - goimports
+    - unused
+    - errcheck
+    - gosimple
+    - gocognit
+    - dupword
+    - nilerr
+    - whitespace
+    - misspell

 linters-settings:
  gocognit:
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -3,8 +3,8 @@ 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")
-load("@prysm//tools/nogo_config:def.bzl", "nogo_config_exclude")

 prefix = "github.com/prysmaticlabs/prysm"

@@ -83,117 +83,38 @@ workspace_binary(
    cmd = "@com_github_golang_lint//golint",
 )

-STATICCHECK_ANALYZERS = [
-    # Enabled static checks. See https://staticcheck.dev/docs/checks/
-    # Please. keep this list sorted. Don't be a bad person by inserting stuff randomly.
-    "sa1000",
-    "sa1001",
-    "sa1002",
-    "sa1003",
-    "sa1004",
-    "sa1005",
-    "sa1006",
-    "sa1007",
-    "sa1008",
-    "sa1010",
-    "sa1011",
-    "sa1012",
-    "sa1013",
-    "sa1014",
-    "sa1015",
-    "sa1016",
-    "sa1017",
-    "sa1018",
-    # "sa1019", # TODO: Fix all uses of deprecated things.
-    "sa1020",
-    "sa1021",
-    "sa1023",
-    "sa1024",
-    "sa1025",
-    "sa1026",
-    "sa1027",
-    "sa1028",
-    "sa1029",
-    "sa1030",
-    "sa2000",
-    "sa2001",
-    "sa2002",
-    "sa2003",
-    "sa3000",
-    "sa3001",
-    "sa4000",
-    "sa4001",
-    "sa4003",
-    "sa4004",
-    "sa4005",
-    "sa4006",
-    "sa4008",
-    "sa4009",
-    "sa4010",
-    "sa4011",
-    "sa4012",
-    "sa4013",
-    "sa4014",
-    "sa4015",
-    "sa4016",
-    "sa4017",
-    "sa4018",
-    "sa4019",
-    "sa4020",
-    "sa4021",
-    "sa4022",
-    "sa4023",
-    "sa4024",
-    "sa4025",
-    "sa4026",
-    "sa4027",
-    "sa4028",
-    "sa4029",
-    "sa4030",
-    "sa4031",
-    "sa4032",
-    "sa5000",
-    "sa5001",
-    "sa5002",
-    "sa5003",
-    "sa5004",
-    "sa5005",
-    "sa5007",
-    "sa5008",
-    "sa5009",
-    "sa5010",
-    "sa5011",
-    "sa5012",
-    "sa6000",
-    "sa6001",
-    "sa6002",
-    "sa6003",
-    "sa6005",
-    "sa6006",
-    "sa9001",
-    "sa9002",
-    #"sa9003", # Doesn't build. See https://github.com/dominikh/go-tools/pull/1483
-    "sa9004",
-    "sa9005",
-    "sa9006",
-    "sa9007",
-    "sa9008",
-]
-
-nogo_config_exclude(
-    name = "nogo_config_with_excludes",
-    checks = [sa.upper() for sa in STATICCHECK_ANALYZERS],
-    exclude_files = [
-        "external/.*",
-    ],
-    input = "nogo_config.json",
-)
-
 nogo(
    name = "nogo",
-    config = ":nogo_config_with_excludes",
+    config = "nogo_config.json",
    visibility = ["//visibility:public"],
    deps = [
+        "@org_golang_x_tools//go/analysis/passes/unsafeptr:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/unreachable:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/unmarshal:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/tests:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/structtag:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/stdmethods:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/shift:go_default_library",
+        # "@org_golang_x_tools//go/analysis/passes/shadow:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/printf:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/pkgfact:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/nilness:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/nilfunc:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/loopclosure:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/httpresponse:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/findcall:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/deepequalerrors:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/ctrlflow:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/copylock:go_default_library",
+        #  "@org_golang_x_tools//go/analysis/passes/cgocall:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/buildtag:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/buildssa:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/bools:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/atomicalign:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/atomic:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/assign:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/inspect:go_default_library",
+        "@org_golang_x_tools//go/analysis/passes/asmdecl:go_default_library",
        "//tools/analyzers/comparesame:go_default_library",
        "//tools/analyzers/cryptorand:go_default_library",
        "//tools/analyzers/errcheck:go_default_library",
@@ -209,61 +130,14 @@ nogo(
        "//tools/analyzers/shadowpredecl:go_default_library",
        "//tools/analyzers/slicedirect:go_default_library",
        "//tools/analyzers/uintcast:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/appends:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/asmdecl:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/assign:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/atomic:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/atomicalign:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/bools:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/buildssa:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/buildtag:go_default_library",
-        # cgocall disabled
-        #"@org_golang_x_tools//go/analysis/passes/cgocall:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/copylock:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/ctrlflow:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/deepequalerrors:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/defers:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/directive:go_default_library",
-        # fieldalignment disabled
-        #"@org_golang_x_tools//go/analysis/passes/fieldalignment:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/findcall:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/framepointer:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/httpmux:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/httpresponse:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/ifaceassert:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/inspect:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/loopclosure:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/nilfunc:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/nilness:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/pkgfact:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/printf:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/reflectvaluecompare:go_default_library",
-        # shadow disabled
-        #"@org_golang_x_tools//go/analysis/passes/shadow:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/shift:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/sigchanyzer:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/slog:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/sortslice:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/stdmethods:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/stringintconv:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/structtag:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/testinggoroutine:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/tests:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/timeformat:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/unmarshal:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/unreachable:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/unsafeptr:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/unusedresult:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/unusedwrite:go_default_library",
-        "@org_golang_x_tools//go/analysis/passes/usesgenerics:go_default_library",
    ] + select({
        # nogo checks that fail with coverage enabled.
        ":coverage_enabled": [],
        "//conditions:default": [
-            "@org_golang_x_tools//go/analysis/passes/composite:go_default_library",
            "@org_golang_x_tools//go/analysis/passes/lostcancel:go_default_library",
+            "@org_golang_x_tools//go/analysis/passes/composite:go_default_library",
        ],
-    }) + ["@co_honnef_go_tools//staticcheck/%s:go_default_library" % c for c in STATICCHECK_ANALYZERS],
+    }),
 )

 config_setting(
@@ -271,11 +145,6 @@ config_setting(
    values = {"define": "coverage_enabled=1"},
 )

-config_setting(
-    name = "pgo_enabled",
-    values = {"define": "pgo_enabled=1"},
-)
-
 common_files = {
    "//:LICENSE.md": "LICENSE.md",
    "//:README.md": "README.md",
--- 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/MODULE.bazel
+++ b/MODULE.bazel
@@ -1,6 +0,0 @@
-###############################################################################
-# Bazel now uses Bzlmod by default to manage external dependencies.
-# Please consider migrating your external dependencies from WORKSPACE to MODULE.bazel.
-#
-# For more details, please check https://github.com/bazelbuild/bazel/issues/18958
-###############################################################################
--- a/MODULE.bazel.lock
+++ b/MODULE.bazel.lock
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 [![Discord](https://user-images.githubusercontent.com/7288322/34471967-1df7808a-efbb-11e7-9088-ed0b04151291.png)](https://discord.gg/prysmaticlabs)
 [![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/developers/docs/consensus-mechanisms/#proof-of-stake) [specification](https://github.com/ethereum/consensus-specs), developed by [Offchain Labs](https://www.offchainlabs.com). See the [Changelog](https://github.com/prysmaticlabs/prysm/releases) for details of the latest releases and upcoming breaking changes.
+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/TERMS_OF_SERVICE.md
+++ b/TERMS_OF_SERVICE.md
@@ -1,53 +1,45 @@
-# Terms of Use
-Effective as of November 2, 2023
+## Terms of Use

-By downloading, accessing or using the Prysm implementation (“Prysm”), you (referenced herein as “you” or the “user”) certify that you have read and agreed to the terms and conditions below (the “Terms”) which form a binding contract between you and Offchain Labs, Inc. (as successor in interest to Prysmatic Labs LLC) (referenced herein as “Offchain Labs”, “we” or “us”). If you do not agree to the Terms, do not download or use Prysm.  Additionally, the Terms of Use available at https://arbitrum.io/tos (or any successor site, the “OCL Terms of Use”) are hereby incorporated by reference into these Terms.  In the event of any conflict between provisions set forth herein and those set forth in the OCL Terms of Use, the provisions set forth herein shall control.
+Effective as of Oct 14, 2020

-## About Prysm
+By downloading, accessing or using the Prysm implementation (“Prysm”), you (referenced herein as “you” or the “user”) certify that you have read and agreed to the terms and conditions below (the “Terms”) which form a binding contract between you and Prysmatic Labs (referenced herein as “we” or “us”). If you do not agree to the Terms, do not download or use Prysm.

-Prysm is a client implementation for the Ethereum blockchain’s consensus protocol. To participate in the network, a user must send ETH from the Ethereum mainnet blockchain to a validator deposit smart contract on Ethereum mainnet. Validators participate in proposing and voting on blocks in the protocol, and the network applies rewards/penalties based on their behavior. A detailed set of installation and usage instructions as well as breakdowns of each individual component are available in the official documentation portal, however, we do not warrant the accuracy, completeness or usefulness of this documentation. Any reliance you place on such information is strictly at your own risk.
+### About Prysm
+Prysm is a client implementation for Ethereum consensus protocol for a proof-of-stake blockchain. To participate in the network, a user must send ETH from the Eth1.0 chain into a validator deposit contract, which will queue in the user as a validator in the system. Validators participate in proposing and voting on blocks in the protocol, and the network applies rewards/penalties based on their behavior. A detailed set of installation and usage instructions as well as breakdowns of each individual component are available in the official documentation portal, however, we do not warrant the accuracy, completeness or usefulness of this documentation. Any reliance you place on such information is strictly at your own risk.

-## Licensing Terms
-Prysm is an open-source software program licensed pursuant to the GNU General Public License v3.0.
-The Offchain Labs name, the term “Prysm” and all related names, logos, product and service names, designs and slogans are trademarks of Offchain Labs or its affiliates and/or licensors. You must not use such marks without our prior written permission.
-PLEASE READ THESE TERMS CAREFULLY, AS THE OCL TERMS OF USE INCORPORATED BY REFERENCE HEREIN CONTAIN AN AGREEMENT TO ARBITRATE AND OTHER IMPORTANT INFORMATION REGARDING YOUR LEGAL RIGHTS, REMEDIES, AND OBLIGATIONS. THE AGREEMENT TO ARBITRATE REQUIRES (WITH LIMITED EXCEPTION) THAT YOU SUBMIT CLAIMS YOU HAVE AGAINST US TO BINDING AND FINAL ARBITRATION, AND FURTHER (1) YOU WILL ONLY BE PERMITTED TO PURSUE CLAIMS AGAINST OFFCHAIN LABS ON AN INDIVIDUAL BASIS, NOT AS A PLAINTIFF OR CLASS MEMBER IN ANY CLASS OR REPRESENTATIVE ACTION OR PROCEEDING, (2) YOU WILL ONLY BE PERMITTED TO SEEK RELIEF (INCLUDING MONETARY, INJUNCTIVE, AND DECLARATORY RELIEF) ON AN INDIVIDUAL BASIS, AND (3) YOU MAY NOT BE ABLE TO HAVE ANY CLAIMS YOU HAVE AGAINST US RESOLVED BY A JURY OR IN A COURT OF LAW.
+### Licensing Terms
+Prysm is a fully open-source software program licensed pursuant to the GNU General Public License v3.0.

-## Risks of Operating Prysm
+The Prysmatic Labs name, the term “Prysm” and all related names, logos, product and service names, designs and slogans are trademarks of Prysmatic Labs or its affiliates and/or licensors. You must not use such marks without our prior written permission.

-The use of Prysm and acting as a validator on the Ethereum network can lead to loss of money, tokens and value. Ethereum is still an experimental system and ETH remains a risky investment. You alone are responsible for your actions on Prysm, including the security of your ETH and meeting any applicable minimum system requirements.
+### Risks of Operating Prysm
+The use of Prysm and acting as a validator on the Ethereum network can lead to loss of money. Ethereum is still an experimental system and ETH remains a risky investment. You alone are responsible for your actions on Prysm including the security of your ETH and meeting any applicable minimum system requirements.

 Use of Prysm and the ability to receive rewards or penalties may be affected at any time by mistakes made by the user or other users, software problems such as bugs, errors, incorrectly constructed transactions, unsafe cryptographic libraries or malware affecting the network, technical failures in the hardware of a user, security problems experienced by a user and/or actions or inactions of third parties and/or events experienced by third parties, among other risks. We cannot and do not guarantee that any user of Prysm will make money, that the Prysm network will operate in accordance with the documentation or that transactions will be effective or secure.

-YOU ACKNOWLEDGE THAT WE ARE NOT RESPONSIBLE FOR ANY RISKS ASSOCIATED WITH YOUR USE OF PRYSM, AND CANNOT BE HELD LIABLE FOR ANY RESULTING LOSSES THAT YOU EXPERIENCE WHILE ACCESSING OR USING PRYSM.
+We make no claims that Prysm is appropriate or permitted for use in any specific jurisdiction. Access to Prysm may not be legal by certain persons or in certain jurisdictions or countries. If you access Prysm, you do so on your own initiative and are responsible for compliance with local laws.

-BY ACCESSING AND USING PRYSM, YOU REPRESENT AND WARRANT THAT YOU UNDERSTAND THE INHERENT RISKS ASSOCIATED WITH USING CRYPTOGRAPHIC AND BLOCKCHAIN-BASED SYSTEMS, AND THAT YOU HAVE A WORKING KNOWLEDGE OF THE USAGE AND INTRICACIES OF DIGITAL ASSETS, SUCH AS THOSE FOLLOWING THE ETHEREUM TOKEN STANDARD (ERC-20). YOU FURTHER UNDERSTAND THAT THE MARKETS FOR DIGITAL ASSETS ARE HIGHLY VOLATILE DUE TO VARIOUS FACTORS, INCLUDING ADOPTION, SPECULATION, TECHNOLOGY, SECURITY, AND REGULATION. YOU ACKNOWLEDGE AND ACCEPT THAT THE COST AND SPEED OF TRANSACTING WITH CRYPTOGRAPHIC AND BLOCKCHAIN-BASED SYSTEMS SUCH AS ETHEREUM ARE VARIABLE AND MAY INCREASE DRAMATICALLY AT ANY TIME. YOU UNDERSTAND THAT ANYONE CAN CREATE A TOKEN, INCLUDING FAKE VERSIONS OF EXISTING TOKENS AND TOKENS THAT FALSELY CLAIM TO REPRESENT PROJECTS, AND ACKNOWLEDGE AND ACCEPT THE RISK THAT YOU MAY MISTAKENLY INTERACT WITH THOSE OR OTHER TOKENS. YOU FURTHER ACKNOWLEDGE THAT WE ARE NOT RESPONSIBLE FOR ANY OF THE VARIABLES OR RISKS DESCRIBED IN THESE TERMS. YOU UNDERSTAND AND AGREE TO ASSUME FULL RESPONSIBILITY FOR ALL OF THE RISKS OF ACCESSING AND USING PRYSM. YOU ARE SOLELY RESPONSIBLE FOR YOUR WALLETS, FOR SAFEGUARDING THE ASSOCIATED PRIVATE KEY AND FOR ANY ACTIVITY THAT OCCURS USING YOUR WALLET. WITHOUT LIMITING THE FOREGOING, YOU ALSO UNDERSTAND THAT THERE MAY BE TAX AND REGULATORY RISKS RELATED TO USING PRYSM. IT IS YOUR SOLE RESPONSIBILITY TO DETERMINE WHETHER, AND TO WHAT EXTENT, ANY TAXES APPLY TO ANY TRANSACTIONS YOU CONDUCT IN CONNECTION WITH YOUR USE OF PRYSM, AND TO WITHHOLD, COLLECT, REPORT AND REMIT THE CORRECT AMOUNTS OF TAXES TO THE APPROPRIATE TAX AUTHORITIES. DIGITAL ASSETS, BLOCKCHAIN TECHNOLOGY, AND ANY RELATED SOFTWARE AND SERVICES ARE ALSO SUBJECT TO LEGAL AND REGULATORY UNCERTAINTY IN THE UNITED STATES AND OTHER JURISDICTIONS. YOU UNDERSTAND THAT LEGISLATIVE AND REGULATORY CHANGES OR ACTIONS MAY ADVERSELY AFFECT THE USAGE, TRANSFERABILITY, TRANSACTABILITY AND ACCESSIBILITY RELATED TO PRYSM.
+Some Internet plans will charge an additional amount for any excess upload bandwidth used that isn’t included in the plan and may terminate your connection without warning because of overuse. We advise that you check whether your Internet connection is subjected to such limitations and monitor your bandwidth use so that you can stop Prysm before you reach your upload limit.

-We make no claims that Prysm is appropriate or permitted for use in any specific jurisdiction. Access to Prysm may not be legal by certain persons or in certain jurisdictions or countries. If you access Prysm, you do so on your own initiative and are responsible for compliance with all Applicable Law (as defined below), including, without limitation, for the avoidance of doubt, local laws.
+### Warranty Disclaimer
+PRYSM IS PROVIDED ON AN “AS-IS” BASIS AND MAY INCLUDE ERRORS, OMISSIONS, OR OTHER INACCURACIES. PRYSMATIC LABS AND ITS CONTRIBUTORS MAKE NO REPRESENTATIONS OR WARRANTIES ABOUT PRYSM FOR ANY PURPOSE, AND HEREBY EXPRESSLY DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT OR ANY OTHER IMPLIED WARRANTY UNDER THE UNIFORM COMPUTER INFORMATION TRANSACTIONS ACT AS ENACTED BY ANY STATE. WE ALSO MAKE NO REPRESENTATIONS OR WARRANTIES THAT PRYSM WILL OPERATE ERROR-FREE, UNINTERRUPTED, OR IN A MANNER THAT WILL MEET YOUR REQUIREMENTS AND/OR NEEDS. THEREFORE, YOU ASSUME THE ENTIRE RISK REGARDING THE QUALITY AND/OR PERFORMANCE OF PRYSM AND ANY TRANSACTIONS ENTERED INTO THEREON.

-Some Internet plans will charge additional amounts for bandwidth or any excess upload bandwidth used that isn’t included in the plan and may terminate your connection without warning because of overuse. We advise that you check whether your Internet connection is subjected to any such limitations and monitor your bandwidth use and upload volumes.
+### Limitation of Liability
+In no event will Prysmatic Labs or any of its contributors be liable, whether in contract, warranty, tort (including negligence, whether active, passive or imputed), product liability, strict liability or other theory, breach of statutory duty or otherwise arising out of, or in connection with, your use of Prysm, for any direct, indirect, incidental, special or consequential damages (including any loss of profits or data, business interruption or other pecuniary loss, or damage, loss or other compromise of data, in each case whether direct, indirect, incidental, special or consequential) arising out of use Prysm, even if we or other users have been advised of the possibility of such damages. The foregoing limitations and disclaimers shall apply to the maximum extent permitted by applicable law, even if any remedy fails of its essential purpose. You acknowledge and agree that the limitations of liability afforded us hereunder constitute a material and actual inducement and condition to entering into these Terms, and are reasonable, fair and equitable in scope to protect our legitimate interests in light of the fact that we are not receiving consideration from you for providing Prysm.

-## Warranty Disclaimer
+### Indemnification
+To the maximum extent permitted by law, you will defend, indemnify and hold Prysmatic Labs and its contributors harmless from and against any and all claims, actions, suits, investigations, or proceedings by any third party (including any party or purported party to or beneficiary or purported beneficiary of any transaction on Prysm), as well as any and all losses, liabilities,
+damages, costs, and expenses (including reasonable attorneys’ fees) arising out of, accruing from, or in any way related to (i) your breach of the terms of this Agreement, (ii) any transaction, or the failure to occur of any transaction on Prysm, and (iii) your negligence, fraud, or willful misconduct.

-PRYSM IS PROVIDED ON AN “AS-IS” BASIS AND MAY INCLUDE ERRORS, OMISSIONS, OR OTHER INACCURACIES. WITHOUT LIMITING ANYTHING SET FORTH ELSEWHERE IN THESE TERMS, OFFCHAIN LABS AND ITS CONTRIBUTORS MAKE NO REPRESENTATIONS OR WARRANTIES ABOUT PRYSM FOR ANY PURPOSE, AND HEREBY EXPRESSLY DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT OR ANY OTHER IMPLIED WARRANTY UNDER THE UNIFORM COMPUTER INFORMATION TRANSACTIONS ACT AS ENACTED BY ANY STATE OR OTHER GOVERNMENTAL AUTHORITY. WE ALSO MAKE NO REPRESENTATIONS OR WARRANTIES THAT PRYSM WILL OPERATE ERROR-FREE, UNINTERRUPTED, OR IN A MANNER THAT WILL MEET YOUR REQUIREMENTS AND/OR NEEDS. THEREFORE, YOU ASSUME THE ENTIRE RISK REGARDING THE QUALITY AND/OR PERFORMANCE OF PRYSM AND ANY TRANSACTIONS ENTERED INTO THEREON.
+### Compliance with Laws and Tax Obligations
+Your use of Prysm is subject to all applicable laws of any governmental authority, including, without limitation, federal, state and foreign securities laws, tax laws, tariff and trade laws, ordinances, judgments, decrees, injunctions, writs and orders or like actions of any governmental authority and rules, regulations, orders, interpretations, licenses, and permits of any federal,
+regional, state, county, municipal or other governmental authority and you agree to comply with all such laws in your use of Prysm. The users of Prysm are solely responsible to determinate what, if any, taxes apply to their ETH transactions. The owners of, or contributors to, Prysm are not responsible for determining the taxes that apply to ETH transactions.

-## Limitation of Liability
+### Miscellaneous
+These Terms will be construed and enforced in accordance with the laws of the state of Illinois as applied to agreements entered into and completely performed in Illinois. You agree to the personal jurisdiction by and venue in Illinois and waive any objection to such jurisdiction or venue.

-IN NO EVENT WILL OFFCHAIN LABS OR ANY OF ITS AFFILIATES OR ITS OR ANY SUCH AFFILIATE’S DIRECTORS, OFFICERS, EMPLOYEES, AGENTS, OR REPRESENTATIVES OR ANY CONTRIBUTORS (COLLECTIVELY, THE “OCL PARTIES”) BE LIABLE, WHETHER IN CONTRACT, WARRANTY, TORT (INCLUDING NEGLIGENCE, WHETHER ACTIVE, PASSIVE OR IMPUTED), PRODUCT LIABILITY, STRICT LIABILITY OR OTHER THEORY, BREACH OF STATUTORY DUTY OR OTHERWISE ARISING OUT OF, OR IN CONNECTION WITH, YOUR USE OF PRYSM, FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES (INCLUDING ANY LOSS OF PROFITS OR DATA, BUSINESS INTERRUPTION OR OTHER PECUNIARY LOSS, OR DAMAGE, LOSS OR OTHER COMPROMISE OF DATA, IN EACH CASE WHETHER DIRECT, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL) ARISING OUT OF USE PRYSM, EVEN IF WE OR OTHER USERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. The foregoing limitations and disclaimers shall apply to the maximum extent permitted by Applicable Law, even if any remedy fails of its essential purpose. You acknowledge and agree that the limitations of liability afforded us hereunder constitute a material and actual inducement and condition to entering into these Terms, and are reasonable, fair and equitable in scope to protect our legitimate interests in light of the fact that we are not receiving consideration from you for providing Prysm.
+We reserve the right to revise these Terms, and your rights and obligations are at all times subject to the then-current Terms provided on Prysm. Your continued use of Prysm constitutes acceptance of such revised Terms.

-## Indemnification
-
-To the maximum extent permitted by Applicable Law, you will defend, indemnify and hold each OCL Party harmless from and against any and all claims, actions, suits, investigations, or proceedings by any third party (including any party or purported party to or beneficiary or purported beneficiary of any transaction or other activity on Prysm), as well as any and all losses, liabilities, damages, costs, and expenses (including reasonable attorneys’ fees and costs) arising out of, accruing from, or in any way related to (i) your breach of the terms of this Agreement, (ii) any transaction, or the failure to occur of any transaction on Prysm, and (iii) your negligence, fraud, or willful misconduct.
-
-## Compliance with Laws
-
-Your use of Prysm is subject to all applicable laws of any governmental authority, including, without limitation, federal, state and foreign securities laws, tax laws, tariff and trade laws, ordinances, judgments, decrees, injunctions, writs and orders or like actions of any governmental authority and rules, regulations, orders, interpretations, licenses, and permits of any federal, regional, state, county, municipal or other governmental authority (collectively, “Applicable Law”) and you agree to comply with all such Applicable Law in your use of Prysm. The users of Prysm are solely responsible to determinate what, if any, taxes apply to their ETH transactions. The owners of, or contributors to, Prysm are not responsible for determining the taxes that apply to ETH transactions.
-
-## Miscellaneous
-
-These Terms will be governed by the laws of the State of Delaware without regard to its conflict of law provisions. With respect to any disputes or claims not subject to arbitration, as set forth in the OCL Terms of Use, you and Offchain Labs submit to the personal and exclusive jurisdiction of the state and federal courts located within New York, New York and waive any objection to such jurisdiction and venue. The failure of Offchain Labs to exercise or enforce any right or provision of these Terms will not constitute a waiver of such right or provision.
-We reserve the right to revise these Terms, and your rights and obligations are at all times subject to the then-current Terms provided on Prysm. Your  use of Prysm following any such revision to these Terms constitutes acceptance of such revised Terms.
-
-These Terms constitute the entire agreement between you and Offchain Labs regarding use of Prysm and will supersede all prior agreements whether, written or oral. No usage of trade or other regular practice or method of dealing between the parties will be used to modify, interpret, supplement, or alter the terms of these Terms.
-
-If any portion of these Terms is held invalid or unenforceable, such invalidity or enforceability will not affect the other provisions of these Terms, which will remain in full force and effect, and the invalid or unenforceable portion will be given effect to the greatest extent possible. The failure of a party to require performance of any provision will not affect that party’s right to require performance at any time thereafter, nor will a waiver of any breach or default of these Terms or any provision of these Terms constitute a waiver of any subsequent breach or default or a waiver of the provision itself.
+These Terms constitute the entire agreement between you and Prysmatic Labs regarding use of Prysm and will supersede all prior agreements whether, written or oral. No usage of trade or other regular practice or method of dealing between the parties will be used to modify, interpret, supplement, or alter the terms of these Terms.

+If any portion of these Terms is held invalid or unenforceable, such invalidity or enforceability will not affect the other provisions of these Terms, which will remain in full force and effect, and the invalid or unenforceable portion will be given effect to the greatest extent possible. The failure of a party to require performance of any provision will not affect that party’s right to require performance at any time thereafter, nor will a waiver of any breach or default of these Terms or any provision of these Terms constitute a waiver of any subsequent breach or default or a waiver of the provision itself.
--- a/270
+++ b/270
@@ -17,55 +17,33 @@ load("@rules_pkg//:deps.bzl", "rules_pkg_dependencies")
 rules_pkg_dependencies()

 http_archive(
-    name = "hermetic_cc_toolchain",
-    sha256 = "973ab22945b921ef45b8e1d6ce01ca7ce1b8a462167449a36e297438c4ec2755",
-    strip_prefix = "hermetic_cc_toolchain-5098046bccc15d2962f3cc8e7e53d6a2a26072dc",
-    urls = [
-        "https://github.com/uber/hermetic_cc_toolchain/archive/5098046bccc15d2962f3cc8e7e53d6a2a26072dc.tar.gz",  # 2023-06-28
-    ],
+    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")

-# Temporarily use a nightly build until 0.12.0 is released.
-# See: https://github.com/prysmaticlabs/prysm/issues/13130
-zig_toolchains(
-    host_platform_sha256 = {
-        "linux-aarch64": "45afb8e32adde825165f4f293fcea9ecea503f7f9ec0e9bf4435afe70e67fb70",
-        "linux-x86_64": "f136c6a8a0f6adcb057d73615fbcd6f88281b3593f7008d5f7ed514ff925c02e",
-        "macos-aarch64": "05d995853c05243151deff47b60bdc2674f1e794a939eaeca0f42312da031cee",
-        "macos-x86_64": "721754ba5a50f31e8a1f0e1a74cace26f8246576878ac4a8591b0ee7b6db1fc1",
-        "windows-x86_64": "93f5248b2ea8c5ee8175e15b1384e133edc1cd49870b3ea259062a2e04164343",
-    },
-    url_formats = [
-        "https://ziglang.org/builds/zig-{host_platform}-{version}.{_ext}",
-        "https://mirror.bazel.build/ziglang.org/builds/zig-{host_platform}-{version}.{_ext}",
-        "https://prysmaticlabs.com/mirror/ziglang.org/builds/zig-{host_platform}-{version}.{_ext}",
-    ],
-    version = "0.12.0-dev.1349+fa022d1ec",
+bazel_toolchain_dependencies()
+
+load("@com_grail_bazel_toolchain//toolchain:rules.bzl", "llvm_toolchain")
+
+llvm_toolchain(
+    name = "llvm_toolchain",
+    llvm_version = "13.0.1",
 )

-# 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("@llvm_toolchain//:toolchains.bzl", "llvm_register_toolchains")

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

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

 configure_prysm_toolchains()

+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
 http_archive(
    name = "bazel_skylib",
    sha256 = "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
@@ -81,10 +59,10 @@ bazel_skylib_workspace()

 http_archive(
    name = "bazel_gazelle",
-    sha256 = "d3fa66a39028e97d76f9e2db8f1b0c11c099e8e01bf363a923074784e451f809",
+    sha256 = "5982e5463f171da99e3bdaeff8c0f48283a7a5f396ec5282910b9e8a49c0dd7e",
    urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.33.0/bazel-gazelle-v0.33.0.tar.gz",
-        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.33.0/bazel-gazelle-v0.33.0.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.25.0/bazel-gazelle-v0.25.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.25.0/bazel-gazelle-v0.25.0.tar.gz",
    ],
 )

@@ -96,38 +74,9 @@ http_archive(
 )

 http_archive(
-    name = "rules_distroless",
-    sha256 = "e64f06e452cd153aeab81f752ccf4642955b3af319e64f7bc7a7c9252f76b10e",
-    strip_prefix = "rules_distroless-f5e678217b57ce3ad2f1c0204bd4e9d416255773",
-    url = "https://github.com/GoogleContainerTools/rules_distroless/archive/f5e678217b57ce3ad2f1c0204bd4e9d416255773.tar.gz",
-)
-
-load("@rules_distroless//distroless:dependencies.bzl", "rules_distroless_dependencies")
-
-rules_distroless_dependencies()
-
-load("@aspect_bazel_lib//lib:repositories.bzl", "aspect_bazel_lib_dependencies", "aspect_bazel_lib_register_toolchains")
-
-aspect_bazel_lib_dependencies()
-
-aspect_bazel_lib_register_toolchains()
-
-http_archive(
-    name = "rules_oci",
-    sha256 = "c71c25ed333a4909d2dd77e0b16c39e9912525a98c7fa85144282be8d04ef54c",
-    strip_prefix = "rules_oci-1.3.4",
-    url = "https://github.com/bazel-contrib/rules_oci/releases/download/v1.3.4/rules_oci-v1.3.4.tar.gz",
-)
-
-load("@rules_oci//oci:dependencies.bzl", "rules_oci_dependencies")
-
-rules_oci_dependencies()
-
-load("@rules_oci//oci:repositories.bzl", "LATEST_CRANE_VERSION", "oci_register_toolchains")
-
-oci_register_toolchains(
-    name = "oci",
-    crane_version = LATEST_CRANE_VERSION,
+    name = "io_bazel_rules_docker",
+    sha256 = "b1e80761a8a8243d03ebca8845e9cc1ba6c82ce7c5179ce2b295cd36f7e394bf",
+    urls = ["https://github.com/bazelbuild/rules_docker/releases/download/v0.25.0/rules_docker-v0.25.0.tar.gz"],
 )

 http_archive(
@@ -137,10 +86,10 @@ http_archive(
        # Expose internals of go_test for custom build transitions.
        "//third_party:io_bazel_rules_go_test.patch",
    ],
-    sha256 = "d6ab6b57e48c09523e93050f13698f708428cfd5e619252e369d377af6597707",
+    sha256 = "6b65cb7917b4d1709f9410ffe00ecf3e160edf674b78c54a894471320862184f",
    urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.43.0/rules_go-v0.43.0.zip",
-        "https://github.com/bazelbuild/rules_go/releases/download/v0.43.0/rules_go-v0.43.0.zip",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.39.0/rules_go-v0.39.0.zip",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.39.0/rules_go-v0.39.0.zip",
    ],
 )

@@ -159,30 +108,63 @@ git_repository(
    # gazelle args: -go_prefix github.com/gogo/protobuf -proto legacy
 )

-load("@rules_oci//oci:pull.bzl", "oci_pull")
-
-# A multi-arch base image
-oci_pull(
-    name = "linux_debian11_multiarch_base",  # Debian bullseye
-    digest = "sha256:b82f113425c5b5c714151aaacd8039bc141821cdcd3c65202d42bdf9c43ae60b",  # 2023-12-12
-    image = "gcr.io/distroless/cc-debian11",
-    platforms = [
-        "linux/amd64",
-        "linux/arm64/v8",
-    ],
-    reproducible = True,
+load(
+    "@io_bazel_rules_docker//repositories:repositories.bzl",
+    container_repositories = "repositories",
 )

-load("@prysm//tools:image_deps.bzl", "prysm_image_deps")
+container_repositories()

-prysm_image_deps()
+load(
+    "@io_bazel_rules_docker//container:container.bzl",
+    "container_pull",
+)
+
+# Pulled gcr.io/distroless/cc-debian11:latest on 2022-02-23
+container_pull(
+    name = "cc_image_base_amd64",
+    digest = "sha256:2a0daf90a7deb78465bfca3ef2eee6e91ce0a5706059f05d79d799a51d339523",
+    registry = "gcr.io",
+    repository = "distroless/cc-debian11",
+)
+
+# Pulled gcr.io/distroless/cc-debian11:debug on 2022-02-23
+container_pull(
+    name = "cc_debug_image_base_amd64",
+    digest = "sha256:7bd596f5f200588f13a69c268eea6ce428b222b67cd7428d6a7fef95e75c052a",
+    registry = "gcr.io",
+    repository = "distroless/cc-debian11",
+)
+
+# Pulled from gcr.io/distroless/base-debian11:latest on 2022-02-23
+container_pull(
+    name = "go_image_base_amd64",
+    digest = "sha256:34e682800774ecbd0954b1663d90238505f1ba5543692dbc75feef7dd4839e90",
+    registry = "gcr.io",
+    repository = "distroless/base-debian11",
+)
+
+# Pulled from gcr.io/distroless/base-debian11:debug on 2022-02-23
+container_pull(
+    name = "go_debug_image_base_amd64",
+    digest = "sha256:0f503c6bfd207793bc416f20a35bf6b75d769a903c48f180ad73f60f7b60d7bd",
+    registry = "gcr.io",
+    repository = "distroless/base-debian11",
+)
+
+container_pull(
+    name = "alpine_cc_linux_amd64",
+    digest = "sha256:752aa0c9a88461ffc50c5267bb7497ef03a303e38b2c8f7f2ded9bebe5f1f00e",
+    registry = "index.docker.io",
+    repository = "pinglamb/alpine-glibc",
+)

 load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_dependencies")

 go_rules_dependencies()

 go_register_toolchains(
-    go_version = "1.21.6",
+    go_version = "1.20.3",
    nogo = "@//:nogo",
 )

@@ -204,8 +186,8 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "516d551cfb3e50e4ac2f42db0992f4ceb573a7cb1616d727a725c8161485329f",
-    url = "https://github.com/eth-clients/slashing-protection-interchange-tests/archive/refs/tags/v5.3.0.tar.gz",
+    sha256 = "91434d5fd5e1c6eb7b0174fed2afe25e09bddf00e1e4c431db931b2cee4e7773",
+    url = "https://github.com/eth-clients/slashing-protection-interchange-tests/archive/b8413ca42dc92308019d0d4db52c87e9e125c4e9.tar.gz",
 )

 http_archive(
@@ -223,7 +205,7 @@ filegroup(
    url = "https://github.com/ethereum/EIPs/archive/5480440fe51742ed23342b68cf106cefd427e39d.tar.gz",
 )

-consensus_spec_version = "v1.4.0-beta.5"
+consensus_spec_version = "v1.3.0"

 bls_test_version = "v0.1.1"

@@ -239,7 +221,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "9017ffff84d64a7c4c9e6ff9f421f9479f71d3b463b738f54e02158dbb4f50f0",
+    sha256 = "1c806e04ac5e3779032c06a6009350b3836b6809bb23812993d6ececd7047cf5",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/general.tar.gz" % consensus_spec_version,
 )

@@ -255,7 +237,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "f08711682553fe7c9362f1400ed8c56b2fa9576df08581fcad4c508ba8ad4788",
+    sha256 = "2b42796dc5ccd9f1246032d0c17663e20f70334ff7e00325f0fc3af28cb24186",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/minimal.tar.gz" % consensus_spec_version,
 )

@@ -271,7 +253,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "7ea3189e3879f2ac62467cbf2945c00b6c94d30cdefb2d645c630b1018c50e10",
+    sha256 = "231e3371e81ce9acde65d2910ec4580587e74dbbcfcbd9c675e473e022deec8a",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/mainnet.tar.gz" % consensus_spec_version,
 )

@@ -286,7 +268,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    sha256 = "4119992a2efc79e5cb2bdc07ed08c0b1fa32332cbd0d88e6467f34938df97026",
+    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,
 )
@@ -323,63 +305,39 @@ filegroup(
 )

 http_archive(
-    name = "goerli_testnet",
-    build_file_content = """
-filegroup(
-    name = "configs",
-    srcs = [
-        "prater/config.yaml",
-    ],
-    visibility = ["//visibility:public"],
-)
-    """,
-    sha256 = "43fc0f55ddff7b511713e2de07aa22846a67432df997296fb4fc09cd8ed1dcdb",
-    strip_prefix = "goerli-6522ac6684693740cd4ddcc2a0662e03702aa4a1",
-    url = "https://github.com/eth-clients/goerli/archive/6522ac6684693740cd4ddcc2a0662e03702aa4a1.tar.gz",
+    name = "com_github_bazelbuild_buildtools",
+    sha256 = "7a182df18df1debabd9e36ae07c8edfa1378b8424a04561b674d933b965372b3",
+    strip_prefix = "buildtools-f2aed9ee205d62d45c55cfabbfd26342f8526862",
+    url = "https://github.com/bazelbuild/buildtools/archive/f2aed9ee205d62d45c55cfabbfd26342f8526862.zip",
 )

+git_repository(
+    name = "com_google_protobuf",
+    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
+all_content = """filegroup(name = "all", srcs = glob(["**"]), visibility = ["//visibility:public"])"""
+
+# External dependencies
+
 http_archive(
-    name = "holesky_testnet",
+    name = "prysm_web_ui",
    build_file_content = """
 filegroup(
-    name = "configs",
-    srcs = [
-        "custom_config_data/config.yaml",
-    ],
+    name = "site",
+    srcs = glob(["**/*"]),
    visibility = ["//visibility:public"],
 )
 """,
-    sha256 = "5f4be6fd088683ea9db45c863b9c5a1884422449e5b59fd2d561d3ba0f73ffd9",
-    strip_prefix = "holesky-9d9aabf2d4de51334ee5fed6c79a4d55097d1a43",
-    url = "https://github.com/eth-clients/holesky/archive/9d9aabf2d4de51334ee5fed6c79a4d55097d1a43.tar.gz",  # 2024-01-22
-)
-
-http_archive(
-    name = "com_google_protobuf",
-    sha256 = "9bd87b8280ef720d3240514f884e56a712f2218f0d693b48050c836028940a42",
-    strip_prefix = "protobuf-25.1",
+    sha256 = "5006614c33e358699b4e072c649cd4c3866f7d41a691449d5156f6c6e07a4c60",
    urls = [
-        "https://github.com/protocolbuffers/protobuf/archive/v25.1.tar.gz",
+        "https://github.com/prysmaticlabs/prysm-web-ui/releases/download/v2.0.3/prysm-web-ui.tar.gz",
    ],
 )

-# External dependencies
-http_archive(
-    name = "googleapis",
-    sha256 = "9d1a930e767c93c825398b8f8692eca3fe353b9aaadedfbcf1fca2282c85df88",
-    strip_prefix = "googleapis-64926d52febbf298cb82a8f472ade4a3969ba922",
-    urls = [
-        "https://github.com/googleapis/googleapis/archive/64926d52febbf298cb82a8f472ade4a3969ba922.zip",
-    ],
-)
-
-load("@googleapis//:repository_rules.bzl", "switched_rules_by_language")
-
-switched_rules_by_language(
-    name = "com_google_googleapis_imports",
-    go = True,
-)
-
 load("//:deps.bzl", "prysm_deps")

 # gazelle:repository_macro deps.bzl%prysm_deps
@@ -393,6 +351,28 @@ load("@prysm//testing/endtoend:deps.bzl", "e2e_deps")

 e2e_deps()

+load(
+    "@io_bazel_rules_docker//go:image.bzl",
+    _go_image_repos = "repositories",
+)
+
+# Golang images
+# This is using gcr.io/distroless/base
+_go_image_repos()
+
+# CC images
+# This is using gcr.io/distroless/base
+load(
+    "@io_bazel_rules_docker//cc:image.bzl",
+    _cc_image_repos = "repositories",
+)
+
+_cc_image_repos()
+
+load("@io_bazel_rules_go//extras:embed_data_deps.bzl", "go_embed_data_dependencies")
+
+go_embed_data_dependencies()
+
 load("@com_github_atlassian_bazel_tools//gometalinter:deps.bzl", "gometalinter_dependencies")

 gometalinter_dependencies()
@@ -401,6 +381,10 @@ load("@bazel_gazelle//:deps.bzl", "gazelle_dependencies")

 gazelle_dependencies()

+load("@com_github_bazelbuild_buildtools//buildifier:deps.bzl", "buildifier_dependencies")
+
+buildifier_dependencies()
+
 load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")

 protobuf_deps()
--- a/api/BUILD.bazel
+++ b/api/BUILD.bazel
@@ -1,11 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library")
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "constants.go",
-        "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
@@ -6,17 +6,13 @@ 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",
-        "//api/server:go_default_library",
        "//beacon-chain/core/helpers:go_default_library",
-        "//beacon-chain/rpc/eth/beacon:go_default_library",
-        "//beacon-chain/rpc/eth/config:go_default_library",
-        "//beacon-chain/rpc/eth/shared:go_default_library",
-        "//beacon-chain/rpc/prysm/beacon:go_default_library",
+        "//beacon-chain/rpc/apimiddleware:go_default_library",
        "//beacon-chain/state:go_default_library",
        "//consensus-types/interfaces:go_default_library",
        "//consensus-types/primitives:go_default_library",
@@ -24,6 +20,7 @@ go_library(
        "//encoding/ssz/detect:go_default_library",
        "//io/file:go_default_library",
        "//network/forks:go_default_library",
+        "//proto/eth/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//runtime/version:go_default_library",
        "//time/slots:go_default_library",
@@ -42,7 +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
@@ -5,14 +5,11 @@ import (
 	"fmt"
 	"path"

-	"github.com/ethereum/go-ethereum/common/hexutil"
 	"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"
@@ -21,8 +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 {
@@ -79,40 +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", hexutil.Encode(sr[:])).
-		WithField("block_root", hexutil.Encode(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,
@@ -148,7 +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"
@@ -12,18 +14,16 @@ import (
 	"sort"
 	"strconv"
 	"text/template"
+	"time"
+
+	"github.com/prysmaticlabs/prysm/v4/network/forks"
+	v1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"

