add everything

add important skip slot check
2026-01-10 22:07:59 -05:00 · 2022-03-29 22:48:06 +08:00 · 2022-03-29 22:39:05 +08:00
1138 changed files with 14421 additions and 29940 deletions
--- a/.github/actions/gomodtidy/entrypoint.sh
+++ b/.github/actions/gomodtidy/entrypoint.sh
@@ -1,8 +1,8 @@
 #!/bin/sh -l
 set -e
-export PATH="$PATH:/usr/local/go/bin"
+export PATH=$PATH:/usr/local/go/bin

-cd "$GITHUB_WORKSPACE"
+cd $GITHUB_WORKSPACE

 cp go.mod go.mod.orig
 cp go.sum go.sum.orig
--- a/.github/workflows/dappnode-release-trigger.yml
+++ b/.github/workflows/dappnode-release-trigger.yml
@@ -0,0 +1,41 @@
+name: Update DAppNodePackages
+
+on:
+  push:
+    tags:
+    - '*'
+
+jobs:
+  dappnode-update-beacon-chain:
+    name: Trigger a beacon-chain release
+    runs-on: ubuntu-latest
+    steps:
+    - name: Get latest tag
+      id: get_tag
+      run: echo ::set-output name=TAG::${GITHUB_REF/refs\/tags\//}
+    - name: Send dispatch event to DAppNodePackage-prysm-beacon-chain
+      env: 
+        DISPATCH_REPO: dappnode/DAppNodePackage-prysm-beacon-chain
+      run: |
+        curl -v -X POST -u "${{ secrets.PAT_GITHUB }}" \
+        -H "Accept: application/vnd.github.everest-preview+json" \
+        -H "Content-Type: application/json" \
+        --data '{"event_type":"new_release", "client_payload": { "tag":"${{ steps.get_tag.outputs.TAG }}"}}' \
+        https://api.github.com/repos/$DISPATCH_REPO/dispatches
+        
+  dappnode-update-validator:
+    name: Trigger a validator release
+    runs-on: ubuntu-latest
+    steps:
+    - name: Get latest tag
+      id: get_tag
+      run: echo ::set-output name=TAG::${GITHUB_REF/refs\/tags\//}
+    - name: Send dispatch event to DAppNodePackage validator repository
+      env: 
+        DISPATCH_REPO: dappnode/DAppNodePackage-prysm-validator
+      run: |
+        curl -v -X POST -u "${{ secrets.PAT_GITHUB }}" \
+        -H "Accept: application/vnd.github.everest-preview+json" \
+        -H "Content-Type: application/json" \
+        --data '{"event_type":"new_release", "client_payload": { "tag":"${{ steps.get_tag.outputs.TAG }}"}}' \
+        https://api.github.com/repos/$DISPATCH_REPO/dispatches
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -7,12 +7,13 @@ on:
    branches: [ '*' ]

 jobs:
-  formatting:
-    name: Formatting
+
+  check:
+    name: Check
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v1

      - name: Go mod tidy checker
        id: gomodtidy
@@ -30,43 +31,15 @@ jobs:
        with:
          goimports-path: ./

-  gosec:
-    name: Gosec scan
-    runs-on: ubuntu-latest
-    env:
-      GO111MODULE: on
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-      - name: Set up Go 1.17
-        uses: actions/setup-go@v3
+      - name: Gosec security scanner
+        uses: securego/gosec@master
        with:
-          go-version: 1.17
-      - name: Run Gosec Security Scanner
-        run: | # https://github.com/securego/gosec/issues/469
-          export PATH=$PATH:$(go env GOPATH)/bin
-          go install github.com/securego/gosec/v2/cmd/gosec@latest
-          gosec -exclude=G307 -exclude-dir=crypto/bls/herumi ./...
-
-  lint:
-    name: Lint
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Set up Go 1.17
-        uses: actions/setup-go@v3
-        with:
-          go-version: 1.17
-          id: go
+          args: '-exclude=G307 -exclude-dir=crypto/bls/herumi ./...'

      - name: Golangci-lint
        uses: golangci/golangci-lint-action@v2
        with:
-          args: --print-issued-lines --sort-results --no-config --timeout=10m --disable-all -E deadcode  -E errcheck -E gosimple --skip-files=validator/web/site_data.go --skip-dirs=proto --go=1.17
-          version: v1.45.2
-          skip-go-installation: true
+          args: --print-issued-lines --sort-results --no-config --timeout=10m --disable-all -E deadcode  -E errcheck -E gosimple --skip-files=validator/web/site_data.go --skip-dirs=proto

  build:
    name: Build
@@ -75,7 +48,7 @@ jobs:
      - name: Set up Go 1.x
        uses: actions/setup-go@v2
        with:
-          go-version: 1.17
+          go-version: ^1.14
        id: go

      - name: Check out code into the Go module directory
@@ -89,11 +62,6 @@ jobs:
        # Use blst tag to allow go and bazel builds for blst.
        run: go build -v ./...

-        # fuzz and blst_disabled leverage go tag based stubs at compile time.
-        # Building with these tags should be checked and enforced at pre-submit.
-      - name: Build for fuzzing
-        run: go build -tags=fuzz,blst_disabled ./... 
-
 # Tests run via Bazel for now...
 #      - name: Test
 #        run: go test -v ./...
--- a/.github/workflows/horusec.yaml
+++ b/.github/workflows/horusec.yaml
@@ -1,22 +0,0 @@
-name: Horusec Security Scan
-
-on:
-  schedule:
-    # Runs cron at 16.00 UTC on
-    - cron: '0 0 * * SUN'
-
-jobs:
-  Horusec_Scan:
-    name: horusec-Scan
-    runs-on: ubuntu-latest
-    if: github.ref == 'refs/heads/develop'
-    steps:
-    - name: Check out code
-      uses: actions/checkout@v2
-      with: # Required when commit authors is enabled
-        fetch-depth: 0
-        
-    - name: Running Security Scan
-      run: |
-        curl -fsSL https://raw.githubusercontent.com/ZupIT/horusec/main/deployments/scripts/install.sh | bash -s latest
-        horusec start -t="10000" -p="./" -e="true" -i="**/crypto/bls/herumi/**, **/**/*_test.go, **/third_party/afl/**, **/crypto/keystore/key.go"
--- a/.gitignore
+++ b/.gitignore
@@ -32,6 +32,3 @@ dist

