Peer das core (#13877 )

* Bump `c-kzg-4844` lib to the `das` branch. * Implement `MerkleProofKZGCommitments`. * Implement `das-core.md`. * Use `peerdas.CustodyColumnSubnets` and `peerdas.CustodyColumns`. * `CustodyColumnSubnets`: Include `i` in the for loop. * Remove `computeSubscribedColumnSubnet`. * Remove `peerdas.CustodyColumns` out of the for loop.
Add Request And Response RPC Methods For Data Columns (#13909 )
2026-01-11 06:18:05 -05:00 · 2024-07-29 13:19:42 +02:00 · 2024-07-29 13:19:42 +02:00 · 2024-07-29 13:19:42 +02:00 · 2024-07-29 13:19:42 +02:00 · 2024-07-29 13:19:42 +02:00
959 changed files with 31575 additions and 61460 deletions
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -10,7 +10,6 @@
   in review.
 4. Note that PRs updating dependencies and new Go versions are not accepted.
   Please file an issue instead.
-5. A changelog entry is required for user facing issues.
 -->

 **What type of PR is this?**
@@ -29,9 +28,3 @@
 Fixes #

 **Other notes for review**
-
-**Acknowledgements**
-
- [ ] I have read [CONTRIBUTING.md](https://github.com/prysmaticlabs/prysm/blob/develop/CONTRIBUTING.md).
- [ ] I have made an appropriate entry to [CHANGELOG.md](https://github.com/prysmaticlabs/prysm/blob/develop/CHANGELOG.md).
- [ ] I have added a description to this PR with sufficient context for reviewers to understand this PR.
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -14,7 +14,7 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2

      - name: Go mod tidy checker
        id: gomodtidy
@@ -27,11 +27,11 @@ jobs:
      GO111MODULE: on
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2
      - name: Set up Go 1.22
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v3
        with:
-          go-version: '1.22.6'
+          go-version: '1.22.3'
      - name: Run Gosec Security Scanner
        run: | # https://github.com/securego/gosec/issues/469
          export PATH=$PATH:$(go env GOPATH)/bin
@@ -43,16 +43,16 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2

      - name: Set up Go 1.22
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v3
        with:
-          go-version: '1.22.6'
+          go-version: '1.22.3'
          id: go

      - name: Golangci-lint
-        uses: golangci/golangci-lint-action@v5
+        uses: golangci/golangci-lint-action@v3
        with:
          version: v1.55.2
          args: --config=.golangci.yml --out-${NO_FUTURE}format colored-line-number
@@ -62,13 +62,13 @@ jobs:
    runs-on: ubuntu-latest
    steps:
      - name: Set up Go 1.x
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v2
        with:
-          go-version: '1.22.6'
+          go-version: '1.22.3'
        id: go

      - name: Check out code into the Go module directory
-        uses: actions/checkout@v4
+        uses: actions/checkout@v2

      - name: Get dependencies
        run: |
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -6,7 +6,7 @@ run:
    - proto
    - tools/analyzers
  timeout: 10m
-  go: '1.22.6'
+  go: '1.22.3'

 linters:
  enable-all: true
--- a/.policy.yml
+++ b/.policy.yml
@@ -26,6 +26,7 @@ approval_rules:
      only_changed_files:
        paths:
          - "*pb.go"
+          - "*pb.gw.go"
          - "*.bazel"
    options:
      ignore_commits_by:
@@ -68,6 +69,7 @@ approval_rules:
      changed_files:
        ignore:
          - "*pb.go"
+          - "*pb.gw.go"
          - "*.bazel"
    options:
      ignore_commits_by:
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -55,6 +55,13 @@ alias(
    visibility = ["//visibility:public"],
 )

+# Protobuf gRPC gateway compiler
+alias(
+    name = "grpc_gateway_proto_compiler",
+    actual = "@com_github_grpc_ecosystem_grpc_gateway_v2//protoc-gen-grpc-gateway:go_gen_grpc_gateway",
+    visibility = ["//visibility:public"],
+)
+
 gometalinter(
    name = "gometalinter",
    config = "//:.gometalinter.json",
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -6,9 +6,6 @@ Excited by our work and want to get involved in building out our sharding releas

 You can explore our [Open Issues](https://github.com/prysmaticlabs/prysm/issues) in-the works for our different releases. Feel free to fork our repo and start creating PR’s after assigning yourself to an issue of interest. We are always chatting on [Discord](https://discord.gg/CTYGPUJ) drop us a line there if you want to get more involved or have any questions on our implementation!

-> [!IMPORTANT] 
-> Please, **do not send pull requests for trivial changes**, such as typos, these will be rejected. These types of pull requests incur a cost to reviewers and do not provide much value to the project. If you are unsure, please open an issue first to discuss the change.
-
 ## Contribution Steps

 **1. Set up Prysm following the instructions in README.md.**
@@ -123,19 +120,15 @@ $ git push myrepo feature-in-progress-branch

 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. Add an entry to CHANGELOG.md.**
+**16. Create a pull request.**

-If your change is user facing, you must include a CHANGELOG.md entry. See the [Maintaining CHANGELOG.md](#maintaining-changelogmd) section for more information.
+Navigate your browser to https://github.com/prysmaticlabs/prysm and click on the new pull request button. In the “base” box on the left, leave the default selection “base master”, the branch that you want your changes to be applied to. In the “compare” box on the right, select feature-in-progress-branch, the branch containing the changes you want to apply. You will then be asked to answer a few questions about your pull request. After you complete the questionnaire, the pull request will appear in the list of pull requests at https://github.com/prysmaticlabs/prysm/pulls.

-**17. Create a pull request.**
-
-Navigate your browser to https://github.com/prysmaticlabs/prysm and click on the new pull request button. In the “base” box on the left, leave the default selection “base master”, the branch that you want your changes to be applied to. In the “compare” box on the right, select feature-in-progress-branch, the branch containing the changes you want to apply. You will then be asked to answer a few questions about your pull request. After you complete the questionnaire, the pull request will appear in the list of pull requests at https://github.com/prysmaticlabs/prysm/pulls. Ensure that you have added an entry to CHANGELOG.md if your PR is a user-facing change. See the [Maintaining CHANGELOG.md](#maintaining-changelogmd) section for more information.
-
-**18. Respond to comments by Core Contributors.**
+**17. Respond to comments by Core Contributors.**

 Core Contributors may ask questions and request that you make edits. If you set notifications at the top of the page to “not watching,” you will still be notified by email whenever someone comments on the page of a pull request you have created. If you are asked to modify your pull request, repeat steps 8 through 15, then leave a comment to notify the Core Contributors that the pull request is ready for further review.

-**19. If the number of commits becomes excessive, you may be asked to squash your commits.**
+**18. If the number of commits becomes excessive, you may be asked to squash your commits.**

 You can do this with an interactive rebase. Start by running the following command to determine the commit that is the base of your branch...

@@ -143,7 +136,7 @@ Core Contributors may ask questions and request that you make edits. If you set
 $ git merge-base feature-in-progress-branch prysm/master
 ```

-**20. The previous command will return a commit-hash that you should use in the following command.**
+**19. The previous command will return a commit-hash that you should use in the following command.**

 ```
 $ git rebase -i commit-hash
@@ -167,30 +160,13 @@ squash  hash 	add a feature

 Save and close the file, then a commit command will appear in the terminal that squashes the smaller commits into one. Check to be sure the commit message accurately reflects your changes and then hit enter to execute it.

-**21. Update your pull request with the following command.**
+**20. Update your pull request with the following command.**

 ```
 $ git push myrepo feature-in-progress-branch -f
 ```

-**22.  Finally, again leave a comment to the Core Contributors on the pull request to let them know that the pull request has been updated.**
-
-## Maintaining CHANGELOG.md
-
-This project follows the changelog guidelines from [keepachangelog.com](https://keepachangelog.com/en/1.1.0/).
-
-All PRs with user facing changes should have an entry in the CHANGELOG.md file and the change should be categorized in the appropriate category within the "Unreleased" section. The categories are:
-
-  `Added` for new features.
-  `Changed` for changes in existing functionality.
-  `Deprecated` for soon-to-be removed features.
-  `Removed` for now removed features.
-  `Fixed` for any bug fixes.
-  `Security` in case of vulnerabilities. Please see the [Security Policy](SECURITY.md) for responsible disclosure before adding a change with this category.
-
-### Releasing
-
-When a new release is made, the "Unreleased" section should be moved to a new section with the release version and the current date. Then a new "Unreleased" section is made at the top of the file with the categories listed above.
+**21.  Finally, again leave a comment to the Core Contributors on the pull request to let them know that the pull request has been updated.**

 ## Contributor Responsibilities

--- a/34
+++ b/34
@@ -101,9 +101,9 @@ http_archive(

 http_archive(
    name = "aspect_bazel_lib",
-    sha256 = "a272d79bb0ac6b6965aa199b1f84333413452e87f043b53eca7f347a23a478e8",
-    strip_prefix = "bazel-lib-2.9.3",
-    url = "https://github.com/bazel-contrib/bazel-lib/releases/download/v2.9.3/bazel-lib-v2.9.3.tar.gz",
+    sha256 = "f5ea76682b209cc0bd90d0f5a3b26d2f7a6a2885f0c5f615e72913f4805dbb0d",
+    strip_prefix = "bazel-lib-2.5.0",
+    url = "https://github.com/aspect-build/bazel-lib/releases/download/v2.5.0/bazel-lib-v2.5.0.tar.gz",
 )

 load("@aspect_bazel_lib//lib:repositories.bzl", "aspect_bazel_lib_dependencies", "aspect_bazel_lib_register_toolchains")
@@ -165,7 +165,7 @@ load("@rules_oci//oci:pull.bzl", "oci_pull")
 oci_pull(
    name = "linux_debian11_multiarch_base",  # Debian bullseye
    digest = "sha256:b82f113425c5b5c714151aaacd8039bc141821cdcd3c65202d42bdf9c43ae60b",  # 2023-12-12
-    image = "gcr.io/prysmaticlabs/distroless/cc-debian11",
+    image = "gcr.io/distroless/cc-debian11",
    platforms = [
        "linux/amd64",
        "linux/arm64/v8",
@@ -227,7 +227,7 @@ filegroup(
    url = "https://github.com/ethereum/EIPs/archive/5480440fe51742ed23342b68cf106cefd427e39d.tar.gz",
 )

-consensus_spec_version = "v1.5.0-alpha.8"
+consensus_spec_version = "v1.5.0-alpha.3"

 bls_test_version = "v0.1.1"

@@ -243,7 +243,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    integrity = "sha256-BsGIbEyJuYrzhShGl0tHhR4lP5Qwno8R3k8a6YBR/DA=",
+    integrity = "sha256-+byv+GUOQytex5GgtjBGVoNDseJZbiBdAjEtlgCbjEo=",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/general.tar.gz" % consensus_spec_version,
 )

@@ -259,7 +259,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    integrity = "sha256-DkdvhPP2KiqUOpwFXQIFDCWCwsUDIC/xhTBD+TZevm0=",
+    integrity = "sha256-JJUy/jT1h3kGQkinTuzL7gMOA1+qgmPgJXVrYuH63Cg=",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/minimal.tar.gz" % consensus_spec_version,
 )

@@ -275,7 +275,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    integrity = "sha256-vkZqV0HB8A2Uc56C1Us/p5G57iaHL+zw2No93Xt6M/4=",
+    integrity = "sha256-T2VM4Qd0SwgGnTjWxjOX297DqEsovO9Ueij1UEJy48Y=",
    url = "https://github.com/ethereum/consensus-spec-tests/releases/download/%s/mainnet.tar.gz" % consensus_spec_version,
 )

@@ -290,7 +290,7 @@ filegroup(
    visibility = ["//visibility:public"],
 )
    """,
-    integrity = "sha256-D/HPAW61lKqjoWwl7N0XvhdX+67dCEFAy8JxVzqBGtU=",
+    integrity = "sha256-OP9BCBcQ7i+93bwj7ktY8pZ5uWsGjgTe4XTp7BDhX+I=",
    strip_prefix = "consensus-specs-" + consensus_spec_version[1:],
    url = "https://github.com/ethereum/consensus-specs/archive/refs/tags/%s.tar.gz" % consensus_spec_version,
 )
@@ -342,22 +342,6 @@ filegroup(
    url = "https://github.com/eth-clients/holesky/archive/874c199423ccd180607320c38cbaca05d9a1573a.tar.gz",  # 2024-06-18
 )

-http_archive(
-    name = "sepolia_testnet",
-    build_file_content = """
-filegroup(
-    name = "configs",
-    srcs = [
-        "metadata/config.yaml",
-    ],
-    visibility = ["//visibility:public"],
-)
-""",
-    integrity = "sha256-cY/UgpCcYEhQf7JefD65FI8tn/A+rAvKhcm2/qiVdqY=",
-    strip_prefix = "sepolia-f2c219a93c4491cee3d90c18f2f8e82aed850eab",
-    url = "https://github.com/eth-clients/sepolia/archive/f2c219a93c4491cee3d90c18f2f8e82aed850eab.tar.gz",  # 2024-09-19
-)
-
 http_archive(
    name = "com_google_protobuf",
    sha256 = "9bd87b8280ef720d3240514f884e56a712f2218f0d693b48050c836028940a42",
--- a/api/client/builder/BUILD.bazel
+++ b/api/client/builder/BUILD.bazel
@@ -21,7 +21,6 @@ go_library(
        "//encoding/bytesutil:go_default_library",
        "//math:go_default_library",
        "//monitoring/tracing:go_default_library",
-        "//monitoring/tracing/trace:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//runtime/version:go_default_library",
@@ -29,6 +28,7 @@ go_library(
        "@com_github_pkg_errors//:go_default_library",
        "@com_github_prysmaticlabs_fastssz//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
+        "@io_opencensus_go//trace:go_default_library",
        "@org_golang_google_protobuf//proto:go_default_library",
    ],
 )
--- a/api/client/builder/client.go
+++ b/api/client/builder/client.go
@@ -19,11 +19,11 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	v1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 	log "github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 const (
@@ -146,7 +146,7 @@ func (c *Client) do(ctx context.Context, method string, path string, body io.Rea

 	u := c.baseURL.ResolveReference(&url.URL{Path: path})

-	span.SetAttributes(trace.StringAttribute("url", u.String()),
+	span.AddAttributes(trace.StringAttribute("url", u.String()),
 		trace.StringAttribute("method", method))

 	req, err := http.NewRequestWithContext(ctx, method, u.String(), body)
@@ -259,7 +259,7 @@ func (c *Client) GetHeader(ctx context.Context, slot primitives.Slot, parentHash
 func (c *Client) RegisterValidator(ctx context.Context, svr []*ethpb.SignedValidatorRegistrationV1) error {
 	ctx, span := trace.StartSpan(ctx, "builder.client.RegisterValidator")
 	defer span.End()
-	span.SetAttributes(trace.Int64Attribute("num_reqs", int64(len(svr))))
+	span.AddAttributes(trace.Int64Attribute("num_reqs", int64(len(svr))))

 	if len(svr) == 0 {
 		err := errors.Wrap(errMalformedRequest, "empty validator registration list")
@@ -278,11 +278,7 @@ func (c *Client) RegisterValidator(ctx context.Context, svr []*ethpb.SignedValid
 	}

 	_, err = c.do(ctx, http.MethodPost, postRegisterValidatorPath, bytes.NewBuffer(body))
-	if err != nil {
-		return err
-	}
-	log.WithField("num_registrations", len(svr)).Info("successfully registered validator(s) on builder")
-	return nil
+	return err
 }

 var errResponseVersionMismatch = errors.New("builder API response uses a different version than requested in " + api.VersionHeader + " header")
--- a/api/gateway/BUILD.bazel
+++ b/api/gateway/BUILD.bazel
@@ -0,0 +1,43 @@
+load("@prysm//tools/go:def.bzl", "go_library", "go_test")
+
+go_library(
+    name = "go_default_library",
+    srcs = [
+        "gateway.go",
+        "log.go",
+        "modifiers.go",
+        "options.go",
+    ],
+    importpath = "github.com/prysmaticlabs/prysm/v5/api/gateway",
+    visibility = [
+        "//beacon-chain:__subpackages__",
+        "//validator:__subpackages__",
+    ],
+    deps = [
+        "//api/server/middleware: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_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",
+    ],
+)
+
+go_test(
+    name = "go_default_test",
+    srcs = ["gateway_test.go"],
+    embed = [":go_default_library"],
+    deps = [
+        "//cmd/beacon-chain/flags: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",
+        "@com_github_urfave_cli_v2//:go_default_library",
+    ],
+)
--- a/api/gateway/gateway.go
+++ b/api/gateway/gateway.go
@@ -0,0 +1,212 @@
+// Package gateway defines a grpc-gateway server that serves HTTP-JSON traffic and acts a proxy between HTTP and gRPC.
+package gateway
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/gorilla/mux"
+	gwruntime "github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/v5/api/server/middleware"
+	"github.com/prysmaticlabs/prysm/v5/runtime"
+	"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)
+
+// PbMux serves grpc-gateway requests for selected patterns using registered protobuf handlers.
+type PbMux struct {
+	Registrations []PbHandlerRegistration // Protobuf registrations to be registered in Mux.
+	Patterns      []string                // URL patterns that will be handled by Mux.
+	Mux           *gwruntime.ServeMux     // The router that will be used for grpc-gateway requests.
+}
+
+// PbHandlerRegistration is a function that registers a protobuf handler.
+type PbHandlerRegistration func(context.Context, *gwruntime.ServeMux, *grpc.ClientConn) error
+
+// MuxHandler is a function that implements the mux handler functionality.
+type MuxHandler func(
+	h http.HandlerFunc,
+	w http.ResponseWriter,
+	req *http.Request,
+)
+
+// 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
+}
+
+// Gateway is the gRPC gateway to serve HTTP JSON traffic as a proxy and forward it to the gRPC server.
+type Gateway struct {
+	cfg          *config
+	conn         *grpc.ClientConn
+	server       *http.Server
+	cancel       context.CancelFunc
+	ctx          context.Context
+	startFailure error
+}
+
+// New returns a new instance of the Gateway.
+func New(ctx context.Context, opts ...Option) (*Gateway, error) {
+	g := &Gateway{
+		ctx: ctx,
+		cfg: &config{},
+	}
+	for _, opt := range opts {
+		if err := opt(g); err != nil {
+			return nil, err
+		}
+	}
+	if g.cfg.router == nil {
+		g.cfg.router = mux.NewRouter()
+	}
+	return g, nil
+}
+
+// Start the gateway service.
+func (g *Gateway) Start() {
+	ctx, cancel := context.WithCancel(g.ctx)
+	g.cancel = cancel
+
+	conn, err := g.dial(ctx, "tcp", g.cfg.remoteAddr)
+	if err != nil {
+		log.WithError(err).Error("Failed to connect to gRPC server")
+		g.startFailure = err
+		return
+	}
+	g.conn = conn
+
+	for _, h := range g.cfg.pbHandlers {
+		for _, r := range h.Registrations {
+			if err := r(ctx, h.Mux, g.conn); err != nil {
+				log.WithError(err).Error("Failed to register handler")
+				g.startFailure = err
+				return
+			}
+		}
+		for _, p := range h.Patterns {
+			g.cfg.router.PathPrefix(p).Handler(h.Mux)
+		}
+	}
+
+	corsMux := middleware.CorsHandler(g.cfg.allowedOrigins).Middleware(g.cfg.router)
+
+	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.server = &http.Server{
+		Addr:              g.cfg.gatewayAddr,
+		Handler:           corsMux,
+		ReadHeaderTimeout: time.Second,
+	}
+
+	go func() {
+		log.WithField("address", g.cfg.gatewayAddr).Info("Starting gRPC gateway")
+		if err := g.server.ListenAndServe(); err != http.ErrServerClosed {
+			log.WithError(err).Error("Failed to start gRPC gateway")
+			g.startFailure = err
+			return
+		}
+	}()
+}
+
+// Status of grpc gateway. Returns an error if this service is unhealthy.
+func (g *Gateway) Status() error {
+	if g.startFailure != nil {
+		return g.startFailure
+	}
+	if s := g.conn.GetState(); s != connectivity.Ready {
+		return fmt.Errorf("grpc server is %s", s)
+	}
+	return nil
+}
+
+// Stop the gateway with a graceful shutdown.
+func (g *Gateway) Stop() error {
+	if g.server != nil {
+		shutdownCtx, shutdownCancel := context.WithTimeout(g.ctx, 2*time.Second)
+		defer shutdownCancel()
+		if err := g.server.Shutdown(shutdownCtx); err != nil {
+			if errors.Is(err, context.DeadlineExceeded) {
+				log.Warn("Existing connections terminated")
+			} else {
+				log.WithError(err).Error("Failed to gracefully shut down server")
+			}
+		}
+	}
+	if g.cancel != nil {
+		g.cancel()
+	}
+	return nil
+}
+
+// dial the gRPC server.
+func (g *Gateway) dial(ctx context.Context, network, addr string) (*grpc.ClientConn, error) {
+	switch network {
+	case "tcp":
+		return g.dialTCP(ctx, addr)
+	case "unix":
+		return g.dialUnix(ctx, addr)
+	default:
+		return nil, fmt.Errorf("unsupported network type %q", network)
+	}
+}
+
+// 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
+	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...)
+}
+
+// dialUnix creates a client connection via a unix domain socket.
+// "addr" must be a valid path to the socket.
+func (g *Gateway) dialUnix(ctx context.Context, addr string) (*grpc.ClientConn, error) {
+	d := func(addr string, timeout time.Duration) (net.Conn, error) {
+		return net.DialTimeout("unix", addr, timeout)
+	}
+	f := func(ctx context.Context, addr string) (net.Conn, error) {
+		if deadline, ok := ctx.Deadline(); ok {
+			return d(addr, time.Until(deadline))
+		}
+		return d(addr, 0)
+	}
+	opts := []grpc.DialOption{
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+		grpc.WithContextDialer(f),
+		grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(int(g.cfg.maxCallRecvMsgSize))),
+	}
+	return grpc.DialContext(ctx, addr, opts...)
+}
--- a/api/gateway/gateway_test.go
+++ b/api/gateway/gateway_test.go
@@ -0,0 +1,107 @@
+package gateway
+
+import (
+	"context"
+	"flag"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"net/url"
+	"testing"
+
+	"github.com/gorilla/mux"
+	"github.com/prysmaticlabs/prysm/v5/cmd/beacon-chain/flags"
+	"github.com/prysmaticlabs/prysm/v5/testing/assert"
+	"github.com/prysmaticlabs/prysm/v5/testing/require"
+	logTest "github.com/sirupsen/logrus/hooks/test"
+	"github.com/urfave/cli/v2"
+)
+
+func TestGateway_Customized(t *testing.T) {
+	r := mux.NewRouter()
+	cert := "cert"
+	origins := []string{"origin"}
+	size := uint64(100)
+
+	opts := []Option{
+		WithRouter(r),
+		WithRemoteCert(cert),
+		WithAllowedOrigins(origins),
+		WithMaxCallRecvMsgSize(size),
+		WithMuxHandler(func(
+			_ http.HandlerFunc,
+			_ http.ResponseWriter,
+			_ *http.Request,
+		) {
+		}),
+	}
+
+	g, err := New(context.Background(), opts...)
+	require.NoError(t, err)
+
+	assert.Equal(t, r, g.cfg.router)
+	assert.Equal(t, cert, g.cfg.remoteCert)
+	require.Equal(t, 1, len(g.cfg.allowedOrigins))
+	assert.Equal(t, origins[0], g.cfg.allowedOrigins[0])
+	assert.Equal(t, size, g.cfg.maxCallRecvMsgSize)
+}
+
+func TestGateway_StartStop(t *testing.T) {
+	hook := logTest.NewGlobal()
+
+	app := cli.App{}
+	set := flag.NewFlagSet("test", 0)
+	ctx := cli.NewContext(&app, set, nil)
+
+	gatewayPort := ctx.Int(flags.GRPCGatewayPort.Name)
+	gatewayHost := ctx.String(flags.GRPCGatewayHost.Name)
+	rpcHost := ctx.String(flags.RPCHost.Name)
+	selfAddress := fmt.Sprintf("%s:%d", rpcHost, ctx.Int(flags.RPCPort.Name))
+	gatewayAddress := fmt.Sprintf("%s:%d", gatewayHost, gatewayPort)
+
+	opts := []Option{
+		WithGatewayAddr(gatewayAddress),
+		WithRemoteAddr(selfAddress),
+		WithMuxHandler(func(
+			_ http.HandlerFunc,
+			_ http.ResponseWriter,
+			_ *http.Request,
+		) {
+		}),
+	}
+
+	g, err := New(context.Background(), opts...)
+	require.NoError(t, err)
+
+	g.Start()
+	go func() {
+		require.LogsContain(t, hook, "Starting gRPC gateway")
+		require.LogsDoNotContain(t, hook, "Starting API middleware")
+	}()
+	err = g.Stop()
+	require.NoError(t, err)
+}
+
+func TestGateway_NilHandler_NotFoundHandlerRegistered(t *testing.T) {
+	app := cli.App{}
+	set := flag.NewFlagSet("test", 0)
+	ctx := cli.NewContext(&app, set, nil)
+
+	gatewayPort := ctx.Int(flags.GRPCGatewayPort.Name)
+	gatewayHost := ctx.String(flags.GRPCGatewayHost.Name)
+	rpcHost := ctx.String(flags.RPCHost.Name)
+	selfAddress := fmt.Sprintf("%s:%d", rpcHost, ctx.Int(flags.RPCPort.Name))
+	gatewayAddress := fmt.Sprintf("%s:%d", gatewayHost, gatewayPort)
+
+	opts := []Option{
+		WithGatewayAddr(gatewayAddress),
+		WithRemoteAddr(selfAddress),
+	}
+
+	g, err := New(context.Background(), opts...)
+	require.NoError(t, err)
+
+	writer := httptest.NewRecorder()
+	g.cfg.router.ServeHTTP(writer, &http.Request{Method: "GET", Host: "localhost", URL: &url.URL{Path: "/foo"}})
+	assert.Equal(t, http.StatusNotFound, writer.Code)
+}
--- a/api/gateway/log.go
+++ b/api/gateway/log.go
@@ -0,0 +1,5 @@
+package gateway
+
+import "github.com/sirupsen/logrus"
+
+var log = logrus.WithField("prefix", "gateway")
--- a/api/gateway/modifiers.go
+++ b/api/gateway/modifiers.go
@@ -0,0 +1,30 @@
+package gateway
+
+import (
+	"context"
+	"net/http"
+	"strconv"
+
+	gwruntime "github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+	"google.golang.org/protobuf/proto"
+)
+
+func HttpResponseModifier(ctx context.Context, w http.ResponseWriter, _ proto.Message) error {
+	md, ok := gwruntime.ServerMetadataFromContext(ctx)
+	if !ok {
+		return nil
+	}
+	// set http status code
+	if vals := md.HeaderMD.Get("x-http-code"); len(vals) > 0 {
+		code, err := strconv.Atoi(vals[0])
+		if err != nil {
+			return err
+		}
+		// delete the headers to not expose any grpc-metadata in http response
+		delete(md.HeaderMD, "x-http-code")
+		delete(w.Header(), "Grpc-Metadata-X-Http-Code")
+		w.WriteHeader(code)
+	}
+
+	return nil
+}
--- a/api/gateway/options.go
+++ b/api/gateway/options.go
@@ -0,0 +1,79 @@
+package gateway
+
+import (
+	"time"
+
+	"github.com/gorilla/mux"
+	gwruntime "github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
+)
+
+type Option func(g *Gateway) error
+
+func WithPbHandlers(handlers []*PbMux) Option {
+	return func(g *Gateway) error {
+		g.cfg.pbHandlers = handlers
+		return nil
+	}
+}
+
+func WithMuxHandler(m MuxHandler) Option {
+	return func(g *Gateway) error {
+		g.cfg.muxHandler = m
+		return nil
+	}
+}
+
+func WithGatewayAddr(addr string) Option {
+	return func(g *Gateway) error {
+		g.cfg.gatewayAddr = addr
+		return nil
+	}
+}
+
+func WithRemoteAddr(addr string) Option {
+	return func(g *Gateway) error {
+		g.cfg.remoteAddr = addr
+		return nil
+	}
+}
+
+// WithRouter allows adding a custom mux router to the gateway.
+func WithRouter(r *mux.Router) Option {
+	return func(g *Gateway) error {
+		g.cfg.router = r
+		return nil
+	}
+}
+
+// WithAllowedOrigins allows adding a set of allowed origins to the gateway.
+func WithAllowedOrigins(origins []string) Option {
+	return func(g *Gateway) error {
+		g.cfg.allowedOrigins = origins
+		return nil
+	}
+}
+
+// WithRemoteCert allows adding a custom certificate to the gateway,
+func WithRemoteCert(cert string) Option {
+	return func(g *Gateway) error {
+		g.cfg.remoteCert = cert
+		return nil
+	}
+}
+
+// WithMaxCallRecvMsgSize allows specifying the maximum allowed gRPC message size.
+func WithMaxCallRecvMsgSize(size uint64) Option {
+	return func(g *Gateway) error {
+		g.cfg.maxCallRecvMsgSize = size
+		return nil
+	}
+}
+
+// WithTimeout allows changing the timeout value for API calls.
+func WithTimeout(seconds uint64) Option {
+	return func(g *Gateway) error {
+		g.cfg.timeout = time.Second * time.Duration(seconds)
+		gwruntime.DefaultContextTimeout = time.Second * time.Duration(seconds)
+		return nil
+	}
+}
--- a/api/grpc/BUILD.bazel
+++ b/api/grpc/BUILD.bazel
@@ -22,7 +22,9 @@ go_test(
    deps = [
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
+        "@com_github_grpc_ecosystem_grpc_gateway_v2//runtime:go_default_library",
        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
+        "@org_golang_google_grpc//:go_default_library",
        "@org_golang_google_grpc//metadata:go_default_library",
    ],
 )
--- a/api/grpc/grpcutils.go
+++ b/api/grpc/grpcutils.go
@@ -2,6 +2,8 @@ package grpc

 import (
 	"context"
+	"encoding/json"
+	"fmt"
 	"strings"
 	"time"

@@ -79,3 +81,16 @@ func AppendHeaders(parent context.Context, headers []string) context.Context {
 	}
 	return parent
 }
+
+// AppendCustomErrorHeader sets a CustomErrorMetadataKey gRPC header on the passed in context,
+// using the passed in error data as the header's value. The data is serialized as JSON.
+func AppendCustomErrorHeader(ctx context.Context, errorData interface{}) error {
+	j, err := json.Marshal(errorData)
+	if err != nil {
+		return fmt.Errorf("could not marshal error data into JSON: %w", err)
+	}
+	if err := grpc.SetHeader(ctx, metadata.Pairs(CustomErrorMetadataKey, string(j))); err != nil {
+		return fmt.Errorf("could not set custom error header: %w", err)
+	}
+	return nil
+}
--- a/api/grpc/grpcutils_test.go
+++ b/api/grpc/grpcutils_test.go
@@ -2,11 +2,15 @@ package grpc

 import (
 	"context"
+	"encoding/json"
+	"strings"
 	"testing"

+	"github.com/grpc-ecosystem/grpc-gateway/v2/runtime"
 	"github.com/prysmaticlabs/prysm/v5/testing/assert"
 	"github.com/prysmaticlabs/prysm/v5/testing/require"
 	logTest "github.com/sirupsen/logrus/hooks/test"
+	"google.golang.org/grpc"
 	"google.golang.org/grpc/metadata"
 )

@@ -58,3 +62,17 @@ func TestAppendHeaders(t *testing.T) {
 		assert.Equal(t, "value=1", md.Get("first")[0])
 	})
 }
+
+func TestAppendCustomErrorHeader(t *testing.T) {
+	stream := &runtime.ServerTransportStream{}
+	ctx := grpc.NewContextWithServerTransportStream(context.Background(), stream)
+	data := &customErrorData{Message: "foo"}
+	require.NoError(t, AppendCustomErrorHeader(ctx, data))
+	// The stream used in test setup sets the metadata key in lowercase.
+	value, ok := stream.Header()[strings.ToLower(CustomErrorMetadataKey)]
+	require.Equal(t, true, ok, "Failed to retrieve custom error metadata value")
+	expected, err := json.Marshal(data)
+	require.NoError(t, err)
+	assert.Equal(t, string(expected), value[0])
+
+}
--- a/api/headers.go
+++ b/api/headers.go
@@ -1,7 +1,5 @@
 package api

-import "net/http"
-
 const (
 	VersionHeader                 = "Eth-Consensus-Version"
 	ExecutionPayloadBlindedHeader = "Eth-Execution-Payload-Blinded"
@@ -12,9 +10,3 @@ const (
 	EventStreamMediaType          = "text/event-stream"
 	KeepAlive                     = "keep-alive"
 )
-
-// SetSSEHeaders sets the headers needed for a server-sent event response.
-func SetSSEHeaders(w http.ResponseWriter) {
-	w.Header().Set("Content-Type", EventStreamMediaType)
-	w.Header().Set("Connection", KeepAlive)
-}
--- a/api/server/httprest/BUILD.bazel
+++ b/api/server/httprest/BUILD.bazel
@@ -1,31 +0,0 @@
-load("@prysm//tools/go:def.bzl", "go_library", "go_test")
-
-go_library(
-    name = "go_default_library",
-    srcs = [
-        "log.go",
-        "options.go",
-        "server.go",
-    ],
-    importpath = "github.com/prysmaticlabs/prysm/v5/api/server/httprest",
-    visibility = ["//visibility:public"],
-    deps = [
-        "//api/server/middleware:go_default_library",
-        "//runtime:go_default_library",
-        "@com_github_pkg_errors//:go_default_library",
-        "@com_github_sirupsen_logrus//:go_default_library",
-    ],
-)
-
-go_test(
-    name = "go_default_test",
-    srcs = ["server_test.go"],
-    embed = [":go_default_library"],
-    deps = [
-        "//cmd/beacon-chain/flags:go_default_library",
-        "//testing/assert:go_default_library",
-        "//testing/require:go_default_library",
-        "@com_github_sirupsen_logrus//hooks/test:go_default_library",
-        "@com_github_urfave_cli_v2//:go_default_library",
-    ],
-)
--- a/api/server/httprest/log.go
+++ b/api/server/httprest/log.go
@@ -1,5 +0,0 @@
-package httprest
-
-import "github.com/sirupsen/logrus"
-
-var log = logrus.WithField("prefix", "httprest")
--- a/api/server/httprest/options.go
+++ b/api/server/httprest/options.go
@@ -1,44 +0,0 @@
-package httprest
-
-import (
-	"time"
-
-	"net/http"
-
-	"github.com/prysmaticlabs/prysm/v5/api/server/middleware"
-)
-
-// Option is a http rest server functional parameter type.
-type Option func(g *Server) error
-
-// WithMiddlewares sets the list of middlewares to be applied on routes.
-func WithMiddlewares(mw []middleware.Middleware) Option {
-	return func(g *Server) error {
-		g.cfg.middlewares = mw
-		return nil
-	}
-}
-
-// WithHTTPAddr sets the full address ( host and port ) of the server.
-func WithHTTPAddr(addr string) Option {
-	return func(g *Server) error {
-		g.cfg.httpAddr = addr
-		return nil
-	}
-}
-
-// WithRouter sets the internal router of the server, this is required.
-func WithRouter(r *http.ServeMux) Option {
-	return func(g *Server) error {
-		g.cfg.router = r
-		return nil
-	}
-}
-
-// WithTimeout allows changing the timeout value for API calls.
-func WithTimeout(duration time.Duration) Option {
-	return func(g *Server) error {
-		g.cfg.timeout = duration
-		return nil
-	}
-}
--- a/api/server/httprest/server.go
+++ b/api/server/httprest/server.go
@@ -1,101 +0,0 @@
-package httprest
-
-import (
-	"context"
-	"net/http"
-	"time"
-
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v5/api/server/middleware"
-	"github.com/prysmaticlabs/prysm/v5/runtime"
-)
-
-var _ runtime.Service = (*Server)(nil)
-
-// Config parameters for setting up the http-rest service.
-type config struct {
-	httpAddr    string
-	middlewares []middleware.Middleware
-	router      http.Handler
-	timeout     time.Duration
-}
-
-// Server serves HTTP traffic.
-type Server struct {
-	cfg          *config
-	server       *http.Server
-	cancel       context.CancelFunc
-	ctx          context.Context
-	startFailure error
-}
-
-// New returns a new instance of the Server.
-func New(ctx context.Context, opts ...Option) (*Server, error) {
-	g := &Server{
-		ctx: ctx,
-		cfg: &config{},
-	}
-	for _, opt := range opts {
-		if err := opt(g); err != nil {
-			return nil, err
-		}
-	}
-	if g.cfg.router == nil {
-		return nil, errors.New("router option not configured")
-	}
-	var handler http.Handler
-	defaultReadHeaderTimeout := time.Second
-	handler = middleware.MiddlewareChain(g.cfg.router, g.cfg.middlewares)
-	if g.cfg.timeout > 0*time.Second {
-		defaultReadHeaderTimeout = g.cfg.timeout
-		handler = http.TimeoutHandler(handler, g.cfg.timeout, "request timed out")
-	}
-	g.server = &http.Server{
-		Addr:              g.cfg.httpAddr,
-		Handler:           handler,
-		ReadHeaderTimeout: defaultReadHeaderTimeout,
-	}
-
-	return g, nil
-}
-
-// Start the http rest service.
-func (g *Server) Start() {
-	g.ctx, g.cancel = context.WithCancel(g.ctx)
-
-	go func() {
-		log.WithField("address", g.cfg.httpAddr).Info("Starting HTTP server")
-		if err := g.server.ListenAndServe(); err != http.ErrServerClosed {
-			log.WithError(err).Error("Failed to start HTTP server")
-			g.startFailure = err
-			return
-		}
-	}()
-}
-
-// Status of the HTTP server. Returns an error if this service is unhealthy.
-func (g *Server) Status() error {
-	if g.startFailure != nil {
-		return g.startFailure
-	}
-	return nil
-}
-
-// Stop the HTTP server with a graceful shutdown.
-func (g *Server) Stop() error {
-	if g.server != nil {
-		shutdownCtx, shutdownCancel := context.WithTimeout(g.ctx, 2*time.Second)
-		defer shutdownCancel()
-		if err := g.server.Shutdown(shutdownCtx); err != nil {
-			if errors.Is(err, context.DeadlineExceeded) {
-				log.Warn("Existing connections terminated")
-			} else {
-				log.WithError(err).Error("Failed to gracefully shut down server")
-			}
-		}
-	}
-	if g.cancel != nil {
-		g.cancel()
-	}
-	return nil
-}
--- a/api/server/httprest/server_test.go
+++ b/api/server/httprest/server_test.go
@@ -1,71 +0,0 @@
-package httprest
-
-import (
-	"context"
-	"flag"
-	"fmt"
-	"net"
-	"net/http"
-	"net/http/httptest"
-	"net/url"
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v5/cmd/beacon-chain/flags"
-	"github.com/prysmaticlabs/prysm/v5/testing/assert"
-	"github.com/prysmaticlabs/prysm/v5/testing/require"
-	logTest "github.com/sirupsen/logrus/hooks/test"
-	"github.com/urfave/cli/v2"
-)
-
-func TestServer_StartStop(t *testing.T) {
-	hook := logTest.NewGlobal()
-
-	app := cli.App{}
-	set := flag.NewFlagSet("test", 0)
-	ctx := cli.NewContext(&app, set, nil)
-
-	port := ctx.Int(flags.HTTPServerPort.Name)
-	portStr := fmt.Sprintf("%d", port) // Convert port to string
-	host := ctx.String(flags.HTTPServerHost.Name)
-	address := net.JoinHostPort(host, portStr)
-	handler := http.NewServeMux()
-	opts := []Option{
-		WithHTTPAddr(address),
-		WithRouter(handler),
-	}
-
-	g, err := New(context.Background(), opts...)
-	require.NoError(t, err)
-
-	g.Start()
-	go func() {
-		require.LogsContain(t, hook, "Starting HTTP server")
-		require.LogsDoNotContain(t, hook, "Starting API middleware")
-	}()
-	err = g.Stop()
-	require.NoError(t, err)
-}
-
-func TestServer_NilHandler_NotFoundHandlerRegistered(t *testing.T) {
-	app := cli.App{}
-	set := flag.NewFlagSet("test", 0)
-	ctx := cli.NewContext(&app, set, nil)
-
-	handler := http.NewServeMux()
-	port := ctx.Int(flags.HTTPServerPort.Name)
-	portStr := fmt.Sprintf("%d", port) // Convert port to string
-	host := ctx.String(flags.HTTPServerHost.Name)
-	address := net.JoinHostPort(host, portStr)
-
-	opts := []Option{
-		WithHTTPAddr(address),
-		WithRouter(handler),
-	}
-
-	g, err := New(context.Background(), opts...)
-	require.NoError(t, err)
-
-	writer := httptest.NewRecorder()
-	g.cfg.router.ServeHTTP(writer, &http.Request{Method: "GET", Host: "localhost", URL: &url.URL{Path: "/foo"}})
-	assert.Equal(t, http.StatusNotFound, writer.Code)
-}
--- a/api/server/middleware/BUILD.bazel
+++ b/api/server/middleware/BUILD.bazel
@@ -8,7 +8,10 @@ go_library(
    ],
    importpath = "github.com/prysmaticlabs/prysm/v5/api/server/middleware",
    visibility = ["//visibility:public"],
-    deps = ["@com_github_rs_cors//:go_default_library"],
+    deps = [
+        "@com_github_gorilla_mux//:go_default_library",
+        "@com_github_rs_cors//:go_default_library",
+    ],
 )

 go_test(
--- a/api/server/middleware/middleware.go
+++ b/api/server/middleware/middleware.go
@@ -5,11 +5,10 @@ import (
 	"net/http"
 	"strings"