 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v4/api/client"
-	"github.com/prysmaticlabs/prysm/v4/api/server"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/beacon"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/config"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/shared"
-	apibeacon "github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/prysm/beacon"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/apimiddleware"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v4/network/forks"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	log "github.com/sirupsen/logrus"
 )
@@ -32,7 +32,7 @@ const (
 	getSignedBlockPath       = "/eth/v2/beacon/blocks"
 	getBlockRootPath         = "/eth/v1/beacon/blocks/{{.Id}}/root"
 	getForkForStatePath      = "/eth/v1/beacon/states/{{.Id}}/fork"
-	getWeakSubjectivityPath  = "/prysm/v1/beacon/weak_subjectivity"
+	getWeakSubjectivityPath  = "/eth/v1/beacon/weak_subjectivity"
 	getForkSchedulePath      = "/eth/v1/config/fork_schedule"
 	getConfigSpecPath        = "/eth/v1/config/spec"
 	getStatePath             = "/eth/v2/debug/beacon/states"
@@ -54,6 +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 {
@@ -83,22 +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.
@@ -108,7 +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)
 	}
@@ -123,7 +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)
 	}
@@ -146,23 +222,23 @@ 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)
 	}
-	fr := &shared.Fork{}
-	dataWrapper := &struct{ Data *shared.Fork }{Data: fr}
+	fr := &forkResponse{}
+	dataWrapper := &struct{ Data *forkResponse }{Data: fr}
 	err = json.Unmarshal(body, dataWrapper)
 	if err != nil {
 		return nil, errors.Wrap(err, "error decoding json response in GetFork")
 	}

-	return fr.ToConsensus()
+	return fr.Fork()
 }

 // 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")
 	}
@@ -179,12 +255,12 @@ 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) (*config.GetSpecResponse, error) {
-	body, err := c.Get(ctx, getConfigSpecPath)
+func (c *Client) GetConfigSpec(ctx context.Context) (*v1.SpecResponse, error) {
+	body, err := c.get(ctx, getConfigSpecPath)
 	if err != nil {
 		return nil, errors.Wrap(err, "error requesting configSpecPath")
 	}
-	fsr := &config.GetSpecResponse{}
+	fsr := &v1.SpecResponse{}
 	err = json.Unmarshal(body, fsr)
 	if err != nil {
 		return nil, err
@@ -203,7 +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],
@@ -215,7 +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")
 	}
@@ -242,7 +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)
 	}
@@ -255,20 +331,20 @@ 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
 	}
-	v := &apibeacon.GetWeakSubjectivityResponse{}
+	v := &apimiddleware.WeakSubjectivityResponse{}
 	err = json.Unmarshal(body, v)
 	if err != nil {
 		return nil, err
 	}
-	epoch, err := strconv.ParseUint(v.Data.WsCheckpoint.Epoch, 10, 64)
+	epoch, err := strconv.ParseUint(v.Data.Checkpoint.Epoch, 10, 64)
 	if err != nil {
 		return nil, err
 	}
-	blockRoot, err := hexutil.Decode(v.Data.WsCheckpoint.Root)
+	blockRoot, err := hexutil.Decode(v.Data.Checkpoint.Root)
 	if err != nil {
 		return nil, err
 	}
@@ -285,8 +361,8 @@ 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 []*shared.SignedBLSToExecutionChange) error {
-	u := c.BaseURL().ResolveReference(&url.URL{Path: changeBLStoExecutionPath})
+func (c *Client) SubmitChangeBLStoExecution(ctx context.Context, request []*apimiddleware.SignedBLSToExecutionChangeJson) error {
+	u := c.baseURL.ResolveReference(&url.URL{Path: changeBLStoExecutionPath})
 	body, err := json.Marshal(request)
 	if err != nil {
 		return errors.Wrap(err, "failed to marshal JSON")
@@ -296,7 +372,7 @@ func (c *Client) SubmitChangeBLStoExecution(ctx context.Context, request []*shar
 		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
 	}
@@ -306,7 +382,7 @@ func (c *Client) SubmitChangeBLStoExecution(ctx context.Context, request []*shar
 	if resp.StatusCode != http.StatusOK {
 		decoder := json.NewDecoder(resp.Body)
 		decoder.DisallowUnknownFields()
-		errorJson := &server.IndexedVerificationFailureError{}
+		errorJson := &apimiddleware.IndexedVerificationFailureErrorJson{}
 		if err := decoder.Decode(errorJson); err != nil {
 			return errors.Wrapf(err, "failed to decode error JSON for %s", resp.Request.URL)
 		}
@@ -324,12 +400,12 @@ func (c *Client) SubmitChangeBLStoExecution(ctx context.Context, request []*shar

 // 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) (*beacon.BLSToExecutionChangesPoolResponse, error) {
-	body, err := c.Get(ctx, changeBLStoExecutionPath)
+func (c *Client) GetBLStoExecutionChanges(ctx context.Context) (*apimiddleware.BLSToExecutionChangesPoolResponseJson, error) {
+	body, err := c.get(ctx, changeBLStoExecutionPath)
 	if err != nil {
 		return nil, err
 	}
-	poolResponse := &beacon.BLSToExecutionChangesPoolResponse{}
+	poolResponse := &apimiddleware.BLSToExecutionChangesPoolResponseJson{}
 	err = json.Unmarshal(body, poolResponse)
 	if err != nil {
 		return nil, err
@@ -337,8 +413,57 @@ func (c *Client) GetBLStoExecutionChanges(ctx context.Context) (*beacon.BLSToExe
 	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"`
+	Epoch           string `json:"epoch"`
+}
+
+func (f *forkResponse) Fork() (*ethpb.Fork, error) {
+	epoch, err := strconv.ParseUint(f.Epoch, 10, 64)
+	if err != nil {
+		return nil, err
+	}
+	cSlice, err := hexutil.Decode(f.CurrentVersion)
+	if err != nil {
+		return nil, err
+	}
+	if len(cSlice) != 4 {
+		return nil, fmt.Errorf("got %d byte version for CurrentVersion, expected 4 bytes. hex=%s", len(cSlice), f.CurrentVersion)
+	}
+	pSlice, err := hexutil.Decode(f.PreviousVersion)
+	if err != nil {
+		return nil, err
+	}
+	if len(pSlice) != 4 {
+		return nil, fmt.Errorf("got %d byte version, expected 4 bytes. version hex=%s", len(pSlice), f.PreviousVersion)
+	}
+	return &ethpb.Fork{
+		CurrentVersion:  cSlice,
+		PreviousVersion: pSlice,
+		Epoch:           primitives.Epoch(epoch),
+	}, nil
+}
+
 type forkScheduleResponse struct {
-	Data []shared.Fork
+	Data []forkResponse
 }

 func (fsr *forkScheduleResponse) OrderedForkSchedule() (forks.OrderedSchedule, error) {
--- 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/BUILD.bazel
+++ b/api/client/builder/BUILD.bazel
@@ -11,8 +11,6 @@ go_library(
    importpath = "github.com/prysmaticlabs/prysm/v4/api/client/builder",
    visibility = ["//visibility:public"],
    deps = [
-        "//beacon-chain/rpc/eth/shared:go_default_library",
-        "//config/fieldparams:go_default_library",
        "//consensus-types:go_default_library",
        "//consensus-types/blocks:go_default_library",
        "//consensus-types/interfaces:go_default_library",
@@ -20,6 +18,8 @@ go_library(
        "//encoding/bytesutil:go_default_library",
        "//math:go_default_library",
        "//monitoring/tracing:go_default_library",
+        "//network:go_default_library",
+        "//network/authorization:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//runtime/version:go_default_library",
@@ -40,19 +40,16 @@ go_test(
    data = glob(["testdata/**"]),
    embed = [":go_default_library"],
    deps = [
-        "//beacon-chain/rpc/eth/shared:go_default_library",
-        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/blocks:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
-        "//math:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
        "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
+        "@com_github_golang_protobuf//proto:go_default_library",
        "@com_github_prysmaticlabs_go_bitfield//:go_default_library",
-        "@com_github_sirupsen_logrus//:go_default_library",
    ],
 )
--- a/api/client/builder/bid.go
+++ b/api/client/builder/bid.go
@@ -1,11 +1,15 @@
 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"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
+	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	"github.com/prysmaticlabs/prysm/v4/math"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/runtime/version"
 )
@@ -21,7 +25,6 @@ type SignedBid interface {
 // Bid is an interface describing the method set of a builder bid.
 type Bid interface {
 	Header() (interfaces.ExecutionData, error)
-	BlobKzgCommitments() ([][]byte, error)
 	Value() []byte
 	Pubkey() []byte
 	Version() int
@@ -114,11 +117,6 @@ func (b builderBid) Header() (interfaces.ExecutionData, error) {
 	return blocks.WrappedExecutionPayloadHeader(b.p.Header)
 }

-// BlobKzgCommitments --
-func (b builderBid) BlobKzgCommitments() ([][]byte, error) {
-	return [][]byte{}, errors.New("blob kzg commitments not available before Deneb")
-}
-
 // Version --
 func (b builderBid) Version() int {
 	return version.Bellatrix
@@ -164,13 +162,12 @@ 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.
-	return blocks.WrappedExecutionPayloadHeaderCapella(b.p.Header, blocks.PayloadValueToWei(b.p.Value))
-}
-
-// BlobKzgCommitments --
-func (b builderBidCapella) BlobKzgCommitments() ([][]byte, error) {
-	return [][]byte{}, errors.New("blob kzg commitments not available before Deneb")
+	v := big.NewInt(0).SetBytes(bytesutil.ReverseByteOrder(b.p.Value))
+	return blocks.WrappedExecutionPayloadHeaderCapella(b.p.Header, math.WeiToGwei(v))
 }

 // Version --
@@ -202,90 +199,3 @@ func (b builderBidCapella) HashTreeRoot() ([32]byte, error) {
 func (b builderBidCapella) HashTreeRootWith(hh *ssz.Hasher) error {
 	return b.p.HashTreeRootWith(hh)
 }
-
-type builderBidDeneb struct {
-	p *ethpb.BuilderBidDeneb
-}
-
-// WrappedBuilderBidDeneb is a constructor which wraps a protobuf bid into an interface.
-func WrappedBuilderBidDeneb(p *ethpb.BuilderBidDeneb) (Bid, error) {
-	w := builderBidDeneb{p: p}
-	if w.IsNil() {
-		return nil, consensus_types.ErrNilObjectWrapped
-	}
-	return w, nil
-}
-
-// Version --
-func (b builderBidDeneb) Version() int {
-	return version.Deneb
-}
-
-// Value --
-func (b builderBidDeneb) Value() []byte {
-	return b.p.Value
-}
-
-// Pubkey --
-func (b builderBidDeneb) Pubkey() []byte {
-	return b.p.Pubkey
-}
-
-// IsNil --
-func (b builderBidDeneb) IsNil() bool {
-	return b.p == nil
-}
-
-// HashTreeRoot --
-func (b builderBidDeneb) HashTreeRoot() ([32]byte, error) {
-	return b.p.HashTreeRoot()
-}
-
-// HashTreeRootWith --
-func (b builderBidDeneb) HashTreeRootWith(hh *ssz.Hasher) error {
-	return b.p.HashTreeRootWith(hh)
-}
-
-// Header --
-func (b builderBidDeneb) Header() (interfaces.ExecutionData, error) {
-	// We have to convert big endian to little endian because the value is coming from the execution layer.
-	return blocks.WrappedExecutionPayloadHeaderDeneb(b.p.Header, blocks.PayloadValueToWei(b.p.Value))
-}
-
-// BlobKzgCommitments --
-func (b builderBidDeneb) BlobKzgCommitments() ([][]byte, error) {
-	return b.p.BlobKzgCommitments, nil
-}
-
-type signedBuilderBidDeneb struct {
-	p *ethpb.SignedBuilderBidDeneb
-}
-
-// WrappedSignedBuilderBidDeneb is a constructor which wraps a protobuf signed bit into an interface.
-func WrappedSignedBuilderBidDeneb(p *ethpb.SignedBuilderBidDeneb) (SignedBid, error) {
-	w := signedBuilderBidDeneb{p: p}
-	if w.IsNil() {
-		return nil, consensus_types.ErrNilObjectWrapped
-	}
-	return w, nil
-}
-
-// Message --
-func (b signedBuilderBidDeneb) Message() (Bid, error) {
-	return WrappedBuilderBidDeneb(b.p.Message)
-}
-
-// Signature --
-func (b signedBuilderBidDeneb) Signature() []byte {
-	return b.p.Signature
-}
-
-// Version --
-func (b signedBuilderBidDeneb) Version() int {
-	return version.Deneb
-}
-
-// IsNil --
-func (b signedBuilderBidDeneb) IsNil() bool {
-	return b.p == nil
-}
--- a/api/client/builder/client.go
+++ b/api/client/builder/client.go
@@ -6,21 +6,20 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
-	"math/big"
 	"net"
 	"net/http"
 	"net/url"
 	"strings"
 	"text/template"
+	"time"

 	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/shared"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
 	"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"
-	v1 "github.com/prysmaticlabs/prysm/v4/proto/engine/v1"
+	"github.com/prysmaticlabs/prysm/v4/network"
+	"github.com/prysmaticlabs/prysm/v4/network/authorization"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/runtime/version"
 	log "github.com/sirupsen/logrus"
@@ -37,6 +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)
@@ -88,7 +88,7 @@ type BuilderClient interface {
 	NodeURL() string
 	GetHeader(ctx context.Context, slot primitives.Slot, parentHash [32]byte, pubkey [48]byte) (SignedBid, error)
 	RegisterValidator(ctx context.Context, svr []*ethpb.SignedValidatorRegistrationV1) error
-	SubmitBlindedBlock(ctx context.Context, sb interfaces.ReadOnlySignedBeaconBlock) (interfaces.ExecutionData, *v1.BlobsBundle, error)
+	SubmitBlindedBlock(ctx context.Context, sb interfaces.ReadOnlySignedBeaconBlock) (interfaces.ExecutionData, error)
 	Status(ctx context.Context) error
 }

@@ -103,7 +103,8 @@ type Client struct {
 // `host` is the base host + port used to construct request urls. This value can be
 // a URL string, or NewClient will assume an http endpoint if just `host:port` is used.
 func NewClient(host string, opts ...ClientOpt) (*Client, error) {
-	u, err := urlForHost(host)
+	endpoint := covertEndPoint(host)
+	u, err := urlForHost(endpoint.Url)
 	if err != nil {
 		return nil, err
 	}
@@ -119,7 +120,8 @@ func NewClient(host string, opts ...ClientOpt) (*Client, error) {

 func urlForHost(h string) (*url.URL, error) {
 	// try to parse as url (being permissive)
-	if u, err := url.Parse(h); err == nil && u.Host != "" {
+	u, err := url.Parse(h)
+	if err == nil && u.Host != "" {
 		return u, nil
 	}
 	// try to parse as host:port
@@ -137,7 +139,7 @@ func (c *Client) NodeURL() string {

 type reqOption func(*http.Request)

-// do is a generic, opinionated request function to reduce boilerplate amongst the methods in this package api/client/builder.
+// do is a generic, opinionated request function to reduce boilerplate amongst the methods in this package api/client/builder/types.go.
 func (c *Client) do(ctx context.Context, method string, path string, body io.Reader, opts ...reqOption) (res []byte, err error) {
 	ctx, span := trace.StartSpan(ctx, "builder.client.do")
 	defer func() {
@@ -220,16 +222,6 @@ func (c *Client) GetHeader(ctx context.Context, slot primitives.Slot, parentHash
 		return nil, errors.Wrapf(err, "error unmarshaling the builder GetHeader response, using slot=%d, parentHash=%#x, pubkey=%#x", slot, parentHash, pubkey)
 	}
 	switch strings.ToLower(v.Version) {
-	case strings.ToLower(version.String(version.Deneb)):
-		hr := &ExecHeaderResponseDeneb{}
-		if err := json.Unmarshal(hb, hr); err != nil {
-			return nil, errors.Wrapf(err, "error unmarshaling the builder GetHeader response, using slot=%d, parentHash=%#x, pubkey=%#x", slot, parentHash, pubkey)
-		}
-		p, err := hr.ToProto()
-		if err != nil {
-			return nil, errors.Wrapf(err, "could not extract proto message from header")
-		}
-		return WrappedSignedBuilderBidDeneb(p)
 	case strings.ToLower(version.String(version.Capella)):
 		hr := &ExecHeaderResponseCapella{}
 		if err := json.Unmarshal(hb, hr); err != nil {
@@ -267,9 +259,9 @@ func (c *Client) RegisterValidator(ctx context.Context, svr []*ethpb.SignedValid
 		tracing.AnnotateError(span, err)
 		return err
 	}
-	vs := make([]*shared.SignedValidatorRegistration, len(svr))
+	vs := make([]*SignedValidatorRegistration, len(svr))
 	for i := 0; i < len(svr); i++ {
-		vs[i] = shared.SignedValidatorRegistrationFromConsensus(svr[i])
+		vs[i] = &SignedValidatorRegistration{SignedValidatorRegistrationV1: svr[i]}
 	}
 	body, err := json.Marshal(vs)
 	if err != nil {
@@ -284,124 +276,79 @@ func (c *Client) RegisterValidator(ctx context.Context, svr []*ethpb.SignedValid

 // SubmitBlindedBlock calls the builder API endpoint that binds the validator to the builder and submits the block.
 // The response is the full execution payload used to create the blinded block.
-func (c *Client) SubmitBlindedBlock(ctx context.Context, sb interfaces.ReadOnlySignedBeaconBlock) (interfaces.ExecutionData, *v1.BlobsBundle, error) {
+func (c *Client) SubmitBlindedBlock(ctx context.Context, sb interfaces.ReadOnlySignedBeaconBlock) (interfaces.ExecutionData, error) {
 	if !sb.IsBlinded() {
-		return nil, nil, errNotBlinded
+		return nil, errNotBlinded
 	}
 	switch sb.Version() {
 	case version.Bellatrix:
 		psb, err := sb.PbBlindedBellatrixBlock()
 		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not get protobuf block")
-		}
-		b, err := shared.SignedBlindedBeaconBlockBellatrixFromConsensus(&ethpb.SignedBlindedBeaconBlockBellatrix{Block: psb.Block, Signature: bytesutil.SafeCopyBytes(psb.Signature)})
-		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not convert SignedBlindedBeaconBlockBellatrix to json marshalable type")
+			return nil, errors.Wrapf(err, "could not get protobuf block")
 		}
+		b := &SignedBlindedBeaconBlockBellatrix{SignedBlindedBeaconBlockBellatrix: psb}
 		body, err := json.Marshal(b)
 		if err != nil {
-			return nil, nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockBellatrix value body in SubmitBlindedBlock")
+			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))
 		}
 		rb, err := c.do(ctx, http.MethodPost, postBlindedBeaconBlockPath, bytes.NewBuffer(body), versionOpt)

 		if err != nil {
-			return nil, nil, errors.Wrap(err, "error posting the SignedBlindedBeaconBlockBellatrix to the builder api")
+			return nil, errors.Wrap(err, "error posting the SignedBlindedBeaconBlockBellatrix to the builder api")
 		}
 		ep := &ExecPayloadResponse{}
 		if err := json.Unmarshal(rb, ep); err != nil {
-			return nil, nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlock response")
+			return nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlock response")
 		}
 		if strings.ToLower(ep.Version) != version.String(version.Bellatrix) {
-			return nil, nil, errors.New("not a bellatrix payload")
+			return nil, errors.New("not a bellatrix payload")
 		}
 		p, err := ep.ToProto()
 		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not extract proto message from payload")
+			return nil, errors.Wrapf(err, "could not extract proto message from payload")
 		}
-		payload, err := blocks.WrappedExecutionPayload(p)
-		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not wrap execution payload in interface")
-		}
-		return payload, nil, nil
+		return blocks.WrappedExecutionPayload(p)
 	case version.Capella:
 		psb, err := sb.PbBlindedCapellaBlock()
 		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not get protobuf block")
-		}
-		b, err := shared.SignedBlindedBeaconBlockCapellaFromConsensus(&ethpb.SignedBlindedBeaconBlockCapella{Block: psb.Block, Signature: bytesutil.SafeCopyBytes(psb.Signature)})
-		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not convert SignedBlindedBeaconBlockCapella to json marshalable type")
+			return nil, errors.Wrapf(err, "could not get protobuf block")
 		}
+		b := &SignedBlindedBeaconBlockCapella{SignedBlindedBeaconBlockCapella: psb}
 		body, err := json.Marshal(b)
 		if err != nil {
-			return nil, nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockCapella value body in SubmitBlindedBlockCapella")
+			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))
 		}
 		rb, err := c.do(ctx, http.MethodPost, postBlindedBeaconBlockPath, bytes.NewBuffer(body), versionOpt)

 		if err != nil {
-			return nil, nil, errors.Wrap(err, "error posting the SignedBlindedBeaconBlockCapella to the builder api")
+			return nil, errors.Wrap(err, "error posting the SignedBlindedBeaconBlockCapella to the builder api")
 		}
 		ep := &ExecPayloadResponseCapella{}
 		if err := json.Unmarshal(rb, ep); err != nil {
-			return nil, nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlockCapella response")
+			return nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlockCapella response")
 		}
 		if strings.ToLower(ep.Version) != version.String(version.Capella) {
-			return nil, nil, errors.New("not a capella payload")
+			return nil, errors.New("not a capella payload")
 		}
 		p, err := ep.ToProto()
 		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not extract proto message from payload")
+			return nil, errors.Wrapf(err, "could not extract proto message from payload")
 		}
-		payload, err := blocks.WrappedExecutionPayloadCapella(p, big.NewInt(0))
-		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not wrap execution payload in interface")
-		}
-		return payload, nil, nil
-	case version.Deneb:
-		psb, err := sb.PbBlindedDenebBlock()
-		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not get protobuf block")
-		}
-		b, err := shared.SignedBlindedBeaconBlockDenebFromConsensus(&ethpb.SignedBlindedBeaconBlockDeneb{Message: psb.Message, Signature: bytesutil.SafeCopyBytes(psb.Signature)})
-		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not convert SignedBlindedBeaconBlockDeneb to json marshalable type")
-		}
-		body, err := json.Marshal(b)
-		if err != nil {
-			return nil, nil, errors.Wrap(err, "error encoding the SignedBlindedBeaconBlockDeneb value body in SubmitBlindedBlockDeneb")
-		}
-
-		versionOpt := func(r *http.Request) {
-			r.Header.Add("Eth-Consensus-Version", version.String(version.Deneb))
-		}
-		rb, err := c.do(ctx, http.MethodPost, postBlindedBeaconBlockPath, bytes.NewBuffer(body), versionOpt)
-		if err != nil {
-			return nil, nil, errors.Wrap(err, "error posting the SignedBlindedBeaconBlockDeneb to the builder api")
-		}
-		ep := &ExecPayloadResponseDeneb{}
-		if err := json.Unmarshal(rb, ep); err != nil {
-			return nil, nil, errors.Wrap(err, "error unmarshaling the builder SubmitBlindedBlockDeneb response")
-		}
-		if strings.ToLower(ep.Version) != version.String(version.Deneb) {
-			return nil, nil, errors.New("not a deneb payload")
-		}
-		p, blobBundle, err := ep.ToProto()
-		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not extract proto message from payload")
-		}
-		payload, err := blocks.WrappedExecutionPayloadDeneb(p, big.NewInt(0))
-		if err != nil {
-			return nil, nil, errors.Wrapf(err, "could not wrap execution payload in interface")
-		}
-		return payload, blobBundle, nil
+		return blocks.WrappedExecutionPayloadCapella(p, 0)
 	default:
-		return nil, nil, fmt.Errorf("unsupported block version %s", version.String(sb.Version()))
+		return nil, fmt.Errorf("unsupported block version %s", version.String(sb.Version()))
 	}
 }

@@ -424,29 +371,38 @@ func non200Err(response *http.Response) error {
 	}
 	msg := fmt.Sprintf("code=%d, url=%s, body=%s", response.StatusCode, response.Request.URL, body)
 	switch response.StatusCode {
-	case http.StatusNoContent:
+	case 204:
 		log.WithError(ErrNoContent).Debug(msg)
 		return ErrNoContent
-	case http.StatusBadRequest:
+	case 400:
+		if jsonErr := json.Unmarshal(bodyBytes, &errMessage); jsonErr != nil {
+			return errors.Wrap(jsonErr, "unable to read response body")
+		}
 		log.WithError(ErrBadRequest).Debug(msg)
-		if jsonErr := json.Unmarshal(bodyBytes, &errMessage); jsonErr != nil {
-			return errors.Wrap(jsonErr, "unable to read response body")
-		}
 		return errors.Wrap(ErrBadRequest, errMessage.Message)
-	case http.StatusNotFound:
+	case 404:
+		if jsonErr := json.Unmarshal(bodyBytes, &errMessage); jsonErr != nil {
+			return errors.Wrap(jsonErr, "unable to read response body")
+		}
 		log.WithError(ErrNotFound).Debug(msg)
-		if jsonErr := json.Unmarshal(bodyBytes, &errMessage); jsonErr != nil {
-			return errors.Wrap(jsonErr, "unable to read response body")
-		}
 		return errors.Wrap(ErrNotFound, errMessage.Message)
-	case http.StatusInternalServerError:
-		log.WithError(ErrNotOK).Debug(msg)
+	case 500:
 		if jsonErr := json.Unmarshal(bodyBytes, &errMessage); jsonErr != nil {
 			return errors.Wrap(jsonErr, "unable to read response body")
 		}
+		log.WithError(ErrNotOK).Debug(msg)
 		return errors.Wrap(ErrNotOK, errMessage.Message)
 	default:
 		log.WithError(ErrNotOK).Debug(msg)
 		return errors.Wrap(ErrNotOK, fmt.Sprintf("unsupported error code: %d", response.StatusCode))
 	}
 }
+
+func covertEndPoint(ep string) network.Endpoint {
+	return network.Endpoint{
+		Url: ep,
+		Auth: network.AuthorizationData{ // Auth is not used for builder.
+			Method: authorization.None,
+			Value:  "",
+		}}
+}
--- a/api/client/builder/client_test.go
+++ b/api/client/builder/client_test.go
@@ -13,7 +13,6 @@ import (
 	"testing"

 	"github.com/prysmaticlabs/go-bitfield"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/shared"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
 	types "github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
@@ -22,7 +21,6 @@ import (
 	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/testing/assert"
 	"github.com/prysmaticlabs/prysm/v4/testing/require"
-	log "github.com/sirupsen/logrus"
 )

 type roundtrip func(*http.Request) (*http.Response, error)
@@ -127,6 +125,7 @@ func TestClient_GetHeader(t *testing.T) {
 	var slot types.Slot = 23
 	parentHash := ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
 	pubkey := ezDecode(t, "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a")
+
 	t.Run("server error", func(t *testing.T) {
 		hc := &http.Client{
 			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
@@ -237,62 +236,6 @@ func TestClient_GetHeader(t *testing.T) {
 		require.DeepEqual(t, bidValue, value.Bytes())
 		require.DeepEqual(t, big.NewInt(0).SetBytes(bidValue), value.Int)
 	})
-	t.Run("deneb", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, expectedPath, r.URL.Path)
-				return &http.Response{
-					StatusCode: http.StatusOK,
-					Body:       io.NopCloser(bytes.NewBufferString(testExampleHeaderResponseDeneb)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-		h, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
-		require.NoError(t, err)
-		expectedWithdrawalsRoot := ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-		bid, err := h.Message()
-		require.NoError(t, err)
-		bidHeader, err := bid.Header()
-		require.NoError(t, err)
-		withdrawalsRoot, err := bidHeader.WithdrawalsRoot()
-		require.NoError(t, err)
-		require.Equal(t, true, bytes.Equal(expectedWithdrawalsRoot, withdrawalsRoot))
-		value, err := stringToUint256("652312848583266388373324160190187140051835877600158453279131187530910662656")
-		require.NoError(t, err)
-		require.Equal(t, fmt.Sprintf("%#x", value.SSZBytes()), fmt.Sprintf("%#x", bid.Value()))
-		bidValue := bytesutil.ReverseByteOrder(bid.Value())
-		require.DeepEqual(t, bidValue, value.Bytes())
-		require.DeepEqual(t, big.NewInt(0).SetBytes(bidValue), value.Int)
-		kcgCommitments, err := bid.BlobKzgCommitments()
-		require.NoError(t, err)
-		require.Equal(t, len(kcgCommitments) > 0, true)
-		for i := range kcgCommitments {
-			require.Equal(t, len(kcgCommitments[i]) == 48, true)
-		}
-	})
-	t.Run("deneb, too many kzg commitments", func(t *testing.T) {
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, expectedPath, r.URL.Path)
-				return &http.Response{
-					StatusCode: http.StatusOK,
-					Body:       io.NopCloser(bytes.NewBufferString(testExampleHeaderResponseDenebTooManyBlobs)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-		_, err := c.GetHeader(ctx, slot, bytesutil.ToBytes32(parentHash), bytesutil.ToBytes48(pubkey))
-		require.ErrorContains(t, "could not extract proto message from header: too many blob commitments: 7", err)
-	})
 	t.Run("unsupported version", func(t *testing.T) {
 		hc := &http.Client{
 			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
@@ -334,7 +277,7 @@ func TestSubmitBlindedBlock(t *testing.T) {
 		}
 		sbbb, err := blocks.NewSignedBeaconBlock(testSignedBlindedBeaconBlockBellatrix(t))
 		require.NoError(t, err)
-		ep, _, err := c.SubmitBlindedBlock(ctx, sbbb)
+		ep, err := c.SubmitBlindedBlock(ctx, sbbb)
 		require.NoError(t, err)
 		require.Equal(t, true, bytes.Equal(ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"), ep.ParentHash()))
 		bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
@@ -360,7 +303,7 @@ func TestSubmitBlindedBlock(t *testing.T) {
 		}
 		sbb, err := blocks.NewSignedBeaconBlock(testSignedBlindedBeaconBlockCapella(t))
 		require.NoError(t, err)
-		ep, _, err := c.SubmitBlindedBlock(ctx, sbb)
+		ep, err := c.SubmitBlindedBlock(ctx, sbb)
 		require.NoError(t, err)
 		withdrawals, err := ep.Withdrawals()
 		require.NoError(t, err)
@@ -370,44 +313,6 @@ func TestSubmitBlindedBlock(t *testing.T) {
 		assert.DeepEqual(t, ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943"), withdrawals[0].Address)
 		assert.Equal(t, uint64(1), withdrawals[0].Amount)
 	})
-	t.Run("deneb", func(t *testing.T) {
-		test := testSignedBlindedBeaconBlockDeneb(t)
-		hc := &http.Client{
-			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
-				require.Equal(t, postBlindedBeaconBlockPath, r.URL.Path)
-				require.Equal(t, "deneb", r.Header.Get("Eth-Consensus-Version"))
-				var req shared.SignedBlindedBeaconBlockDeneb
-				err := json.NewDecoder(r.Body).Decode(&req)
-				require.NoError(t, err)
-				block, err := req.ToConsensus()
-				require.NoError(t, err)
-				require.DeepEqual(t, block, test)
-				return &http.Response{
-					StatusCode: http.StatusOK,
-					Body:       io.NopCloser(bytes.NewBufferString(testExampleExecutionPayloadDeneb)),
-					Request:    r.Clone(ctx),
-				}, nil
-			}),
-		}
-		c := &Client{
-			hc:      hc,
-			baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
-		}
-
-		sbb, err := blocks.NewSignedBeaconBlock(test)
-		require.NoError(t, err)
-
-		ep, blobBundle, err := c.SubmitBlindedBlock(ctx, sbb)
-		require.NoError(t, err)
-		withdrawals, err := ep.Withdrawals()
-		require.NoError(t, err)
-		require.Equal(t, 1, len(withdrawals))
-		assert.Equal(t, uint64(1), withdrawals[0].Index)
-		assert.Equal(t, types.ValidatorIndex(1), withdrawals[0].ValidatorIndex)
-		assert.DeepEqual(t, ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943"), withdrawals[0].Address)
-		assert.Equal(t, uint64(1), withdrawals[0].Amount)
-		require.NotNil(t, blobBundle)
-	})
 	t.Run("mismatched versions, expected bellatrix got capella", func(t *testing.T) {
 		hc := &http.Client{
 			Transport: roundtrip(func(r *http.Request) (*http.Response, error) {
@@ -425,13 +330,13 @@ func TestSubmitBlindedBlock(t *testing.T) {
 		}
 		sbbb, err := blocks.NewSignedBeaconBlock(testSignedBlindedBeaconBlockBellatrix(t))
 		require.NoError(t, err)
-		_, _, err = c.SubmitBlindedBlock(ctx, sbbb)
+		_, err = c.SubmitBlindedBlock(ctx, sbbb)
 		require.ErrorContains(t, "not a bellatrix payload", err)
 	})
 	t.Run("not blinded", func(t *testing.T) {
-		sbb, err := blocks.NewSignedBeaconBlock(&eth.SignedBeaconBlockBellatrix{Block: &eth.BeaconBlockBellatrix{Body: &eth.BeaconBlockBodyBellatrix{ExecutionPayload: &v1.ExecutionPayload{}}}})
+		sbb, err := blocks.NewSignedBeaconBlock(&eth.SignedBeaconBlockBellatrix{Block: &eth.BeaconBlockBellatrix{Body: &eth.BeaconBlockBodyBellatrix{}}})
 		require.NoError(t, err)
-		_, _, err = (&Client{}).SubmitBlindedBlock(ctx, sbb)
+		_, err = (&Client{}).SubmitBlindedBlock(ctx, sbb)
 		require.ErrorIs(t, err, errNotBlinded)
 	})
 }
@@ -721,155 +626,6 @@ func testSignedBlindedBeaconBlockCapella(t *testing.T) *eth.SignedBlindedBeaconB
 	}
 }

-func testSignedBlindedBeaconBlockDeneb(t *testing.T) *eth.SignedBlindedBeaconBlockDeneb {
-	basebytes, err := bytesutil.Uint256ToSSZBytes("14074904626401341155369551180448584754667373453244490859944217516317499064576")
-	if err != nil {
-		log.Error(err)
-	}
-	return &eth.SignedBlindedBeaconBlockDeneb{
-		Message: &eth.BlindedBeaconBlockDeneb{
-			Slot:          1,
-			ProposerIndex: 1,
-			ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-			StateRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-			Body: &eth.BlindedBeaconBlockBodyDeneb{
-				RandaoReveal: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-				Eth1Data: &eth.Eth1Data{
-					DepositRoot:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					DepositCount: 1,
-					BlockHash:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-				},
-				Graffiti: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-				ProposerSlashings: []*eth.ProposerSlashing{
-					{
-						Header_1: &eth.SignedBeaconBlockHeader{
-							Header: &eth.BeaconBlockHeader{
-								Slot:          1,
-								ProposerIndex: 1,
-								ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								StateRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								BodyRoot:      ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							},
-							Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-						Header_2: &eth.SignedBeaconBlockHeader{
-							Header: &eth.BeaconBlockHeader{
-								Slot:          1,
-								ProposerIndex: 1,
-								ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								StateRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								BodyRoot:      ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							},
-							Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-					},
-				},
-				AttesterSlashings: []*eth.AttesterSlashing{
-					{
-						Attestation_1: &eth.IndexedAttestation{
-							AttestingIndices: []uint64{1},
-							Data: &eth.AttestationData{
-								Slot:            1,
-								CommitteeIndex:  1,
-								BeaconBlockRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								Source: &eth.Checkpoint{
-									Epoch: 1,
-									Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								},
-								Target: &eth.Checkpoint{
-									Epoch: 1,
-									Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								},
-							},
-							Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-						Attestation_2: &eth.IndexedAttestation{
-							AttestingIndices: []uint64{1},
-							Data: &eth.AttestationData{
-								Slot:            1,
-								CommitteeIndex:  1,
-								BeaconBlockRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								Source: &eth.Checkpoint{
-									Epoch: 1,
-									Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								},
-								Target: &eth.Checkpoint{
-									Epoch: 1,
-									Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-								},
-							},
-							Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-					},
-				},
-				Attestations: []*eth.Attestation{
-					{
-						AggregationBits: bitfield.Bitlist{0x01},
-						Data: &eth.AttestationData{
-							Slot:            1,
-							CommitteeIndex:  1,
-							BeaconBlockRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							Source: &eth.Checkpoint{
-								Epoch: 1,
-								Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							},
-							Target: &eth.Checkpoint{
-								Epoch: 1,
-								Root:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							},
-						},
-						Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-					},
-				},
-				Deposits: []*eth.Deposit{
-					{
-						Proof: [][]byte{ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")},
-						Data: &eth.Deposit_Data{
-							PublicKey:             ezDecode(t, "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"),
-							WithdrawalCredentials: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-							Amount:                1,
-							Signature:             ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-						},
-					},
-				},
-				VoluntaryExits: []*eth.SignedVoluntaryExit{
-					{
-						Exit: &eth.VoluntaryExit{
-							Epoch:          1,
-							ValidatorIndex: 1,
-						},
-						Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-					},
-				},
-				SyncAggregate: &eth.SyncAggregate{
-					SyncCommitteeSignature: make([]byte, 96),
-					SyncCommitteeBits:      ezDecode(t, "0x6451e9f951ebf05edc01de67e593484b672877054f055903ff0df1a1a945cf30ca26bb4d4b154f94a1bc776bcf5d0efb3603e1f9b8ee2499ccdcfe2a18cef458"),
-				},
-				ExecutionPayloadHeader: &v1.ExecutionPayloadHeaderDeneb{
-					ParentHash:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					FeeRecipient:     ezDecode(t, "0xabcf8e0d4e9587369b2301d0790347320302cc09"),
-					StateRoot:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					ReceiptsRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					LogsBloom:        ezDecode(t, "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
-					PrevRandao:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					BlockNumber:      1,
-					GasLimit:         1,
-					GasUsed:          1,
-					Timestamp:        1,
-					ExtraData:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					BaseFeePerGas:    basebytes,
-					BlockHash:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					TransactionsRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					WithdrawalsRoot:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-					BlobGasUsed:      1,
-					ExcessBlobGas:    2,
-				},
-			},
-		},
-		Signature: ezDecode(t, "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"),
-	}
-}
-
 func TestRequestLogger(t *testing.T) {
 	wo := WithObserver(&requestLogger{})
 	c, err := NewClient("localhost:3500", wo)
--- a/api/client/builder/testdata/blinded-block-capella.json
+++ b/api/client/builder/testdata/blinded-block-capella.json
--- a/api/client/builder/testing/BUILD.bazel
+++ b/api/client/builder/testing/BUILD.bazel
@@ -10,7 +10,6 @@ go_library(
        "//consensus-types/interfaces:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
-        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
    ],
 )
--- a/api/client/builder/testing/mock.go
+++ b/api/client/builder/testing/mock.go
@@ -7,7 +7,6 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
-	v1 "github.com/prysmaticlabs/prysm/v4/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 )

@@ -41,8 +40,8 @@ func (m MockClient) RegisterValidator(_ context.Context, svr []*ethpb.SignedVali
 }

 // SubmitBlindedBlock --
-func (MockClient) SubmitBlindedBlock(_ context.Context, _ interfaces.ReadOnlySignedBeaconBlock) (interfaces.ExecutionData, *v1.BlobsBundle, error) {
-	return nil, nil, nil
+func (MockClient) SubmitBlindedBlock(_ context.Context, _ interfaces.ReadOnlySignedBeaconBlock) (interfaces.ExecutionData, error) {
+	return nil, nil
 }

 // Status --
--- a/api/client/builder/types.go
+++ b/api/client/builder/types.go
--- a/api/client/builder/types_test.go
+++ b/api/client/builder/types_test.go
@@ -12,10 +12,8 @@ import (
 	"testing"

 	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/golang/protobuf/proto"
 	"github.com/prysmaticlabs/go-bitfield"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/rpc/eth/shared"
-	fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
-	"github.com/prysmaticlabs/prysm/v4/math"
 	v1 "github.com/prysmaticlabs/prysm/v4/proto/engine/v1"
 	eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/testing/assert"
@@ -38,7 +36,7 @@ func TestSignedValidatorRegistration_MarshalJSON(t *testing.T) {
 		},
 		Signature: make([]byte, 96),
 	}
-	a := shared.SignedValidatorRegistrationFromConsensus(svr)
+	a := &SignedValidatorRegistration{SignedValidatorRegistrationV1: svr}
 	je, err := json.Marshal(a)
 	require.NoError(t, err)
 	// decode with a struct w/ plain strings so we can check the string encoding of the hex fields
@@ -55,11 +53,11 @@ func TestSignedValidatorRegistration_MarshalJSON(t *testing.T) {
 	require.Equal(t, "0x000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", un.Message.Pubkey)

 	t.Run("roundtrip", func(t *testing.T) {
-		b := &shared.SignedValidatorRegistration{}
+		b := &SignedValidatorRegistration{}
 		if err := json.Unmarshal(je, b); err != nil {
 			require.NoError(t, err)
 		}
-		require.DeepEqual(t, a, b)
+		require.Equal(t, proto.Equal(a.SignedValidatorRegistrationV1, b.SignedValidatorRegistrationV1), true)
 	})
 }

@@ -118,69 +116,6 @@ var testExampleHeaderResponseCapella = `{
  }
 }`

-var testExampleHeaderResponseDeneb = `{
-  "version": "deneb",
-  "data": {
-    "message": {
-      "header": {
-        "parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-        "state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-        "prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "block_number": "1",
-        "gas_limit": "1",
-        "gas_used": "1",
-        "timestamp": "1",
-        "extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-		"block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "transactions_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "withdrawals_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"blob_gas_used": "1",	
-		"excess_blob_gas": "2"	
-      },
-      "blob_kzg_commitments": [
-          "0x8dab030c51e16e84be9caab84ee3d0b8bbec1db4a0e4de76439da8424d9b957370a10a78851f97e4b54d2ce1ab0d686f"
-	  ],
-      "value": "652312848583266388373324160190187140051835877600158453279131187530910662656",
-      "pubkey": "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"
-    },
-    "signature": "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"
-  }
-}`
-
-var testExampleHeaderResponseDenebNoBundle = `{
-  "version": "deneb",
-  "data": {
-    "message": {
-      "header": {
-        "parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-        "state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-        "prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "block_number": "1",
-        "gas_limit": "1",
-        "gas_used": "1",
-        "timestamp": "1",
-        "extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-		"block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "transactions_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "withdrawals_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"blob_gas_used": "1",	
-		"excess_blob_gas": "2"	
-      },
-      "value": "652312848583266388373324160190187140051835877600158453279131187530910662656",
-      "pubkey": "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"
-    },
-    "signature": "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"
-  }
-}`
-
 var testExampleHeaderResponseUnknownVersion = `{
  "version": "bad",
  "data": {
@@ -209,39 +144,6 @@ var testExampleHeaderResponseUnknownVersion = `{
  }
 }`

-var testExampleHeaderResponseDenebTooManyBlobs = `{
-  "version": "deneb",
-  "data": {
-    "message": {
-      "header": {
-        "parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-        "state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-        "prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "block_number": "1",
-        "gas_limit": "1",
-        "gas_used": "1",
-        "timestamp": "1",
-        "extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-		"block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "transactions_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-        "withdrawals_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"blob_gas_used": "1",	
-		"excess_blob_gas": "2"	
-      },
-      "blob_kzg_commitments": [
-          "","","","","","",""
-	  ],
-      "value": "652312848583266388373324160190187140051835877600158453279131187530910662656",
-      "pubkey": "0x93247f2209abcacf57b75a51dafae777f9dd38bc7053d1af526f220a7489a6d3a2753e5f3e8b1cfe39b56f43611df74a"
-    },
-    "signature": "0x1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505cc411d61252fb6cb3fa0017b679f8bb2305b26a285fa2737f175668d0dff91cc1b66ac1fb663c9bc59509846d6ec05345bd908eda73e670af888da41af171505"
-  }
-}`
-
 func TestExecutionHeaderResponseUnmarshal(t *testing.T) {
 	hr := &ExecHeaderResponse{}
 	require.NoError(t, json.Unmarshal([]byte(testExampleHeaderResponse), hr))
@@ -616,196 +518,6 @@ var testExampleExecutionPayloadCapella = `{
  }
 }`