 # deepsource cli
 bin
-
-# p2p metaData
-metaData
--- a/BUILD.bazel
+++ b/BUILD.bazel
@@ -115,19 +115,18 @@ nogo(
        "@org_golang_x_tools//go/analysis/passes/assign:go_default_library",
        "@org_golang_x_tools//go/analysis/passes/inspect:go_default_library",
        "@org_golang_x_tools//go/analysis/passes/asmdecl:go_default_library",
-        "//tools/analyzers/comparesame:go_default_library",
+        "//tools/analyzers/maligned:go_default_library",
        "//tools/analyzers/cryptorand:go_default_library",
        "//tools/analyzers/errcheck:go_default_library",
        "//tools/analyzers/featureconfig:go_default_library",
-        "//tools/analyzers/gocognit:go_default_library",
-        "//tools/analyzers/ineffassign:go_default_library",
-        "//tools/analyzers/interfacechecker:go_default_library",
-        "//tools/analyzers/maligned:go_default_library",
+        "//tools/analyzers/comparesame:go_default_library",
+        "//tools/analyzers/shadowpredecl:go_default_library",
        "//tools/analyzers/nop:go_default_library",
+        "//tools/analyzers/slicedirect:go_default_library",
+        "//tools/analyzers/interfacechecker:go_default_library",
+        "//tools/analyzers/ineffassign:go_default_library",
        "//tools/analyzers/properpermissions:go_default_library",
        "//tools/analyzers/recursivelock:go_default_library",
-        "//tools/analyzers/shadowpredecl:go_default_library",
-        "//tools/analyzers/slicedirect:go_default_library",
        "//tools/analyzers/uintcast:go_default_library",
    ] + select({
        # nogo checks that fail with coverage enabled.
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@

 [![Build status](https://badge.buildkite.com/b555891daf3614bae4284dcf365b2340cefc0089839526f096.svg?branch=master)](https://buildkite.com/prysmatic-labs/prysm)
 [![Go Report Card](https://goreportcard.com/badge/github.com/prysmaticlabs/prysm)](https://goreportcard.com/report/github.com/prysmaticlabs/prysm)
-[![Consensus_Spec_Version 1.1.10](https://img.shields.io/badge/Consensus%20Spec%20Version-v1.1.10-blue.svg)](https://github.com/ethereum/consensus-specs/tree/v1.1.10)
+[![Consensus_Spec_Version 1.1.8](https://img.shields.io/badge/Consensus%20Spec%20Version-v1.1.8-blue.svg)](https://github.com/ethereum/consensus-specs/tree/v1.1.8)
 [![Discord](https://user-images.githubusercontent.com/7288322/34471967-1df7808a-efbb-11e7-9088-ed0b04151291.png)](https://discord.gg/CTYGPUJ)

 This is the core repository for Prysm, a [Golang](https://golang.org/) implementation of the [Ethereum Consensus](https://ethereum.org/en/eth2/) specification, developed by [Prysmatic Labs](https://prysmaticlabs.com). See the [Changelog](https://github.com/prysmaticlabs/prysm/releases) for details of the latest releases and upcoming breaking changes.
--- a/14
+++ b/14
@@ -60,10 +60,10 @@ bazel_skylib_workspace()

 http_archive(
    name = "bazel_gazelle",
-    sha256 = "5982e5463f171da99e3bdaeff8c0f48283a7a5f396ec5282910b9e8a49c0dd7e",
+    sha256 = "de69a09dc70417580aabf20a28619bb3ef60d038470c7cf8442fafcf627c21cb",
    urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.25.0/bazel-gazelle-v0.25.0.tar.gz",
-        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.25.0/bazel-gazelle-v0.25.0.tar.gz",
+        "https://mirror.bazel.build/github.com/bazelbuild/bazel-gazelle/releases/download/v0.24.0/bazel-gazelle-v0.24.0.tar.gz",
+        "https://github.com/bazelbuild/bazel-gazelle/releases/download/v0.24.0/bazel-gazelle-v0.24.0.tar.gz",
    ],
 )

@@ -88,10 +88,10 @@ http_archive(
        # Expose internals of go_test for custom build transitions.
        "//third_party:io_bazel_rules_go_test.patch",
    ],
-    sha256 = "f2dcd210c7095febe54b804bb1cd3a58fe8435a909db2ec04e31542631cf715c",
+    sha256 = "2b1641428dff9018f9e85c0384f03ec6c10660d935b750e3fa1492a281a53b0f",
    urls = [
-        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.31.0/rules_go-v0.31.0.zip",
-        "https://github.com/bazelbuild/rules_go/releases/download/v0.31.0/rules_go-v0.31.0.zip",
+        "https://mirror.bazel.build/github.com/bazelbuild/rules_go/releases/download/v0.29.0/rules_go-v0.29.0.zip",
+        "https://github.com/bazelbuild/rules_go/releases/download/v0.29.0/rules_go-v0.29.0.zip",
    ],
 )

@@ -176,7 +176,7 @@ load("@io_bazel_rules_go//go:deps.bzl", "go_register_toolchains", "go_rules_depe
 go_rules_dependencies()

 go_register_toolchains(
-    go_version = "1.18.1",
+    go_version = "1.17.6",
    nogo = "@//:nogo",
 )