+	"github.com/gorilla/mux"
 	"github.com/rs/cors"
 )

-type Middleware func(http.Handler) http.Handler
-
 // 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) {
@@ -22,7 +21,7 @@ func NormalizeQueryValuesHandler(next http.Handler) http.Handler {
 }

 // CorsHandler sets the cors settings on api endpoints
-func CorsHandler(allowOrigins []string) Middleware {
+func CorsHandler(allowOrigins []string) mux.MiddlewareFunc {
 	c := cors.New(cors.Options{
 		AllowedOrigins:   allowOrigins,
 		AllowedMethods:   []string{http.MethodPost, http.MethodGet, http.MethodDelete, http.MethodOptions},
@@ -35,7 +34,7 @@ func CorsHandler(allowOrigins []string) Middleware {
 }

 // ContentTypeHandler checks request for the appropriate media types otherwise returning a http.StatusUnsupportedMediaType error
-func ContentTypeHandler(acceptedMediaTypes []string) Middleware {
+func ContentTypeHandler(acceptedMediaTypes []string) mux.MiddlewareFunc {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			// skip the GET request
@@ -68,7 +67,7 @@ func ContentTypeHandler(acceptedMediaTypes []string) Middleware {
 }

 // AcceptHeaderHandler checks if the client's response preference is handled
-func AcceptHeaderHandler(serverAcceptedTypes []string) Middleware {
+func AcceptHeaderHandler(serverAcceptedTypes []string) mux.MiddlewareFunc {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			acceptHeader := r.Header.Get("Accept")
@@ -111,15 +110,3 @@ func AcceptHeaderHandler(serverAcceptedTypes []string) Middleware {
 		})
 	}
 }
-
-func MiddlewareChain(h http.Handler, mw []Middleware) http.Handler {
-	if len(mw) < 1 {
-		return h
-	}
-
-	wrapped := h
-	for i := len(mw) - 1; i >= 0; i-- {
-		wrapped = mw[i](wrapped)
-	}
-	return wrapped
-}
--- a/api/server/structs/BUILD.bazel
+++ b/api/server/structs/BUILD.bazel
@@ -5,9 +5,7 @@ go_library(
    srcs = [
        "block.go",
        "conversions.go",
-        "conversions_blob.go",
        "conversions_block.go",
-        "conversions_lightclient.go",
        "conversions_state.go",
        "endpoints_beacon.go",
        "endpoints_blob.go",
@@ -35,9 +33,6 @@ go_library(
        "//encoding/bytesutil:go_default_library",
        "//math: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",
        "@com_github_ethereum_go_ethereum//common:go_default_library",
        "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
--- a/api/server/structs/block.go
+++ b/api/server/structs/block.go
@@ -317,96 +317,6 @@ type BlindedBeaconBlockBodyDeneb struct {
 	BlobKzgCommitments     []string                      `json:"blob_kzg_commitments"`
 }

-type SignedBeaconBlockContentsElectra struct {
-	SignedBlock *SignedBeaconBlockElectra `json:"signed_block"`
-	KzgProofs   []string                  `json:"kzg_proofs"`
-	Blobs       []string                  `json:"blobs"`
-}
-
-type BeaconBlockContentsElectra struct {
-	Block     *BeaconBlockElectra `json:"block"`
-	KzgProofs []string            `json:"kzg_proofs"`
-	Blobs     []string            `json:"blobs"`
-}
-
-type SignedBeaconBlockElectra struct {
-	Message   *BeaconBlockElectra `json:"message"`
-	Signature string              `json:"signature"`
-}
-
-var _ SignedMessageJsoner = &SignedBeaconBlockElectra{}
-
-func (s *SignedBeaconBlockElectra) MessageRawJson() ([]byte, error) {
-	return json.Marshal(s.Message)
-}
-
-func (s *SignedBeaconBlockElectra) SigString() string {
-	return s.Signature
-}
-
-type BeaconBlockElectra struct {
-	Slot          string                  `json:"slot"`
-	ProposerIndex string                  `json:"proposer_index"`
-	ParentRoot    string                  `json:"parent_root"`
-	StateRoot     string                  `json:"state_root"`
-	Body          *BeaconBlockBodyElectra `json:"body"`
-}
-
-type BeaconBlockBodyElectra struct {
-	RandaoReveal          string                        `json:"randao_reveal"`
-	Eth1Data              *Eth1Data                     `json:"eth1_data"`
-	Graffiti              string                        `json:"graffiti"`
-	ProposerSlashings     []*ProposerSlashing           `json:"proposer_slashings"`
-	AttesterSlashings     []*AttesterSlashingElectra    `json:"attester_slashings"`
-	Attestations          []*AttestationElectra         `json:"attestations"`
-	Deposits              []*Deposit                    `json:"deposits"`
-	VoluntaryExits        []*SignedVoluntaryExit        `json:"voluntary_exits"`
-	SyncAggregate         *SyncAggregate                `json:"sync_aggregate"`
-	ExecutionPayload      *ExecutionPayloadElectra      `json:"execution_payload"`
-	BLSToExecutionChanges []*SignedBLSToExecutionChange `json:"bls_to_execution_changes"`
-	BlobKzgCommitments    []string                      `json:"blob_kzg_commitments"`
-	ExecutionRequests     *ExecutionRequests            `json:"execution_requests"`
-}
-
-type BlindedBeaconBlockElectra struct {
-	Slot          string                         `json:"slot"`
-	ProposerIndex string                         `json:"proposer_index"`
-	ParentRoot    string                         `json:"parent_root"`
-	StateRoot     string                         `json:"state_root"`
-	Body          *BlindedBeaconBlockBodyElectra `json:"body"`
-}
-
-type SignedBlindedBeaconBlockElectra struct {
-	Message   *BlindedBeaconBlockElectra `json:"message"`
-	Signature string                     `json:"signature"`
-}
-
-var _ SignedMessageJsoner = &SignedBlindedBeaconBlockElectra{}
-
-func (s *SignedBlindedBeaconBlockElectra) MessageRawJson() ([]byte, error) {
-	return json.Marshal(s.Message)
-}
-
-func (s *SignedBlindedBeaconBlockElectra) SigString() string {
-	return s.Signature
-}
-
-type BlindedBeaconBlockBodyElectra struct {
-	RandaoReveal           string                         `json:"randao_reveal"`
-	Eth1Data               *Eth1Data                      `json:"eth1_data"`
-	Graffiti               string                         `json:"graffiti"`
-	ProposerSlashings      []*ProposerSlashing            `json:"proposer_slashings"`
-	AttesterSlashings      []*AttesterSlashingElectra     `json:"attester_slashings"`
-	Attestations           []*AttestationElectra          `json:"attestations"`
-	Deposits               []*Deposit                     `json:"deposits"`
-	VoluntaryExits         []*SignedVoluntaryExit         `json:"voluntary_exits"`
-	SyncAggregate          *SyncAggregate                 `json:"sync_aggregate"`
-	ExecutionPayloadHeader *ExecutionPayloadHeaderElectra `json:"execution_payload_header"`
-	BLSToExecutionChanges  []*SignedBLSToExecutionChange  `json:"bls_to_execution_changes"`
-	BlobKzgCommitments     []string                       `json:"blob_kzg_commitments"`
-	ExecutionRequests      *ExecutionRequests             `json:"execution_requests"`
-}
-
 type SignedBeaconBlockHeaderContainer struct {
 	Header    *SignedBeaconBlockHeader `json:"header"`
 	Root      string                   `json:"root"`
@@ -516,8 +426,6 @@ type ExecutionPayloadDeneb struct {
 	ExcessBlobGas string        `json:"excess_blob_gas"`
 }

-type ExecutionPayloadElectra = ExecutionPayloadDeneb
-
 type ExecutionPayloadHeaderDeneb struct {
 	ParentHash       string `json:"parent_hash"`
 	FeeRecipient     string `json:"fee_recipient"`
@@ -537,11 +445,3 @@ type ExecutionPayloadHeaderDeneb struct {
 	BlobGasUsed      string `json:"blob_gas_used"`
 	ExcessBlobGas    string `json:"excess_blob_gas"`
 }
-
-type ExecutionPayloadHeaderElectra = ExecutionPayloadHeaderDeneb
-
-type ExecutionRequests struct {
-	Deposits       []*DepositRequest       `json:"deposits"`
-	Withdrawals    []*WithdrawalRequest    `json:"withdrawals"`
-	Consolidations []*ConsolidationRequest `json:"consolidations"`
-}
--- a/api/server/structs/conversions.go
+++ b/api/server/structs/conversions.go
@@ -15,7 +15,6 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v5/math"
 	enginev1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
-	ethv1 "github.com/prysmaticlabs/prysm/v5/proto/eth/v1"
 	eth "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 )

@@ -341,42 +340,6 @@ func (a *AggregateAttestationAndProof) ToConsensus() (*eth.AggregateAttestationA
 	}, nil
 }

-func (s *SignedAggregateAttestationAndProofElectra) ToConsensus() (*eth.SignedAggregateAttestationAndProofElectra, error) {
-	msg, err := s.Message.ToConsensus()
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Message")
-	}
-	sig, err := bytesutil.DecodeHexWithLength(s.Signature, fieldparams.BLSSignatureLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Signature")
-	}
-
-	return &eth.SignedAggregateAttestationAndProofElectra{
-		Message:   msg,
-		Signature: sig,
-	}, nil
-}
-
-func (a *AggregateAttestationAndProofElectra) ToConsensus() (*eth.AggregateAttestationAndProofElectra, error) {
-	aggIndex, err := strconv.ParseUint(a.AggregatorIndex, 10, 64)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "AggregatorIndex")
-	}
-	agg, err := a.Aggregate.ToConsensus()
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Aggregate")
-	}
-	proof, err := bytesutil.DecodeHexWithLength(a.SelectionProof, 96)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "SelectionProof")
-	}
-	return &eth.AggregateAttestationAndProofElectra{
-		AggregatorIndex: primitives.ValidatorIndex(aggIndex),
-		Aggregate:       agg,
-		SelectionProof:  proof,
-	}, nil
-}
-
 func (a *Attestation) ToConsensus() (*eth.Attestation, error) {
 	aggBits, err := hexutil.Decode(a.AggregationBits)
 	if err != nil {
@@ -406,41 +369,6 @@ func AttFromConsensus(a *eth.Attestation) *Attestation {
 	}
 }

-func (a *AttestationElectra) ToConsensus() (*eth.AttestationElectra, error) {
-	aggBits, err := hexutil.Decode(a.AggregationBits)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "AggregationBits")
-	}
-	data, err := a.Data.ToConsensus()
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Data")
-	}
-	sig, err := bytesutil.DecodeHexWithLength(a.Signature, fieldparams.BLSSignatureLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Signature")
-	}
-	committeeBits, err := hexutil.Decode(a.CommitteeBits)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "CommitteeBits")
-	}
-
-	return &eth.AttestationElectra{
-		AggregationBits: aggBits,
-		Data:            data,
-		Signature:       sig,
-		CommitteeBits:   committeeBits,
-	}, nil
-}
-
-func AttElectraFromConsensus(a *eth.AttestationElectra) *AttestationElectra {
-	return &AttestationElectra{
-		AggregationBits: hexutil.Encode(a.AggregationBits),
-		Data:            AttDataFromConsensus(a.Data),
-		Signature:       hexutil.Encode(a.Signature),
-		CommitteeBits:   hexutil.Encode(a.CommitteeBits),
-	}
-}
-
 func (a *AttestationData) ToConsensus() (*eth.AttestationData, error) {
 	slot, err := strconv.ParseUint(a.Slot, 10, 64)
 	if err != nil {
@@ -695,18 +623,6 @@ func (s *AttesterSlashing) ToConsensus() (*eth.AttesterSlashing, error) {
 	return &eth.AttesterSlashing{Attestation_1: att1, Attestation_2: att2}, nil
 }

-func (s *AttesterSlashingElectra) ToConsensus() (*eth.AttesterSlashingElectra, error) {
-	att1, err := s.Attestation1.ToConsensus()
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Attestation1")
-	}
-	att2, err := s.Attestation2.ToConsensus()
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Attestation2")
-	}
-	return &eth.AttesterSlashingElectra{Attestation_1: att1, Attestation_2: att2}, nil
-}
-
 func (a *IndexedAttestation) ToConsensus() (*eth.IndexedAttestation, error) {
 	indices := make([]uint64, len(a.AttestingIndices))
 	var err error
@@ -732,31 +648,6 @@ func (a *IndexedAttestation) ToConsensus() (*eth.IndexedAttestation, error) {
 	}, nil
 }

-func (a *IndexedAttestationElectra) ToConsensus() (*eth.IndexedAttestationElectra, error) {
-	indices := make([]uint64, len(a.AttestingIndices))
-	var err error
-	for i, ix := range a.AttestingIndices {
-		indices[i], err = strconv.ParseUint(ix, 10, 64)
-		if err != nil {
-			return nil, server.NewDecodeError(err, fmt.Sprintf("AttestingIndices[%d]", i))
-		}
-	}
-	data, err := a.Data.ToConsensus()
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Data")
-	}
-	sig, err := bytesutil.DecodeHexWithLength(a.Signature, fieldparams.BLSSignatureLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Signature")
-	}
-
-	return &eth.IndexedAttestationElectra{
-		AttestingIndices: indices,
-		Data:             data,
-		Signature:        sig,
-	}, nil
-}
-
 func WithdrawalsFromConsensus(ws []*enginev1.Withdrawal) []*Withdrawal {
 	result := make([]*Withdrawal, len(ws))
 	for i, w := range ws {
@@ -774,126 +665,6 @@ func WithdrawalFromConsensus(w *enginev1.Withdrawal) *Withdrawal {
 	}
 }

-func WithdrawalRequestsFromConsensus(ws []*enginev1.WithdrawalRequest) []*WithdrawalRequest {
-	result := make([]*WithdrawalRequest, len(ws))
-	for i, w := range ws {
-		result[i] = WithdrawalRequestFromConsensus(w)
-	}
-	return result
-}
-
-func WithdrawalRequestFromConsensus(w *enginev1.WithdrawalRequest) *WithdrawalRequest {
-	return &WithdrawalRequest{
-		SourceAddress:   hexutil.Encode(w.SourceAddress),
-		ValidatorPubkey: hexutil.Encode(w.ValidatorPubkey),
-		Amount:          fmt.Sprintf("%d", w.Amount),
-	}
-}
-
-func (w *WithdrawalRequest) ToConsensus() (*enginev1.WithdrawalRequest, error) {
-	src, err := bytesutil.DecodeHexWithLength(w.SourceAddress, common.AddressLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "SourceAddress")
-	}
-	pubkey, err := bytesutil.DecodeHexWithLength(w.ValidatorPubkey, fieldparams.BLSPubkeyLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "ValidatorPubkey")
-	}
-	amount, err := strconv.ParseUint(w.Amount, 10, 64)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Amount")
-	}
-	return &enginev1.WithdrawalRequest{
-		SourceAddress:   src,
-		ValidatorPubkey: pubkey,
-		Amount:          amount,
-	}, nil
-}
-
-func ConsolidationRequestsFromConsensus(cs []*enginev1.ConsolidationRequest) []*ConsolidationRequest {
-	result := make([]*ConsolidationRequest, len(cs))
-	for i, c := range cs {
-		result[i] = ConsolidationRequestFromConsensus(c)
-	}
-	return result
-}
-
-func ConsolidationRequestFromConsensus(c *enginev1.ConsolidationRequest) *ConsolidationRequest {
-	return &ConsolidationRequest{
-		SourceAddress: hexutil.Encode(c.SourceAddress),
-		SourcePubkey:  hexutil.Encode(c.SourcePubkey),
-		TargetPubkey:  hexutil.Encode(c.TargetPubkey),
-	}
-}
-
-func (c *ConsolidationRequest) ToConsensus() (*enginev1.ConsolidationRequest, error) {
-	srcAddress, err := bytesutil.DecodeHexWithLength(c.SourceAddress, common.AddressLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "SourceAddress")
-	}
-	srcPubkey, err := bytesutil.DecodeHexWithLength(c.SourcePubkey, fieldparams.BLSPubkeyLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "SourcePubkey")
-	}
-	targetPubkey, err := bytesutil.DecodeHexWithLength(c.TargetPubkey, fieldparams.BLSPubkeyLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "TargetPubkey")
-	}
-	return &enginev1.ConsolidationRequest{
-		SourceAddress: srcAddress,
-		SourcePubkey:  srcPubkey,
-		TargetPubkey:  targetPubkey,
-	}, nil
-}
-
-func DepositRequestsFromConsensus(ds []*enginev1.DepositRequest) []*DepositRequest {
-	result := make([]*DepositRequest, len(ds))
-	for i, d := range ds {
-		result[i] = DepositRequestFromConsensus(d)
-	}
-	return result
-}
-
-func DepositRequestFromConsensus(d *enginev1.DepositRequest) *DepositRequest {
-	return &DepositRequest{
-		Pubkey:                hexutil.Encode(d.Pubkey),
-		WithdrawalCredentials: hexutil.Encode(d.WithdrawalCredentials),
-		Amount:                fmt.Sprintf("%d", d.Amount),
-		Signature:             hexutil.Encode(d.Signature),
-		Index:                 fmt.Sprintf("%d", d.Index),
-	}
-}
-
-func (d *DepositRequest) ToConsensus() (*enginev1.DepositRequest, error) {
-	pubkey, err := bytesutil.DecodeHexWithLength(d.Pubkey, fieldparams.BLSPubkeyLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Pubkey")
-	}
-	withdrawalCredentials, err := bytesutil.DecodeHexWithLength(d.WithdrawalCredentials, fieldparams.RootLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "WithdrawalCredentials")
-	}
-	amount, err := strconv.ParseUint(d.Amount, 10, 64)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Amount")
-	}
-	sig, err := bytesutil.DecodeHexWithLength(d.Signature, fieldparams.BLSSignatureLength)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Signature")
-	}
-	index, err := strconv.ParseUint(d.Index, 10, 64)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Index")
-	}
-	return &enginev1.DepositRequest{
-		Pubkey:                pubkey,
-		WithdrawalCredentials: withdrawalCredentials,
-		Amount:                amount,
-		Signature:             sig,
-		Index:                 index,
-	}, nil
-}
-
 func ProposerSlashingsToConsensus(src []*ProposerSlashing) ([]*eth.ProposerSlashing, error) {
 	if src == nil {
 		return nil, errNilValue
@@ -1159,138 +930,6 @@ func AttesterSlashingFromConsensus(src *eth.AttesterSlashing) *AttesterSlashing
 	}
 }

-func AttesterSlashingsElectraToConsensus(src []*AttesterSlashingElectra) ([]*eth.AttesterSlashingElectra, error) {
-	if src == nil {
-		return nil, errNilValue
-	}
-	err := slice.VerifyMaxLength(src, 2)
-	if err != nil {
-		return nil, err
-	}
-
-	attesterSlashings := make([]*eth.AttesterSlashingElectra, len(src))
-	for i, s := range src {
-		if s == nil {
-			return nil, server.NewDecodeError(errNilValue, fmt.Sprintf("[%d]", i))
-		}
-		if s.Attestation1 == nil {
-			return nil, server.NewDecodeError(errNilValue, fmt.Sprintf("[%d].Attestation1", i))
-		}
-		if s.Attestation2 == nil {
-			return nil, server.NewDecodeError(errNilValue, fmt.Sprintf("[%d].Attestation2", i))
-		}
-
-		a1Sig, err := bytesutil.DecodeHexWithLength(s.Attestation1.Signature, fieldparams.BLSSignatureLength)
-		if err != nil {
-			return nil, server.NewDecodeError(err, fmt.Sprintf("[%d].Attestation1.Signature", i))
-		}
-		err = slice.VerifyMaxLength(s.Attestation1.AttestingIndices, 2048)
-		if err != nil {
-			return nil, server.NewDecodeError(err, fmt.Sprintf("[%d].Attestation1.AttestingIndices", i))
-		}
-		a1AttestingIndices := make([]uint64, len(s.Attestation1.AttestingIndices))
-		for j, ix := range s.Attestation1.AttestingIndices {
-			attestingIndex, err := strconv.ParseUint(ix, 10, 64)
-			if err != nil {
-				return nil, server.NewDecodeError(err, fmt.Sprintf("[%d].Attestation1.AttestingIndices[%d]", i, j))
-			}
-			a1AttestingIndices[j] = attestingIndex
-		}
-		a1Data, err := s.Attestation1.Data.ToConsensus()
-		if err != nil {
-			return nil, server.NewDecodeError(err, fmt.Sprintf("[%d].Attestation1.Data", i))
-		}
-		a2Sig, err := bytesutil.DecodeHexWithLength(s.Attestation2.Signature, fieldparams.BLSSignatureLength)
-		if err != nil {
-			return nil, server.NewDecodeError(err, fmt.Sprintf("[%d].Attestation2.Signature", i))
-		}
-		err = slice.VerifyMaxLength(s.Attestation2.AttestingIndices, 2048)
-		if err != nil {
-			return nil, server.NewDecodeError(err, fmt.Sprintf("[%d].Attestation2.AttestingIndices", i))
-		}
-		a2AttestingIndices := make([]uint64, len(s.Attestation2.AttestingIndices))
-		for j, ix := range s.Attestation2.AttestingIndices {
-			attestingIndex, err := strconv.ParseUint(ix, 10, 64)
-			if err != nil {
-				return nil, server.NewDecodeError(err, fmt.Sprintf("[%d].Attestation2.AttestingIndices[%d]", i, j))
-			}
-			a2AttestingIndices[j] = attestingIndex
-		}
-		a2Data, err := s.Attestation2.Data.ToConsensus()
-		if err != nil {
-			return nil, server.NewDecodeError(err, fmt.Sprintf("[%d].Attestation2.Data", i))
-		}
-		attesterSlashings[i] = &eth.AttesterSlashingElectra{
-			Attestation_1: &eth.IndexedAttestationElectra{
-				AttestingIndices: a1AttestingIndices,
-				Data:             a1Data,
-				Signature:        a1Sig,
-			},
-			Attestation_2: &eth.IndexedAttestationElectra{
-				AttestingIndices: a2AttestingIndices,
-				Data:             a2Data,
-				Signature:        a2Sig,
-			},
-		}
-	}
-	return attesterSlashings, nil
-}
-
-func AttesterSlashingsElectraFromConsensus(src []*eth.AttesterSlashingElectra) []*AttesterSlashingElectra {
-	attesterSlashings := make([]*AttesterSlashingElectra, len(src))
-	for i, s := range src {
-		attesterSlashings[i] = AttesterSlashingElectraFromConsensus(s)
-	}
-	return attesterSlashings
-}
-
-func AttesterSlashingElectraFromConsensus(src *eth.AttesterSlashingElectra) *AttesterSlashingElectra {
-	a1AttestingIndices := make([]string, len(src.Attestation_1.AttestingIndices))
-	for j, ix := range src.Attestation_1.AttestingIndices {
-		a1AttestingIndices[j] = fmt.Sprintf("%d", ix)
-	}
-	a2AttestingIndices := make([]string, len(src.Attestation_2.AttestingIndices))
-	for j, ix := range src.Attestation_2.AttestingIndices {
-		a2AttestingIndices[j] = fmt.Sprintf("%d", ix)
-	}
-	return &AttesterSlashingElectra{
-		Attestation1: &IndexedAttestationElectra{
-			AttestingIndices: a1AttestingIndices,
-			Data: &AttestationData{
-				Slot:            fmt.Sprintf("%d", src.Attestation_1.Data.Slot),
-				CommitteeIndex:  fmt.Sprintf("%d", src.Attestation_1.Data.CommitteeIndex),
-				BeaconBlockRoot: hexutil.Encode(src.Attestation_1.Data.BeaconBlockRoot),
-				Source: &Checkpoint{
-					Epoch: fmt.Sprintf("%d", src.Attestation_1.Data.Source.Epoch),
-					Root:  hexutil.Encode(src.Attestation_1.Data.Source.Root),
-				},
-				Target: &Checkpoint{
-					Epoch: fmt.Sprintf("%d", src.Attestation_1.Data.Target.Epoch),
-					Root:  hexutil.Encode(src.Attestation_1.Data.Target.Root),
-				},
-			},
-			Signature: hexutil.Encode(src.Attestation_1.Signature),
-		},
-		Attestation2: &IndexedAttestationElectra{
-			AttestingIndices: a2AttestingIndices,
-			Data: &AttestationData{
-				Slot:            fmt.Sprintf("%d", src.Attestation_2.Data.Slot),
-				CommitteeIndex:  fmt.Sprintf("%d", src.Attestation_2.Data.CommitteeIndex),
-				BeaconBlockRoot: hexutil.Encode(src.Attestation_2.Data.BeaconBlockRoot),
-				Source: &Checkpoint{
-					Epoch: fmt.Sprintf("%d", src.Attestation_2.Data.Source.Epoch),
-					Root:  hexutil.Encode(src.Attestation_2.Data.Source.Root),
-				},
-				Target: &Checkpoint{
-					Epoch: fmt.Sprintf("%d", src.Attestation_2.Data.Target.Epoch),
-					Root:  hexutil.Encode(src.Attestation_2.Data.Target.Root),
-				},
-			},
-			Signature: hexutil.Encode(src.Attestation_2.Signature),
-		},
-	}
-}
-
 func AttsToConsensus(src []*Attestation) ([]*eth.Attestation, error) {
 	if src == nil {
 		return nil, errNilValue
@@ -1318,33 +957,6 @@ func AttsFromConsensus(src []*eth.Attestation) []*Attestation {
 	return atts
 }

-func AttsElectraToConsensus(src []*AttestationElectra) ([]*eth.AttestationElectra, error) {
-	if src == nil {
-		return nil, errNilValue
-	}
-	err := slice.VerifyMaxLength(src, 8)
-	if err != nil {
-		return nil, err
-	}
-
-	atts := make([]*eth.AttestationElectra, len(src))
-	for i, a := range src {
-		atts[i], err = a.ToConsensus()
-		if err != nil {
-			return nil, server.NewDecodeError(err, fmt.Sprintf("[%d]", i))
-		}
-	}
-	return atts, nil
-}
-
-func AttsElectraFromConsensus(src []*eth.AttestationElectra) []*AttestationElectra {
-	atts := make([]*AttestationElectra, len(src))
-	for i, a := range src {
-		atts[i] = AttElectraFromConsensus(a)
-	}
-	return atts
-}
-
 func DepositsToConsensus(src []*Deposit) ([]*eth.Deposit, error) {
 	if src == nil {
 		return nil, errNilValue
@@ -1475,74 +1087,3 @@ func DepositSnapshotFromConsensus(ds *eth.DepositSnapshot) *DepositSnapshot {
 		ExecutionBlockHeight: fmt.Sprintf("%d", ds.ExecutionDepth),
 	}
 }
-
-func PendingDepositsFromConsensus(ds []*eth.PendingDeposit) []*PendingDeposit {
-	deposits := make([]*PendingDeposit, len(ds))
-	for i, d := range ds {
-		deposits[i] = &PendingDeposit{
-			Pubkey:                hexutil.Encode(d.PublicKey),
-			WithdrawalCredentials: hexutil.Encode(d.WithdrawalCredentials),
-			Amount:                fmt.Sprintf("%d", d.Amount),
-			Signature:             hexutil.Encode(d.Signature),
-			Slot:                  fmt.Sprintf("%d", d.Slot),
-		}
-	}
-	return deposits
-}
-
-func PendingPartialWithdrawalsFromConsensus(ws []*eth.PendingPartialWithdrawal) []*PendingPartialWithdrawal {
-	withdrawals := make([]*PendingPartialWithdrawal, len(ws))
-	for i, w := range ws {
-		withdrawals[i] = &PendingPartialWithdrawal{
-			Index:             fmt.Sprintf("%d", w.Index),
-			Amount:            fmt.Sprintf("%d", w.Amount),
-			WithdrawableEpoch: fmt.Sprintf("%d", w.WithdrawableEpoch),
-		}
-	}
-	return withdrawals
-}
-
-func PendingConsolidationsFromConsensus(cs []*eth.PendingConsolidation) []*PendingConsolidation {
-	consolidations := make([]*PendingConsolidation, len(cs))
-	for i, c := range cs {
-		consolidations[i] = &PendingConsolidation{
-			SourceIndex: fmt.Sprintf("%d", c.SourceIndex),
-			TargetIndex: fmt.Sprintf("%d", c.TargetIndex),
-		}
-	}
-	return consolidations
-}
-
-func HeadEventFromV1(event *ethv1.EventHead) *HeadEvent {
-	return &HeadEvent{
-		Slot:                      fmt.Sprintf("%d", event.Slot),
-		Block:                     hexutil.Encode(event.Block),
-		State:                     hexutil.Encode(event.State),
-		EpochTransition:           event.EpochTransition,
-		ExecutionOptimistic:       event.ExecutionOptimistic,
-		PreviousDutyDependentRoot: hexutil.Encode(event.PreviousDutyDependentRoot),
-		CurrentDutyDependentRoot:  hexutil.Encode(event.CurrentDutyDependentRoot),
-	}
-}
-
-func FinalizedCheckpointEventFromV1(event *ethv1.EventFinalizedCheckpoint) *FinalizedCheckpointEvent {
-	return &FinalizedCheckpointEvent{
-		Block:               hexutil.Encode(event.Block),
-		State:               hexutil.Encode(event.State),
-		Epoch:               fmt.Sprintf("%d", event.Epoch),
-		ExecutionOptimistic: event.ExecutionOptimistic,
-	}
-}
-
-func EventChainReorgFromV1(event *ethv1.EventChainReorg) *ChainReorgEvent {
-	return &ChainReorgEvent{
-		Slot:                fmt.Sprintf("%d", event.Slot),
-		Depth:               fmt.Sprintf("%d", event.Depth),
-		OldHeadBlock:        hexutil.Encode(event.OldHeadBlock),
-		NewHeadBlock:        hexutil.Encode(event.NewHeadBlock),
-		OldHeadState:        hexutil.Encode(event.OldHeadState),
-		NewHeadState:        hexutil.Encode(event.NewHeadState),
-		Epoch:               fmt.Sprintf("%d", event.Epoch),
-		ExecutionOptimistic: event.ExecutionOptimistic,
-	}
-}
--- a/api/server/structs/conversions_blob.go
+++ b/api/server/structs/conversions_blob.go
@@ -1,61 +0,0 @@
-package structs
-
-import (
-	"strconv"
-
-	"github.com/prysmaticlabs/prysm/v5/api/server"
-	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	eth "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
-)
-
-func (sc *Sidecar) ToConsensus() (*eth.BlobSidecar, error) {
-	if sc == nil {
-		return nil, errNilValue
-	}
-
-	index, err := strconv.ParseUint(sc.Index, 10, 64)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Index")
-	}
-
-	blob, err := bytesutil.DecodeHexWithLength(sc.Blob, 131072)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "Blob")
-	}
-
-	kzgCommitment, err := bytesutil.DecodeHexWithLength(sc.KzgCommitment, 48)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "KzgCommitment")
-	}
-
-	kzgProof, err := bytesutil.DecodeHexWithLength(sc.KzgProof, 48)
-	if err != nil {
-		return nil, server.NewDecodeError(err, "KzgProof")
-	}
-
-	header, err := sc.SignedBeaconBlockHeader.ToConsensus()
-	if err != nil {
-		return nil, server.NewDecodeError(err, "SignedBeaconBlockHeader")
-	}
-
-	// decode the commitment inclusion proof
-	var commitmentInclusionProof [][]byte
-	for _, proof := range sc.CommitmentInclusionProof {
-		proofBytes, err := bytesutil.DecodeHexWithLength(proof, 32)
-		if err != nil {
-			return nil, server.NewDecodeError(err, "CommitmentInclusionProof")
-		}
-		commitmentInclusionProof = append(commitmentInclusionProof, proofBytes)
-	}
-
-	bsc := &eth.BlobSidecar{
-		Index:                    index,
-		Blob:                     blob,
-		KzgCommitment:            kzgCommitment,
-		KzgProof:                 kzgProof,
-		SignedBlockHeader:        header,
-		CommitmentInclusionProof: commitmentInclusionProof,
-	}
-
-	return bsc, nil
-}
--- a/api/server/structs/conversions_block.go
+++ b/api/server/structs/conversions_block.go
--- a/api/server/structs/conversions_lightclient.go
+++ b/api/server/structs/conversions_lightclient.go
@@ -1,127 +0,0 @@
-package structs
-
-import (
-	"encoding/json"
-	"fmt"
-	"strconv"
-
-	"github.com/ethereum/go-ethereum/common/hexutil"
-	"github.com/pkg/errors"
-	v1 "github.com/prysmaticlabs/prysm/v5/proto/eth/v1"
-	v2 "github.com/prysmaticlabs/prysm/v5/proto/eth/v2"
-	"github.com/prysmaticlabs/prysm/v5/proto/migration"
-)
-
-func LightClientUpdateFromConsensus(update *v2.LightClientUpdate) (*LightClientUpdate, error) {
-	attestedHeader, err := lightClientHeaderContainerToJSON(update.AttestedHeader)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not marshal attested light client header")
-	}
-	finalizedHeader, err := lightClientHeaderContainerToJSON(update.FinalizedHeader)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not marshal finalized light client header")
-	}
-
-	return &LightClientUpdate{
-		AttestedHeader:          attestedHeader,
-		NextSyncCommittee:       SyncCommitteeFromConsensus(migration.V2SyncCommitteeToV1Alpha1(update.NextSyncCommittee)),
-		NextSyncCommitteeBranch: branchToJSON(update.NextSyncCommitteeBranch),
-		FinalizedHeader:         finalizedHeader,
-		FinalityBranch:          branchToJSON(update.FinalityBranch),
-		SyncAggregate:           syncAggregateToJSON(update.SyncAggregate),
-		SignatureSlot:           strconv.FormatUint(uint64(update.SignatureSlot), 10),
-	}, nil
-}
-
-func LightClientFinalityUpdateFromConsensus(update *v2.LightClientFinalityUpdate) (*LightClientFinalityUpdate, error) {
-	attestedHeader, err := lightClientHeaderContainerToJSON(update.AttestedHeader)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not marshal attested light client header")
-	}
-	finalizedHeader, err := lightClientHeaderContainerToJSON(update.FinalizedHeader)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not marshal finalized light client header")
-	}
-
-	return &LightClientFinalityUpdate{
-		AttestedHeader:  attestedHeader,
-		FinalizedHeader: finalizedHeader,
-		FinalityBranch:  branchToJSON(update.FinalityBranch),
-		SyncAggregate:   syncAggregateToJSON(update.SyncAggregate),
-		SignatureSlot:   strconv.FormatUint(uint64(update.SignatureSlot), 10),
-	}, nil
-}
-
-func LightClientOptimisticUpdateFromConsensus(update *v2.LightClientOptimisticUpdate) (*LightClientOptimisticUpdate, error) {
-	attestedHeader, err := lightClientHeaderContainerToJSON(update.AttestedHeader)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not marshal attested light client header")
-	}
-
-	return &LightClientOptimisticUpdate{
-		AttestedHeader: attestedHeader,
-		SyncAggregate:  syncAggregateToJSON(update.SyncAggregate),
-		SignatureSlot:  strconv.FormatUint(uint64(update.SignatureSlot), 10),
-	}, nil
-}
-
-func branchToJSON(branchBytes [][]byte) []string {
-	if branchBytes == nil {
-		return nil
-	}
-	branch := make([]string, len(branchBytes))
-	for i, root := range branchBytes {
-		branch[i] = hexutil.Encode(root)
-	}
-	return branch
-}
-
-func syncAggregateToJSON(input *v1.SyncAggregate) *SyncAggregate {
-	return &SyncAggregate{
-		SyncCommitteeBits:      hexutil.Encode(input.SyncCommitteeBits),
-		SyncCommitteeSignature: hexutil.Encode(input.SyncCommitteeSignature),
-	}
-}
-
-func lightClientHeaderContainerToJSON(container *v2.LightClientHeaderContainer) (json.RawMessage, error) {
-	// In the case that a finalizedHeader is nil.
-	if container == nil {
-		return nil, nil
-	}
-
-	beacon, err := container.GetBeacon()
-	if err != nil {
-		return nil, errors.Wrap(err, "could not get beacon block header")
-	}
-
-	var header any
-
-	switch t := (container.Header).(type) {
-	case *v2.LightClientHeaderContainer_HeaderAltair:
-		header = &LightClientHeader{Beacon: BeaconBlockHeaderFromConsensus(migration.V1HeaderToV1Alpha1(beacon))}
-	case *v2.LightClientHeaderContainer_HeaderCapella:
-		execution, err := ExecutionPayloadHeaderCapellaFromConsensus(t.HeaderCapella.Execution)
-		if err != nil {
-			return nil, err
-		}
-		header = &LightClientHeaderCapella{
-			Beacon:          BeaconBlockHeaderFromConsensus(migration.V1HeaderToV1Alpha1(beacon)),
-			Execution:       execution,
-			ExecutionBranch: branchToJSON(t.HeaderCapella.ExecutionBranch),
-		}
-	case *v2.LightClientHeaderContainer_HeaderDeneb:
-		execution, err := ExecutionPayloadHeaderDenebFromConsensus(t.HeaderDeneb.Execution)
-		if err != nil {
-			return nil, err
-		}
-		header = &LightClientHeaderDeneb{
-			Beacon:          BeaconBlockHeaderFromConsensus(migration.V1HeaderToV1Alpha1(beacon)),
-			Execution:       execution,
-			ExecutionBranch: branchToJSON(t.HeaderDeneb.ExecutionBranch),
-		}
-	default:
-		return nil, fmt.Errorf("unsupported header type %T", t)
-	}
-
-	return json.Marshal(header)
-}
--- a/api/server/structs/conversions_state.go
+++ b/api/server/structs/conversions_state.go
@@ -593,185 +593,3 @@ func BeaconStateDenebFromConsensus(st beaconState.BeaconState) (*BeaconStateDene
 		HistoricalSummaries:          hs,
 	}, nil
 }
-
-func BeaconStateElectraFromConsensus(st beaconState.BeaconState) (*BeaconStateElectra, error) {
-	srcBr := st.BlockRoots()
-	br := make([]string, len(srcBr))
-	for i, r := range srcBr {
-		br[i] = hexutil.Encode(r)
-	}
-	srcSr := st.StateRoots()
-	sr := make([]string, len(srcSr))
-	for i, r := range srcSr {
-		sr[i] = hexutil.Encode(r)
-	}
-	srcHr, err := st.HistoricalRoots()
-	if err != nil {
-		return nil, err
-	}
-	hr := make([]string, len(srcHr))
-	for i, r := range srcHr {
-		hr[i] = hexutil.Encode(r)
-	}
-	srcVotes := st.Eth1DataVotes()
-	votes := make([]*Eth1Data, len(srcVotes))
-	for i, e := range srcVotes {
-		votes[i] = Eth1DataFromConsensus(e)
-	}
-	srcVals := st.Validators()
-	vals := make([]*Validator, len(srcVals))
-	for i, v := range srcVals {
-		vals[i] = ValidatorFromConsensus(v)
-	}
-	srcBals := st.Balances()
-	bals := make([]string, len(srcBals))
-	for i, b := range srcBals {
-		bals[i] = fmt.Sprintf("%d", b)
-	}
-	srcRm := st.RandaoMixes()
-	rm := make([]string, len(srcRm))
-	for i, m := range srcRm {
-		rm[i] = hexutil.Encode(m)
-	}
-	srcSlashings := st.Slashings()
-	slashings := make([]string, len(srcSlashings))
-	for i, s := range srcSlashings {
-		slashings[i] = fmt.Sprintf("%d", s)
-	}
-	srcPrevPart, err := st.PreviousEpochParticipation()
-	if err != nil {
-		return nil, err
-	}
-	prevPart := make([]string, len(srcPrevPart))
-	for i, p := range srcPrevPart {
-		prevPart[i] = fmt.Sprintf("%d", p)
-	}
-	srcCurrPart, err := st.CurrentEpochParticipation()
-	if err != nil {
-		return nil, err
-	}
-	currPart := make([]string, len(srcCurrPart))
-	for i, p := range srcCurrPart {
-		currPart[i] = fmt.Sprintf("%d", p)
-	}
-	srcIs, err := st.InactivityScores()
-	if err != nil {
-		return nil, err
-	}
-	is := make([]string, len(srcIs))
-	for i, s := range srcIs {
-		is[i] = fmt.Sprintf("%d", s)
-	}
-	currSc, err := st.CurrentSyncCommittee()
-	if err != nil {
-		return nil, err
-	}
-	nextSc, err := st.NextSyncCommittee()
-	if err != nil {
-		return nil, err
-	}
-	execData, err := st.LatestExecutionPayloadHeader()
-	if err != nil {
-		return nil, err
-	}
-	srcPayload, ok := execData.Proto().(*enginev1.ExecutionPayloadHeaderDeneb)
-	if !ok {
-		return nil, errPayloadHeaderNotFound
-	}
-	payload, err := ExecutionPayloadHeaderElectraFromConsensus(srcPayload)
-	if err != nil {
-		return nil, err
-	}
-	srcHs, err := st.HistoricalSummaries()
-	if err != nil {
-		return nil, err
-	}
-	hs := make([]*HistoricalSummary, len(srcHs))
-	for i, s := range srcHs {
-		hs[i] = HistoricalSummaryFromConsensus(s)
-	}
-	nwi, err := st.NextWithdrawalIndex()
-	if err != nil {
-		return nil, err
-	}
-	nwvi, err := st.NextWithdrawalValidatorIndex()
-	if err != nil {
-		return nil, err
-	}
-	drsi, err := st.DepositRequestsStartIndex()
-	if err != nil {
-		return nil, err
-	}
-	dbtc, err := st.DepositBalanceToConsume()
-	if err != nil {
-		return nil, err
-	}
-	ebtc, err := st.ExitBalanceToConsume()
-	if err != nil {
-		return nil, err
-	}
-	eee, err := st.EarliestExitEpoch()
-	if err != nil {
-		return nil, err
-	}
-	cbtc, err := st.ConsolidationBalanceToConsume()
-	if err != nil {
-		return nil, err
-	}
-	ece, err := st.EarliestConsolidationEpoch()
-	if err != nil {
-		return nil, err
-	}
-	pbd, err := st.PendingDeposits()
-	if err != nil {
-		return nil, err
-	}
-	ppw, err := st.PendingPartialWithdrawals()
-	if err != nil {
-		return nil, err
-	}
-	pc, err := st.PendingConsolidations()
-	if err != nil {
-		return nil, err
-	}
-
-	return &BeaconStateElectra{
-		GenesisTime:                   fmt.Sprintf("%d", st.GenesisTime()),
-		GenesisValidatorsRoot:         hexutil.Encode(st.GenesisValidatorsRoot()),
-		Slot:                          fmt.Sprintf("%d", st.Slot()),
-		Fork:                          ForkFromConsensus(st.Fork()),
-		LatestBlockHeader:             BeaconBlockHeaderFromConsensus(st.LatestBlockHeader()),
-		BlockRoots:                    br,
-		StateRoots:                    sr,
-		HistoricalRoots:               hr,
-		Eth1Data:                      Eth1DataFromConsensus(st.Eth1Data()),
-		Eth1DataVotes:                 votes,
-		Eth1DepositIndex:              fmt.Sprintf("%d", st.Eth1DepositIndex()),
-		Validators:                    vals,
-		Balances:                      bals,
-		RandaoMixes:                   rm,
-		Slashings:                     slashings,
-		PreviousEpochParticipation:    prevPart,
-		CurrentEpochParticipation:     currPart,
-		JustificationBits:             hexutil.Encode(st.JustificationBits()),
-		PreviousJustifiedCheckpoint:   CheckpointFromConsensus(st.PreviousJustifiedCheckpoint()),
-		CurrentJustifiedCheckpoint:    CheckpointFromConsensus(st.CurrentJustifiedCheckpoint()),
-		FinalizedCheckpoint:           CheckpointFromConsensus(st.FinalizedCheckpoint()),
-		InactivityScores:              is,
-		CurrentSyncCommittee:          SyncCommitteeFromConsensus(currSc),
-		NextSyncCommittee:             SyncCommitteeFromConsensus(nextSc),
-		LatestExecutionPayloadHeader:  payload,
-		NextWithdrawalIndex:           fmt.Sprintf("%d", nwi),
-		NextWithdrawalValidatorIndex:  fmt.Sprintf("%d", nwvi),
-		HistoricalSummaries:           hs,
-		DepositRequestsStartIndex:     fmt.Sprintf("%d", drsi),
-		DepositBalanceToConsume:       fmt.Sprintf("%d", dbtc),
-		ExitBalanceToConsume:          fmt.Sprintf("%d", ebtc),
-		EarliestExitEpoch:             fmt.Sprintf("%d", eee),
-		ConsolidationBalanceToConsume: fmt.Sprintf("%d", cbtc),
-		EarliestConsolidationEpoch:    fmt.Sprintf("%d", ece),
-		PendingDeposits:               PendingDepositsFromConsensus(pbd),
-		PendingPartialWithdrawals:     PendingPartialWithdrawalsFromConsensus(ppw),
-		PendingConsolidations:         PendingConsolidationsFromConsensus(pc),
-	}, nil
-}
--- a/api/server/structs/endpoints_beacon.go
+++ b/api/server/structs/endpoints_beacon.go
@@ -21,8 +21,7 @@ type GetCommitteesResponse struct {
 }