-var testExampleExecutionPayloadDeneb = fmt.Sprintf(`{
-  "version": "deneb",
-  "data": {
-	"execution_payload":{
-		"parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-		"state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-		"prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"block_number": "1",
-		"gas_limit": "1",
-		"gas_used": "1",
-		"timestamp": "1",
-		"extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-		"block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"transactions": [
-		  "0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86"
-		],
-		"withdrawals": [
-		  {
-			"index": "1",
-			"validator_index": "1",
-			"address": "0xcf8e0d4e9587369b2301d0790347320302cc0943",
-			"amount": "1"
-		  }
-		],
-		"blob_gas_used": "2",
- 		"excess_blob_gas": "3"
-	  },
-	"blobs_bundle": {
-      "commitments": [
-        "0x8dab030c51e16e84be9caab84ee3d0b8bbec1db4a0e4de76439da8424d9b957370a10a78851f97e4b54d2ce1ab0d686f"
-      ],
-      "proofs": [
-        "0xb4021b0de10f743893d4f71e1bf830c019e832958efd6795baf2f83b8699a9eccc5dc99015d8d4d8ec370d0cc333c06a"
-      ],
-      "blobs": [
-        "%s"
-      ]
-    }
-  }
-}`, hexutil.Encode(make([]byte, fieldparams.BlobLength)))
-
-var testExampleExecutionPayloadDenebTooManyBlobs = fmt.Sprintf(`{
-  "version": "deneb",
-  "data": {
-	"execution_payload":{
-		"parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-		"state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-		"prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"block_number": "1",
-		"gas_limit": "1",
-		"gas_used": "1",
-		"timestamp": "1",
-		"extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-		"block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"transactions": [
-		  "0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86"
-		],
-		"withdrawals": [
-		  {
-			"index": "1",
-			"validator_index": "1",
-			"address": "0xcf8e0d4e9587369b2301d0790347320302cc0943",
-			"amount": "1"
-		  }
-		],
-		"blob_gas_used": "2",
- 		"excess_blob_gas": "3"
-	  },
-	"blobs_bundle": {
-      "commitments": [
-        "0x8dab030c51e16e84be9caab84ee3d0b8bbec1db4a0e4de76439da8424d9b957370a10a78851f97e4b54d2ce1ab0d686f"
-      ],
-      "proofs": [
-        "0xb4021b0de10f743893d4f71e1bf830c019e832958efd6795baf2f83b8699a9eccc5dc99015d8d4d8ec370d0cc333c06a"
-      ],
-      "blobs": %s
-    }
-  }
-}`, beyondMaxEmptyBlobs())
-
-func beyondMaxEmptyBlobs() string {
-	moreThanMax := fieldparams.MaxBlobCommitmentsPerBlock + 2
-	blobs := make([]string, moreThanMax)
-	b, err := json.Marshal(blobs)
-	if err != nil {
-		panic(err)
-	}
-	return string(b)
-}
-
-var testExampleExecutionPayloadDenebDifferentCommitmentCount = fmt.Sprintf(`{
-  "version": "deneb",
-  "data": {
-	"execution_payload":{
-		"parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-		"state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-		"prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"block_number": "1",
-		"gas_limit": "1",
-		"gas_used": "1",
-		"timestamp": "1",
-		"extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-		"block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"transactions": [
-		  "0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86"
-		],
-		"withdrawals": [
-		  {
-			"index": "1",
-			"validator_index": "1",
-			"address": "0xcf8e0d4e9587369b2301d0790347320302cc0943",
-			"amount": "1"
-		  }
-		],
-		"blob_gas_used": "2",
- 		"excess_blob_gas": "3"
-	  },
-	"blobs_bundle": {
-      "commitments": [
-        "0x8dab030c51e16e84be9caab84ee3d0b8bbec1db4a0e4de76439da8424d9b957370a10a78851f97e4b54d2ce1ab0d686f",
-        "0xc00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
-      ],
-      "proofs": [
-        "0xb4021b0de10f743893d4f71e1bf830c019e832958efd6795baf2f83b8699a9eccc5dc99015d8d4d8ec370d0cc333c06a"
-      ],
-      "blobs": [
-        "%s"
-      ]
-    }
-  }
-}`, hexutil.Encode(make([]byte, fieldparams.BlobLength)))
-
-var testExampleExecutionPayloadDenebDifferentProofCount = fmt.Sprintf(`{
-  "version": "deneb",
-  "data": {
-	"execution_payload":{
-		"parent_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"fee_recipient": "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-		"state_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"receipts_root": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"logs_bloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-		"prev_randao": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"block_number": "1",
-		"gas_limit": "1",
-		"gas_used": "1",
-		"timestamp": "1",
-		"extra_data": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"base_fee_per_gas": "452312848583266388373324160190187140051835877600158453279131187530910662656",
-		"block_hash": "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-		"transactions": [
-		  "0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86"
-		],
-		"withdrawals": [
-		  {
-			"index": "1",
-			"validator_index": "1",
-			"address": "0xcf8e0d4e9587369b2301d0790347320302cc0943",
-			"amount": "1"
-		  }
-		],
-		"blob_gas_used": "2",
- 		"excess_blob_gas": "3"
-	  },
-	"blobs_bundle": {
-      "commitments": [
-        "0x8dab030c51e16e84be9caab84ee3d0b8bbec1db4a0e4de76439da8424d9b957370a10a78851f97e4b54d2ce1ab0d686f"
-      ],
-      "proofs": [
-        "0xb4021b0de10f743893d4f71e1bf830c019e832958efd6795baf2f83b8699a9eccc5dc99015d8d4d8ec370d0cc333c06a",
-        "0xc00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
-      ],
-      "blobs": [
-        "%s"
-      ]
-    }
-  }
-}`, hexutil.Encode(make([]byte, fieldparams.BlobLength)))
-
 func TestExecutionPayloadResponseUnmarshal(t *testing.T) {
 	epr := &ExecPayloadResponse{}
 	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayload), epr))
@@ -977,107 +689,6 @@ func TestExecutionPayloadResponseCapellaUnmarshal(t *testing.T) {
 	assert.Equal(t, uint64(1), w.Amount.Uint64())
 }

-func TestExecutionPayloadResponseDenebUnmarshal(t *testing.T) {
-	epr := &ExecPayloadResponseDeneb{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayloadDeneb), epr))
-	cases := []struct {
-		expected string
-		actual   string
-		name     string
-	}{
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ExecutionPayload.ParentHash),
-			name:     "ExecPayloadResponse.ExecutionPayload.ParentHash",
-		},
-		{
-			expected: "0xabcf8e0d4e9587369b2301d0790347320302cc09",
-			actual:   hexutil.Encode(epr.Data.ExecutionPayload.FeeRecipient),
-			name:     "ExecPayloadResponse.ExecutionPayload.FeeRecipient",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ExecutionPayload.StateRoot),
-			name:     "ExecPayloadResponse.ExecutionPayload.StateRoot",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ExecutionPayload.ReceiptsRoot),
-			name:     "ExecPayloadResponse.ExecutionPayload.ReceiptsRoot",
-		},
-		{
-			expected: "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
-			actual:   hexutil.Encode(epr.Data.ExecutionPayload.LogsBloom),
-			name:     "ExecPayloadResponse.ExecutionPayload.LogsBloom",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ExecutionPayload.PrevRandao),
-			name:     "ExecPayloadResponse.ExecutionPayload.PrevRandao",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", epr.Data.ExecutionPayload.BlockNumber),
-			name:     "ExecPayloadResponse.ExecutionPayload.BlockNumber",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", epr.Data.ExecutionPayload.GasLimit),
-			name:     "ExecPayloadResponse.ExecutionPayload.GasLimit",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", epr.Data.ExecutionPayload.GasUsed),
-			name:     "ExecPayloadResponse.ExecutionPayload.GasUsed",
-		},
-		{
-			expected: "1",
-			actual:   fmt.Sprintf("%d", epr.Data.ExecutionPayload.Timestamp),
-			name:     "ExecPayloadResponse.ExecutionPayload.Timestamp",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ExecutionPayload.ExtraData),
-			name:     "ExecPayloadResponse.ExecutionPayload.ExtraData",
-		},
-		{
-			expected: "452312848583266388373324160190187140051835877600158453279131187530910662656",
-			actual:   fmt.Sprintf("%d", epr.Data.ExecutionPayload.BaseFeePerGas),
-			name:     "ExecPayloadResponse.ExecutionPayload.BaseFeePerGas",
-		},
-		{
-			expected: "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2",
-			actual:   hexutil.Encode(epr.Data.ExecutionPayload.BlockHash),
-			name:     "ExecPayloadResponse.ExecutionPayload.BlockHash",
-		},
-		{
-			expected: "2",
-			actual:   fmt.Sprintf("%d", epr.Data.ExecutionPayload.BlobGasUsed),
-			name:     "ExecPayloadResponse.ExecutionPayload.BlobGasUsed",
-		},
-		{
-			expected: "3",
-			actual:   fmt.Sprintf("%d", epr.Data.ExecutionPayload.ExcessBlobGas),
-			name:     "ExecPayloadResponse.ExecutionPayload.ExcessBlobGas",
-		},
-	}
-	for _, c := range cases {
-		require.Equal(t, c.expected, c.actual, fmt.Sprintf("unexpected value for field %s", c.name))
-	}
-	require.Equal(t, 1, len(epr.Data.ExecutionPayload.Transactions))
-	txHash := "0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86"
-	require.Equal(t, txHash, hexutil.Encode(epr.Data.ExecutionPayload.Transactions[0]))
-
-	require.Equal(t, 1, len(epr.Data.ExecutionPayload.Withdrawals))
-	w := epr.Data.ExecutionPayload.Withdrawals[0]
-	assert.Equal(t, uint64(1), w.Index.Uint64())
-	assert.Equal(t, uint64(1), w.ValidatorIndex.Uint64())
-	assert.DeepEqual(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943", w.Address.String())
-	assert.Equal(t, uint64(1), w.Amount.Uint64())
-	assert.Equal(t, uint64(2), uint64(epr.Data.ExecutionPayload.BlobGasUsed))
-	assert.Equal(t, uint64(3), uint64(epr.Data.ExecutionPayload.ExcessBlobGas))
-}
-
 func TestExecutionPayloadResponseToProto(t *testing.T) {
 	hr := &ExecPayloadResponse{}
 	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayload), hr))
@@ -1182,105 +793,7 @@ func TestExecutionPayloadResponseCapellaToProto(t *testing.T) {
 		},
 	}
 	require.DeepEqual(t, expected, p)
-}

-func TestExecutionPayloadResponseDenebToProto(t *testing.T) {
-	hr := &ExecPayloadResponseDeneb{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayloadDeneb), hr))
-	p, blobsBundle, err := hr.ToProto()
-	require.NoError(t, err)
-
-	parentHash, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	feeRecipient, err := hexutil.Decode("0xabcf8e0d4e9587369b2301d0790347320302cc09")
-	require.NoError(t, err)
-	stateRoot, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	receiptsRoot, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	logsBloom, err := hexutil.Decode("0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000")
-	require.NoError(t, err)
-	prevRandao, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	extraData, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-	blockHash, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2")
-	require.NoError(t, err)
-
-	tx, err := hexutil.Decode("0x02f878831469668303f51d843b9ac9f9843b9aca0082520894c93269b73096998db66be0441e836d873535cb9c8894a19041886f000080c001a031cc29234036afbf9a1fb9476b463367cb1f957ac0b919b69bbc798436e604aaa018c4e9c3914eb27aadd0b91e10b18655739fcf8c1fc398763a9f1beecb8ddc86")
-	require.NoError(t, err)
-	txList := [][]byte{tx}
-	address, err := hexutil.Decode("0xcf8e0d4e9587369b2301d0790347320302cc0943")
-	require.NoError(t, err)
-
-	bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
-	expected := &v1.ExecutionPayloadDeneb{
-		ParentHash:    parentHash,
-		FeeRecipient:  feeRecipient,
-		StateRoot:     stateRoot,
-		ReceiptsRoot:  receiptsRoot,
-		LogsBloom:     logsBloom,
-		PrevRandao:    prevRandao,
-		BlockNumber:   1,
-		GasLimit:      1,
-		GasUsed:       1,
-		Timestamp:     1,
-		ExtraData:     extraData,
-		BaseFeePerGas: bfpg.SSZBytes(),
-		BlockHash:     blockHash,
-		Transactions:  txList,
-		Withdrawals: []*v1.Withdrawal{
-			{
-				Index:          1,
-				ValidatorIndex: 1,
-				Address:        address,
-				Amount:         1,
-			},
-		},
-		BlobGasUsed:   2,
-		ExcessBlobGas: 3,
-	}
-	require.DeepEqual(t, expected, p)
-	commitment, err := hexutil.Decode("0x8dab030c51e16e84be9caab84ee3d0b8bbec1db4a0e4de76439da8424d9b957370a10a78851f97e4b54d2ce1ab0d686f")
-	require.NoError(t, err)
-	proof, err := hexutil.Decode("0xb4021b0de10f743893d4f71e1bf830c019e832958efd6795baf2f83b8699a9eccc5dc99015d8d4d8ec370d0cc333c06a")
-	require.NoError(t, err)
-
-	expectedBlobs := &v1.BlobsBundle{
-		KzgCommitments: [][]byte{
-			commitment,
-		},
-		Proofs: [][]byte{
-			proof,
-		},
-		Blobs: [][]byte{
-			make([]byte, fieldparams.BlobLength),
-		},
-	}
-
-	require.DeepEqual(t, blobsBundle, expectedBlobs)
-}
-
-func TestExecutionPayloadResponseDenebToProtoInvalidBlobCount(t *testing.T) {
-	hr := &ExecPayloadResponseDeneb{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayloadDenebTooManyBlobs), hr))
-	_, _, err := hr.ToProto()
-	require.ErrorContains(t, fmt.Sprintf("blobs length %d is more than max %d", fieldparams.MaxBlobCommitmentsPerBlock+2, fieldparams.MaxBlobCommitmentsPerBlock), err)
-}
-
-func TestExecutionPayloadResponseDenebToProtoDifferentCommitmentCount(t *testing.T) {
-	hr := &ExecPayloadResponseDeneb{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayloadDenebDifferentCommitmentCount), hr))
-	_, _, err := hr.ToProto()
-	require.ErrorContains(t, "commitments length 2 does not equal blobs length 1", err)
-}
-
-func TestExecutionPayloadResponseDenebToProtoDifferentProofCount(t *testing.T) {
-	hr := &ExecPayloadResponseDeneb{}
-	require.NoError(t, json.Unmarshal([]byte(testExampleExecutionPayloadDenebDifferentProofCount), hr))
-	_, _, err := hr.ToProto()
-	require.ErrorContains(t, "proofs length 2 does not equal blobs length 1", err)
 }

 func pbEth1Data() *eth.Eth1Data {
@@ -1513,30 +1026,6 @@ func pbExecutionPayloadHeaderCapella(t *testing.T) *v1.ExecutionPayloadHeaderCap
 	}
 }

-func pbExecutionPayloadHeaderDeneb(t *testing.T) *v1.ExecutionPayloadHeaderDeneb {
-	bfpg, err := stringToUint256("452312848583266388373324160190187140051835877600158453279131187530910662656")
-	require.NoError(t, err)
-	return &v1.ExecutionPayloadHeaderDeneb{
-		ParentHash:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		FeeRecipient:     ezDecode(t, "0xabcf8e0d4e9587369b2301d0790347320302cc09"),
-		StateRoot:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		ReceiptsRoot:     ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		LogsBloom:        ezDecode(t, "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"),
-		PrevRandao:       ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		BlockNumber:      1,
-		GasLimit:         1,
-		GasUsed:          1,
-		Timestamp:        1,
-		ExtraData:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		BaseFeePerGas:    bfpg.SSZBytes(),
-		BlockHash:        ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		TransactionsRoot: ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		WithdrawalsRoot:  ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
-		BlobGasUsed:      1,
-		ExcessBlobGas:    2,
-	}
-}
-
 func TestExecutionPayloadHeader_MarshalJSON(t *testing.T) {
 	h := &ExecutionPayloadHeader{
 		ExecutionPayloadHeader: pbExecutionPayloadHeader(t),
@@ -1557,16 +1046,6 @@ func TestExecutionPayloadHeaderCapella_MarshalJSON(t *testing.T) {
 	require.Equal(t, expected, string(b))
 }

-func TestExecutionPayloadHeaderDeneb_MarshalJSON(t *testing.T) {
-	h := &ExecutionPayloadHeaderDeneb{
-		ExecutionPayloadHeaderDeneb: pbExecutionPayloadHeaderDeneb(t),
-	}
-	b, err := json.Marshal(h)
-	require.NoError(t, err)
-	expected := `{"parent_hash":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","fee_recipient":"0xabcf8e0d4e9587369b2301d0790347320302cc09","state_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","receipts_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","logs_bloom":"0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000","prev_randao":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","block_number":"1","gas_limit":"1","gas_used":"1","timestamp":"1","extra_data":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","base_fee_per_gas":"452312848583266388373324160190187140051835877600158453279131187530910662656","block_hash":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","transactions_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","withdrawals_root":"0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2","blob_gas_used":"1","excess_blob_gas":"2"}`
-	require.Equal(t, expected, string(b))
-}
-
 var testBuilderBid = `{
    "version":"bellatrix",
 	"data":{
@@ -1625,40 +1104,40 @@ func TestIsValidUint256(t *testing.T) {
 	_, ok = value.SetString("-10000000000000000000000000000000000000000000000000000000000000000", 16)
 	require.Equal(t, true, ok)
 	require.Equal(t, 257, value.BitLen())
-	require.Equal(t, false, math.IsValidUint256(value))
+	require.Equal(t, false, isValidUint256(value))

 	// negative uint256.max
 	_, ok = value.SetString("-ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16)
 	require.Equal(t, true, ok)
 	require.Equal(t, 256, value.BitLen())
-	require.Equal(t, false, math.IsValidUint256(value))
+	require.Equal(t, false, isValidUint256(value))

 	// negative number
 	_, ok = value.SetString("-1", 16)
 	require.Equal(t, true, ok)
-	require.Equal(t, false, math.IsValidUint256(value))
+	require.Equal(t, false, isValidUint256(value))

 	// uint256.min
 	_, ok = value.SetString("0", 16)
 	require.Equal(t, true, ok)
-	require.Equal(t, true, math.IsValidUint256(value))
+	require.Equal(t, true, isValidUint256(value))

 	// positive number
 	_, ok = value.SetString("1", 16)
 	require.Equal(t, true, ok)
-	require.Equal(t, true, math.IsValidUint256(value))
+	require.Equal(t, true, isValidUint256(value))

 	// uint256.max
 	_, ok = value.SetString("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 16)
 	require.Equal(t, true, ok)
 	require.Equal(t, 256, value.BitLen())
-	require.Equal(t, true, math.IsValidUint256(value))
+	require.Equal(t, true, isValidUint256(value))

 	// uint256.max + 1
 	_, ok = value.SetString("10000000000000000000000000000000000000000000000000000000000000000", 16)
 	require.Equal(t, true, ok)
 	require.Equal(t, 257, value.BitLen())
-	require.Equal(t, false, math.IsValidUint256(value))
+	require.Equal(t, false, isValidUint256(value))
 }