--- a/api/client/beacon/BUILD.bazel
+++ b/api/client/beacon/BUILD.bazel
@@ -14,17 +14,17 @@ go_library(
        "//beacon-chain/core/helpers:go_default_library",
        "//beacon-chain/rpc/apimiddleware:go_default_library",
        "//beacon-chain/state:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
-        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//encoding/ssz/detect:go_default_library",
        "//io/file:go_default_library",
        "//network/forks:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
+        "//proto/prysm/v1alpha1/block:go_default_library",
        "//runtime/version:go_default_library",
        "//time/slots:go_default_library",
        "@com_github_ethereum_go_ethereum//common/hexutil:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@org_golang_x_mod//semver:go_default_library",
    ],
@@ -40,15 +40,15 @@ go_test(
    deps = [
        "//beacon-chain/state:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/primitives:go_default_library",
-        "//consensus-types/wrapper:go_default_library",
        "//encoding/ssz/detect:go_default_library",
        "//network/forks:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
+        "//proto/prysm/v1alpha1/wrapper:go_default_library",
        "//runtime/version:go_default_library",
        "//testing/require:go_default_library",
        "//testing/util:go_default_library",
        "//time/slots:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
    ],
 )
--- a/api/client/beacon/checkpoint.go
+++ b/api/client/beacon/checkpoint.go
@@ -6,12 +6,12 @@ import (
 	"path"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/ssz/detect"
 	"github.com/prysmaticlabs/prysm/io/file"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/runtime/version"
 	"github.com/prysmaticlabs/prysm/time/slots"
 	log "github.com/sirupsen/logrus"
@@ -25,7 +25,7 @@ type OriginData struct {
 	sb  []byte
 	bb  []byte
 	st  state.BeaconState
-	b   interfaces.SignedBeaconBlock
+	b   block.SignedBeaconBlock
 	cf  *detect.VersionedUnmarshaler
 }

@@ -40,15 +40,15 @@ func (od *OriginData) CheckpointString() string {
 // SaveBlock saves the downloaded block to a unique file in the given path.
 // For readability and collision avoidance, the file name includes: type, config name, slot and root
 func (od *OriginData) SaveBlock(dir string) (string, error) {
-	blockPath := path.Join(dir, fname("block", od.cf, od.b.Block().Slot(), od.wsd.BlockRoot))
-	return blockPath, file.WriteFile(blockPath, od.BlockBytes())
+	blockPath := path.Join(dir, fname("state", od.cf, od.st.Slot(), od.wsd.BlockRoot))
+	return blockPath, file.WriteFile(blockPath, od.sb)
 }

 // SaveState saves the downloaded state to a unique file in the given path.
 // For readability and collision avoidance, the file name includes: type, config name, slot and root
 func (od *OriginData) SaveState(dir string) (string, error) {
 	statePath := path.Join(dir, fname("state", od.cf, od.st.Slot(), od.wsd.StateRoot))
-	return statePath, file.WriteFile(statePath, od.StateBytes())
+	return statePath, file.WriteFile(statePath, od.sb)
 }

 // StateBytes returns the ssz-encoded bytes of the downloaded BeaconState value.
--- a/api/client/beacon/checkpoint_test.go
+++ b/api/client/beacon/checkpoint_test.go
@@ -7,10 +7,9 @@ import (
 	"fmt"
 	"io"
 	"net/http"
-	"net/url"
 	"testing"

-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"

 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/network/forks"
@@ -18,8 +17,8 @@ import (
 	"github.com/prysmaticlabs/prysm/testing/util"
 	"github.com/prysmaticlabs/prysm/time/slots"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/ssz/detect"
 	"github.com/prysmaticlabs/prysm/runtime/version"

@@ -67,8 +66,9 @@ func TestMarshalToEnvelope(t *testing.T) {

 func TestFallbackVersionCheck(t *testing.T) {
 	c := &Client{
-		hc:      &http.Client{},
-		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+		hc:     &http.Client{},
+		host:   "localhost:3500",
+		scheme: "http",
 	}
 	c.hc.Transport = &testRT{rt: func(req *http.Request) (*http.Response, error) {
 		res := &http.Response{Request: req}
@@ -200,8 +200,9 @@ func TestDownloadOriginData(t *testing.T) {
 		}},
 	}
 	c := &Client{
-		hc:      hc,
-		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+		hc:     hc,
+		host:   "localhost:3500",
+		scheme: "http",
 	}

 	od, err := DownloadOriginData(ctx, c)
@@ -293,8 +294,9 @@ func TestDownloadBackwardsCompatibleCombined(t *testing.T) {
 		}},
 	}
 	c := &Client{
-		hc:      hc,
-		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+		hc:     hc,
+		host:   "localhost:3500",
+		scheme: "http",
 	}

 	odPub, err := DownloadOriginData(ctx, c)
@@ -325,8 +327,9 @@ func TestGetWeakSubjectivityEpochFromHead(t *testing.T) {
 		}},
 	}
 	c := &Client{
-		hc:      hc,
-		baseURL: &url.URL{Host: "localhost:3500", Scheme: "http"},
+		hc:     hc,
+		host:   "localhost:3500",
+		scheme: "http",
 	}
 	actualEpoch, err := getWeakSubjectivityEpochFromHead(context.Background(), c)
 	require.NoError(t, err)
--- a/api/client/beacon/client.go
+++ b/api/client/beacon/client.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"net/url"
@@ -20,8 +21,8 @@ import (

 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/rpc/apimiddleware"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	log "github.com/sirupsen/logrus"
@@ -52,8 +53,6 @@ const (
 	IdJustified StateOrBlockId = "justified"
 )

-var ErrMalformedHostname = errors.New("hostname must include port, separated by one colon, like example.com:3500")
-
 // IdFromRoot encodes a block root in the format expected by the API in places where a root can be used to identify
 // a BeaconState or SignedBeaconBlock.
 func IdFromRoot(r [32]byte) StateOrBlockId {
@@ -95,23 +94,23 @@ func WithTimeout(timeout time.Duration) ClientOpt {

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

 // NewClient constructs a new client with the provided options (ex WithTimeout).
 // `host` is the base host + port used to construct request urls. This value can be
 // a URL string, or NewClient will assume an http endpoint if just `host:port` is used.
 func NewClient(host string, opts ...ClientOpt) (*Client, error) {
-	u, err := urlForHost(host)
+	host, err := validHostname(host)
 	if err != nil {
 		return nil, err
 	}
 	c := &Client{
-		hc:      &http.Client{},
-		baseURL: u,
+		hc:     &http.Client{},
+		scheme: "http",
+		host:   host,
 	}
 	for _, o := range opts {
 		o(c)
@@ -119,23 +118,27 @@ func NewClient(host string, opts ...ClientOpt) (*Client, error) {
 	return c, nil
 }