 type ListAttestationsResponse struct {
-	Version string          `json:"version,omitempty"`
-	Data    json.RawMessage `json:"data"`
+	Data []*Attestation `json:"data"`
 }

 type SubmitAttestationsRequest struct {
@@ -134,13 +133,6 @@ type GetBlockAttestationsResponse struct {
 	Data                []*Attestation `json:"data"`
 }

-type GetBlockAttestationsV2Response struct {
-	Version             string          `json:"version"`
-	ExecutionOptimistic bool            `json:"execution_optimistic"`
-	Finalized           bool            `json:"finalized"`
-	Data                json.RawMessage `json:"data"` // Accepts both `Attestation` and `AttestationElectra` types
-}
-
 type GetStateRootResponse struct {
 	ExecutionOptimistic bool       `json:"execution_optimistic"`
 	Finalized           bool       `json:"finalized"`
@@ -177,8 +169,7 @@ type BLSToExecutionChangesPoolResponse struct {
 }

 type GetAttesterSlashingsResponse struct {
-	Version string          `json:"version,omitempty"`
-	Data    json.RawMessage `json:"data"` // Accepts both `[]*AttesterSlashing` and `[]*AttesterSlashingElectra` types
+	Data []*AttesterSlashing `json:"data"`
 }

 type GetProposerSlashingsResponse struct {
@@ -234,19 +225,3 @@ type IndividualVote struct {
 	InclusionDistance                string `json:"inclusion_distance"`
 	InactivityScore                  string `json:"inactivity_score"`
 }
-
-type ChainHead struct {
-	HeadSlot                   string `json:"head_slot"`
-	HeadEpoch                  string `json:"head_epoch"`
-	HeadBlockRoot              string `json:"head_block_root"`
-	FinalizedSlot              string `json:"finalized_slot"`
-	FinalizedEpoch             string `json:"finalized_epoch"`
-	FinalizedBlockRoot         string `json:"finalized_block_root"`
-	JustifiedSlot              string `json:"justified_slot"`
-	JustifiedEpoch             string `json:"justified_epoch"`
-	JustifiedBlockRoot         string `json:"justified_block_root"`
-	PreviousJustifiedSlot      string `json:"previous_justified_slot"`
-	PreviousJustifiedEpoch     string `json:"previous_justified_epoch"`
-	PreviousJustifiedBlockRoot string `json:"previous_justified_block_root"`
-	OptimisticStatus           bool   `json:"optimistic_status"`
-}
--- a/api/server/structs/endpoints_blob.go
+++ b/api/server/structs/endpoints_blob.go
@@ -12,12 +12,3 @@ type Sidecar struct {
 	KzgProof                 string                   `json:"kzg_proof"`
 	CommitmentInclusionProof []string                 `json:"kzg_commitment_inclusion_proof"`
 }
-
-type BlobSidecars struct {
-	Sidecars []*Sidecar `json:"sidecars"`
-}
-
-type PublishBlobsRequest struct {
-	BlobSidecars *BlobSidecars `json:"blob_sidecars"`
-	BlockRoot    string        `json:"block_root"`
-}
--- a/api/server/structs/endpoints_events.go
+++ b/api/server/structs/endpoints_events.go
@@ -96,7 +96,21 @@ type LightClientFinalityUpdateEvent struct {
 	Data    *LightClientFinalityUpdate `json:"data"`
 }

+type LightClientFinalityUpdate struct {
+	AttestedHeader  *BeaconBlockHeader `json:"attested_header"`
+	FinalizedHeader *BeaconBlockHeader `json:"finalized_header"`
+	FinalityBranch  []string           `json:"finality_branch"`
+	SyncAggregate   *SyncAggregate     `json:"sync_aggregate"`
+	SignatureSlot   string             `json:"signature_slot"`
+}
+
 type LightClientOptimisticUpdateEvent struct {
 	Version string                       `json:"version"`
 	Data    *LightClientOptimisticUpdate `json:"data"`
 }
+
+type LightClientOptimisticUpdate struct {
+	AttestedHeader *BeaconBlockHeader `json:"attested_header"`
+	SyncAggregate  *SyncAggregate     `json:"sync_aggregate"`
+	SignatureSlot  string             `json:"signature_slot"`
+}
--- a/api/server/structs/endpoints_lightclient.go
+++ b/api/server/structs/endpoints_lightclient.go
@@ -1,73 +1,31 @@
 package structs

-import "encoding/json"
-
-type LightClientHeader struct {
-	Beacon *BeaconBlockHeader `json:"beacon"`
-}
-
-type LightClientHeaderCapella struct {
-	Beacon          *BeaconBlockHeader             `json:"beacon"`
-	Execution       *ExecutionPayloadHeaderCapella `json:"execution"`
-	ExecutionBranch []string                       `json:"execution_branch"`
-}
-
-type LightClientHeaderDeneb struct {
-	Beacon          *BeaconBlockHeader           `json:"beacon"`
-	Execution       *ExecutionPayloadHeaderDeneb `json:"execution"`
-	ExecutionBranch []string                     `json:"execution_branch"`
-}
-
-type LightClientBootstrap struct {
-	Header                     json.RawMessage `json:"header"`
-	CurrentSyncCommittee       *SyncCommittee  `json:"current_sync_committee"`
-	CurrentSyncCommitteeBranch []string        `json:"current_sync_committee_branch"`
-}
-
-type LightClientUpdate struct {
-	AttestedHeader          json.RawMessage `json:"attested_header"`
-	NextSyncCommittee       *SyncCommittee  `json:"next_sync_committee,omitempty"`
-	FinalizedHeader         json.RawMessage `json:"finalized_header,omitempty"`
-	SyncAggregate           *SyncAggregate  `json:"sync_aggregate"`
-	NextSyncCommitteeBranch []string        `json:"next_sync_committee_branch,omitempty"`
-	FinalityBranch          []string        `json:"finality_branch,omitempty"`
-	SignatureSlot           string          `json:"signature_slot"`
-}
-
-type LightClientFinalityUpdate struct {
-	AttestedHeader  json.RawMessage `json:"attested_header"`
-	FinalizedHeader json.RawMessage `json:"finalized_header"`
-	FinalityBranch  []string        `json:"finality_branch"`
-	SyncAggregate   *SyncAggregate  `json:"sync_aggregate"`
-	SignatureSlot   string          `json:"signature_slot"`
-}
-
-type LightClientOptimisticUpdate struct {
-	AttestedHeader json.RawMessage `json:"attested_header"`
-	SyncAggregate  *SyncAggregate  `json:"sync_aggregate"`
-	SignatureSlot  string          `json:"signature_slot"`
-}
-
 type LightClientBootstrapResponse struct {
 	Version string                `json:"version"`
 	Data    *LightClientBootstrap `json:"data"`
 }

-type LightClientUpdateResponse struct {
+type LightClientBootstrap struct {
+	Header                     *BeaconBlockHeader `json:"header"`
+	CurrentSyncCommittee       *SyncCommittee     `json:"current_sync_committee"`
+	CurrentSyncCommitteeBranch []string           `json:"current_sync_committee_branch"`
+}
+
+type LightClientUpdate struct {
+	AttestedHeader          *BeaconBlockHeader `json:"attested_header"`
+	NextSyncCommittee       *SyncCommittee     `json:"next_sync_committee,omitempty"`
+	FinalizedHeader         *BeaconBlockHeader `json:"finalized_header,omitempty"`
+	SyncAggregate           *SyncAggregate     `json:"sync_aggregate"`
+	NextSyncCommitteeBranch []string           `json:"next_sync_committee_branch,omitempty"`
+	FinalityBranch          []string           `json:"finality_branch,omitempty"`
+	SignatureSlot           string             `json:"signature_slot"`
+}
+
+type LightClientUpdateWithVersion struct {
 	Version string             `json:"version"`
 	Data    *LightClientUpdate `json:"data"`
 }

-type LightClientFinalityUpdateResponse struct {
-	Version string                     `json:"version"`
-	Data    *LightClientFinalityUpdate `json:"data"`
-}
-
-type LightClientOptimisticUpdateResponse struct {
-	Version string                       `json:"version"`
-	Data    *LightClientOptimisticUpdate `json:"data"`
-}
-
 type LightClientUpdatesByRangeResponse struct {
-	Updates []*LightClientUpdateResponse `json:"updates"`
+	Updates []*LightClientUpdateWithVersion `json:"updates"`
 }
--- a/api/server/structs/endpoints_validator.go
+++ b/api/server/structs/endpoints_validator.go
@@ -15,7 +15,7 @@ type SubmitContributionAndProofsRequest struct {
 }

 type SubmitAggregateAndProofsRequest struct {
-	Data []json.RawMessage `json:"data"`
+	Data []*SignedAggregateAttestationAndProof `json:"data"`
 }

 type SubmitSyncCommitteeSubscriptionsRequest struct {
@@ -118,34 +118,3 @@ type GetValidatorPerformanceResponse struct {
 	MissingValidators             [][]byte `json:"missing_validators,omitempty"`
 	InactivityScores              []uint64 `json:"inactivity_scores,omitempty"`
 }
-
-type GetValidatorParticipationResponse struct {
-	Epoch         string                  `json:"epoch"`
-	Finalized     bool                    `json:"finalized"`
-	Participation *ValidatorParticipation `json:"participation"`
-}
-
-type ValidatorParticipation struct {
-	GlobalParticipationRate          string `json:"global_participation_rate" deprecated:"true"`
-	VotedEther                       string `json:"voted_ether" deprecated:"true"`
-	EligibleEther                    string `json:"eligible_ether" deprecated:"true"`
-	CurrentEpochActiveGwei           string `json:"current_epoch_active_gwei"`
-	CurrentEpochAttestingGwei        string `json:"current_epoch_attesting_gwei"`
-	CurrentEpochTargetAttestingGwei  string `json:"current_epoch_target_attesting_gwei"`
-	PreviousEpochActiveGwei          string `json:"previous_epoch_active_gwei"`
-	PreviousEpochAttestingGwei       string `json:"previous_epoch_attesting_gwei"`
-	PreviousEpochTargetAttestingGwei string `json:"previous_epoch_target_attesting_gwei"`
-	PreviousEpochHeadAttestingGwei   string `json:"previous_epoch_head_attesting_gwei"`
-}
-
-type ActiveSetChanges struct {
-	Epoch               string   `json:"epoch"`
-	ActivatedPublicKeys []string `json:"activated_public_keys"`
-	ActivatedIndices    []string `json:"activated_indices"`
-	ExitedPublicKeys    []string `json:"exited_public_keys"`
-	ExitedIndices       []string `json:"exited_indices"`
-	SlashedPublicKeys   []string `json:"slashed_public_keys"`
-	SlashedIndices      []string `json:"slashed_indices"`
-	EjectedPublicKeys   []string `json:"ejected_public_keys"`
-	EjectedIndices      []string `json:"ejected_indices"`
-}
--- a/api/server/structs/other.go
+++ b/api/server/structs/other.go
@@ -29,13 +29,6 @@ type Attestation struct {
 	Signature       string           `json:"signature"`
 }

-type AttestationElectra struct {
-	AggregationBits string           `json:"aggregation_bits"`
-	Data            *AttestationData `json:"data"`
-	Signature       string           `json:"signature"`
-	CommitteeBits   string           `json:"committee_bits"`
-}
-
 type AttestationData struct {
 	Slot            string      `json:"slot"`
 	CommitteeIndex  string      `json:"index"`
@@ -85,17 +78,6 @@ type AggregateAttestationAndProof struct {
 	SelectionProof  string       `json:"selection_proof"`
 }

-type SignedAggregateAttestationAndProofElectra struct {
-	Message   *AggregateAttestationAndProofElectra `json:"message"`
-	Signature string                               `json:"signature"`
-}
-
-type AggregateAttestationAndProofElectra struct {
-	AggregatorIndex string              `json:"aggregator_index"`
-	Aggregate       *AttestationElectra `json:"aggregate"`
-	SelectionProof  string              `json:"selection_proof"`
-}
-
 type SyncCommitteeSubscription struct {
 	ValidatorIndex       string   `json:"validator_index"`
 	SyncCommitteeIndices []string `json:"sync_committee_indices"`
@@ -196,11 +178,6 @@ type AttesterSlashing struct {
 	Attestation2 *IndexedAttestation `json:"attestation_2"`
 }

-type AttesterSlashingElectra struct {
-	Attestation1 *IndexedAttestationElectra `json:"attestation_1"`
-	Attestation2 *IndexedAttestationElectra `json:"attestation_2"`
-}
-
 type Deposit struct {
 	Proof []string     `json:"proof"`
 	Data  *DepositData `json:"data"`
@@ -219,12 +196,6 @@ type IndexedAttestation struct {
 	Signature        string           `json:"signature"`
 }

-type IndexedAttestationElectra struct {
-	AttestingIndices []string         `json:"attesting_indices"`
-	Data             *AttestationData `json:"data"`
-	Signature        string           `json:"signature"`
-}
-
 type SyncAggregate struct {
 	SyncCommitteeBits      string `json:"sync_committee_bits"`
 	SyncCommitteeSignature string `json:"sync_committee_signature"`
@@ -236,42 +207,3 @@ type Withdrawal struct {
 	ExecutionAddress string `json:"address"`
 	Amount           string `json:"amount"`
 }
-
-type DepositRequest struct {
-	Pubkey                string `json:"pubkey"`
-	WithdrawalCredentials string `json:"withdrawal_credentials"`
-	Amount                string `json:"amount"`
-	Signature             string `json:"signature"`
-	Index                 string `json:"index"`
-}
-
-type WithdrawalRequest struct {
-	SourceAddress   string `json:"source_address"`
-	ValidatorPubkey string `json:"validator_pubkey"`
-	Amount          string `json:"amount"`
-}
-
-type ConsolidationRequest struct {
-	SourceAddress string `json:"source_address"`
-	SourcePubkey  string `json:"source_pubkey"`
-	TargetPubkey  string `json:"target_pubkey"`
-}
-
-type PendingDeposit struct {
-	Pubkey                string `json:"pubkey"`
-	WithdrawalCredentials string `json:"withdrawal_credentials"`
-	Amount                string `json:"amount"`
-	Signature             string `json:"signature"`
-	Slot                  string `json:"slot"`
-}
-
-type PendingPartialWithdrawal struct {
-	Index             string `json:"index"`
-	Amount            string `json:"amount"`
-	WithdrawableEpoch string `json:"withdrawable_epoch"`
-}
-
-type PendingConsolidation struct {
-	SourceIndex string `json:"source_index"`
-	TargetIndex string `json:"target_index"`
-}
--- a/api/server/structs/state.go
+++ b/api/server/structs/state.go
@@ -140,43 +140,3 @@ type BeaconStateDeneb struct {
 	NextWithdrawalValidatorIndex string                       `json:"next_withdrawal_validator_index"`
 	HistoricalSummaries          []*HistoricalSummary         `json:"historical_summaries"`
 }
-
-type BeaconStateElectra struct {
-	GenesisTime                   string                         `json:"genesis_time"`
-	GenesisValidatorsRoot         string                         `json:"genesis_validators_root"`
-	Slot                          string                         `json:"slot"`
-	Fork                          *Fork                          `json:"fork"`
-	LatestBlockHeader             *BeaconBlockHeader             `json:"latest_block_header"`
-	BlockRoots                    []string                       `json:"block_roots"`
-	StateRoots                    []string                       `json:"state_roots"`
-	HistoricalRoots               []string                       `json:"historical_roots"`
-	Eth1Data                      *Eth1Data                      `json:"eth1_data"`
-	Eth1DataVotes                 []*Eth1Data                    `json:"eth1_data_votes"`
-	Eth1DepositIndex              string                         `json:"eth1_deposit_index"`
-	Validators                    []*Validator                   `json:"validators"`
-	Balances                      []string                       `json:"balances"`
-	RandaoMixes                   []string                       `json:"randao_mixes"`
-	Slashings                     []string                       `json:"slashings"`
-	PreviousEpochParticipation    []string                       `json:"previous_epoch_participation"`
-	CurrentEpochParticipation     []string                       `json:"current_epoch_participation"`
-	JustificationBits             string                         `json:"justification_bits"`
-	PreviousJustifiedCheckpoint   *Checkpoint                    `json:"previous_justified_checkpoint"`
-	CurrentJustifiedCheckpoint    *Checkpoint                    `json:"current_justified_checkpoint"`
-	FinalizedCheckpoint           *Checkpoint                    `json:"finalized_checkpoint"`
-	InactivityScores              []string                       `json:"inactivity_scores"`
-	CurrentSyncCommittee          *SyncCommittee                 `json:"current_sync_committee"`
-	NextSyncCommittee             *SyncCommittee                 `json:"next_sync_committee"`
-	LatestExecutionPayloadHeader  *ExecutionPayloadHeaderElectra `json:"latest_execution_payload_header"`
-	NextWithdrawalIndex           string                         `json:"next_withdrawal_index"`
-	NextWithdrawalValidatorIndex  string                         `json:"next_withdrawal_validator_index"`
-	HistoricalSummaries           []*HistoricalSummary           `json:"historical_summaries"`
-	DepositRequestsStartIndex     string                         `json:"deposit_requests_start_index"`
-	DepositBalanceToConsume       string                         `json:"deposit_balance_to_consume"`
-	ExitBalanceToConsume          string                         `json:"exit_balance_to_consume"`
-	EarliestExitEpoch             string                         `json:"earliest_exit_epoch"`
-	ConsolidationBalanceToConsume string                         `json:"consolidation_balance_to_consume"`
-	EarliestConsolidationEpoch    string                         `json:"earliest_consolidation_epoch"`
-	PendingDeposits               []*PendingDeposit              `json:"pending_deposits"`
-	PendingPartialWithdrawals     []*PendingPartialWithdrawal    `json:"pending_partial_withdrawals"`
-	PendingConsolidations         []*PendingConsolidation        `json:"pending_consolidations"`
-}
--- a/async/event/BUILD.bazel
+++ b/async/event/BUILD.bazel
@@ -4,25 +4,26 @@ go_library(
    name = "go_default_library",
    srcs = [
        "feed.go",
-        "interface.go",
        "subscription.go",
    ],
    importpath = "github.com/prysmaticlabs/prysm/v5/async/event",
    visibility = ["//visibility:public"],
-    deps = [
-        "//time/mclock:go_default_library",
-        "@com_github_ethereum_go_ethereum//event:go_default_library",
-    ],
+    deps = ["//time/mclock:go_default_library"],
 )

 go_test(
    name = "go_default_test",
    size = "small",
    srcs = [
+        "example_feed_test.go",
        "example_scope_test.go",
        "example_subscription_test.go",
+        "feed_test.go",
        "subscription_test.go",
    ],
    embed = [":go_default_library"],
-    deps = ["//testing/require:go_default_library"],
+    deps = [
+        "//testing/assert:go_default_library",
+        "//testing/require:go_default_library",
+    ],
 )
--- a/async/event/example_feed_test.go
+++ b/async/event/example_feed_test.go
@@ -0,0 +1,73 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package event_test
+
+import (
+	"fmt"
+
+	"github.com/prysmaticlabs/prysm/v5/async/event"
+)
+
+func ExampleFeed_acknowledgedEvents() {
+	// This example shows how the return value of Send can be used for request/reply
+	// interaction between event consumers and producers.
+	var feed event.Feed
+	type ackedEvent struct {
+		i   int
+		ack chan<- struct{}
+	}
+
+	// Consumers wait for events on the feed and acknowledge processing.
+	done := make(chan struct{})
+	defer close(done)
+	for i := 0; i < 3; i++ {
+		ch := make(chan ackedEvent, 100)
+		sub := feed.Subscribe(ch)
+		go func() {
+			defer sub.Unsubscribe()
+			for {
+				select {
+				case ev := <-ch:
+					fmt.Println(ev.i) // "process" the event
+					ev.ack <- struct{}{}
+				case <-done:
+					return
+				}
+			}
+		}()
+	}
+
+	// The producer sends values of type ackedEvent with increasing values of i.
+	// It waits for all consumers to acknowledge before sending the next event.
+	for i := 0; i < 3; i++ {
+		acksignal := make(chan struct{})
+		n := feed.Send(ackedEvent{i, acksignal})
+		for ack := 0; ack < n; ack++ {
+			<-acksignal
+		}
+	}
+	// Output:
+	// 0
+	// 0
+	// 0
+	// 1
+	// 1
+	// 1
+	// 2
+	// 2
+	// 2
+}
--- a/async/event/feed.go
+++ b/async/event/feed.go
@@ -14,12 +14,241 @@
 // You should have received a copy of the GNU Lesser General Public License
 // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

+// Package event contains an event feed implementation for process communication.
 package event

 import (
-	geth_event "github.com/ethereum/go-ethereum/event"
+	"errors"
+	"reflect"
+	"slices"
+	"sync"
 )