 func TestUint256Unmarshal(t *testing.T) {
@@ -1677,14 +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
@@ -1718,7 +1189,7 @@ func TestUint256UnmarshalTooBig(t *testing.T) {
 func TestMarshalBlindedBeaconBlockBodyBellatrix(t *testing.T) {
 	expected, err := os.ReadFile("testdata/blinded-block.json")
 	require.NoError(t, err)
-	b, err := shared.BlindedBeaconBlockBellatrixFromConsensus(&eth.BlindedBeaconBlockBellatrix{
+	b := &BlindedBeaconBlockBellatrix{BlindedBeaconBlockBellatrix: &eth.BlindedBeaconBlockBellatrix{
 		Slot:          1,
 		ProposerIndex: 1,
 		ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
@@ -1735,8 +1206,7 @@ func TestMarshalBlindedBeaconBlockBodyBellatrix(t *testing.T) {
 			SyncAggregate:          pbSyncAggregate(),
 			ExecutionPayloadHeader: pbExecutionPayloadHeader(t),
 		},
-	})
-	require.NoError(t, err)
+	}}
 	m, err := json.Marshal(b)
 	require.NoError(t, err)
 	// string error output is easier to deal with
@@ -1748,7 +1218,7 @@ func TestMarshalBlindedBeaconBlockBodyBellatrix(t *testing.T) {
 func TestMarshalBlindedBeaconBlockBodyCapella(t *testing.T) {
 	expected, err := os.ReadFile("testdata/blinded-block-capella.json")
 	require.NoError(t, err)
-	b, err := shared.BlindedBeaconBlockCapellaFromConsensus(&eth.BlindedBeaconBlockCapella{
+	b := &BlindedBeaconBlockCapella{BlindedBeaconBlockCapella: &eth.BlindedBeaconBlockCapella{
 		Slot:          1,
 		ProposerIndex: 1,
 		ParentRoot:    ezDecode(t, "0xcf8e0d4e9587369b2301d0790347320302cc0943d5a1884560367e8208d920f2"),
@@ -1765,8 +1235,7 @@ func TestMarshalBlindedBeaconBlockBodyCapella(t *testing.T) {
 			SyncAggregate:          pbSyncAggregate(),
 			ExecutionPayloadHeader: pbExecutionPayloadHeaderCapella(t),
 		},
-	})
-	require.NoError(t, err)
+	}}
 	m, err := json.Marshal(b)
 	require.NoError(t, err)
 	// string error output is easier to deal with
--- 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 http.StatusNotFound:
-		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: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"
-)
-
-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.Data) == 0 && len(jsonremote.Data) == 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.Data {
-		hexKeys[jsonlocal.Data[index].ValidatingPubkey] = true
-	}
-	for index := range jsonremote.Data {
-		hexKeys[jsonremote.Data[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) (*rpc.ListKeystoresResponse, error) {
-	localBytes, err := c.Get(ctx, localKeysPath, client.WithAuthorizationToken(c.Token()))
-	if err != nil {
-		return nil, err
-	}
-	jsonlocal := &rpc.ListKeystoresResponse{}
-	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) (*rpc.ListRemoteKeysResponse, 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 := &rpc.ListRemoteKeysResponse{}
-	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) (*rpc.GetFeeRecipientByPubkeyResponse, 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 := &rpc.GetFeeRecipientByPubkeyResponse{}
-	if err := json.Unmarshal(b, feejson); err != nil {
-		return nil, errors.Wrap(err, "failed to parse fee recipient")
-	}
-	return feejson, nil
-}
--- a/api/constants.go
+++ b/api/constants.go
@@ -1,3 +0,0 @@
-package api
-
-const WebUrlPrefix = "/v2/validator/"
--- a/api/gateway/BUILD.bazel
+++ b/api/gateway/BUILD.bazel
@@ -14,16 +14,16 @@ go_library(
        "//validator:__subpackages__",
    ],
    deps = [
-        "//api/server:go_default_library",
+        "//api/gateway/apimiddleware:go_default_library",
        "//runtime:go_default_library",
        "@com_github_gorilla_mux//:go_default_library",
        "@com_github_grpc_ecosystem_grpc_gateway_v2//runtime:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_rs_cors//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@org_golang_google_grpc//:go_default_library",
        "@org_golang_google_grpc//connectivity:go_default_library",
        "@org_golang_google_grpc//credentials:go_default_library",
-        "@org_golang_google_grpc//credentials/insecure:go_default_library",
        "@org_golang_google_protobuf//proto:go_default_library",
    ],
 )
@@ -33,6 +33,7 @@ go_test(
    srcs = ["gateway_test.go"],
    embed = [":go_default_library"],
    deps = [
+        "//api/gateway/apimiddleware:go_default_library",
        "//cmd/beacon-chain/flags:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
--- a/api/gateway/apimiddleware/BUILD.bazel
+++ b/api/gateway/apimiddleware/BUILD.bazel
@@ -0,0 +1,41 @@
+load("@prysm//tools/go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "api_middleware.go",
+        "log.go",
+        "param_handling.go",
+        "process_field.go",
+        "process_request.go",
+        "structs.go",
+    ],
+    importpath = "github.com/prysmaticlabs/prysm/v4/api/gateway/apimiddleware",
+    visibility = ["//visibility:public"],
+    deps = [
+        "//api/grpc:go_default_library",
+        "//encoding/bytesutil:go_default_library",
+        "@com_github_ethereum_go_ethereum//common:go_default_library",
+        "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
+        "@com_github_gorilla_mux//:go_default_library",
+        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_sirupsen_logrus//:go_default_library",
+        "@com_github_wealdtech_go_bytesutil//:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = [
+        "param_handling_test.go",
+        "process_request_test.go",
+    ],
+    embed = [":go_default_library"],
+    deps = [
+        "//api/grpc:go_default_library",
+        "//testing/assert:go_default_library",
+        "//testing/require:go_default_library",
+        "@com_github_gorilla_mux//:go_default_library",
+        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
+    ],
+)
--- a/api/gateway/apimiddleware/api_middleware.go
+++ b/api/gateway/apimiddleware/api_middleware.go
@@ -0,0 +1,265 @@
+package apimiddleware
+
+import (
+	"net/http"
+	"reflect"
+	"time"
+
+	"github.com/gorilla/mux"
+)
+
+// ApiProxyMiddleware is a proxy between an Ethereum consensus API HTTP client and grpc-gateway.
+// The purpose of the proxy is to handle HTTP requests and gRPC responses in such a way that:
+//   - Ethereum consensus API requests can be handled by grpc-gateway correctly
+//   - gRPC responses can be returned as spec-compliant Ethereum consensus API responses
+type ApiProxyMiddleware struct {
+	GatewayAddress  string
+	EndpointCreator EndpointFactory
+	Timeout         time.Duration
+	router          *mux.Router
+}
+
+// EndpointFactory is responsible for creating new instances of Endpoint values.
+type EndpointFactory interface {
+	Create(path string) (*Endpoint, error)
+	Paths() []string
+	IsNil() bool
+}
+
+// Endpoint is a representation of an API HTTP endpoint that should be proxied by the middleware.
+type Endpoint struct {
+	Path               string          // The path of the HTTP endpoint.
+	GetResponse        interface{}     // The struct corresponding to the JSON structure used in a GET response.
+	PostRequest        interface{}     // The struct corresponding to the JSON structure used in a POST request.
+	PostResponse       interface{}     // The struct corresponding to the JSON structure used in a POST response.
+	DeleteRequest      interface{}     // The struct corresponding to the JSON structure used in a DELETE request.
+	DeleteResponse     interface{}     // The struct corresponding to the JSON structure used in a DELETE response.
+	RequestURLLiterals []string        // Names of URL parameters that should not be base64-encoded.
+	RequestQueryParams []QueryParam    // Query parameters of the request.
+	Err                ErrorJson       // The struct corresponding to the error that should be returned in case of a request failure.
+	Hooks              HookCollection  // A collection of functions that can be invoked at various stages of the request/response cycle.
+	CustomHandlers     []CustomHandler // Functions that will be executed instead of the default request/response behaviour.
+}
+
+// RunDefault expresses whether the default processing logic should be carried out after running a pre hook.
+type RunDefault bool
+
+// DefaultEndpoint returns an Endpoint with default configuration, e.g. DefaultErrorJson for error handling.
+func DefaultEndpoint() Endpoint {
+	return Endpoint{
+		Err: &DefaultErrorJson{},
+	}
+}
+
+// QueryParam represents a single query parameter's metadata.
+type QueryParam struct {
+	Name string
+	Hex  bool
+	Enum bool
+}
+
+// CustomHandler is a function that can be invoked at the very beginning of the request,
+// essentially replacing the whole default request/response logic with custom logic for a specific endpoint.
+type CustomHandler = func(m *ApiProxyMiddleware, endpoint Endpoint, w http.ResponseWriter, req *http.Request) (handled bool)
+
+// HookCollection contains hooks that can be used to amend the default request/response cycle with custom logic for a specific endpoint.
+type HookCollection struct {
+	OnPreDeserializeRequestBodyIntoContainer      func(endpoint *Endpoint, w http.ResponseWriter, req *http.Request) (RunDefault, ErrorJson)
+	OnPostDeserializeRequestBodyIntoContainer     func(endpoint *Endpoint, w http.ResponseWriter, req *http.Request) ErrorJson
+	OnPreDeserializeGrpcResponseBodyIntoContainer func([]byte, interface{}) (RunDefault, ErrorJson)
+	OnPreSerializeMiddlewareResponseIntoJson      func(interface{}) (RunDefault, []byte, ErrorJson)
+}
+
+// fieldProcessor applies the processing function f to a value when the tag is present on the field.
+type fieldProcessor struct {
+	tag string
+	f   func(value reflect.Value) error
+}
+
+// Run starts the proxy, registering all proxy endpoints.
+func (m *ApiProxyMiddleware) Run(gatewayRouter *mux.Router) {
+	for _, path := range m.EndpointCreator.Paths() {
+		gatewayRouter.HandleFunc(path, m.WithMiddleware(path))
+	}
+	m.router = gatewayRouter
+}
+
+// ServeHTTP for the proxy middleware.
+func (m *ApiProxyMiddleware) ServeHTTP(w http.ResponseWriter, req *http.Request) {
+	m.router.ServeHTTP(w, req)
+}
+
+// WithMiddleware wraps the given endpoint handler with the middleware logic.
+func (m *ApiProxyMiddleware) WithMiddleware(path string) http.HandlerFunc {
+	return func(w http.ResponseWriter, req *http.Request) {
+		endpoint, err := m.EndpointCreator.Create(path)
+		if err != nil {
+			log.WithError(err).Errorf("Could not create endpoint for path: %s", path)
+			return
+		}
+
+		for _, handler := range endpoint.CustomHandlers {
+			if handler(m, *endpoint, w, req) {
+				return
+			}
+		}
+
+		if req.Method == "POST" {
+			if errJson := handlePostRequestForEndpoint(endpoint, w, req); errJson != nil {
+				WriteError(w, errJson, nil)
+				return
+			}
+		}
+
+		if req.Method == "DELETE" && req.Body != http.NoBody {
+			if errJson := handleDeleteRequestForEndpoint(endpoint, req); errJson != nil {
+				WriteError(w, errJson, nil)
+				return
+			}
+		}
+
+		if errJson := m.PrepareRequestForProxying(*endpoint, req); errJson != nil {
+			WriteError(w, errJson, nil)
+			return
+		}
+		grpcResp, errJson := m.ProxyRequest(req)
+		if errJson != nil {
+			WriteError(w, errJson, nil)
+			return
+		}
+		grpcRespBody, errJson := ReadGrpcResponseBody(grpcResp.Body)
+		if errJson != nil {
+			WriteError(w, errJson, nil)
+			return
+		}
+
+		var respJson []byte
+		if !GrpcResponseIsEmpty(grpcRespBody) {
+			respHasError, errJson := HandleGrpcResponseError(endpoint.Err, grpcResp, grpcRespBody, w)
+			if errJson != nil {
+				WriteError(w, errJson, nil)
+				return
+			}
+			if respHasError {
+				return
+			}
+
+			var resp interface{}
+			if req.Method == "GET" {
+				resp = endpoint.GetResponse
+			} else if req.Method == "DELETE" {
+				resp = endpoint.DeleteResponse
+			} else {
+				resp = endpoint.PostResponse
+			}
+			if errJson := deserializeGrpcResponseBodyIntoContainerWrapped(endpoint, grpcRespBody, resp); errJson != nil {
+				WriteError(w, errJson, nil)
+				return
+			}
+			if errJson := ProcessMiddlewareResponseFields(resp); errJson != nil {
+				WriteError(w, errJson, nil)
+				return
+			}
+
+			respJson, errJson = serializeMiddlewareResponseIntoJsonWrapped(endpoint, respJson, resp)
+			if errJson != nil {
+				WriteError(w, errJson, nil)
+				return
+			}
+		}
+
+		if errJson := WriteMiddlewareResponseHeadersAndBody(grpcResp, respJson, w); errJson != nil {
+			WriteError(w, errJson, nil)
+			return
+		}
+		if errJson := Cleanup(grpcResp.Body); errJson != nil {
+			WriteError(w, errJson, nil)
+			return
+		}
+	}
+}
+
+func handlePostRequestForEndpoint(endpoint *Endpoint, w http.ResponseWriter, req *http.Request) ErrorJson {
+	if errJson := deserializeRequestBodyIntoContainerWrapped(endpoint, req, w); errJson != nil {
+		return errJson
+	}
+	if errJson := ProcessRequestContainerFields(endpoint.PostRequest); errJson != nil {
+		return errJson
+	}
+	return SetRequestBodyToRequestContainer(endpoint.PostRequest, req)
+}
+
+func handleDeleteRequestForEndpoint(endpoint *Endpoint, req *http.Request) ErrorJson {
+	if errJson := DeserializeRequestBodyIntoContainer(req.Body, endpoint.DeleteRequest); errJson != nil {
+		return errJson
+	}
+	if errJson := ProcessRequestContainerFields(endpoint.DeleteRequest); errJson != nil {
+		return errJson
+	}
+	return SetRequestBodyToRequestContainer(endpoint.DeleteRequest, req)
+}
+
+func deserializeRequestBodyIntoContainerWrapped(endpoint *Endpoint, req *http.Request, w http.ResponseWriter) ErrorJson {
+	runDefault := true
+	if endpoint.Hooks.OnPreDeserializeRequestBodyIntoContainer != nil {
+		run, errJson := endpoint.Hooks.OnPreDeserializeRequestBodyIntoContainer(endpoint, w, req)
+		if errJson != nil {
+			return errJson
+		}
+		if !run {
+			runDefault = false
+		}
+	}
+	if runDefault {
+		if errJson := DeserializeRequestBodyIntoContainer(req.Body, endpoint.PostRequest); errJson != nil {
+			return errJson
+		}
+	}
+	if endpoint.Hooks.OnPostDeserializeRequestBodyIntoContainer != nil {
+		if errJson := endpoint.Hooks.OnPostDeserializeRequestBodyIntoContainer(endpoint, w, req); errJson != nil {
+			return errJson
+		}
+	}
+	return nil
+}
+
+func deserializeGrpcResponseBodyIntoContainerWrapped(endpoint *Endpoint, grpcResponseBody []byte, resp interface{}) ErrorJson {
+	runDefault := true
+	if endpoint.Hooks.OnPreDeserializeGrpcResponseBodyIntoContainer != nil {
+		run, errJson := endpoint.Hooks.OnPreDeserializeGrpcResponseBodyIntoContainer(grpcResponseBody, resp)
+		if errJson != nil {
+			return errJson
+		}
+		if !run {
+			runDefault = false
+		}
+	}
+	if runDefault {
+		if errJson := DeserializeGrpcResponseBodyIntoContainer(grpcResponseBody, resp); errJson != nil {
+			return errJson
+		}
+	}
+	return nil
+}
+
+func serializeMiddlewareResponseIntoJsonWrapped(endpoint *Endpoint, respJson []byte, resp interface{}) ([]byte, ErrorJson) {
+	runDefault := true
+	var errJson ErrorJson
+	if endpoint.Hooks.OnPreSerializeMiddlewareResponseIntoJson != nil {
+		var run RunDefault
+		run, respJson, errJson = endpoint.Hooks.OnPreSerializeMiddlewareResponseIntoJson(resp)
+		if errJson != nil {
+			return nil, errJson
+		}
+		if !run {
+			runDefault = false
+		}
+	}
+	if runDefault {
+		respJson, errJson = SerializeMiddlewareResponseIntoJson(resp)
+		if errJson != nil {
+			return nil, errJson
+		}
+	}
+	return respJson, nil
+}
--- a/api/gateway/apimiddleware/log.go
+++ b/api/gateway/apimiddleware/log.go
@@ -0,0 +1,5 @@
+package apimiddleware
+
+import "github.com/sirupsen/logrus"
+
+var log = logrus.WithField("prefix", "apimiddleware")
--- a/api/gateway/apimiddleware/param_handling.go
+++ b/api/gateway/apimiddleware/param_handling.go
@@ -0,0 +1,103 @@
+package apimiddleware
+
+import (
+	"encoding/base64"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/gorilla/mux"
+	butil "github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	"github.com/wealdtech/go-bytesutil"
+)
+
+// HandleURLParameters processes URL parameters, allowing parameterized URLs to be safely and correctly proxied to grpc-gateway.
+func HandleURLParameters(url string, req *http.Request, literals []string) ErrorJson {
+	segments := strings.Split(url, "/")
+
+segmentsLoop:
+	for i, s := range segments {
+		// We only care about segments which are parameterized.
+		if isRequestParam(s) {
+			// Don't do anything with parameters which should be forwarded literally to gRPC.
+			for _, l := range literals {
+				if s == "{"+l+"}" {
+					continue segmentsLoop
+				}
+			}
+
+			routeVar := mux.Vars(req)[s[1:len(s)-1]]
+			bRouteVar := []byte(routeVar)
+			if butil.IsHex(bRouteVar) {
+				var err error
+				bRouteVar, err = bytesutil.FromHexString(string(bRouteVar))
+				if err != nil {
+					return InternalServerErrorWithMessage(err, "could not process URL parameter")
+				}
+			}
+			// Converting hex to base64 may result in a value which malforms the URL.
+			// We use URLEncoding to safely escape such values.
+			base64RouteVar := base64.URLEncoding.EncodeToString(bRouteVar)
+
+			// Merge segments back into the full URL.
+			splitPath := strings.Split(req.URL.Path, "/")
+			splitPath[i] = base64RouteVar
+			req.URL.Path = strings.Join(splitPath, "/")
+		}
+	}
+	return nil
+}
+
+// HandleQueryParameters processes query parameters, allowing them to be safely and correctly proxied to grpc-gateway.
+func HandleQueryParameters(req *http.Request, params []QueryParam) ErrorJson {
+	queryParams := req.URL.Query()
+
+	normalizeQueryValues(queryParams)
+
+	for key, vals := range queryParams {
+		for _, p := range params {
+			if key == p.Name {
+				if p.Hex {
+					queryParams.Del(key)
+					for _, v := range vals {
+						b := []byte(v)
+						if butil.IsHex(b) {
+							var err error
+							b, err = bytesutil.FromHexString(v)
+							if err != nil {
+								return InternalServerErrorWithMessage(err, "could not process query parameter")
+							}
+						}
+						queryParams.Add(key, base64.URLEncoding.EncodeToString(b))
+					}
+				}
+				if p.Enum {
+					queryParams.Del(key)
+					for _, v := range vals {
+						// gRPC expects uppercase enum values.
+						queryParams.Add(key, strings.ToUpper(v))
+					}
+				}
+			}
+		}
+	}
+	req.URL.RawQuery = queryParams.Encode()
+	return nil
+}
+
+// isRequestParam verifies whether the passed string is a request parameter.
+// Request parameters are enclosed in { and }.
+func isRequestParam(s string) bool {
+	return len(s) > 2 && s[0] == '{' && s[len(s)-1] == '}'
+}
+
+func normalizeQueryValues(queryParams url.Values) {
+	// Replace comma-separated values with individual values.
+	for key, vals := range queryParams {
+		splitVals := make([]string, 0)
+		for _, v := range vals {
+			splitVals = append(splitVals, strings.Split(v, ",")...)
+		}
+		queryParams[key] = splitVals
+	}
+}
--- a/api/gateway/apimiddleware/param_handling_test.go
+++ b/api/gateway/apimiddleware/param_handling_test.go
@@ -0,0 +1,124 @@
+package apimiddleware
+
+import (
+	"bytes"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/gorilla/mux"
+	"github.com/prysmaticlabs/prysm/v4/testing/assert"
+	"github.com/prysmaticlabs/prysm/v4/testing/require"
+)
+
+func TestHandleURLParameters(t *testing.T) {
+	var body bytes.Buffer
+
+	t.Run("no_params", func(t *testing.T) {
+		request := httptest.NewRequest("GET", "http://foo.example/bar", &body)
+
+		errJson := HandleURLParameters("/not_param", request, []string{})
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, "/bar", request.URL.Path)
+	})
+
+	t.Run("with_params", func(t *testing.T) {
+		muxVars := make(map[string]string)
+		muxVars["bar_param"] = "bar"
+		muxVars["quux_param"] = "quux"
+		request := httptest.NewRequest("GET", "http://foo.example/bar/baz/quux", &body)
+		request = mux.SetURLVars(request, muxVars)
+
+		errJson := HandleURLParameters("/{bar_param}/not_param/{quux_param}", request, []string{})
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, "/YmFy/baz/cXV1eA==", request.URL.Path)
+	})
+
+	t.Run("with_literal", func(t *testing.T) {
+		muxVars := make(map[string]string)
+		muxVars["bar_param"] = "bar"
+		request := httptest.NewRequest("GET", "http://foo.example/bar/baz", &body)
+		request = mux.SetURLVars(request, muxVars)
+
+		errJson := HandleURLParameters("/{bar_param}/not_param/", request, []string{"bar_param"})
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, "/bar/baz", request.URL.Path)
+	})
+
+	t.Run("with_hex", func(t *testing.T) {
+		muxVars := make(map[string]string)
+		muxVars["hex_param"] = "0x626172"
+		request := httptest.NewRequest("GET", "http://foo.example/0x626172/baz", &body)
+		request = mux.SetURLVars(request, muxVars)
+
+		errJson := HandleURLParameters("/{hex_param}/not_param/", request, []string{})
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, "/YmFy/baz", request.URL.Path)
+	})
+}
+
+func TestHandleQueryParameters(t *testing.T) {
+	var body bytes.Buffer
+
+	t.Run("regular_params", func(t *testing.T) {
+		request := httptest.NewRequest("GET", "http://foo.example?bar=bar&baz=baz", &body)
+
+		errJson := HandleQueryParameters(request, []QueryParam{{Name: "bar"}, {Name: "baz"}})
+		require.Equal(t, true, errJson == nil)
+		query := request.URL.Query()
+		v, ok := query["bar"]
+		require.Equal(t, true, ok, "query param not found")
+		require.Equal(t, 1, len(v), "wrong number of query param values")
+		assert.Equal(t, "bar", v[0])
+		v, ok = query["baz"]
+		require.Equal(t, true, ok, "query param not found")
+		require.Equal(t, 1, len(v), "wrong number of query param values")
+		assert.Equal(t, "baz", v[0])
+	})
+
+	t.Run("hex_and_enum_params", func(t *testing.T) {
+		request := httptest.NewRequest("GET", "http://foo.example?hex=0x626172&baz=baz", &body)
+
+		errJson := HandleQueryParameters(request, []QueryParam{{Name: "hex", Hex: true}, {Name: "baz", Enum: true}})
+		require.Equal(t, true, errJson == nil)
+		query := request.URL.Query()
+		v, ok := query["hex"]
+		require.Equal(t, true, ok, "query param not found")
+		require.Equal(t, 1, len(v), "wrong number of query param values")
+		assert.Equal(t, "YmFy", v[0])
+		v, ok = query["baz"]
+		require.Equal(t, true, ok, "query param not found")
+		require.Equal(t, 1, len(v), "wrong number of query param values")
+		assert.Equal(t, "BAZ", v[0])
+	})
+}
+
+func TestIsRequestParam(t *testing.T) {
+	tests := []struct {
+		s string
+		b bool
+	}{
+		{"", false},
+		{"{", false},
+		{"}", false},
+		{"{}", false},
+		{"{x}", true},
+		{"{very_long_parameter_name_with_underscores}", true},
+	}
+	for _, tt := range tests {
+		b := isRequestParam(tt.s)
+		assert.Equal(t, tt.b, b)
+	}
+}
+
+func TestNormalizeQueryValues(t *testing.T) {
+	input := make(map[string][]string)
+	input["key"] = []string{"value1", "value2,value3,value4", "value5"}
+
+	normalizeQueryValues(input)
+	require.Equal(t, 5, len(input["key"]))
+	assert.Equal(t, "value1", input["key"][0])
+	assert.Equal(t, "value2", input["key"][1])
+	assert.Equal(t, "value3", input["key"][2])
+	assert.Equal(t, "value4", input["key"][3])
+	assert.Equal(t, "value5", input["key"][4])
+}
--- a/api/gateway/apimiddleware/process_field.go
+++ b/api/gateway/apimiddleware/process_field.go
@@ -0,0 +1,179 @@
+package apimiddleware
+
+import (
+	"encoding/base64"
+	"fmt"
+	"math/big"
+	"reflect"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+	"github.com/pkg/errors"
+	"github.com/wealdtech/go-bytesutil"
+)
+
+// processField calls each processor function on any field that has the matching tag set.
+// It is a recursive function.
+func processField(s interface{}, processors []fieldProcessor) error {
+	kind := reflect.TypeOf(s).Kind()
+	if kind != reflect.Ptr && kind != reflect.Slice && kind != reflect.Array {
+		return fmt.Errorf("processing fields of kind '%v' is unsupported", kind)
+	}
+
+	t := reflect.TypeOf(s).Elem()
+	v := reflect.Indirect(reflect.ValueOf(s))
+
+	for i := 0; i < t.NumField(); i++ {
+		switch v.Field(i).Kind() {
+		case reflect.Slice:
+			sliceElem := t.Field(i).Type.Elem()
+			kind := sliceElem.Kind()
+			// Recursively process slices to struct pointers.
+			switch {
+			case kind == reflect.Ptr && sliceElem.Elem().Kind() == reflect.Struct:
+				for j := 0; j < v.Field(i).Len(); j++ {
+					if err := processField(v.Field(i).Index(j).Interface(), processors); err != nil {
+						return errors.Wrapf(err, "could not process field '%s'", t.Field(i).Name)
+					}
+				}
+			// Process each string in string slices.
+			case kind == reflect.String:
+				for _, proc := range processors {
+					_, hasTag := t.Field(i).Tag.Lookup(proc.tag)
+					if !hasTag {
+						continue
+					}
+					for j := 0; j < v.Field(i).Len(); j++ {
+						if err := proc.f(v.Field(i).Index(j)); err != nil {
+							return errors.Wrapf(err, "could not process field '%s'", t.Field(i).Name)
+						}
+					}
+				}
+			}
+		// Recursively process struct pointers.
+		case reflect.Ptr:
+			if v.Field(i).Elem().Kind() == reflect.Struct {
+				if err := processField(v.Field(i).Interface(), processors); err != nil {
+					return errors.Wrapf(err, "could not process field '%s'", t.Field(i).Name)
+				}
+			}
+		default:
+			field := t.Field(i)
+			for _, proc := range processors {
+				if _, hasTag := field.Tag.Lookup(proc.tag); hasTag {
+					if err := proc.f(v.Field(i)); err != nil {
+						return errors.Wrapf(err, "could not process field '%s'", t.Field(i).Name)
+					}
+				}
+			}
+		}
+	}
+	return nil
+}
+
+func hexToBase64Processor(v reflect.Value) error {
+	if v.String() == "0x" {
+		v.SetString("")
+		return nil
+	}
+	b, err := bytesutil.FromHexString(v.String())
+	if err != nil {
+		return err
+	}
+	v.SetString(base64.StdEncoding.EncodeToString(b))
+	return nil
+}
+
+func base64ToHexProcessor(v reflect.Value) error {
+	if v.String() == "" {
+		// Empty hex values are represented as "0x".
+		v.SetString("0x")
+		return nil
+	}
+	b, err := base64.StdEncoding.DecodeString(v.String())
+	if err != nil {
+		return err
+	}
+	v.SetString(hexutil.Encode(b))
+	return nil
+}
+
+func base64ToChecksumAddressProcessor(v reflect.Value) error {
+	if v.String() == "" {
+		// Empty hex values are represented as "0x".
+		v.SetString("0x")
+		return nil
+	}
+	b, err := base64.StdEncoding.DecodeString(v.String())
+	if err != nil {
+		return err
+	}
+	v.SetString(common.BytesToAddress(b).Hex())
+	return nil
+}
+
+func base64ToUint256Processor(v reflect.Value) error {
+	if v.String() == "" {
+		return nil
+	}
+	littleEndian, err := base64.StdEncoding.DecodeString(v.String())
+	if err != nil {
+		return err
+	}
+	if len(littleEndian) != 32 {
+		return errors.New("invalid length for Uint256")
+	}
+
+	// Integers are stored as little-endian, but
+	// big.Int expects big-endian. So we need to reverse
+	// the byte order before decoding.
+	var bigEndian [32]byte
+	for i := 0; i < len(littleEndian); i++ {
+		bigEndian[i] = littleEndian[len(littleEndian)-1-i]
+	}
+	var uint256 big.Int
+	uint256.SetBytes(bigEndian[:])
+	v.SetString(uint256.String())
+	return nil
+}
+
+func uint256ToBase64Processor(v reflect.Value) error {
+	if v.String() == "" {
+		return nil
+	}
+	uint256, ok := new(big.Int).SetString(v.String(), 10)
+	if !ok {
+		return fmt.Errorf("could not parse Uint256")
+	}
+	bigEndian := uint256.Bytes()
+	if len(bigEndian) > 32 {
+		return fmt.Errorf("number too big for Uint256")
+	}
+
+	// Integers are stored as little-endian, but
+	// big.Int gives big-endian. So we need to reverse
+	// the byte order before encoding.
+	var littleEndian [32]byte
+	for i := 0; i < len(bigEndian); i++ {
+		littleEndian[i] = bigEndian[len(bigEndian)-1-i]
+	}
+	v.SetString(base64.StdEncoding.EncodeToString(littleEndian[:]))
+	return nil
+}
+
+func enumToLowercaseProcessor(v reflect.Value) error {
+	v.SetString(strings.ToLower(v.String()))
+	return nil
+}
+
+func timeToUnixProcessor(v reflect.Value) error {
+	t, err := time.Parse(time.RFC3339, v.String())
+	if err != nil {
+		return err
+	}
+	v.SetString(strconv.FormatUint(uint64(t.Unix()), 10))
+	return nil
+}
--- a/api/gateway/apimiddleware/process_request.go
+++ b/api/gateway/apimiddleware/process_request.go
@@ -0,0 +1,276 @@
+package apimiddleware
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net"
+	"net/http"
+	"strconv"
+	"strings"
+
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v4/api/grpc"
+)
+
+// DeserializeRequestBodyIntoContainer deserializes the request's body into an endpoint-specific struct.
+func DeserializeRequestBodyIntoContainer(body io.Reader, requestContainer interface{}) ErrorJson {
+	decoder := json.NewDecoder(body)
+	decoder.DisallowUnknownFields()
+	if err := decoder.Decode(&requestContainer); err != nil {
+		if strings.Contains(err.Error(), "json: unknown field") {
+			e := errors.Wrap(err, "could not decode request body")
+			return &DefaultErrorJson{
+				Message: e.Error(),
+				Code:    http.StatusBadRequest,
+			}
+		}
+		return InternalServerErrorWithMessage(err, "could not decode request body")
+	}
+	return nil
+}
+
+// ProcessRequestContainerFields processes fields of an endpoint-specific container according to field tags.
+func ProcessRequestContainerFields(requestContainer interface{}) ErrorJson {
+	if err := processField(requestContainer, []fieldProcessor{
+		{
+			tag: "hex",
+			f:   hexToBase64Processor,
+		},
+		{
+			tag: "uint256",
+			f:   uint256ToBase64Processor,
+		},
+	}); err != nil {
+		return InternalServerErrorWithMessage(err, "could not process request data")
+	}
+	return nil
+}
+
+// SetRequestBodyToRequestContainer makes the endpoint-specific container the new body of the request.
+func SetRequestBodyToRequestContainer(requestContainer interface{}, req *http.Request) ErrorJson {
+	// Serialize the struct, which now includes a base64-encoded value, into JSON.
+	j, err := json.Marshal(requestContainer)
+	if err != nil {
+		return InternalServerErrorWithMessage(err, "could not marshal request")
+	}
+	// Set the body to the new JSON.
+	req.Body = io.NopCloser(bytes.NewReader(j))
+	req.Header.Set("Content-Length", strconv.Itoa(len(j)))
+	req.ContentLength = int64(len(j))
+	return nil
+}
+
+// PrepareRequestForProxying applies additional logic to the request so that it can be correctly proxied to grpc-gateway.
+func (m *ApiProxyMiddleware) PrepareRequestForProxying(endpoint Endpoint, req *http.Request) ErrorJson {
+	req.URL.Scheme = "http"
+	req.URL.Host = m.GatewayAddress
+	req.RequestURI = ""
+	if errJson := HandleURLParameters(endpoint.Path, req, endpoint.RequestURLLiterals); errJson != nil {
+		return errJson
+	}
+	if errJson := HandleQueryParameters(req, endpoint.RequestQueryParams); errJson != nil {
+		return errJson
+	}
+	// We have to add the prefix after handling parameters because adding the prefix changes URL segment indexing.
+	req.URL.Path = "/internal" + req.URL.Path
+	return nil
+}
+
+// ProxyRequest proxies the request to grpc-gateway.
+func (m *ApiProxyMiddleware) ProxyRequest(req *http.Request) (*http.Response, ErrorJson) {
+	// We do not use http.DefaultClient because it does not have any timeout.
+	netClient := &http.Client{Timeout: m.Timeout}
+	grpcResp, err := netClient.Do(req)
+	if err != nil {
+		if err, ok := err.(net.Error); ok && err.Timeout() {
+			return nil, TimeoutError()
+		}
+		return nil, InternalServerErrorWithMessage(err, "could not proxy request")
+	}
+	if grpcResp == nil {
+		return nil, &DefaultErrorJson{Message: "nil response from gRPC-gateway", Code: http.StatusInternalServerError}
+	}
+	return grpcResp, nil
+}
+
+// ReadGrpcResponseBody reads the body from the grpc-gateway's response.
+func ReadGrpcResponseBody(r io.Reader) ([]byte, ErrorJson) {
+	body, err := io.ReadAll(r)
+	if err != nil {
+		return nil, InternalServerErrorWithMessage(err, "could not read response body")
+	}
+	return body, nil
+}
+
+// HandleGrpcResponseError acts on an error that resulted from a grpc-gateway's response.
+// Whether there was an error is indicated by the bool return value. In case of an error,
+// there is no need to write to the response because it's taken care of by the function.
+func HandleGrpcResponseError(errJson ErrorJson, resp *http.Response, respBody []byte, w http.ResponseWriter) (bool, ErrorJson) {
+	responseHasError := false
+	if err := json.Unmarshal(respBody, errJson); err != nil {
+		return false, InternalServerErrorWithMessage(err, "could not unmarshal error")
+	}
+	if errJson.Msg() != "" {
+		responseHasError = true
+		// 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 {
+				w.Header().Set(h, v)
+			}
+		}
+		// Handle gRPC timeout.
+		if resp.StatusCode == http.StatusGatewayTimeout {
+			WriteError(w, TimeoutError(), resp.Header)
+		} else {
+			// Set code to HTTP code because unmarshalled body contained gRPC code.
+			errJson.SetCode(resp.StatusCode)
+			WriteError(w, errJson, resp.Header)
+		}
+	}
+	return responseHasError, nil
+}
+
+// GrpcResponseIsEmpty determines whether the grpc-gateway's response body contains no data.
+func GrpcResponseIsEmpty(grpcResponseBody []byte) bool {
+	return len(grpcResponseBody) == 0 || string(grpcResponseBody) == "{}"
+}
+
+// DeserializeGrpcResponseBodyIntoContainer deserializes the grpc-gateway's response body into an endpoint-specific struct.
+func DeserializeGrpcResponseBodyIntoContainer(body []byte, responseContainer interface{}) ErrorJson {
+	if err := json.Unmarshal(body, &responseContainer); err != nil {
+		return InternalServerErrorWithMessage(err, "could not unmarshal response")
+	}
+	return nil
+}
+
+// ProcessMiddlewareResponseFields processes fields of an endpoint-specific container according to field tags.
+func ProcessMiddlewareResponseFields(responseContainer interface{}) ErrorJson {
+	if err := processField(responseContainer, []fieldProcessor{
+		{
+			tag: "hex",
+			f:   base64ToHexProcessor,
+		},
+		{
+			tag: "address",
+			f:   base64ToChecksumAddressProcessor,
+		},
+		{
+			tag: "enum",
+			f:   enumToLowercaseProcessor,
+		},
+		{
+			tag: "time",
+			f:   timeToUnixProcessor,
+		},
+		{
+			tag: "uint256",
+			f:   base64ToUint256Processor,
+		},
+	}); err != nil {
+		return InternalServerErrorWithMessage(err, "could not process response data")
+	}
+	return nil
+}
+
+// SerializeMiddlewareResponseIntoJson serializes the endpoint-specific response struct into a JSON representation.
+func SerializeMiddlewareResponseIntoJson(responseContainer interface{}) (jsonResponse []byte, errJson ErrorJson) {
+	j, err := json.Marshal(responseContainer)
+	if err != nil {
+		return nil, InternalServerErrorWithMessage(err, "could not marshal response")
+	}
+	return j, nil
+}
+
+// WriteMiddlewareResponseHeadersAndBody populates headers and the body of the final response.
+func WriteMiddlewareResponseHeadersAndBody(grpcResp *http.Response, responseJson []byte, w http.ResponseWriter) ErrorJson {
+	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-Metadata") {
+			if h == "Grpc-Metadata-"+grpc.HttpCodeMetadataKey {
+				statusCodeHeader = vs[0]
+			}
+		} else {
+			for _, v := range vs {
+				w.Header().Set(h, v)
+			}
+		}
+	}
+	if !GrpcResponseIsEmpty(responseJson) {
+		w.Header().Set("Content-Length", strconv.Itoa(len(responseJson)))
+		if statusCodeHeader != "" {
+			code, err := strconv.Atoi(statusCodeHeader)
+			if err != nil {
+				return InternalServerErrorWithMessage(err, "could not parse status code")
+			}
+			w.WriteHeader(code)
+		} else {
+			w.WriteHeader(grpcResp.StatusCode)
+		}
+		if _, err := io.Copy(w, io.NopCloser(bytes.NewReader(responseJson))); err != nil {
+			return InternalServerErrorWithMessage(err, "could not write response message")
+		}
+	} else {
+		w.Header().Set("Content-Length", "0")
+		w.WriteHeader(grpcResp.StatusCode)
+	}
+	return nil
+}
+
+// WriteError writes the error by manipulating headers and the body of the final response.
+func WriteError(w http.ResponseWriter, errJson ErrorJson, responseHeader http.Header) {
+	// Include custom error in the error JSON.
+	hasCustomError := false
+	if responseHeader != nil {
+		customError, ok := responseHeader["Grpc-Metadata-"+grpc.CustomErrorMetadataKey]
+		if ok {
+			hasCustomError = true
+			// Assume header has only one value and read the 0 index.
+			if err := json.Unmarshal([]byte(customError[0]), errJson); err != nil {
+				log.WithError(err).Error("Could not unmarshal custom error message")
+				return
+			}
+		}
+	}
+
+	var j []byte
+	if hasCustomError {
+		var err error
+		j, err = json.Marshal(errJson)
+		if err != nil {
+			log.WithError(err).Error("Could not marshal error message")
+			return
+		}
+	} else {
+		var err error
+		// We marshal the response body into a DefaultErrorJson if the custom error is not present.
+		// This is because the ErrorJson argument is the endpoint's error definition, which may contain custom fields.
+		// In such a scenario marhaling the endpoint's error would populate the resulting JSON
+		// with these fields even if they are not present in the gRPC header.
+		d := &DefaultErrorJson{
+			Message: errJson.Msg(),
+			Code:    errJson.StatusCode(),
+		}
+		j, err = json.Marshal(d)
+		if err != nil {
+			log.WithError(err).Error("Could not marshal error message")
+			return
+		}
+	}
+
+	w.Header().Set("Content-Length", strconv.Itoa(len(j)))
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(errJson.StatusCode())
+	if _, err := io.Copy(w, io.NopCloser(bytes.NewReader(j))); err != nil {
+		log.WithError(err).Error("Could not write error message")
+	}
+}
+
+// Cleanup performs final cleanup on the initial response from grpc-gateway.
+func Cleanup(grpcResponseBody io.ReadCloser) ErrorJson {
+	if err := grpcResponseBody.Close(); err != nil {
+		return InternalServerErrorWithMessage(err, "could not close response body")
+	}
+	return nil
+}
--- a/api/gateway/apimiddleware/process_request_test.go
+++ b/api/gateway/apimiddleware/process_request_test.go
@@ -0,0 +1,429 @@
+package apimiddleware
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/v4/api/grpc"
+	"github.com/prysmaticlabs/prysm/v4/testing/assert"
+	"github.com/prysmaticlabs/prysm/v4/testing/require"
+	"github.com/sirupsen/logrus/hooks/test"
+)
+
+type testRequestContainer struct {
+	TestString         string
+	TestHexString      string `hex:"true"`
+	TestEmptyHexString string `hex:"true"`
+	TestUint256String  string `uint256:"true"`
+}
+
+func defaultRequestContainer() *testRequestContainer {
+	return &testRequestContainer{
+		TestString:         "test string",
+		TestHexString:      "0x666F6F", // hex encoding of "foo"
+		TestEmptyHexString: "0x",
+		TestUint256String:  "4196",
+	}
+}
+
+type testResponseContainer struct {
+	TestString       string
+	TestHex          string `hex:"true"`
+	TestEmptyHex     string `hex:"true"`
+	TestAddress      string `address:"true"`
+	TestEmptyAddress string `address:"true"`
+	TestUint256      string `uint256:"true"`
+	TestEnum         string `enum:"true"`
+	TestTime         string `time:"true"`
+}
+
+func defaultResponseContainer() *testResponseContainer {
+	return &testResponseContainer{
+		TestString:       "test string",
+		TestHex:          "Zm9v", // base64 encoding of "foo"
+		TestEmptyHex:     "",
+		TestAddress:      "Zm9v",
+		TestEmptyAddress: "",
+		TestEnum:         "Test Enum",
+		TestTime:         "2006-01-02T15:04:05Z",
+
+		// base64 encoding of 4196 in little-endian
+		TestUint256: "ZBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
+	}
+}
+
+type testErrorJson struct {
+	Message     string
+	Code        int
+	CustomField string
+}
+
+// StatusCode returns the error's underlying error code.
+func (e *testErrorJson) StatusCode() int {
+	return e.Code
+}
+
+// Msg returns the error's underlying message.
+func (e *testErrorJson) Msg() string {
+	return e.Message
+}
+
+// SetCode sets the error's underlying error code.
+func (e *testErrorJson) SetCode(code int) {
+	e.Code = code
+}
+
+// SetMsg sets the error's underlying message.
+func (e *testErrorJson) SetMsg(msg string) {
+	e.Message = msg
+}
+
+func TestDeserializeRequestBodyIntoContainer(t *testing.T) {
+	t.Run("ok", func(t *testing.T) {
+		var bodyJson bytes.Buffer
+		err := json.NewEncoder(&bodyJson).Encode(defaultRequestContainer())
+		require.NoError(t, err)
+
+		container := &testRequestContainer{}
+		errJson := DeserializeRequestBodyIntoContainer(&bodyJson, container)
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, "test string", container.TestString)
+	})
+
+	t.Run("error", func(t *testing.T) {
+		var bodyJson bytes.Buffer
+		bodyJson.Write([]byte("foo"))
+		errJson := DeserializeRequestBodyIntoContainer(&bodyJson, &testRequestContainer{})
+		require.NotNil(t, errJson)
+		assert.Equal(t, true, strings.Contains(errJson.Msg(), "could not decode request body"))
+		assert.Equal(t, http.StatusInternalServerError, errJson.StatusCode())
+	})
+
+	t.Run("unknown field", func(t *testing.T) {
+		var bodyJson bytes.Buffer
+		bodyJson.Write([]byte("{\"foo\":\"foo\"}"))
+		errJson := DeserializeRequestBodyIntoContainer(&bodyJson, &testRequestContainer{})
+		require.NotNil(t, errJson)
+		assert.Equal(t, true, strings.Contains(errJson.Msg(), "could not decode request body"))
+		assert.Equal(t, http.StatusBadRequest, errJson.StatusCode())
+	})
+}
+
+func TestProcessRequestContainerFields(t *testing.T) {
+	t.Run("ok", func(t *testing.T) {
+		container := defaultRequestContainer()
+
+		errJson := ProcessRequestContainerFields(container)
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, "Zm9v", container.TestHexString)
+		assert.Equal(t, "", container.TestEmptyHexString)
+		assert.Equal(t, "ZBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=", container.TestUint256String)
+	})
+
+	t.Run("error", func(t *testing.T) {
+		errJson := ProcessRequestContainerFields("foo")
+		require.NotNil(t, errJson)
+		assert.Equal(t, true, strings.Contains(errJson.Msg(), "could not process request data"))
+		assert.Equal(t, http.StatusInternalServerError, errJson.StatusCode())
+	})
+}
+
+func TestSetRequestBodyToRequestContainer(t *testing.T) {
+	var body bytes.Buffer
+	request := httptest.NewRequest("GET", "http://foo.example", &body)
+
+	errJson := SetRequestBodyToRequestContainer(defaultRequestContainer(), request)
+	require.Equal(t, true, errJson == nil)
+	container := &testRequestContainer{}
+	require.NoError(t, json.NewDecoder(request.Body).Decode(container))
+	assert.Equal(t, "test string", container.TestString)
+	contentLengthHeader, ok := request.Header["Content-Length"]
+	require.Equal(t, true, ok)
+	require.Equal(t, 1, len(contentLengthHeader), "wrong number of header values")
+	assert.Equal(t, "108", contentLengthHeader[0])
+	assert.Equal(t, int64(108), request.ContentLength)
+}
+
+func TestPrepareRequestForProxying(t *testing.T) {
+	middleware := &ApiProxyMiddleware{
+		GatewayAddress: "http://gateway.example",
+	}
+	// We will set some params to make the request more interesting.
+	endpoint := Endpoint{
+		Path:               "/{url_param}",
+		RequestURLLiterals: []string{"url_param"},
+		RequestQueryParams: []QueryParam{{Name: "query_param"}},
+	}
+	var body bytes.Buffer
+	request := httptest.NewRequest("GET", "http://foo.example?query_param=bar", &body)
+
+	errJson := middleware.PrepareRequestForProxying(endpoint, request)
+	require.Equal(t, true, errJson == nil)
+	assert.Equal(t, "http", request.URL.Scheme)
+	assert.Equal(t, middleware.GatewayAddress, request.URL.Host)
+	assert.Equal(t, "", request.RequestURI)
+}
+
+func TestReadGrpcResponseBody(t *testing.T) {
+	var b bytes.Buffer
+	b.Write([]byte("foo"))
+
+	body, jsonErr := ReadGrpcResponseBody(&b)
+	require.Equal(t, true, jsonErr == nil)
+	assert.Equal(t, "foo", string(body))
+}
+
+func TestHandleGrpcResponseError(t *testing.T) {
+	response := &http.Response{
+		StatusCode: 400,
+		Header: http.Header{
+			"Foo": []string{"foo"},
+			"Bar": []string{"bar"},
+		},
+	}
+	writer := httptest.NewRecorder()
+	errJson := &testErrorJson{
+		Message: "foo",
+		Code:    400,
+	}
+	b, err := json.Marshal(errJson)
+	require.NoError(t, err)
+
+	hasError, e := HandleGrpcResponseError(errJson, response, b, writer)
+	require.Equal(t, true, e == nil)
+	assert.Equal(t, true, hasError)
+	v, ok := writer.Header()["Foo"]
+	require.Equal(t, true, ok, "header not found")
+	require.Equal(t, 1, len(v), "wrong number of header values")
+	assert.Equal(t, "foo", v[0])
+	v, ok = writer.Header()["Bar"]
+	require.Equal(t, true, ok, "header not found")
+	require.Equal(t, 1, len(v), "wrong number of header values")
+	assert.Equal(t, "bar", v[0])
+	assert.Equal(t, 400, errJson.StatusCode())
+}
+
+func TestGrpcResponseIsEmpty(t *testing.T) {
+	t.Run("nil", func(t *testing.T) {
+		assert.Equal(t, true, GrpcResponseIsEmpty(nil))
+	})
+	t.Run("empty_slice", func(t *testing.T) {
+		assert.Equal(t, true, GrpcResponseIsEmpty(make([]byte, 0)))
+	})
+	t.Run("empty_brackets", func(t *testing.T) {
+		assert.Equal(t, true, GrpcResponseIsEmpty([]byte("{}")))
+	})
+	t.Run("non_empty", func(t *testing.T) {
+		assert.Equal(t, false, GrpcResponseIsEmpty([]byte("{\"foo\":\"bar\"})")))
+	})
+}
+
+func TestDeserializeGrpcResponseBodyIntoContainer(t *testing.T) {
+	t.Run("ok", func(t *testing.T) {
+		body, err := json.Marshal(defaultRequestContainer())
+		require.NoError(t, err)
+
+		container := &testRequestContainer{}
+		errJson := DeserializeGrpcResponseBodyIntoContainer(body, container)
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, "test string", container.TestString)
+	})
+
+	t.Run("error", func(t *testing.T) {
+		var bodyJson bytes.Buffer
+		bodyJson.Write([]byte("foo"))
+		errJson := DeserializeGrpcResponseBodyIntoContainer(bodyJson.Bytes(), &testRequestContainer{})
+		require.NotNil(t, errJson)
+		assert.Equal(t, true, strings.Contains(errJson.Msg(), "could not unmarshal response"))
+		assert.Equal(t, http.StatusInternalServerError, errJson.StatusCode())
+	})
+}
+
+func TestProcessMiddlewareResponseFields(t *testing.T) {
+	t.Run("Ok", func(t *testing.T) {
+		container := defaultResponseContainer()
+
+		errJson := ProcessMiddlewareResponseFields(container)
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, "0x666f6f", container.TestHex)
+		assert.Equal(t, "0x", container.TestEmptyHex)
+		assert.Equal(t, "0x0000000000000000000000000000000000666F6f", container.TestAddress)
+		assert.Equal(t, "0x", container.TestEmptyAddress)
+		assert.Equal(t, "4196", container.TestUint256)
+		assert.Equal(t, "test enum", container.TestEnum)
+		assert.Equal(t, "1136214245", container.TestTime)
+	})
+
+	t.Run("error", func(t *testing.T) {
+		errJson := ProcessMiddlewareResponseFields("foo")
+		require.NotNil(t, errJson)
+		assert.Equal(t, true, strings.Contains(errJson.Msg(), "could not process response data"))
+		assert.Equal(t, http.StatusInternalServerError, errJson.StatusCode())
+	})
+}
+
+func TestSerializeMiddlewareResponseIntoJson(t *testing.T) {
+	container := defaultResponseContainer()
+	j, errJson := SerializeMiddlewareResponseIntoJson(container)
+	assert.Equal(t, true, errJson == nil)
+	cToDeserialize := &testResponseContainer{}
+	require.NoError(t, json.Unmarshal(j, cToDeserialize))
+	assert.Equal(t, "test string", cToDeserialize.TestString)
+}
+
+func TestWriteMiddlewareResponseHeadersAndBody(t *testing.T) {
+	t.Run("GET", func(t *testing.T) {
+		response := &http.Response{
+			Header: http.Header{
+				"Foo": []string{"foo"},
+				"Grpc-Metadata-" + grpc.HttpCodeMetadataKey: []string{"204"},
+			},
+		}
+		container := defaultResponseContainer()
+		responseJson, err := json.Marshal(container)
+		require.NoError(t, err)
+		writer := httptest.NewRecorder()
+		writer.Body = &bytes.Buffer{}
+
+		errJson := WriteMiddlewareResponseHeadersAndBody(response, responseJson, writer)
+		require.Equal(t, true, errJson == nil)
+		v, ok := writer.Header()["Foo"]
+		require.Equal(t, true, ok, "header not found")
+		require.Equal(t, 1, len(v), "wrong number of header values")
+		assert.Equal(t, "foo", v[0])
+		v, ok = writer.Header()["Content-Length"]
+		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])
+		assert.Equal(t, 204, writer.Code)
+		assert.DeepEqual(t, responseJson, writer.Body.Bytes())
+	})
+
+	t.Run("GET_no_grpc_status_code_header", func(t *testing.T) {
+		response := &http.Response{
+			Header:     http.Header{},
+			StatusCode: 204,
+		}
+		container := defaultResponseContainer()
+		responseJson, err := json.Marshal(container)
+		require.NoError(t, err)
+		writer := httptest.NewRecorder()
+
+		errJson := WriteMiddlewareResponseHeadersAndBody(response, responseJson, writer)
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, 204, writer.Code)
+	})
+
+	t.Run("GET_invalid_status_code", func(t *testing.T) {
+		response := &http.Response{
+			Header: http.Header{},
+		}
+
+		// Set invalid status code.
+		response.Header["Grpc-Metadata-"+grpc.HttpCodeMetadataKey] = []string{"invalid"}
+
+		container := defaultResponseContainer()
+		responseJson, err := json.Marshal(container)
+		require.NoError(t, err)
+		writer := httptest.NewRecorder()
+
+		errJson := WriteMiddlewareResponseHeadersAndBody(response, responseJson, writer)
+		require.Equal(t, false, errJson == nil)
+		assert.Equal(t, true, strings.Contains(errJson.Msg(), "could not parse status code"))
+		assert.Equal(t, http.StatusInternalServerError, errJson.StatusCode())
+	})
+
+	t.Run("POST", func(t *testing.T) {
+		response := &http.Response{
+			Header:     http.Header{},
+			StatusCode: 204,
+		}
+		container := defaultResponseContainer()
+		responseJson, err := json.Marshal(container)
+		require.NoError(t, err)
+		writer := httptest.NewRecorder()
+
+		errJson := WriteMiddlewareResponseHeadersAndBody(response, responseJson, writer)
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, 204, writer.Code)
+	})
+
+	t.Run("POST_with_response_body", func(t *testing.T) {
+		response := &http.Response{
+			Header:     http.Header{},
+			StatusCode: 204,
+		}
+		container := defaultResponseContainer()
+		responseJson, err := json.Marshal(container)
+		require.NoError(t, err)
+		writer := httptest.NewRecorder()
+		writer.Body = &bytes.Buffer{}
+
+		errJson := WriteMiddlewareResponseHeadersAndBody(response, responseJson, writer)
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, 204, writer.Code)
+		assert.DeepEqual(t, responseJson, writer.Body.Bytes())
+	})
+
+	t.Run("POST_with_empty_json_body", func(t *testing.T) {
+		response := &http.Response{
+			Header:     http.Header{},
+			StatusCode: 204,
+		}
+		responseJson, err := json.Marshal(struct{}{})
+		require.NoError(t, err)
+		writer := httptest.NewRecorder()
+		writer.Body = &bytes.Buffer{}
+
+		errJson := WriteMiddlewareResponseHeadersAndBody(response, responseJson, writer)
+		require.Equal(t, true, errJson == nil)
+		assert.Equal(t, 204, writer.Code)
+		assert.DeepEqual(t, []byte(nil), writer.Body.Bytes())
+		assert.Equal(t, "0", writer.Header()["Content-Length"][0])
+	})
+}
+
+func TestWriteError(t *testing.T) {
+	t.Run("ok", func(t *testing.T) {
+		responseHeader := http.Header{
+			"Grpc-Metadata-" + grpc.CustomErrorMetadataKey: []string{"{\"CustomField\":\"bar\"}"},
+		}
+		errJson := &testErrorJson{
+			Message: "foo",
+			Code:    500,
+		}
+		writer := httptest.NewRecorder()
+		writer.Body = &bytes.Buffer{}
+
+		WriteError(writer, errJson, responseHeader)
+		v, ok := writer.Header()["Content-Length"]
+		require.Equal(t, true, ok, "header not found")
+		require.Equal(t, 1, len(v), "wrong number of header values")
+		assert.Equal(t, "48", v[0])
+		v, ok = writer.Header()["Content-Type"]
+		require.Equal(t, true, ok, "header not found")
+		require.Equal(t, 1, len(v), "wrong number of header values")
+		assert.Equal(t, "application/json", v[0])
+		assert.Equal(t, 500, writer.Code)
+		eDeserialize := &testErrorJson{}
+		require.NoError(t, json.Unmarshal(writer.Body.Bytes(), eDeserialize))
+		assert.Equal(t, "foo", eDeserialize.Message)
+		assert.Equal(t, 500, eDeserialize.Code)
+		assert.Equal(t, "bar", eDeserialize.CustomField)
+	})
+
+	t.Run("invalid_custom_error_header", func(t *testing.T) {
+		logHook := test.NewGlobal()
+
+		responseHeader := http.Header{
+			"Grpc-Metadata-" + grpc.CustomErrorMetadataKey: []string{"invalid"},
+		}
+
+		WriteError(httptest.NewRecorder(), &testErrorJson{}, responseHeader)
+		assert.LogsContain(t, logHook, "Could not unmarshal custom error message")
+	})
+}
--- a/api/gateway/apimiddleware/structs.go
+++ b/api/gateway/apimiddleware/structs.go
@@ -0,0 +1,69 @@
+package apimiddleware
+
+import (
+	"net/http"
+
+	"github.com/pkg/errors"
+)
+
+// ---------------
+// Error handling.
+// ---------------
+
+// ErrorJson describes common functionality of all JSON error representations.
+type ErrorJson interface {
+	StatusCode() int
+	SetCode(code int)
+	Msg() string
+	SetMsg(msg string)
+}
+
+// DefaultErrorJson is a JSON representation of a simple error value, containing only a message and an error code.
+type DefaultErrorJson struct {
+	Message string `json:"message"`
+	Code    int    `json:"code"`
+}
+
+// InternalServerErrorWithMessage returns a DefaultErrorJson with 500 code and a custom message.
+func InternalServerErrorWithMessage(err error, message string) *DefaultErrorJson {
+	e := errors.Wrapf(err, message)
+	return &DefaultErrorJson{
+		Message: e.Error(),
+		Code:    http.StatusInternalServerError,
+	}
+}
+
+// InternalServerError returns a DefaultErrorJson with 500 code.
+func InternalServerError(err error) *DefaultErrorJson {
+	return &DefaultErrorJson{
+		Message: err.Error(),
+		Code:    http.StatusInternalServerError,
+	}
+}
+
+func TimeoutError() *DefaultErrorJson {
+	return &DefaultErrorJson{
+		Message: "Request timeout",
+		Code:    http.StatusRequestTimeout,
+	}
+}
+
+// StatusCode returns the error's underlying error code.
+func (e *DefaultErrorJson) StatusCode() int {
+	return e.Code
+}
+
+// Msg returns the error's underlying message.
+func (e *DefaultErrorJson) Msg() string {
+	return e.Message
+}
+
+// SetCode sets the error's underlying error code.
+func (e *DefaultErrorJson) SetCode(code int) {
+	e.Code = code
+}
+
+// SetMsg sets the error's underlying message.
+func (e *DefaultErrorJson) SetMsg(msg string) {
+	e.Message = msg
+}
--- a/api/gateway/gateway.go
+++ b/api/gateway/gateway.go
@@ -6,17 +6,19 @@ import (
 	"fmt"
 	"net"
 	"net/http"
+	"path"
+	"strings"
 	"time"

 	"github.com/gorilla/mux"
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
 	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v4/api/server"
+	"github.com/prysmaticlabs/prysm/v4/api/gateway/apimiddleware"
 	"github.com/prysmaticlabs/prysm/v4/runtime"
+	"github.com/rs/cors"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/credentials/insecure"
 )

 var _ runtime.Service = (*Gateway)(nil)
@@ -33,6 +35,7 @@ type PbHandlerRegistration func(context.Context, *gwruntime.ServeMux, *grpc.Clie

 // MuxHandler is a function that implements the mux handler functionality.
 type MuxHandler func(
+	apiMiddlewareHandler *apimiddleware.ApiProxyMiddleware,
 	h http.HandlerFunc,
 	w http.ResponseWriter,
 	req *http.Request,
@@ -40,15 +43,16 @@ type MuxHandler func(

 // Config parameters for setting up the gateway service.
 type config struct {
-	maxCallRecvMsgSize uint64
-	remoteCert         string
-	gatewayAddr        string
-	remoteAddr         string
-	allowedOrigins     []string
-	muxHandler         MuxHandler
-	pbHandlers         []*PbMux
-	router             *mux.Router
-	timeout            time.Duration
+	maxCallRecvMsgSize           uint64
+	remoteCert                   string
+	gatewayAddr                  string
+	remoteAddr                   string
+	allowedOrigins               []string
+	apiMiddlewareEndpointFactory apimiddleware.EndpointFactory
+	muxHandler                   MuxHandler
+	pbHandlers                   []*PbMux
+	router                       *mux.Router
+	timeout                      time.Duration
 }

 // Gateway is the gRPC gateway to serve HTTP JSON traffic as a proxy and forward it to the gRPC server.
@@ -57,6 +61,7 @@ type Gateway struct {
 	conn         *grpc.ClientConn
 	server       *http.Server
 	cancel       context.CancelFunc
+	proxy        *apimiddleware.ApiProxyMiddleware
 	ctx          context.Context
 	startFailure error
 }
@@ -104,11 +109,15 @@ func (g *Gateway) Start() {
 		}
 	}

-	corsMux := server.CorsHandler(g.cfg.allowedOrigins).Middleware(g.cfg.router)
+	corsMux := g.corsMiddleware(g.cfg.router)
+
+	if g.cfg.apiMiddlewareEndpointFactory != nil && !g.cfg.apiMiddlewareEndpointFactory.IsNil() {
+		g.registerApiMiddleware()
+	}

 	if g.cfg.muxHandler != nil {
 		g.cfg.router.PathPrefix("/").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-			g.cfg.muxHandler(corsMux.ServeHTTP, w, r)
+			g.cfg.muxHandler(g.proxy, corsMux.ServeHTTP, w, r)
 		})
 	}

@@ -158,6 +167,35 @@ func (g *Gateway) Stop() error {
 	return nil
 }

+func (g *Gateway) corsMiddleware(h http.Handler) http.Handler {
+	c := cors.New(cors.Options{
+		AllowedOrigins:   g.cfg.allowedOrigins,
+		AllowedMethods:   []string{http.MethodPost, http.MethodGet, http.MethodDelete, http.MethodOptions},
+		AllowCredentials: true,
+		MaxAge:           600,
+		AllowedHeaders:   []string{"*"},
+	})
+	return c.Handler(h)
+}
+
+const swaggerDir = "proto/prysm/v1alpha1/"
+
+// SwaggerServer returns swagger specification files located under "/swagger/"
+func SwaggerServer() http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if !strings.HasSuffix(r.URL.Path, ".swagger.json") {
+			log.Debugf("Not found: %s", r.URL.Path)
+			http.NotFound(w, r)
+			return
+		}
+
+		log.Debugf("Serving %s\n", r.URL.Path)
+		p := strings.TrimPrefix(r.URL.Path, "/swagger/")
+		p = path.Join(swaggerDir, p)
+		http.ServeFile(w, r, p)
+	}
+}
+
 // dial the gRPC server.
 func (g *Gateway) dial(ctx context.Context, network, addr string) (*grpc.ClientConn, error) {
 	switch network {
@@ -173,21 +211,19 @@ func (g *Gateway) dial(ctx context.Context, network, addr string) (*grpc.ClientC
 // dialTCP creates a client connection via TCP.
 // "addr" must be a valid TCP address with a port number.
 func (g *Gateway) dialTCP(ctx context.Context, addr string) (*grpc.ClientConn, error) {
-	var security grpc.DialOption
+	security := grpc.WithInsecure()
 	if len(g.cfg.remoteCert) > 0 {
 		creds, err := credentials.NewClientTLSFromFile(g.cfg.remoteCert, "")
 		if err != nil {
 			return nil, err
 		}
 		security = grpc.WithTransportCredentials(creds)
-	} else {
-		// Use insecure credentials when there's no remote cert provided.
-		security = grpc.WithTransportCredentials(insecure.NewCredentials())
 	}
 	opts := []grpc.DialOption{
 		security,
 		grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(int(g.cfg.maxCallRecvMsgSize))),
 	}
+
 	return grpc.DialContext(ctx, addr, opts...)
 }

@@ -204,9 +240,19 @@ func (g *Gateway) dialUnix(ctx context.Context, addr string) (*grpc.ClientConn,
 		return d(addr, 0)
 	}
 	opts := []grpc.DialOption{
-		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithInsecure(),
 		grpc.WithContextDialer(f),
 		grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(int(g.cfg.maxCallRecvMsgSize))),
 	}
 	return grpc.DialContext(ctx, addr, opts...)
 }
+
+func (g *Gateway) registerApiMiddleware() {
+	g.proxy = &apimiddleware.ApiProxyMiddleware{
+		GatewayAddress:  g.cfg.gatewayAddr,
+		EndpointCreator: g.cfg.apiMiddlewareEndpointFactory,
+		Timeout:         g.cfg.timeout,
+	}
+	log.Info("Starting API middleware")
+	g.proxy.Run(g.cfg.router)
+}
--- a/api/gateway/gateway_test.go
+++ b/api/gateway/gateway_test.go
@@ -10,6 +10,7 @@ import (
 	"testing"

 	"github.com/gorilla/mux"
+	"github.com/prysmaticlabs/prysm/v4/api/gateway/apimiddleware"
 	"github.com/prysmaticlabs/prysm/v4/cmd/beacon-chain/flags"
 	"github.com/prysmaticlabs/prysm/v4/testing/assert"
 	"github.com/prysmaticlabs/prysm/v4/testing/require"
@@ -17,18 +18,36 @@ import (
 	"github.com/urfave/cli/v2"
 )

+type mockEndpointFactory struct {
+}
+
+func (*mockEndpointFactory) Paths() []string {
+	return []string{}
+}
+
+func (*mockEndpointFactory) Create(_ string) (*apimiddleware.Endpoint, error) {
+	return nil, nil
+}
+
+func (*mockEndpointFactory) IsNil() bool {
+	return false
+}
+
 func TestGateway_Customized(t *testing.T) {
 	r := mux.NewRouter()
 	cert := "cert"
 	origins := []string{"origin"}
 	size := uint64(100)
+	endpointFactory := &mockEndpointFactory{}

 	opts := []Option{
 		WithRouter(r),
 		WithRemoteCert(cert),
 		WithAllowedOrigins(origins),
 		WithMaxCallRecvMsgSize(size),
+		WithApiMiddleware(endpointFactory),
 		WithMuxHandler(func(
+			_ *apimiddleware.ApiProxyMiddleware,
 			_ http.HandlerFunc,
 			_ http.ResponseWriter,
 			_ *http.Request,
@@ -44,6 +63,7 @@ func TestGateway_Customized(t *testing.T) {
 	require.Equal(t, 1, len(g.cfg.allowedOrigins))
 	assert.Equal(t, origins[0], g.cfg.allowedOrigins[0])
 	assert.Equal(t, size, g.cfg.maxCallRecvMsgSize)
+	assert.Equal(t, endpointFactory, g.cfg.apiMiddlewareEndpointFactory)
 }

 func TestGateway_StartStop(t *testing.T) {
@@ -63,6 +83,7 @@ func TestGateway_StartStop(t *testing.T) {
 		WithGatewayAddr(gatewayAddress),
 		WithRemoteAddr(selfAddress),
 		WithMuxHandler(func(
+			_ *apimiddleware.ApiProxyMiddleware,
 			_ http.HandlerFunc,
 			_ http.ResponseWriter,
 			_ *http.Request,
--- a/api/gateway/options.go
+++ b/api/gateway/options.go
@@ -5,6 +5,7 @@ import (

 	"github.com/gorilla/mux"
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"github.com/prysmaticlabs/prysm/v4/api/gateway/apimiddleware"
 )

 type Option func(g *Gateway) error
@@ -69,6 +70,14 @@ func WithMaxCallRecvMsgSize(size uint64) Option {
 	}
 }