-func urlForHost(h string) (*url.URL, error) {
+func validHostname(h string) (string, error) {
 	// try to parse as url (being permissive)
 	u, err := url.Parse(h)
 	if err == nil && u.Host != "" {
-		return u, nil
+		return u.Host, nil
 	}
 	// try to parse as host:port
 	host, port, err := net.SplitHostPort(h)
 	if err != nil {
-		return nil, ErrMalformedHostname
+		return "", err
 	}
-	return &url.URL{Host: fmt.Sprintf("%s:%s", host, port), Scheme: "http"}, nil
+	return fmt.Sprintf("%s:%s", host, port), nil
 }

-// NodeURL returns a human-readable string representation of the beacon node base url.
-func (c *Client) NodeURL() string {
-	return c.baseURL.String()
+func (c *Client) urlForPath(methodPath string) *url.URL {
+	u := &url.URL{
+		Scheme: c.scheme,
+		Host:   c.host,
+	}
+	u.Path = path.Join(u.Path, methodPath)
+	return u
 }

 type reqOption func(*http.Request)
@@ -148,7 +151,7 @@ func withSSZEncoding() reqOption {

 // get is a generic, opinionated GET function to reduce boilerplate amongst the getters in this package.
 func (c *Client) get(ctx context.Context, path string, opts ...reqOption) ([]byte, error) {
-	u := c.baseURL.ResolveReference(&url.URL{Path: path})
+	u := c.urlForPath(path)
 	log.Printf("requesting %s", u.String())
 	req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
 	if err != nil {
@@ -261,7 +264,7 @@ type NodeVersion struct {
 	systemInfo     string
 }

-var versionRE = regexp.MustCompile(`^(\w+)/(v\d+\.\d+\.\d+[-a-zA-Z0-9]*)\s*/?(.*)$`)
+var versionRE = regexp.MustCompile(`^(\w+)\/(v\d+\.\d+\.\d+) \((.*)\)$`)

 func parseNodeVersion(v string) (*NodeVersion, error) {
 	groups := versionRE.FindStringSubmatch(v)
@@ -357,7 +360,7 @@ type WeakSubjectivityData struct {
 }

 func non200Err(response *http.Response) error {
-	bodyBytes, err := io.ReadAll(response.Body)
+	bodyBytes, err := ioutil.ReadAll(response.Body)
 	var body string
 	if err != nil {
 		body = "(Unable to read response body.)"
--- a/api/client/beacon/client_test.go
+++ b/api/client/beacon/client_test.go
@@ -1,7 +1,6 @@
 package beacon

 import (
-	"net/url"
 	"testing"

 	"github.com/prysmaticlabs/prysm/testing/require"
@@ -29,40 +28,18 @@ func TestParseNodeVersion(t *testing.T) {
 			v:    "v2.0.6",
 			err:  ErrInvalidNodeVersion,
 		},
+		{
+			name: "implementation and semver only",
+			v:    "Prysm/v2.0.6",
+			err:  ErrInvalidNodeVersion,
+		},
 		{
 			name: "complete version",
 			v:    "Prysm/v2.0.6 (linux amd64)",
 			nv: &NodeVersion{
 				implementation: "Prysm",
 				semver:         "v2.0.6",
-				systemInfo:     "(linux amd64)",
-			},
-		},
-		{
-			name: "nimbus version",
-			v:    "Nimbus/v22.4.0-039bec-stateofus",
-			nv: &NodeVersion{
-				implementation: "Nimbus",
-				semver:         "v22.4.0-039bec-stateofus",
-				systemInfo:     "",
-			},
-		},
-		{
-			name: "teku version",
-			v:    "teku/v22.3.2/linux-x86_64/oracle-java-11",
-			nv: &NodeVersion{
-				implementation: "teku",
-				semver:         "v22.3.2",
-				systemInfo:     "linux-x86_64/oracle-java-11",
-			},
-		},
-		{
-			name: "lighthouse version",
-			v:    "Lighthouse/v2.1.1-5f628a7/x86_64-linux",
-			nv: &NodeVersion{
-				implementation: "Lighthouse",
-				semver:         "v2.1.1-5f628a7",
-				systemInfo:     "x86_64-linux",
+				systemInfo:     "linux amd64",
 			},
 		},
 	}
@@ -79,60 +56,3 @@ func TestParseNodeVersion(t *testing.T) {
 		})
 	}
 }
-
-func TestValidHostname(t *testing.T) {
-	cases := []struct {
-		name    string
-		hostArg string
-		path    string
-		joined  string
-		err     error
-	}{
-		{
-			name:    "hostname without port",
-			hostArg: "mydomain.org",
-			err:     ErrMalformedHostname,
-		},
-		{
-			name:    "hostname with port",
-			hostArg: "mydomain.org:3500",
-			path:    getNodeVersionPath,
-			joined:  "http://mydomain.org:3500/eth/v1/node/version",
-		},
-		{
-			name:    "https scheme, hostname with port",
-			hostArg: "https://mydomain.org:3500",
-			path:    getNodeVersionPath,
-			joined:  "https://mydomain.org:3500/eth/v1/node/version",
-		},
-		{
-			name:    "http scheme, hostname without port",
-			hostArg: "http://mydomain.org",
-			path:    getNodeVersionPath,
-			joined:  "http://mydomain.org/eth/v1/node/version",
-		},
-		{
-			name:    "http scheme, trailing slash, hostname without port",
-			hostArg: "http://mydomain.org/",
-			path:    getNodeVersionPath,
-			joined:  "http://mydomain.org/eth/v1/node/version",
-		},
-		{
-			name:    "http scheme, hostname with basic auth creds and no port",
-			hostArg: "http://username:pass@mydomain.org/",
-			path:    getNodeVersionPath,
-			joined:  "http://username:pass@mydomain.org/eth/v1/node/version",
-		},
-	}
-	for _, c := range cases {
-		t.Run(c.name, func(t *testing.T) {
-			cl, err := NewClient(c.hostArg)
-			if c.err != nil {
-				require.ErrorIs(t, err, c.err)
-				return
-			}
-			require.NoError(t, err)
-			require.Equal(t, c.joined, cl.baseURL.ResolveReference(&url.URL{Path: c.path}).String())
-		})
-	}
-}
--- a/api/gateway/apimiddleware/process_field.go
+++ b/api/gateway/apimiddleware/process_field.go
@@ -3,7 +3,6 @@ package apimiddleware
 import (
 	"encoding/base64"
 	"fmt"
-	"math/big"
 	"reflect"
 	"strconv"
 	"strings"
@@ -74,10 +73,6 @@ func processField(s interface{}, processors []fieldProcessor) error {
 }