-// Feed is a re-export of the go-ethereum event feed.
-type Feed = geth_event.Feed
-type Subscription = geth_event.Subscription
+var errBadChannel = errors.New("event: Subscribe argument does not have sendable channel type")
+
+// Feed implements one-to-many subscriptions where the carrier of events is a channel.
+// Values sent to a Feed are delivered to all subscribed channels simultaneously.
+//
+// Feeds can only be used with a single type. The type is determined by the first Send or
+// Subscribe operation. Subsequent calls to these methods panic if the type does not
+// match.
+//
+// The zero value is ready to use.
+type Feed struct {
+	once      sync.Once        // ensures that init only runs once
+	sendLock  chan struct{}    // sendLock has a one-element buffer and is empty when held.It protects sendCases.
+	removeSub chan interface{} // interrupts Send
+	sendCases caseList         // the active set of select cases used by Send
+
+	// The inbox holds newly subscribed channels until they are added to sendCases.
+	mu    sync.Mutex
+	inbox caseList
+	etype reflect.Type
+}
+
+// This is the index of the first actual subscription channel in sendCases.
+// sendCases[0] is a SelectRecv case for the removeSub channel.
+const firstSubSendCase = 1
+
+type feedTypeError struct {
+	got, want reflect.Type
+	op        string
+}
+
+func (e feedTypeError) Error() string {
+	return "event: wrong type in " + e.op + " got " + e.got.String() + ", want " + e.want.String()
+}
+
+func (f *Feed) init() {
+	f.removeSub = make(chan interface{})
+	f.sendLock = make(chan struct{}, 1)
+	f.sendLock <- struct{}{}
+	f.sendCases = caseList{{Chan: reflect.ValueOf(f.removeSub), Dir: reflect.SelectRecv}}
+}
+
+// Subscribe adds a channel to the feed. Future sends will be delivered on the channel
+// until the subscription is canceled. All channels added must have the same element type.
+//
+// The channel should have ample buffer space to avoid blocking other subscribers.
+// Slow subscribers are not dropped.
+func (f *Feed) Subscribe(channel interface{}) Subscription {
+	f.once.Do(f.init)
+
+	chanval := reflect.ValueOf(channel)
+	chantyp := chanval.Type()
+	if chantyp.Kind() != reflect.Chan || chantyp.ChanDir()&reflect.SendDir == 0 {
+		panic(errBadChannel)
+	}
+	sub := &feedSub{feed: f, channel: chanval, err: make(chan error, 1)}
+
+	f.mu.Lock()
+	defer f.mu.Unlock()
+	if !f.typecheck(chantyp.Elem()) {
+		panic(feedTypeError{op: "Subscribe", got: chantyp, want: reflect.ChanOf(reflect.SendDir, f.etype)})
+	}
+	// Add the select case to the inbox.
+	// The next Send will add it to f.sendCases.
+	cas := reflect.SelectCase{Dir: reflect.SelectSend, Chan: chanval}
+	f.inbox = append(f.inbox, cas)
+	return sub
+}
+
+// note: callers must hold f.mu
+func (f *Feed) typecheck(typ reflect.Type) bool {
+	if f.etype == nil {
+		f.etype = typ
+		return true
+	}
+	// In the event the feed's type is an actual interface, we
+	// perform an interface conformance check here.
+	if f.etype.Kind() == reflect.Interface && typ.Implements(f.etype) {
+		return true
+	}
+	return f.etype == typ
+}
+
+func (f *Feed) remove(sub *feedSub) {
+	// Delete from inbox first, which covers channels
+	// that have not been added to f.sendCases yet.
+	ch := sub.channel.Interface()
+	f.mu.Lock()
+	index := f.inbox.find(ch)
+	if index != -1 {
+		f.inbox = f.inbox.delete(index)
+		f.mu.Unlock()
+		return
+	}
+	f.mu.Unlock()
+
+	select {
+	case f.removeSub <- ch:
+		// Send will remove the channel from f.sendCases.
+	case <-f.sendLock:
+		// No Send is in progress, delete the channel now that we have the send lock.
+		f.sendCases = f.sendCases.delete(f.sendCases.find(ch))
+		f.sendLock <- struct{}{}
+	}
+}
+
+// Send delivers to all subscribed channels simultaneously.
+// It returns the number of subscribers that the value was sent to.
+func (f *Feed) Send(value interface{}) (nsent int) {
+	rvalue := reflect.ValueOf(value)
+
+	f.once.Do(f.init)
+	<-f.sendLock
+
+	// Add new cases from the inbox after taking the send lock.
+	f.mu.Lock()
+	f.sendCases = append(f.sendCases, f.inbox...)
+	f.inbox = nil
+
+	if !f.typecheck(rvalue.Type()) {
+		f.sendLock <- struct{}{}
+		f.mu.Unlock()
+		panic(feedTypeError{op: "Send", got: rvalue.Type(), want: f.etype})
+	}
+	f.mu.Unlock()
+
+	// Set the sent value on all channels.
+	for i := firstSubSendCase; i < len(f.sendCases); i++ {
+		f.sendCases[i].Send = rvalue
+	}
+
+	// Send until all channels except removeSub have been chosen. 'cases' tracks a prefix
+	// of sendCases. When a send succeeds, the corresponding case moves to the end of
+	// 'cases' and it shrinks by one element.
+	cases := f.sendCases
+	for {
+		// Fast path: try sending without blocking before adding to the select set.
+		// This should usually succeed if subscribers are fast enough and have free
+		// buffer space.
+		for i := firstSubSendCase; i < len(cases); i++ {
+			if cases[i].Chan.TrySend(rvalue) {
+				nsent++
+				cases = cases.deactivate(i)
+				i--
+			}
+		}
+		if len(cases) == firstSubSendCase {
+			break
+		}
+		// Select on all the receivers, waiting for them to unblock.
+		chosen, recv, _ := reflect.Select(cases)
+		if chosen == 0 /* <-f.removeSub */ {
+			index := f.sendCases.find(recv.Interface())
+			f.sendCases = f.sendCases.delete(index)
+			if index >= 0 && index < len(cases) {
+				// Shrink 'cases' too because the removed case was still active.
+				cases = f.sendCases[:len(cases)-1]
+			}
+		} else {
+			cases = cases.deactivate(chosen)
+			nsent++
+		}
+	}
+
+	// Forget about the sent value and hand off the send lock.
+	for i := firstSubSendCase; i < len(f.sendCases); i++ {
+		f.sendCases[i].Send = reflect.Value{}
+	}
+	f.sendLock <- struct{}{}
+	return nsent
+}
+
+type feedSub struct {
+	feed    *Feed
+	channel reflect.Value
+	errOnce sync.Once
+	err     chan error
+}
+
+// Unsubscribe remove feed subscription.
+func (sub *feedSub) Unsubscribe() {
+	sub.errOnce.Do(func() {
+		sub.feed.remove(sub)
+		close(sub.err)
+	})
+}
+
+// Err returns error channel.
+func (sub *feedSub) Err() <-chan error {
+	return sub.err
+}
+
+type caseList []reflect.SelectCase
+
+// find returns the index of a case containing the given channel.
+func (cs caseList) find(channel interface{}) int {
+	return slices.IndexFunc(cs, func(selectCase reflect.SelectCase) bool {
+		return selectCase.Chan.Interface() == channel
+	})
+}
+
+// delete removes the given case from cs.
+func (cs caseList) delete(index int) caseList {
+	return append(cs[:index], cs[index+1:]...)
+}
+
+// deactivate moves the case at index into the non-accessible portion of the cs slice.
+func (cs caseList) deactivate(index int) caseList {
+	last := len(cs) - 1
+	cs[index], cs[last] = cs[last], cs[index]
+	return cs[:last]
+}
+
+// func (cs caseList) String() string {
+//     s := "["
+//     for i, cas := range cs {
+//             if i != 0 {
+//                     s += ", "
+//             }
+//             switch cas.Dir {
+//             case reflect.SelectSend:
+//                     s += fmt.Sprintf("%v<-", cas.Chan.Interface())
+//             case reflect.SelectRecv:
+//                     s += fmt.Sprintf("<-%v", cas.Chan.Interface())
+//             }
+//     }
+//     return s + "]"
+// }
--- a/async/event/feed_test.go
+++ b/async/event/feed_test.go
@@ -0,0 +1,509 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package event
+
+import (
+	"fmt"
+	"reflect"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/prysmaticlabs/prysm/v5/testing/assert"
+)
+
+func TestFeedPanics(t *testing.T) {
+	{
+		var f Feed
+		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
+		ch := make(chan int)
+		f.Subscribe(ch)
+		want := feedTypeError{op: "Send", got: reflect.TypeOf(uint64(0)), want: reflect.TypeOf(0)}
+		assert.NoError(t, checkPanic(want, func() { f.Send(uint64(2)) }))
+	}
+	{
+		var f Feed
+		f.Send(2)
+		want := feedTypeError{op: "Subscribe", got: reflect.TypeOf(make(chan uint64)), want: reflect.TypeOf(make(chan<- int))}
+		assert.NoError(t, checkPanic(want, func() { f.Subscribe(make(chan uint64)) }))
+	}
+	{
+		var f Feed
+		assert.NoError(t, checkPanic(errBadChannel, func() { f.Subscribe(make(<-chan int)) }))
+	}
+	{
+		var f Feed
+		assert.NoError(t, checkPanic(errBadChannel, func() { f.Subscribe(0) }))
+	}
+}
+
+func checkPanic(want error, fn func()) (err error) {
+	defer func() {
+		panicResult := recover()
+		if panicResult == nil {
+			err = fmt.Errorf("didn't panic")
+		} else if !reflect.DeepEqual(panicResult, want) {
+			err = fmt.Errorf("panicked with wrong error: got %q, want %q", panicResult, want)
+		}
+	}()
+	fn()
+	return nil
+}
+
+func TestFeed(t *testing.T) {
+	var feed Feed
+	var done, subscribed sync.WaitGroup
+	subscriber := func(i int) {
+		defer done.Done()
+
+		subchan := make(chan int)
+		sub := feed.Subscribe(subchan)
+		timeout := time.NewTimer(2 * time.Second)
+		subscribed.Done()
+
+		select {
+		case v := <-subchan:
+			if v != 1 {
+				t.Errorf("%d: received value %d, want 1", i, v)
+			}
+		case <-timeout.C:
+			t.Errorf("%d: receive timeout", i)
+		}
+
+		sub.Unsubscribe()
+		select {
+		case _, ok := <-sub.Err():
+			if ok {
+				t.Errorf("%d: error channel not closed after unsubscribe", i)
+			}
+		case <-timeout.C:
+			t.Errorf("%d: unsubscribe timeout", i)
+		}
+	}
+
+	const n = 1000
+	done.Add(n)
+	subscribed.Add(n)
+	for i := 0; i < n; i++ {
+		go subscriber(i)
+	}
+	subscribed.Wait()
+	if nsent := feed.Send(1); nsent != n {
+		t.Errorf("first send delivered %d times, want %d", nsent, n)
+	}
+	if nsent := feed.Send(2); nsent != 0 {
+		t.Errorf("second send delivered %d times, want 0", nsent)
+	}
+	done.Wait()
+}
+
+func TestFeedSubscribeSameChannel(t *testing.T) {
+	var (
+		feed Feed
+		done sync.WaitGroup
+		ch   = make(chan int)
+		sub1 = feed.Subscribe(ch)
+		sub2 = feed.Subscribe(ch)
+		_    = feed.Subscribe(ch)
+	)
+	expectSends := func(value, n int) {
+		if nsent := feed.Send(value); nsent != n {
+			t.Errorf("send delivered %d times, want %d", nsent, n)
+		}
+		done.Done()
+	}
+	expectRecv := func(wantValue, n int) {
+		for i := 0; i < n; i++ {
+			if v := <-ch; v != wantValue {
+				t.Errorf("received %d, want %d", v, wantValue)
+			}
+		}
+	}
+
+	done.Add(1)
+	go expectSends(1, 3)
+	expectRecv(1, 3)
+	done.Wait()
+
+	sub1.Unsubscribe()
+
+	done.Add(1)
+	go expectSends(2, 2)
+	expectRecv(2, 2)
+	done.Wait()
+
+	sub2.Unsubscribe()
+
+	done.Add(1)
+	go expectSends(3, 1)
+	expectRecv(3, 1)
+	done.Wait()
+}
+
+func TestFeedSubscribeBlockedPost(_ *testing.T) {
+	var (
+		feed   Feed
+		nsends = 2000
+		ch1    = make(chan int)
+		ch2    = make(chan int)
+		wg     sync.WaitGroup
+	)
+	defer wg.Wait()
+
+	feed.Subscribe(ch1)
+	wg.Add(nsends)
+	for i := 0; i < nsends; i++ {
+		go func() {
+			feed.Send(99)
+			wg.Done()
+		}()
+	}
+
+	sub2 := feed.Subscribe(ch2)
+	defer sub2.Unsubscribe()
+
+	// We're done when ch1 has received N times.
+	// The number of receives on ch2 depends on scheduling.
+	for i := 0; i < nsends; {
+		select {
+		case <-ch1:
+			i++
+		case <-ch2:
+		}
+	}
+}
+
+func TestFeedUnsubscribeBlockedPost(_ *testing.T) {
+	var (
+		feed   Feed
+		nsends = 200
+		chans  = make([]chan int, 2000)
+		subs   = make([]Subscription, len(chans))
+		bchan  = make(chan int)
+		bsub   = feed.Subscribe(bchan)
+		wg     sync.WaitGroup
+	)
+	for i := range chans {
+		chans[i] = make(chan int, nsends)
+	}
+
+	// Queue up some Sends. None of these can make progress while bchan isn't read.
+	wg.Add(nsends)
+	for i := 0; i < nsends; i++ {
+		go func() {
+			feed.Send(99)
+			wg.Done()
+		}()
+	}
+	// Subscribe the other channels.
+	for i, ch := range chans {
+		subs[i] = feed.Subscribe(ch)
+	}
+	// Unsubscribe them again.
+	for _, sub := range subs {
+		sub.Unsubscribe()
+	}
+	// Unblock the Sends.
+	bsub.Unsubscribe()
+	wg.Wait()
+}
+
+// Checks that unsubscribing a channel during Send works even if that
+// channel has already been sent on.
+func TestFeedUnsubscribeSentChan(_ *testing.T) {
+	var (
+		feed Feed
+		ch1  = make(chan int)
+		ch2  = make(chan int)
+		sub1 = feed.Subscribe(ch1)
+		sub2 = feed.Subscribe(ch2)
+		wg   sync.WaitGroup
+	)
+	defer sub2.Unsubscribe()
+
+	wg.Add(1)
+	go func() {
+		feed.Send(0)
+		wg.Done()
+	}()
+
+	// Wait for the value on ch1.
+	<-ch1
+	// Unsubscribe ch1, removing it from the send cases.
+	sub1.Unsubscribe()
+
+	// Receive ch2, finishing Send.
+	<-ch2
+	wg.Wait()
+
+	// Send again. This should send to ch2 only, so the wait group will unblock
+	// as soon as a value is received on ch2.
+	wg.Add(1)
+	go func() {
+		feed.Send(0)
+		wg.Done()
+	}()
+	<-ch2
+	wg.Wait()
+}
+
+func TestFeedUnsubscribeFromInbox(t *testing.T) {
+	var (
+		feed Feed
+		ch1  = make(chan int)
+		ch2  = make(chan int)
+		sub1 = feed.Subscribe(ch1)
+		sub2 = feed.Subscribe(ch1)
+		sub3 = feed.Subscribe(ch2)
+	)
+	assert.Equal(t, 3, len(feed.inbox))
+	assert.Equal(t, 1, len(feed.sendCases), "sendCases is non-empty after unsubscribe")
+
+	sub1.Unsubscribe()
+	sub2.Unsubscribe()
+	sub3.Unsubscribe()
+	assert.Equal(t, 0, len(feed.inbox), "Inbox is non-empty after unsubscribe")
+	assert.Equal(t, 1, len(feed.sendCases), "sendCases is non-empty after unsubscribe")
+}
+
+func BenchmarkFeedSend1000(b *testing.B) {
+	var (
+		done  sync.WaitGroup
+		feed  Feed
+		nsubs = 1000
+	)
+	subscriber := func(ch <-chan int) {
+		for i := 0; i < b.N; i++ {
+			<-ch
+		}
+		done.Done()
+	}
+	done.Add(nsubs)
+	for i := 0; i < nsubs; i++ {
+		ch := make(chan int, 200)
+		feed.Subscribe(ch)
+		go subscriber(ch)
+	}
+
+	// The actual benchmark.
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		if feed.Send(i) != nsubs {
+			panic("wrong number of sends")
+		}
+	}
+
+	b.StopTimer()
+	done.Wait()
+}
+
+func TestFeed_Send(t *testing.T) {
+	tests := []struct {
+		name        string
+		evFeed      *Feed
+		testSetup   func(fd *Feed, t *testing.T, o interface{})
+		obj         interface{}
+		expectPanic bool
+	}{
+		{
+			name:   "normal struct",
+			evFeed: new(Feed),
+			testSetup: func(fd *Feed, t *testing.T, o interface{}) {
+				testChan := make(chan testFeedWithPointer, 1)
+				fd.Subscribe(testChan)
+			},
+			obj: testFeedWithPointer{
+				a: new(uint64),
+				b: new(string),
+			},
+			expectPanic: false,
+		},
+		{
+			name:   "un-implemented interface",
+			evFeed: new(Feed),
+			testSetup: func(fd *Feed, t *testing.T, o interface{}) {
+				testChan := make(chan testFeedIface, 1)
+				fd.Subscribe(testChan)
+			},
+			obj: testFeedWithPointer{
+				a: new(uint64),
+				b: new(string),
+			},
+			expectPanic: true,
+		},
+		{
+			name:   "semi-implemented interface",
+			evFeed: new(Feed),
+			testSetup: func(fd *Feed, t *testing.T, o interface{}) {
+				testChan := make(chan testFeedIface, 1)
+				fd.Subscribe(testChan)
+			},
+			obj: testFeed2{
+				a: 0,
+				b: "",
+				c: []byte{'A'},
+			},
+			expectPanic: true,
+		},
+		{
+			name:   "fully-implemented interface",
+			evFeed: new(Feed),
+			testSetup: func(fd *Feed, t *testing.T, o interface{}) {
+				testChan := make(chan testFeedIface)
+				// Make it unbuffered to allow message to
+				// pass through
+				go func() {
+					a := <-testChan
+					if !reflect.DeepEqual(a, o) {
+						t.Errorf("Got = %v, want = %v", a, o)
+					}
+				}()
+				fd.Subscribe(testChan)
+			},
+			obj: testFeed{
+				a: 0,
+				b: "",
+			},
+			expectPanic: false,
+		},
+		{
+			name:   "fully-implemented interface with additional methods",
+			evFeed: new(Feed),
+			testSetup: func(fd *Feed, t *testing.T, o interface{}) {
+				testChan := make(chan testFeedIface)
+				// Make it unbuffered to allow message to
+				// pass through
+				go func() {
+					a := <-testChan
+					if !reflect.DeepEqual(a, o) {
+						t.Errorf("Got = %v, want = %v", a, o)
+					}
+				}()
+				fd.Subscribe(testChan)
+			},
+			obj: testFeed3{
+				a: 0,
+				b: "",
+				c: []byte{'A'},
+				d: []byte{'B'},
+			},
+			expectPanic: false,
+		},
+		{
+			name:   "concrete types implementing the same interface",
+			evFeed: new(Feed),
+			testSetup: func(fd *Feed, t *testing.T, o interface{}) {
+				testChan := make(chan testFeed, 1)
+				// Make it unbuffered to allow message to
+				// pass through
+				go func() {
+					a := <-testChan
+					if !reflect.DeepEqual(a, o) {
+						t.Errorf("Got = %v, want = %v", a, o)
+					}
+				}()
+				fd.Subscribe(testChan)
+			},
+			obj: testFeed3{
+				a: 0,
+				b: "",
+				c: []byte{'A'},
+				d: []byte{'B'},
+			},
+			expectPanic: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			defer func() {
+				if r := recover(); r != nil {
+					if !tt.expectPanic {
+						t.Errorf("panic triggered when unexpected: %v", r)
+					}
+				} else {
+					if tt.expectPanic {
+						t.Error("panic not triggered when expected")
+					}
+				}
+			}()
+			tt.testSetup(tt.evFeed, t, tt.obj)
+			if gotNsent := tt.evFeed.Send(tt.obj); gotNsent != 1 {
+				t.Errorf("Send() = %v, want %v", gotNsent, 1)
+			}
+		})
+	}
+}
+
+// The following objects below are a collection of different
+// struct types to test with.
+type testFeed struct {
+	a uint64
+	b string
+}
+
+func (testFeed) method1() {
+
+}
+
+func (testFeed) method2() {
+
+}
+
+type testFeedWithPointer struct {
+	a *uint64
+	b *string
+}
+
+type testFeed2 struct {
+	a uint64
+	b string
+	c []byte
+}
+
+func (testFeed2) method1() {
+
+}
+
+type testFeed3 struct {
+	a    uint64
+	b    string
+	c, d []byte
+}
+
+func (testFeed3) method1() {
+
+}
+
+func (testFeed3) method2() {
+
+}
+
+func (testFeed3) method3() {
+
+}
+
+type testFeedIface interface {
+	method1()
+	method2()
+}
--- a/async/event/interface.go
+++ b/async/event/interface.go
@@ -1,8 +0,0 @@
-package event
-
-// SubscriberSender is an abstract representation of an *event.Feed
-// to use in describing types that accept or return an *event.Feed.
-type SubscriberSender interface {
-	Subscribe(channel interface{}) Subscription
-	Send(value interface{}) (nsent int)
-}
--- a/async/event/subscription.go
+++ b/async/event/subscription.go
@@ -28,6 +28,25 @@ import (
 // request backoff time.
 const waitQuotient = 10

+// Subscription represents a stream of events. The carrier of the events is typically a
+// channel, but isn't part of the interface.
+//
+// Subscriptions can fail while established. Failures are reported through an error
+// channel. It receives a value if there is an issue with the subscription (e.g. the
+// network connection delivering the events has been closed). Only one value will ever be
+// sent.
+//
+// The error channel is closed when the subscription ends successfully (i.e. when the
+// source of events is closed). It is also closed when Unsubscribe is called.
+//
+// The Unsubscribe method cancels the sending of events. You must call Unsubscribe in all
+// cases to ensure that resources related to the subscription are released. It can be
+// called any number of times.
+type Subscription interface {
+	Err() <-chan error // returns the error channel
+	Unsubscribe()      // cancels sending of events, closing the error channel
+}
+
 // NewSubscription runs a producer function as a subscription in a new goroutine. The
 // channel given to the producer is closed when Unsubscribe is called. If fn returns an
 // error, it is sent on the subscription's error channel.
--- a/beacon-chain/blockchain/BUILD.bazel
+++ b/beacon-chain/blockchain/BUILD.bazel
@@ -6,15 +6,14 @@ go_library(
        "chain_info.go",
        "chain_info_forkchoice.go",
        "currently_syncing_block.go",
-        "currently_syncing_execution_payload_envelope.go",
        "defragment.go",
        "error.go",
        "execution_engine.go",
-        "execution_engine_epbs.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",
@@ -27,8 +26,7 @@ go_library(
        "receive_attestation.go",
        "receive_blob.go",
        "receive_block.go",
-        "receive_execution_payload_envelope.go",
-        "receive_payload_attestation_message.go",
+        "receive_sidecar.go",
        "service.go",
        "tracked_proposer.go",
        "weak_subjectivity_checks.go",
@@ -47,12 +45,10 @@ go_library(
        "//beacon-chain/cache:go_default_library",
        "//beacon-chain/core/altair:go_default_library",
        "//beacon-chain/core/blocks:go_default_library",
-        "//beacon-chain/core/epbs:go_default_library",
        "//beacon-chain/core/epoch/precompute:go_default_library",
        "//beacon-chain/core/feed:go_default_library",
        "//beacon-chain/core/feed/state:go_default_library",
        "//beacon-chain/core/helpers:go_default_library",
-        "//beacon-chain/core/light-client:go_default_library",
        "//beacon-chain/core/signing:go_default_library",
        "//beacon-chain/core/time:go_default_library",
        "//beacon-chain/core/transition:go_default_library",
@@ -86,10 +82,10 @@ go_library(
        "//encoding/bytesutil:go_default_library",
        "//math:go_default_library",
        "//monitoring/tracing:go_default_library",
-        "//monitoring/tracing/trace: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",
@@ -115,7 +111,6 @@ go_test(
        "chain_info_norace_test.go",
        "chain_info_test.go",
        "checktags_test.go",
-        "epbs_test.go",
        "error_test.go",
        "execution_engine_test.go",
        "forkchoice_update_execution_test.go",
@@ -123,6 +118,7 @@ go_test(
        "head_test.go",
        "init_sync_process_block_test.go",
        "init_test.go",
+        "lightclient_test.go",
        "log_test.go",
        "metrics_test.go",
        "mock_test.go",
@@ -131,7 +127,6 @@ go_test(
        "process_block_test.go",
        "receive_attestation_test.go",
        "receive_block_test.go",
-        "receive_execution_payload_envelope_test.go",
        "service_norace_test.go",
        "service_test.go",
        "setup_test.go",
@@ -180,12 +175,12 @@ go_test(
        "//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",
-        "//testing/util/random:go_default_library",
        "//time:go_default_library",
        "//time/slots:go_default_library",
        "@com_github_ethereum_go_ethereum//common:go_default_library",
--- a/beacon-chain/blockchain/chain_info.go
+++ b/beacon-chain/blockchain/chain_info.go
@@ -12,14 +12,13 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
 	fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
-	consensus_blocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/forkchoice"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
+	"go.opencensus.io/trace"
 )

 // ChainInfoFetcher defines a common interface for methods in blockchain service which
@@ -43,15 +42,14 @@ type ForkchoiceFetcher interface {
 	GetProposerHead() [32]byte
 	SetForkChoiceGenesisTime(uint64)
 	UpdateHead(context.Context, primitives.Slot)
-	HighestReceivedBlockSlotRoot() (primitives.Slot, [32]byte)
+	HighestReceivedBlockSlot() primitives.Slot
 	ReceivedBlocksLastEpoch() (uint64, error)
-	InsertNode(context.Context, state.BeaconState, consensus_blocks.ROBlock) error
+	InsertNode(context.Context, state.BeaconState, [32]byte) error
 	ForkChoiceDump(context.Context) (*forkchoice.Dump, error)
 	NewSlot(context.Context, primitives.Slot) error
 	ProposerBoost() [32]byte
 	RecentBlockSlot(root [32]byte) (primitives.Slot, error)
 	IsCanonical(ctx context.Context, blockRoot [32]byte) (bool, error)
-	GetPTCVote(root [32]byte) primitives.PTCStatus
 }

 // TimeFetcher retrieves the Ethereum consensus data that's related to time.
@@ -120,12 +118,6 @@ type OptimisticModeFetcher interface {
 	IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool, error)
 }

-// ExecutionPayloadFetcher defines a common interface that returns forkchoice
-// information about payload block hashes
-type ExecutionPayloadFetcher interface {
-	HashInForkchoice([32]byte) bool
-}
-
 // FinalizedCheckpt returns the latest finalized checkpoint from chain store.
 func (s *Service) FinalizedCheckpt() *ethpb.Checkpoint {
 	s.cfg.ForkChoiceStore.RLock()
@@ -211,7 +203,7 @@ func (s *Service) HeadState(ctx context.Context) (state.BeaconState, error) {
 	defer s.headLock.RUnlock()

 	ok := s.hasHeadState()
-	span.SetAttributes(trace.BoolAttribute("cache_hit", ok))
+	span.AddAttributes(trace.BoolAttribute("cache_hit", ok))

 	if ok {
 		return s.headState(ctx), nil
@@ -233,7 +225,7 @@ func (s *Service) HeadStateReadOnly(ctx context.Context) (state.ReadOnlyBeaconSt
 	defer s.headLock.RUnlock()

 	ok := s.hasHeadState()
-	span.SetAttributes(trace.BoolAttribute("cache_hit", ok))
+	span.AddAttributes(trace.BoolAttribute("cache_hit", ok))

 	if ok {
 		return s.headStateReadOnly(ctx), nil
@@ -250,7 +242,7 @@ func (s *Service) HeadValidatorsIndices(ctx context.Context, epoch primitives.Ep
 	if !s.hasHeadState() {
 		return []primitives.ValidatorIndex{}, nil
 	}
-	return helpers.ActiveValidatorIndices(ctx, s.headStateReadOnly(ctx), epoch)
+	return helpers.ActiveValidatorIndices(ctx, s.headState(ctx), epoch)
 }

 // HeadGenesisValidatorsRoot returns genesis validators root of the head state.
@@ -407,14 +399,6 @@ func (s *Service) InForkchoice(root [32]byte) bool {
 	return s.cfg.ForkChoiceStore.HasNode(root)
 }

-// HashInForkchoice returns true if the given payload block hash is found in
-// forkchoice
-func (s *Service) HashInForkchoice(hash [32]byte) bool {
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
-	return s.cfg.ForkChoiceStore.HasHash(hash)
-}
-
 // IsOptimisticForRoot takes the root as argument instead of the current head
 // and returns true if it is optimistic.
 func (s *Service) IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool, error) {
--- a/beacon-chain/blockchain/chain_info_forkchoice.go
+++ b/beacon-chain/blockchain/chain_info_forkchoice.go
@@ -4,9 +4,7 @@ import (
 	"context"

 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
-	consensus_blocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/forkchoice"
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 )

@@ -24,6 +22,13 @@ 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()
@@ -31,11 +36,11 @@ func (s *Service) SetForkChoiceGenesisTime(timestamp uint64) {
 	s.cfg.ForkChoiceStore.SetGenesisTime(timestamp)
 }

-// HighestReceivedBlockSlotRoot returns the corresponding value from forkchoice
-func (s *Service) HighestReceivedBlockSlotRoot() (primitives.Slot, [32]byte) {
+// HighestReceivedBlockSlot returns the corresponding value from forkchoice
+func (s *Service) HighestReceivedBlockSlot() primitives.Slot {
 	s.cfg.ForkChoiceStore.RLock()
 	defer s.cfg.ForkChoiceStore.RUnlock()
-	return s.cfg.ForkChoiceStore.HighestReceivedBlockSlotRoot()
+	return s.cfg.ForkChoiceStore.HighestReceivedBlockSlot()
 }

 // ReceivedBlocksLastEpoch returns the corresponding value from forkchoice
@@ -46,10 +51,10 @@ func (s *Service) ReceivedBlocksLastEpoch() (uint64, error) {
 }

 // InsertNode is a wrapper for node insertion which is self locked
-func (s *Service) InsertNode(ctx context.Context, st state.BeaconState, block consensus_blocks.ROBlock) error {
+func (s *Service) InsertNode(ctx context.Context, st state.BeaconState, root [32]byte) error {
 	s.cfg.ForkChoiceStore.Lock()
 	defer s.cfg.ForkChoiceStore.Unlock()
-	return s.cfg.ForkChoiceStore.InsertNode(ctx, st, block)
+	return s.cfg.ForkChoiceStore.InsertNode(ctx, st, root)
 }

 // ForkChoiceDump returns the corresponding value from forkchoice
@@ -94,37 +99,3 @@ func (s *Service) FinalizedBlockHash() [32]byte {
 	defer s.cfg.ForkChoiceStore.RUnlock()
 	return s.cfg.ForkChoiceStore.FinalizedPayloadBlockHash()
 }
-
-// ParentRoot wraps a call to the corresponding method in forkchoice
-func (s *Service) ParentRoot(root [32]byte) ([32]byte, error) {
-	s.cfg.ForkChoiceStore.RLock()
-	defer s.cfg.ForkChoiceStore.RUnlock()
-	return s.cfg.ForkChoiceStore.ParentRoot(root)
-}
-
-// GetPTCVote wraps a call to the corresponding method in forkchoice and checks
-// the currently syncing status
-// Warning: this method will return the current PTC status regardless of
-// timeliness. A client MUST call this method when about to submit a PTC
-// attestation, that is exactly at the threshold to submit the attestation.
-func (s *Service) GetPTCVote(root [32]byte) primitives.PTCStatus {
-	s.cfg.ForkChoiceStore.RLock()
-	f := s.cfg.ForkChoiceStore.GetPTCVote()
-	s.cfg.ForkChoiceStore.RUnlock()
-	if f != primitives.PAYLOAD_ABSENT {
-		return f
-	}
-	f, isSyncing := s.payloadBeingSynced.isSyncing(root)
-	if isSyncing {
-		return f
-	}
-	return primitives.PAYLOAD_ABSENT
-}
-
-// insertPayloadEnvelope wraps a locked call to the corresponding method in
-// forkchoice
-func (s *Service) insertPayloadEnvelope(envelope interfaces.ROExecutionPayloadEnvelope) error {
-	s.cfg.ForkChoiceStore.Lock()
-	defer s.cfg.ForkChoiceStore.Unlock()
-	return s.cfg.ForkChoiceStore.InsertPayloadEnvelope(envelope)
-}
--- a/beacon-chain/blockchain/chain_info_test.go
+++ b/beacon-chain/blockchain/chain_info_test.go
@@ -13,7 +13,6 @@ import (
 	fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
-	consensus_blocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	enginev1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
@@ -37,10 +36,9 @@ func prepareForkchoiceState(
 	blockRoot [32]byte,
 	parentRoot [32]byte,
 	payloadHash [32]byte,
-	parentHash [32]byte,
 	justified *ethpb.Checkpoint,
 	finalized *ethpb.Checkpoint,
-) (state.BeaconState, consensus_blocks.ROBlock, error) {
+) (state.BeaconState, [32]byte, error) {
 	blockHeader := &ethpb.BeaconBlockHeader{
 		ParentRoot: parentRoot[:],
 	}
@@ -61,27 +59,7 @@ func prepareForkchoiceState(

 	base.BlockRoots[0] = append(base.BlockRoots[0], blockRoot[:]...)
 	st, err := state_native.InitializeFromProtoBellatrix(base)
-	if err != nil {
-		return nil, consensus_blocks.ROBlock{}, err
-	}
-	blk := &ethpb.SignedBeaconBlockBellatrix{
-		Block: &ethpb.BeaconBlockBellatrix{
-			Slot:       slot,
-			ParentRoot: parentRoot[:],
-			Body: &ethpb.BeaconBlockBodyBellatrix{
-				ExecutionPayload: &enginev1.ExecutionPayload{
-					BlockHash:  payloadHash[:],
-					ParentHash: parentHash[:],
-				},
-			},
-		},
-	}
-	signed, err := blocks.NewSignedBeaconBlock(blk)
-	if err != nil {
-		return nil, consensus_blocks.ROBlock{}, err
-	}
-	roblock, err := consensus_blocks.NewROBlockWithRoot(signed, blockRoot)
-	return st, roblock, err
+	return st, blockRoot, err
 }

 func TestHeadRoot_Nil(t *testing.T) {
@@ -144,9 +122,9 @@ func TestUnrealizedJustifiedBlockHash(t *testing.T) {
 	service := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}}
 	ojc := &ethpb.Checkpoint{Root: []byte{'j'}}
 	ofc := &ethpb.Checkpoint{Root: []byte{'f'}}
-	st, roblock, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 	service.cfg.ForkChoiceStore.SetBalancesByRooter(func(_ context.Context, _ [32]byte) ([]uint64, error) { return []uint64{}, nil })
 	require.NoError(t, service.cfg.ForkChoiceStore.UpdateJustifiedCheckpoint(ctx, &forkchoicetypes.Checkpoint{Epoch: 6, Root: [32]byte{'j'}}))

@@ -338,24 +316,24 @@ func TestService_ChainHeads(t *testing.T) {
 	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}}
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	st, roblock, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
-	st, roblock, err = prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	st, blkRoot, err = prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
-	st, roblock, err = prepareForkchoiceState(ctx, 101, [32]byte{'b'}, [32]byte{'a'}, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	st, blkRoot, err = prepareForkchoiceState(ctx, 101, [32]byte{'b'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
-	st, roblock, err = prepareForkchoiceState(ctx, 102, [32]byte{'c'}, [32]byte{'b'}, [32]byte{'C'}, [32]byte{'B'}, ojc, ofc)
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	st, blkRoot, err = prepareForkchoiceState(ctx, 102, [32]byte{'c'}, [32]byte{'b'}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
-	st, roblock, err = prepareForkchoiceState(ctx, 103, [32]byte{'d'}, [32]byte{'a'}, [32]byte{'D'}, [32]byte{'C'}, ojc, ofc)
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	st, blkRoot, err = prepareForkchoiceState(ctx, 103, [32]byte{'d'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
-	st, roblock, err = prepareForkchoiceState(ctx, 104, [32]byte{'e'}, [32]byte{'b'}, [32]byte{'E'}, [32]byte{'D'}, ojc, ofc)
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	st, blkRoot, err = prepareForkchoiceState(ctx, 104, [32]byte{'e'}, [32]byte{'b'}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))

 	roots, slots := c.ChainHeads()
 	require.Equal(t, 3, len(roots))
@@ -435,12 +413,12 @@ func TestService_IsOptimistic(t *testing.T) {
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	c := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, head: &head{root: [32]byte{'b'}}}
-	st, roblock, err := prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	st, blkRoot, err := prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
-	st, roblock, err = prepareForkchoiceState(ctx, 101, [32]byte{'b'}, [32]byte{'a'}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	st, blkRoot, err = prepareForkchoiceState(ctx, 101, [32]byte{'b'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))

 	opt, err := c.IsOptimistic(ctx)
 	require.NoError(t, err)
@@ -471,12 +449,12 @@ func TestService_IsOptimisticForRoot(t *testing.T) {
 	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, roblock, err := prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
+	st, blkRoot, err := prepareForkchoiceState(ctx, 100, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
-	st, roblock, err = prepareForkchoiceState(ctx, 101, [32]byte{'b'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, [32]byte{'A'}, ojc, ofc)
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	st, blkRoot, err = prepareForkchoiceState(ctx, 101, [32]byte{'b'}, [32]byte{'a'}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
-	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
+	require.NoError(t, c.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))

 	opt, err := c.IsOptimisticForRoot(ctx, [32]byte{'a'})
 	require.NoError(t, err)
--- a/beacon-chain/blockchain/currently_syncing_execution_payload_envelope.go
+++ b/beacon-chain/blockchain/currently_syncing_execution_payload_envelope.go
@@ -1,36 +0,0 @@
-package blockchain
-
-import (
-	"sync"
-
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-)
-
-type currentlySyncingPayload struct {
-	sync.Mutex
-	roots map[[32]byte]primitives.PTCStatus
-}
-
-func (b *currentlySyncingPayload) set(envelope interfaces.ROExecutionPayloadEnvelope) {
-	b.Lock()
-	defer b.Unlock()
-	if envelope.PayloadWithheld() {
-		b.roots[envelope.BeaconBlockRoot()] = primitives.PAYLOAD_WITHHELD
-	} else {
-		b.roots[envelope.BeaconBlockRoot()] = primitives.PAYLOAD_PRESENT
-	}
-}
-
-func (b *currentlySyncingPayload) unset(root [32]byte) {
-	b.Lock()
-	defer b.Unlock()
-	delete(b.roots, root)
-}
-
-func (b *currentlySyncingPayload) isSyncing(root [32]byte) (status primitives.PTCStatus, isSyncing bool) {
-	b.Lock()
-	defer b.Unlock()
-	status, isSyncing = b.roots[root]
-	return
-}
--- a/beacon-chain/blockchain/epbs_test.go
+++ b/beacon-chain/blockchain/epbs_test.go
@@ -1,18 +0,0 @@
-package blockchain
-
-import (
-	"testing"
-
-	doublylinkedtree "github.com/prysmaticlabs/prysm/v5/beacon-chain/forkchoice/doubly-linked-tree"
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/testing/require"
-)
-
-func TestServiceGetPTCVote(t *testing.T) {
-	c := &currentlySyncingPayload{roots: make(map[[32]byte]primitives.PTCStatus)}
-	s := &Service{cfg: &config{ForkChoiceStore: doublylinkedtree.New()}, payloadBeingSynced: c}
-	r := [32]byte{'r'}
-	require.Equal(t, primitives.PAYLOAD_ABSENT, s.GetPTCVote(r))
-	c.roots[r] = primitives.PAYLOAD_WITHHELD
-	require.Equal(t, primitives.PAYLOAD_WITHHELD, s.GetPTCVote(r))
-}
--- a/beacon-chain/blockchain/error.go
+++ b/beacon-chain/blockchain/error.go
@@ -30,9 +30,6 @@ var (
 	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")
-	// errInvalidValidatorIndex is returned when a validator index is
-	// invalid or unexpected
-	errInvalidValidatorIndex = errors.New("invalid validator index")
 )

 var errMaxBlobsExceeded = errors.New("Expected commitments in block exceeds MAX_BLOBS_PER_BLOCK")
--- a/beacon-chain/blockchain/execution_engine.go
+++ b/beacon-chain/blockchain/execution_engine.go
@@ -21,11 +21,11 @@ import (
 	payloadattribute "github.com/prysmaticlabs/prysm/v5/consensus-types/payload-attribute"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	enginev1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
 	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
 	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 const blobCommitmentVersionKZG uint8 = 0x01
@@ -39,7 +39,7 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*
 	ctx, span := trace.StartSpan(ctx, "blockChain.notifyForkchoiceUpdate")
 	defer span.End()

-	if arg.headBlock == nil || arg.headBlock.IsNil() {
+	if arg.headBlock.IsNil() {
 		log.Error("Head block is nil")
 		return nil, nil
 	}
@@ -94,14 +94,6 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*
 				log.WithError(err).Error("Could not set head root to invalid")
 				return nil, nil
 			}
-			if len(invalidRoots) == 0 {
-				log.WithFields(logrus.Fields{
-					"slot":      headBlk.Slot(),
-					"blockRoot": fmt.Sprintf("%#x", bytesutil.Trunc(headRoot[:])),
-				}).Warn("invalid payload")
-				return nil, nil
-			}
-
 			if err := s.removeInvalidBlockAndState(ctx, invalidRoots); err != nil {
 				log.WithError(err).Error("Could not remove invalid block and state")
 				return nil, nil
@@ -116,7 +108,6 @@ func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *fcuConfig) (*
 				}).Warn("Pruned invalid blocks, could not update head root")
 				return nil, invalidBlock{error: ErrInvalidPayload, root: arg.headRoot, invalidAncestorRoots: invalidRoots}
 			}
-
 			b, err := s.getBlock(ctx, r)
 			if err != nil {
 				log.WithError(err).Error("Could not get head block")
@@ -228,25 +219,17 @@ func (s *Service) notifyNewPayload(ctx context.Context, preStateVersion int,
 	}

 	var lastValidHash []byte
-	var parentRoot *common.Hash
-	var versionedHashes []common.Hash
-	var requests *enginev1.ExecutionRequests
 	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")
 		}
-		prh := common.Hash(blk.Block().ParentRoot())
-		parentRoot = &prh
+		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*/)
 	}
-	if blk.Version() >= version.Electra {
-		requests, err = blk.Block().Body().ExecutionRequests()
-		if err != nil {
-			return false, errors.Wrap(err, "could not get execution requests")
-		}
-	}
-	lastValidHash, err = s.cfg.ExecutionEngineCaller.NewPayload(ctx, payload, versionedHashes, parentRoot, requests)
-
 	switch {
 	case err == nil:
 		newPayloadValidNodeCount.Inc()
@@ -332,7 +315,6 @@ func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState,
 	}

 	// Get timestamp.
-	log.WithFields(logrus.Fields{"slot": slot, "stateslot": st.Slot()}).Info("about to compute attributes")
 	t, err := slots.ToTime(uint64(s.genesisTime.Unix()), slot)
 	if err != nil {
 		log.WithError(err).Error("Could not get timestamp to get payload attribute")
@@ -341,7 +323,7 @@ func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState,

 	var attr payloadattribute.Attributer
 	switch st.Version() {
-	case version.Deneb, version.Electra, version.EPBS:
+	case version.Deneb, version.Electra:
 		withdrawals, _, err := st.ExpectedWithdrawals()
 		if err != nil {
 			log.WithError(err).Error("Could not get expected withdrawals to get payload attribute")
--- a/beacon-chain/blockchain/execution_engine_epbs.go
+++ b/beacon-chain/blockchain/execution_engine_epbs.go
@@ -1,68 +0,0 @@
-package blockchain
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/execution"
-	"github.com/prysmaticlabs/prysm/v5/config/features"
-	payloadattribute "github.com/prysmaticlabs/prysm/v5/consensus-types/payload-attribute"
-	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
-	enginev1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
-	"github.com/prysmaticlabs/prysm/v5/runtime/version"
-	"github.com/sirupsen/logrus"
-)
-
-// 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) notifyForkchoiceUpdateEPBS(ctx context.Context, blockhash [32]byte, attributes payloadattribute.Attributer) (*enginev1.PayloadIDBytes, error) {
-	ctx, span := trace.StartSpan(ctx, "blockChain.notifyForkchoiceUpdateEPBS")
-	defer span.End()
-
-	finalizedHash := s.cfg.ForkChoiceStore.FinalizedPayloadBlockHash()
-	justifiedHash := s.cfg.ForkChoiceStore.UnrealizedJustifiedPayloadBlockHash()
-	fcs := &enginev1.ForkchoiceState{
-		HeadBlockHash:      blockhash[:],
-		SafeBlockHash:      justifiedHash[:],
-		FinalizedBlockHash: finalizedHash[:],
-	}
-	if attributes == nil {
-		attributes = payloadattribute.EmptyWithVersion(version.EPBS)
-	}
-	log.WithFields(logrus.Fields{
-		"Version":   attributes.Version(),
-		"Timestamp": attributes.Timestamp(),
-		"blockHash": fmt.Sprintf("%#x", blockhash),
-	}).Info("calling FCU V3 with attributes")
-
-	payloadID, lastValidHash, err := s.cfg.ExecutionEngineCaller.ForkchoiceUpdated(ctx, fcs, attributes)
-	if err != nil {
-		switch {
-		case errors.Is(err, execution.ErrAcceptedSyncingPayloadStatus):
-			forkchoiceUpdatedOptimisticNodeCount.Inc()
-			log.WithFields(logrus.Fields{
-				"headPayloadBlockHash":      fmt.Sprintf("%#x", bytesutil.Trunc(blockhash[:])),
-				"finalizedPayloadBlockHash": fmt.Sprintf("%#x", bytesutil.Trunc(finalizedHash[:])),
-			}).Info("Called fork choice updated with optimistic block")
-			return payloadID, nil
-		case errors.Is(err, execution.ErrInvalidPayloadStatus):
-			log.WithError(err).Info("forkchoice updated to invalid block")
-			return nil, invalidBlock{error: ErrInvalidPayload, root: [32]byte(lastValidHash)}
-		default:
-			log.WithError(err).Error(ErrUndefinedExecutionEngineError)
-			return nil, nil
-		}
-	}
-	forkchoiceUpdatedValidNodeCount.Inc()
-	// If the forkchoice update call has an attribute, update the payload ID cache.
-	hasAttr := attributes != nil && !attributes.IsEmpty()
-	if hasAttr && payloadID == nil && !features.Get().PrepareAllPayloads {
-		log.WithFields(logrus.Fields{
-			"blockHash": fmt.Sprintf("%#x", blockhash),
-		}).Error("Received nil payload ID on VALID engine response")
-	}
-	return payloadID, nil
-}
--- a/beacon-chain/blockchain/execution_engine_test.go
+++ b/beacon-chain/blockchain/execution_engine_test.go
@@ -46,13 +46,13 @@ func Test_NotifyForkchoiceUpdate_GetPayloadAttrErrorCanContinue(t *testing.T) {

 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))

@@ -104,13 +104,13 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {

 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))

@@ -287,16 +287,16 @@ func Test_NotifyForkchoiceUpdate_NIlLVH(t *testing.T) {
 	require.NoError(t, fcs.UpdateJustifiedCheckpoint(ctx, &forkchoicetypes.Checkpoint{}))
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, [32]byte{'B'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, [32]byte{'C'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))

@@ -316,8 +316,10 @@ func Test_NotifyForkchoiceUpdate_NIlLVH(t *testing.T) {
 		headRoot:  brd,
 	}
 	_, err = service.notifyForkchoiceUpdate(ctx, a)
-	// The incoming block is not invalid because the empty node is still valid on ePBS.
-	require.Equal(t, false, IsInvalidBlock(err))
+	require.Equal(t, true, IsInvalidBlock(err))
+	require.Equal(t, brd, InvalidBlockRoot(err))
+	require.Equal(t, brd, InvalidAncestorRoots(err)[0])
+	require.Equal(t, 1, len(InvalidAncestorRoots(err)))
 }

 //
@@ -396,28 +398,28 @@ func Test_NotifyForkchoiceUpdateRecursive_DoublyLinkedTree(t *testing.T) {
 	require.NoError(t, fcs.UpdateJustifiedCheckpoint(ctx, &forkchoicetypes.Checkpoint{}))
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 1, bra, [32]byte{}, [32]byte{'A'}, ojc, ofc)
 	require.NoError(t, err)

 	bState, _ := util.DeterministicGenesisState(t, 10)
 	require.NoError(t, beaconDB.SaveState(ctx, bState, bra))
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, [32]byte{'A'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, brb, bra, [32]byte{'B'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, [32]byte{'B'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 3, brc, brb, [32]byte{'C'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, [32]byte{'C'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 4, brd, brc, [32]byte{'D'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 5, bre, brb, [32]byte{'E'}, [32]byte{'D'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 5, bre, brb, [32]byte{'E'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 6, brf, bre, [32]byte{'F'}, [32]byte{'E'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 6, brf, bre, [32]byte{'F'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 7, brg, bre, [32]byte{'G'}, [32]byte{'F'}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 7, brg, bre, [32]byte{'G'}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))

@@ -510,10 +512,10 @@ func Test_NotifyNewPayload(t *testing.T) {
 	require.NoError(t, err)
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 1, r, [32]byte{}, [32]byte{'A'}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, r, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))