+// WithApiMiddleware allows adding an API middleware proxy to the gateway.
+func WithApiMiddleware(endpointFactory apimiddleware.EndpointFactory) Option {
+	return func(g *Gateway) error {
+		g.cfg.apiMiddlewareEndpointFactory = endpointFactory
+		return nil
+	}
+}
+
 // WithTimeout allows changing the timeout value for API calls.
 func WithTimeout(seconds uint64) Option {
 	return func(g *Gateway) error {
--- 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
@@ -1,12 +0,0 @@
-package api
-
-const (
-	VersionHeader                 = "Eth-Consensus-Version"
-	ExecutionPayloadBlindedHeader = "Eth-Execution-Payload-Blinded"
-	ExecutionPayloadValueHeader   = "Eth-Execution-Payload-Value"
-	ConsensusBlockValueHeader     = "Eth-Consensus-Block-Value"
-	JsonMediaType                 = "application/json"
-	OctetStreamMediaType          = "application/octet-stream"
-	EventStreamMediaType          = "text/event-stream"
-	KeepAlive                     = "keep-alive"
-)
--- a/api/pagination/pagination.go
+++ b/api/pagination/pagination.go
@@ -15,9 +15,6 @@ func StartAndEndPage(pageToken string, pageSize, totalSize int) (int, int, strin
 	if pageToken == "" {
 		pageToken = "0"
 	}
-	if pageSize < 0 || totalSize < 0 {
-		return 0, 0, "", errors.Errorf("invalid page and total sizes provided: page size %d , total size %d", pageSize, totalSize)
-	}
 	if pageSize == 0 {
 		pageSize = params.BeaconConfig().DefaultPageSize
 	}
@@ -26,9 +23,6 @@ func StartAndEndPage(pageToken string, pageSize, totalSize int) (int, int, strin
 	if err != nil {
 		return 0, 0, "", errors.Wrap(err, "could not convert page token")
 	}
-	if token < 0 {
-		return 0, 0, "", errors.Errorf("invalid token value provided: %d", token)
-	}

 	// Start page can not be greater than set size.
 	start := token * pageSize
--- a/api/pagination/pagination_test.go
+++ b/api/pagination/pagination_test.go
@@ -85,19 +85,3 @@ func TestStartAndEndPage_ExceedsMaxPage(t *testing.T) {
 	_, _, _, err := pagination.StartAndEndPage("", 0, 0)
 	assert.ErrorContains(t, wanted, err)
 }
-
-func TestStartAndEndPage_InvalidPageValues(t *testing.T) {
-	_, _, _, err := pagination.StartAndEndPage("10", -1, 10)
-	assert.ErrorContains(t, "invalid page and total sizes provided", err)
-
-	_, _, _, err = pagination.StartAndEndPage("12", 10, -10)
-	assert.ErrorContains(t, "invalid page and total sizes provided", err)
-
-	_, _, _, err = pagination.StartAndEndPage("12", -50, -60)
-	assert.ErrorContains(t, "invalid page and total sizes provided", err)
-}
-
-func TestStartAndEndPage_InvalidTokenValue(t *testing.T) {
-	_, _, _, err := pagination.StartAndEndPage("-12", 50, 60)
-	assert.ErrorContains(t, "invalid token value provided", err)
-}
--- a/api/server/BUILD.bazel
+++ b/api/server/BUILD.bazel
@@ -1,30 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library", "go_test")
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "error.go",
-        "middleware.go",
-        "util.go",
-    ],
-    importpath = "github.com/prysmaticlabs/prysm/v4/api/server",
-    visibility = ["//visibility:public"],
-    deps = [
-        "@com_github_gorilla_mux//:go_default_library",
-        "@com_github_rs_cors//:go_default_library",
-    ],
-)
-
-go_test(
-    name = "go_default_test",
-    srcs = [
-        "error_test.go",
-        "middleware_test.go",
-        "util_test.go",
-    ],
-    embed = [":go_default_library"],
-    deps = [
-        "//testing/assert:go_default_library",
-        "//testing/require:go_default_library",
-    ],
-)
--- a/api/server/error.go
+++ b/api/server/error.go
@@ -1,45 +0,0 @@
-package server
-
-import (
-	"fmt"
-	"strings"
-)
-
-// DecodeError represents an error resulting from trying to decode an HTTP request.
-// It tracks the full field name for which decoding failed.
-type DecodeError struct {
-	path []string
-	err  error
-}
-
-// NewDecodeError wraps an error (either the initial decoding error or another DecodeError).
-// The current field that failed decoding must be passed in.
-func NewDecodeError(err error, field string) *DecodeError {
-	de, ok := err.(*DecodeError)
-	if ok {
-		return &DecodeError{path: append([]string{field}, de.path...), err: de.err}
-	}
-	return &DecodeError{path: []string{field}, err: err}
-}
-
-// Error returns the formatted error message which contains the full field name and the actual decoding error.
-func (e *DecodeError) Error() string {
-	return fmt.Sprintf("could not decode %s: %s", strings.Join(e.path, "."), e.err.Error())
-}
-
-// IndexedVerificationFailureError wraps a collection of verification failures.
-type IndexedVerificationFailureError struct {
-	Message  string                        `json:"message"`
-	Code     int                           `json:"code"`
-	Failures []*IndexedVerificationFailure `json:"failures"`
-}
-
-func (e *IndexedVerificationFailureError) StatusCode() int {
-	return e.Code
-}
-
-// IndexedVerificationFailure represents an issue when verifying a single indexed object e.g. an item in an array.
-type IndexedVerificationFailure struct {
-	Index   int    `json:"index"`
-	Message string `json:"message"`
-}
--- a/api/server/error_test.go
+++ b/api/server/error_test.go
@@ -1,16 +0,0 @@
-package server
-
-import (
-	"errors"
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v4/testing/assert"
-)
-
-func TestDecodeError(t *testing.T) {
-	e := errors.New("not a number")
-	de := NewDecodeError(e, "Z")
-	de = NewDecodeError(de, "Y")
-	de = NewDecodeError(de, "X")
-	assert.Equal(t, "could not decode X.Y.Z: not a number", de.Error())
-}
--- a/api/server/middleware.go
+++ b/api/server/middleware.go
@@ -1,32 +0,0 @@
-package server
-
-import (
-	"net/http"
-
-	"github.com/gorilla/mux"
-	"github.com/rs/cors"
-)
-
-// NormalizeQueryValuesHandler normalizes an input query of "key=value1,value2,value3" to "key=value1&key=value2&key=value3"
-func NormalizeQueryValuesHandler(next http.Handler) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		query := r.URL.Query()
-		NormalizeQueryValues(query)
-		r.URL.RawQuery = query.Encode()
-
-		next.ServeHTTP(w, r)
-	})
-}
-
-// CorsHandler sets the cors settings on api endpoints
-func CorsHandler(allowOrigins []string) mux.MiddlewareFunc {
-	c := cors.New(cors.Options{
-		AllowedOrigins:   allowOrigins,
-		AllowedMethods:   []string{http.MethodPost, http.MethodGet, http.MethodDelete, http.MethodOptions},
-		AllowCredentials: true,
-		MaxAge:           600,
-		AllowedHeaders:   []string{"*"},
-	})
-
-	return c.Handler
-}
--- a/api/server/middleware_test.go
+++ b/api/server/middleware_test.go
@@ -1,54 +0,0 @@
-package server
-
-import (
-	"net/http"
-	"net/http/httptest"
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v4/testing/require"
-)
-
-func TestNormalizeQueryValuesHandler(t *testing.T) {
-	nextHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		_, err := w.Write([]byte("next handler"))
-		require.NoError(t, err)
-	})
-
-	handler := NormalizeQueryValuesHandler(nextHandler)
-
-	tests := []struct {
-		name          string
-		inputQuery    string
-		expectedQuery string
-	}{
-		{
-			name:          "3 values",
-			inputQuery:    "key=value1,value2,value3",
-			expectedQuery: "key=value1&key=value2&key=value3", // replace with expected normalized value
-		},
-	}
-
-	for _, test := range tests {
-		t.Run(test.name, func(t *testing.T) {
-			req, err := http.NewRequest("GET", "/test?"+test.inputQuery, nil)
-			if err != nil {
-				t.Fatal(err)
-			}
-
-			rr := httptest.NewRecorder()
-			handler.ServeHTTP(rr, req)
-
-			if rr.Code != http.StatusOK {
-				t.Errorf("handler returned wrong status code: got %v want %v", rr.Code, http.StatusOK)
-			}
-
-			if req.URL.RawQuery != test.expectedQuery {
-				t.Errorf("query not normalized: got %v want %v", req.URL.RawQuery, test.expectedQuery)
-			}
-
-			if rr.Body.String() != "next handler" {
-				t.Errorf("next handler was not executed")
-			}
-		})
-	}
-}
--- a/api/server/util.go
+++ b/api/server/util.go
@@ -1,17 +0,0 @@
-package server
-
-import (
-	"net/url"
-	"strings"
-)
-
-// NormalizeQueryValues replaces comma-separated values with individual values
-func NormalizeQueryValues(queryParams url.Values) {
-	for key, vals := range queryParams {
-		splitVals := make([]string, 0)
-		for _, v := range vals {
-			splitVals = append(splitVals, strings.Split(v, ",")...)
-		}
-		queryParams[key] = splitVals
-	}
-}
--- a/api/server/util_test.go
+++ b/api/server/util_test.go
@@ -1,21 +0,0 @@
-package server
-
-import (
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v4/testing/assert"
-	"github.com/prysmaticlabs/prysm/v4/testing/require"
-)
-
-func TestNormalizeQueryValues(t *testing.T) {
-	input := make(map[string][]string)
-	input["key"] = []string{"value1", "value2,value3,value4", "value5"}
-
-	NormalizeQueryValues(input)
-	require.Equal(t, 5, len(input["key"]))
-	assert.Equal(t, "value1", input["key"][0])
-	assert.Equal(t, "value2", input["key"][1])
-	assert.Equal(t, "value3", input["key"][2])
-	assert.Equal(t, "value4", input["key"][3])
-	assert.Equal(t, "value5", input["key"][4])
-}
--- 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/BUILD.bazel
+++ b/beacon-chain/BUILD.bazel
@@ -0,0 +1,19 @@
+load("//tools:target_migration.bzl", "moved_targets")
+
+moved_targets(
+    [
+        ":push_images_debug",
+        ":push_images_alpine",
+        ":push_images",
+        ":image_bundle_debug",
+        ":image_debug",
+        ":image_bundle_alpine",
+        ":image_bundle",
+        ":image_with_creation_time",
+        ":image_alpine",
+        ":image",
+        ":go_default_test",
+        ":beacon-chain",
+    ],
+    "//cmd/beacon-chain",
+)
--- a/beacon-chain/blockchain/BUILD.bazel
+++ b/beacon-chain/blockchain/BUILD.bazel
@@ -5,15 +5,12 @@ go_library(
    srcs = [
        "chain_info.go",
        "chain_info_forkchoice.go",
-        "currently_syncing_block.go",
-        "defragment.go",
        "error.go",
        "execution_engine.go",
        "forkchoice_update_execution.go",
        "head.go",
        "head_sync_committee_info.go",
        "init_sync_process_block.go",
-        "lightclient.go",
        "log.go",
        "merge_ascii_art.go",
        "metrics.go",
@@ -24,10 +21,8 @@ go_library(
        "process_block.go",
        "process_block_helpers.go",
        "receive_attestation.go",
-        "receive_blob.go",
        "receive_block.go",
        "service.go",
-        "tracked_proposer.go",
        "weak_subjectivity_checks.go",
    ],
    importpath = "github.com/prysmaticlabs/prysm/v4/beacon-chain/blockchain",
@@ -40,8 +35,8 @@ go_library(
    deps = [
        "//async:go_default_library",
        "//async/event:go_default_library",
-        "//beacon-chain/blockchain/kzg:go_default_library",
        "//beacon-chain/cache:go_default_library",
+        "//beacon-chain/cache/depositcache:go_default_library",
        "//beacon-chain/core/altair:go_default_library",
        "//beacon-chain/core/blocks:go_default_library",
        "//beacon-chain/core/epoch/precompute:go_default_library",
@@ -51,10 +46,9 @@ go_library(
        "//beacon-chain/core/signing:go_default_library",
        "//beacon-chain/core/time:go_default_library",
        "//beacon-chain/core/transition:go_default_library",
-        "//beacon-chain/das:go_default_library",
        "//beacon-chain/db:go_default_library",
-        "//beacon-chain/db/filesystem:go_default_library",
        "//beacon-chain/db/filters:go_default_library",
+        "//beacon-chain/db/kv:go_default_library",
        "//beacon-chain/execution:go_default_library",
        "//beacon-chain/forkchoice:go_default_library",
        "//beacon-chain/forkchoice/doubly-linked-tree:go_default_library",
@@ -72,7 +66,6 @@ go_library(
        "//config/params:go_default_library",
        "//consensus-types:go_default_library",
        "//consensus-types/blocks:go_default_library",
-        "//consensus-types/forkchoice:go_default_library",
        "//consensus-types/interfaces:go_default_library",
        "//consensus-types/payload-attribute:go_default_library",
        "//consensus-types/primitives:go_default_library",
@@ -82,8 +75,6 @@ go_library(
        "//monitoring/tracing:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/eth/v1:go_default_library",
-        "//proto/eth/v2:go_default_library",
-        "//proto/migration:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//proto/prysm/v1alpha1/attestation:go_default_library",
        "//runtime/version:go_default_library",
@@ -97,26 +88,29 @@ go_library(
        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@io_opencensus_go//trace:go_default_library",
-        "@org_golang_x_sync//errgroup:go_default_library",
+    ],
+)
+
+test_suite(
+    name = "go_default_test",
+    tests = [
+        ":go_raceoff_test",
+        ":go_raceon_test",
    ],
 )

 go_test(
-    name = "go_default_test",
+    name = "go_raceoff_test",
    size = "medium",
    srcs = [
        "blockchain_test.go",
-        "chain_info_norace_test.go",
        "chain_info_test.go",
        "checktags_test.go",
-        "error_test.go",
        "execution_engine_test.go",
        "forkchoice_update_execution_test.go",
        "head_sync_committee_info_test.go",
        "head_test.go",
-        "init_sync_process_block_test.go",
        "init_test.go",
-        "lightclient_test.go",
        "log_test.go",
        "metrics_test.go",
        "mock_test.go",
@@ -125,67 +119,98 @@ go_test(
        "process_block_test.go",
        "receive_attestation_test.go",
        "receive_block_test.go",
-        "service_norace_test.go",
        "service_test.go",
        "setup_test.go",
        "weak_subjectivity_checks_test.go",
    ],
    embed = [":go_default_library"],
    gotags = ["develop"],
-    tags = ["CI_race_detection"],
    deps = [
        "//async/event:go_default_library",
        "//beacon-chain/blockchain/testing:go_default_library",
-        "//beacon-chain/cache:go_default_library",
        "//beacon-chain/cache/depositcache:go_default_library",
        "//beacon-chain/core/blocks:go_default_library",
-        "//beacon-chain/core/feed/state:go_default_library",
        "//beacon-chain/core/helpers:go_default_library",
-        "//beacon-chain/core/signing:go_default_library",
        "//beacon-chain/core/transition:go_default_library",
-        "//beacon-chain/das:go_default_library",
        "//beacon-chain/db:go_default_library",
-        "//beacon-chain/db/filesystem:go_default_library",
        "//beacon-chain/db/testing:go_default_library",
        "//beacon-chain/execution:go_default_library",
        "//beacon-chain/execution/testing:go_default_library",
-        "//beacon-chain/forkchoice:go_default_library",
-        "//beacon-chain/forkchoice/doubly-linked-tree:go_default_library",
        "//beacon-chain/forkchoice/types:go_default_library",
-        "//beacon-chain/operations/attestations:go_default_library",
-        "//beacon-chain/operations/blstoexec:go_default_library",
-        "//beacon-chain/operations/slashings:go_default_library",
-        "//beacon-chain/operations/voluntaryexits:go_default_library",
        "//beacon-chain/p2p:go_default_library",
-        "//beacon-chain/startup:go_default_library",
-        "//beacon-chain/state:go_default_library",
        "//beacon-chain/state/state-native:go_default_library",
-        "//beacon-chain/state/stategen:go_default_library",
-        "//config/features:go_default_library",
+        "//beacon-chain/state/stateutil:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/blocks:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
-        "//consensus-types/primitives:go_default_library",
+        "//consensus-types/blocks/testing:go_default_library",
        "//container/trie:go_default_library",
-        "//crypto/bls:go_default_library",
        "//encoding/bytesutil:go_default_library",
-        "//proto/engine/v1:go_default_library",
-        "//proto/eth/v1:go_default_library",
-        "//proto/eth/v2:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
-        "//runtime/version:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
        "//testing/util:go_default_library",
-        "//time:go_default_library",
-        "//time/slots:go_default_library",
+        "@com_github_ethereum_go_ethereum//:go_default_library",
+        "@com_github_ethereum_go_ethereum//common:go_default_library",
+        "@com_github_ethereum_go_ethereum//core/types:go_default_library",
+        "@com_github_sirupsen_logrus//:go_default_library",
+        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
+        "@in_gopkg_d4l3k_messagediff_v1//:go_default_library",
+        "@org_golang_google_protobuf//proto:go_default_library",
+        "@org_golang_x_net//context:go_default_library",
+    ],
+)
+
+go_test(
+    name = "go_raceon_test",
+    srcs = [
+        "chain_info_norace_test.go",
+        "checktags_test.go",
+        "init_test.go",
+        "mock_test.go",
+        "receive_block_test.go",
+        "service_norace_test.go",
+        "setup_test.go",
+    ],
+    embed = [":go_default_library"],
+    gc_goopts = [
+        # Go 1.14 enables checkptr by default when building with -race or -msan. There is a pointer
+        # issue in boltdb, so must disable checkptr at compile time. This flag can be removed once
+        # the project is migrated to etcd's version of boltdb and the issue has been fixed.
+        # See: https://github.com/etcd-io/bbolt/issues/187.
+        "-d=checkptr=0",
+    ],
+    gotags = ["develop"],
+    race = "on",
+    tags = ["race_on"],
+    deps = [
+        "//async/event:go_default_library",
+        "//beacon-chain/blockchain/testing:go_default_library",
+        "//beacon-chain/cache/depositcache:go_default_library",
+        "//beacon-chain/core/blocks:go_default_library",
+        "//beacon-chain/core/helpers:go_default_library",
+        "//beacon-chain/core/transition:go_default_library",
+        "//beacon-chain/db:go_default_library",
+        "//beacon-chain/db/testing:go_default_library",
+        "//beacon-chain/execution:go_default_library",
+        "//beacon-chain/execution/testing:go_default_library",
+        "//beacon-chain/forkchoice/types:go_default_library",
+        "//beacon-chain/p2p:go_default_library",
+        "//config/params:go_default_library",
+        "//consensus-types/blocks:go_default_library",
+        "//consensus-types/blocks/testing:go_default_library",
+        "//container/trie:go_default_library",
+        "//encoding/bytesutil:go_default_library",
+        "//proto/prysm/v1alpha1:go_default_library",
+        "//testing/assert:go_default_library",
+        "//testing/require:go_default_library",
+        "//testing/util:go_default_library",
+        "@com_github_ethereum_go_ethereum//:go_default_library",
        "@com_github_ethereum_go_ethereum//common:go_default_library",
        "@com_github_ethereum_go_ethereum//core/types:go_default_library",
-        "@com_github_holiman_uint256//:go_default_library",
-        "@com_github_pkg_errors//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
        "@org_golang_google_protobuf//proto:go_default_library",
+        "@org_golang_x_net//context:go_default_library",
    ],
 )
--- a/beacon-chain/blockchain/chain_info.go
+++ b/beacon-chain/blockchain/chain_info.go
@@ -6,21 +6,19 @@ import (
 	"time"

 	"github.com/pkg/errors"
-	"go.opencensus.io/trace"
-
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
-	f "github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice"
 	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"
-	"github.com/prysmaticlabs/prysm/v4/consensus-types/forkchoice"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
+	ethpbv1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
+	"go.opencensus.io/trace"
 )

 // ChainInfoFetcher defines a common interface for methods in blockchain service which
@@ -47,7 +45,7 @@ type ForkchoiceFetcher interface {
 	HighestReceivedBlockSlot() primitives.Slot
 	ReceivedBlocksLastEpoch() (uint64, error)
 	InsertNode(context.Context, state.BeaconState, [32]byte) error
-	ForkChoiceDump(context.Context) (*forkchoice.Dump, error)
+	ForkChoiceDump(context.Context) (*ethpbv1.ForkChoiceDump, error)
 	NewSlot(context.Context, primitives.Slot) error
 	ProposerBoost() [32]byte
 }
@@ -77,7 +75,6 @@ type HeadFetcher interface {
 	HeadPublicKeyToValidatorIndex(pubKey [fieldparams.BLSPubkeyLength]byte) (primitives.ValidatorIndex, bool)
 	HeadValidatorIndexToPublicKey(ctx context.Context, index primitives.ValidatorIndex) ([fieldparams.BLSPubkeyLength]byte, error)
 	ChainHeads() ([][32]byte, []primitives.Slot)
-	TargetRootForEpoch([32]byte, primitives.Epoch) ([32]byte, error)
 	HeadSyncCommitteeFetcher
 	HeadDomainFetcher
 }
@@ -336,29 +333,14 @@ func (s *Service) HeadValidatorIndexToPublicKey(_ context.Context, index primiti
 	return v.PublicKey(), nil
 }

-// ForkChoicer returns the forkchoice interface.
-func (s *Service) ForkChoicer() f.ForkChoicer {
-	return s.cfg.ForkChoiceStore
-}
-
 // IsOptimistic returns true if the current head is optimistic.
 func (s *Service) IsOptimistic(_ context.Context) (bool, error) {
 	if slots.ToEpoch(s.CurrentSlot()) < params.BeaconConfig().BellatrixForkEpoch {
 		return false, nil
 	}
 	s.headLock.RLock()
-	if s.head == nil {
-		s.headLock.RUnlock()
-		return false, ErrNilHead
-	}
 	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()
@@ -399,7 +381,7 @@ func (s *Service) InForkchoice(root [32]byte) bool {
 	return s.cfg.ForkChoiceStore.HasNode(root)
 }

-// IsViableForCheckpoint returns whether the given checkpoint is a checkpoint in any
+// 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()
@@ -476,13 +458,6 @@ func (s *Service) IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool,
 	return !isCanonical, nil
 }

-// TargetRootForEpoch wraps the corresponding method in forkchoice
-func (s *Service) TargetRootForEpoch(root [32]byte, epoch primitives.Epoch) ([32]byte, error) {
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
-	return s.cfg.ForkChoiceStore.TargetRootForEpoch(root, epoch)
-}
-
 // Ancestor returns the block root of an ancestry block from the input block root.
 //
 // Spec pseudocode definition:
@@ -518,13 +493,6 @@ 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
@@ -544,30 +512,3 @@ func (s *Service) recoverStateSummary(ctx context.Context, blockRoot [32]byte) (
 	}
 	return nil, errBlockDoesNotExist
 }
-
-// BlockBeingSynced returns whether the block with the given root is currently being synced
-func (s *Service) BlockBeingSynced(root [32]byte) bool {
-	return s.blockBeingSynced.isSyncing(root)
-}
-
-// RecentBlockSlot returns block slot form fork choice store
-func (s *Service) RecentBlockSlot(root [32]byte) (primitives.Slot, error) {
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
-	return s.cfg.ForkChoiceStore.Slot(root)
-}
-
-// inRegularSync applies the following heuristics to decide if the node is in
-// regular sync mode vs init sync mode using only forkchoice.
-// It checks that the highest received block is behind the current time by at least 2 epochs
-// and that it was imported at least one epoch late if both of these
-// tests pass then the node is in init sync. The caller of this function MUST
-// have a lock on forkchoice
-func (s *Service) inRegularSync() bool {
-	currentSlot := s.CurrentSlot()
-	fc := s.cfg.ForkChoiceStore
-	if currentSlot-fc.HighestReceivedBlockSlot() < 2*params.BeaconConfig().SlotsPerEpoch {
-		return true
-	}
-	return fc.HighestReceivedBlockDelay() < params.BeaconConfig().SlotsPerEpoch
-}
--- a/beacon-chain/blockchain/chain_info_forkchoice.go
+++ b/beacon-chain/blockchain/chain_info_forkchoice.go
@@ -4,8 +4,8 @@ import (
 	"context"

 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/v4/consensus-types/forkchoice"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
+	ethpbv1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"
 )

 // CachedHeadRoot returns the corresponding value from Forkchoice
@@ -22,13 +22,6 @@ func (s *Service) GetProposerHead() [32]byte {
 	return s.cfg.ForkChoiceStore.GetProposerHead()
 }

-// ShouldOverrideFCU returns the corresponding value from forkchoice
-func (s *Service) ShouldOverrideFCU() bool {
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
-	return s.cfg.ForkChoiceStore.ShouldOverrideFCU()
-}
-
 // SetForkChoiceGenesisTime sets the genesis time in Forkchoice
 func (s *Service) SetForkChoiceGenesisTime(timestamp uint64) {
 	s.cfg.ForkChoiceStore.Lock()
@@ -58,7 +51,7 @@ func (s *Service) InsertNode(ctx context.Context, st state.BeaconState, root [32
 }

 // ForkChoiceDump returns the corresponding value from forkchoice
-func (s *Service) ForkChoiceDump(ctx context.Context) (*forkchoice.Dump, error) {
+func (s *Service) ForkChoiceDump(ctx context.Context) (*ethpbv1.ForkChoiceDump, error) {
 	s.cfg.ForkChoiceStore.RLock()
 	defer s.cfg.ForkChoiceStore.RUnlock()
 	return s.cfg.ForkChoiceStore.ForkChoiceDump(ctx)
--- a/beacon-chain/blockchain/chain_info_test.go
+++ b/beacon-chain/blockchain/chain_info_test.go
@@ -422,18 +422,7 @@ 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)
-
-	// If head is nil, for some reason, an error should be returned rather than panic.
-	c = &Service{}
-	_, err = c.IsOptimistic(ctx)
-	require.ErrorIs(t, err, ErrNilHead)
 }

 func TestService_IsOptimisticBeforeBellatrix(t *testing.T) {
@@ -593,26 +582,3 @@ func TestService_IsFinalized(t *testing.T) {
 	require.Equal(t, true, c.IsFinalized(ctx, br))
 	require.Equal(t, false, c.IsFinalized(ctx, [32]byte{'c'}))
 }
-
-func TestService_inRegularSync(t *testing.T) {
-	ctx := context.Background()
-	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{root: [32]byte{'b'}}}
-	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	st, blkRoot, err := prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
-	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	require.Equal(t, false, c.inRegularSync())
-	c.SetGenesisTime(time.Now().Add(time.Second * time.Duration(-1*int64(params.BeaconConfig().SlotsPerEpoch)*int64(params.BeaconConfig().SecondsPerSlot))))
-	st, blkRoot, err = prepareForkchoiceState(ctx, 128, [32]byte{'b'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, ojc, ofc)
-	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
-	require.Equal(t, false, c.inRegularSync())
-
-	c.SetGenesisTime(time.Now().Add(time.Second * time.Duration(-5*int64(params.BeaconConfig().SlotsPerEpoch)*int64(params.BeaconConfig().SecondsPerSlot))))
-	require.Equal(t, true, c.inRegularSync())
-
-	c.SetGenesisTime(time.Now().Add(time.Second * time.Duration(-1*int64(params.BeaconConfig().SlotsPerEpoch)*int64(params.BeaconConfig().SecondsPerSlot))))
-	c.cfg.ForkChoiceStore.SetGenesisTime(uint64(time.Now().Unix()))
-	require.Equal(t, true, c.inRegularSync())
-}
--- a/beacon-chain/blockchain/currently_syncing_block.go
+++ b/beacon-chain/blockchain/currently_syncing_block.go
@@ -1,27 +0,0 @@
-package blockchain
-
-import "sync"
-
-type currentlySyncingBlock struct {
-	sync.Mutex
-	roots map[[32]byte]struct{}
-}
-
-func (b *currentlySyncingBlock) set(root [32]byte) {
-	b.Lock()
-	defer b.Unlock()
-	b.roots[root] = struct{}{}
-}
-
-func (b *currentlySyncingBlock) unset(root [32]byte) {
-	b.Lock()
-	defer b.Unlock()
-	delete(b.roots, root)
-}
-
-func (b *currentlySyncingBlock) isSyncing(root [32]byte) bool {
-	b.Lock()
-	defer b.Unlock()
-	_, ok := b.roots[root]
-	return ok
-}
--- a/beacon-chain/blockchain/defragment.go
+++ b/beacon-chain/blockchain/defragment.go
@@ -1,27 +0,0 @@
-package blockchain
-
-import (
-	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/v4/config/features"
-	"github.com/prysmaticlabs/prysm/v4/time"
-)
-
-var stateDefragmentationTime = promauto.NewSummary(prometheus.SummaryOpts{
-	Name: "head_state_defragmentation_milliseconds",
-	Help: "Milliseconds it takes to defragment the head state",
-})
-
-// This method defragments our state, so that any specific fields which have
-// a higher number of fragmented indexes are reallocated to a new separate slice for
-// that field.
-func (s *Service) defragmentState(st state.BeaconState) {
-	if !features.Get().EnableExperimentalState {
-		return
-	}
-	startTime := time.Now()
-	st.Defragment()
-	elapsedTime := time.Since(startTime)
-	stateDefragmentationTime.Observe(float64(elapsedTime.Milliseconds()))
-}
--- a/beacon-chain/blockchain/error.go
+++ b/beacon-chain/blockchain/error.go
@@ -17,6 +17,8 @@ var (
 	errNilJustifiedCheckpoint = errors.New("nil justified checkpoint returned from state")
 	// errBlockDoesNotExist is returned when a block does not exist for a particular state summary.
 	errBlockDoesNotExist = errors.New("could not find block in DB")
+	// errWrongBlockCount is returned when the wrong number of blocks or block roots is used
+	errWrongBlockCount = errors.New("wrong number of blocks or block roots")
 	// errBlockNotFoundInCacheOrDB is returned when a block is not found in the cache or DB.
 	errBlockNotFoundInCacheOrDB = errors.New("block not found in cache or db")
 	// errWSBlockNotFound is returned when a block is not found in the WS cache or DB.
@@ -28,12 +30,8 @@ var (
 	// 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")
-	// ErrNilHead is returned when no head is present in the blockchain service.
-	ErrNilHead = errors.New("nil head")
 )

-var errMaxBlobsExceeded = errors.New("Expected commitments in block exceeds MAX_BLOBS_PER_BLOCK")
-
 // An invalid block is the block that fails state transition based on the core protocol rules.
 // The beacon node shall not be accepting nor building blocks that branch off from an invalid block.
 // Some examples of invalid blocks are:
@@ -43,15 +41,13 @@ var errMaxBlobsExceeded = errors.New("Expected commitments in block exceeds MAX_
 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.
@@ -59,11 +55,6 @@ 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
@@ -74,22 +65,11 @@ func IsInvalidBlock(e error) bool {
 	if e == nil {
 		return false
 	}
-	var d invalidBlockError
-	return errors.As(e, &d)
-}
-
-// 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{}
-	}
-	var d invalidBlockError
-	ok := errors.As(e, &d)
+	_, ok := e.(invalidBlockError)
 	if !ok {
-		return [32]byte{}
+		return IsInvalidBlock(errors.Unwrap(e))
 	}
-	return d.LastValidHash()
+	return true
 }

 // InvalidBlockRoot returns the invalid block root. If the error
@@ -98,8 +78,7 @@ func InvalidBlockRoot(e error) [32]byte {
 	if e == nil {
 		return [32]byte{}
 	}
-	var d invalidBlockError
-	ok := errors.As(e, &d)
+	d, ok := e.(invalidBlockError)
 	if !ok {
 		return [32]byte{}
 	}
@@ -111,8 +90,7 @@ func InvalidAncestorRoots(e error) [][32]byte {
 	if e == nil {
 		return [][32]byte{}
 	}
-	var d invalidBlockError
-	ok := errors.As(e, &d)
+	d, ok := e.(invalidBlockError)
 	if !ok {
 		return [][32]byte{}
 	}
--- a/beacon-chain/blockchain/error_test.go
+++ b/beacon-chain/blockchain/error_test.go
@@ -24,9 +24,6 @@ func TestInvalidBlockRoot(t *testing.T) {
 	err := invalidBlock{error: ErrInvalidPayload, root: [32]byte{'a'}}
 	require.Equal(t, [32]byte{'a'}, InvalidBlockRoot(err))
 	require.DeepEqual(t, [][32]byte(nil), InvalidAncestorRoots(err))
-
-	newErr := errors.Wrap(err, "wrap me")
-	require.Equal(t, [32]byte{'a'}, InvalidBlockRoot(newErr))
 }

 func TestInvalidRoots(t *testing.T) {
@@ -36,9 +33,4 @@ func TestInvalidRoots(t *testing.T) {
 	require.Equal(t, true, IsInvalidBlock(err))
 	require.Equal(t, [32]byte{'a'}, InvalidBlockRoot(err))
 	require.DeepEqual(t, roots, InvalidAncestorRoots(err))
-
-	newErr := errors.Wrap(err, "wrap me")
-	require.Equal(t, true, IsInvalidBlock(err))
-	require.Equal(t, [32]byte{'a'}, InvalidBlockRoot(newErr))
-	require.DeepEqual(t, roots, InvalidAncestorRoots(newErr))
 }
--- a/beacon-chain/blockchain/execution_engine.go
+++ b/beacon-chain/blockchain/execution_engine.go
@@ -2,16 +2,14 @@ package blockchain

 import (
 	"context"
-	"crypto/sha256"
 	"fmt"

-	"github.com/ethereum/go-ethereum/common"
 	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/blocks"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
 	"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/kv"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/execution"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v4/config/features"
@@ -28,22 +26,23 @@ import (
 	"go.opencensus.io/trace"
 )

-const blobCommitmentVersionKZG uint8 = 0x01
-
 var defaultLatestValidHash = bytesutil.PadTo([]byte{0xff}, 32)

+// notifyForkchoiceUpdateArg is the argument for the forkchoice update notification `notifyForkchoiceUpdate`.
+type notifyForkchoiceUpdateArg struct {
+	headState state.BeaconState
+	headRoot  [32]byte
+	headBlock interfaces.ReadOnlyBeaconBlock
+}
+
 // notifyForkchoiceUpdate signals execution engine the fork choice updates. Execution engine should:
 // 1. Re-organizes the execution payload chain and corresponding state to make head_block_hash the head.
 // 2. Applies finality to the execution state: it irreversibly persists the chain of all execution payloads and corresponding state, up to and including finalized_block_hash.
-func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*enginev1.PayloadIDBytes, error) {
+func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkchoiceUpdateArg) (*enginev1.PayloadIDBytes, error) {
 	ctx, span := trace.StartSpan(ctx, "blockChain.notifyForkchoiceUpdate")
 	defer span.End()

-	if arg.headBlock.IsNil() {
-		log.Error("Head block is nil")
-		return nil, nil
-	}
-	headBlk := arg.headBlock.Block()
+	headBlk := arg.headBlock
 	if headBlk == nil || headBlk.IsNil() || headBlk.Body().IsNil() {
 		log.Error("Head block is nil")
 		return nil, nil
@@ -69,10 +68,11 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*
 		SafeBlockHash:      justifiedHash[:],
 		FinalizedBlockHash: finalizedHash[:],
 	}
-	if arg.attributes == nil {
-		arg.attributes = payloadattribute.EmptyWithVersion(headBlk.Version())
-	}
-	payloadID, lastValidHash, err := s.cfg.ExecutionEngineCaller.ForkchoiceUpdated(ctx, fcs, arg.attributes)
+
+	nextSlot := s.CurrentSlot() + 1 // Cache payload ID for next slot proposer.
+	hasAttr, attr, proposerId := s.getPayloadAttribute(ctx, arg.headState, nextSlot, arg.headRoot[:])
+
+	payloadID, lastValidHash, err := s.cfg.ExecutionEngineCaller.ForkchoiceUpdated(ctx, fcs, attr)
 	if err != nil {
 		switch err {
 		case execution.ErrAcceptedSyncingPayloadStatus:
@@ -118,11 +118,10 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*
 				log.WithError(err).Error("Could not get head state")
 				return nil, nil
 			}
-			pid, err := s.notifyForkchoiceUpdate(ctx, &fcuConfig{
-				headState:  st,
-				headRoot:   r,
-				headBlock:  b,
-				attributes: arg.attributes,
+			pid, err := s.notifyForkchoiceUpdate(ctx, &notifyForkchoiceUpdateArg{
+				headState: st,
+				headRoot:  r,
+				headBlock: b.Block(),
 			})
 			if err != nil {
 				return nil, err // Returning err because it's recursive here.
@@ -150,19 +149,12 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*
 		log.WithError(err).Error("Could not set head root to valid")
 		return nil, nil
 	}
-	// If the forkchoice update call has an attribute, update the payload ID cache.
-	hasAttr := arg.attributes != nil && !arg.attributes.IsEmpty()
-	nextSlot := s.CurrentSlot() + 1
+	// If the forkchoice update call has an attribute, update the proposer payload ID cache.
 	if hasAttr && payloadID != nil {
 		var pId [8]byte
 		copy(pId[:], payloadID[:])
-		log.WithFields(logrus.Fields{
-			"blockRoot": fmt.Sprintf("%#x", bytesutil.Trunc(arg.headRoot[:])),
-			"headSlot":  headBlk.Slot(),
-			"payloadID": fmt.Sprintf("%#x", bytesutil.Trunc(payloadID[:])),
-		}).Info("Forkchoice updated with payload attributes for proposal")
-		s.cfg.PayloadIDCache.Set(nextSlot, arg.headRoot, pId)
-	} else if hasAttr && payloadID == nil && !features.Get().PrepareAllPayloads {
+		s.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(nextSlot, proposerId, pId, arg.headRoot)
+	} else if hasAttr && payloadID == nil {
 		log.WithFields(logrus.Fields{
 			"blockHash": fmt.Sprintf("%#x", headPayload.BlockHash()),
 			"slot":      headBlk.Slot(),
@@ -190,24 +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")
 	}
@@ -218,19 +207,7 @@ func (s *Service) notifyNewPayload(ctx context.Context, preStateVersion int,
 	if err != nil {
 		return false, errors.Wrap(invalidBlock{error: err}, "could not get execution payload")
 	}
-
-	var lastValidHash []byte
-	if blk.Version() >= version.Deneb {
-		var versionedHashes []common.Hash
-		versionedHashes, err = kzgCommitmentsToVersionedHashes(blk.Block().Body())
-		if err != nil {
-			return false, errors.Wrap(err, "could not get versioned hashes to feed the engine")
-		}
-		pr := common.Hash(blk.Block().ParentRoot())
-		lastValidHash, err = s.cfg.ExecutionEngineCaller.NewPayload(ctx, payload, versionedHashes, &pr)
-	} else {
-		lastValidHash, err = s.cfg.ExecutionEngineCaller.NewPayload(ctx, payload, []common.Hash{}, &common.Hash{} /*empty version hashes and root before Deneb*/)
-	}
+	lastValidHash, err := s.cfg.ExecutionEngineCaller.NewPayload(ctx, payload)
 	switch err {
 	case nil:
 		newPayloadValidNodeCount.Inc()
@@ -243,173 +220,138 @@ 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) payloadattribute.Attributer {
+func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState, slot primitives.Slot, headRoot []byte) (bool, payloadattribute.Attributer, primitives.ValidatorIndex) {
 	emptyAttri := payloadattribute.EmptyWithVersion(st.Version())
-
-	// If it is an epoch boundary then process slots to get the right
-	// shuffling before checking if the proposer is tracked. Otherwise
-	// perform this check before. This is cheap as the NSC has already been updated.
-	var val cache.TrackedValidator
-	var ok bool
-	e := slots.ToEpoch(slot)
-	stateEpoch := slots.ToEpoch(st.Slot())
-	if e == stateEpoch {
-		val, ok = s.trackedProposer(st, slot)
-		if !ok {
-			return emptyAttri
-		}
+	// Root is `[32]byte{}` since we are retrieving proposer ID of a given slot. During insertion at assignment the root was not known.
+	proposerID, _, ok := s.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(slot, [32]byte{} /* root */)
+	if !ok && !features.Get().PrepareAllPayloads { // There's no need to build attribute if there is no proposer for slot.
+		return false, emptyAttri, 0
 	}
+
+	// Get previous randao.
 	st = st.Copy()
 	if slot > st.Slot() {
 		var err error
 		st, err = transition.ProcessSlotsUsingNextSlotCache(ctx, st, headRoot, slot)
 		if err != nil {
 			log.WithError(err).Error("Could not process slots to get payload attribute")
-			return emptyAttri
+			return false, emptyAttri, 0
 		}
 	}
-	if e > stateEpoch {
-		emptyAttri := payloadattribute.EmptyWithVersion(st.Version())
-		val, ok = s.trackedProposer(st, slot)
-		if !ok {
-			return emptyAttri
-		}
-	}
-	// Get previous randao.
 	prevRando, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
 	if err != nil {
 		log.WithError(err).Error("Could not get randao mix to get payload attribute")
-		return emptyAttri
+		return false, emptyAttri, 0
+	}
+
+	// Get fee recipient.
+	feeRecipient := params.BeaconConfig().DefaultFeeRecipient
+	recipient, err := s.cfg.BeaconDB.FeeRecipientByValidatorID(ctx, proposerID)
+	switch {
+	case errors.Is(err, kv.ErrNotFoundFeeRecipient):
+		if feeRecipient.String() == params.BeaconConfig().EthBurnAddressHex {
+			logrus.WithFields(logrus.Fields{
+				"validatorIndex": proposerID,
+				"burnAddress":    params.BeaconConfig().EthBurnAddressHex,
+			}).Warn("Fee recipient is currently using the burn address, " +
+				"you will not be rewarded transaction fees on this setting. " +
+				"Please set a different eth address as the fee recipient. " +
+				"Please refer to our documentation for instructions")
+		}
+	case err != nil:
+		log.WithError(err).Error("Could not get fee recipient to get payload attribute")
+		return false, emptyAttri, 0
+	default:
+		feeRecipient = recipient
 	}

 	// Get timestamp.
 	t, err := slots.ToTime(uint64(s.genesisTime.Unix()), slot)
 	if err != nil {
 		log.WithError(err).Error("Could not get timestamp to get payload attribute")
-		return emptyAttri
+		return false, emptyAttri, 0
 	}

 	var attr payloadattribute.Attributer
 	switch st.Version() {
-	case version.Deneb:
-		withdrawals, err := st.ExpectedWithdrawals()
-		if err != nil {
-			log.WithError(err).Error("Could not get expected withdrawals to get payload attribute")
-			return emptyAttri
-		}
-		attr, err = payloadattribute.New(&enginev1.PayloadAttributesV3{
-			Timestamp:             uint64(t.Unix()),
-			PrevRandao:            prevRando,
-			SuggestedFeeRecipient: val.FeeRecipient[:],
-			Withdrawals:           withdrawals,
-			ParentBeaconBlockRoot: headRoot,
-		})
-		if err != nil {
-			log.WithError(err).Error("Could not get payload attribute")
-			return emptyAttri
-		}
 	case version.Capella:
 		withdrawals, err := st.ExpectedWithdrawals()
 		if err != nil {
 			log.WithError(err).Error("Could not get expected withdrawals to get payload attribute")
-			return emptyAttri
+			return false, emptyAttri, 0
 		}
 		attr, err = payloadattribute.New(&enginev1.PayloadAttributesV2{
 			Timestamp:             uint64(t.Unix()),
 			PrevRandao:            prevRando,
-			SuggestedFeeRecipient: val.FeeRecipient[:],
+			SuggestedFeeRecipient: feeRecipient.Bytes(),
 			Withdrawals:           withdrawals,
 		})
 		if err != nil {
 			log.WithError(err).Error("Could not get payload attribute")
-			return emptyAttri
+			return false, emptyAttri, 0
 		}
 	case version.Bellatrix:
 		attr, err = payloadattribute.New(&enginev1.PayloadAttributes{
 			Timestamp:             uint64(t.Unix()),
 			PrevRandao:            prevRando,
-			SuggestedFeeRecipient: val.FeeRecipient[:],
+			SuggestedFeeRecipient: feeRecipient.Bytes(),
 		})
 		if err != nil {
 			log.WithError(err).Error("Could not get payload attribute")
-			return emptyAttri
+			return false, emptyAttri, 0
 		}
 	default:
 		log.WithField("version", st.Version()).Error("Could not get payload attribute due to unknown state version")
-		return emptyAttri
+		return false, emptyAttri, 0
 	}