 func hexToBase64Processor(v reflect.Value) error {
-	if v.String() == "0x" {
-		v.SetString("")
-		return nil
-	}
 	b, err := bytesutil.FromHexString(v.String())
 	if err != nil {
 		return err
@@ -88,8 +83,6 @@ func hexToBase64Processor(v reflect.Value) error {

 func base64ToHexProcessor(v reflect.Value) error {
 	if v.String() == "" {
-		// Empty hex values are represented as "0x".
-		v.SetString("0x")
 		return nil
 	}
 	b, err := base64.StdEncoding.DecodeString(v.String())
@@ -100,55 +93,6 @@ func base64ToHexProcessor(v reflect.Value) error {
 	return nil
 }

-func base64ToUint256Processor(v reflect.Value) error {
-	if v.String() == "" {
-		return nil
-	}
-	littleEndian, err := base64.StdEncoding.DecodeString(v.String())
-	if err != nil {
-		return err
-	}
-	if len(littleEndian) != 32 {
-		return errors.New("invalid length for Uint256")
-	}
-
-	// Integers are stored as little-endian, but
-	// big.Int expects big-endian. So we need to reverse
-	// the byte order before decoding.
-	var bigEndian [32]byte
-	for i := 0; i < len(littleEndian); i++ {
-		bigEndian[i] = littleEndian[len(littleEndian)-1-i]
-	}
-	var uint256 big.Int
-	uint256.SetBytes(bigEndian[:])
-	v.SetString(uint256.String())
-	return nil
-}
-
-func uint256ToBase64Processor(v reflect.Value) error {
-	if v.String() == "" {
-		return nil
-	}
-	uint256, ok := new(big.Int).SetString(v.String(), 10)
-	if !ok {
-		return fmt.Errorf("could not parse Uint256")
-	}
-	bigEndian := uint256.Bytes()
-	if len(bigEndian) > 32 {
-		return fmt.Errorf("number too big for Uint256")
-	}
-
-	// Integers are stored as little-endian, but
-	// big.Int gives big-endian. So we need to reverse
-	// the byte order before encoding.
-	var littleEndian [32]byte
-	for i := 0; i < len(bigEndian); i++ {
-		littleEndian[i] = bigEndian[len(bigEndian)-1-i]
-	}
-	v.SetString(base64.StdEncoding.EncodeToString(littleEndian[:]))
-	return nil
-}
-
 func enumToLowercaseProcessor(v reflect.Value) error {
 	v.SetString(strings.ToLower(v.String()))
 	return nil
--- a/api/gateway/apimiddleware/process_request.go
+++ b/api/gateway/apimiddleware/process_request.go
@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"encoding/json"
 	"io"
+	"io/ioutil"
 	"net"
 	"net/http"
 	"strconv"
@@ -37,10 +38,6 @@ func ProcessRequestContainerFields(requestContainer interface{}) ErrorJson {
 			tag: "hex",
 			f:   hexToBase64Processor,
 		},
-		{
-			tag: "uint256",
-			f:   uint256ToBase64Processor,
-		},
 	}); err != nil {
 		return InternalServerErrorWithMessage(err, "could not process request data")
 	}
@@ -55,7 +52,7 @@ func SetRequestBodyToRequestContainer(requestContainer interface{}, req *http.Re
 		return InternalServerErrorWithMessage(err, "could not marshal request")
 	}
 	// Set the body to the new JSON.
-	req.Body = io.NopCloser(bytes.NewReader(j))
+	req.Body = ioutil.NopCloser(bytes.NewReader(j))
 	req.Header.Set("Content-Length", strconv.Itoa(len(j)))
 	req.ContentLength = int64(len(j))
 	return nil
@@ -96,7 +93,7 @@ func (m *ApiProxyMiddleware) ProxyRequest(req *http.Request) (*http.Response, Er

 // ReadGrpcResponseBody reads the body from the grpc-gateway's response.
 func ReadGrpcResponseBody(r io.Reader) ([]byte, ErrorJson) {
-	body, err := io.ReadAll(r)
+	body, err := ioutil.ReadAll(r)
 	if err != nil {
 		return nil, InternalServerErrorWithMessage(err, "could not read response body")
 	}
@@ -157,10 +154,6 @@ func ProcessMiddlewareResponseFields(responseContainer interface{}) ErrorJson {
 			tag: "time",
 			f:   timeToUnixProcessor,
 		},
-		{
-			tag: "uint256",
-			f:   base64ToUint256Processor,
-		},
 	}); err != nil {
 		return InternalServerErrorWithMessage(err, "could not process response data")
 	}
@@ -202,7 +195,7 @@ func WriteMiddlewareResponseHeadersAndBody(grpcResp *http.Response, responseJson
 		} else {
 			w.WriteHeader(grpcResp.StatusCode)
 		}
-		if _, err := io.Copy(w, io.NopCloser(bytes.NewReader(responseJson))); err != nil {
+		if _, err := io.Copy(w, ioutil.NopCloser(bytes.NewReader(responseJson))); err != nil {
 			return InternalServerErrorWithMessage(err, "could not write response message")
 		}
 	} else {
@@ -256,7 +249,7 @@ func WriteError(w http.ResponseWriter, errJson ErrorJson, responseHeader http.He
 	w.Header().Set("Content-Length", strconv.Itoa(len(j)))
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(errJson.StatusCode())
-	if _, err := io.Copy(w, io.NopCloser(bytes.NewReader(j))); err != nil {
+	if _, err := io.Copy(w, ioutil.NopCloser(bytes.NewReader(j))); err != nil {
 		log.WithError(err).Error("Could not write error message")
 	}
 }
--- a/api/gateway/apimiddleware/process_request_test.go
+++ b/api/gateway/apimiddleware/process_request_test.go
@@ -15,40 +15,30 @@ import (
 )