@@ -690,7 +692,7 @@ func Test_NotifyNewPayload(t *testing.T) {
 			}
 			service.cfg.ExecutionEngineCaller = e
 			root := [32]byte{'a'}
-			state, blkRoot, err := prepareForkchoiceState(ctx, 0, root, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+			state, blkRoot, err := prepareForkchoiceState(ctx, 0, root, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 			require.NoError(t, err)
 			require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 			postVersion, postHeader, err := getStateVersionAndPayload(tt.postState)
@@ -757,17 +759,17 @@ func Test_reportInvalidBlock(t *testing.T) {
 	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'}, [32]byte{}, jcp, jcp)
+	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'}, [32]byte{'a'}, jcp, jcp)
+	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'}, [32]byte{'b'}, jcp, jcp)
+	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'}, [32]byte{'c'}, jcp, jcp)
+	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))

@@ -929,7 +931,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	fjc := &forkchoicetypes.Checkpoint{Epoch: 0, Root: params.BeaconConfig().ZeroHash}
 	require.NoError(t, fcs.UpdateJustifiedCheckpoint(ctx, fjc))
 	require.NoError(t, fcs.UpdateFinalizedCheckpoint(fjc))
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, genesisRoot, params.BeaconConfig().ZeroHash, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, genesisRoot, params.BeaconConfig().ZeroHash, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 	fcs.SetOriginRoot(genesisRoot)
@@ -963,7 +965,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	require.NoError(t, beaconDB.SaveStateSummary(ctx, opStateSummary))
 	tenjc := &ethpb.Checkpoint{Epoch: 10, Root: genesisRoot[:]}
 	tenfc := &ethpb.Checkpoint{Epoch: 10, Root: genesisRoot[:]}
-	state, blkRoot, err = prepareForkchoiceState(ctx, 320, opRoot, genesisRoot, params.BeaconConfig().ZeroHash, [32]byte{}, tenjc, tenfc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 320, opRoot, genesisRoot, params.BeaconConfig().ZeroHash, tenjc, tenfc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
 	assert.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, opRoot))
@@ -992,7 +994,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	require.NoError(t, beaconDB.SaveStateSummary(ctx, validSummary))
 	twentyjc := &ethpb.Checkpoint{Epoch: 20, Root: validRoot[:]}
 	twentyfc := &ethpb.Checkpoint{Epoch: 20, Root: validRoot[:]}
-	state, blkRoot, err = prepareForkchoiceState(ctx, 640, validRoot, genesisRoot, params.BeaconConfig().ZeroHash, [32]byte{}, twentyjc, twentyfc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 640, validRoot, genesisRoot, params.BeaconConfig().ZeroHash, twentyjc, twentyfc)
 	require.NoError(t, err)
 	fcs.SetBalancesByRooter(func(_ context.Context, _ [32]byte) ([]uint64, error) { return []uint64{}, nil })
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
@@ -1054,8 +1056,8 @@ func TestService_removeInvalidBlockAndState(t *testing.T) {

 	require.NoError(t, service.removeInvalidBlockAndState(ctx, [][32]byte{r1, r2}))

-	require.Equal(t, false, service.chainHasBlock(ctx, r1))
-	require.Equal(t, false, service.chainHasBlock(ctx, r2))
+	require.Equal(t, false, service.hasBlock(ctx, r1))
+	require.Equal(t, false, service.hasBlock(ctx, r2))
 	require.Equal(t, false, service.cfg.BeaconDB.HasStateSummary(ctx, r1))
 	require.Equal(t, false, service.cfg.BeaconDB.HasStateSummary(ctx, r2))
 	has, err := service.cfg.StateGen.HasState(ctx, r1)
@@ -1133,14 +1135,9 @@ func TestComputePayloadAttribute(t *testing.T) {
 	// Cache hit, advance state, no fee recipient
 	slot := primitives.Slot(1)
 	service.cfg.PayloadIDCache.Set(slot, [32]byte{}, [8]byte{})
-	blk := util.NewBeaconBlockBellatrix()
-	signed, err := consensusblocks.NewSignedBeaconBlock(blk)
-	require.NoError(t, err)
-	roblock, err := consensusblocks.NewROBlockWithRoot(signed, [32]byte{'a'})
-	require.NoError(t, err)
 	cfg := &postBlockProcessConfig{
-		ctx:     ctx,
-		roblock: roblock,
+		ctx:       ctx,
+		blockRoot: [32]byte{'a'},
 	}
 	fcu := &fcuConfig{
 		headState:     st,
--- a/beacon-chain/blockchain/forkchoice_update_execution.go
+++ b/beacon-chain/blockchain/forkchoice_update_execution.go
@@ -12,9 +12,9 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	payloadattribute "github.com/prysmaticlabs/prysm/v5/consensus-types/payload-attribute"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
 	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 func (s *Service) isNewHead(r [32]byte) bool {
--- a/beacon-chain/blockchain/forkchoice_update_execution_test.go
+++ b/beacon-chain/blockchain/forkchoice_update_execution_test.go
@@ -122,13 +122,13 @@ func TestService_forkchoiceUpdateWithExecution_SameHeadRootNewProposer(t *testin

 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 1, altairBlkRoot, [32]byte{}, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))
-	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, 2, bellatrixBlkRoot, altairBlkRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, state, blkRoot))

@@ -164,10 +164,10 @@ func TestShouldOverrideFCU(t *testing.T) {
 	headRoot := [32]byte{'b'}
 	parentRoot := [32]byte{'a'}
 	ojc := &ethpb.Checkpoint{}
-	st, root, err := prepareForkchoiceState(ctx, 1, parentRoot, [32]byte{}, [32]byte{}, [32]byte{}, ojc, ojc)
+	st, root, err := prepareForkchoiceState(ctx, 1, parentRoot, [32]byte{}, [32]byte{}, ojc, ojc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, root))
-	st, root, err = prepareForkchoiceState(ctx, 2, headRoot, parentRoot, [32]byte{}, [32]byte{}, ojc, ojc)
+	st, root, err = prepareForkchoiceState(ctx, 2, headRoot, parentRoot, [32]byte{}, ojc, ojc)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, root))

--- a/beacon-chain/blockchain/head.go
+++ b/beacon-chain/blockchain/head.go
@@ -18,11 +18,11 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v5/math"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpbv1 "github.com/prysmaticlabs/prysm/v5/proto/eth/v1"
 	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
 	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 // UpdateAndSaveHeadWithBalances updates the beacon state head after getting justified balanced from cache.
--- a/beacon-chain/blockchain/head_test.go
+++ b/beacon-chain/blockchain/head_test.go
@@ -48,7 +48,7 @@ func TestSaveHead_Different(t *testing.T) {
 	require.NoError(t, err)
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	service.head = &head{
@@ -63,11 +63,11 @@ func TestSaveHead_Different(t *testing.T) {
 	wsb := util.SaveBlock(t, context.Background(), service.cfg.BeaconDB, newHeadSignedBlock)
 	newRoot, err := newHeadBlock.HashTreeRoot()
 	require.NoError(t, err)
-	state, blkRoot, err = prepareForkchoiceState(ctx, slots.PrevSlot(wsb.Block().Slot()), wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, slots.PrevSlot(wsb.Block().Slot()), wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))

-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	headState, err := util.NewBeaconState()
@@ -101,7 +101,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	require.NoError(t, err)
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, oldBlock.Block().Slot(), oldRoot, oldBlock.Block().ParentRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	service.head = &head{
@@ -110,7 +110,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	}

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

@@ -122,7 +122,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	wsb := util.SaveBlock(t, context.Background(), service.cfg.BeaconDB, newHeadSignedBlock)
 	newRoot, err := newHeadBlock.HashTreeRoot()
 	require.NoError(t, err)
-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	headState, err := util.NewBeaconState()
@@ -238,11 +238,11 @@ func TestRetrieveHead_ReadOnly(t *testing.T) {
 	wsb := util.SaveBlock(t, context.Background(), service.cfg.BeaconDB, newHeadSignedBlock)
 	newRoot, err := newHeadBlock.HashTreeRoot()
 	require.NoError(t, err)
-	state, blkRoot, err := prepareForkchoiceState(ctx, slots.PrevSlot(wsb.Block().Slot()), wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, slots.PrevSlot(wsb.Block().Slot()), wsb.Block().ParentRoot(), service.cfg.ForkChoiceStore.CachedHeadRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))

-	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, [32]byte{}, ojc, ofc)
+	state, blkRoot, err = prepareForkchoiceState(ctx, wsb.Block().Slot(), newRoot, wsb.Block().ParentRoot(), [32]byte{}, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	headState, err := util.NewBeaconState()
@@ -304,7 +304,7 @@ func TestSaveOrphanedAtts(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk3, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -381,7 +381,7 @@ func TestSaveOrphanedOps(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk3, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -451,7 +451,7 @@ func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlockCapella{blkG, blk1, blk2, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -509,7 +509,7 @@ func TestSaveOrphanedAtts_DoublyLinkedTrie(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk3, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -568,7 +568,7 @@ func TestSaveOrphanedAtts_CanFilter_DoublyLinkedTrie(t *testing.T) {
 	for _, blk := range []*ethpb.SignedBeaconBlock{blkG, blk1, blk2, blk4} {
 		r, err := blk.Block.HashTreeRoot()
 		require.NoError(t, err)
-		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r, bytesutil.ToBytes32(blk.Block.ParentRoot), [32]byte{}, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		util.SaveBlock(t, ctx, beaconDB, blk)
@@ -583,7 +583,7 @@ func TestUpdateHead_noSavedChanges(t *testing.T) {
 	ctx, beaconDB, fcs := tr.ctx, tr.db, tr.fcs

 	ojp := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, [32]byte{}, [32]byte{}, ojp, ojp)
+	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, [32]byte{}, ojp, ojp)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, blkRoot))

@@ -603,7 +603,7 @@ func TestUpdateHead_noSavedChanges(t *testing.T) {
 	headRoot := service.headRoot()
 	require.Equal(t, [32]byte{}, headRoot)

-	st, blkRoot, err = prepareForkchoiceState(ctx, 0, bellatrixBlkRoot, [32]byte{}, [32]byte{}, [32]byte{}, fcp, fcp)
+	st, blkRoot, err = prepareForkchoiceState(ctx, 0, bellatrixBlkRoot, [32]byte{}, [32]byte{}, fcp, fcp)
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertNode(ctx, st, blkRoot))
 	fcs.SetBalancesByRooter(func(context.Context, [32]byte) ([]uint64, error) { return []uint64{1, 2}, nil })
--- a/beacon-chain/blockchain/lightclient.go
+++ b/beacon-chain/blockchain/lightclient.go
@@ -0,0 +1,245 @@
+package blockchain
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+
+	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/v5/config/params"
+	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
+	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
+	ethpbv1 "github.com/prysmaticlabs/prysm/v5/proto/eth/v1"
+	ethpbv2 "github.com/prysmaticlabs/prysm/v5/proto/eth/v2"
+	"github.com/prysmaticlabs/prysm/v5/proto/migration"
+	"github.com/prysmaticlabs/prysm/v5/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 %w", 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 %w", err)
+	}
+	header.StateRoot = stateRoot[:]
+
+	headerRoot, err := header.HashTreeRoot()
+	if err != nil {
+		return nil, fmt.Errorf("could not get header root %w", err)
+	}
+
+	blockRoot, err := block.Block().HashTreeRoot()
+	if err != nil {
+		return nil, fmt.Errorf("could not get block root %w", 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 %w", 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 %w", 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 %w", err)
+			}
+			finalizedHeader = migration.V1Alpha1SignedHeaderToV1(tempFinalizedHeader).GetMessage()
+
+			finalizedHeaderRoot, err := finalizedHeader.HashTreeRoot()
+			if err != nil {
+				return nil, fmt.Errorf("could not get finalized header root %w", 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 %w", 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
@@ -0,0 +1,160 @@
+package blockchain
+
+import (
+	"context"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
+	"github.com/prysmaticlabs/prysm/v5/config/params"
+	"github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
+	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
+	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
+	v1 "github.com/prysmaticlabs/prysm/v5/proto/eth/v1"
+	ethpbv2 "github.com/prysmaticlabs/prysm/v5/proto/eth/v2"
+	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/v5/testing/require"
+	"github.com/prysmaticlabs/prysm/v5/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
@@ -45,44 +45,28 @@ func logStateTransitionData(b interfaces.ReadOnlyBeaconBlock) error {
 		}
 		log = log.WithField("syncBitsCount", agg.SyncCommitteeBits.Count())
 	}
-	if b.Version() >= version.EPBS {
-		sh, err := b.Body().SignedExecutionPayloadHeader()
+	if b.Version() >= version.Bellatrix {
+		p, err := b.Body().Execution()
 		if err != nil {
 			return err
 		}
-		header, err := sh.Header()
-		if err != nil {
+		log = log.WithField("payloadHash", fmt.Sprintf("%#x", bytesutil.Trunc(p.BlockHash())))
+		txs, err := p.Transactions()
+		switch {
+		case errors.Is(err, consensus_types.ErrUnsupportedField):
+		case err != nil:
 			return err
+		default:
+			log = log.WithField("txCount", len(txs))
+			txsPerSlotCount.Set(float64(len(txs)))
 		}
-		log = log.WithFields(logrus.Fields{"payloadHash": fmt.Sprintf("%#x", header.BlockHash()),
-			"builderIndex":           header.BuilderIndex(),
-			"value":                  header.Value(),
-			"blobKzgCommitmentsRoot": fmt.Sprintf("%#x", header.BlobKzgCommitmentsRoot()),
-		})
-	} else {
-		if b.Version() >= version.Bellatrix {
-			p, err := b.Body().Execution()
-			if err != nil {
-				return err
-			}
-			log = log.WithField("payloadHash", fmt.Sprintf("%#x", bytesutil.Trunc(p.BlockHash())))
-			txs, err := p.Transactions()
-			switch {
-			case errors.Is(err, consensus_types.ErrUnsupportedField):
-			case err != nil:
-				return err
-			default:
-				log = log.WithField("txCount", len(txs))
-				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))
-			}
+	}
+	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")
@@ -128,9 +112,6 @@ func logBlockSyncStatus(block interfaces.ReadOnlyBeaconBlock, blockRoot [32]byte

 // logs payload related data every slot.
 func logPayload(block interfaces.ReadOnlyBeaconBlock) error {
-	if block.Version() >= version.EPBS {
-		return nil
-	}
 	isExecutionBlk, err := blocks.IsExecutionBlock(block.Body())
 	if err != nil {
 		return errors.Wrap(err, "could not determine if block is execution block")
--- a/beacon-chain/blockchain/metrics.go
+++ b/beacon-chain/blockchain/metrics.go
@@ -182,10 +182,6 @@ var (
 		Name: "chain_service_processing_milliseconds",
 		Help: "Total time to call a chain service in ReceiveBlock()",
 	})
-	executionEngineProcessingTime = promauto.NewSummary(prometheus.SummaryOpts{
-		Name: "execution_engine_processing_milliseconds",
-		Help: "Total time to process an execution payload envelope in ReceiveExecutionPayloadEnvelope()",
-	})
 	dataAvailWaitedTime = promauto.NewSummary(prometheus.SummaryOpts{
 		Name: "da_waited_time_milliseconds",
 		Help: "Total time spent waiting for a data availability check in ReceiveBlock()",
--- a/beacon-chain/blockchain/options.go
+++ b/beacon-chain/blockchain/options.go
@@ -1,8 +1,6 @@
 package blockchain

 import (
-	"sync"
-
 	"github.com/prysmaticlabs/prysm/v5/async/event"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/cache"
 	statefeed "github.com/prysmaticlabs/prysm/v5/beacon-chain/core/feed/state"
@@ -71,22 +69,6 @@ func WithDepositCache(c cache.DepositCache) Option {
 	}
 }

-// WithPayloadAttestationCache for payload attestation cache.
-func WithPayloadAttestationCache(c *cache.PayloadAttestationCache) Option {
-	return func(s *Service) error {
-		s.cfg.PayloadAttestationCache = c
-		return nil
-	}
-}
-
-// WithPayloadEnvelopeCache for payload envelope cache.
-func WithPayloadEnvelopeCache(c *sync.Map) Option {
-	return func(s *Service) error {
-		s.cfg.PayloadEnvelopeCache = c
-		return nil
-	}
-}
-
 // WithPayloadIDCache for payload ID cache.
 func WithPayloadIDCache(c *cache.PayloadIDCache) Option {
 	return func(s *Service) error {
--- a/beacon-chain/blockchain/pow_block.go
+++ b/beacon-chain/blockchain/pow_block.go
@@ -46,7 +46,7 @@ func (s *Service) validateMergeBlock(ctx context.Context, b interfaces.ReadOnlyS
 	if err != nil {
 		return err
 	}
-	if payload == nil || payload.IsNil() {
+	if payload.IsNil() {
 		return errors.New("nil execution payload")
 	}
 	ok, err := canUseValidatedTerminalBlockHash(b.Block().Slot(), payload)
--- a/beacon-chain/blockchain/process_attestation.go
+++ b/beacon-chain/blockchain/process_attestation.go
@@ -7,10 +7,10 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1/attestation"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
+	"go.opencensus.io/trace"
 )

 // OnAttestation is called whenever an attestation is received, verifies the attestation is valid and saves
@@ -97,7 +97,7 @@ func (s *Service) OnAttestation(ctx context.Context, a ethpb.Att, disparity time
 	// We assume trusted attestation in this function has verified signature.

 	// Update forkchoice store with the new attestation for updating weight.
-	s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indexedAtt.GetAttestingIndices(), bytesutil.ToBytes32(a.GetData().BeaconBlockRoot), a.GetData().Slot)
+	s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indexedAtt.GetAttestingIndices(), bytesutil.ToBytes32(a.GetData().BeaconBlockRoot), a.GetData().Target.Epoch)

 	return nil
 }
--- a/beacon-chain/blockchain/process_attestation_test.go
+++ b/beacon-chain/blockchain/process_attestation_test.go
@@ -32,18 +32,18 @@ func TestStore_OnAttestation_ErrorConditions(t *testing.T) {
 	util.SaveBlock(t, ctx, beaconDB, blkWithoutState)

 	cp := &ethpb.Checkpoint{}
-	st, roblock, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, cp, cp)
+	st, blkRoot, err := prepareForkchoiceState(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, cp, cp)
 	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))

 	blkWithStateBadAtt := util.NewBeaconBlock()
 	blkWithStateBadAtt.Block.Slot = 1
 	r, err := blkWithStateBadAtt.Block.HashTreeRoot()
 	require.NoError(t, err)
 	cp = &ethpb.Checkpoint{Root: r[:]}
-	st, roblock, err = prepareForkchoiceState(ctx, blkWithStateBadAtt.Block.Slot, r, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, cp, cp)
+	st, blkRoot, err = prepareForkchoiceState(ctx, blkWithStateBadAtt.Block.Slot, r, [32]byte{}, params.BeaconConfig().ZeroHash, cp, cp)
 	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 	util.SaveBlock(t, ctx, beaconDB, blkWithStateBadAtt)
 	BlkWithStateBadAttRoot, err := blkWithStateBadAtt.Block.HashTreeRoot()
 	require.NoError(t, err)
@@ -139,9 +139,9 @@ func TestStore_OnAttestation_Ok_DoublyLinkedTree(t *testing.T) {
 		require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, copied, tRoot))
 		ojc := &ethpb.Checkpoint{Epoch: 0, Root: tRoot[:]}
 		ofc := &ethpb.Checkpoint{Epoch: 0, Root: tRoot[:]}
-		state, roblock, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+		state, blkRoot, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
 		require.NoError(t, err)
-		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, roblock))
+		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 		require.NoError(t, service.OnAttestation(ctx, att[0], 0))
 	}

@@ -170,7 +170,7 @@ func TestService_GetRecentPreState(t *testing.T) {
 	err = s.SetFinalizedCheckpoint(cp0)
 	require.NoError(t, err)

-	st, root, err := prepareForkchoiceState(ctx, 31, [32]byte(ckRoot), [32]byte{}, [32]byte{'R'}, [32]byte{}, cp0, cp0)
+	st, root, err := prepareForkchoiceState(ctx, 31, [32]byte(ckRoot), [32]byte{}, [32]byte{'R'}, cp0, cp0)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
 	service.head = &head{
@@ -202,7 +202,7 @@ func TestService_GetAttPreState_Concurrency(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'A'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: ckRoot}))

-	st, root, err := prepareForkchoiceState(ctx, 100, [32]byte(cp1.Root), [32]byte{}, [32]byte{'R'}, [32]byte{}, cp1, cp1)
+	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))

@@ -259,7 +259,7 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'A'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: bytesutil.PadTo([]byte{'A'}, fieldparams.RootLength)}))

-	st, root, err := prepareForkchoiceState(ctx, 1, [32]byte(cp1.Root), [32]byte{}, [32]byte{'R'}, [32]byte{}, cp1, cp1)
+	st, root, err := prepareForkchoiceState(ctx, 1, [32]byte(cp1.Root), [32]byte{}, [32]byte{'R'}, cp1, cp1)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))
 	s1, err := service.getAttPreState(ctx, cp1)
@@ -273,7 +273,7 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	_, 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'}, [32]byte{}, cp2, cp2)
+	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))

@@ -298,7 +298,7 @@ func TestStore_SaveCheckpointState(t *testing.T) {
 	cp3 := &ethpb.Checkpoint{Epoch: 1, Root: bytesutil.PadTo([]byte{'C'}, fieldparams.RootLength)}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, s, bytesutil.ToBytes32([]byte{'C'})))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Root: bytesutil.PadTo([]byte{'C'}, fieldparams.RootLength)}))
-	st, root, err = prepareForkchoiceState(ctx, 31, [32]byte(cp3.Root), [32]byte(cp2.Root), [32]byte{'P'}, [32]byte{}, cp2, cp2)
+	st, root, err = prepareForkchoiceState(ctx, 31, [32]byte(cp3.Root), [32]byte(cp2.Root), [32]byte{'P'}, cp2, cp2)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, root))

@@ -318,9 +318,10 @@ func TestStore_UpdateCheckpointState(t *testing.T) {
 	require.NoError(t, err)
 	checkpoint := &ethpb.Checkpoint{Epoch: epoch, Root: r1[:]}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(checkpoint.Root)))
-	st, roblock, err := prepareForkchoiceState(ctx, blk.Block.Slot, r1, [32]byte{}, params.BeaconConfig().ZeroHash, [32]byte{}, checkpoint, checkpoint)
+	st, blkRoot, err := prepareForkchoiceState(ctx, blk.Block.Slot, r1, [32]byte{}, params.BeaconConfig().ZeroHash, checkpoint, checkpoint)
 	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, r1))
 	returned, err := service.getAttPreState(ctx, checkpoint)
 	require.NoError(t, err)
 	assert.Equal(t, params.BeaconConfig().SlotsPerEpoch.Mul(uint64(checkpoint.Epoch)), returned.Slot(), "Incorrectly returned base state")
@@ -336,9 +337,10 @@ func TestStore_UpdateCheckpointState(t *testing.T) {
 	require.NoError(t, err)
 	newCheckpoint := &ethpb.Checkpoint{Epoch: epoch, Root: r2[:]}
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, baseState, bytesutil.ToBytes32(newCheckpoint.Root)))
-	st, roblock, err = prepareForkchoiceState(ctx, blk.Block.Slot, r2, r1, params.BeaconConfig().ZeroHash, [32]byte{}, newCheckpoint, newCheckpoint)
+	st, blkRoot, err = prepareForkchoiceState(ctx, blk.Block.Slot, r2, r1, params.BeaconConfig().ZeroHash, newCheckpoint, newCheckpoint)
 	require.NoError(t, err)
-	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, roblock))
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, r2))
 	returned, err = service.getAttPreState(ctx, newCheckpoint)
 	require.NoError(t, err)
 	s, err := slots.EpochStart(newCheckpoint.Epoch)
--- a/beacon-chain/blockchain/process_block.go
+++ b/beacon-chain/blockchain/process_block.go
@@ -25,12 +25,12 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/crypto/bls"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1/attestation"
 	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
 	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 // A custom slot deadline for processing state slots in our cache.
@@ -46,7 +46,8 @@ var initialSyncBlockCacheSize = uint64(2 * params.BeaconConfig().SlotsPerEpoch)
 // process the beacon block after validating the state transition function
 type postBlockProcessConfig struct {
 	ctx            context.Context
-	roblock        consensusblocks.ROBlock
+	signed         interfaces.ReadOnlySignedBeaconBlock
+	blockRoot      [32]byte
 	headRoot       [32]byte
 	postState      state.BeaconState
 	isValidPayload bool
@@ -60,34 +61,31 @@ func (s *Service) postBlockProcess(cfg *postBlockProcessConfig) error {
 	ctx, span := trace.StartSpan(cfg.ctx, "blockChain.onBlock")
 	defer span.End()
 	cfg.ctx = ctx
-	if err := consensusblocks.BeaconBlockIsNil(cfg.roblock); err != nil {
+	if err := consensusblocks.BeaconBlockIsNil(cfg.signed); err != nil {
 		return invalidBlock{error: err}
 	}
 	startTime := time.Now()
 	fcuArgs := &fcuConfig{}

 	if s.inRegularSync() {
-		if cfg.roblock.Version() < version.EPBS {
-			defer s.handleSecondFCUCall(cfg, fcuArgs)
-		}
+		defer s.handleSecondFCUCall(cfg, fcuArgs)
 	}
 	defer s.sendLightClientFeeds(cfg)
 	defer s.sendStateFeedOnBlock(cfg)
 	defer reportProcessingTime(startTime)
-	defer reportAttestationInclusion(cfg.roblock.Block())
+	defer reportAttestationInclusion(cfg.signed.Block())

-	err := s.cfg.ForkChoiceStore.InsertNode(ctx, cfg.postState, cfg.roblock)
+	err := s.cfg.ForkChoiceStore.InsertNode(ctx, cfg.postState, cfg.blockRoot)
 	if err != nil {
-		s.rollbackBlock(ctx, cfg.roblock.Root())
-		return errors.Wrapf(err, "could not insert block %d to fork choice store", cfg.roblock.Block().Slot())
+		return errors.Wrapf(err, "could not insert block %d to fork choice store", cfg.signed.Block().Slot())
 	}
-	if err := s.handleBlockAttestations(ctx, cfg.roblock.Block(), cfg.postState); err != nil {
+	if err := s.handleBlockAttestations(ctx, cfg.signed.Block(), cfg.postState); err != nil {
 		return errors.Wrap(err, "could not handle block's attestations")
 	}

-	s.InsertSlashingsToForkChoiceStore(ctx, cfg.roblock.Block().Body().AttesterSlashings())
+	s.InsertSlashingsToForkChoiceStore(ctx, cfg.signed.Block().Body().AttesterSlashings())
 	if cfg.isValidPayload {
-		if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, cfg.roblock.Root()); err != nil {
+		if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, cfg.blockRoot); err != nil {
 			return errors.Wrap(err, "could not set optimistic block to valid")
 		}
 	}
@@ -97,22 +95,10 @@ func (s *Service) postBlockProcess(cfg *postBlockProcessConfig) error {
 		log.WithError(err).Warn("Could not update head")
 	}
 	newBlockHeadElapsedTime.Observe(float64(time.Since(start).Milliseconds()))
-	if cfg.headRoot != cfg.roblock.Root() {
-		s.logNonCanonicalBlockReceived(cfg.roblock.Root(), cfg.headRoot)
+	if cfg.headRoot != cfg.blockRoot {
+		s.logNonCanonicalBlockReceived(cfg.blockRoot, cfg.headRoot)
 		return nil
 	}
-	if cfg.roblock.Version() >= version.EPBS {
-		if err := s.saveHead(ctx, cfg.headRoot, cfg.roblock, cfg.postState); err != nil {
-			log.WithError(err).Error("could not save head")
-		}
-		if err := s.pruneAttsFromPool(cfg.roblock); err != nil {
-			log.WithError(err).Error("could not prune attestations from pool")
-		}
-
-		// update the NSC and handle epoch boundaries here since we do
-		// not send FCU at all
-		return s.updateCachesPostBlockProcessing(cfg)
-	}
 	if err := s.getFCUArgs(cfg, fcuArgs); err != nil {
 		log.WithError(err).Error("Could not get forkchoice update argument")
 		return nil
@@ -156,7 +142,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 	b := blks[0].Block()

 	// Retrieve incoming block's pre state.
-	if err := s.verifyBlkPreState(ctx, b.ParentRoot()); err != nil {
+	if err := s.verifyBlkPreState(ctx, b); err != nil {
 		return err
 	}
 	preState, err := s.cfg.StateGen.StateByRootInitialSync(ctx, b.ParentRoot())
@@ -168,7 +154,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 	}

 	// Fill in missing blocks
-	if err := s.fillInForkChoiceMissingBlocks(ctx, blks[0], preState.CurrentJustifiedCheckpoint(), preState.FinalizedCheckpoint()); err != nil {
+	if err := s.fillInForkChoiceMissingBlocks(ctx, blks[0].Block(), preState.CurrentJustifiedCheckpoint(), preState.FinalizedCheckpoint()); err != nil {
 		return errors.Wrap(err, "could not fill in missing blocks to forkchoice")
 	}

@@ -248,7 +234,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 		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,
+		args := &forkchoicetypes.BlockAndCheckpoints{Block: b.Block(),
 			JustifiedCheckpoint: jCheckpoints[i],
 			FinalizedCheckpoint: fCheckpoints[i]}
 		pendingNodes[len(blks)-i-1] = args
@@ -293,7 +279,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []consensusblocks.ROBlo
 		return errors.Wrap(err, "could not insert batch to forkchoice")
 	}
 	// Insert the last block to forkchoice
-	if err := s.cfg.ForkChoiceStore.InsertNode(ctx, preState, lastB); err != nil {
+	if err := s.cfg.ForkChoiceStore.InsertNode(ctx, preState, lastBR); err != nil {
 		return errors.Wrap(err, "could not insert last block in batch to forkchoice")
 	}
 	// Set their optimistic status
@@ -389,7 +375,7 @@ func (s *Service) handleBlockAttestations(ctx context.Context, blk interfaces.Re
 		}
 		r := bytesutil.ToBytes32(a.GetData().BeaconBlockRoot)
 		if s.cfg.ForkChoiceStore.HasNode(r) {
-			s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indices, r, a.GetData().Slot)
+			s.cfg.ForkChoiceStore.ProcessAttestation(ctx, indices, r, a.GetData().Target.Epoch)
 		} else if err := s.cfg.AttPool.SaveBlockAttestation(a); err != nil {
 			return err
 		}
@@ -418,10 +404,6 @@ func (s *Service) savePostStateInfo(ctx context.Context, r [32]byte, b interface
 		return errors.Wrapf(err, "could not save block from slot %d", b.Block().Slot())
 	}
 	if err := s.cfg.StateGen.SaveState(ctx, r, st); err != nil {
-		log.Warnf("Rolling back insertion of block with root %#x", r)
-		if err := s.cfg.BeaconDB.DeleteBlock(ctx, r); err != nil {
-			log.WithError(err).Errorf("Could not delete block with block root %#x", r)
-		}
 		return errors.Wrap(err, "could not save state")
 	}
 	return nil
@@ -492,15 +474,9 @@ func (s *Service) runLateBlockTasks() {

 	attThreshold := params.BeaconConfig().SecondsPerSlot / 3
 	ticker := slots.NewSlotTickerWithOffset(s.genesisTime, time.Duration(attThreshold)*time.Second, params.BeaconConfig().SecondsPerSlot)
-	epbs := params.BeaconConfig().EPBSForkEpoch
 	for {
 		select {
-		case slot := <-ticker.C():
-			if slots.ToEpoch(slot) == epbs && slot%32 == 0 {
-				ticker.Done()
-				attThreshold := params.BeaconConfig().SecondsPerSlot / 4
-				ticker = slots.NewSlotTickerWithOffset(s.genesisTime, time.Duration(attThreshold)*time.Second, params.BeaconConfig().SecondsPerSlot)
-			}
+		case <-ticker.C():
 			s.lateBlockTasks(s.ctx)
 		case <-s.ctx.Done():
 			log.Debug("Context closed, exiting routine")
@@ -671,36 +647,24 @@ func (s *Service) lateBlockTasks(ctx context.Context) {
 		return
 	}

-	if headState.Version() >= version.EPBS {
-		bh, err := headState.LatestBlockHash()
-		if err != nil {
-			log.WithError(err).Debug("could not perform late block tasks: failed to retrieve latest block hash")
-			return
-		}
-		_, err = s.notifyForkchoiceUpdateEPBS(ctx, [32]byte(bh), attribute)
-		if err != nil {
-			log.WithError(err).Debug("could not perform late block tasks: failed to update forkchoice with engine")
-		}
-	} else {
-		s.headLock.RLock()
-		headBlock, err := s.headBlock()
-		if err != nil {
-			s.headLock.RUnlock()
-			log.WithError(err).Debug("could not perform late block tasks: failed to retrieve head block")
-			return
-		}
+	s.headLock.RLock()
+	headBlock, err := s.headBlock()
+	if err != nil {
 		s.headLock.RUnlock()
+		log.WithError(err).Debug("could not perform late block tasks: failed to retrieve head block")
+		return
+	}
+	s.headLock.RUnlock()

-		fcuArgs := &fcuConfig{
-			headState:  headState,
-			headRoot:   headRoot,
-			headBlock:  headBlock,
-			attributes: attribute,
-		}
-		_, err = s.notifyForkchoiceUpdate(ctx, fcuArgs)
-		if err != nil {
-			log.WithError(err).Debug("could not perform late block tasks: failed to update forkchoice with engine")
-		}
+	fcuArgs := &fcuConfig{
+		headState:  headState,
+		headRoot:   headRoot,
+		headBlock:  headBlock,
+		attributes: attribute,
+	}
+	_, err = s.notifyForkchoiceUpdate(ctx, fcuArgs)
+	if err != nil {
+		log.WithError(err).Debug("could not perform late block tasks: failed to update forkchoice with engine")
 	}
 }

@@ -720,15 +684,3 @@ func (s *Service) handleInvalidExecutionError(ctx context.Context, err error, bl
 	}
 	return err
 }
-
-// In the event of an issue processing a block we rollback changes done to the db and our caches
-// to always ensure that the node's internal state is consistent.
-func (s *Service) rollbackBlock(ctx context.Context, blockRoot [32]byte) {
-	log.Warnf("Rolling back insertion of block with root %#x due to processing error", blockRoot)
-	if err := s.cfg.StateGen.DeleteStateFromCaches(ctx, blockRoot); err != nil {
-		log.WithError(err).Errorf("Could not delete state from caches with block root %#x", blockRoot)
-	}
-	if err := s.cfg.BeaconDB.DeleteBlock(ctx, blockRoot); err != nil {
-		log.WithError(err).Errorf("Could not delete block with block root %#x", blockRoot)
-	}
-}
--- a/beacon-chain/blockchain/process_block_helpers.go
+++ b/beacon-chain/blockchain/process_block_helpers.go
@@ -5,9 +5,6 @@ import (
 	"fmt"
 	"time"

-	lightclient "github.com/prysmaticlabs/prysm/v5/beacon-chain/core/light-client"
-	"github.com/prysmaticlabs/prysm/v5/runtime/version"
-
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/feed"
@@ -17,18 +14,16 @@ import (
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v5/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v5/config/features"
-	field_params "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
-	consensus_blocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	mathutil "github.com/prysmaticlabs/prysm/v5/math"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpbv2 "github.com/prysmaticlabs/prysm/v5/proto/eth/v2"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
 	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 // CurrentSlot returns the current slot based on time.
@@ -44,7 +39,7 @@ func (s *Service) getFCUArgs(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) er
 	if !s.inRegularSync() {
 		return nil
 	}
-	slot := cfg.roblock.Block().Slot()
+	slot := cfg.signed.Block().Slot()
 	if slots.WithinVotingWindow(uint64(s.genesisTime.Unix()), slot) {
 		return nil
 	}
@@ -52,9 +47,9 @@ func (s *Service) getFCUArgs(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) er
 }

 func (s *Service) getFCUArgsEarlyBlock(cfg *postBlockProcessConfig, fcuArgs *fcuConfig) error {
-	if cfg.roblock.Root() == cfg.headRoot {
+	if cfg.blockRoot == cfg.headRoot {
 		fcuArgs.headState = cfg.postState
-		fcuArgs.headBlock = cfg.roblock
+		fcuArgs.headBlock = cfg.signed
 		fcuArgs.headRoot = cfg.headRoot
 		fcuArgs.proposingSlot = s.CurrentSlot() + 1
 		return nil
@@ -98,7 +93,7 @@ func (s *Service) fcuArgsNonCanonicalBlock(cfg *postBlockProcessConfig, fcuArgs

 // sendStateFeedOnBlock sends an event that a new block has been synced
 func (s *Service) sendStateFeedOnBlock(cfg *postBlockProcessConfig) {
-	optimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(cfg.roblock.Root())
+	optimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(cfg.blockRoot)
 	if err != nil {
 		log.WithError(err).Debug("Could not check if block is optimistic")
 		optimistic = true
@@ -107,9 +102,9 @@ func (s *Service) sendStateFeedOnBlock(cfg *postBlockProcessConfig) {
 	s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
 		Type: statefeed.BlockProcessed,
 		Data: &statefeed.BlockProcessedData{
-			Slot:        cfg.roblock.Block().Slot(),
-			BlockRoot:   cfg.roblock.Root(),
-			SignedBlock: cfg.roblock,
+			Slot:        cfg.signed.Block().Slot(),
+			BlockRoot:   cfg.blockRoot,
+			SignedBlock: cfg.signed,
 			Verified:    true,
 			Optimistic:  optimistic,
 		},
@@ -119,7 +114,7 @@ func (s *Service) sendStateFeedOnBlock(cfg *postBlockProcessConfig) {
 // 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.roblock, cfg.postState); err != nil {
+		if _, err := s.sendLightClientOptimisticUpdate(cfg.ctx, cfg.signed, cfg.postState); err != nil {
 			log.WithError(err).Error("Failed to send light client optimistic update")
 		}

@@ -127,7 +122,7 @@ func (s *Service) sendLightClientFeeds(cfg *postBlockProcessConfig) {
 		finalized := s.ForkChoicer().FinalizedCheckpoint()

 		// LightClientFinalityUpdate needs super majority
-		s.tryPublishLightClientFinalityUpdate(cfg.ctx, cfg.roblock, finalized, cfg.postState)
+		s.tryPublishLightClientFinalityUpdate(cfg.ctx, cfg.signed, finalized, cfg.postState)
 	}
 }

@@ -164,10 +159,6 @@ func (s *Service) sendLightClientFinalityUpdate(ctx context.Context, signed inte
 	postState state.BeaconState) (int, error) {
 	// Get attested state
 	attestedRoot := signed.Block().ParentRoot()
-	attestedBlock, err := s.cfg.BeaconDB.Block(ctx, attestedRoot)
-	if err != nil {
-		return 0, errors.Wrap(err, "could not get attested block")
-	}
 	attestedState, err := s.cfg.StateGen.StateByRoot(ctx, attestedRoot)
 	if err != nil {
 		return 0, errors.Wrap(err, "could not get attested state")
@@ -184,12 +175,11 @@ func (s *Service) sendLightClientFinalityUpdate(ctx context.Context, signed inte
 		}
 	}

-	update, err := lightclient.NewLightClientFinalityUpdateFromBeaconState(
+	update, err := NewLightClientFinalityUpdateFromBeaconState(
 		ctx,
 		postState,
 		signed,
 		attestedState,
-		attestedBlock,
 		finalizedBlock,
 	)

@@ -200,7 +190,7 @@ func (s *Service) sendLightClientFinalityUpdate(ctx context.Context, signed inte
 	// Return the result
 	result := &ethpbv2.LightClientFinalityUpdateWithVersion{
 		Version: ethpbv2.Version(signed.Version()),
-		Data:    update,
+		Data:    CreateLightClientFinalityUpdate(update),
 	}

 	// Send event
@@ -215,21 +205,16 @@ func (s *Service) sendLightClientOptimisticUpdate(ctx context.Context, signed in
 	postState state.BeaconState) (int, error) {
 	// Get attested state
 	attestedRoot := signed.Block().ParentRoot()
-	attestedBlock, err := s.cfg.BeaconDB.Block(ctx, attestedRoot)
-	if err != nil {
-		return 0, errors.Wrap(err, "could not get attested block")
-	}
 	attestedState, err := s.cfg.StateGen.StateByRoot(ctx, attestedRoot)
 	if err != nil {
 		return 0, errors.Wrap(err, "could not get attested state")
 	}

-	update, err := lightclient.NewLightClientOptimisticUpdateFromBeaconState(
+	update, err := NewLightClientOptimisticUpdateFromBeaconState(
 		ctx,
 		postState,
 		signed,
 		attestedState,
-		attestedBlock,
 	)

 	if err != nil {
@@ -239,7 +224,7 @@ func (s *Service) sendLightClientOptimisticUpdate(ctx context.Context, signed in
 	// Return the result
 	result := &ethpbv2.LightClientOptimisticUpdateWithVersion{
 		Version: ethpbv2.Version(signed.Version()),
-		Data:    update,
+		Data:    CreateLightClientOptimisticUpdate(update),
 	}

 	return s.cfg.StateNotifier.StateFeed().Send(&feed.Event{
@@ -254,21 +239,20 @@ func (s *Service) sendLightClientOptimisticUpdate(ctx context.Context, signed in
 // before sending FCU to the engine.
 func (s *Service) updateCachesPostBlockProcessing(cfg *postBlockProcessConfig) error {
 	slot := cfg.postState.Slot()
-	root := cfg.roblock.Root()
-	if err := transition.UpdateNextSlotCache(cfg.ctx, root[:], cfg.postState); err != nil {
+	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, root[:])
+	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.roblock.Root() {
+	if (fcuArgs.attributes == nil || fcuArgs.attributes.IsEmpty()) && cfg.headRoot == cfg.blockRoot {
 		go s.sendFCUWithAttributes(cfg, fcuArgs)
 	}
 }
@@ -284,7 +268,7 @@ func reportProcessingTime(startTime time.Time) {
 // 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.roblock.Root() == cfg.headRoot {
+	if cfg.blockRoot == cfg.headRoot {
 		if err := s.updateCachesPostBlockProcessing(cfg); err != nil {
 			return err
 		}
@@ -301,36 +285,11 @@ func (s *Service) getBlockPreState(ctx context.Context, b interfaces.ReadOnlyBea
 	defer span.End()

 	// Verify incoming block has a valid pre state.
-	if err := s.verifyBlkPreState(ctx, b.ParentRoot()); err != nil {
+	if err := s.verifyBlkPreState(ctx, b); err != nil {
 		return nil, err
 	}

-	parentRoot := b.ParentRoot()
-	s.ForkChoicer().RLock()
-	parentSlot, err := s.ForkChoicer().Slot(parentRoot)
-	if err != nil {
-		return nil, err
-	}
-	parentIsEPBS := slots.ToEpoch(parentSlot) >= params.BeaconConfig().EPBSForkEpoch
-	s.ForkChoicer().RUnlock()
-	if parentIsEPBS && b.Version() >= version.EPBS {
-		s.ForkChoicer().RLock()
-		parentHash := s.ForkChoicer().HashForBlockRoot(parentRoot)
-		s.ForkChoicer().RUnlock()
-		signedBid, err := b.Body().SignedExecutionPayloadHeader()
-		if err != nil {
-			return nil, errors.Wrap(err, "could not get signed execution payload header")
-		}
-		bid, err := signedBid.Header()
-		if err != nil {
-			return nil, errors.Wrap(err, "could not get execution payload header")
-		}
-		if parentHash == bid.ParentBlockHash() {
-			// It's based on full, use the state by hash
-			parentRoot = parentHash
-		}
-	}
-	preState, err := s.cfg.StateGen.StateByRoot(ctx, parentRoot)
+	preState, err := s.cfg.StateGen.StateByRoot(ctx, b.ParentRoot())
 	if err != nil {
 		return nil, errors.Wrapf(err, "could not get pre state for slot %d", b.Slot())
 	}
@@ -352,10 +311,11 @@ func (s *Service) getBlockPreState(ctx context.Context, b interfaces.ReadOnlyBea
 }

 // verifyBlkPreState validates input block has a valid pre-state.
-func (s *Service) verifyBlkPreState(ctx context.Context, parentRoot [field_params.RootLength]byte) error {
+func (s *Service) verifyBlkPreState(ctx context.Context, b interfaces.ReadOnlyBeaconBlock) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.verifyBlkPreState")
 	defer span.End()

+	parentRoot := b.ParentRoot()
 	// Loosen the check to HasBlock because state summary gets saved in batches
 	// during initial syncing. There's no risk given a state summary object is just a
 	// subset of the block object.
@@ -466,7 +426,7 @@ func (s *Service) ancestorByDB(ctx context.Context, r [32]byte, slot primitives.