-	return attr
+	return true, attr, proposerID
 }

-// removeInvalidBlockAndState removes the invalid block, blob and its corresponding state from the cache and DB.
+// removeInvalidBlockAndState removes the invalid block and its corresponding state from the cache and DB.
 func (s *Service) removeInvalidBlockAndState(ctx context.Context, blkRoots [][32]byte) error {
 	for _, root := range blkRoots {
 		if err := s.cfg.StateGen.DeleteStateFromCaches(ctx, root); err != nil {
 			return err
 		}
+
 		// Delete block also deletes the state as well.
 		if err := s.cfg.BeaconDB.DeleteBlock(ctx, root); err != nil {
 			// TODO(10487): If a caller requests to delete a root that's justified and finalized. We should gracefully shutdown.
 			// This is an irreparable condition, it would me a justified or finalized block has become invalid.
 			return err
 		}
-		if err := s.blobStorage.Remove(root); err != nil {
-			// Blobs may not exist for some blocks, leading to deletion failures. Log such errors at debug level.
-			log.WithError(err).Debug("Could not remove blob from blob storage")
-		}
 	}
 	return nil
 }
-
-func kzgCommitmentsToVersionedHashes(body interfaces.ReadOnlyBeaconBlockBody) ([]common.Hash, error) {
-	commitments, err := body.BlobKzgCommitments()
-	if err != nil {
-		return nil, errors.Wrap(invalidBlock{error: err}, "could not get blob kzg commitments")
-	}
-
-	versionedHashes := make([]common.Hash, len(commitments))
-	for i, commitment := range commitments {
-		versionedHashes[i] = ConvertKzgCommitmentToVersionedHash(commitment)
-	}
-	return versionedHashes, nil
-}
-
-func ConvertKzgCommitmentToVersionedHash(commitment []byte) common.Hash {
-	versionedHash := sha256.Sum256(commitment)
-	versionedHash[0] = blobCommitmentVersionKZG
-	return versionedHash
-}
--- a/beacon-chain/blockchain/execution_engine_test.go
+++ b/beacon-chain/blockchain/execution_engine_test.go
@@ -26,10 +26,11 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/testing/assert"
 	"github.com/prysmaticlabs/prysm/v4/testing/require"
 	"github.com/prysmaticlabs/prysm/v4/testing/util"
+	logTest "github.com/sirupsen/logrus/hooks/test"
 )

 func Test_NotifyForkchoiceUpdate_GetPayloadAttrErrorCanContinue(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx, beaconDB, fcs := tr.ctx, tr.db, tr.fcs

 	altairBlk := util.SaveBlock(t, ctx, beaconDB, util.NewBeaconBlockAltair())
@@ -56,14 +57,11 @@ func Test_NotifyForkchoiceUpdate_GetPayloadAttrErrorCanContinue(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))

-	sb := &ethpb.SignedBeaconBlockBellatrix{
-		Block: &ethpb.BeaconBlockBellatrix{
-			Body: &ethpb.BeaconBlockBodyBellatrix{
-				ExecutionPayload: &v1.ExecutionPayload{},
-			},
+	b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlockBellatrix{
+		Body: &ethpb.BeaconBlockBodyBellatrix{
+			ExecutionPayload: &v1.ExecutionPayload{},
 		},
-	}
-	b, err := consensusblocks.NewSignedBeaconBlock(sb)
+	})
 	require.NoError(t, err)

 	pid := &v1.PayloadIDBytes{1}
@@ -75,20 +73,20 @@ func Test_NotifyForkchoiceUpdate_GetPayloadAttrErrorCanContinue(t *testing.T) {
 	// Intentionally generate a bad state such that `hash_tree_root` fails during `process_slot`
 	s, err := state_native.InitializeFromProtoPhase0(&ethpb.BeaconState{})
 	require.NoError(t, err)
-	arg := &fcuConfig{
+	arg := &notifyForkchoiceUpdateArg{
 		headState: s,
 		headRoot:  [32]byte{},
 		headBlock: b,
 	}

-	service.cfg.PayloadIDCache.Set(1, [32]byte{}, [8]byte{})
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(1, 0, [8]byte{}, [32]byte{})
 	got, err := service.notifyForkchoiceUpdate(ctx, arg)
 	require.NoError(t, err)
 	require.DeepEqual(t, got, pid) // We still get a payload ID even though the state is bad. This means it returns until the end.
 }

 func Test_NotifyForkchoiceUpdate(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx, beaconDB, fcs := tr.ctx, tr.db, tr.fcs

 	altairBlk := util.SaveBlock(t, ctx, beaconDB, util.NewBeaconBlockAltair())
@@ -116,7 +114,7 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {

 	tests := []struct {
 		name             string
-		blk              interfaces.ReadOnlySignedBeaconBlock
+		blk              interfaces.ReadOnlyBeaconBlock
 		headRoot         [32]byte
 		finalizedRoot    [32]byte
 		justifiedRoot    [32]byte
@@ -125,24 +123,24 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 	}{
 		{
 			name: "phase0 block",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
-				b, err := consensusblocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}}})
+			blk: func() interfaces.ReadOnlyBeaconBlock {
+				b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}})
 				require.NoError(t, err)
 				return b
 			}(),
 		},
 		{
 			name: "altair block",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
-				b, err := consensusblocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockAltair{Block: &ethpb.BeaconBlockAltair{Body: &ethpb.BeaconBlockBodyAltair{}}})
+			blk: func() interfaces.ReadOnlyBeaconBlock {
+				b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlockAltair{Body: &ethpb.BeaconBlockBodyAltair{}})
 				require.NoError(t, err)
 				return b
 			}(),
 		},
 		{
 			name: "not execution block",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
-				b, err := consensusblocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockBellatrix{Block: &ethpb.BeaconBlockBellatrix{
+			blk: func() interfaces.ReadOnlyBeaconBlock {
+				b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{
 							ParentHash:    make([]byte, fieldparams.RootLength),
@@ -151,25 +149,23 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 							ReceiptsRoot:  make([]byte, fieldparams.RootLength),
 							LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
 							PrevRandao:    make([]byte, fieldparams.RootLength),
-							ExtraData:     make([]byte, 0),
 							BaseFeePerGas: make([]byte, fieldparams.RootLength),
 							BlockHash:     make([]byte, fieldparams.RootLength),
-							Transactions:  make([][]byte, 0),
 						},
 					},
-				}})
+				})
 				require.NoError(t, err)
 				return b
 			}(),
 		},
 		{
 			name: "happy case: finalized root is altair block",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
-				b, err := consensusblocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockBellatrix{Block: &ethpb.BeaconBlockBellatrix{
+			blk: func() interfaces.ReadOnlyBeaconBlock {
+				b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{},
 					},
-				}})
+				})
 				require.NoError(t, err)
 				return b
 			}(),
@@ -178,12 +174,12 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		},
 		{
 			name: "happy case: finalized root is bellatrix block",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
-				b, err := consensusblocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockBellatrix{Block: &ethpb.BeaconBlockBellatrix{
+			blk: func() interfaces.ReadOnlyBeaconBlock {
+				b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{},
 					},
-				}})
+				})
 				require.NoError(t, err)
 				return b
 			}(),
@@ -192,12 +188,12 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		},
 		{
 			name: "forkchoice updated with optimistic block",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
-				b, err := consensusblocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockBellatrix{Block: &ethpb.BeaconBlockBellatrix{
+			blk: func() interfaces.ReadOnlyBeaconBlock {
+				b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{},
 					},
-				}})
+				})
 				require.NoError(t, err)
 				return b
 			}(),
@@ -207,12 +203,12 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		},
 		{
 			name: "forkchoice updated with invalid block",
-			blk: func() interfaces.ReadOnlySignedBeaconBlock {
-				b, err := consensusblocks.NewSignedBeaconBlock(&ethpb.SignedBeaconBlockBellatrix{Block: &ethpb.BeaconBlockBellatrix{
+			blk: func() interfaces.ReadOnlyBeaconBlock {
+				b, err := consensusblocks.NewBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{},
 					},
-				}})
+				})
 				require.NoError(t, err)
 				return b
 			}(),
@@ -230,7 +226,7 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 			st, _ := util.DeterministicGenesisState(t, 1)
 			require.NoError(t, beaconDB.SaveState(ctx, st, tt.finalizedRoot))
 			require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, tt.finalizedRoot))
-			arg := &fcuConfig{
+			arg := &notifyForkchoiceUpdateArg{
 				headState: st,
 				headRoot:  tt.headRoot,
 				headBlock: tt.blk,
@@ -250,7 +246,7 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 }

 func Test_NotifyForkchoiceUpdate_NIlLVH(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx, beaconDB, fcs := tr.ctx, tr.db, tr.fcs

 	// Prepare blocks
@@ -310,9 +306,9 @@ func Test_NotifyForkchoiceUpdate_NIlLVH(t *testing.T) {

 	require.NoError(t, beaconDB.SaveState(ctx, st, bra))
 	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, bra))
-	a := &fcuConfig{
+	a := &notifyForkchoiceUpdateArg{
 		headState: st,
-		headBlock: wbd,
+		headBlock: wbd.Block(),
 		headRoot:  brd,
 	}
 	_, err = service.notifyForkchoiceUpdate(ctx, a)
@@ -338,7 +334,7 @@ func Test_NotifyForkchoiceUpdate_NIlLVH(t *testing.T) {
 // 3. the blockchain package calls fcu to obtain heads G -> F -> D.

 func Test_NotifyForkchoiceUpdateRecursive_DoublyLinkedTree(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx, beaconDB, fcs := tr.ctx, tr.db, tr.fcs

 	// Prepare blocks
@@ -447,9 +443,9 @@ func Test_NotifyForkchoiceUpdateRecursive_DoublyLinkedTree(t *testing.T) {

 	require.NoError(t, beaconDB.SaveState(ctx, st, bra))
 	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, bra))
-	a := &fcuConfig{
+	a := &notifyForkchoiceUpdateArg{
 		headState: st,
-		headBlock: wbg,
+		headBlock: wbg.Block(),
 		headRoot:  brg,
 	}
 	_, err = service.notifyForkchoiceUpdate(ctx, a)
@@ -471,7 +467,7 @@ func Test_NotifyNewPayload(t *testing.T) {
 	cfg := params.BeaconConfig()
 	cfg.TerminalTotalDifficulty = "2"
 	params.OverrideBeaconConfig(cfg)
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx, fcs := tr.ctx, tr.fcs

 	phase0State, _ := util.DeterministicGenesisState(t, 1)
@@ -496,10 +492,8 @@ func Test_NotifyNewPayload(t *testing.T) {
 					ReceiptsRoot:  make([]byte, fieldparams.RootLength),
 					LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
 					PrevRandao:    make([]byte, fieldparams.RootLength),
-					ExtraData:     make([]byte, 0),
 					BaseFeePerGas: make([]byte, fieldparams.RootLength),
 					BlockHash:     make([]byte, fieldparams.RootLength),
-					Transactions:  make([][]byte, 0),
 				},
 			},
 		},
@@ -531,13 +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,
 		},
 		{
@@ -601,10 +593,8 @@ func Test_NotifyNewPayload(t *testing.T) {
 								ReceiptsRoot:  make([]byte, fieldparams.RootLength),
 								LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
 								PrevRandao:    make([]byte, fieldparams.RootLength),
-								ExtraData:     make([]byte, 0),
 								BaseFeePerGas: make([]byte, fieldparams.RootLength),
 								BlockHash:     make([]byte, fieldparams.RootLength),
-								Transactions:  make([][]byte, 0),
 							},
 						},
 					},
@@ -717,7 +707,7 @@ func Test_NotifyNewPayload_SetOptimisticToValid(t *testing.T) {
 	cfg.TerminalTotalDifficulty = "2"
 	params.OverrideBeaconConfig(cfg)

-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx := tr.ctx

 	bellatrixState, _ := util.DeterministicGenesisStateBellatrix(t, 2)
@@ -753,145 +743,90 @@ 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, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx := tr.ctx

 	st, _ := util.DeterministicGenesisStateBellatrix(t, 1)
-	attr := service.getPayloadAttribute(ctx, st, 0, []byte{})
-	require.Equal(t, true, attr.IsEmpty())
+	hasPayload, _, vId := service.getPayloadAttribute(ctx, st, 0, []byte{})
+	require.Equal(t, false, hasPayload)
+	require.Equal(t, primitives.ValidatorIndex(0), vId)

-	service.cfg.TrackedValidatorsCache.Set(cache.TrackedValidator{Active: true, Index: 0})
 	// Cache hit, advance state, no fee recipient
+	suggestedVid := primitives.ValidatorIndex(1)
 	slot := primitives.Slot(1)
-	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	attr = service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
-	require.Equal(t, false, attr.IsEmpty())
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{}, [32]byte{})
+	hook := logTest.NewGlobal()
+	hasPayload, attr, vId := service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
+	require.Equal(t, true, hasPayload)
+	require.Equal(t, suggestedVid, vId)
 	require.Equal(t, params.BeaconConfig().EthBurnAddressHex, common.BytesToAddress(attr.SuggestedFeeRecipient()).String())
+	require.LogsContain(t, hook, "Fee recipient is currently using the burn address")

 	// Cache hit, advance state, has fee recipient
 	suggestedAddr := common.HexToAddress("123")
-	service.cfg.TrackedValidatorsCache.Set(cache.TrackedValidator{Active: true, FeeRecipient: primitives.ExecutionAddress(suggestedAddr), Index: 0})
-	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	attr = service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
-	require.Equal(t, false, attr.IsEmpty())
+	require.NoError(t, service.cfg.BeaconDB.SaveFeeRecipientsByValidatorIDs(ctx, []primitives.ValidatorIndex{suggestedVid}, []common.Address{suggestedAddr}))
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{}, [32]byte{})
+	hasPayload, attr, vId = service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
+	require.Equal(t, true, hasPayload)
+	require.Equal(t, suggestedVid, vId)
 	require.Equal(t, suggestedAddr, common.BytesToAddress(attr.SuggestedFeeRecipient()))
 }

 func Test_GetPayloadAttribute_PrepareAllPayloads(t *testing.T) {
+	hook := logTest.NewGlobal()
 	resetCfg := features.InitWithReset(&features.Flags{
 		PrepareAllPayloads: true,
 	})
 	defer resetCfg()

-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx := tr.ctx

 	st, _ := util.DeterministicGenesisStateBellatrix(t, 1)
-	attr := service.getPayloadAttribute(ctx, st, 0, []byte{})
-	require.Equal(t, false, attr.IsEmpty())
+	hasPayload, attr, vId := service.getPayloadAttribute(ctx, st, 0, []byte{})
+	require.Equal(t, true, hasPayload)
+	require.Equal(t, primitives.ValidatorIndex(0), vId)
 	require.Equal(t, params.BeaconConfig().EthBurnAddressHex, common.BytesToAddress(attr.SuggestedFeeRecipient()).String())
+	require.LogsContain(t, hook, "Fee recipient is currently using the burn address")
 }

 func Test_GetPayloadAttributeV2(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx := tr.ctx

 	st, _ := util.DeterministicGenesisStateCapella(t, 1)
-	attr := service.getPayloadAttribute(ctx, st, 0, []byte{})
-	require.Equal(t, true, attr.IsEmpty())
+	hasPayload, _, vId := service.getPayloadAttribute(ctx, st, 0, []byte{})
+	require.Equal(t, false, hasPayload)
+	require.Equal(t, primitives.ValidatorIndex(0), vId)

 	// Cache hit, advance state, no fee recipient
-	service.cfg.TrackedValidatorsCache.Set(cache.TrackedValidator{Active: true, Index: 0})
+	suggestedVid := primitives.ValidatorIndex(1)
 	slot := primitives.Slot(1)
-	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	attr = service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
-	require.Equal(t, false, attr.IsEmpty())
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{}, [32]byte{})
+	hook := logTest.NewGlobal()
+	hasPayload, attr, vId := service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
+	require.Equal(t, true, hasPayload)
+	require.Equal(t, suggestedVid, vId)
 	require.Equal(t, params.BeaconConfig().EthBurnAddressHex, common.BytesToAddress(attr.SuggestedFeeRecipient()).String())
+	require.LogsContain(t, hook, "Fee recipient is currently using the burn address")
 	a, err := attr.Withdrawals()
 	require.NoError(t, err)
 	require.Equal(t, 0, len(a))

 	// Cache hit, advance state, has fee recipient
 	suggestedAddr := common.HexToAddress("123")
-	service.cfg.TrackedValidatorsCache.Set(cache.TrackedValidator{Active: true, FeeRecipient: primitives.ExecutionAddress(suggestedAddr), Index: 0})
-	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	attr = service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
-	require.Equal(t, false, attr.IsEmpty())
+	require.NoError(t, service.cfg.BeaconDB.SaveFeeRecipientsByValidatorIDs(ctx, []primitives.ValidatorIndex{suggestedVid}, []common.Address{suggestedAddr}))
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{}, [32]byte{})
+	hasPayload, attr, vId = service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
+	require.Equal(t, true, hasPayload)
+	require.Equal(t, suggestedVid, vId)
 	require.Equal(t, suggestedAddr, common.BytesToAddress(attr.SuggestedFeeRecipient()))
 	a, err = attr.Withdrawals()
 	require.NoError(t, err)
 	require.Equal(t, 0, len(a))
 }

-func Test_GetPayloadAttributeDeneb(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
-	ctx := tr.ctx
-
-	st, _ := util.DeterministicGenesisStateDeneb(t, 1)
-	attr := service.getPayloadAttribute(ctx, st, 0, []byte{})
-	require.Equal(t, true, attr.IsEmpty())
-
-	// Cache hit, advance state, no fee recipient
-	slot := primitives.Slot(1)
-	service.cfg.TrackedValidatorsCache.Set(cache.TrackedValidator{Active: true, Index: 0})
-	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	attr = service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
-	require.Equal(t, false, attr.IsEmpty())
-	require.Equal(t, params.BeaconConfig().EthBurnAddressHex, common.BytesToAddress(attr.SuggestedFeeRecipient()).String())
-	a, err := attr.Withdrawals()
-	require.NoError(t, err)
-	require.Equal(t, 0, len(a))
-
-	// Cache hit, advance state, has fee recipient
-	suggestedAddr := common.HexToAddress("123")
-	service.cfg.TrackedValidatorsCache.Set(cache.TrackedValidator{Active: true, FeeRecipient: primitives.ExecutionAddress(suggestedAddr), Index: 0})
-	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	attr = service.getPayloadAttribute(ctx, st, slot, params.BeaconConfig().ZeroHash[:])
-	require.Equal(t, false, attr.IsEmpty())
-	require.Equal(t, suggestedAddr, common.BytesToAddress(attr.SuggestedFeeRecipient()))
-	a, err = attr.Withdrawals()
-	require.NoError(t, err)
-	require.Equal(t, 0, len(a))
-
-	attrV3, err := attr.PbV3()
-	require.NoError(t, err)
-	hr := service.headRoot()
-	require.Equal(t, hr, [32]byte(attrV3.ParentBeaconBlockRoot))
-
-}
-
 func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	params.SetupTestConfigCleanup(t)
 	params.OverrideBeaconConfig(params.MainnetConfig())
@@ -1077,60 +1012,3 @@ func TestService_getPayloadHash(t *testing.T) {
 	require.NoError(t, err)
 	require.DeepEqual(t, [32]byte{'a'}, h)
 }
-
-func TestKZGCommitmentToVersionedHashes(t *testing.T) {
-	kzg1 := make([]byte, 96)
-	kzg1[10] = 'a'
-	kzg2 := make([]byte, 96)
-	kzg2[1] = 'b'
-	commitments := [][]byte{kzg1, kzg2}
-
-	blk := &ethpb.SignedBeaconBlockDeneb{
-		Block: &ethpb.BeaconBlockDeneb{
-			Body: &ethpb.BeaconBlockBodyDeneb{
-				BlobKzgCommitments: commitments,
-			},
-		},
-	}
-	b, err := consensusblocks.NewSignedBeaconBlock(blk)
-	require.NoError(t, err)
-	vhs, err := kzgCommitmentsToVersionedHashes(b.Block().Body())
-	require.NoError(t, err)
-	vh0 := "0x01cf2315c97658a7ed54ada181765e23b3fadb5150fab39509f631c0b9af4566"
-	vh1 := "0x01e27ce28e527eb07196b31af0f5fa1882ace701a682022ab779f816ac39d47e"
-	require.Equal(t, 2, len(vhs))
-	require.Equal(t, vhs[0].String(), vh0)
-	require.Equal(t, vhs[1].String(), vh1)
-}
-
-func TestComputePayloadAttribute(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
-	ctx := tr.ctx
-
-	st, _ := util.DeterministicGenesisStateBellatrix(t, 1)
-
-	service.cfg.TrackedValidatorsCache.Set(cache.TrackedValidator{Active: true, Index: 0})
-	// Cache hit, advance state, no fee recipient
-	slot := primitives.Slot(1)
-	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	cfg := &postBlockProcessConfig{
-		ctx:       ctx,
-		blockRoot: [32]byte{'a'},
-	}
-	fcu := &fcuConfig{
-		headState:     st,
-		proposingSlot: slot,
-		headRoot:      [32]byte{},
-	}
-	require.NoError(t, service.computePayloadAttributes(cfg, fcu))
-	require.Equal(t, false, fcu.attributes.IsEmpty())
-	require.Equal(t, params.BeaconConfig().EthBurnAddressHex, common.BytesToAddress(fcu.attributes.SuggestedFeeRecipient()).String())
-
-	// Cache hit, advance state, has fee recipient
-	suggestedAddr := common.HexToAddress("123")
-	service.cfg.TrackedValidatorsCache.Set(cache.TrackedValidator{Active: true, FeeRecipient: primitives.ExecutionAddress(suggestedAddr), Index: 0})
-	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	require.NoError(t, service.computePayloadAttributes(cfg, fcu))
-	require.Equal(t, false, fcu.attributes.IsEmpty())
-	require.Equal(t, suggestedAddr, common.BytesToAddress(fcu.attributes.SuggestedFeeRecipient()))
-}
--- a/beacon-chain/blockchain/forkchoice_update_execution.go
+++ b/beacon-chain/blockchain/forkchoice_update_execution.go
@@ -8,15 +8,20 @@ import (
 	"github.com/pkg/errors"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice/doubly-linked-tree"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/v4/config/features"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
-	payloadattribute "github.com/prysmaticlabs/prysm/v4/consensus-types/payload-attribute"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
 	"github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
 )

+func (s *Service) isNewProposer(slot primitives.Slot) bool {
+	_, _, ok := s.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(slot, [32]byte{} /* root */)
+	return ok || features.Get().PrepareAllPayloads
+}
+
 func (s *Service) isNewHead(r [32]byte) bool {
 	s.headLock.RLock()
 	defer s.headLock.RUnlock()
@@ -44,69 +49,48 @@ func (s *Service) getStateAndBlock(ctx context.Context, r [32]byte) (state.Beaco
 	return headState, newHeadBlock, nil
 }

-type fcuConfig struct {
-	headState     state.BeaconState
-	headBlock     interfaces.ReadOnlySignedBeaconBlock
-	headRoot      [32]byte
-	proposingSlot primitives.Slot
-	attributes    payloadattribute.Attributer
-}
-
-// sendFCU handles the logic to notify the engine of a forckhoice update
-// for the first time when processing an incoming block during regular sync. It
-// always updates the shuffling caches and handles epoch transitions when the
-// incoming block is late, preparing payload attributes in this case while it
-// only sends a message with empty attributes for early blocks.
-func (s *Service) sendFCU(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) error {
-	if !s.isNewHead(cfg.headRoot) {
-		return nil
-	}
-	if fcuArgs.attributes != nil && !fcuArgs.attributes.IsEmpty() && s.shouldOverrideFCU(cfg.headRoot, s.CurrentSlot()+1) {
-		return nil
-	}
-	return s.forkchoiceUpdateWithExecution(cfg.ctx, fcuArgs)
-}
-
-// sendFCUWithAttributes computes the payload attributes and sends an FCU message
-// to the engine if needed
-func (s *Service) sendFCUWithAttributes(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) {
-	slotCtx, cancel := context.WithTimeout(context.Background(), slotDeadline)
-	defer cancel()
-	cfg.ctx = slotCtx
-	if err := s.computePayloadAttributes(cfg, fcuArgs); err != nil {
-		log.WithError(err).Error("could not compute payload attributes")
-		return
-	}
-	if fcuArgs.attributes.IsEmpty() {
-		return
-	}
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
-	if _, err := s.notifyForkchoiceUpdate(cfg.ctx, fcuArgs); err != nil {
-		log.WithError(err).Error("could not update forkchoice with payload attributes for proposal")
-	}
-}
-
 // fockchoiceUpdateWithExecution is a wrapper around notifyForkchoiceUpdate. It decides whether a new call to FCU should be made.
-func (s *Service) forkchoiceUpdateWithExecution(ctx context.Context, args *fcuConfig) error {
+// it returns true if the new head is updated
+func (s *Service) forkchoiceUpdateWithExecution(ctx context.Context, newHeadRoot [32]byte, proposingSlot primitives.Slot) (bool, error) {
 	_, span := trace.StartSpan(ctx, "beacon-chain.blockchain.forkchoiceUpdateWithExecution")
 	defer span.End()
 	// Note: Use the service context here to avoid the parent context being ended during a forkchoice update.
 	ctx = trace.NewContext(s.ctx, span)
-	_, err := s.notifyForkchoiceUpdate(ctx, args)
+
+	isNewHead := s.isNewHead(newHeadRoot)
+	if !isNewHead {
+		return false, nil
+	}
+	isNewProposer := s.isNewProposer(proposingSlot)
+	if isNewProposer && !features.Get().DisableReorgLateBlocks {
+		if s.shouldOverrideFCU(newHeadRoot, proposingSlot) {
+			return false, nil
+		}
+	}
+	headState, headBlock, err := s.getStateAndBlock(ctx, newHeadRoot)
 	if err != nil {
-		return errors.Wrap(err, "could not notify forkchoice update")
+		log.WithError(err).Error("Could not get forkchoice update argument")
+		return false, nil
 	}

-	if err := s.saveHead(ctx, args.headRoot, args.headBlock, args.headState); err != nil {
+	_, err = s.notifyForkchoiceUpdate(ctx, &notifyForkchoiceUpdateArg{
+		headState: headState,
+		headRoot:  newHeadRoot,
+		headBlock: headBlock.Block(),
+	})
+	if err != nil {
+		return false, errors.Wrap(err, "could not notify forkchoice update")
+	}
+
+	if err := s.saveHead(ctx, newHeadRoot, headBlock, headState); err != nil {
 		log.WithError(err).Error("could not save head")
 	}

 	// Only need to prune attestations from pool if the head has changed.
-	if err := s.pruneAttsFromPool(args.headBlock); err != nil {
+	if err := s.pruneAttsFromPool(headBlock); err != nil {
 		log.WithError(err).Error("could not prune attestations from pool")
 	}
-	return nil
+	return true, nil
 }

 // shouldOverrideFCU checks whether the incoming block is still subject to being
--- a/beacon-chain/blockchain/forkchoice_update_execution_test.go
+++ b/beacon-chain/blockchain/forkchoice_update_execution_test.go
@@ -17,6 +17,15 @@ import (
 	logTest "github.com/sirupsen/logrus/hooks/test"
 )

+func TestService_isNewProposer(t *testing.T) {
+	beaconDB := testDB.SetupDB(t)
+	service := setupBeaconChain(t, beaconDB)
+	require.Equal(t, false, service.isNewProposer(service.CurrentSlot()+1))
+
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(service.CurrentSlot()+1, 0, [8]byte{}, [32]byte{} /* root */)
+	require.Equal(t, true, service.isNewProposer(service.CurrentSlot()+1))
+}
+
 func TestService_isNewHead(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	service := setupBeaconChain(t, beaconDB)
@@ -58,14 +67,33 @@ func TestService_getHeadStateAndBlock(t *testing.T) {
 }

 func TestService_forkchoiceUpdateWithExecution_exceptionalCases(t *testing.T) {
+	hook := logTest.NewGlobal()
 	ctx := context.Background()
 	opts := testServiceOptsWithDB(t)

 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	service.cfg.PayloadIDCache = cache.NewPayloadIDCache()
-	service.cfg.TrackedValidatorsCache = cache.NewTrackedValidatorsCache()
+	service.cfg.ProposerSlotIndexCache = cache.NewProposerPayloadIDsCache()
+	_, err = service.forkchoiceUpdateWithExecution(ctx, service.headRoot(), service.CurrentSlot()+1)
+	require.NoError(t, err)
+	hookErr := "could not notify forkchoice update"
+	invalidStateErr := "could not get state summary: could not find block in DB"
+	require.LogsDoNotContain(t, hook, invalidStateErr)
+	require.LogsDoNotContain(t, hook, hookErr)
+	gb, err := blocks.NewSignedBeaconBlock(util.NewBeaconBlock())
+	require.NoError(t, err)
+	require.NoError(t, service.saveInitSyncBlock(ctx, [32]byte{'a'}, gb))
+	_, err = service.forkchoiceUpdateWithExecution(ctx, [32]byte{'a'}, service.CurrentSlot()+1)
+	require.NoError(t, err)
+	require.LogsContain(t, hook, invalidStateErr)

+	hook.Reset()
+	service.head = &head{
+		root:  [32]byte{'a'},
+		block: nil, /* should not panic if notify head uses correct head */
+	}
+
+	// Block in Cache
 	b := util.NewBeaconBlock()
 	b.Block.Slot = 2
 	wsb, err := blocks.NewSignedBeaconBlock(b)
@@ -79,7 +107,13 @@ func TestService_forkchoiceUpdateWithExecution_exceptionalCases(t *testing.T) {
 		block: wsb,
 		state: st,
 	}
-	service.cfg.PayloadIDCache.Set(2, [32]byte{2}, [8]byte{1})
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(2, 1, [8]byte{1}, [32]byte{2})
+	_, err = service.forkchoiceUpdateWithExecution(ctx, r1, service.CurrentSlot())
+	require.NoError(t, err)
+	require.LogsDoNotContain(t, hook, invalidStateErr)
+	require.LogsDoNotContain(t, hook, hookErr)
+
+	// Block in DB
 	b = util.NewBeaconBlock()
 	b.Block.Slot = 3
 	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b)
@@ -91,22 +125,25 @@ func TestService_forkchoiceUpdateWithExecution_exceptionalCases(t *testing.T) {
 		block: wsb,
 		state: st,
 	}
-	service.cfg.PayloadIDCache.Set(2, [32]byte{2}, [8]byte{1})
-	args := &fcuConfig{
-		headState:     st,
-		headRoot:      r1,
-		headBlock:     wsb,
-		proposingSlot: service.CurrentSlot() + 1,
-	}
-	require.NoError(t, service.forkchoiceUpdateWithExecution(ctx, args))
-
-	payloadID, has := service.cfg.PayloadIDCache.PayloadID(2, [32]byte{2})
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(2, 1, [8]byte{1}, [32]byte{2})
+	_, err = service.forkchoiceUpdateWithExecution(ctx, r1, service.CurrentSlot()+1)
+	require.NoError(t, err)
+	require.LogsDoNotContain(t, hook, invalidStateErr)
+	require.LogsDoNotContain(t, hook, hookErr)
+	vId, payloadID, has := service.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(2, [32]byte{2})
 	require.Equal(t, true, has)
-	require.Equal(t, primitives.PayloadID{1}, payloadID)
+	require.Equal(t, primitives.ValidatorIndex(1), vId)
+	require.Equal(t, [8]byte{1}, payloadID)
+
+	// Test zero headRoot returns immediately.
+	headRoot := service.headRoot()
+	_, err = service.forkchoiceUpdateWithExecution(ctx, [32]byte{}, service.CurrentSlot()+1)
+	require.NoError(t, err)
+	require.Equal(t, service.headRoot(), headRoot)
 }

 func TestService_forkchoiceUpdateWithExecution_SameHeadRootNewProposer(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t)
 	ctx, beaconDB, fcs := tr.ctx, tr.db, tr.fcs

 	altairBlk := util.SaveBlock(t, ctx, beaconDB, util.NewBeaconBlockAltair())
@@ -145,14 +182,10 @@ func TestService_forkchoiceUpdateWithExecution_SameHeadRootNewProposer(t *testin
 	service.head.root = r
 	service.head.block = sb
 	service.head.state = st
-	service.cfg.PayloadIDCache.Set(service.CurrentSlot()+1, [32]byte{} /* root */, [8]byte{})
-	args := &fcuConfig{
-		headState:     st,
-		headBlock:     sb,
-		headRoot:      r,
-		proposingSlot: service.CurrentSlot() + 1,
-	}
-	require.NoError(t, service.forkchoiceUpdateWithExecution(ctx, args))
+	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(service.CurrentSlot()+1, 0, [8]byte{}, [32]byte{} /* root */)
+	_, err = service.forkchoiceUpdateWithExecution(ctx, r, service.CurrentSlot()+1)
+	require.NoError(t, err)
+
 }

 func TestShouldOverrideFCU(t *testing.T) {
--- 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")
 	}

@@ -182,7 +173,7 @@ func (s *Service) saveHead(ctx context.Context, newHeadRoot [32]byte, headBlock
 // This gets called to update canonical root mapping. It does not save head block
 // root in DB. With the inception of initial-sync-cache-state flag, it uses finalized
 // check point as anchors to resume sync therefore head is no longer needed to be saved on per slot basis.
-func (s *Service) saveHeadNoDB(ctx context.Context, b interfaces.ReadOnlySignedBeaconBlock, r [32]byte, hs state.BeaconState, optimistic bool) error {
+func (s *Service) saveHeadNoDB(ctx context.Context, b interfaces.ReadOnlySignedBeaconBlock, r [32]byte, hs state.BeaconState) error {
 	if err := blocks.BeaconBlockIsNil(b); err != nil {
 		return err
 	}
@@ -198,28 +189,26 @@ func (s *Service) saveHeadNoDB(ctx context.Context, b interfaces.ReadOnlySignedB
 	if err != nil {
 		return err
 	}
-	if err := s.setHeadInitialSync(r, bCp, hs, optimistic); err != nil {
+	if err := s.setHeadInitialSync(r, bCp, hs); err != nil {
 		return errors.Wrap(err, "could not set head")
 	}
 	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
 }
@@ -227,7 +216,7 @@ func (s *Service) setHead(newHead *head) error {
 // This sets head view object which is used to track the head slot, root, block and state. The method
 // assumes that state being passed into the method will not be modified by any other alternate
 // caller which holds the state's reference.
-func (s *Service) setHeadInitialSync(root [32]byte, block interfaces.ReadOnlySignedBeaconBlock, state state.BeaconState, optimistic bool) error {
+func (s *Service) setHeadInitialSync(root [32]byte, block interfaces.ReadOnlySignedBeaconBlock, state state.BeaconState) error {
 	s.headLock.Lock()
 	defer s.headLock.Unlock()

@@ -237,10 +226,9 @@ func (s *Service) setHeadInitialSync(root [32]byte, block interfaces.ReadOnlySig
 		return err
 	}
 	s.head = &head{
-		root:       root,
-		block:      bCp,
-		state:      state,
-		optimistic: optimistic,
+		root:  root,
+		block: bCp,
+		state: state,
 	}
 	return nil
 }
@@ -276,7 +264,7 @@ func (s *Service) headBlock() (interfaces.ReadOnlySignedBeaconBlock, error) {
 // It does a full copy on head state for immutability.
 // This is a lock free version.
 func (s *Service) headState(ctx context.Context) state.BeaconState {
-	_, span := trace.StartSpan(ctx, "blockChain.headState")
+	ctx, span := trace.StartSpan(ctx, "blockChain.headState")
 	defer span.End()

 	return s.head.state.Copy()
@@ -286,7 +274,7 @@ func (s *Service) headState(ctx context.Context) state.BeaconState {
 // It does not perform a copy of the head state.
 // This is a lock free version.
 func (s *Service) headStateReadOnly(ctx context.Context) state.ReadOnlyBeaconState {
-	_, span := trace.StartSpan(ctx, "blockChain.headStateReadOnly")
+	ctx, span := trace.StartSpan(ctx, "blockChain.headStateReadOnly")
 	defer span.End()