 type testRequestContainer struct {
-	TestString         string
-	TestHexString      string `hex:"true"`
-	TestEmptyHexString string `hex:"true"`
-	TestUint256String  string `uint256:"true"`
+	TestString    string
+	TestHexString string `hex:"true"`
 }

 func defaultRequestContainer() *testRequestContainer {
 	return &testRequestContainer{
-		TestString:         "test string",
-		TestHexString:      "0x666F6F", // hex encoding of "foo"
-		TestEmptyHexString: "0x",
-		TestUint256String:  "4196",
+		TestString:    "test string",
+		TestHexString: "0x666F6F", // hex encoding of "foo"
 	}
 }

 type testResponseContainer struct {
-	TestString   string
-	TestHex      string `hex:"true"`
-	TestEmptyHex string `hex:"true"`
-	TestUint256  string `uint256:"true"`
-	TestEnum     string `enum:"true"`
-	TestTime     string `time:"true"`
+	TestString string
+	TestHex    string `hex:"true"`
+	TestEnum   string `enum:"true"`
+	TestTime   string `time:"true"`
 }

 func defaultResponseContainer() *testResponseContainer {
 	return &testResponseContainer{
-		TestString:   "test string",
-		TestHex:      "Zm9v", // base64 encoding of "foo"
-		TestEmptyHex: "",
-		TestEnum:     "Test Enum",
-		TestTime:     "2006-01-02T15:04:05Z",
-
-		// base64 encoding of 4196 in little-endian
-		TestUint256: "ZBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=",
+		TestString: "test string",
+		TestHex:    "Zm9v", // base64 encoding of "foo"
+		TestEnum:   "Test Enum",
+		TestTime:   "2006-01-02T15:04:05Z",
 	}
 }

@@ -116,8 +106,6 @@ func TestProcessRequestContainerFields(t *testing.T) {
 		errJson := ProcessRequestContainerFields(container)
 		require.Equal(t, true, errJson == nil)
 		assert.Equal(t, "Zm9v", container.TestHexString)
-		assert.Equal(t, "", container.TestEmptyHexString)
-		assert.Equal(t, "ZBAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=", container.TestUint256String)
 	})

 	t.Run("error", func(t *testing.T) {
@@ -140,8 +128,8 @@ func TestSetRequestBodyToRequestContainer(t *testing.T) {
 	contentLengthHeader, ok := request.Header["Content-Length"]
 	require.Equal(t, true, ok)
 	require.Equal(t, 1, len(contentLengthHeader), "wrong number of header values")
-	assert.Equal(t, "108", contentLengthHeader[0])
-	assert.Equal(t, int64(108), request.ContentLength)
+	assert.Equal(t, "55", contentLengthHeader[0])
+	assert.Equal(t, int64(55), request.ContentLength)
 }

 func TestPrepareRequestForProxying(t *testing.T) {
@@ -246,8 +234,6 @@ func TestProcessMiddlewareResponseFields(t *testing.T) {
 		errJson := ProcessMiddlewareResponseFields(container)
 		require.Equal(t, true, errJson == nil)
 		assert.Equal(t, "0x666f6f", container.TestHex)
-		assert.Equal(t, "0x", container.TestEmptyHex)
-		assert.Equal(t, "4196", container.TestUint256)
 		assert.Equal(t, "test enum", container.TestEnum)
 		assert.Equal(t, "1136214245", container.TestTime)
 	})
@@ -292,7 +278,7 @@ func TestWriteMiddlewareResponseHeadersAndBody(t *testing.T) {
 		v, ok = writer.Header()["Content-Length"]
 		require.Equal(t, true, ok, "header not found")
 		require.Equal(t, 1, len(v), "wrong number of header values")
-		assert.Equal(t, "181", v[0])
+		assert.Equal(t, "102", v[0])
 		assert.Equal(t, 204, writer.Code)
 		assert.DeepEqual(t, responseJson, writer.Body.Bytes())
 	})
--- a/beacon-chain/blockchain/BUILD.bazel
+++ b/beacon-chain/blockchain/BUILD.bazel
@@ -5,13 +5,13 @@ go_library(
    srcs = [
        "chain_info.go",
        "error.go",
-        "execution_engine.go",
        "head.go",
        "head_sync_committee_info.go",
        "init_sync_process_block.go",
        "log.go",
        "metrics.go",
        "new_slot.go",
+        "optimistic_sync.go",
        "options.go",
        "pow_block.go",
        "process_attestation.go",
@@ -48,7 +48,6 @@ go_library(
        "//beacon-chain/core/transition:go_default_library",
        "//beacon-chain/db:go_default_library",
        "//beacon-chain/db/filters:go_default_library",
-        "//beacon-chain/db/kv:go_default_library",
        "//beacon-chain/forkchoice:go_default_library",
        "//beacon-chain/forkchoice/doubly-linked-tree:go_default_library",
        "//beacon-chain/forkchoice/protoarray:go_default_library",
@@ -58,22 +57,21 @@ go_library(
        "//beacon-chain/operations/voluntaryexits:go_default_library",
        "//beacon-chain/p2p:go_default_library",
        "//beacon-chain/powchain:go_default_library",
+        "//beacon-chain/powchain/engine-api-client/v1:go_default_library",
        "//beacon-chain/state:go_default_library",
        "//beacon-chain/state/stategen:go_default_library",
        "//cmd/beacon-chain/flags:go_default_library",
        "//config/features:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
-        "//consensus-types/primitives:go_default_library",
        "//crypto/bls:go_default_library",
        "//encoding/bytesutil:go_default_library",
-        "//math:go_default_library",
        "//monitoring/tracing:go_default_library",
        "//proto/engine/v1:go_default_library",
        "//proto/eth/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//proto/prysm/v1alpha1/attestation:go_default_library",
+        "//proto/prysm/v1alpha1/block:go_default_library",
        "//runtime/version:go_default_library",
        "//time:go_default_library",
        "//time/slots:go_default_library",
@@ -83,6 +81,7 @@ go_library(
        "@com_github_pkg_errors//:go_default_library",
        "@com_github_prometheus_client_golang//prometheus:go_default_library",
        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@io_opencensus_go//trace:go_default_library",
    ],
@@ -103,13 +102,14 @@ go_test(
        "blockchain_test.go",
        "chain_info_test.go",
        "checktags_test.go",
-        "execution_engine_test.go",
        "head_sync_committee_info_test.go",
        "head_test.go",
        "init_test.go",
        "log_test.go",
        "metrics_test.go",
+        "mock_engine_test.go",
        "mock_test.go",
+        "optimistic_sync_test.go",
        "pow_block_test.go",
        "process_attestation_test.go",
        "process_block_test.go",
@@ -131,14 +131,13 @@ go_test(
        "//beacon-chain/db/testing:go_default_library",
        "//beacon-chain/p2p:go_default_library",
        "//beacon-chain/powchain:go_default_library",
-        "//beacon-chain/powchain/testing:go_default_library",
        "//beacon-chain/state/stateutil:go_default_library",
        "//beacon-chain/state/v1:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/wrapper:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
+        "//proto/prysm/v1alpha1/wrapper:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
        "//testing/util:go_default_library",
@@ -185,11 +184,10 @@ go_test(
        "//beacon-chain/db/testing:go_default_library",
        "//beacon-chain/p2p:go_default_library",
        "//beacon-chain/powchain:go_default_library",
-        "//beacon-chain/powchain/testing:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/wrapper:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
+        "//proto/prysm/v1alpha1/wrapper:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
        "//testing/util:go_default_library",
--- a/beacon-chain/blockchain/blockchain_test.go
+++ b/beacon-chain/blockchain/blockchain_test.go
@@ -1,7 +1,7 @@
 package blockchain