 // This retrieves missing blocks from DB (ie. the blocks that couldn't be received over sync) and inserts them to fork choice store.
 // This is useful for block tree visualizer and additional vote accounting.
-func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, signed interfaces.ReadOnlySignedBeaconBlock,
+func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, blk interfaces.ReadOnlyBeaconBlock,
 	fCheckpoint, jCheckpoint *ethpb.Checkpoint) error {
 	pendingNodes := make([]*forkchoicetypes.BlockAndCheckpoints, 0)

@@ -476,15 +436,10 @@ func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, signed inte
 	if err != nil {
 		return err
 	}
-	// The first block can have a bogus root since the block is not inserted in forkchoice
-	roblock, err := consensus_blocks.NewROBlockWithRoot(signed, [32]byte{})
-	if err != nil {
-		return err
-	}
-	pendingNodes = append(pendingNodes, &forkchoicetypes.BlockAndCheckpoints{Block: roblock,
+	pendingNodes = append(pendingNodes, &forkchoicetypes.BlockAndCheckpoints{Block: blk,
 		JustifiedCheckpoint: jCheckpoint, FinalizedCheckpoint: fCheckpoint})
 	// As long as parent node is not in fork choice store, and parent node is in DB.
-	root := roblock.Block().ParentRoot()
+	root := blk.ParentRoot()
 	for !s.cfg.ForkChoiceStore.HasNode(root) && s.cfg.BeaconDB.HasBlock(ctx, root) {
 		b, err := s.getBlock(ctx, root)
 		if err != nil {
@@ -493,12 +448,8 @@ func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, signed inte
 		if b.Block().Slot() <= fSlot {
 			break
 		}
-		roblock, err := consensus_blocks.NewROBlockWithRoot(b, root)
-		if err != nil {
-			return err
-		}
 		root = b.Block().ParentRoot()
-		args := &forkchoicetypes.BlockAndCheckpoints{Block: roblock,
+		args := &forkchoicetypes.BlockAndCheckpoints{Block: b.Block(),
 			JustifiedCheckpoint: jCheckpoint,
 			FinalizedCheckpoint: fCheckpoint}
 		pendingNodes = append(pendingNodes, args)
--- a/beacon-chain/blockchain/process_block_test.go
+++ b/beacon-chain/blockchain/process_block_test.go
@@ -117,7 +117,7 @@ func TestCachedPreState_CanGetFromStateSummary(t *testing.T) {

 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Slot: 1, Root: root[:]}))
 	require.NoError(t, service.cfg.StateGen.SaveState(ctx, root, st))
-	require.NoError(t, service.verifyBlkPreState(ctx, wsb.Block().ParentRoot()))
+	require.NoError(t, service.verifyBlkPreState(ctx, wsb.Block()))
 }

 func TestFillForkChoiceMissingBlocks_CanSave(t *testing.T) {
@@ -140,13 +140,14 @@ func TestFillForkChoiceMissingBlocks_CanSave(t *testing.T) {
 	// the parent of the last block inserted is the tree node.
 	fcp := &ethpb.Checkpoint{Epoch: 0, Root: service.originBlockRoot[:]}
 	r0 := bytesutil.ToBytes32(roots[0])
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, r0, service.originBlockRoot, [32]byte{}, [32]byte{}, fcp, fcp)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, r0, service.originBlockRoot, [32]byte{}, fcp, fcp)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	fcp2 := &forkchoicetypes.Checkpoint{Epoch: 0, Root: r0}
 	require.NoError(t, service.cfg.ForkChoiceStore.UpdateFinalizedCheckpoint(fcp2))
+
 	err = service.fillInForkChoiceMissingBlocks(
-		context.Background(), wsb, beaconState.FinalizedCheckpoint(), beaconState.CurrentJustifiedCheckpoint())
+		context.Background(), wsb.Block(), beaconState.FinalizedCheckpoint(), beaconState.CurrentJustifiedCheckpoint())
 	require.NoError(t, err)

 	// 5 nodes from the block tree 1. B0 - B3 - B4 - B6 - B8
@@ -182,14 +183,14 @@ func TestFillForkChoiceMissingBlocks_RootsMatch(t *testing.T) {
 	// the parent of the last block inserted is the tree node.
 	fcp := &ethpb.Checkpoint{Epoch: 0, Root: service.originBlockRoot[:]}
 	r0 := bytesutil.ToBytes32(roots[0])
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, r0, service.originBlockRoot, [32]byte{}, [32]byte{}, fcp, fcp)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, r0, service.originBlockRoot, [32]byte{}, fcp, fcp)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	fcp2 := &forkchoicetypes.Checkpoint{Epoch: 0, Root: r0}
 	require.NoError(t, service.cfg.ForkChoiceStore.UpdateFinalizedCheckpoint(fcp2))

 	err = service.fillInForkChoiceMissingBlocks(
-		context.Background(), wsb, beaconState.FinalizedCheckpoint(), beaconState.CurrentJustifiedCheckpoint())
+		context.Background(), wsb.Block(), beaconState.FinalizedCheckpoint(), beaconState.CurrentJustifiedCheckpoint())
 	require.NoError(t, err)

 	// 5 nodes from the block tree 1. B0 - B3 - B4 - B6 - B8
@@ -245,7 +246,7 @@ func TestFillForkChoiceMissingBlocks_FilterFinalized(t *testing.T) {
 	// Set finalized epoch to 2.
 	require.NoError(t, service.cfg.ForkChoiceStore.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Epoch: 2, Root: r64}))
 	err = service.fillInForkChoiceMissingBlocks(
-		context.Background(), wsb, beaconState.FinalizedCheckpoint(), beaconState.CurrentJustifiedCheckpoint())
+		context.Background(), wsb.Block(), beaconState.FinalizedCheckpoint(), beaconState.CurrentJustifiedCheckpoint())
 	require.NoError(t, err)

 	// There should be 1 node: block 65
@@ -278,7 +279,7 @@ func TestFillForkChoiceMissingBlocks_FinalizedSibling(t *testing.T) {
 	require.NoError(t, err)

 	err = service.fillInForkChoiceMissingBlocks(
-		context.Background(), wsb, beaconState.FinalizedCheckpoint(), beaconState.CurrentJustifiedCheckpoint())
+		context.Background(), wsb.Block(), beaconState.FinalizedCheckpoint(), beaconState.CurrentJustifiedCheckpoint())
 	require.Equal(t, ErrNotDescendantOfFinalized.Error(), err.Error())
 }

@@ -462,7 +463,7 @@ func TestAncestor_CanUseForkchoice(t *testing.T) {
 		beaconBlock.Block.ParentRoot = bytesutil.PadTo(b.Block.ParentRoot, 32)
 		r, err := b.Block.HashTreeRoot()
 		require.NoError(t, err)
-		st, blkRoot, err := prepareForkchoiceState(context.Background(), b.Block.Slot, r, bytesutil.ToBytes32(b.Block.ParentRoot), params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+		st, blkRoot, err := prepareForkchoiceState(context.Background(), b.Block.Slot, r, bytesutil.ToBytes32(b.Block.ParentRoot), params.BeaconConfig().ZeroHash, ojc, ofc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 	}
@@ -502,7 +503,7 @@ func TestAncestor_CanUseDB(t *testing.T) {
 		util.SaveBlock(t, context.Background(), beaconDB, beaconBlock)
 	}

-	st, blkRoot, err := prepareForkchoiceState(context.Background(), 200, r200, r200, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	st, blkRoot, err := prepareForkchoiceState(context.Background(), 200, r200, r200, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))

@@ -565,9 +566,7 @@ func TestOnBlock_CanFinalize_WithOnTick(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, r, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, r)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true}))
+		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)
@@ -615,9 +614,7 @@ func TestOnBlock_CanFinalize(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, r, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, r)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true}))
+		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)
@@ -643,9 +640,7 @@ func TestOnBlock_CanFinalize(t *testing.T) {

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

@@ -693,9 +688,7 @@ func TestOnBlock_CallNewPayloadAndForkchoiceUpdated(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, r, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, r)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, r, [32]byte{}, postState, false}))
 		testState, err = service.cfg.StateGen.StateByRoot(ctx, r)
 		require.NoError(t, err)
 	}
@@ -1109,7 +1102,7 @@ func TestOnBlock_ProcessBlocksParallel(t *testing.T) {
 	logHook := logTest.NewGlobal()
 	for i := 0; i < 10; i++ {
 		fc := &ethpb.Checkpoint{}
-		st, blkRoot, err := prepareForkchoiceState(ctx, 0, wsb1.Block().ParentRoot(), [32]byte{}, [32]byte{}, [32]byte{}, fc, fc)
+		st, blkRoot, err := prepareForkchoiceState(ctx, 0, wsb1.Block().ParentRoot(), [32]byte{}, [32]byte{}, fc, fc)
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, st, blkRoot))
 		var wg sync.WaitGroup
@@ -1121,9 +1114,7 @@ func TestOnBlock_ProcessBlocksParallel(t *testing.T) {
 			postState, err := service.validateStateTransition(ctx, preState, wsb1)
 			require.NoError(t, err)
 			lock.Lock()
-			roblock, err := consensusblocks.NewROBlockWithRoot(wsb1, r1)
-			require.NoError(t, err)
-			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true}))
+			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb1, r1, [32]byte{}, postState, true}))
 			lock.Unlock()
 			wg.Done()
 		}()
@@ -1133,9 +1124,7 @@ func TestOnBlock_ProcessBlocksParallel(t *testing.T) {
 			postState, err := service.validateStateTransition(ctx, preState, wsb2)
 			require.NoError(t, err)
 			lock.Lock()
-			roblock, err := consensusblocks.NewROBlockWithRoot(wsb2, r2)
-			require.NoError(t, err)
-			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true}))
+			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb2, r2, [32]byte{}, postState, true}))
 			lock.Unlock()
 			wg.Done()
 		}()
@@ -1145,9 +1134,7 @@ func TestOnBlock_ProcessBlocksParallel(t *testing.T) {
 			postState, err := service.validateStateTransition(ctx, preState, wsb3)
 			require.NoError(t, err)
 			lock.Lock()
-			roblock, err := consensusblocks.NewROBlockWithRoot(wsb3, r3)
-			require.NoError(t, err)
-			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true}))
+			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb3, r3, [32]byte{}, postState, true}))
 			lock.Unlock()
 			wg.Done()
 		}()
@@ -1157,9 +1144,7 @@ func TestOnBlock_ProcessBlocksParallel(t *testing.T) {
 			postState, err := service.validateStateTransition(ctx, preState, wsb4)
 			require.NoError(t, err)
 			lock.Lock()
-			roblock, err := consensusblocks.NewROBlockWithRoot(wsb4, r4)
-			require.NoError(t, err)
-			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true}))
+			require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb4, r4, [32]byte{}, postState, true}))
 			lock.Unlock()
 			wg.Done()
 		}()
@@ -1234,9 +1219,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
 	}

 	for i := 6; i < 12; i++ {
@@ -1254,9 +1237,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+		err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
 		require.NoError(t, err)
 	}

@@ -1275,9 +1256,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+		err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
 		require.NoError(t, err)
 	}
 	// Check that we haven't justified the second epoch yet
@@ -1299,9 +1278,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 	postState, err := service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, firstInvalidRoot, wsb, postState))
-	roblock, err := consensusblocks.NewROBlockWithRoot(wsb, firstInvalidRoot)
-	require.NoError(t, err)
-	err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+	err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, firstInvalidRoot, [32]byte{}, postState, false})
 	require.NoError(t, err)
 	jc = service.cfg.ForkChoiceStore.JustifiedCheckpoint()
 	require.Equal(t, primitives.Epoch(2), jc.Epoch)
@@ -1329,9 +1306,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 	postState, err = service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	roblock, err = consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-	err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+	err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
 	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
@@ -1360,9 +1335,7 @@ func TestStore_NoViableHead_FCU(t *testing.T) {
 	postState, err = service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	roblock, err = consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-	err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true})
+	err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, true})
 	require.NoError(t, err)
 	// Check the newly imported block is head, it justified the right
 	// checkpoint and the node is no longer optimistic
@@ -1424,9 +1397,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
 	}

 	for i := 6; i < 12; i++ {
@@ -1444,9 +1415,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+		err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
 		require.NoError(t, err)
 	}

@@ -1466,9 +1435,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+		err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
 		require.NoError(t, err)
 	}
 	// Check that we haven't justified the second epoch yet
@@ -1490,9 +1457,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 	postState, err := service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, firstInvalidRoot, wsb, postState))
-	roblock, err := consensusblocks.NewROBlockWithRoot(wsb, firstInvalidRoot)
-	require.NoError(t, err)
-	err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+	err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, firstInvalidRoot, [32]byte{}, postState, false})
 	require.NoError(t, err)
 	jc = service.cfg.ForkChoiceStore.JustifiedCheckpoint()
 	require.Equal(t, primitives.Epoch(2), jc.Epoch)
@@ -1520,9 +1485,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 	require.NoError(t, err)
 	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
 	require.NoError(t, err)
-	rowsb, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, rowsb)
+	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, 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
@@ -1550,9 +1513,7 @@ func TestStore_NoViableHead_NewPayload(t *testing.T) {
 	postState, err = service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	roblock, err = consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-	err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true})
+	err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, true})
 	require.NoError(t, err)
 	// Check the newly imported block is head, it justified the right
 	// checkpoint and the node is no longer optimistic
@@ -1617,9 +1578,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
 	}

 	for i := 6; i < 12; i++ {
@@ -1638,9 +1597,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+		err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
 		require.NoError(t, err)
 	}

@@ -1659,9 +1616,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	postState, err := service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, lastValidRoot, wsb, postState))
-	roblock, err := consensusblocks.NewROBlockWithRoot(wsb, lastValidRoot)
-	require.NoError(t, err)
-	err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+	err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, lastValidRoot, [32]byte{}, postState, false})
 	require.NoError(t, err)
 	// save the post state and the payload Hash of this block since it will
 	// be the LVH
@@ -1688,9 +1643,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, invalidRoots[i-13], wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, invalidRoots[i-13])
-		require.NoError(t, err)
-		err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+		err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, invalidRoots[i-13], [32]byte{}, postState, false})
 		require.NoError(t, err)
 	}
 	// Check that we have justified the second epoch
@@ -1716,9 +1669,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	require.NoError(t, err)
 	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
 	require.NoError(t, err)
-	rowsb, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, rowsb)
+	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, 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
@@ -1757,9 +1708,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	postState, err = service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	roblock, err = consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-	require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true}))
+	require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, true}))
 	// 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)
@@ -1782,9 +1731,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true})
+		err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, true})
 		require.NoError(t, err)
 		st, err = service.cfg.StateGen.StateByRoot(ctx, root)
 		require.NoError(t, err)
@@ -1810,9 +1757,7 @@ func TestStore_NoViableHead_Liveness(t *testing.T) {
 	postState, err = service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-	roblock, err = consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-	err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, true})
+	err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, true})
 	require.NoError(t, err)
 	require.Equal(t, root, service.cfg.ForkChoiceStore.CachedHeadRoot())
 	sjc = service.CurrentJustifiedCheckpt()
@@ -1868,9 +1813,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))
 	}

 	for i := 6; i < 12; i++ {
@@ -1888,9 +1831,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+		err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false})
 		require.NoError(t, err)
 	}

@@ -1909,9 +1850,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 	postState, err := service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, lastValidRoot, wsb, postState))
-	roblock, err := consensusblocks.NewROBlockWithRoot(wsb, lastValidRoot)
-	require.NoError(t, err)
-	err = service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false})
+	err = service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, lastValidRoot, [32]byte{}, postState, false})
 	require.NoError(t, err)
 	// save the post state and the payload Hash of this block since it will
 	// be the LVH
@@ -1940,9 +1879,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+		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)
@@ -1968,9 +1905,7 @@ func TestNoViableHead_Reboot(t *testing.T) {
 	require.NoError(t, err)
 	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
 	require.NoError(t, err)
-	rowsb, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, rowsb)
+	_, err = service.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, 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
@@ -2060,9 +1995,7 @@ func TestOnBlock_HandleBlockAttestations(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))

 		st, err = service.HeadState(ctx)
 		require.NoError(t, err)
@@ -2111,11 +2044,7 @@ func TestOnBlock_HandleBlockAttestations(t *testing.T) {

 		st, err = service.HeadState(ctx)
 		require.NoError(t, err)
-		defaultConfig := util.DefaultBlockGenConfig()
-		defaultConfig.NumWithdrawalRequests = 1
-		defaultConfig.NumDepositRequests = 2
-		defaultConfig.NumConsolidationRequests = 1
-		b, err := util.GenerateFullBlockElectra(st, keys, defaultConfig, 1)
+		b, err := util.GenerateFullBlockElectra(st, keys, util.DefaultBlockGenConfig(), 1)
 		require.NoError(t, err)
 		wsb, err := consensusblocks.NewSignedBeaconBlock(b)
 		require.NoError(t, err)
@@ -2126,13 +2055,11 @@ func TestOnBlock_HandleBlockAttestations(t *testing.T) {
 		postState, err := service.validateStateTransition(ctx, preState, wsb)
 		require.NoError(t, err)
 		require.NoError(t, service.savePostStateInfo(ctx, root, wsb, postState))
-		roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-		require.NoError(t, err)
-		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+		require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, root, [32]byte{}, postState, false}))

 		st, err = service.HeadState(ctx)
 		require.NoError(t, err)
-		b, err = util.GenerateFullBlockElectra(st, keys, defaultConfig, 2)
+		b, err = util.GenerateFullBlockElectra(st, keys, util.DefaultBlockGenConfig(), 2)
 		require.NoError(t, err)
 		wsb, err = consensusblocks.NewSignedBeaconBlock(b)
 		require.NoError(t, err)
@@ -2140,7 +2067,7 @@ func TestOnBlock_HandleBlockAttestations(t *testing.T) {
 		// prepare another block that is not inserted
 		st3, err := transition.ExecuteStateTransition(ctx, st, wsb)
 		require.NoError(t, err)
-		b3, err := util.GenerateFullBlockElectra(st3, keys, defaultConfig, 3)
+		b3, err := util.GenerateFullBlockElectra(st3, keys, util.DefaultBlockGenConfig(), 3)
 		require.NoError(t, err)
 		wsb3, err := consensusblocks.NewSignedBeaconBlock(b3)
 		require.NoError(t, err)
@@ -2278,11 +2205,11 @@ func Test_getFCUArgs(t *testing.T) {
 	require.NoError(t, err)
 	wsb, err := consensusblocks.NewSignedBeaconBlock(b)
 	require.NoError(t, err)
-	roblock, err := consensusblocks.NewROBlockWithRoot(wsb, [32]byte{'a'})
-	require.NoError(t, err)
+
 	cfg := &postBlockProcessConfig{
 		ctx:            ctx,
-		roblock:        roblock,
+		signed:         wsb,
+		blockRoot:      [32]byte{'a'},
 		postState:      st,
 		isValidPayload: true,
 	}
@@ -2292,64 +2219,11 @@ func Test_getFCUArgs(t *testing.T) {
 	require.ErrorContains(t, "block does not exist", err)

 	// canonical branch
-	cfg.headRoot = cfg.roblock.Root()
+	cfg.headRoot = cfg.blockRoot
 	fcuArgs = &fcuConfig{}
 	err = s.getFCUArgs(cfg, fcuArgs)
 	require.NoError(t, err)
-	require.Equal(t, cfg.roblock.Root(), fcuArgs.headRoot)
-}
-
-func TestRollbackBlock(t *testing.T) {
-	service, tr := minimalTestService(t)
-	ctx := tr.ctx
-
-	st, keys := util.DeterministicGenesisState(t, 64)
-	stateRoot, err := st.HashTreeRoot(ctx)
-	require.NoError(t, err, "Could not hash genesis state")
-
-	require.NoError(t, service.saveGenesisData(ctx, st))
-
-	genesis := blocks.NewGenesisBlock(stateRoot[:])
-	wsb, err := consensusblocks.NewSignedBeaconBlock(genesis)
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wsb), "Could not save genesis block")
-	parentRoot, err := genesis.Block.HashTreeRoot()
-	require.NoError(t, err, "Could not get signing root")
-	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, st, parentRoot), "Could not save genesis state")
-	require.NoError(t, service.cfg.BeaconDB.SaveHeadBlockRoot(ctx, parentRoot), "Could not save genesis state")
-
-	st, err = service.HeadState(ctx)
-	require.NoError(t, err)
-	b, err := util.GenerateFullBlock(st, keys, util.DefaultBlockGenConfig(), 1)
-	require.NoError(t, err)
-	wsb, err = consensusblocks.NewSignedBeaconBlock(b)
-	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.Equal(t, true, service.cfg.BeaconDB.HasBlock(ctx, root))
-	hasState, err := service.cfg.StateGen.HasState(ctx, root)
-	require.NoError(t, err)
-	require.Equal(t, true, hasState)
-
-	// Set invalid parent root to trigger forkchoice error.
-	wsb.SetParentRoot([]byte("bad"))
-	roblock, err := consensusblocks.NewROBlockWithRoot(wsb, root)
-	require.NoError(t, err)
-
-	// Rollback block insertion into db and caches.
-	require.ErrorContains(t, fmt.Sprintf("could not insert block %d to fork choice store", roblock.Block().Slot()), service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
-
-	// The block should no longer exist.
-	require.Equal(t, false, service.cfg.BeaconDB.HasBlock(ctx, root))
-	hasState, err = service.cfg.StateGen.HasState(ctx, root)
-	require.NoError(t, err)
-	require.Equal(t, false, hasState)
+	require.Equal(t, cfg.blockRoot, fcuArgs.headRoot)
 }

 func fakeCommitments(n int) [][]byte {
--- a/beacon-chain/blockchain/receive_attestation.go
+++ b/beacon-chain/blockchain/receive_attestation.go
@@ -10,14 +10,12 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
-	payloadattribute "github.com/prysmaticlabs/prysm/v5/consensus-types/payload-attribute"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
 	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 // reorgLateBlockCountAttestations is the time until the end of the slot in which we count
@@ -148,35 +146,15 @@ func (s *Service) UpdateHead(ctx context.Context, proposingSlot primitives.Slot)
 		return
 	}
 	newAttHeadElapsedTime.Observe(float64(time.Since(start).Milliseconds()))
-	var attributes payloadattribute.Attributer
-	if s.inRegularSync() {
-		attributes = s.getPayloadAttribute(ctx, headState, proposingSlot, newHeadRoot[:])
-	}
-	if headState.Version() >= version.EPBS {
-		bh, err := headState.LatestBlockHash()
-		if err != nil {
-			log.WithError(err).Error("could not get latest block hash")
-			return
-		}
-		_, err = s.notifyForkchoiceUpdateEPBS(ctx, [32]byte(bh), attributes)
-		if err != nil {
-			log.WithError(err).Error("could not notify forkchoice update")
-		}
-		if err := s.saveHead(ctx, newHeadRoot, headBlock, headState); err != nil {
-			log.WithError(err).Error("could not save head")
-			return
-		}
-		if err := s.pruneAttsFromPool(headBlock); err != nil {
-			log.WithError(err).Error("could not prune attestations from pool")
-		}
-		return
-	}
 	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
 	}
@@ -198,7 +176,7 @@ func (s *Service) processAttestations(ctx context.Context, disparity time.Durati
 		}

 		hasState := s.cfg.BeaconDB.HasStateSummary(ctx, bytesutil.ToBytes32(a.GetData().BeaconBlockRoot))
-		hasBlock := s.chainHasBlock(ctx, bytesutil.ToBytes32(a.GetData().BeaconBlockRoot))
+		hasBlock := s.hasBlock(ctx, bytesutil.ToBytes32(a.GetData().BeaconBlockRoot))
 		if !(hasState && hasBlock) {
 			continue
 		}
@@ -212,26 +190,13 @@ func (s *Service) processAttestations(ctx context.Context, disparity time.Durati
 		}

 		if err := s.receiveAttestationNoPubsub(ctx, a, disparity); err != nil {
-			var fields logrus.Fields
-			if a.Version() >= version.Electra {
-				fields = logrus.Fields{
-					"slot":             a.GetData().Slot,
-					"committeeCount":   a.CommitteeBitsVal().Count(),
-					"committeeIndices": a.CommitteeBitsVal().BitIndices(),
-					"beaconBlockRoot":  fmt.Sprintf("%#x", bytesutil.Trunc(a.GetData().BeaconBlockRoot)),
-					"targetRoot":       fmt.Sprintf("%#x", bytesutil.Trunc(a.GetData().Target.Root)),
-					"aggregatedCount":  a.GetAggregationBits().Count(),
-				}
-			} else {
-				fields = logrus.Fields{
-					"slot":            a.GetData().Slot,
-					"committeeIndex":  a.GetData().CommitteeIndex,
-					"beaconBlockRoot": fmt.Sprintf("%#x", bytesutil.Trunc(a.GetData().BeaconBlockRoot)),
-					"targetRoot":      fmt.Sprintf("%#x", bytesutil.Trunc(a.GetData().Target.Root)),
-					"aggregatedCount": a.GetAggregationBits().Count(),
-				}
-			}
-			log.WithFields(fields).WithError(err).Warn("Could not process attestation for fork choice")
+			log.WithFields(logrus.Fields{
+				"slot":             a.GetData().Slot,
+				"committeeIndex":   a.GetData().CommitteeIndex,
+				"beaconBlockRoot":  fmt.Sprintf("%#x", bytesutil.Trunc(a.GetData().BeaconBlockRoot)),
+				"targetRoot":       fmt.Sprintf("%#x", bytesutil.Trunc(a.GetData().Target.Root)),
+				"aggregationCount": a.GetAggregationBits().Count(),
+			}).WithError(err).Warn("Could not process attestation for fork choice")
 		}
 	}
 }
--- a/beacon-chain/blockchain/receive_attestation_test.go
+++ b/beacon-chain/blockchain/receive_attestation_test.go
@@ -10,7 +10,6 @@ import (
 	forkchoicetypes "github.com/prysmaticlabs/prysm/v5/beacon-chain/forkchoice/types"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
-	consensus_blocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
@@ -43,11 +42,11 @@ func TestVerifyLMDFFGConsistent(t *testing.T) {

 	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, [32]byte{}, fc, fc)
+	state, r32, err := prepareForkchoiceState(ctx, 32, [32]byte{'a'}, params.BeaconConfig().ZeroHash, params.BeaconConfig().ZeroHash, fc, fc)
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, state, r32))

-	state, r33, err := prepareForkchoiceState(ctx, 33, [32]byte{'b'}, r32.Root(), params.BeaconConfig().ZeroHash, [32]byte{}, fc, fc)
+	state, r33, err := prepareForkchoiceState(ctx, 33, [32]byte{'b'}, r32, params.BeaconConfig().ZeroHash, fc, fc)
 	require.NoError(t, err)
 	require.NoError(t, f.InsertNode(ctx, state, r33))

@@ -55,12 +54,10 @@ func TestVerifyLMDFFGConsistent(t *testing.T) {
 	a := util.NewAttestation()
 	a.Data.Target.Epoch = 1
 	a.Data.Target.Root = []byte{'c'}
-	r33Root := r33.Root()
-	a.Data.BeaconBlockRoot = r33Root[:]
+	a.Data.BeaconBlockRoot = r33[:]
 	require.ErrorContains(t, wanted, service.VerifyLmdFfgConsistency(context.Background(), a))

-	r32Root := r32.Root()
-	a.Data.Target.Root = r32Root[:]
+	a.Data.Target.Root = r32[:]
 	err = service.VerifyLmdFfgConsistency(context.Background(), a)
 	require.NoError(t, err, "Could not verify LMD and FFG votes to be consistent")
 }
@@ -83,7 +80,7 @@ func TestProcessAttestations_Ok(t *testing.T) {
 	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, copied, tRoot))
 	ofc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
 	ojc := &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	state, blkRoot, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, [32]byte{}, ojc, ofc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 0, tRoot, tRoot, params.BeaconConfig().ZeroHash, ojc, ofc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	attsToSave := make([]ethpb.Att, len(atts))
@@ -119,9 +116,7 @@ func TestService_ProcessAttestationsAndUpdateHead(t *testing.T) {
 	postState, err := service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, tRoot, wsb, postState))
-	roblock, err := consensus_blocks.NewROBlockWithRoot(wsb, tRoot)
-	require.NoError(t, err)
-	require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+	require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, tRoot, [32]byte{}, postState, false}))
 	copied, err = service.cfg.StateGen.StateByRoot(ctx, tRoot)
 	require.NoError(t, err)
 	require.Equal(t, 2, fcs.NodeCount())
@@ -147,7 +142,7 @@ func TestService_ProcessAttestationsAndUpdateHead(t *testing.T) {
 	r, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
 	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b)
-	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, [32]byte{}, ojc, ojc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, ojc, ojc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	require.Equal(t, 3, fcs.NodeCount())
@@ -181,9 +176,7 @@ func TestService_UpdateHead_NoAtts(t *testing.T) {
 	postState, err := service.validateStateTransition(ctx, preState, wsb)
 	require.NoError(t, err)
 	require.NoError(t, service.savePostStateInfo(ctx, tRoot, wsb, postState))
-	roblock, err := consensus_blocks.NewROBlockWithRoot(wsb, tRoot)
-	require.NoError(t, err)
-	require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, roblock, [32]byte{}, postState, false}))
+	require.NoError(t, service.postBlockProcess(&postBlockProcessConfig{ctx, wsb, tRoot, [32]byte{}, postState, false}))
 	require.Equal(t, 2, fcs.NodeCount())
 	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wsb))
 	require.Equal(t, tRoot, service.head.root)
@@ -196,7 +189,7 @@ func TestService_UpdateHead_NoAtts(t *testing.T) {
 	r, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
 	util.SaveBlock(t, ctx, service.cfg.BeaconDB, b)
-	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, [32]byte{}, ojc, ojc)
+	state, blkRoot, err := prepareForkchoiceState(ctx, 2, r, service.originBlockRoot, [32]byte{'b'}, ojc, ojc)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.ForkChoiceStore.InsertNode(ctx, state, blkRoot))
 	require.Equal(t, 3, fcs.NodeCount())
--- a/beacon-chain/blockchain/receive_block.go
+++ b/beacon-chain/blockchain/receive_block.go
@@ -17,18 +17,16 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/v5/config/features"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
-	consensus_blocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
-	consensusblocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpbv1 "github.com/prysmaticlabs/prysm/v5/proto/eth/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1/attestation"
 	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
+	"go.opencensus.io/trace"
 	"golang.org/x/sync/errgroup"
 )

@@ -41,28 +39,22 @@ var epochsSinceFinalityExpandCache = primitives.Epoch(4)
 // BlockReceiver interface defines the methods of chain service for receiving and processing new blocks.
 type BlockReceiver interface {
 	ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySignedBeaconBlock, blockRoot [32]byte, avs das.AvailabilityStore) error
-	ReceiveExecutionPayloadEnvelope(ctx context.Context, env interfaces.ROSignedExecutionPayloadEnvelope, avs das.AvailabilityStore) error
 	ReceiveBlockBatch(ctx context.Context, blocks []blocks.ROBlock, avs das.AvailabilityStore) error
 	HasBlock(ctx context.Context, root [32]byte) bool
 	RecentBlockSlot(root [32]byte) (primitives.Slot, error)
 	BlockBeingSynced([32]byte) bool
 }

-// PayloadAttestationReceiver defines methods of the chain service for receiving
-// and processing new payload attestations and payload attestation messages
-type PayloadAttestationReceiver interface {
-	ReceivePayloadAttestationMessage(ctx context.Context, a *ethpb.PayloadAttestationMessage) error
-}
-
 // BlobReceiver interface defines the methods of chain service for receiving new
 // blobs
 type BlobReceiver interface {
 	ReceiveBlob(context.Context, blocks.VerifiedROBlob) error
 }

-// ExecutionPayloadReceiver interface defines the methods of chain service for receiving `ROExecutionPayloadEnvelope`.
-type ExecutionPayloadReceiver interface {
-	ReceiveExecutionPayloadEnvelope(ctx context.Context, envelope interfaces.ROSignedExecutionPayloadEnvelope, _ das.AvailabilityStore) error
+// DataColumnReceiver interface defines the methods of chain service for receiving new
+// data columns
+type DataColumnReceiver interface {
+	ReceiveDataColumn(context.Context, *ethpb.DataColumnSidecar) error
 }

 // SlashingReceiver interface defines the methods of chain service for receiving validated slashing over the wire.
@@ -91,41 +83,59 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySig
 	if err != nil {
 		return err
 	}
+	rob, err := blocks.NewROBlockWithRoot(block, blockRoot)
+	if err != nil {
+		return err
+	}
+
 	preState, err := s.getBlockPreState(ctx, blockCopy.Block())
 	if err != nil {
 		return errors.Wrap(err, "could not get block's prestate")
 	}
+	// Save current justified and finalized epochs for future use.
+	currStoreJustifiedEpoch := s.CurrentJustifiedCheckpt().Epoch
+	currStoreFinalizedEpoch := s.FinalizedCheckpt().Epoch
+	currentEpoch := coreTime.CurrentEpoch(preState)