 	return s.head.state
--- a/beacon-chain/blockchain/head_sync_committee_info.go
+++ b/beacon-chain/blockchain/head_sync_committee_info.go
@@ -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/kzg/BUILD.bazel
+++ b/beacon-chain/blockchain/kzg/BUILD.bazel
@@ -1,33 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library", "go_test")
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "trusted_setup.go",
-        "validation.go",
-    ],
-    embedsrcs = ["trusted_setup.json"],
-    importpath = "github.com/prysmaticlabs/prysm/v4/beacon-chain/blockchain/kzg",
-    visibility = ["//visibility:public"],
-    deps = [
-        "//consensus-types/blocks:go_default_library",
-        "@com_github_crate_crypto_go_kzg_4844//:go_default_library",
-        "@com_github_pkg_errors//:go_default_library",
-    ],
-)
-
-go_test(
-    name = "go_default_test",
-    srcs = [
-        "trusted_setup_test.go",
-        "validation_test.go",
-    ],
-    embed = [":go_default_library"],
-    deps = [
-        "//consensus-types/blocks:go_default_library",
-        "//testing/require:go_default_library",
-        "@com_github_consensys_gnark_crypto//ecc/bls12-381/fr:go_default_library",
-        "@com_github_crate_crypto_go_kzg_4844//:go_default_library",
-        "@com_github_sirupsen_logrus//:go_default_library",
-    ],
-)
--- a/beacon-chain/blockchain/kzg/trusted_setup.go
+++ b/beacon-chain/blockchain/kzg/trusted_setup.go
@@ -1,28 +0,0 @@
-package kzg
-
-import (
-	_ "embed"
-	"encoding/json"
-
-	GoKZG "github.com/crate-crypto/go-kzg-4844"
-	"github.com/pkg/errors"
-)
-
-var (
-	//go:embed trusted_setup.json
-	embeddedTrustedSetup []byte // 1.2Mb
-	kzgContext           *GoKZG.Context
-)
-
-func Start() error {
-	parsedSetup := GoKZG.JSONTrustedSetup{}
-	err := json.Unmarshal(embeddedTrustedSetup, &parsedSetup)
-	if err != nil {
-		return errors.Wrap(err, "could not parse trusted setup JSON")
-	}
-	kzgContext, err = GoKZG.NewContext4096(&parsedSetup)
-	if err != nil {
-		return errors.Wrap(err, "could not initialize go-kzg context")
-	}
-	return nil
-}
--- a/beacon-chain/blockchain/kzg/trusted_setup.json
+++ b/beacon-chain/blockchain/kzg/trusted_setup.json
--- a/beacon-chain/blockchain/kzg/trusted_setup_test.go
+++ b/beacon-chain/blockchain/kzg/trusted_setup_test.go
@@ -1,12 +0,0 @@
-package kzg
-
-import (
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v4/testing/require"
-)
-
-func TestStart(t *testing.T) {
-	require.NoError(t, Start())
-	require.NotNil(t, kzgContext)
-}
--- a/beacon-chain/blockchain/kzg/validation.go
+++ b/beacon-chain/blockchain/kzg/validation.go
@@ -1,43 +0,0 @@
-package kzg
-
-import (
-	GoKZG "github.com/crate-crypto/go-kzg-4844"
-	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
-)
-
-// Verify performs single or batch verification of commitments depending on the number of given BlobSidecars.
-func Verify(sidecars ...blocks.ROBlob) error {
-	if len(sidecars) == 0 {
-		return nil
-	}
-	if len(sidecars) == 1 {
-		return kzgContext.VerifyBlobKZGProof(
-			bytesToBlob(sidecars[0].Blob),
-			bytesToCommitment(sidecars[0].KzgCommitment),
-			bytesToKZGProof(sidecars[0].KzgProof))
-	}
-	blobs := make([]GoKZG.Blob, len(sidecars))
-	cmts := make([]GoKZG.KZGCommitment, len(sidecars))
-	proofs := make([]GoKZG.KZGProof, len(sidecars))
-	for i, sidecar := range sidecars {
-		blobs[i] = bytesToBlob(sidecar.Blob)
-		cmts[i] = bytesToCommitment(sidecar.KzgCommitment)
-		proofs[i] = bytesToKZGProof(sidecar.KzgProof)
-	}
-	return kzgContext.VerifyBlobKZGProofBatch(blobs, cmts, proofs)
-}
-
-func bytesToBlob(blob []byte) (ret GoKZG.Blob) {
-	copy(ret[:], blob)
-	return
-}
-
-func bytesToCommitment(commitment []byte) (ret GoKZG.KZGCommitment) {
-	copy(ret[:], commitment)
-	return
-}
-
-func bytesToKZGProof(proof []byte) (ret GoKZG.KZGProof) {
-	copy(ret[:], proof)
-	return
-}
--- a/beacon-chain/blockchain/kzg/validation_test.go
+++ b/beacon-chain/blockchain/kzg/validation_test.go
@@ -1,84 +0,0 @@
-package kzg
-
-import (
-	"bytes"
-	"crypto/sha256"
-	"encoding/binary"
-	"testing"
-
-	"github.com/consensys/gnark-crypto/ecc/bls12-381/fr"
-	GoKZG "github.com/crate-crypto/go-kzg-4844"
-	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v4/testing/require"
-	"github.com/sirupsen/logrus"
-)
-
-func deterministicRandomness(seed int64) [32]byte {
-	// Converts an int64 to a byte slice
-	buf := new(bytes.Buffer)
-	err := binary.Write(buf, binary.BigEndian, seed)
-	if err != nil {
-		logrus.WithError(err).Error("Failed to write int64 to bytes buffer")
-		return [32]byte{}
-	}
-	bytes := buf.Bytes()
-
-	return sha256.Sum256(bytes)
-}
-
-// Returns a serialized random field element in big-endian
-func GetRandFieldElement(seed int64) [32]byte {
-	bytes := deterministicRandomness(seed)
-	var r fr.Element
-	r.SetBytes(bytes[:])
-
-	return GoKZG.SerializeScalar(r)
-}
-
-// Returns a random blob using the passed seed as entropy
-func GetRandBlob(seed int64) GoKZG.Blob {
-	var blob GoKZG.Blob
-	bytesPerBlob := GoKZG.ScalarsPerBlob * GoKZG.SerializedScalarSize
-	for i := 0; i < bytesPerBlob; i += GoKZG.SerializedScalarSize {
-		fieldElementBytes := GetRandFieldElement(seed + int64(i))
-		copy(blob[i:i+GoKZG.SerializedScalarSize], fieldElementBytes[:])
-	}
-	return blob
-}
-
-func GenerateCommitmentAndProof(blob GoKZG.Blob) (GoKZG.KZGCommitment, GoKZG.KZGProof, error) {
-	commitment, err := kzgContext.BlobToKZGCommitment(blob, 0)
-	if err != nil {
-		return GoKZG.KZGCommitment{}, GoKZG.KZGProof{}, err
-	}
-	proof, err := kzgContext.ComputeBlobKZGProof(blob, commitment, 0)
-	if err != nil {
-		return GoKZG.KZGCommitment{}, GoKZG.KZGProof{}, err
-	}
-	return commitment, proof, err
-}
-
-func TestVerify(t *testing.T) {
-	sidecars := make([]blocks.ROBlob, 0)
-	require.NoError(t, Verify(sidecars...))
-}
-
-func TestBytesToAny(t *testing.T) {
-	bytes := []byte{0x01, 0x02}
-	blob := GoKZG.Blob{0x01, 0x02}
-	commitment := GoKZG.KZGCommitment{0x01, 0x02}
-	proof := GoKZG.KZGProof{0x01, 0x02}
-	require.DeepEqual(t, blob, bytesToBlob(bytes))
-	require.DeepEqual(t, commitment, bytesToCommitment(bytes))
-	require.DeepEqual(t, proof, bytesToKZGProof(bytes))
-}
-
-func TestGenerateCommitmentAndProof(t *testing.T) {
-	blob := GetRandBlob(123)
-	commitment, proof, err := GenerateCommitmentAndProof(blob)
-	require.NoError(t, err)
-	expectedCommitment := GoKZG.KZGCommitment{180, 218, 156, 194, 59, 20, 10, 189, 186, 254, 132, 93, 7, 127, 104, 172, 238, 240, 237, 70, 83, 89, 1, 152, 99, 0, 165, 65, 143, 62, 20, 215, 230, 14, 205, 95, 28, 245, 54, 25, 160, 16, 178, 31, 232, 207, 38, 85}
-	expectedProof := GoKZG.KZGProof{128, 110, 116, 170, 56, 111, 126, 87, 229, 234, 211, 42, 110, 150, 129, 206, 73, 142, 167, 243, 90, 149, 240, 240, 236, 204, 143, 182, 229, 249, 81, 27, 153, 171, 83, 70, 144, 250, 42, 1, 188, 215, 71, 235, 30, 7, 175, 86}
-	require.Equal(t, expectedCommitment, commitment)
-	require.Equal(t, expectedProof, proof)
-}
--- a/beacon-chain/blockchain/lightclient.go
+++ b/beacon-chain/blockchain/lightclient.go
@@ -1,245 +0,0 @@
-package blockchain
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/v4/config/params"
-	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
-	ethpbv1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"
-	ethpbv2 "github.com/prysmaticlabs/prysm/v4/proto/eth/v2"
-	"github.com/prysmaticlabs/prysm/v4/proto/migration"
-	"github.com/prysmaticlabs/prysm/v4/time/slots"
-)
-
-const (
-	finalityBranchNumOfLeaves = 6
-)
-
-// CreateLightClientFinalityUpdate - implements https://github.com/ethereum/consensus-specs/blob/3d235740e5f1e641d3b160c8688f26e7dc5a1894/specs/altair/light-client/full-node.md#create_light_client_finality_update
-// def create_light_client_finality_update(update: LightClientUpdate) -> LightClientFinalityUpdate:
-//
-//	return LightClientFinalityUpdate(
-//	    attested_header=update.attested_header,
-//	    finalized_header=update.finalized_header,
-//	    finality_branch=update.finality_branch,
-//	    sync_aggregate=update.sync_aggregate,
-//	    signature_slot=update.signature_slot,
-//	)
-func CreateLightClientFinalityUpdate(update *ethpbv2.LightClientUpdate) *ethpbv2.LightClientFinalityUpdate {
-	return &ethpbv2.LightClientFinalityUpdate{
-		AttestedHeader:  update.AttestedHeader,
-		FinalizedHeader: update.FinalizedHeader,
-		FinalityBranch:  update.FinalityBranch,
-		SyncAggregate:   update.SyncAggregate,
-		SignatureSlot:   update.SignatureSlot,
-	}
-}
-
-// CreateLightClientOptimisticUpdate - implements https://github.com/ethereum/consensus-specs/blob/3d235740e5f1e641d3b160c8688f26e7dc5a1894/specs/altair/light-client/full-node.md#create_light_client_optimistic_update
-// def create_light_client_optimistic_update(update: LightClientUpdate) -> LightClientOptimisticUpdate:
-//
-//	return LightClientOptimisticUpdate(
-//	    attested_header=update.attested_header,
-//	    sync_aggregate=update.sync_aggregate,
-//	    signature_slot=update.signature_slot,
-//	)
-func CreateLightClientOptimisticUpdate(update *ethpbv2.LightClientUpdate) *ethpbv2.LightClientOptimisticUpdate {
-	return &ethpbv2.LightClientOptimisticUpdate{
-		AttestedHeader: update.AttestedHeader,
-		SyncAggregate:  update.SyncAggregate,
-		SignatureSlot:  update.SignatureSlot,
-	}
-}
-
-func NewLightClientOptimisticUpdateFromBeaconState(
-	ctx context.Context,
-	state state.BeaconState,
-	block interfaces.ReadOnlySignedBeaconBlock,
-	attestedState state.BeaconState) (*ethpbv2.LightClientUpdate, error) {
-	// assert compute_epoch_at_slot(attested_state.slot) >= ALTAIR_FORK_EPOCH
-	attestedEpoch := slots.ToEpoch(attestedState.Slot())
-	if attestedEpoch < params.BeaconConfig().AltairForkEpoch {
-		return nil, fmt.Errorf("invalid attested epoch %d", attestedEpoch)
-	}
-
-	// assert sum(block.message.body.sync_aggregate.sync_committee_bits) >= MIN_SYNC_COMMITTEE_PARTICIPANTS
-	syncAggregate, err := block.Block().Body().SyncAggregate()
-	if err != nil {
-		return nil, fmt.Errorf("could not get sync aggregate %v", err)
-	}
-
-	if syncAggregate.SyncCommitteeBits.Count() < params.BeaconConfig().MinSyncCommitteeParticipants {
-		return nil, fmt.Errorf("invalid sync committee bits count %d", syncAggregate.SyncCommitteeBits.Count())
-	}
-
-	// assert state.slot == state.latest_block_header.slot
-	if state.Slot() != state.LatestBlockHeader().Slot {
-		return nil, fmt.Errorf("state slot %d not equal to latest block header slot %d", state.Slot(), state.LatestBlockHeader().Slot)
-	}
-
-	// assert hash_tree_root(header) == hash_tree_root(block.message)
-	header := state.LatestBlockHeader()
-	stateRoot, err := state.HashTreeRoot(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("could not get state root %v", err)
-	}
-	header.StateRoot = stateRoot[:]
-
-	headerRoot, err := header.HashTreeRoot()
-	if err != nil {
-		return nil, fmt.Errorf("could not get header root %v", err)
-	}
-
-	blockRoot, err := block.Block().HashTreeRoot()
-	if err != nil {
-		return nil, fmt.Errorf("could not get block root %v", err)
-	}
-
-	if headerRoot != blockRoot {
-		return nil, fmt.Errorf("header root %#x not equal to block root %#x", headerRoot, blockRoot)
-	}
-
-	// assert attested_state.slot == attested_state.latest_block_header.slot
-	if attestedState.Slot() != attestedState.LatestBlockHeader().Slot {
-		return nil, fmt.Errorf("attested state slot %d not equal to attested latest block header slot %d", attestedState.Slot(), attestedState.LatestBlockHeader().Slot)
-	}
-
-	// attested_header = attested_state.latest_block_header.copy()
-	attestedHeader := attestedState.LatestBlockHeader()
-
-	// attested_header.state_root = hash_tree_root(attested_state)
-	attestedStateRoot, err := attestedState.HashTreeRoot(ctx)
-	if err != nil {
-		return nil, fmt.Errorf("could not get attested state root %v", err)
-	}
-	attestedHeader.StateRoot = attestedStateRoot[:]
-
-	// assert hash_tree_root(attested_header) == block.message.parent_root
-	attestedHeaderRoot, err := attestedHeader.HashTreeRoot()
-	if err != nil {
-		return nil, fmt.Errorf("could not get attested header root %v", err)
-	}
-
-	if attestedHeaderRoot != block.Block().ParentRoot() {
-		return nil, fmt.Errorf("attested header root %#x not equal to block parent root %#x", attestedHeaderRoot, block.Block().ParentRoot())
-	}
-
-	// Return result
-	attestedHeaderResult := &ethpbv1.BeaconBlockHeader{
-		Slot:          attestedHeader.Slot,
-		ProposerIndex: attestedHeader.ProposerIndex,
-		ParentRoot:    attestedHeader.ParentRoot,
-		StateRoot:     attestedHeader.StateRoot,
-		BodyRoot:      attestedHeader.BodyRoot,
-	}
-
-	syncAggregateResult := &ethpbv1.SyncAggregate{
-		SyncCommitteeBits:      syncAggregate.SyncCommitteeBits,
-		SyncCommitteeSignature: syncAggregate.SyncCommitteeSignature,
-	}
-
-	result := &ethpbv2.LightClientUpdate{
-		AttestedHeader: attestedHeaderResult,
-		SyncAggregate:  syncAggregateResult,
-		SignatureSlot:  block.Block().Slot(),
-	}
-
-	return result, nil
-}
-
-func NewLightClientFinalityUpdateFromBeaconState(
-	ctx context.Context,
-	state state.BeaconState,
-	block interfaces.ReadOnlySignedBeaconBlock,
-	attestedState state.BeaconState,
-	finalizedBlock interfaces.ReadOnlySignedBeaconBlock) (*ethpbv2.LightClientUpdate, error) {
-	result, err := NewLightClientOptimisticUpdateFromBeaconState(
-		ctx,
-		state,
-		block,
-		attestedState,
-	)
-	if err != nil {
-		return nil, err
-	}
-
-	// Indicate finality whenever possible
-	var finalizedHeader *ethpbv1.BeaconBlockHeader
-	var finalityBranch [][]byte
-
-	if finalizedBlock != nil && !finalizedBlock.IsNil() {
-		if finalizedBlock.Block().Slot() != 0 {
-			tempFinalizedHeader, err := finalizedBlock.Header()
-			if err != nil {
-				return nil, fmt.Errorf("could not get finalized header %v", err)
-			}
-			finalizedHeader = migration.V1Alpha1SignedHeaderToV1(tempFinalizedHeader).GetMessage()
-
-			finalizedHeaderRoot, err := finalizedHeader.HashTreeRoot()
-			if err != nil {
-				return nil, fmt.Errorf("could not get finalized header root %v", err)
-			}
-
-			if finalizedHeaderRoot != bytesutil.ToBytes32(attestedState.FinalizedCheckpoint().Root) {
-				return nil, fmt.Errorf("finalized header root %#x not equal to attested finalized checkpoint root %#x", finalizedHeaderRoot, bytesutil.ToBytes32(attestedState.FinalizedCheckpoint().Root))
-			}
-		} else {
-			if !bytes.Equal(attestedState.FinalizedCheckpoint().Root, make([]byte, 32)) {
-				return nil, fmt.Errorf("invalid finalized header root %v", attestedState.FinalizedCheckpoint().Root)
-			}
-
-			finalizedHeader = &ethpbv1.BeaconBlockHeader{
-				Slot:          0,
-				ProposerIndex: 0,
-				ParentRoot:    make([]byte, 32),
-				StateRoot:     make([]byte, 32),
-				BodyRoot:      make([]byte, 32),
-			}
-		}
-
-		var bErr error
-		finalityBranch, bErr = attestedState.FinalizedRootProof(ctx)
-		if bErr != nil {
-			return nil, fmt.Errorf("could not get finalized root proof %v", bErr)
-		}
-	} else {
-		finalizedHeader = &ethpbv1.BeaconBlockHeader{
-			Slot:          0,
-			ProposerIndex: 0,
-			ParentRoot:    make([]byte, 32),
-			StateRoot:     make([]byte, 32),
-			BodyRoot:      make([]byte, 32),
-		}
-
-		finalityBranch = make([][]byte, finalityBranchNumOfLeaves)
-		for i := 0; i < finalityBranchNumOfLeaves; i++ {
-			finalityBranch[i] = make([]byte, 32)
-		}
-	}
-
-	result.FinalizedHeader = finalizedHeader
-	result.FinalityBranch = finalityBranch
-	return result, nil
-}
-
-func NewLightClientUpdateFromFinalityUpdate(update *ethpbv2.LightClientFinalityUpdate) *ethpbv2.LightClientUpdate {
-	return &ethpbv2.LightClientUpdate{
-		AttestedHeader:  update.AttestedHeader,
-		FinalizedHeader: update.FinalizedHeader,
-		FinalityBranch:  update.FinalityBranch,
-		SyncAggregate:   update.SyncAggregate,
-		SignatureSlot:   update.SignatureSlot,
-	}
-}
-
-func NewLightClientUpdateFromOptimisticUpdate(update *ethpbv2.LightClientOptimisticUpdate) *ethpbv2.LightClientUpdate {
-	return &ethpbv2.LightClientUpdate{
-		AttestedHeader: update.AttestedHeader,
-		SyncAggregate:  update.SyncAggregate,
-		SignatureSlot:  update.SignatureSlot,
-	}
-}
--- a/beacon-chain/blockchain/lightclient_test.go
+++ b/beacon-chain/blockchain/lightclient_test.go
@@ -1,160 +0,0 @@
-package blockchain
-
-import (
-	"context"
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/v4/config/params"
-	"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
-	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
-	v1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"
-	ethpbv2 "github.com/prysmaticlabs/prysm/v4/proto/eth/v2"
-	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v4/testing/require"
-	"github.com/prysmaticlabs/prysm/v4/testing/util"
-)
-
-type testlc struct {
-	t              *testing.T
-	ctx            context.Context
-	state          state.BeaconState
-	block          interfaces.ReadOnlySignedBeaconBlock
-	attestedState  state.BeaconState
-	attestedHeader *ethpb.BeaconBlockHeader
-}
-
-func newTestLc(t *testing.T) *testlc {
-	return &testlc{t: t}
-}
-
-func (l *testlc) setupTest() *testlc {
-	ctx := context.Background()
-
-	slot := primitives.Slot(params.BeaconConfig().AltairForkEpoch * primitives.Epoch(params.BeaconConfig().SlotsPerEpoch)).Add(1)
-
-	attestedState, err := util.NewBeaconStateCapella()
-	require.NoError(l.t, err)
-	err = attestedState.SetSlot(slot)
-	require.NoError(l.t, err)
-
-	parent := util.NewBeaconBlockCapella()
-	parent.Block.Slot = slot
-
-	signedParent, err := blocks.NewSignedBeaconBlock(parent)
-	require.NoError(l.t, err)
-
-	parentHeader, err := signedParent.Header()
-	require.NoError(l.t, err)
-	attestedHeader := parentHeader.Header
-
-	err = attestedState.SetLatestBlockHeader(attestedHeader)
-	require.NoError(l.t, err)
-	attestedStateRoot, err := attestedState.HashTreeRoot(ctx)
-	require.NoError(l.t, err)
-
-	// get a new signed block so the root is updated with the new state root
-	parent.Block.StateRoot = attestedStateRoot[:]
-	signedParent, err = blocks.NewSignedBeaconBlock(parent)
-	require.NoError(l.t, err)
-
-	state, err := util.NewBeaconStateCapella()
-	require.NoError(l.t, err)
-	err = state.SetSlot(slot)
-	require.NoError(l.t, err)
-
-	parentRoot, err := signedParent.Block().HashTreeRoot()
-	require.NoError(l.t, err)
-
-	block := util.NewBeaconBlockCapella()
-	block.Block.Slot = slot
-	block.Block.ParentRoot = parentRoot[:]
-
-	for i := uint64(0); i < params.BeaconConfig().MinSyncCommitteeParticipants; i++ {
-		block.Block.Body.SyncAggregate.SyncCommitteeBits.SetBitAt(i, true)
-	}
-
-	signedBlock, err := blocks.NewSignedBeaconBlock(block)
-	require.NoError(l.t, err)
-
-	h, err := signedBlock.Header()
-	require.NoError(l.t, err)
-
-	err = state.SetLatestBlockHeader(h.Header)
-	require.NoError(l.t, err)
-	stateRoot, err := state.HashTreeRoot(ctx)
-	require.NoError(l.t, err)
-
-	// get a new signed block so the root is updated with the new state root
-	block.Block.StateRoot = stateRoot[:]
-	signedBlock, err = blocks.NewSignedBeaconBlock(block)
-	require.NoError(l.t, err)
-
-	l.state = state
-	l.attestedState = attestedState
-	l.attestedHeader = attestedHeader
-	l.block = signedBlock
-	l.ctx = ctx
-
-	return l
-}
-
-func (l *testlc) checkAttestedHeader(update *ethpbv2.LightClientUpdate) {
-	require.Equal(l.t, l.attestedHeader.Slot, update.AttestedHeader.Slot, "Attested header slot is not equal")
-	require.Equal(l.t, l.attestedHeader.ProposerIndex, update.AttestedHeader.ProposerIndex, "Attested header proposer index is not equal")
-	require.DeepSSZEqual(l.t, l.attestedHeader.ParentRoot, update.AttestedHeader.ParentRoot, "Attested header parent root is not equal")
-	require.DeepSSZEqual(l.t, l.attestedHeader.BodyRoot, update.AttestedHeader.BodyRoot, "Attested header body root is not equal")
-
-	attestedStateRoot, err := l.attestedState.HashTreeRoot(l.ctx)
-	require.NoError(l.t, err)
-	require.DeepSSZEqual(l.t, attestedStateRoot[:], update.AttestedHeader.StateRoot, "Attested header state root is not equal")
-}
-
-func (l *testlc) checkSyncAggregate(update *ethpbv2.LightClientUpdate) {
-	syncAggregate, err := l.block.Block().Body().SyncAggregate()
-	require.NoError(l.t, err)
-	require.DeepSSZEqual(l.t, syncAggregate.SyncCommitteeBits, update.SyncAggregate.SyncCommitteeBits, "SyncAggregate bits is not equal")
-	require.DeepSSZEqual(l.t, syncAggregate.SyncCommitteeSignature, update.SyncAggregate.SyncCommitteeSignature, "SyncAggregate signature is not equal")
-}
-
-func TestLightClient_NewLightClientOptimisticUpdateFromBeaconState(t *testing.T) {
-	l := newTestLc(t).setupTest()
-
-	update, err := NewLightClientOptimisticUpdateFromBeaconState(l.ctx, l.state, l.block, l.attestedState)
-	require.NoError(t, err)
-	require.NotNil(t, update, "update is nil")
-
-	require.Equal(t, l.block.Block().Slot(), update.SignatureSlot, "Signature slot is not equal")
-
-	l.checkSyncAggregate(update)
-	l.checkAttestedHeader(update)
-
-	require.Equal(t, (*v1.BeaconBlockHeader)(nil), update.FinalizedHeader, "Finalized header is not nil")
-	require.DeepSSZEqual(t, ([][]byte)(nil), update.FinalityBranch, "Finality branch is not nil")
-}
-
-func TestLightClient_NewLightClientFinalityUpdateFromBeaconState(t *testing.T) {
-	l := newTestLc(t).setupTest()
-
-	update, err := NewLightClientFinalityUpdateFromBeaconState(l.ctx, l.state, l.block, l.attestedState, nil)
-	require.NoError(t, err)
-	require.NotNil(t, update, "update is nil")
-
-	require.Equal(t, l.block.Block().Slot(), update.SignatureSlot, "Signature slot is not equal")
-
-	l.checkSyncAggregate(update)
-	l.checkAttestedHeader(update)
-
-	zeroHash := params.BeaconConfig().ZeroHash[:]
-	require.NotNil(t, update.FinalizedHeader, "Finalized header is nil")
-	require.Equal(t, primitives.Slot(0), update.FinalizedHeader.Slot, "Finalized header slot is not zero")
-	require.Equal(t, primitives.ValidatorIndex(0), update.FinalizedHeader.ProposerIndex, "Finalized header proposer index is not zero")
-	require.DeepSSZEqual(t, zeroHash, update.FinalizedHeader.ParentRoot, "Finalized header parent root is not zero")
-	require.DeepSSZEqual(t, zeroHash, update.FinalizedHeader.StateRoot, "Finalized header state root is not zero")
-	require.DeepSSZEqual(t, zeroHash, update.FinalizedHeader.BodyRoot, "Finalized header body root is not zero")
-	require.Equal(t, finalityBranchNumOfLeaves, len(update.FinalityBranch), "Invalid finality branch leaves")
-	for _, leaf := range update.FinalityBranch {
-		require.DeepSSZEqual(t, zeroHash, leaf, "Leaf is not zero")
-	}
-}
--- 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:
@@ -61,19 +61,11 @@ func logStateTransitionData(b interfaces.ReadOnlyBeaconBlock) error {
 			txsPerSlotCount.Set(float64(len(txs)))
 		}
 	}
-	if b.Version() >= version.Deneb {
-		kzgs, err := b.Body().BlobKzgCommitments()
-		if err != nil {
-			log.WithError(err).Error("Failed to get blob KZG commitments")
-		} else if len(kzgs) > 0 {
-			log = log.WithField("kzgCommitmentCount", len(kzgs))
-		}
-	}
 	log.Info("Finished applying state transition")
 	return nil
 }

-func logBlockSyncStatus(block interfaces.ReadOnlyBeaconBlock, blockRoot [32]byte, justified, finalized *ethpb.Checkpoint, receivedTime time.Time, genesisTime uint64, daWaitedTime time.Duration) error {
+func logBlockSyncStatus(block interfaces.ReadOnlyBeaconBlock, blockRoot [32]byte, justified, finalized *ethpb.Checkpoint, receivedTime time.Time, genesisTime uint64) error {
 	startTime, err := slots.ToTime(genesisTime, block.Slot())
 	if err != nil {
 		return err
@@ -81,7 +73,7 @@ func logBlockSyncStatus(block interfaces.ReadOnlyBeaconBlock, blockRoot [32]byte
 	level := log.Logger.GetLevel()
 	if level >= logrus.DebugLevel {
 		parentRoot := block.ParentRoot()
-		lf := logrus.Fields{
+		log.WithFields(logrus.Fields{
 			"slot":                      block.Slot(),
 			"slotInEpoch":               block.Slot() % params.BeaconConfig().SlotsPerEpoch,
 			"block":                     fmt.Sprintf("0x%s...", hex.EncodeToString(blockRoot[:])[:8]),
@@ -93,10 +85,9 @@ func logBlockSyncStatus(block interfaces.ReadOnlyBeaconBlock, blockRoot [32]byte
 			"parentRoot":                fmt.Sprintf("0x%s...", hex.EncodeToString(parentRoot[:])[:8]),
 			"version":                   version.String(block.Version()),
 			"sinceSlotStartTime":        prysmTime.Now().Sub(startTime),
-			"chainServiceProcessedTime": prysmTime.Now().Sub(receivedTime) - daWaitedTime,
+			"chainServiceProcessedTime": prysmTime.Now().Sub(receivedTime),
 			"deposits":                  len(block.Body().Deposits()),
-		}
-		log.WithFields(lf).Debug("Synced new block")
+		}).Debug("Synced new block")
 	} else {
 		log.WithFields(logrus.Fields{
 			"slot":           block.Slot(),
@@ -129,7 +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
@@ -358,7 +349,6 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 	for name, val := range refMap {
 		stateTrieReferences.WithLabelValues(name).Set(float64(val))
 	}
-	postState.RecordStateMetrics()

 	return nil
 }
--- a/beacon-chain/blockchain/metrics_test.go
+++ b/beacon-chain/blockchain/metrics_test.go
@@ -16,7 +16,7 @@ func TestReportEpochMetrics_BadHeadState(t *testing.T) {
 	require.NoError(t, err)
 	require.NoError(t, h.SetValidators(nil))
 	err = reportEpochMetrics(context.Background(), s, h)
-	require.ErrorContains(t, "failed to initialize precompute: state has nil validator slice", err)
+	require.ErrorContains(t, "failed to initialize precompute: nil validators in state", err)
 }

 func TestReportEpochMetrics_BadAttestation(t *testing.T) {
--- a/beacon-chain/blockchain/options.go
+++ b/beacon-chain/blockchain/options.go
@@ -3,9 +3,9 @@ package blockchain
 import (
 	"github.com/prysmaticlabs/prysm/v4/async/event"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/cache"
+	"github.com/prysmaticlabs/prysm/v4/beacon-chain/cache/depositcache"
 	statefeed "github.com/prysmaticlabs/prysm/v4/beacon-chain/core/feed/state"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db/filesystem"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/execution"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/operations/attestations"
@@ -62,25 +62,17 @@ func WithExecutionEngineCaller(c execution.EngineCaller) Option {
 }

 // WithDepositCache for deposit lifecycle after chain inclusion.
-func WithDepositCache(c cache.DepositCache) Option {
+func WithDepositCache(c *depositcache.DepositCache) Option {
 	return func(s *Service) error {
 		s.cfg.DepositCache = c
 		return nil
 	}
 }

-// WithPayloadIDCache for payload ID cache.
-func WithPayloadIDCache(c *cache.PayloadIDCache) Option {
+// WithProposerIdsCache for proposer id cache.
+func WithProposerIdsCache(c *cache.ProposerPayloadIDsCache) Option {
 	return func(s *Service) error {
-		s.cfg.PayloadIDCache = c
-		return nil
-	}
-}
-
-// WithTrackedValidatorsCache for tracked validators cache.
-func WithTrackedValidatorsCache(c *cache.TrackedValidatorsCache) Option {
-	return func(s *Service) error {
-		s.cfg.TrackedValidatorsCache = c
+		s.cfg.ProposerSlotIndexCache = c
 		return nil
 	}
 }
@@ -173,8 +165,6 @@ func WithFinalizedStateAtStartUp(st state.BeaconState) Option {
 	}
 }

-// WithClockSynchronizer sets the ClockSetter/ClockWaiter values to be used by services that need to block until
-// the genesis timestamp is known (ClockWaiter) or which determine the genesis timestamp (ClockSetter).
 func WithClockSynchronizer(gs *startup.ClockSynchronizer) Option {
 	return func(s *Service) error {
 		s.clockSetter = gs
@@ -182,19 +172,3 @@ func WithClockSynchronizer(gs *startup.ClockSynchronizer) Option {
 		return nil
 	}
 }
-
-// WithSyncComplete sets a channel that is used to notify blockchain service that the node has synced to head.
-func WithSyncComplete(c chan struct{}) Option {
-	return func(s *Service) error {
-		s.syncComplete = c
-		return nil
-	}
-}
-
-// WithBlobStorage sets the blob storage backend for the blockchain service.
-func WithBlobStorage(b *filesystem.BlobStorage) Option {
-	return func(s *Service) error {
-		s.blobStorage = b
-		return nil
-	}
-}
--- a/beacon-chain/blockchain/process_attestation_test.go
+++ b/beacon-chain/blockchain/process_attestation_test.go
@@ -2,7 +2,6 @@ package blockchain

 import (
 	"context"
-	"sync"
 	"testing"
 	"time"

@@ -146,61 +145,6 @@ func TestStore_OnAttestation_Ok_DoublyLinkedTree(t *testing.T) {
 	require.NoError(t, service.OnAttestation(ctx, att[0], 0))
 }

-func TestService_GetAttPreState_Concurrency(t *testing.T) {
-	service, _ := minimalTestService(t)
-	ctx := context.Background()
-
-	s, err := util.NewBeaconState()
-	require.NoError(t, err)
-	ckRoot := bytesutil.PadTo([]byte{'A'}, fieldparams.RootLength)
-	err = s.SetFinalizedCheckpoint(&ethpb.Checkpoint{Root: ckRoot})
-	require.NoError(t, err)
-	val := &ethpb.Validator{PublicKey: bytesutil.PadTo([]byte("foo"), 48), WithdrawalCredentials: bytesutil.PadTo([]byte("bar"), fieldparams.RootLength)}
-	err = s.SetValidators([]*ethpb.Validator{val})
-	require.NoError(t, err)
-	err = s.SetBalances([]uint64{0})
-	require.NoError(t, err)
-	r := [32]byte{'g'}
-	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, r))
-
-	cp1 := &ethpb.Checkpoint{Epoch: 1, Root: ckRoot}
-	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'A'})))
-	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: ckRoot}))
-
-	st, root, err := prepareForkchoiceState(ctx, 100, [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))
-
-	var wg sync.WaitGroup
-	errChan := make(chan error, 1000)
-
-	for i := 0; i < 1000; i++ {
-		wg.Add(1)
-		go func() {
-			defer wg.Done()
-			cp1 := &ethpb.Checkpoint{Epoch: 1, Root: ckRoot}
-			_, err := service.getAttPreState(ctx, cp1)
-			if err != nil {
-				errChan <- err
-			}
-		}()
-	}
-
-	go func() {
-		wg.Wait()
-		close(errChan)
-	}()
-
-	select {
-	case <-time.After(10 * time.Second):
-		t.Fatal("Test timed out")
-	case err, ok := <-errChan:
-		if ok && err != nil {
-			require.ErrorContains(t, "not a checkpoint in forkchoice", err)
-		}
-	}
-}
-
 func TestStore_SaveCheckpointState(t *testing.T) {
 	service, tr := minimalTestService(t)
 	ctx := tr.ctx
@@ -235,14 +179,14 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	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)}))

-	_, err = service.getAttPreState(ctx, cp2)
+	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)
+	s2, err = service.getAttPreState(ctx, cp2)
 	require.NoError(t, err)

 	assert.Equal(t, 2*params.BeaconConfig().SlotsPerEpoch, s2.Slot(), "Unexpected state slot")
--- a/beacon-chain/blockchain/process_block.go
+++ b/beacon-chain/blockchain/process_block.go
@@ -6,20 +6,15 @@ import (
 	"time"

 	"github.com/pkg/errors"
-	"go.opencensus.io/trace"
-
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/blocks"
 	"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/das"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db/filesystem"
 	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"
-	fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	consensusblocks "github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
@@ -27,10 +22,13 @@ 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"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
+	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 // A custom slot deadline for processing state slots in our cache.
@@ -42,71 +40,255 @@ const depositDeadline = 20 * time.Second
 // This defines size of the upper bound for initial sync block cache.
 var initialSyncBlockCacheSize = uint64(2 * params.BeaconConfig().SlotsPerEpoch)

-// postBlockProcessConfig is a structure that contains the data needed to
-// process the beacon block after validating the state transition function
-type postBlockProcessConfig struct {
-	ctx            context.Context
-	signed         interfaces.ReadOnlySignedBeaconBlock
-	blockRoot      [32]byte
-	headRoot       [32]byte
-	postState      state.BeaconState
-	isValidPayload bool
-}
-
-// 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(cfg *postBlockProcessConfig) error {
-	ctx, span := trace.StartSpan(cfg.ctx, "blockChain.onBlock")
+// 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()
-	cfg.ctx = ctx
-	if err := consensusblocks.BeaconBlockIsNil(cfg.signed); err != nil {
+	if err := consensusblocks.BeaconBlockIsNil(signed); err != nil {
 		return invalidBlock{error: err}
 	}
 	startTime := time.Now()
-	fcuArgs := &fcuConfig{}
+	b := signed.Block()

-	if s.inRegularSync() {
-		defer s.handleSecondFCUCall(cfg, fcuArgs)
-	}
-	defer s.sendLightClientFeeds(cfg)
-	defer s.sendStateFeedOnBlock(cfg)
-	defer reportProcessingTime(startTime)
-	defer reportAttestationInclusion(cfg.signed.Block())
-
-	err := s.cfg.ForkChoiceStore.InsertNode(ctx, cfg.postState, cfg.blockRoot)
+	preState, err := s.getBlockPreState(ctx, b)
 	if err != nil {
-		return errors.Wrapf(err, "could not insert block %d to fork choice store", cfg.signed.Block().Slot())
+		return err
 	}
-	if err := s.handleBlockAttestations(ctx, cfg.signed.Block(), cfg.postState); err != nil {
+
+	// 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 {
 		return errors.Wrap(err, "could not handle block's attestations")
 	}

-	s.InsertSlashingsToForkChoiceStore(ctx, cfg.signed.Block().Body().AttesterSlashings())
-	if cfg.isValidPayload {
-		if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, cfg.blockRoot); err != nil {
+	s.InsertSlashingsToForkChoiceStore(ctx, signed.Block().Body().AttesterSlashings())
+	if isValidPayload {
+		if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, blockRoot); err != nil {
 			return errors.Wrap(err, "could not set optimistic block to valid")
 		}
 	}
+
+	// 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()
-	cfg.headRoot, err = s.cfg.ForkChoiceStore.Head(ctx)
+	headRoot, err := s.cfg.ForkChoiceStore.Head(ctx)
 	if err != nil {
 		log.WithError(err).Warn("Could not update head")
 	}
+	if blockRoot != headRoot {
+		receivedWeight, err := s.cfg.ForkChoiceStore.Weight(blockRoot)
+		if err != nil {
+			log.WithField("root", fmt.Sprintf("%#x", blockRoot)).Warn("could not determine node weight")
+		}
+		headWeight, err := s.cfg.ForkChoiceStore.Weight(headRoot)
+		if err != nil {
+			log.WithField("root", fmt.Sprintf("%#x", headRoot)).Warn("could not determine node weight")
+		}
+		log.WithFields(logrus.Fields{
+			"receivedRoot":   fmt.Sprintf("%#x", blockRoot),
+			"receivedWeight": receivedWeight,
+			"headRoot":       fmt.Sprintf("%#x", headRoot),
+			"headWeight":     headWeight,
+		}).Debug("Head block is not the received block")
+	} else {
+		// Updating next slot state cache can happen in the background. It shouldn't block rest of the process.
+		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 := transition.UpdateNextSlotCache(slotCtx, blockRoot[:], postState); err != nil {
+				log.WithError(err).Debug("could not update next slot state cache")
+			}
+		}()
+	}
 	newBlockHeadElapsedTime.Observe(float64(time.Since(start).Milliseconds()))
-	if cfg.headRoot != cfg.blockRoot {
-		s.logNonCanonicalBlockReceived(cfg.blockRoot, cfg.headRoot)
-		return nil
-	}
-	if err := s.getFCUArgs(cfg, fcuArgs); err != nil {
-		log.WithError(err).Error("Could not get forkchoice update argument")
-		return nil
-	}
-	if err := s.sendFCU(cfg, fcuArgs); err != nil {
-		return errors.Wrap(err, "could not send FCU to engine")
+
+	// verify conditions for FCU, notifies FCU, and saves the new head.
+	// This function also prunes attestations, other similar operations happen in prunePostBlockOperationPools.
+	if _, err := s.forkchoiceUpdateWithExecution(ctx, headRoot, s.CurrentSlot()+1); err != nil {
+		return err
 	}

+	// Send notification of the processed block to the state feed.
+	s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
+		Type: statefeed.BlockProcessed,
+		Data: &statefeed.BlockProcessedData{
+			Slot:        signed.Block().Slot(),
+			BlockRoot:   blockRoot,
+			SignedBlock: signed,
+			Verified:    true,
+		},
+	})
+
+	// 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); err != nil {
+		return err
+	}
+	onBlockProcessingTime.Observe(float64(time.Since(startTime).Milliseconds()))
 	return nil
 }

@@ -128,14 +310,19 @@ func getStateVersionAndPayload(st state.BeaconState) (int, interfaces.ExecutionD
 	return preStateVersion, preStateHeader, nil
 }

-func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlock, avs das.AvailabilityStore) error {
+func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.ReadOnlySignedBeaconBlock,
+	blockRoots [][32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.onBlockBatch")
 	defer span.End()

-	if len(blks) == 0 {
+	if len(blks) == 0 || len(blockRoots) == 0 {
 		return errors.New("no blocks provided")
 	}

+	if len(blks) != len(blockRoots) {
+		return errWrongBlockCount
+	}
+
 	if err := consensusblocks.BeaconBlockIsNil(blks[0]); err != nil {
 		return invalidBlock{error: err}
 	}
@@ -185,7 +372,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 		}
 		// Save potential boundary states.
 		if slots.IsEpochStart(preState.Slot()) {
-			boundaries[b.Root()] = preState.Copy()
+			boundaries[blockRoots[i]] = preState.Copy()
 		}
 		jCheckpoints[i] = preState.CurrentJustifiedCheckpoint()
 		fCheckpoints[i] = preState.FinalizedCheckpoint()
@@ -218,12 +405,11 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 	pendingNodes := make([]*forkchoicetypes.BlockAndCheckpoints, len(blks))
 	var isValidPayload bool
 	for i, b := range blks {
-		root := b.Root()
 		isValidPayload, err = s.notifyNewPayload(ctx,
 			postVersionAndHeaders[i].version,
 			postVersionAndHeaders[i].header, b)
 		if err != nil {
-			return s.handleInvalidExecutionError(ctx, err, root, b.Block().ParentRoot())
+			return err
 		}
 		if isValidPayload {
 			if err := s.validateMergeTransitionBlock(ctx, preVersionAndHeaders[i].version,
@@ -231,20 +417,17 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 				return err
 			}
 		}
-		if err := avs.IsDataAvailable(ctx, s.CurrentSlot(), b); err != nil {
-			return errors.Wrapf(err, "could not validate blob data availability at slot %d", b.Block().Slot())
-		}
 		args := &forkchoicetypes.BlockAndCheckpoints{Block: b.Block(),
 			JustifiedCheckpoint: jCheckpoints[i],
 			FinalizedCheckpoint: fCheckpoints[i]}
 		pendingNodes[len(blks)-i-1] = args
-		if err := s.saveInitSyncBlock(ctx, root, b); err != nil {
+		if err := s.saveInitSyncBlock(ctx, blockRoots[i], b); err != nil {
 			tracing.AnnotateError(span, err)
 			return err
 		}
 		if err := s.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{
 			Slot: b.Block().Slot(),
-			Root: root[:],
+			Root: blockRoots[i][:],
 		}); err != nil {
 			tracing.AnnotateError(span, err)
 			return err
@@ -268,9 +451,8 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 			return err
 		}
 	}
-	lastB := blks[len(blks)-1]
-	lastBR := lastB.Root()
 	// Also saves the last post state which to be used as pre state for the next batch.
+	lastBR := blockRoots[len(blks)-1]
 	if err := s.cfg.StateGen.SaveState(ctx, lastBR, preState); err != nil {
 		return err
 	}
@@ -288,76 +470,79 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 			return errors.Wrap(err, "could not set optimistic block to valid")
 		}
 	}
-	arg := &fcuConfig{
+	lastB := blks[len(blks)-1]
+	arg := &notifyForkchoiceUpdateArg{
 		headState: preState,
 		headRoot:  lastBR,
-		headBlock: lastB,
+		headBlock: lastB.Block(),
 	}
 	if _, err := s.notifyForkchoiceUpdate(ctx, arg); err != nil {
 		return err
 	}
-	return s.saveHeadNoDB(ctx, lastB, lastBR, preState, !isValidPayload)
+	return s.saveHeadNoDB(ctx, lastB, lastBR, preState)
 }

-func (s *Service) updateEpochBoundaryCaches(ctx context.Context, st state.BeaconState) error {
-	e := coreTime.CurrentEpoch(st)
-	if err := helpers.UpdateCommitteeCache(ctx, st, e); err != nil {
-		return errors.Wrap(err, "could not update committee cache")
-	}
-	if err := helpers.UpdateProposerIndicesInCache(ctx, st, e); err != nil {
-		return errors.Wrap(err, "could not update proposer index cache")
-	}
-	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.UpdateCommitteeCache(slotCtx, st, e+1); err != nil {
-			log.WithError(err).Warn("Could not update committee cache")
+// Epoch boundary bookkeeping such as logging epoch summaries.
+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.ProcessSlots(ctx, copied, copied.Slot()+1)
+		if err != nil {
+			return err
+		}
+		// Update caches for the next epoch at epoch boundary slot - 1.
+		if err := helpers.UpdateCommitteeCache(ctx, copied, coreTime.CurrentEpoch(copied)); err != nil {
+			return err
+		}
+		if err := helpers.UpdateProposerIndicesInCache(ctx, copied); err != nil {
+			return err
+		}
+	} else if postState.Slot() >= s.nextEpochBoundarySlot {
+		s.nextEpochBoundarySlot, err = slots.EpochStart(coreTime.NextEpoch(postState))
+		if err != nil {
+			return err
+		}
+
+		// Update caches at epoch boundary slot.
+		// The following updates have shortcut to return nil cheaply if fulfilled during boundary slot - 1.
+		if err := helpers.UpdateCommitteeCache(ctx, postState, coreTime.CurrentEpoch(postState)); err != nil {
+			return err
+		}
+		if err := helpers.UpdateProposerIndicesInCache(ctx, postState); err != nil {
+			return err
+		}
+
+		headSt, err := s.HeadState(ctx)
+		if err != nil {
+			return err
+		}
+		if err := reportEpochMetrics(ctx, postState, headSt); err != nil {
+			return err
 		}
-	}()
-	// The latest block header is from the previous epoch
-	r, err := st.LatestBlockHeader().HashTreeRoot()
-	if err != nil {
-		log.WithError(err).Error("could not update proposer index state-root map")
-		return nil
-	}
-	// The proposer indices cache takes the target root for the previous
-	// epoch as key
-	if e > 0 {
-		e = e - 1
-	}
-	target, err := s.cfg.ForkChoiceStore.TargetRootForEpoch(r, e)
-	if err != nil {
-		log.WithError(err).Error("could not update proposer index state-root map")
-		return nil
-	}
-	err = helpers.UpdateCachedCheckpointToStateRoot(st, &forkchoicetypes.Checkpoint{Epoch: e, Root: target})
-	if err != nil {
-		log.WithError(err).Error("could not update proposer index state-root map")
 	}
+
 	return nil
 }

-// Epoch boundary tasks: it copies the headState and updates the epoch boundary
-// caches.
-func (s *Service) handleEpochBoundary(ctx context.Context, slot primitives.Slot, headState state.BeaconState, blockRoot []byte) error {
-	ctx, span := trace.StartSpan(ctx, "blockChain.handleEpochBoundary")
+// 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()
-	// return early if we are advancing to a past epoch
-	if slot < headState.Slot() {
-		return nil
+
+	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
+		}
 	}
-	if !slots.IsEpochEnd(slot) {
-		return nil
-	}
-	copied := headState.Copy()
-	copied, err := transition.ProcessSlotsUsingNextSlotCache(ctx, copied, blockRoot, slot+1)
-	if err != nil {
-		return err
-	}
-	return s.updateEpochBoundaryCaches(ctx, copied)
+
+	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
@@ -466,164 +651,46 @@ 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)

-// missingIndices uses the expected commitments from the block to determine
-// which BlobSidecar indices would need to be in the database for DA success.
-// It returns a map where each key represents a missing BlobSidecar index.
-// An empty map means we have all indices; a non-empty map can be used to compare incoming
-// BlobSidecars against the set of known missing sidecars.
-func missingIndices(bs *filesystem.BlobStorage, root [32]byte, expected [][]byte) (map[uint64]struct{}, error) {
-	if len(expected) == 0 {
-		return nil, nil
-	}
-	if len(expected) > fieldparams.MaxBlobsPerBlock {
-		return nil, errMaxBlobsExceeded
-	}
-	indices, err := bs.Indices(root)
-	if err != nil {
-		return nil, err
-	}
-	missing := make(map[uint64]struct{}, len(expected))
-	for i := range expected {
-		ui := uint64(i)
-		if len(expected[i]) > 0 {
-			if !indices[i] {
-				missing[ui] = struct{}{}
+			case <-s.ctx.Done():
+				log.Debug("Context closed, exiting routine")
+				return
 			}
 		}
-	}
-	return missing, nil
-}
-
-// isDataAvailable blocks until all BlobSidecars committed to in the block are available,
-// or an error or context cancellation occurs. A nil result means that the data availability check is successful.
-// The function will first check the database to see if all sidecars have been persisted. If any
-// sidecars are missing, it will then read from the blobNotifier channel for the given root until the channel is
-// closed, the context hits cancellation/timeout, or notifications have been received for all the missing sidecars.
-func (s *Service) isDataAvailable(ctx context.Context, root [32]byte, signed interfaces.ReadOnlySignedBeaconBlock) error {
-	if signed.Version() < version.Deneb {
-		return nil
-	}
-
-	block := signed.Block()
-	if block == nil {
-		return errors.New("invalid nil beacon block")
-	}
-	// We are only required to check within MIN_EPOCHS_FOR_BLOB_SIDECARS_REQUESTS
-	if !params.WithinDAPeriod(slots.ToEpoch(block.Slot()), slots.ToEpoch(s.CurrentSlot())) {
-		return nil
-	}
-
-	body := block.Body()
-	if body == nil {
-		return errors.New("invalid nil beacon block body")
-	}
-	kzgCommitments, err := body.BlobKzgCommitments()
-	if err != nil {
-		return errors.Wrap(err, "could not get KZG commitments")
-	}
-	// expected is the number of kzg commitments observed in the block.
-	expected := len(kzgCommitments)
-	if expected == 0 {
-		return nil
-	}
-	// get a map of BlobSidecar indices that are not currently available.
-	missing, err := missingIndices(s.blobStorage, root, kzgCommitments)
-	if err != nil {
-		return err
-	}
-	// If there are no missing indices, all BlobSidecars are available.
-	if len(missing) == 0 {
-		return nil
-	}
-
-	// The gossip handler for blobs writes the index of each verified blob referencing the given
-	// root to the channel returned by blobNotifiers.forRoot.
-	nc := s.blobNotifiers.forRoot(root)
-	for {
-		select {
-		case idx := <-nc:
-			// Delete each index seen in the notification channel.
-			delete(missing, idx)
-			// Read from the channel until there are no more missing sidecars.
-			if len(missing) > 0 {
-				continue
-			}
-			// Once all sidecars have been observed, clean up the notification channel.
-			s.blobNotifiers.delete(root)
-			return nil
-		case <-ctx.Done():
-			return errors.Wrap(ctx.Err(), "context deadline waiting for blob sidecars")
-		}
-	}
+	}()
 }