 import (
-	"io"
+	"io/ioutil"
 	"testing"

 	"github.com/sirupsen/logrus"
@@ -9,7 +9,7 @@ import (

 func TestMain(m *testing.M) {
 	logrus.SetLevel(logrus.DebugLevel)
-	logrus.SetOutput(io.Discard)
+	logrus.SetOutput(ioutil.Discard)

 	m.Run()
 }
--- a/beacon-chain/blockchain/chain_info.go
+++ b/beacon-chain/blockchain/chain_info.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"time"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/doubly-linked-tree"
@@ -11,10 +12,9 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/time/slots"
 	"go.opencensus.io/trace"
 )
@@ -47,9 +47,10 @@ type GenesisFetcher interface {
 type HeadFetcher interface {
 	HeadSlot() types.Slot
 	HeadRoot(ctx context.Context) ([]byte, error)
-	HeadBlock(ctx context.Context) (interfaces.SignedBeaconBlock, error)
+	HeadBlock(ctx context.Context) (block.SignedBeaconBlock, error)
 	HeadState(ctx context.Context) (state.BeaconState, error)
 	HeadValidatorsIndices(ctx context.Context, epoch types.Epoch) ([]types.ValidatorIndex, error)
+	HeadSeed(ctx context.Context, epoch types.Epoch) ([32]byte, error)
 	HeadGenesisValidatorsRoot() [32]byte
 	HeadETH1Data() *ethpb.Eth1Data
 	HeadPublicKeyToValidatorIndex(pubKey [fieldparams.BLSPubkeyLength]byte) (types.ValidatorIndex, bool)
@@ -59,17 +60,18 @@ type HeadFetcher interface {
 	IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool, error)
 	HeadSyncCommitteeFetcher
 	HeadDomainFetcher
+	ForkChoicer() forkchoice.ForkChoicer
 }

 // ForkFetcher retrieves the current fork information of the Ethereum beacon chain.
 type ForkFetcher interface {
-	ForkChoicer() forkchoice.ForkChoicer
 	CurrentFork() *ethpb.Fork
 }

 // CanonicalFetcher retrieves the current chain's canonical information.
 type CanonicalFetcher interface {
 	IsCanonical(ctx context.Context, blockRoot [32]byte) (bool, error)
+	VerifyBlkDescendant(ctx context.Context, blockRoot [32]byte) error
 }

 // FinalizationFetcher defines a common interface for methods in blockchain service which
@@ -78,7 +80,6 @@ type FinalizationFetcher interface {
 	FinalizedCheckpt() *ethpb.Checkpoint
 	CurrentJustifiedCheckpt() *ethpb.Checkpoint
 	PreviousJustifiedCheckpt() *ethpb.Checkpoint
-	VerifyFinalizedBlkDescendant(ctx context.Context, blockRoot [32]byte) error
 }

 // FinalizedCheckpt returns the latest finalized checkpoint from chain store.
@@ -163,7 +164,7 @@ func (s *Service) HeadRoot(ctx context.Context) ([]byte, error) {
 // HeadBlock returns the head block of the chain.
 // If the head is nil from service struct,
 // it will attempt to get the head block from DB.
-func (s *Service) HeadBlock(ctx context.Context) (interfaces.SignedBeaconBlock, error) {
+func (s *Service) HeadBlock(ctx context.Context) (block.SignedBeaconBlock, error) {
 	s.headLock.RLock()
 	defer s.headLock.RUnlock()

@@ -204,6 +205,18 @@ func (s *Service) HeadValidatorsIndices(ctx context.Context, epoch types.Epoch)
 	return helpers.ActiveValidatorIndices(ctx, s.headState(ctx), epoch)
 }

+// HeadSeed returns the seed from the head view of a given epoch.
+func (s *Service) HeadSeed(ctx context.Context, epoch types.Epoch) ([32]byte, error) {
+	s.headLock.RLock()
+	defer s.headLock.RUnlock()
+
+	if !s.hasHeadState() {
+		return [32]byte{}, nil
+	}
+
+	return helpers.Seed(s.headState(ctx), epoch, params.BeaconConfig().DomainBeaconAttester)
+}
+
 // HeadGenesisValidatorsRoot returns genesis validators root of the head state.
 func (s *Service) HeadGenesisValidatorsRoot() [32]byte {
 	s.headLock.RLock()
@@ -260,13 +273,13 @@ func (s *Service) CurrentFork() *ethpb.Fork {