-	currentCheckpoints := s.saveCurrentCheckpoints(preState)
-	roblock, err := consensus_blocks.NewROBlockWithRoot(blockCopy, blockRoot)
+	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
 	if err != nil {
 		return err
 	}
+	eg, _ := errgroup.WithContext(ctx)
 	var postState state.BeaconState
+	eg.Go(func() error {
+		var err error
+		postState, err = s.validateStateTransition(ctx, preState, blockCopy)
+		if err != nil {
+			return errors.Wrap(err, "failed to validate consensus state transition function")
+		}
+		return nil
+	})
 	var isValidPayload bool
-	var daWaitedTime time.Duration
-	if blockCopy.Version() >= version.EPBS {
-		postState, err = s.validateStateTransition(ctx, preState, roblock)
+	eg.Go(func() error {
+		var err error
+		isValidPayload, err = s.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, blockCopy, blockRoot)
 		if err != nil {
-			return errors.Wrap(err, "could not validate state transition")
+			return errors.Wrap(err, "could not notify the engine of the new payload")
 		}
-		optimistic, err := s.IsOptimisticForRoot(ctx, roblock.Block().ParentRoot())
-		if err != nil {
-			return errors.Wrap(err, "could not check if parent is optimistic")
+		return nil
+	})
+	if err := eg.Wait(); err != nil {
+		return err
+	}
+	daStartTime := time.Now()
+	if avs != nil {
+		if err := avs.IsDataAvailable(ctx, s.CurrentSlot(), rob); err != nil {
+			return errors.Wrap(err, "could not validate blob data availability (AvailabilityStore.IsDataAvailable)")
 		}
-		// if the parent is not optimistic then we can set the block as
-		// not optimistic.
-		isValidPayload = !optimistic
 	} else {
-		postState, isValidPayload, err = s.validateExecutionAndConsensus(ctx, preState, roblock)
-		if err != nil {
-			return err
-		}
-		daWaitedTime, err = s.handleDA(ctx, blockCopy, blockRoot, avs)
-		if err != nil {
-			return err
+		if err := s.isDataAvailable(ctx, blockRoot, blockCopy); err != nil {
+			return errors.Wrap(err, "could not validate blob data availability")
 		}
 	}
+	daWaitedTime := time.Since(daStartTime)
+	dataAvailWaitedTime.Observe(float64(daWaitedTime.Milliseconds()))
+
 	// Defragment the state before continuing block processing.
 	s.defragmentState(postState)

@@ -137,7 +147,8 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySig
 	}
 	args := &postBlockProcessConfig{
 		ctx:            ctx,
-		roblock:        roblock,
+		signed:         blockCopy,
+		blockRoot:      blockRoot,
 		postState:      postState,
 		isValidPayload: isValidPayload,
 	}
@@ -146,9 +157,29 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySig
 		tracing.AnnotateError(span, err)
 		return err
 	}
-	if err := s.updateCheckpoints(ctx, currentCheckpoints, preState, postState, blockRoot); err != nil {
-		return err
+	if coreTime.CurrentEpoch(postState) > currentEpoch && s.cfg.ForkChoiceStore.IsCanonical(blockRoot) {
+		headSt, err := s.HeadState(ctx)
+		if err != nil {
+			return errors.Wrap(err, "could not get head state")
+		}
+		if err := reportEpochMetrics(ctx, postState, headSt); err != nil {
+			log.WithError(err).Error("could not report epoch metrics")
+		}
 	}
+	if err := s.updateJustificationOnBlock(ctx, preState, postState, currStoreJustifiedEpoch); err != nil {
+		return errors.Wrap(err, "could not update justified checkpoint")
+	}
+
+	newFinalized, err := s.updateFinalizationOnBlock(ctx, preState, postState, currStoreFinalizedEpoch)
+	if err != nil {
+		return errors.Wrap(err, "could not update finalized checkpoint")
+	}
+	// Send finalized events and finalized deposits in the background
+	if newFinalized {
+		// hook to process all post state finalization tasks
+		s.executePostFinalizationTasks(ctx, postState)
+	}
+
 	// If slasher is configured, forward the attestations in the block via an event feed for processing.
 	if features.Get().EnableSlasher {
 		go s.sendBlockAttestationsToSlasher(blockCopy, preState)
@@ -168,144 +199,37 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.ReadOnlySig
 	if err := s.handleCaches(); err != nil {
 		return err
 	}
-	s.reportPostBlockProcessing(blockCopy, blockRoot, receivedTime, daWaitedTime)
-	return nil
-}

-type ffgCheckpoints struct {
-	j, f, c primitives.Epoch
-}
-
-func (s *Service) saveCurrentCheckpoints(state state.BeaconState) (cp ffgCheckpoints) {
-	// Save current justified and finalized epochs for future use.
-	cp.j = s.CurrentJustifiedCheckpt().Epoch
-	cp.f = s.FinalizedCheckpt().Epoch
-	cp.c = coreTime.CurrentEpoch(state)
-	return
-}
-
-func (s *Service) updateCheckpoints(
-	ctx context.Context,
-	cp ffgCheckpoints,
-	preState, postState state.BeaconState,
-	blockRoot [32]byte,
-) error {
-	if coreTime.CurrentEpoch(postState) > cp.c && s.cfg.ForkChoiceStore.IsCanonical(blockRoot) {
-		headSt, err := s.HeadState(ctx)
-		if err != nil {
-			return errors.Wrap(err, "could not get head state")
-		}
-		if err := reportEpochMetrics(ctx, postState, headSt); err != nil {
-			log.WithError(err).Error("could not report epoch metrics")
-		}
-	}
-	if err := s.updateJustificationOnBlock(ctx, preState, postState, cp.j); err != nil {
-		return errors.Wrap(err, "could not update justified checkpoint")
-	}
-
-	newFinalized, err := s.updateFinalizationOnBlock(ctx, preState, postState, cp.f)
-	if err != nil {
-		return errors.Wrap(err, "could not update finalized checkpoint")
-	}
-	// Send finalized events and finalized deposits in the background
-	if newFinalized {
-		// hook to process all post state finalization tasks
-		s.executePostFinalizationTasks(ctx, postState)
-	}
-	return nil
-}
-
-func (s *Service) validateExecutionAndConsensus(
-	ctx context.Context,
-	preState state.BeaconState,
-	block consensusblocks.ROBlock,
-) (state.BeaconState, bool, error) {
-	preStateVersion, preStateHeader, err := getStateVersionAndPayload(preState)
-	if err != nil {
-		return nil, false, err
-	}
-	eg, _ := errgroup.WithContext(ctx)
-	var postState state.BeaconState
-	eg.Go(func() error {
-		var err error
-		postState, err = s.validateStateTransition(ctx, preState, block)
-		if err != nil {
-			return errors.Wrap(err, "failed to validate consensus state transition function")
-		}
-		return nil
-	})
-	var isValidPayload bool
-	eg.Go(func() error {
-		var err error
-		isValidPayload, err = s.validateExecutionOnBlock(ctx, preStateVersion, preStateHeader, block)
-		if err != nil {
-			return errors.Wrap(err, "could not notify the engine of the new payload")
-		}
-		return nil
-	})
-	if err := eg.Wait(); err != nil {
-		return nil, false, err
-	}
-	return postState, isValidPayload, nil
-}
-
-func (s *Service) handleDA(
-	ctx context.Context,
-	block interfaces.SignedBeaconBlock,
-	blockRoot [32]byte,
-	avs das.AvailabilityStore,
-) (time.Duration, error) {
-	daStartTime := time.Now()
-	if avs != nil {
-		rob, err := blocks.NewROBlockWithRoot(block, blockRoot)
-		if err != nil {
-			return 0, err
-		}
-		if err := avs.IsDataAvailable(ctx, s.CurrentSlot(), rob); err != nil {
-			return 0, errors.Wrap(err, "could not validate blob data availability (AvailabilityStore.IsDataAvailable)")
-		}
-	} else {
-		if err := s.isDataAvailable(ctx, blockRoot, block); err != nil {
-			return 0, errors.Wrap(err, "could not validate blob data availability")
-		}
-	}
-	daWaitedTime := time.Since(daStartTime)
-	dataAvailWaitedTime.Observe(float64(daWaitedTime.Milliseconds()))
-	return daWaitedTime, nil
-}
-
-func (s *Service) reportPostBlockProcessing(
-	block interfaces.SignedBeaconBlock,
-	blockRoot [32]byte,
-	receivedTime time.Time,
-	daWaitedTime time.Duration,
-) {
 	// Reports on block and fork choice metrics.
 	cp := s.cfg.ForkChoiceStore.FinalizedCheckpoint()
 	finalized := &ethpb.Checkpoint{Epoch: cp.Epoch, Root: bytesutil.SafeCopyBytes(cp.Root[:])}
-	reportSlotMetrics(block.Block().Slot(), s.HeadSlot(), s.CurrentSlot(), finalized)
+	reportSlotMetrics(blockCopy.Block().Slot(), s.HeadSlot(), s.CurrentSlot(), finalized)

 	// Log block sync status.
 	cp = s.cfg.ForkChoiceStore.JustifiedCheckpoint()
 	justified := &ethpb.Checkpoint{Epoch: cp.Epoch, Root: bytesutil.SafeCopyBytes(cp.Root[:])}
-	if err := logBlockSyncStatus(block.Block(), blockRoot, justified, finalized, receivedTime, uint64(s.genesisTime.Unix()), daWaitedTime); err != nil {
+	if err := logBlockSyncStatus(blockCopy.Block(), blockRoot, justified, finalized, receivedTime, uint64(s.genesisTime.Unix()), daWaitedTime); err != nil {
 		log.WithError(err).Error("Unable to log block sync status")
 	}
 	// Log payload data
-	if err := logPayload(block.Block()); err != nil {
+	if err := logPayload(blockCopy.Block()); err != nil {
 		log.WithError(err).Error("Unable to log debug block payload data")
 	}
 	// Log state transition data.
-	if err := logStateTransitionData(block.Block()); err != nil {
+	if err := logStateTransitionData(blockCopy.Block()); err != nil {
 		log.WithError(err).Error("Unable to log state transition data")
 	}
+
 	timeWithoutDaWait := time.Since(receivedTime) - daWaitedTime
 	chainServiceProcessingTime.Observe(float64(timeWithoutDaWait.Milliseconds()))
+
+	return nil
 }

 func (s *Service) executePostFinalizationTasks(ctx context.Context, finalizedState state.BeaconState) {
 	finalized := s.cfg.ForkChoiceStore.FinalizedCheckpoint()
 	go func() {
+		finalizedState.SaveValidatorIndices() // used to handle Validator index invariant from EIP6110
 		s.sendNewFinalizedEvent(ctx, finalizedState)
 	}()
 	depCtx, cancel := context.WithTimeout(context.Background(), depositDeadline)
@@ -382,9 +306,6 @@ func (s *Service) ReceiveBlockBatch(ctx context.Context, blocks []blocks.ROBlock

 // HasBlock returns true if the block of the input root exists in initial sync blocks cache or DB.
 func (s *Service) HasBlock(ctx context.Context, root [32]byte) bool {
-	if s.BlockBeingSynced(root) {
-		return false
-	}
 	return s.hasBlockInInitSyncOrDB(ctx, root)
 }

@@ -588,16 +509,16 @@ func (s *Service) sendBlockAttestationsToSlasher(signed interfaces.ReadOnlySigne
 }

 // validateExecutionOnBlock notifies the engine of the incoming block execution payload and returns true if the payload is valid
-func (s *Service) validateExecutionOnBlock(ctx context.Context, ver int, header interfaces.ExecutionData, block consensusblocks.ROBlock) (bool, error) {
-	isValidPayload, err := s.notifyNewPayload(ctx, ver, header, block)
+func (s *Service) validateExecutionOnBlock(ctx context.Context, ver int, header interfaces.ExecutionData, signed interfaces.ReadOnlySignedBeaconBlock, blockRoot [32]byte) (bool, error) {
+	isValidPayload, err := s.notifyNewPayload(ctx, ver, header, signed)
 	if err != nil {
 		s.cfg.ForkChoiceStore.Lock()
-		err = s.handleInvalidExecutionError(ctx, err, block.Root(), block.Block().ParentRoot())
+		err = s.handleInvalidExecutionError(ctx, err, blockRoot, signed.Block().ParentRoot())
 		s.cfg.ForkChoiceStore.Unlock()
 		return false, err
 	}
-	if block.Block().Version() < version.Capella && isValidPayload {
-		if err := s.validateMergeTransitionBlock(ctx, ver, header, block); err != nil {
+	if signed.Version() < version.Capella && isValidPayload {
+		if err := s.validateMergeTransitionBlock(ctx, ver, header, signed); err != nil {
 			return isValidPayload, err
 		}
 	}
--- a/beacon-chain/blockchain/receive_block_test.go
+++ b/beacon-chain/blockchain/receive_block_test.go
@@ -278,8 +278,6 @@ func TestService_HasBlock(t *testing.T) {
 	r, err = b.Block.HashTreeRoot()
 	require.NoError(t, err)
 	require.Equal(t, true, s.HasBlock(context.Background(), r))
-	s.blockBeingSynced.set(r)
-	require.Equal(t, false, s.HasBlock(context.Background(), r))
 }

 func TestCheckSaveHotStateDB_Enabling(t *testing.T) {
--- a/beacon-chain/blockchain/receive_execution_payload_envelope.go
+++ b/beacon-chain/blockchain/receive_execution_payload_envelope.go
@@ -1,244 +0,0 @@
-package blockchain
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"time"
-
-	"github.com/ethereum/go-ethereum/common"
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/epbs"
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/transition"
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/das"
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/execution"
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/sirupsen/logrus"
-	"go.opencensus.io/trace"
-	"golang.org/x/sync/errgroup"
-)
-
-// ReceiveExecutionPayloadEnvelope is a function that defines the operations (minus pubsub)
-// that are performed on a received execution payload envelope. The operations consist of:
-//  1. Validate the payload, apply state transition.
-//  2. Apply fork choice to the processed payload
-//  3. Save latest head info
-func (s *Service) ReceiveExecutionPayloadEnvelope(ctx context.Context, signed interfaces.ROSignedExecutionPayloadEnvelope, _ das.AvailabilityStore) error {
-	receivedTime := time.Now()
-	envelope, err := signed.Envelope()
-	if err != nil {
-		return err
-	}
-	root := envelope.BeaconBlockRoot()
-	s.payloadBeingSynced.set(envelope)
-	defer s.payloadBeingSynced.unset(root)
-
-	preState, err := s.getPayloadEnvelopePrestate(ctx, envelope)
-	if err != nil {
-		return errors.Wrap(err, "could not get prestate")
-	}
-	log.WithField("slot", preState.Slot()).Info("receiving envelope with prestate slot")
-
-	eg, _ := errgroup.WithContext(ctx)
-	eg.Go(func() error {
-		if err := epbs.ValidatePayloadStateTransition(ctx, preState, envelope); err != nil {
-			return errors.Wrap(err, "failed to validate consensus state transition function")
-		}
-		return nil
-	})
-	var isValidPayload bool
-	eg.Go(func() error {
-		var err error
-		isValidPayload, err = s.validateExecutionOnEnvelope(ctx, envelope)
-		if err != nil {
-			return errors.Wrap(err, "could not notify the engine of the new payload")
-		}
-		return nil
-	})
-
-	if err := eg.Wait(); err != nil {
-		return err
-	}
-	daStartTime := time.Now()
-	// TODO: Add DA check
-	daWaitedTime := time.Since(daStartTime)
-	dataAvailWaitedTime.Observe(float64(daWaitedTime.Milliseconds()))
-	if err := s.savePostPayload(ctx, signed, preState); err != nil {
-		return err
-	}
-	if err := s.insertPayloadEnvelope(envelope); err != nil {
-		return errors.Wrap(err, "could not insert payload to forkchoice")
-	}
-	if isValidPayload {
-		s.ForkChoicer().Lock()
-		if err := s.ForkChoicer().SetOptimisticToValid(ctx, root); err != nil {
-			s.ForkChoicer().Unlock()
-			return errors.Wrap(err, "could not set optimistic payload to valid")
-		}
-		s.ForkChoicer().Unlock()
-	}
-
-	headRoot, err := s.HeadRoot(ctx)
-	if err != nil {
-		log.WithError(err).Error("could not get headroot to compute attributes")
-		return nil
-	}
-	logWithFields := logrus.WithFields(logrus.Fields{
-		"blockRoot": fmt.Sprintf("%#x", root),
-		"stateRoot": fmt.Sprintf("%#x", envelope.StateRoot()),
-		"builder":   envelope.BuilderIndex(),
-	})
-	if bytes.Equal(headRoot, root[:]) {
-		slot := envelope.Slot()
-		if slot == 0 {
-			slot = preState.Slot()
-		}
-		attr := s.getPayloadAttribute(ctx, preState, slot+1, headRoot)
-		execution, err := envelope.Execution()
-		if err != nil {
-			log.WithError(err).Error("could not get execution data")
-			return nil
-		}
-		blockHash := [32]byte(execution.BlockHash())
-		payloadID, err := s.notifyForkchoiceUpdateEPBS(ctx, blockHash, attr)
-		if err != nil {
-			if IsInvalidBlock(err) {
-				// TODO handle the lvh here
-				return err
-			}
-			return nil
-		}
-		if attr != nil && !attr.IsEmpty() && payloadID != nil {
-			var pid [8]byte
-			copy(pid[:], payloadID[:])
-			log.WithFields(logrus.Fields{
-				"blockRoot": fmt.Sprintf("%#x", bytesutil.Trunc(headRoot)),
-				"headSlot":  slot,
-				"payloadID": fmt.Sprintf("%#x", bytesutil.Trunc(payloadID[:])),
-			}).Info("Forkchoice updated with payload attributes for proposal")
-			s.cfg.PayloadIDCache.Set(slot+1, root, pid)
-		}
-		// simply update the headstate in head
-		s.headLock.Lock()
-		s.head.state = preState.Copy()
-		s.headLock.Unlock()
-		// update the NSC with the hash for the full block
-		if err := transition.UpdateNextSlotCache(ctx, blockHash[:], preState); err != nil {
-			log.WithError(err).Error("could not update next slot cache with payload")
-		}
-		logWithFields = logWithFields.WithFields(logrus.Fields{
-			"blockHash": fmt.Sprintf("%#x", blockHash),
-		})
-	}
-	timeWithoutDaWait := time.Since(receivedTime) - daWaitedTime
-	executionEngineProcessingTime.Observe(float64(timeWithoutDaWait.Milliseconds()))
-	logWithFields.Info("Successfully processed execution payload envelope")
-	return nil
-}
-
-// notifyNewPayload signals execution engine on a new payload.
-// It returns true if the EL has returned VALID for the block
-func (s *Service) notifyNewEnvelope(ctx context.Context, envelope interfaces.ROExecutionPayloadEnvelope) (bool, error) {
-	ctx, span := trace.StartSpan(ctx, "blockChain.notifyNewPayload")
-	defer span.End()
-
-	payload, err := envelope.Execution()
-	if err != nil {
-		return false, errors.Wrap(err, "could not get execution payload")
-	}
-
-	versionedHashes := envelope.VersionedHashes()
-	root := envelope.BeaconBlockRoot()
-	parentRoot, err := s.ParentRoot(root)
-	if err != nil {
-		return false, errors.Wrap(err, "could not get parent block root")
-	}
-	pr := common.Hash(parentRoot)
-	requests := envelope.ExecutionRequests()
-	lastValidHash, err := s.cfg.ExecutionEngineCaller.NewPayload(ctx, payload, versionedHashes, &pr, requests)
-	switch {
-	case err == nil:
-		newPayloadValidNodeCount.Inc()
-		return true, nil
-	case errors.Is(err, execution.ErrAcceptedSyncingPayloadStatus):
-		newPayloadOptimisticNodeCount.Inc()
-		log.WithFields(logrus.Fields{
-			"payloadBlockHash": fmt.Sprintf("%#x", bytesutil.Trunc(payload.BlockHash())),
-		}).Info("Called new payload with optimistic block")
-		return false, nil
-	case errors.Is(err, execution.ErrInvalidPayloadStatus):
-		lvh := bytesutil.ToBytes32(lastValidHash)
-		return false, invalidBlock{
-			error:         ErrInvalidPayload,
-			lastValidHash: lvh,
-		}
-	default:
-		return false, errors.WithMessage(ErrUndefinedExecutionEngineError, err.Error())
-	}
-}
-
-// validateExecutionOnEnvelope notifies the engine of the incoming execution payload and returns true if the payload is valid
-func (s *Service) validateExecutionOnEnvelope(ctx context.Context, e interfaces.ROExecutionPayloadEnvelope) (bool, error) {
-	isValidPayload, err := s.notifyNewEnvelope(ctx, e)
-	if err == nil {
-		return isValidPayload, nil
-	}
-	blockRoot := e.BeaconBlockRoot()
-	parentRoot, rootErr := s.ParentRoot(blockRoot)
-	if rootErr != nil {
-		return false, errors.Wrap(rootErr, "could not get parent block root")
-	}
-	s.cfg.ForkChoiceStore.Lock()
-	err = s.handleInvalidExecutionError(ctx, err, blockRoot, parentRoot)
-	s.cfg.ForkChoiceStore.Unlock()
-	return false, err
-}
-
-func (s *Service) getPayloadEnvelopePrestate(ctx context.Context, e interfaces.ROExecutionPayloadEnvelope) (state.BeaconState, error) {
-	ctx, span := trace.StartSpan(ctx, "blockChain.getPayloadEnvelopePreState")
-	defer span.End()
-
-	// Verify incoming payload has a valid pre state.
-	root := e.BeaconBlockRoot()
-	// Verify the referred block is known to forkchoice
-	if !s.InForkchoice(root) {
-		return nil, errors.New("Cannot import execution payload envelope for unknown block")
-	}
-	if err := s.verifyBlkPreState(ctx, root); err != nil {
-		return nil, errors.Wrap(err, "could not verify payload prestate")
-	}
-
-	preState, err := s.cfg.StateGen.StateByRoot(ctx, root)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not get pre state")
-	}
-	if preState == nil || preState.IsNil() {
-		return nil, errors.Wrap(err, "nil pre state")
-	}
-	return preState, nil
-}
-
-func (s *Service) savePostPayload(ctx context.Context, signed interfaces.ROSignedExecutionPayloadEnvelope, st state.BeaconState) error {
-	if err := s.cfg.BeaconDB.SaveBlindPayloadEnvelope(ctx, signed); err != nil {
-		return err
-	}
-	envelope, err := signed.Envelope()
-	if err != nil {
-		return err
-	}
-	execution, err := envelope.Execution()
-	if err != nil {
-		return err
-	}
-	r := envelope.BeaconBlockRoot()
-	if err := s.cfg.StateGen.SaveState(ctx, [32]byte(execution.BlockHash()), st); err != nil {
-		log.Warnf("Rolling back insertion of block with root %#x", r)
-		if err := s.cfg.BeaconDB.DeleteBlock(ctx, r); err != nil {
-			log.WithError(err).Errorf("Could not delete block with block root %#x", r)
-		}
-		return errors.Wrap(err, "could not save state")
-	}
-	return nil
-}
--- a/beacon-chain/blockchain/receive_execution_payload_envelope_test.go
+++ b/beacon-chain/blockchain/receive_execution_payload_envelope_test.go
@@ -1,100 +0,0 @@
-package blockchain
-
-import (
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/cache"
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/das"
-	mockExecution "github.com/prysmaticlabs/prysm/v5/beacon-chain/execution/testing"
-	forkchoicetypes "github.com/prysmaticlabs/prysm/v5/beacon-chain/forkchoice/types"
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
-	enginev1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
-	"github.com/prysmaticlabs/prysm/v5/testing/require"
-	"github.com/prysmaticlabs/prysm/v5/testing/util"
-	"github.com/prysmaticlabs/prysm/v5/testing/util/random"
-)
-
-func Test_getPayloadEnvelopePrestate(t *testing.T) {
-	service, tr := minimalTestService(t)
-	ctx, fcs := tr.ctx, tr.fcs
-
-	gs, _ := util.DeterministicGenesisStateEpbs(t, 32)
-	require.NoError(t, service.saveGenesisData(ctx, gs))
-	require.NoError(t, fcs.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: service.originBlockRoot}))
-
-	p := random.ExecutionPayloadEnvelope(t)
-	p.BeaconBlockRoot = service.originBlockRoot[:]
-	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
-	require.NoError(t, err)
-
-	_, err = service.getPayloadEnvelopePrestate(ctx, e)
-	require.NoError(t, err)
-}
-
-func Test_notifyNewEnvelope(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
-	ctx, fcs := tr.ctx, tr.fcs
-	gs, _ := util.DeterministicGenesisStateEpbs(t, 32)
-	require.NoError(t, service.saveGenesisData(ctx, gs))
-	require.NoError(t, fcs.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: service.originBlockRoot}))
-	p := random.ExecutionPayloadEnvelope(t)
-	p.BeaconBlockRoot = service.originBlockRoot[:]
-	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
-	require.NoError(t, err)
-	engine := &mockExecution.EngineClient{}
-	service.cfg.ExecutionEngineCaller = engine
-	isValidPayload, err := service.notifyNewEnvelope(ctx, e)
-	require.NoError(t, err)
-	require.Equal(t, true, isValidPayload)
-}
-
-func Test_validateExecutionOnEnvelope(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
-	ctx, fcs := tr.ctx, tr.fcs
-	gs, _ := util.DeterministicGenesisStateEpbs(t, 32)
-	require.NoError(t, service.saveGenesisData(ctx, gs))
-	require.NoError(t, fcs.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: service.originBlockRoot}))
-	p := random.ExecutionPayloadEnvelope(t)
-	p.BeaconBlockRoot = service.originBlockRoot[:]
-	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
-	require.NoError(t, err)
-	engine := &mockExecution.EngineClient{}
-	service.cfg.ExecutionEngineCaller = engine
-	isValidPayload, err := service.validateExecutionOnEnvelope(ctx, e)
-	require.NoError(t, err)
-	require.Equal(t, true, isValidPayload)
-}
-
-func Test_ReceiveExecutionPayloadEnvelope(t *testing.T) {
-	service, tr := minimalTestService(t, WithPayloadIDCache(cache.NewPayloadIDCache()))
-	ctx, fcs := tr.ctx, tr.fcs
-	gs, _ := util.DeterministicGenesisStateEpbs(t, 32)
-	require.NoError(t, service.saveGenesisData(ctx, gs))
-	require.NoError(t, fcs.UpdateFinalizedCheckpoint(&forkchoicetypes.Checkpoint{Root: service.originBlockRoot}))
-	post := gs.Copy()
-	p := &enginev1.ExecutionPayloadEnvelope{
-		Payload: &enginev1.ExecutionPayloadElectra{
-			ParentHash: make([]byte, 32),
-			BlockHash:  make([]byte, 32),
-		},
-		BeaconBlockRoot:    service.originBlockRoot[:],
-		BlobKzgCommitments: make([][]byte, 0),
-		StateRoot:          make([]byte, 32),
-		ExecutionRequests:  &enginev1.ExecutionRequests{},
-	}
-	e, err := blocks.WrappedROExecutionPayloadEnvelope(p)
-	require.NoError(t, err)
-	das := &das.MockAvailabilityStore{}
-
-	blockHeader := post.LatestBlockHeader()
-	prevStateRoot, err := post.HashTreeRoot(ctx)
-	require.NoError(t, err)
-	blockHeader.StateRoot = prevStateRoot[:]
-	require.NoError(t, post.SetLatestBlockHeader(blockHeader))
-	stRoot, err := post.HashTreeRoot(ctx)
-	require.NoError(t, err)
-	p.StateRoot = stRoot[:]
-	engine := &mockExecution.EngineClient{}
-	service.cfg.ExecutionEngineCaller = engine
-	require.NoError(t, service.ReceiveExecutionPayloadEnvelope(ctx, e, das))
-}
--- a/beacon-chain/blockchain/receive_payload_attestation_message.go
+++ b/beacon-chain/blockchain/receive_payload_attestation_message.go
@@ -1,33 +0,0 @@
-package blockchain
-
-import (
-	"context"
-	"slices"
-
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/core/helpers"
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	eth "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
-)
-
-func (s *Service) ReceivePayloadAttestationMessage(ctx context.Context, a *eth.PayloadAttestationMessage) error {
-	if err := helpers.ValidateNilPayloadAttestationMessage(a); err != nil {
-		return err
-	}
-	root := [32]byte(a.Data.BeaconBlockRoot)
-	st, err := s.HeadStateReadOnly(ctx)
-	if err != nil {
-		return err
-	}
-	ptc, err := helpers.GetPayloadTimelinessCommittee(ctx, st, a.Data.Slot)
-	if err != nil {
-		return err
-	}
-	idx := slices.Index(ptc, a.ValidatorIndex)
-	if idx == -1 {
-		return errInvalidValidatorIndex
-	}
-	if s.cfg.PayloadAttestationCache.Seen(root, uint64(primitives.ValidatorIndex(idx))) {
-		return nil
-	}
-	return s.cfg.PayloadAttestationCache.Add(a, uint64(idx))
-}
--- a/beacon-chain/blockchain/receive_sidecar.go
+++ b/beacon-chain/blockchain/receive_sidecar.go
@@ -0,0 +1,12 @@
+package blockchain
+
+import (
+	"context"
+
+	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
+)
+
+func (s *Service) ReceiveDataColumn(ctx context.Context, ds *ethpb.DataColumnSidecar) error {
+	// TODO
+	return nil
+}
--- a/beacon-chain/blockchain/service.go
+++ b/beacon-chain/blockchain/service.go
@@ -36,14 +36,13 @@ import (
 	fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/v5/config/params"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
-	consensus_blocks "github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	prysmTime "github.com/prysmaticlabs/prysm/v5/time"
 	"github.com/prysmaticlabs/prysm/v5/time/slots"
+	"go.opencensus.io/trace"
 )

 // Service represents a service that handles the internal
@@ -66,7 +65,6 @@ type Service struct {
 	syncComplete                  chan struct{}
 	blobNotifiers                 *blobNotifierMap
 	blockBeingSynced              *currentlySyncingBlock
-	payloadBeingSynced            *currentlySyncingPayload
 	blobStorage                   *filesystem.BlobStorage
 	lastPublishedLightClientEpoch primitives.Epoch
 }
@@ -77,8 +75,6 @@ type config struct {
 	ChainStartFetcher       execution.ChainStartFetcher
 	BeaconDB                db.HeadAccessDatabase
 	DepositCache            cache.DepositCache
-	PayloadAttestationCache *cache.PayloadAttestationCache
-	PayloadEnvelopeCache    *sync.Map
 	PayloadIDCache          *cache.PayloadIDCache
 	TrackedValidatorsCache  *cache.TrackedValidatorsCache
 	AttPool                 attestations.Pool
@@ -183,7 +179,6 @@ func NewService(ctx context.Context, opts ...Option) (*Service, error) {
 		blobNotifiers:        bn,
 		cfg:                  &config{},
 		blockBeingSynced:     &currentlySyncingBlock{roots: make(map[[32]byte]struct{})},
-		payloadBeingSynced:   &currentlySyncingPayload{roots: make(map[[32]byte]primitives.PTCStatus)},
 	}
 	for _, opt := range opts {
 		if err := opt(srv); err != nil {
@@ -308,15 +303,7 @@ func (s *Service) StartFromSavedState(saved state.BeaconState) error {
 	if err != nil {
 		return errors.Wrap(err, "could not get finalized checkpoint state")
 	}
-	finalizedBlock, err := s.cfg.BeaconDB.Block(s.ctx, fRoot)
-	if err != nil {
-		return errors.Wrap(err, "could not get finalized checkpoint block")
-	}
-	roblock, err := consensus_blocks.NewROBlockWithRoot(finalizedBlock, fRoot)
-	if err != nil {
-		return err
-	}
-	if err := s.cfg.ForkChoiceStore.InsertNode(s.ctx, st, roblock); err != nil {
+	if err := s.cfg.ForkChoiceStore.InsertNode(s.ctx, st, fRoot); err != nil {
 		return errors.Wrap(err, "could not insert finalized block to forkchoice")
 	}
 	if !features.Get().EnableStartOptimistic {
@@ -342,6 +329,8 @@ func (s *Service) StartFromSavedState(saved state.BeaconState) error {
 		return errors.Wrap(err, "failed to initialize blockchain service")
 	}

+	saved.SaveValidatorIndices() // used to handle Validator index invariant from EIP6110
+
 	return nil
 }

@@ -528,11 +517,7 @@ func (s *Service) saveGenesisData(ctx context.Context, genesisState state.Beacon

 	s.cfg.ForkChoiceStore.Lock()
 	defer s.cfg.ForkChoiceStore.Unlock()
-	gb, err := consensus_blocks.NewROBlockWithRoot(genesisBlk, genesisBlkRoot)
-	if err != nil {
-		return err
-	}
-	if err := s.cfg.ForkChoiceStore.InsertNode(ctx, genesisState, gb); err != nil {
+	if err := s.cfg.ForkChoiceStore.InsertNode(ctx, genesisState, genesisBlkRoot); err != nil {
 		log.WithError(err).Fatal("Could not process genesis block for fork choice")
 	}
 	s.cfg.ForkChoiceStore.SetOriginRoot(genesisBlkRoot)
@@ -559,7 +544,7 @@ func (s *Service) saveGenesisData(ctx context.Context, genesisState state.Beacon
 // 2.) Check DB.
 // Checking 1.) is ten times faster than checking 2.)
 // this function requires a lock in forkchoice
-func (s *Service) chainHasBlock(ctx context.Context, root [32]byte) bool {
+func (s *Service) hasBlock(ctx context.Context, root [32]byte) bool {
 	if s.cfg.ForkChoiceStore.HasNode(root) {
 		return true
 	}
--- a/beacon-chain/blockchain/service_test.go
+++ b/beacon-chain/blockchain/service_test.go
@@ -376,18 +376,14 @@ func TestHasBlock_ForkChoiceAndDB_DoublyLinkedTree(t *testing.T) {
 		cfg: &config{ForkChoiceStore: doublylinkedtree.New(), BeaconDB: beaconDB},
 	}
 	b := util.NewBeaconBlock()
-	wsb, err := consensusblocks.NewSignedBeaconBlock(b)
-	require.NoError(t, err)
 	r, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	roblock, err := consensusblocks.NewROBlockWithRoot(wsb, r)
-	require.NoError(t, err)
 	beaconState, err := util.NewBeaconState()
 	require.NoError(t, err)
-	require.NoError(t, s.cfg.ForkChoiceStore.InsertNode(ctx, beaconState, roblock))
+	require.NoError(t, s.cfg.ForkChoiceStore.InsertNode(ctx, beaconState, r))

-	assert.Equal(t, false, s.chainHasBlock(ctx, [32]byte{}), "Should not have block")
-	assert.Equal(t, true, s.chainHasBlock(ctx, r), "Should have block")
+	assert.Equal(t, false, s.hasBlock(ctx, [32]byte{}), "Should not have block")
+	assert.Equal(t, true, s.hasBlock(ctx, r), "Should have block")
 }

 func TestServiceStop_SaveCachedBlocks(t *testing.T) {
@@ -457,11 +453,7 @@ func BenchmarkHasBlockForkChoiceStore_DoublyLinkedTree(b *testing.B) {
 	require.NoError(b, err)
 	beaconState, err := util.NewBeaconState()
 	require.NoError(b, err)
-	wsb, err := consensusblocks.NewSignedBeaconBlock(blk)
-	require.NoError(b, err)
-	roblock, err := consensusblocks.NewROBlockWithRoot(wsb, r)
-	require.NoError(b, err)
-	require.NoError(b, s.cfg.ForkChoiceStore.InsertNode(ctx, beaconState, roblock))
+	require.NoError(b, s.cfg.ForkChoiceStore.InsertNode(ctx, beaconState, r))

 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
--- a/beacon-chain/blockchain/setup_test.go
+++ b/beacon-chain/blockchain/setup_test.go
@@ -32,7 +32,7 @@ type mockBeaconNode struct {
 }

 // StateFeed mocks the same method in the beacon node.
-func (mbn *mockBeaconNode) StateFeed() event.SubscriberSender {
+func (mbn *mockBeaconNode) StateFeed() *event.Feed {
 	mbn.mu.Lock()
 	defer mbn.mu.Unlock()
 	if mbn.stateFeed == nil {
--- a/beacon-chain/blockchain/testing/BUILD.bazel
+++ b/beacon-chain/blockchain/testing/BUILD.bazel
@@ -3,10 +3,7 @@ load("@prysm//tools/go:def.bzl", "go_library")
 go_library(
    name = "go_default_library",
    testonly = True,
-    srcs = [
-        "mock.go",
-        "mock_epbs.go",
-    ],
+    srcs = ["mock.go"],
    importpath = "github.com/prysmaticlabs/prysm/v5/beacon-chain/blockchain/testing",
    visibility = [
        "//beacon-chain:__subpackages__",
--- a/beacon-chain/blockchain/testing/mock.go
+++ b/beacon-chain/blockchain/testing/mock.go
@@ -37,50 +37,44 @@ var ErrNilState = errors.New("nil state")

 // ChainService defines the mock interface for testing
 type ChainService struct {
-	NotFinalized                        bool
-	Optimistic                          bool
-	ValidAttestation                    bool
-	ValidatorsRoot                      [32]byte
-	PublicKey                           [fieldparams.BLSPubkeyLength]byte
-	FinalizedCheckPoint                 *ethpb.Checkpoint
-	CurrentJustifiedCheckPoint          *ethpb.Checkpoint
-	PreviousJustifiedCheckPoint         *ethpb.Checkpoint
-	Slot                                *primitives.Slot // Pointer because 0 is a useful value, so checking against it can be incorrect.
-	Balance                             *precompute.Balance
-	CanonicalRoots                      map[[32]byte]bool
-	Fork                                *ethpb.Fork
-	ETH1Data                            *ethpb.Eth1Data
-	InitSyncBlockRoots                  map[[32]byte]bool
-	DB                                  db.Database
-	State                               state.BeaconState
-	Block                               interfaces.ReadOnlySignedBeaconBlock
-	ExecutionPayloadEnvelope            interfaces.ROExecutionPayloadEnvelope
-	VerifyBlkDescendantErr              error
-	stateNotifier                       statefeed.Notifier
-	BlocksReceived                      []interfaces.ReadOnlySignedBeaconBlock
-	SyncCommitteeIndices                []primitives.CommitteeIndex
-	blockNotifier                       blockfeed.Notifier
-	opNotifier                          opfeed.Notifier
-	Root                                []byte
-	SyncCommitteeDomain                 []byte
-	SyncSelectionProofDomain            []byte
-	SyncContributionProofDomain         []byte
-	SyncCommitteePubkeys                [][]byte
-	Genesis                             time.Time
-	ForkChoiceStore                     forkchoice.ForkChoicer
-	ReceiveBlockMockErr                 error
-	ReceiveEnvelopeMockErr              error
-	OptimisticCheckRootReceived         [32]byte
-	FinalizedRoots                      map[[32]byte]bool
-	OptimisticRoots                     map[[32]byte]bool
-	BlockSlot                           primitives.Slot
-	SyncingRoot                         [32]byte
-	Blobs                               []blocks.VerifiedROBlob
-	TargetRoot                          [32]byte
-	HighestReceivedSlot                 primitives.Slot
-	HighestReceivedRoot                 [32]byte
-	PayloadStatus                       primitives.PTCStatus
-	ReceivePayloadAttestationMessageErr error
+	NotFinalized                bool
+	Optimistic                  bool
+	ValidAttestation            bool
+	ValidatorsRoot              [32]byte
+	PublicKey                   [fieldparams.BLSPubkeyLength]byte
+	FinalizedCheckPoint         *ethpb.Checkpoint
+	CurrentJustifiedCheckPoint  *ethpb.Checkpoint
+	PreviousJustifiedCheckPoint *ethpb.Checkpoint
+	Slot                        *primitives.Slot // Pointer because 0 is a useful value, so checking against it can be incorrect.
+	Balance                     *precompute.Balance
+	CanonicalRoots              map[[32]byte]bool
+	Fork                        *ethpb.Fork
+	ETH1Data                    *ethpb.Eth1Data
+	InitSyncBlockRoots          map[[32]byte]bool
+	DB                          db.Database
+	State                       state.BeaconState
+	Block                       interfaces.ReadOnlySignedBeaconBlock
+	VerifyBlkDescendantErr      error
+	stateNotifier               statefeed.Notifier
+	BlocksReceived              []interfaces.ReadOnlySignedBeaconBlock
+	SyncCommitteeIndices        []primitives.CommitteeIndex
+	blockNotifier               blockfeed.Notifier
+	opNotifier                  opfeed.Notifier
+	Root                        []byte
+	SyncCommitteeDomain         []byte
+	SyncSelectionProofDomain    []byte
+	SyncContributionProofDomain []byte
+	SyncCommitteePubkeys        [][]byte
+	Genesis                     time.Time
+	ForkChoiceStore             forkchoice.ForkChoicer
+	ReceiveBlockMockErr         error
+	OptimisticCheckRootReceived [32]byte
+	FinalizedRoots              map[[32]byte]bool
+	OptimisticRoots             map[[32]byte]bool
+	BlockSlot                   primitives.Slot
+	SyncingRoot                 [32]byte
+	Blobs                       []blocks.VerifiedROBlob
+	TargetRoot                  [32]byte
 }

 func (s *ChainService) Ancestor(ctx context.Context, root []byte, slot primitives.Slot) ([]byte, error) {
@@ -104,44 +98,6 @@ func (s *ChainService) BlockNotifier() blockfeed.Notifier {
 	return s.blockNotifier
 }