 // lateBlockTasks  is called 4 seconds into the slot and performs tasks
 // related to late blocks. It emits a MissedSlot state feed event.
 // It calls FCU and sets the right attributes if we are proposing next slot
-// it also updates the next slot cache and the proposer index cache to deal with skipped slots.
+// it also updates the next slot cache to deal with skipped slots.
 func (s *Service) lateBlockTasks(ctx context.Context) {
-	currentSlot := s.CurrentSlot()
 	if s.CurrentSlot() == s.HeadSlot() {
 		return
 	}
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
-	// return early if we are in init sync
-	if !s.inRegularSync() {
-		return
-	}
 	s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
 		Type: statefeed.MissedSlot,
 	})
-	s.headLock.RLock()
-	headRoot := s.headRoot()
-	headState := s.headState(ctx)
-	s.headLock.RUnlock()
-	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")
-	}
-	if err := s.handleEpochBoundary(ctx, currentSlot, headState, headRoot[:]); err != nil {
-		log.WithError(err).Error("lateBlockTasks: could not update epoch boundary caches")
-	}
-	// return early if we already started building a block for the current
-	// head root
-	_, has := s.cfg.PayloadIDCache.PayloadID(s.CurrentSlot()+1, headRoot)
-	if has {
+
+	// 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
 	}
-
-	attribute := s.getPayloadAttribute(ctx, headState, s.CurrentSlot()+1, headRoot[:])
-	// return early if we are not proposing next slot
-	if attribute.IsEmpty() {
-		return
-	}
-
 	s.headLock.RLock()
 	headBlock, err := s.headBlock()
 	if err != nil {
@@ -631,33 +698,22 @@ 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()
-
-	fcuArgs := &fcuConfig{
-		headState:  headState,
-		headRoot:   headRoot,
-		headBlock:  headBlock,
-		attributes: attribute,
-	}
-	_, err = s.notifyForkchoiceUpdate(ctx, fcuArgs)
+	_, err = s.notifyForkchoiceUpdate(ctx, &notifyForkchoiceUpdateArg{
+		headState: headState,
+		headRoot:  headRoot,
+		headBlock: headBlock.Block(),
+	})
 	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
@@ -3,28 +3,19 @@ package blockchain
 import (
 	"context"
 	"fmt"
-	"time"

-	"github.com/ethereum/go-ethereum/common"
 	"github.com/pkg/errors"
-	"github.com/sirupsen/logrus"
-	"go.opencensus.io/trace"
-
-	"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/transition"
 	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"
-	"github.com/prysmaticlabs/prysm/v4/config/features"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
 	mathutil "github.com/prysmaticlabs/prysm/v4/math"
-	ethpbv2 "github.com/prysmaticlabs/prysm/v4/proto/eth/v2"
 	ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v4/time/slots"
+	"go.opencensus.io/trace"
 )

 // CurrentSlot returns the current slot based on time.
@@ -32,252 +23,6 @@ func (s *Service) CurrentSlot() primitives.Slot {
 	return slots.CurrentSlot(uint64(s.genesisTime.Unix()))
 }

-// getFCUArgs returns the arguments to call forkchoice update
-func (s *Service) getFCUArgs(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) error {
-	if err := s.getFCUArgsEarlyBlock(cfg, fcuArgs); err != nil {
-		return err
-	}
-	if !s.inRegularSync() {
-		return nil
-	}
-	slot := cfg.signed.Block().Slot()
-	if slots.WithinVotingWindow(uint64(s.genesisTime.Unix()), slot) {
-		return nil
-	}
-	return s.computePayloadAttributes(cfg, fcuArgs)
-}
-
-func (s *Service) getFCUArgsEarlyBlock(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) error {
-	if cfg.blockRoot == cfg.headRoot {
-		fcuArgs.headState = cfg.postState
-		fcuArgs.headBlock = cfg.signed
-		fcuArgs.headRoot = cfg.headRoot
-		fcuArgs.proposingSlot = s.CurrentSlot() + 1
-		return nil
-	}
-	return s.fcuArgsNonCanonicalBlock(cfg, fcuArgs)
-}
-
-// logNonCanonicalBlockReceived prints a message informing that the received
-// block is not the head of the chain. It requires the caller holds a lock on
-// Foprkchoice.
-func (s *Service) logNonCanonicalBlockReceived(blockRoot [32]byte, headRoot [32]byte) {
-	receivedWeight, err := s.cfg.ForkChoiceStore.Weight(blockRoot)
-	if err != nil {
-		log.WithField("root", fmt.Sprintf("%#x", blockRoot)).Warn("could not determine node weight")
-	}
-	headWeight, err := s.cfg.ForkChoiceStore.Weight(headRoot)
-	if err != nil {
-		log.WithField("root", fmt.Sprintf("%#x", headRoot)).Warn("could not determine node weight")
-	}
-	log.WithFields(logrus.Fields{
-		"receivedRoot":   fmt.Sprintf("%#x", blockRoot),
-		"receivedWeight": receivedWeight,
-		"headRoot":       fmt.Sprintf("%#x", headRoot),
-		"headWeight":     headWeight,
-	}).Debug("Head block is not the received block")
-}
-
-// fcuArgsNonCanonicalBlock returns the arguments to the FCU call when the
-// incoming block is non-canonical, that is, based on the head root.
-func (s *Service) fcuArgsNonCanonicalBlock(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) error {
-	headState, headBlock, err := s.getStateAndBlock(cfg.ctx, cfg.headRoot)
-	if err != nil {
-		return err
-	}
-	fcuArgs.headState = headState
-	fcuArgs.headBlock = headBlock
-	fcuArgs.headRoot = cfg.headRoot
-	fcuArgs.proposingSlot = s.CurrentSlot() + 1
-	return nil
-}
-
-// sendStateFeedOnBlock sends an event that a new block has been synced
-func (s *Service) sendStateFeedOnBlock(cfg *postBlockProcessConfig) {
-	optimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(cfg.blockRoot)
-	if err != nil {
-		log.WithError(err).Debug("Could not check if block is optimistic")
-		optimistic = true
-	}
-	// Send notification of the processed block to the state feed.
-	s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
-		Type: statefeed.BlockProcessed,
-		Data: &statefeed.BlockProcessedData{
-			Slot:        cfg.signed.Block().Slot(),
-			BlockRoot:   cfg.blockRoot,
-			SignedBlock: cfg.signed,
-			Verified:    true,
-			Optimistic:  optimistic,
-		},
-	})
-}
-
-// sendLightClientFeeds sends the light client feeds when feature flag is enabled.
-func (s *Service) sendLightClientFeeds(cfg *postBlockProcessConfig) {
-	if features.Get().EnableLightClient {
-		if _, err := s.sendLightClientOptimisticUpdate(cfg.ctx, cfg.signed, cfg.postState); err != nil {
-			log.WithError(err).Error("Failed to send light client optimistic update")
-		}
-
-		// Get the finalized checkpoint
-		finalized := s.ForkChoicer().FinalizedCheckpoint()
-
-		// LightClientFinalityUpdate needs super majority
-		s.tryPublishLightClientFinalityUpdate(cfg.ctx, cfg.signed, finalized, cfg.postState)
-	}
-}
-
-func (s *Service) tryPublishLightClientFinalityUpdate(ctx context.Context, signed interfaces.ReadOnlySignedBeaconBlock, finalized *forkchoicetypes.Checkpoint, postState state.BeaconState) {
-	if finalized.Epoch <= s.lastPublishedLightClientEpoch {
-		return
-	}
-
-	config := params.BeaconConfig()
-	if finalized.Epoch < config.AltairForkEpoch {
-		return
-	}
-
-	syncAggregate, err := signed.Block().Body().SyncAggregate()
-	if err != nil || syncAggregate == nil {
-		return
-	}
-
-	// LightClientFinalityUpdate needs super majority
-	if syncAggregate.SyncCommitteeBits.Count()*3 < config.SyncCommitteeSize*2 {
-		return
-	}
-
-	_, err = s.sendLightClientFinalityUpdate(ctx, signed, postState)
-	if err != nil {
-		log.WithError(err).Error("Failed to send light client finality update")
-	} else {
-		s.lastPublishedLightClientEpoch = finalized.Epoch
-	}
-}
-
-// sendLightClientFinalityUpdate sends a light client finality update notification to the state feed.
-func (s *Service) sendLightClientFinalityUpdate(ctx context.Context, signed interfaces.ReadOnlySignedBeaconBlock,
-	postState state.BeaconState) (int, error) {
-	// Get attested state
-	attestedRoot := signed.Block().ParentRoot()
-	attestedState, err := s.cfg.StateGen.StateByRoot(ctx, attestedRoot)
-	if err != nil {
-		return 0, errors.Wrap(err, "could not get attested state")
-	}
-
-	// Get finalized block
-	var finalizedBlock interfaces.ReadOnlySignedBeaconBlock
-	finalizedCheckPoint := attestedState.FinalizedCheckpoint()
-	if finalizedCheckPoint != nil {
-		finalizedRoot := bytesutil.ToBytes32(finalizedCheckPoint.Root)
-		finalizedBlock, err = s.cfg.BeaconDB.Block(ctx, finalizedRoot)
-		if err != nil {
-			finalizedBlock = nil
-		}
-	}
-
-	update, err := NewLightClientFinalityUpdateFromBeaconState(
-		ctx,
-		postState,
-		signed,
-		attestedState,
-		finalizedBlock,
-	)
-
-	if err != nil {
-		return 0, errors.Wrap(err, "could not create light client update")
-	}
-
-	// Return the result
-	result := &ethpbv2.LightClientFinalityUpdateWithVersion{
-		Version: ethpbv2.Version(signed.Version()),
-		Data:    CreateLightClientFinalityUpdate(update),
-	}
-
-	// Send event
-	return s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
-		Type: statefeed.LightClientFinalityUpdate,
-		Data: result,
-	}), nil
-}
-
-// sendLightClientOptimisticUpdate sends a light client optimistic update notification to the state feed.
-func (s *Service) sendLightClientOptimisticUpdate(ctx context.Context, signed interfaces.ReadOnlySignedBeaconBlock,
-	postState state.BeaconState) (int, error) {
-	// Get attested state
-	attestedRoot := signed.Block().ParentRoot()
-	attestedState, err := s.cfg.StateGen.StateByRoot(ctx, attestedRoot)
-	if err != nil {
-		return 0, errors.Wrap(err, "could not get attested state")
-	}
-
-	update, err := NewLightClientOptimisticUpdateFromBeaconState(
-		ctx,
-		postState,
-		signed,
-		attestedState,
-	)
-
-	if err != nil {
-		return 0, errors.Wrap(err, "could not create light client update")
-	}
-
-	// Return the result
-	result := &ethpbv2.LightClientOptimisticUpdateWithVersion{
-		Version: ethpbv2.Version(signed.Version()),
-		Data:    CreateLightClientOptimisticUpdate(update),
-	}
-
-	return s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
-		Type: statefeed.LightClientOptimisticUpdate,
-		Data: result,
-	}), nil
-}
-
-// updateCachesPostBlockProcessing updates the next slot cache and handles the epoch
-// boundary in order to compute the right proposer indices after processing
-// state transition. This function is called on late blocks while still locked,
-// before sending FCU to the engine.
-func (s *Service) updateCachesPostBlockProcessing(cfg *postBlockProcessConfig) error {
-	slot := cfg.postState.Slot()
-	if err := transition.UpdateNextSlotCache(cfg.ctx, cfg.blockRoot[:], cfg.postState); err != nil {
-		return errors.Wrap(err, "could not update next slot state cache")
-	}
-	if !slots.IsEpochEnd(slot) {
-		return nil
-	}
-	return s.handleEpochBoundary(cfg.ctx, slot, cfg.postState, cfg.blockRoot[:])
-}
-
-// handleSecondFCUCall handles a second call to FCU when syncing a new block.
-// This is useful when proposing in the next block and we want to defer the
-// computation of the next slot shuffling.
-func (s *Service) handleSecondFCUCall(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) {
-	if (fcuArgs.attributes == nil || fcuArgs.attributes.IsEmpty()) && cfg.headRoot == cfg.blockRoot {
-		go s.sendFCUWithAttributes(cfg, fcuArgs)
-	}
-}
-
-// reportProcessingTime reports the metric of how long it took to process the
-// current block
-func reportProcessingTime(startTime time.Time) {
-	onBlockProcessingTime.Observe(float64(time.Since(startTime).Milliseconds()))
-}
-
-// computePayloadAttributes modifies the passed FCU arguments to
-// contain the right payload attributes with the tracked proposer. It gets
-// called on blocks that arrive after the attestation voting window, or in a
-// background routine after syncing early blocks.
-func (s *Service) computePayloadAttributes(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) error {
-	if cfg.blockRoot == cfg.headRoot {
-		if err := s.updateCachesPostBlockProcessing(cfg); err != nil {
-			return err
-		}
-	}
-	fcuArgs.attributes = s.getPayloadAttribute(cfg.ctx, fcuArgs.headState, fcuArgs.proposingSlot, cfg.headRoot[:])
-	return nil
-}
-
 // getBlockPreState returns the pre state of an incoming block. It uses the parent root of the block
 // to retrieve the state in DB. It verifies the pre state's validity and the incoming block
 // is in the correct time window.
@@ -299,7 +44,7 @@ func (s *Service) getBlockPreState(ctx context.Context, b interfaces.ReadOnlyBea
 	}

 	// Verify block slot time is not from the future.
-	if err := slots.VerifyTime(uint64(s.genesisTime.Unix()), b.Slot(), params.BeaconConfig().MaximumGossipClockDisparityDuration()); err != nil {
+	if err := slots.VerifyTime(uint64(s.genesisTime.Unix()), b.Slot(), params.BeaconNetworkConfig().MaximumGossipClockDisparity); err != nil {
 		return nil, err
 	}

@@ -464,45 +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), common.Hash(finalizedState.Eth1Data().BlockHash),
-		0 /* Setting a zero value as we have no access to block height */); 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()).Debugf("Finalized deposit insertion completed at index %d", finalizedEth1DepIdx)
+	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
@@ -16,9 +16,7 @@ import (
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/blocks"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/signing"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/transition"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/das"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db"
-	"github.com/prysmaticlabs/prysm/v4/beacon-chain/db/filesystem"
 	testDB "github.com/prysmaticlabs/prysm/v4/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/execution"
 	mockExecution "github.com/prysmaticlabs/prysm/v4/beacon-chain/execution/testing"
@@ -43,6 +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
@@ -51,7 +146,8 @@ func TestStore_OnBlockBatch(t *testing.T) {
 	require.NoError(t, service.saveGenesisData(ctx, st))
 	bState := st.Copy()

-	var blks []consensusblocks.ROBlock
+	var blks []interfaces.ReadOnlySignedBeaconBlock
+	var blkRoots [][32]byte
 	for i := 0; i < 97; i++ {
 		b, err := util.GenerateFullBlock(bState, keys, util.DefaultBlockGenConfig(), primitives.Slot(i))
 		require.NoError(t, err)
@@ -64,15 +160,16 @@ func TestStore_OnBlockBatch(t *testing.T) {
 		require.NoError(t, service.saveInitSyncBlock(ctx, root, wsb))
 		wsb, err = consensusblocks.NewSignedBeaconBlock(b)
 		require.NoError(t, err)
-		rwsb, err := consensusblocks.NewROBlock(wsb)
-		require.NoError(t, err)
-		blks = append(blks, rwsb)
+		blks = append(blks, wsb)
+		blkRoots = append(blkRoots, root)
 	}
-	err := service.onBlockBatch(ctx, blks, &das.MockAvailabilityStore{})
+	err := service.onBlockBatch(ctx, blks, blkRoots[1:])
+	require.ErrorIs(t, errWrongBlockCount, err)
+	err = service.onBlockBatch(ctx, blks, blkRoots)
 	require.NoError(t, err)
 	jcp := service.CurrentJustifiedCheckpt()
 	jroot := bytesutil.ToBytes32(jcp.Root)
-	require.Equal(t, blks[63].Root(), jroot)
+	require.Equal(t, blkRoots[63], jroot)
 	require.Equal(t, primitives.Epoch(2), service.cfg.ForkChoiceStore.JustifiedCheckpoint().Epoch)
 }

@@ -84,7 +181,8 @@ func TestStore_OnBlockBatch_NotifyNewPayload(t *testing.T) {
 	require.NoError(t, service.saveGenesisData(ctx, st))
 	bState := st.Copy()

-	var blks []consensusblocks.ROBlock
+	var blks []interfaces.ReadOnlySignedBeaconBlock
+	var blkRoots [][32]byte
 	blkCount := 4
 	for i := 0; i <= blkCount; i++ {
 		b, err := util.GenerateFullBlock(bState, keys, util.DefaultBlockGenConfig(), primitives.Slot(i))
@@ -93,12 +191,13 @@ func TestStore_OnBlockBatch_NotifyNewPayload(t *testing.T) {
 		require.NoError(t, err)
 		bState, err = transition.ExecuteStateTransition(ctx, bState, wsb)
 		require.NoError(t, err)
-		rwsb, err := consensusblocks.NewROBlock(wsb)
+		root, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		require.NoError(t, service.saveInitSyncBlock(ctx, rwsb.Root(), wsb))
-		blks = append(blks, rwsb)
+		require.NoError(t, service.saveInitSyncBlock(ctx, root, wsb))
+		blks = append(blks, wsb)
+		blkRoots = append(blkRoots, root)
 	}
-	require.NoError(t, service.onBlockBatch(ctx, blks, &das.MockAvailabilityStore{}))
+	require.NoError(t, service.onBlockBatch(ctx, blks, blkRoots))
 }

 func TestCachedPreState_CanGetFromStateSummary(t *testing.T) {
@@ -537,7 +636,8 @@ 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.Slot(), s, []byte{}))
+	require.NoError(t, service.handleEpochBoundary(ctx, s))
+	require.Equal(t, 3*params.BeaconConfig().SlotsPerEpoch, service.nextEpochBoundarySlot)
 }

 func TestOnBlock_CanFinalize_WithOnTick(t *testing.T) {
@@ -557,20 +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(&postBlockProcessConfig{ctx, wsb, r, [32]byte{}, 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)
 	}
@@ -605,20 +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(&postBlockProcessConfig{ctx, wsb, r, [32]byte{}, 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)
 	}
@@ -640,7 +714,8 @@ func TestOnBlock_CanFinalize(t *testing.T) {

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

@@ -654,11 +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))
 }

@@ -682,13 +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(&postBlockProcessConfig{ctx, wsb, r, [32]byte{}, postState, false}))
+		require.NoError(t, service.onBlock(ctx, wsb, r))
 		testState, err = service.cfg.StateGen.StateByRoot(ctx, r)
 		require.NoError(t, err)
 	}
@@ -701,7 +770,7 @@ func TestInsertFinalizedDeposits(t *testing.T) {
 	gs, _ := util.DeterministicGenesisState(t, 32)
 	require.NoError(t, service.saveGenesisData(ctx, gs))
 	gs = gs.Copy()
-	assert.NoError(t, gs.SetEth1Data(&ethpb.Eth1Data{DepositCount: 10, BlockHash: make([]byte, 32)}))
+	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
@@ -714,56 +783,15 @@ 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'})
-	fDeposits, err := depositCache.FinalizedDeposits(ctx)
-	require.NoError(t, err)
-	assert.Equal(t, 7, int(fDeposits.MerkleTrieIndex()), "Finalized deposits not inserted correctly")
+	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))
 	for _, d := range deps {
 		assert.DeepEqual(t, [][]byte(nil), d.Proof, "Proofs are not empty")
 	}
 }

-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, BlockHash: make([]byte, 32)}))
-	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, err := depositCache.FinalizedDeposits(ctx)
-	require.NoError(t, err)
-	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
@@ -771,11 +799,11 @@ func TestInsertFinalizedDeposits_MultipleFinalizedRoutines(t *testing.T) {
 	gs, _ := util.DeterministicGenesisState(t, 32)
 	require.NoError(t, service.saveGenesisData(ctx, gs))
 	gs = gs.Copy()
-	assert.NoError(t, gs.SetEth1Data(&ethpb.Eth1Data{DepositCount: 7, BlockHash: make([]byte, 32)}))
+	assert.NoError(t, gs.SetEth1Data(&ethpb.Eth1Data{DepositCount: 7}))
 	assert.NoError(t, gs.SetEth1DepositIndex(6))
 	assert.NoError(t, service.cfg.StateGen.SaveState(ctx, [32]byte{'m', 'o', 'c', 'k'}, gs))
 	gs2 := gs.Copy()
-	assert.NoError(t, gs2.SetEth1Data(&ethpb.Eth1Data{DepositCount: 15, BlockHash: make([]byte, 32)}))
+	assert.NoError(t, gs2.SetEth1Data(&ethpb.Eth1Data{DepositCount: 15}))
 	assert.NoError(t, gs2.SetEth1DepositIndex(13))
 	assert.NoError(t, service.cfg.StateGen.SaveState(ctx, [32]byte{'m', 'o', 'c', 'k', '2'}, gs2))
 	var zeroSig [96]byte
@@ -789,11 +817,11 @@ func TestInsertFinalizedDeposits_MultipleFinalizedRoutines(t *testing.T) {
 		}, Proof: [][]byte{root}}, 100+i, int64(i), bytesutil.ToBytes32(root)))
 	}
 	// Insert 3 deposits before hand.
-	require.NoError(t, depositCache.InsertFinalizedDeposits(ctx, 2, [32]byte{}, 0))
-	service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k'})
-	fDeposits, err := depositCache.FinalizedDeposits(ctx)
-	require.NoError(t, err)
-	assert.Equal(t, 5, int(fDeposits.MerkleTrieIndex()), "Finalized deposits not inserted correctly")
+	require.NoError(t, depositCache.InsertFinalizedDeposits(ctx, 2))
+
+	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")

 	deps := depositCache.AllDeposits(ctx, big.NewInt(105))
 	for _, d := range deps {
@@ -801,10 +829,9 @@ func TestInsertFinalizedDeposits_MultipleFinalizedRoutines(t *testing.T) {
 	}

 	// Insert New Finalized State with higher deposit count.
-	service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k', '2'})
-	fDeposits, err = depositCache.FinalizedDeposits(ctx)
-	require.NoError(t, err)
-	assert.Equal(t, 12, int(fDeposits.MerkleTrieIndex()), "Finalized deposits not inserted correctly")
+	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))
 	for _, d := range deps {
 		assert.DeepEqual(t, [][]byte(nil), d.Proof, "Proofs are not empty")
@@ -894,7 +921,7 @@ func Test_validateMergeTransitionBlock(t *testing.T) {
 	cfg.TerminalBlockHash = params.BeaconConfig().ZeroHash
 	params.OverrideBeaconConfig(cfg)

-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
+	service, tr := minimalTestService(t, WithProposerIdsCache(cache.NewProposerPayloadIDsCache()))
 	ctx := tr.ctx

 	aHash := common.BytesToHash([]byte("a"))
@@ -911,6 +938,7 @@ func Test_validateMergeTransitionBlock(t *testing.T) {
 			name:         "state older than Bellatrix, nil payload",
 			stateVersion: 1,
 			payload:      nil,
+			errString:    "attempted to wrap nil",
 		},
 		{
 			name:         "state older than Bellatrix, empty payload",
@@ -922,10 +950,8 @@ func Test_validateMergeTransitionBlock(t *testing.T) {
 				ReceiptsRoot:  make([]byte, fieldparams.RootLength),
 				LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
 				PrevRandao:    make([]byte, fieldparams.RootLength),
-				ExtraData:     make([]byte, 0),
 				BaseFeePerGas: make([]byte, fieldparams.RootLength),
 				BlockHash:     make([]byte, fieldparams.RootLength),
-				Transactions:  make([][]byte, 0),
 			},
 		},
 		{
@@ -939,6 +965,7 @@ func Test_validateMergeTransitionBlock(t *testing.T) {
 			name:         "state is Bellatrix, nil payload",
 			stateVersion: 2,
 			payload:      nil,
+			errString:    "attempted to wrap nil",
 		},
 		{
 			name:         "state is Bellatrix, empty payload",
@@ -968,7 +995,6 @@ func Test_validateMergeTransitionBlock(t *testing.T) {
 					ReceiptsRoot:     make([]byte, fieldparams.RootLength),
 					LogsBloom:        make([]byte, fieldparams.LogsBloomLength),
 					PrevRandao:       make([]byte, fieldparams.RootLength),
-					ExtraData:        make([]byte, 0),
 					BaseFeePerGas:    make([]byte, fieldparams.RootLength),
 					BlockHash:        make([]byte, fieldparams.RootLength),
 					TransactionsRoot: make([]byte, fieldparams.RootLength),
@@ -1104,45 +1130,20 @@ func TestOnBlock_ProcessBlocksParallel(t *testing.T) {
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 		var wg sync.WaitGroup
 		wg.Add(4)
-		var lock sync.Mutex
 		go func() {
-			preState, err := service.getBlockPreState(ctx, wsb1.Block())
-			require.NoError(t, err)
-			postState, err := service.validateStateTransition(ctx, preState, wsb1)
-			require.NoError(t, err)
-			lock.Lock()
-			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb1, r1, [32]byte{}, postState, true}))
-			lock.Unlock()
+			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)
-			lock.Lock()
-			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb2, r2, [32]byte{}, postState, true}))
-			lock.Unlock()
+			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)
-			lock.Lock()
-			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb3, r3, [32]byte{}, postState, true}))
-			lock.Unlock()
+			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)
-			lock.Lock()
-			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb4, r4, [32]byte{}, postState, true}))
-			lock.Unlock()
+			require.NoError(t, service.onBlock(ctx, wsb4, r4))
 			wg.Done()
 		}()
 		wg.Wait()
@@ -1210,13 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}

 	for i := 6; i < 12; i++ {
@@ -1229,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}

@@ -1248,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}
 	// Check that we haven't justified the second epoch yet
@@ -1270,12 +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(&postBlockProcessConfig{ctx, wsb, firstInvalidRoot, [32]byte{}, 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)
@@ -1298,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, 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
@@ -1326,13 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, 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
@@ -1389,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}

 	for i := 6; i < 12; i++ {
@@ -1407,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}

@@ -1426,13 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}
 	// Check that we haven't justified the second epoch yet
@@ -1449,12 +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(&postBlockProcessConfig{ctx, wsb, firstInvalidRoot, [32]byte{}, 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)
@@ -1477,12 +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
@@ -1505,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, 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
@@ -1568,13 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}

 	for i := 6; i < 12; i++ {
@@ -1587,13 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}

@@ -1607,12 +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(&postBlockProcessConfig{ctx, wsb, lastValidRoot, [32]byte{}, 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
@@ -1634,12 +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(&postBlockProcessConfig{ctx, wsb, invalidRoots[i-13], [32]byte{}, postState, false})
+		err = service.onBlock(ctx, wsb, invalidRoots[i-13])
 		require.NoError(t, err)
 	}
 	// Check that we have justified the second epoch
@@ -1660,12 +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
@@ -1699,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, 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)
@@ -1722,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, true})
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 		st, err = service.cfg.StateGen.StateByRoot(ctx, root)
 		require.NoError(t, err)
@@ -1747,13 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, true})
+	err = service.onBlock(ctx, wsb, root)
 	require.NoError(t, err)
 	require.Equal(t, root, service.cfg.ForkChoiceStore.CachedHeadRoot())
 	sjc = service.CurrentJustifiedCheckpt()
@@ -1804,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
+		require.NoError(t, service.onBlock(ctx, wsb, root))
 	}

 	for i := 6; i < 12; i++ {
@@ -1822,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
+		err = service.onBlock(ctx, wsb, root)
 		require.NoError(t, err)
 	}

@@ -1841,12 +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(&postBlockProcessConfig{ctx, wsb, lastValidRoot, [32]byte{}, 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
@@ -1867,18 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, 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()
@@ -1897,11 +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
@@ -1943,10 +1808,8 @@ func TestNoViableHead_Reboot(t *testing.T) {
 	require.NoError(t, err)
 	root, err = b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	rwsb, err := consensusblocks.NewROBlock(wsb)
-	require.NoError(t, err)
 	// We use onBlockBatch here because the valid chain is missing in forkchoice
-	require.NoError(t, service.onBlockBatch(ctx, []consensusblocks.ROBlock{rwsb}, &das.MockAvailabilityStore{}))
+	require.NoError(t, service.onBlockBatch(ctx, []interfaces.ReadOnlySignedBeaconBlock{wsb}, [][32]byte{root}))
 	// Check that the head is now VALID and the node is not optimistic
 	require.Equal(t, genesisRoot, service.ensureRootNotZeros(service.cfg.ForkChoiceStore.CachedHeadRoot()))
 	headRoot, err = service.HeadRoot(ctx)
@@ -1985,12 +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(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
+	require.NoError(t, service.onBlock(ctx, wsb, root))

 	st, err = service.HeadState(ctx)
 	require.NoError(t, err)
@@ -2045,131 +1903,6 @@ func TestFillMissingBlockPayloadId_PrepareAllPayloads(t *testing.T) {
 // Helper function to simulate the block being on time or delayed for proposer
 // boost. It alters the genesisTime tracked by the store.
 func driftGenesisTime(s *Service, slot, delay int64) {
-	offset := slot*int64(params.BeaconConfig().SecondsPerSlot) + delay
+	offset := slot*int64(params.BeaconConfig().SecondsPerSlot) - delay
 	s.SetGenesisTime(time.Unix(time.Now().Unix()-offset, 0))
 }
-
-func TestMissingIndices(t *testing.T) {
-	cases := []struct {
-		name     string
-		expected [][]byte
-		present  []uint64
-		result   map[uint64]struct{}
-		root     [32]byte
-		err      error
-	}{
-		{
-			name: "zero len",
-		},
-		{
-			name:     "expected exceeds max",
-			expected: fakeCommitments(fieldparams.MaxBlobsPerBlock + 1),
-			err:      errMaxBlobsExceeded,
-		},
-		{
-			name:     "first missing",
-			expected: fakeCommitments(fieldparams.MaxBlobsPerBlock),
-			present:  []uint64{1, 2, 3, 4, 5},
-			result:   fakeResult([]uint64{0}),
-		},
-		{
-			name:     "all missing",
-			expected: fakeCommitments(fieldparams.MaxBlobsPerBlock),
-			result:   fakeResult([]uint64{0, 1, 2, 3, 4, 5}),
-		},
-		{
-			name:     "none missing",
-			expected: fakeCommitments(fieldparams.MaxBlobsPerBlock),
-			present:  []uint64{0, 1, 2, 3, 4, 5},
-			result:   fakeResult([]uint64{}),
-		},
-		{
-			name:     "one commitment, missing",
-			expected: fakeCommitments(1),
-			present:  []uint64{},
-			result:   fakeResult([]uint64{0}),
-		},
-		{
-			name:     "3 commitments, 1 missing",
-			expected: fakeCommitments(3),
-			present:  []uint64{1},
-			result:   fakeResult([]uint64{0, 2}),
-		},
-		{
-			name:     "3 commitments, none missing",
-			expected: fakeCommitments(3),
-			present:  []uint64{0, 1, 2},
-			result:   fakeResult([]uint64{}),
-		},
-		{
-			name:     "3 commitments, all missing",
-			expected: fakeCommitments(3),
-			present:  []uint64{},
-			result:   fakeResult([]uint64{0, 1, 2}),
-		},
-	}
-
-	for _, c := range cases {
-		bm, bs := filesystem.NewEphemeralBlobStorageWithMocker(t)
-		t.Run(c.name, func(t *testing.T) {
-			require.NoError(t, bm.CreateFakeIndices(c.root, c.present))
-			missing, err := missingIndices(bs, c.root, c.expected)
-			if c.err != nil {
-				require.ErrorIs(t, err, c.err)
-				return
-			}
-			require.NoError(t, err)
-			require.Equal(t, len(c.result), len(missing))
-			for key := range c.result {
-				m, ok := missing[key]
-				require.Equal(t, true, ok)
-				require.Equal(t, c.result[key], m)
-			}
-		})
-	}
-}
-
-func Test_getFCUArgs(t *testing.T) {
-	s, tr := minimalTestService(t)
-	ctx := tr.ctx
-	st, keys := util.DeterministicGenesisState(t, 64)
-	b, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), 1)
-	require.NoError(t, err)
-	wsb, err := consensusblocks.NewSignedBeaconBlock(b)
-	require.NoError(t, err)
-
-	cfg := &postBlockProcessConfig{
-		ctx:            ctx,
-		signed:         wsb,
-		blockRoot:      [32]byte{'a'},
-		postState:      st,
-		isValidPayload: true,
-	}
-	// error branch
-	fcuArgs := &fcuConfig{}
-	err = s.getFCUArgs(cfg, fcuArgs)
-	require.ErrorContains(t, "block does not exist", err)
-
-	// canonical branch
-	cfg.headRoot = cfg.blockRoot
-	fcuArgs = &fcuConfig{}
-	err = s.getFCUArgs(cfg, fcuArgs)
-	require.NoError(t, err)
-	require.Equal(t, cfg.blockRoot, fcuArgs.headRoot)
-}
-
-func fakeCommitments(n int) [][]byte {
-	f := make([][]byte, n)
-	for i := range f {
-		f[i] = make([]byte, 48)
-	}
-	return f
-}
-
-func fakeResult(missing []uint64) map[uint64]struct{} {
-	r := make(map[uint64]struct{}, len(missing))
-	for i := range missing {
-		r[missing[i]] = struct{}{}
-	}
-	return r
-}
--- a/beacon-chain/blockchain/receive_attestation.go
+++ b/beacon-chain/blockchain/receive_attestation.go
@@ -9,6 +9,7 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/v4/config/features"
 	"github.com/prysmaticlabs/prysm/v4/config/params"
 	"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
@@ -52,12 +53,16 @@ func (s *Service) AttestationTargetState(ctx context.Context, target *ethpb.Chec

 // VerifyLmdFfgConsistency verifies that attestation's LMD and FFG votes are consistency to each other.
 func (s *Service) VerifyLmdFfgConsistency(ctx context.Context, a *ethpb.Attestation) error {
-	r, err := s.TargetRootForEpoch([32]byte(a.Data.BeaconBlockRoot), a.Data.Target.Epoch)
+	targetSlot, err := slots.EpochStart(a.Data.Target.Epoch)
 	if err != nil {
 		return err
 	}
-	if !bytes.Equal(a.Data.Target.Root, r[:]) {
-		return fmt.Errorf("FFG and LMD votes are not consistent, block root: %#x, target root: %#x, canonical target root: %#x", a.Data.BeaconBlockRoot, a.Data.Target.Root, r)
+	r, err := s.Ancestor(ctx, a.Data.BeaconBlockRoot, targetSlot)
+	if err != nil {
+		return err
+	}
+	if !bytes.Equal(a.Data.Target.Root, r) {
+		return errors.New("FFG and LMD votes are not consistent")
 	}
 	return nil
 }
@@ -81,30 +86,23 @@ func (s *Service) spawnProcessAttestationsRoutine() {
 			}
 			log.Warn("Genesis time received, now available to process attestations")
 		}
-		// Wait for node to be synced before running the routine.
-		if err := s.waitForSync(); err != nil {
-			log.WithError(err).Error("Could not wait to sync")
-			return
-		}

-		reorgInterval := time.Second*time.Duration(params.BeaconConfig().SecondsPerSlot) - reorgLateBlockCountAttestations
-		ticker := slots.NewSlotTickerWithIntervals(s.genesisTime, []time.Duration{0, reorgInterval})
+		st := slots.NewSlotTicker(s.genesisTime, params.BeaconConfig().SecondsPerSlot)
+		pat := slots.NewSlotTickerWithOffset(s.genesisTime, -reorgLateBlockCountAttestations, params.BeaconConfig().SecondsPerSlot)
 		for {
 			select {
 			case <-s.ctx.Done():
 				return
-			case slotInterval := <-ticker.C():
-				if slotInterval.Interval > 0 {
-					s.UpdateHead(s.ctx, slotInterval.Slot+1)
-				} else {
-					s.cfg.ForkChoiceStore.Lock()
-					if err := s.cfg.ForkChoiceStore.NewSlot(s.ctx, slotInterval.Slot); err != nil {
-						log.WithError(err).Error("could not process new slot")
-					}
-					s.cfg.ForkChoiceStore.Unlock()
-
-					s.UpdateHead(s.ctx, slotInterval.Slot)
+			case <-pat.C():
+				s.UpdateHead(s.ctx, s.CurrentSlot()+1)
+			case <-st.C():
+				s.cfg.ForkChoiceStore.Lock()
+				if err := s.cfg.ForkChoiceStore.NewSlot(s.ctx, s.CurrentSlot()); err != nil {
+					log.WithError(err).Error("could not process new slot")
 				}
+				s.cfg.ForkChoiceStore.Unlock()
+
+				s.UpdateHead(s.ctx, s.CurrentSlot())
 			}
 		}
 	}()
@@ -120,45 +118,37 @@ func (s *Service) UpdateHead(ctx context.Context, proposingSlot primitives.Slot)
 	s.cfg.ForkChoiceStore.Lock()
 	defer s.cfg.ForkChoiceStore.Unlock()
 	// This function is only called at 10 seconds or 0 seconds into the slot
-	disparity := params.BeaconConfig().MaximumGossipClockDisparityDuration()
-	disparity += reorgLateBlockCountAttestations
-
+	disparity := params.BeaconNetworkConfig().MaximumGossipClockDisparity
+	if !features.Get().DisableReorgLateBlocks {
+		disparity += reorgLateBlockCountAttestations
+	}
 	s.processAttestations(ctx, disparity)

 	processAttsElapsedTime.Observe(float64(time.Since(start).Milliseconds()))

 	start = time.Now()
-	// return early if we haven't changed head
 	newHeadRoot, err := s.cfg.ForkChoiceStore.Head(ctx)
 	if err != nil {
 		log.WithError(err).Error("Could not compute head from new attestations")
-		return
-	}
-	if !s.isNewHead(newHeadRoot) {
-		return
-	}
-	log.WithField("newHeadRoot", fmt.Sprintf("%#x", newHeadRoot)).Debug("Head changed due to attestations")
-	headState, headBlock, err := s.getStateAndBlock(ctx, newHeadRoot)
-	if err != nil {
-		log.WithError(err).Error("could not get head block")
-		return
+		// Fallback to our current head root in the event of a failure.
+		s.headLock.RLock()
+		newHeadRoot = s.headRoot()
+		s.headLock.RUnlock()
 	}
 	newAttHeadElapsedTime.Observe(float64(time.Since(start).Milliseconds()))
-	fcuArgs := &fcuConfig{
-		headState:     headState,
-		headRoot:      newHeadRoot,
-		headBlock:     headBlock,
-		proposingSlot: proposingSlot,
-	}
-	if s.inRegularSync() {
-		fcuArgs.attributes = s.getPayloadAttribute(ctx, headState, proposingSlot, newHeadRoot[:])
-	}
-	if fcuArgs.attributes != nil && s.shouldOverrideFCU(newHeadRoot, proposingSlot) {
-		return
-	}
-	if err := s.forkchoiceUpdateWithExecution(s.ctx, fcuArgs); err != nil {
+
+	changed, err := s.forkchoiceUpdateWithExecution(s.ctx, newHeadRoot, proposingSlot)
+	if err != nil {
 		log.WithError(err).Error("could not update forkchoice")
 	}
+	if changed {
+		s.headLock.RLock()
+		log.WithFields(logrus.Fields{
+			"oldHeadRoot": fmt.Sprintf("%#x", s.headRoot()),
+			"newHeadRoot": fmt.Sprintf("%#x", newHeadRoot),
+		}).Debug("Head changed due to attestations")
+		s.headLock.RUnlock()
+	}
 }

 // This processes fork choice attestations from the pool to account for validator votes and fork choice.
--- a/beacon-chain/blockchain/receive_attestation_test.go
+++ b/beacon-chain/blockchain/receive_attestation_test.go
@@ -36,28 +36,50 @@ func TestAttestationCheckPtState_FarFutureSlot(t *testing.T) {
 	require.ErrorContains(t, "exceeds max allowed value relative to the local clock", err)
 }

-func TestVerifyLMDFFGConsistent(t *testing.T) {
+func TestVerifyLMDFFGConsistent_NotOK(t *testing.T) {
 	service, tr := minimalTestService(t)
 	ctx := tr.ctx

-	f := service.cfg.ForkChoiceStore
-	fc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, r32, err := prepareForkchoiceState(ctx, 32, [32]byte{'a'}, params.BeaconConfig().ZeroHash, params.BeaconConfig().ZeroHash, fc, fc)
+	b32 := util.NewBeaconBlock()
+	b32.Block.Slot = 32
+	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b32)
+	r32, err := b32.Block.HashTreeRoot()
 	require.NoError(t, err)
-	require.NoError(t, f.InsertNode(ctx, state, r32))
-
-	state, r33, err := prepareForkchoiceState(ctx, 33, [32]byte{'b'}, r32, params.BeaconConfig().ZeroHash, fc, fc)
+	b33 := util.NewBeaconBlock()
+	b33.Block.Slot = 33
+	b33.Block.ParentRoot = r32[:]
+	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b33)
+	r33, err := b33.Block.HashTreeRoot()
 	require.NoError(t, err)
-	require.NoError(t, f.InsertNode(ctx, state, r33))

 	wanted := "FFG and LMD votes are not consistent"
 	a := util.NewAttestation()
 	a.Data.Target.Epoch = 1
-	a.Data.Target.Root = []byte{'c'}
+	a.Data.Target.Root = []byte{'a'}
 	a.Data.BeaconBlockRoot = r33[:]
 	require.ErrorContains(t, wanted, service.VerifyLmdFfgConsistency(context.Background(), a))
+}

+func TestVerifyLMDFFGConsistent_OK(t *testing.T) {
+	service, tr := minimalTestService(t)
+	ctx := tr.ctx
+
+	b32 := util.NewBeaconBlock()
+	b32.Block.Slot = 32
+	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b32)
+	r32, err := b32.Block.HashTreeRoot()
+	require.NoError(t, err)
+	b33 := util.NewBeaconBlock()
+	b33.Block.Slot = 33
+	b33.Block.ParentRoot = r32[:]
+	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b33)
+	r33, err := b33.Block.HashTreeRoot()
+	require.NoError(t, err)
+
+	a := util.NewAttestation()
+	a.Data.Target.Epoch = 1
 	a.Data.Target.Root = r32[:]
+	a.Data.BeaconBlockRoot = r33[:]
 	err = service.VerifyLmdFfgConsistency(context.Background(), a)
 	require.NoError(t, err, "Could not verify LMD and FFG votes to be consistent")
 }
@@ -106,13 +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(&postBlockProcessConfig{ctx, wsb, tRoot, [32]byte{}, 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())
@@ -162,13 +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(&postBlockProcessConfig{ctx, wsb, tRoot, [32]byte{}, 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/Show More
+++ b/Show More
Author	SHA1	Message	Date
nisdas	a8572352e1	fix build	2023-05-17 13:34:20 +08:00
nisdas	1848d76796	fix	2023-05-17 13:03:08 +08:00
@@ -1 +1 @@
 .0.0
 .1.0