-type EventFeedWrapper struct {
-	feed       *event.Feed
-	subscribed chan struct{} // this channel is closed once a subscription is made
-}
-
-func (w *EventFeedWrapper) Subscribe(channel interface{}) event.Subscription {
-	select {
-	case <-w.subscribed:
-		break // already closed
-	default:
-		close(w.subscribed)
-	}
-	return w.feed.Subscribe(channel)
-}
-
-func (w *EventFeedWrapper) Send(value interface{}) int {
-	return w.feed.Send(value)
-}
-
-// WaitForSubscription allows test to wait for the feed to have a subscription before beginning to send events.
-func (w *EventFeedWrapper) WaitForSubscription(ctx context.Context) error {
-	select {
-	case <-w.subscribed:
-		return nil
-	case <-ctx.Done():
-		return ctx.Err()
-	}
-}
-
-var _ event.SubscriberSender = &EventFeedWrapper{}
-
-func NewEventFeedWrapper() *EventFeedWrapper {
-	return &EventFeedWrapper{
-		feed:       new(event.Feed),
-		subscribed: make(chan struct{}),
-	}
-}
-
 // MockBlockNotifier mocks the block notifier.
 type MockBlockNotifier struct {
 	feed *event.Feed
@@ -175,7 +131,7 @@ func (msn *MockStateNotifier) ReceivedEvents() []*feed.Event {
 }

 // StateFeed returns a state feed.
-func (msn *MockStateNotifier) StateFeed() event.SubscriberSender {
+func (msn *MockStateNotifier) StateFeed() *event.Feed {
 	msn.feedLock.Lock()
 	defer msn.feedLock.Unlock()

@@ -203,23 +159,6 @@ func (msn *MockStateNotifier) StateFeed() event.SubscriberSender {
 	return msn.feed
 }

-// NewSimpleStateNotifier makes a state feed without the custom mock feed machinery.
-func NewSimpleStateNotifier() *MockStateNotifier {
-	return &MockStateNotifier{feed: new(event.Feed)}
-}
-
-type SimpleNotifier struct {
-	Feed event.SubscriberSender
-}
-
-func (n *SimpleNotifier) StateFeed() event.SubscriberSender {
-	return n.Feed
-}
-
-func (n *SimpleNotifier) OperationFeed() event.SubscriberSender {
-	return n.Feed
-}
-
 // OperationNotifier mocks the same method in the chain service.
 func (s *ChainService) OperationNotifier() opfeed.Notifier {
 	if s.opNotifier == nil {
@@ -234,7 +173,7 @@ type MockOperationNotifier struct {
 }

 // OperationFeed returns an operation feed.
-func (mon *MockOperationNotifier) OperationFeed() event.SubscriberSender {
+func (mon *MockOperationNotifier) OperationFeed() *event.Feed {
 	if mon.feed == nil {
 		mon.feed = new(event.Feed)
 	}
@@ -573,7 +512,7 @@ func prepareForkchoiceState(
 	payloadHash [32]byte,
 	justified *ethpb.Checkpoint,
 	finalized *ethpb.Checkpoint,
-) (state.BeaconState, blocks.ROBlock, error) {
+) (state.BeaconState, [32]byte, error) {
 	blockHeader := &ethpb.BeaconBlockHeader{
 		ParentRoot: parentRoot[:],
 	}
@@ -594,26 +533,7 @@ func prepareForkchoiceState(

 	base.BlockRoots[0] = append(base.BlockRoots[0], blockRoot[:]...)
 	st, err := state_native.InitializeFromProtoBellatrix(base)
-	if err != nil {
-		return nil, blocks.ROBlock{}, err
-	}
-	blk := &ethpb.SignedBeaconBlockBellatrix{
-		Block: &ethpb.BeaconBlockBellatrix{
-			Slot:       slot,
-			ParentRoot: parentRoot[:],
-			Body: &ethpb.BeaconBlockBodyBellatrix{
-				ExecutionPayload: &enginev1.ExecutionPayload{
-					BlockHash: payloadHash[:],
-				},
-			},
-		},
-	}
-	signed, err := blocks.NewSignedBeaconBlock(blk)
-	if err != nil {
-		return nil, blocks.ROBlock{}, err
-	}
-	roblock, err := blocks.NewROBlockWithRoot(signed, blockRoot)
-	return st, roblock, err
+	return st, blockRoot, err
 }

 // CachedHeadRoot mocks the same method in the chain service
@@ -647,18 +567,18 @@ func (s *ChainService) ReceivedBlocksLastEpoch() (uint64, error) {
 	return 0, nil
 }

-// HighestReceivedBlockSlotRoot mocks the same method in the chain service
-func (s *ChainService) HighestReceivedBlockSlotRoot() (primitives.Slot, [32]byte) {
+// HighestReceivedBlockSlot mocks the same method in the chain service
+func (s *ChainService) HighestReceivedBlockSlot() primitives.Slot {
 	if s.ForkChoiceStore != nil {
-		return s.ForkChoiceStore.HighestReceivedBlockSlotRoot()
+		return s.ForkChoiceStore.HighestReceivedBlockSlot()
 	}
-	return s.HighestReceivedSlot, s.HighestReceivedRoot
+	return 0
 }

 // InsertNode mocks the same method in the chain service
-func (s *ChainService) InsertNode(ctx context.Context, st state.BeaconState, block blocks.ROBlock) error {
+func (s *ChainService) InsertNode(ctx context.Context, st state.BeaconState, root [32]byte) error {
 	if s.ForkChoiceStore != nil {
-		return s.ForkChoiceStore.InsertNode(ctx, st, block)
+		return s.ForkChoiceStore.InsertNode(ctx, st, root)
 	}
 	return nil
 }
@@ -708,21 +628,12 @@ func (c *ChainService) ReceiveBlob(_ context.Context, b blocks.VerifiedROBlob) e
 	return nil
 }

+// ReceiveDataColumn implements the same method in chain service
+func (c *ChainService) ReceiveDataColumn(_ context.Context, _ *ethpb.DataColumnSidecar) error {
+	return nil
+}
+
 // TargetRootForEpoch mocks the same method in the chain service
 func (c *ChainService) TargetRootForEpoch(_ [32]byte, _ primitives.Epoch) ([32]byte, error) {
 	return c.TargetRoot, nil
 }
-
-// HashInForkchoice mocks the same method in the chain service
-func (c *ChainService) HashInForkchoice([32]byte) bool {
-	return false
-}
-
-// ReceivePayloadAttestationMessage mocks the same method in the chain service
-func (c *ChainService) ReceivePayloadAttestationMessage(_ context.Context, _ *ethpb.PayloadAttestationMessage) error {
-	return c.ReceivePayloadAttestationMessageErr
-}
-
-func (c *ChainService) GetPTCVote(root [32]byte) primitives.PTCStatus {
-	return c.PayloadStatus
-}
--- a/beacon-chain/blockchain/testing/mock_epbs.go
+++ b/beacon-chain/blockchain/testing/mock_epbs.go
@@ -1,25 +0,0 @@
-package testing
-
-import (
-	"context"
-
-	"github.com/prysmaticlabs/prysm/v5/beacon-chain/das"
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
-)
-
-// ReceiveExecutionPayloadEnvelope mocks the  method in chain service.
-func (s *ChainService) ReceiveExecutionPayloadEnvelope(ctx context.Context, env interfaces.ROExecutionPayloadEnvelope, _ das.AvailabilityStore) error {
-	if s.ReceiveBlockMockErr != nil {
-		return s.ReceiveBlockMockErr
-	}
-	if s.State == nil {
-		return ErrNilState
-	}
-	if s.State.Slot() == env.Slot() {
-		if err := s.State.SetLatestFullSlot(s.State.Slot()); err != nil {
-			return err
-		}
-	}
-	s.ExecutionPayloadEnvelope = env
-	return nil
-}
--- a/beacon-chain/builder/BUILD.bazel
+++ b/beacon-chain/builder/BUILD.bazel
@@ -19,7 +19,6 @@ go_library(
        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//monitoring/tracing:go_default_library",
-        "//monitoring/tracing/trace:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
@@ -27,6 +26,7 @@ go_library(
        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@com_github_urfave_cli_v2//:go_default_library",
+        "@io_opencensus_go//trace:go_default_library",
    ],
 )

--- a/beacon-chain/builder/service.go
+++ b/beacon-chain/builder/service.go
@@ -14,10 +14,10 @@ import (
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	v1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	log "github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 // ErrNoBuilder is used when builder endpoint is not configured.
--- a/beacon-chain/cache/BUILD.bazel
+++ b/beacon-chain/cache/BUILD.bazel
@@ -8,6 +8,7 @@ go_library(
        "attestation_data.go",
        "balance_cache_key.go",
        "checkpoint_state.go",
+        "column_subnet_ids.go",
        "committee.go",
        "committee_disabled.go",  # keep
        "committees.go",
@@ -15,13 +16,11 @@ go_library(
        "doc.go",
        "error.go",
        "interfaces.go",
-        "payload_attestation.go",
        "payload_id.go",
        "proposer_indices.go",
        "proposer_indices_disabled.go",  # keep
        "proposer_indices_type.go",
        "registration.go",
-        "signed_execution_header.go",
        "skip_slot_cache.go",
        "subnet_ids.go",
        "sync_committee.go",
@@ -44,13 +43,10 @@ go_library(
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
        "//container/slice:go_default_library",
-        "//crypto/bls:go_default_library",
        "//crypto/hash:go_default_library",
        "//crypto/rand:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//math:go_default_library",
-        "//monitoring/tracing/trace:go_default_library",
-        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//runtime/version:go_default_library",
        "@com_github_ethereum_go_ethereum//common:go_default_library",
@@ -61,6 +57,7 @@ go_library(
        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@io_k8s_client_go//tools/cache:go_default_library",
+        "@io_opencensus_go//trace:go_default_library",
    ],
 )

@@ -74,12 +71,10 @@ go_test(
        "checkpoint_state_test.go",
        "committee_fuzz_test.go",
        "committee_test.go",
-        "payload_attestation_test.go",
        "payload_id_test.go",
        "private_access_test.go",
        "proposer_indices_test.go",
        "registration_test.go",
-        "signed_execution_header_test.go",
        "skip_slot_cache_test.go",
        "subnet_ids_test.go",
        "sync_committee_head_state_test.go",
@@ -94,9 +89,7 @@ go_test(
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
        "//consensus-types/primitives:go_default_library",
-        "//crypto/bls:go_default_library",
        "//encoding/bytesutil:go_default_library",
-        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
--- a/beacon-chain/cache/column_subnet_ids.go
+++ b/beacon-chain/cache/column_subnet_ids.go
@@ -0,0 +1,65 @@
+package cache
+
+import (
+	"sync"
+	"time"
+
+	"github.com/patrickmn/go-cache"
+	"github.com/prysmaticlabs/prysm/v5/config/params"
+)
+
+type columnSubnetIDs struct {
+	colSubCache *cache.Cache
+	colSubLock  sync.RWMutex
+}
+
+// ColumnSubnetIDs for column subnet participants
+var ColumnSubnetIDs = newColumnSubnetIDs()
+
+const columnKey = "columns"
+
+func newColumnSubnetIDs() *columnSubnetIDs {
+	epochDuration := time.Duration(params.BeaconConfig().SlotsPerEpoch.Mul(params.BeaconConfig().SecondsPerSlot))
+	// Set the default duration of a column subnet subscription as the column expiry period.
+	subLength := epochDuration * time.Duration(params.BeaconConfig().MinEpochsForDataColumnSidecarsRequest)
+	persistentCache := cache.New(subLength*time.Second, epochDuration*time.Second)
+	return &columnSubnetIDs{colSubCache: persistentCache}
+}
+
+// GetColumnSubnets retrieves the data column subnets.
+func (s *columnSubnetIDs) GetColumnSubnets() ([]uint64, bool, time.Time) {
+	s.colSubLock.RLock()
+	defer s.colSubLock.RUnlock()
+
+	id, duration, ok := s.colSubCache.GetWithExpiration(columnKey)
+	if !ok {
+		return nil, false, time.Time{}
+	}
+	// Retrieve indices from the cache.
+	idxs, ok := id.([]uint64)
+	if !ok {
+		return nil, false, time.Time{}
+	}
+
+	return idxs, ok, duration
+}
+
+// AddColumnSubnets adds the relevant data column subnets.
+func (s *columnSubnetIDs) AddColumnSubnets(colIdx []uint64) {
+	s.colSubLock.Lock()
+	defer s.colSubLock.Unlock()
+
+	s.colSubCache.Set(columnKey, colIdx, 0)
+}
+
+// EmptyAllCaches empties out all the related caches and flushes any stored
+// entries on them. This should only ever be used for testing, in normal
+// production, handling of the relevant subnets for each role is done
+// separately.
+func (s *columnSubnetIDs) EmptyAllCaches() {
+	// Clear the cache.
+	s.colSubLock.Lock()
+	defer s.colSubLock.Unlock()
+
+	s.colSubCache.Flush()
+}
--- a/beacon-chain/cache/common.go
+++ b/beacon-chain/cache/common.go
@@ -17,6 +17,6 @@ func trim(queue *cache.FIFO, maxSize uint64) {
 }

 // popProcessNoopFunc is a no-op function that never returns an error.
-func popProcessNoopFunc(_ interface{}, _ bool) error {
+func popProcessNoopFunc(_ interface{}) error {
 	return nil
 }
--- a/beacon-chain/cache/depositsnapshot/BUILD.bazel
+++ b/beacon-chain/cache/depositsnapshot/BUILD.bazel
@@ -19,7 +19,6 @@ go_library(
        "//crypto/hash:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//math:go_default_library",
-        "//monitoring/tracing/trace:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "@com_github_ethereum_go_ethereum//common:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
@@ -27,6 +26,7 @@ go_library(
        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@com_github_wealdtech_go_bytesutil//:go_default_library",
+        "@io_opencensus_go//trace:go_default_library",
    ],
 )

--- a/beacon-chain/cache/depositsnapshot/deposit_fetcher.go
+++ b/beacon-chain/cache/depositsnapshot/deposit_fetcher.go
@@ -10,10 +10,10 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/cache"
 	fieldparams "github.com/prysmaticlabs/prysm/v5/config/fieldparams"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/sirupsen/logrus"
 	"github.com/wealdtech/go-bytesutil"
+	"go.opencensus.io/trace"
 )

 var (
@@ -241,7 +241,7 @@ func (c *Cache) InsertPendingDeposit(ctx context.Context, d *ethpb.Deposit, bloc
 	c.pendingDeposits = append(c.pendingDeposits,
 		&ethpb.DepositContainer{Deposit: d, Eth1BlockHeight: blockNum, Index: index, DepositRoot: depositRoot[:]})
 	pendingDepositsCount.Set(float64(len(c.pendingDeposits)))
-	span.SetAttributes(trace.Int64Attribute("count", int64(len(c.pendingDeposits))))
+	span.AddAttributes(trace.Int64Attribute("count", int64(len(c.pendingDeposits))))
 }

 // Deposits returns the cached internal deposit tree.
@@ -304,7 +304,7 @@ func (c *Cache) PendingContainers(ctx context.Context, untilBlk *big.Int) []*eth
 		return depositCntrs[i].Index < depositCntrs[j].Index
 	})

-	span.SetAttributes(trace.Int64Attribute("count", int64(len(depositCntrs))))
+	span.AddAttributes(trace.Int64Attribute("count", int64(len(depositCntrs))))

 	return depositCntrs
 }
--- a/beacon-chain/cache/depositsnapshot/deposit_inserter.go
+++ b/beacon-chain/cache/depositsnapshot/deposit_inserter.go
@@ -10,9 +10,9 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
 )

 var (
--- a/beacon-chain/cache/payload_attestation.go
+++ b/beacon-chain/cache/payload_attestation.go
@@ -1,132 +0,0 @@
-package cache
-
-import (
-	"errors"
-	"sync"
-
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/crypto/bls"
-	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	eth "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
-)
-
-var errNilPayloadAttestationMessage = errors.New("nil Payload Attestation Message")
-
-// PayloadAttestationCache keeps a map of all the PTC votes that were seen,
-// already aggregated. The key is the beacon block root.
-type PayloadAttestationCache struct {
-	root         [32]byte
-	attestations [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation
-	sync.Mutex
-}
-
-// Seen returns true if a vote for the given Beacon Block Root has already been processed
-// for this Payload Timeliness Committee index. This will return true even if
-// the Payload status differs.
-func (p *PayloadAttestationCache) Seen(root [32]byte, idx uint64) bool {
-	p.Lock()
-	defer p.Unlock()
-	if p.root != root {
-		return false
-	}
-	for _, agg := range p.attestations {
-		if agg == nil {
-			continue
-		}
-		if agg.AggregationBits.BitAt(idx) {
-			return true
-		}
-	}
-	return false
-}
-
-// messageToPayloadAttestation creates a PayloadAttestation with a single
-// aggregated bit from the passed PayloadAttestationMessage
-func messageToPayloadAttestation(att *eth.PayloadAttestationMessage, idx uint64) *eth.PayloadAttestation {
-	bits := primitives.NewPayloadAttestationAggregationBits()
-	bits.SetBitAt(idx, true)
-	data := &eth.PayloadAttestationData{
-		BeaconBlockRoot: bytesutil.SafeCopyBytes(att.Data.BeaconBlockRoot),
-		Slot:            att.Data.Slot,
-		PayloadStatus:   att.Data.PayloadStatus,
-	}
-	return &eth.PayloadAttestation{
-		AggregationBits: bits,
-		Data:            data,
-		Signature:       bytesutil.SafeCopyBytes(att.Signature),
-	}
-}
-
-// aggregateSigFromMessage returns the aggregated signature from a Payload
-// Attestation by adding the passed signature in the PayloadAttestationMessage,
-// no signature validation is performed.
-func aggregateSigFromMessage(aggregated *eth.PayloadAttestation, message *eth.PayloadAttestationMessage) ([]byte, error) {
-	aggSig, err := bls.SignatureFromBytesNoValidation(aggregated.Signature)
-	if err != nil {
-		return nil, err
-	}
-	sig, err := bls.SignatureFromBytesNoValidation(message.Signature)
-	if err != nil {
-		return nil, err
-	}
-	return bls.AggregateSignatures([]bls.Signature{aggSig, sig}).Marshal(), nil
-}
-
-// Add adds a PayloadAttestationMessage to the internal cache of aggregated
-// PayloadAttestations.
-// If the index has already been seen for this attestation status the function does nothing.
-// If the root is not the cached root, the function will clear the previous cache
-// This function assumes that the message has already been validated. In
-// particular that the signature is valid and that the block root corresponds to
-// the given slot in the attestation data.
-func (p *PayloadAttestationCache) Add(att *eth.PayloadAttestationMessage, idx uint64) error {
-	if att == nil || att.Data == nil || att.Data.BeaconBlockRoot == nil {
-		return errNilPayloadAttestationMessage
-	}
-	p.Lock()
-	defer p.Unlock()
-	root := [32]byte(att.Data.BeaconBlockRoot)
-	if p.root != root {
-		p.root = root
-		p.attestations = [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation{}
-	}
-	agg := p.attestations[att.Data.PayloadStatus]
-	if agg == nil {
-		p.attestations[att.Data.PayloadStatus] = messageToPayloadAttestation(att, idx)
-		return nil
-	}
-	if agg.AggregationBits.BitAt(idx) {
-		return nil
-	}
-	sig, err := aggregateSigFromMessage(agg, att)
-	if err != nil {
-		return err
-	}
-	agg.Signature = sig
-	agg.AggregationBits.SetBitAt(idx, true)
-	return nil
-}
-
-// Get returns the aggregated PayloadAttestation for the given root and status
-// if the root doesn't exist or status is invalid, the function returns nil.
-func (p *PayloadAttestationCache) Get(root [32]byte, status primitives.PTCStatus) *eth.PayloadAttestation {
-	p.Lock()
-	defer p.Unlock()
-
-	if p.root != root {
-		return nil
-	}
-	if status >= primitives.PAYLOAD_INVALID_STATUS {
-		return nil
-	}
-
-	return eth.CopyPayloadAttestation(p.attestations[status])
-}
-
-// Clear clears the internal map
-func (p *PayloadAttestationCache) Clear() {
-	p.Lock()
-	defer p.Unlock()
-	p.root = [32]byte{}
-	p.attestations = [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation{}
-}
--- a/beacon-chain/cache/payload_attestation_test.go
+++ b/beacon-chain/cache/payload_attestation_test.go
@@ -1,143 +0,0 @@
-package cache
-
-import (
-	"testing"
-
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/v5/crypto/bls"
-	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	eth "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/v5/testing/require"
-)
-
-func TestPayloadAttestationCache(t *testing.T) {
-	p := &PayloadAttestationCache{}
-
-	//Test Has seen
-	root := [32]byte{'r'}
-	idx := uint64(5)
-	require.Equal(t, false, p.Seen(root, idx))
-
-	// Test Add
-	msg := &eth.PayloadAttestationMessage{
-		Signature: bls.NewAggregateSignature().Marshal(),
-		Data: &eth.PayloadAttestationData{
-			BeaconBlockRoot: root[:],
-			Slot:            1,
-			PayloadStatus:   primitives.PAYLOAD_PRESENT,
-		},
-	}
-
-	// Add new root
-	require.NoError(t, p.Add(msg, idx))
-	require.Equal(t, true, p.Seen(root, idx))
-	require.Equal(t, root, p.root)
-	att := p.attestations[primitives.PAYLOAD_PRESENT]
-	indices := att.AggregationBits.BitIndices()
-	require.DeepEqual(t, []int{int(idx)}, indices)
-	singleSig := bytesutil.SafeCopyBytes(msg.Signature)
-	require.DeepEqual(t, singleSig, att.Signature)
-
-	// Test Seen
-	require.Equal(t, true, p.Seen(root, idx))
-	require.Equal(t, false, p.Seen(root, idx+1))
-
-	// Add another attestation on the same data
-	msg2 := &eth.PayloadAttestationMessage{
-		Signature: bls.NewAggregateSignature().Marshal(),
-		Data:      att.Data,
-	}
-	idx2 := uint64(7)
-	require.NoError(t, p.Add(msg2, idx2))
-	att = p.attestations[primitives.PAYLOAD_PRESENT]
-	indices = att.AggregationBits.BitIndices()
-	require.DeepEqual(t, []int{int(idx), int(idx2)}, indices)
-	require.DeepNotEqual(t, att.Signature, msg.Signature)
-
-	// Try again the same index
-	require.NoError(t, p.Add(msg2, idx2))
-	att2 := p.attestations[primitives.PAYLOAD_PRESENT]
-	indices = att.AggregationBits.BitIndices()
-	require.DeepEqual(t, []int{int(idx), int(idx2)}, indices)
-	require.DeepEqual(t, att, att2)
-
-	// Test Seen
-	require.Equal(t, true, p.Seen(root, idx2))
-	require.Equal(t, false, p.Seen(root, idx2+1))
-
-	// Add another payload status for a different payload status
-	msg3 := &eth.PayloadAttestationMessage{
-		Signature: bls.NewAggregateSignature().Marshal(),
-		Data: &eth.PayloadAttestationData{
-			BeaconBlockRoot: root[:],
-			Slot:            1,
-			PayloadStatus:   primitives.PAYLOAD_WITHHELD,
-		},
-	}
-	idx3 := uint64(17)
-
-	require.NoError(t, p.Add(msg3, idx3))
-	att3 := p.attestations[primitives.PAYLOAD_WITHHELD]
-	indices3 := att3.AggregationBits.BitIndices()
-	require.DeepEqual(t, []int{int(idx3)}, indices3)
-	require.DeepEqual(t, singleSig, att3.Signature)
-
-	// Add a different root
-	root2 := [32]byte{'s'}
-	msg.Data.BeaconBlockRoot = root2[:]
-	require.NoError(t, p.Add(msg, idx))
-	require.Equal(t, root2, p.root)
-	require.Equal(t, true, p.Seen(root2, idx))
-	require.Equal(t, false, p.Seen(root, idx))
-	att = p.attestations[primitives.PAYLOAD_PRESENT]
-	indices = att.AggregationBits.BitIndices()
-	require.DeepEqual(t, []int{int(idx)}, indices)
-}
-
-func TestPayloadAttestationCache_Get(t *testing.T) {
-	root := [32]byte{1, 2, 3}
-	wrongRoot := [32]byte{4, 5, 6}
-	status := primitives.PAYLOAD_PRESENT
-	invalidStatus := primitives.PAYLOAD_INVALID_STATUS
-
-	cache := &PayloadAttestationCache{
-		root: root,
-		attestations: [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation{
-			{
-				Signature: []byte{1},
-			},
-			{
-				Signature: []byte{2},
-			},
-			{
-				Signature: []byte{3},
-			},
-		},
-	}
-
-	t.Run("valid root and status", func(t *testing.T) {
-		result := cache.Get(root, status)
-		require.NotNil(t, result, "Expected a non-nil result")
-		require.DeepEqual(t, cache.attestations[status], result)
-	})
-
-	t.Run("invalid root", func(t *testing.T) {
-		result := cache.Get(wrongRoot, status)
-		require.IsNil(t, result)
-	})
-
-	t.Run("status out of bound", func(t *testing.T) {
-		result := cache.Get(root, invalidStatus)
-		require.IsNil(t, result)
-	})
-
-	t.Run("no attestation", func(t *testing.T) {
-		emptyCache := &PayloadAttestationCache{
-			root:         root,
-			attestations: [primitives.PAYLOAD_INVALID_STATUS]*eth.PayloadAttestation{},
-		}
-
-		result := emptyCache.Get(root, status)
-		require.IsNil(t, result)
-	})
-}
--- a/beacon-chain/cache/registration.go
+++ b/beacon-chain/cache/registration.go
@@ -7,8 +7,8 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
+	"go.opencensus.io/trace"
 )

 // RegistrationCache is used to store the cached results of an Validator Registration request.
--- a/beacon-chain/cache/signed_execution_header.go
+++ b/beacon-chain/cache/signed_execution_header.go
@@ -1,76 +0,0 @@
-package cache
-
-import (
-	"bytes"
-	"sync"
-
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
-	enginev1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
-)
-
-// ExecutionPayloadHeaders is used  by the sync service to store signed execution payload headers after they pass validation,
-// and filter out subsequent headers with lower value.
-// The signed header from this cache could be used by the proposer when proposing the next slot.
-type ExecutionPayloadHeaders struct {
-	headers map[primitives.Slot][]*enginev1.SignedExecutionPayloadHeader
-	sync.RWMutex
-}
-
-func NewExecutionPayloadHeaders() *ExecutionPayloadHeaders {
-	return &ExecutionPayloadHeaders{
-		headers: make(map[primitives.Slot][]*enginev1.SignedExecutionPayloadHeader),
-	}
-}
-
-// SaveSignedExecutionPayloadHeader saves the signed execution payload header to the cache.
-// The cache stores headers for up to two slots. If the input slot is higher than the lowest slot
-// currently in the cache, the lowest slot is removed to make space for the new header.
-// Only the highest value header for a given parent block hash will be stored.
-// This function assumes caller already checks header's slot is current or next slot, it doesn't account for slot validation.
-func (c *ExecutionPayloadHeaders) SaveSignedExecutionPayloadHeader(header *enginev1.SignedExecutionPayloadHeader) {
-	c.Lock()
-	defer c.Unlock()
-
-	for s := range c.headers {
-		if s+1 < header.Message.Slot {
-			delete(c.headers, s)
-		}
-	}
-
-	// Add or update the header in the map
-	if _, ok := c.headers[header.Message.Slot]; !ok {
-		c.headers[header.Message.Slot] = []*enginev1.SignedExecutionPayloadHeader{header}
-	} else {
-		found := false
-		for i, h := range c.headers[header.Message.Slot] {
-			if bytes.Equal(h.Message.ParentBlockHash, header.Message.ParentBlockHash) && bytes.Equal(h.Message.ParentBlockRoot, header.Message.ParentBlockRoot) {
-				if header.Message.Value > h.Message.Value {
-					c.headers[header.Message.Slot][i] = header
-				}
-				found = true
-				break
-			}
-		}
-		if !found {
-			c.headers[header.Message.Slot] = append(c.headers[header.Message.Slot], header)
-		}
-	}
-}
-
-// SignedExecutionPayloadHeader returns the signed payload header for the given slot and parent block hash and block root.
-// Returns nil if the header is not found.
-// This should be used when the caller wants the header to match parent block hash and parent block root such as proposer choosing a header to propose.
-func (c *ExecutionPayloadHeaders) SignedExecutionPayloadHeader(slot primitives.Slot, parentBlockHash []byte, parentBlockRoot []byte) *enginev1.SignedExecutionPayloadHeader {
-	c.RLock()
-	defer c.RUnlock()
-
-	if headers, ok := c.headers[slot]; ok {
-		for _, header := range headers {
-			if bytes.Equal(header.Message.ParentBlockHash, parentBlockHash) && bytes.Equal(header.Message.ParentBlockRoot, parentBlockRoot) {
-				return header
-			}
-		}
-	}
-
-	return nil
-}
--- a/beacon-chain/cache/signed_execution_header_test.go
+++ b/beacon-chain/cache/signed_execution_header_test.go
@@ -1,243 +0,0 @@
-package cache
-
-import (
-	"testing"
-
-	enginev1 "github.com/prysmaticlabs/prysm/v5/proto/engine/v1"
-	"github.com/prysmaticlabs/prysm/v5/testing/require"
-)
-
-func Test_SaveSignedExecutionPayloadHeader(t *testing.T) {
-	t.Run("First header should be added to cache", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            1,
-				ParentBlockHash: []byte("parent1"),
-				Value:           100,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header)
-		require.Equal(t, 1, len(c.headers))
-		require.Equal(t, header, c.headers[1][0])
-	})
-
-	t.Run("Second header with higher slot should be added, and both slots should be in cache", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header1 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            1,
-				ParentBlockHash: []byte("parent1"),
-				Value:           100,
-			},
-		}
-		header2 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            2,
-				ParentBlockHash: []byte("parent2"),
-				Value:           100,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header1)
-		c.SaveSignedExecutionPayloadHeader(header2)
-		require.Equal(t, 2, len(c.headers))
-		require.Equal(t, header1, c.headers[1][0])
-		require.Equal(t, header2, c.headers[2][0])
-	})
-
-	t.Run("Third header with higher slot should replace the oldest slot", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header1 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            1,
-				ParentBlockHash: []byte("parent1"),
-				Value:           100,
-			},
-		}
-		header2 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            2,
-				ParentBlockHash: []byte("parent2"),
-				Value:           100,
-			},
-		}
-		header3 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            3,
-				ParentBlockHash: []byte("parent3"),
-				Value:           100,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header1)
-		c.SaveSignedExecutionPayloadHeader(header2)
-		c.SaveSignedExecutionPayloadHeader(header3)
-		require.Equal(t, 2, len(c.headers))
-		require.Equal(t, header2, c.headers[2][0])
-		require.Equal(t, header3, c.headers[3][0])
-	})
-
-	t.Run("Header with same slot but higher value should replace the existing one", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header1 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            2,
-				ParentBlockHash: []byte("parent2"),
-				Value:           100,
-			},
-		}
-		header2 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            2,
-				ParentBlockHash: []byte("parent2"),
-				Value:           200,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header1)
-		c.SaveSignedExecutionPayloadHeader(header2)
-		require.Equal(t, 1, len(c.headers[2]))
-		require.Equal(t, header2, c.headers[2][0])
-	})
-
-	t.Run("Header with different parent block hash should be appended to the same slot", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header1 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            2,
-				ParentBlockHash: []byte("parent1"),
-				Value:           100,
-			},
-		}
-		header2 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            2,
-				ParentBlockHash: []byte("parent2"),
-				Value:           200,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header1)
-		c.SaveSignedExecutionPayloadHeader(header2)
-		require.Equal(t, 2, len(c.headers[2]))
-		require.Equal(t, header1, c.headers[2][0])
-		require.Equal(t, header2, c.headers[2][1])
-	})
-}
-
-func TestSignedExecutionPayloadHeader(t *testing.T) {
-	t.Run("Return header when slot and parentBlockHash match", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            1,
-				ParentBlockHash: []byte("parent1"),
-				ParentBlockRoot: []byte("root1"),
-				Value:           100,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header)
-		result := c.SignedExecutionPayloadHeader(1, []byte("parent1"), []byte("root1"))
-		require.NotNil(t, result)
-		require.Equal(t, header, result)
-	})
-
-	t.Run("Return nil when no matching slot and parentBlockHash", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            1,
-				ParentBlockHash: []byte("parent1"),
-				ParentBlockRoot: []byte("root1"),
-				Value:           100,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header)
-		result := c.SignedExecutionPayloadHeader(2, []byte("parent2"), []byte("root1"))
-		require.IsNil(t, result)
-	})
-
-	t.Run("Return nil when no matching slot and parentBlockRoot", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            1,
-				ParentBlockHash: []byte("parent1"),
-				ParentBlockRoot: []byte("root1"),
-				Value:           100,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header)
-		result := c.SignedExecutionPayloadHeader(2, []byte("parent1"), []byte("root2"))
-		require.IsNil(t, result)
-	})
-
-	t.Run("Return header when there are two slots in the cache and a match is found", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header1 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            1,
-				ParentBlockHash: []byte("parent1"),
-				Value:           100,
-			},
-		}
-		header2 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            2,
-				ParentBlockHash: []byte("parent2"),
-				Value:           200,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header1)
-		c.SaveSignedExecutionPayloadHeader(header2)
-
-		// Check for the first header
-		result1 := c.SignedExecutionPayloadHeader(1, []byte("parent1"), []byte{})
-		require.NotNil(t, result1)
-		require.Equal(t, header1, result1)
-
-		// Check for the second header
-		result2 := c.SignedExecutionPayloadHeader(2, []byte("parent2"), []byte{})
-		require.NotNil(t, result2)
-		require.Equal(t, header2, result2)
-	})
-
-	t.Run("Return nil when slot is evicted from cache", func(t *testing.T) {
-		c := NewExecutionPayloadHeaders()
-		header1 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            1,
-				ParentBlockHash: []byte("parent1"),
-				Value:           100,
-			},
-		}
-		header2 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            2,
-				ParentBlockHash: []byte("parent2"),
-				Value:           200,
-			},
-		}
-		header3 := &enginev1.SignedExecutionPayloadHeader{
-			Message: &enginev1.ExecutionPayloadHeaderEPBS{
-				Slot:            3,
-				ParentBlockHash: []byte("parent3"),
-				Value:           300,
-			},
-		}
-		c.SaveSignedExecutionPayloadHeader(header1)
-		c.SaveSignedExecutionPayloadHeader(header2)
-		c.SaveSignedExecutionPayloadHeader(header3)
-
-		// The first slot should be evicted, so result should be nil
-		result := c.SignedExecutionPayloadHeader(1, []byte("parent1"), []byte{})
-		require.IsNil(t, result)
-
-		// The second slot should still be present
-		result = c.SignedExecutionPayloadHeader(2, []byte("parent2"), []byte{})
-		require.NotNil(t, result)
-		require.Equal(t, header2, result)
-
-		// The third slot should be present
-		result = c.SignedExecutionPayloadHeader(3, []byte("parent3"), []byte{})
-		require.NotNil(t, result)
-		require.Equal(t, header3, result)
-	})
-}
--- a/beacon-chain/cache/skip_slot_cache.go
+++ b/beacon-chain/cache/skip_slot_cache.go
@@ -11,7 +11,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
 	lruwrpr "github.com/prysmaticlabs/prysm/v5/cache/lru"
-	"github.com/prysmaticlabs/prysm/v5/monitoring/tracing/trace"
+	"go.opencensus.io/trace"
 )

 var (
@@ -92,17 +92,17 @@ func (c *SkipSlotCache) Get(ctx context.Context, r [32]byte) (state.BeaconState,
 		delay *= delayFactor
 		delay = math.Min(delay, maxDelay)
 	}
-	span.SetAttributes(trace.BoolAttribute("inProgress", inProgress))
+	span.AddAttributes(trace.BoolAttribute("inProgress", inProgress))

 	item, exists := c.cache.Get(r)

 	if exists && item != nil {
 		skipSlotCacheHit.Inc()
-		span.SetAttributes(trace.BoolAttribute("hit", true))
+		span.AddAttributes(trace.BoolAttribute("hit", true))
 		return item.(state.BeaconState).Copy(), nil
 	}
 	skipSlotCacheMiss.Inc()
-	span.SetAttributes(trace.BoolAttribute("hit", false))
+	span.AddAttributes(trace.BoolAttribute("hit", false))
 	return nil, nil
 }

--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Manu NALEPA	23d7f87cef	Peer das core (#13877 ) * Bump `c-kzg-4844` lib to the `das` branch. * Implement `MerkleProofKZGCommitments`. * Implement `das-core.md`. * Use `peerdas.CustodyColumnSubnets` and `peerdas.CustodyColumns`. * `CustodyColumnSubnets`: Include `i` in the for loop. * Remove `computeSubscribedColumnSubnet`. * Remove `peerdas.CustodyColumns` out of the for loop.	2024-07-29 13:19:42 +02:00
Nishant Das	a4db00d7ef	Add Request And Response RPC Methods For Data Columns (#13909 ) * Add RPC Handler * Add Column Requests * Update beacon-chain/db/filesystem/blob.go Co-authored-by: Manu NALEPA <enalepa@offchainlabs.com> * Update beacon-chain/p2p/rpc_topic_mappings.go Co-authored-by: Manu NALEPA <enalepa@offchainlabs.com> * Manu's Review * Manu's Review * Interface Fixes * mock manager --------- Co-authored-by: Manu NALEPA <enalepa@offchainlabs.com>	2024-07-29 13:19:42 +02:00
Nishant Das	b6a4e1213c	Add Data Column Gossip Handlers (#13894 ) * Add Data Column Subscriber * Add Data Column Vaidator * Wire all Handlers In * Fix Build * Fix Test * Fix IP in Test * Fix IP in Test	2024-07-29 13:19:42 +02:00
Nishant Das	86088d9c85	Add Support For Discovery Of Column Subnets (#13883 ) * Add Support For Discovery Of Column Subnets * Lint for SubnetsPerNode * Manu's Review * Change to a better name	2024-07-29 13:19:42 +02:00
Nishant Das	e10e610589	add in networking params (#13866 )	2024-07-29 13:19:42 +02:00
Nishant Das	e16a25b6cc	add it (#13865 )	2024-07-29 13:19:42 +02:00
Manu NALEPA	f129dfdee6	Add in column sidecars protos (#13862 )	2024-07-29 13:18:55 +02:00