 // IsCanonical returns true if the input block root is part of the canonical chain.
 func (s *Service) IsCanonical(ctx context.Context, blockRoot [32]byte) (bool, error) {
-	// If the block has not been finalized, check fork choice store to see if the block is canonical
-	if s.cfg.ForkChoiceStore.HasNode(blockRoot) {
-		return s.cfg.ForkChoiceStore.IsCanonical(blockRoot), nil
+	// If the block has been finalized, the block will always be part of the canonical chain.
+	if s.cfg.BeaconDB.IsFinalizedBlock(ctx, blockRoot) {
+		return true, nil
 	}

-	// If the block has been finalized, the block will always be part of the canonical chain.
-	return s.cfg.BeaconDB.IsFinalizedBlock(ctx, blockRoot), nil
+	// If the block has not been finalized, check fork choice store to see if the block is canonical
+	return s.cfg.ForkChoiceStore.IsCanonical(blockRoot), nil
 }

 // ChainHeads returns all possible chain heads (leaves of fork choice tree).
@@ -315,10 +328,10 @@ func (s *Service) IsOptimistic(ctx context.Context) (bool, error) {
 	return s.IsOptimisticForRoot(ctx, s.head.root)
 }

-// IsOptimisticForRoot takes the root and slot as arguments instead of the current head
+// IsOptimisticForRoot takes the root and slot as aguments instead of the current head
 // and returns true if it is optimistic.
 func (s *Service) IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool, error) {
-	optimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(root)
+	optimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(ctx, root)
 	if err == nil {
 		return optimistic, nil
 	}
@@ -345,26 +358,11 @@ func (s *Service) IsOptimisticForRoot(ctx context.Context, root [32]byte) (bool,
 		return false, nil
 	}

-	// checkpoint root could be zeros before the first finalized epoch. Use genesis root if the case.
-	lastValidated, err := s.cfg.BeaconDB.StateSummary(ctx, s.ensureRootNotZeros(bytesutil.ToBytes32(validatedCheckpoint.Root)))
+	lastValidated, err := s.cfg.BeaconDB.StateSummary(ctx, bytesutil.ToBytes32(validatedCheckpoint.Root))
 	if err != nil {
 		return false, err
 	}
-	if lastValidated == nil {
-		return false, errInvalidNilSummary
-	}
-
-	if ss.Slot > lastValidated.Slot {
-		return true, nil
-	}
-
-	isCanonical, err := s.IsCanonical(ctx, root)
-	if err != nil {
-		return false, err
-	}
-
-	// historical non-canonical blocks here are returned as optimistic for safety.
-	return !isCanonical, nil
+	return ss.Slot > lastValidated.Slot, nil
 }

 // SetGenesisTime sets the genesis time of beacon chain.
--- a/beacon-chain/blockchain/chain_info_norace_test.go
+++ b/beacon-chain/blockchain/chain_info_norace_test.go
@@ -6,10 +6,9 @@ import (

 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/require"
-	"github.com/prysmaticlabs/prysm/testing/util"
 )

 func TestHeadSlot_DataRace(t *testing.T) {
@@ -17,13 +16,10 @@ func TestHeadSlot_DataRace(t *testing.T) {
 	s := &Service{
 		cfg: &config{BeaconDB: beaconDB},
 	}
-	b, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlock())
-	require.NoError(t, err)
-	st, _ := util.DeterministicGenesisState(t, 1)
 	wait := make(chan struct{})
 	go func() {
 		defer close(wait)
-		require.NoError(t, s.saveHead(context.Background(), [32]byte{}, b, st))
+		require.NoError(t, s.saveHead(context.Background(), [32]byte{}))
 	}()
 	s.HeadSlot()
 	<-wait
@@ -35,16 +31,12 @@ func TestHeadRoot_DataRace(t *testing.T) {
 		cfg:  &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB)},
 		head: &head{root: [32]byte{'A'}},
 	}
-	b, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlock())
-	require.NoError(t, err)
 	wait := make(chan struct{})
-	st, _ := util.DeterministicGenesisState(t, 1)
 	go func() {
 		defer close(wait)
-		require.NoError(t, s.saveHead(context.Background(), [32]byte{}, b, st))
-
+		require.NoError(t, s.saveHead(context.Background(), [32]byte{}))
 	}()
-	_, err = s.HeadRoot(context.Background())
+	_, err := s.HeadRoot(context.Background())
 	require.NoError(t, err)
 	<-wait
 }
@@ -57,14 +49,10 @@ func TestHeadBlock_DataRace(t *testing.T) {
 		cfg:  &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB)},
 		head: &head{block: wsb},
 	}
-	b, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlock())
-	require.NoError(t, err)
 	wait := make(chan struct{})
-	st, _ := util.DeterministicGenesisState(t, 1)
 	go func() {
 		defer close(wait)
-		require.NoError(t, s.saveHead(context.Background(), [32]byte{}, b, st))
-
+		require.NoError(t, s.saveHead(context.Background(), [32]byte{}))
 	}()
 	_, err = s.HeadBlock(context.Background())
 	require.NoError(t, err)
@@ -76,16 +64,12 @@ func TestHeadState_DataRace(t *testing.T) {
 	s := &Service{
 		cfg: &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB)},
 	}
-	b, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlock())
-	require.NoError(t, err)
 	wait := make(chan struct{})
-	st, _ := util.DeterministicGenesisState(t, 1)
 	go func() {
 		defer close(wait)
-		require.NoError(t, s.saveHead(context.Background(), [32]byte{}, b, st))
-
+		require.NoError(t, s.saveHead(context.Background(), [32]byte{}))
 	}()
-	_, err = s.HeadState(context.Background())
+	_, err := s.HeadState(context.Background())
 	require.NoError(t, err)
 	<-wait
 }
--- a/beacon-chain/blockchain/chain_info_test.go
+++ b/beacon-chain/blockchain/chain_info_test.go
@@ -5,16 +5,17 @@ import (
 	"testing"
 	"time"

+	types "github.com/prysmaticlabs/eth2-types"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/doubly-linked-tree"
 	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
 	v1 "github.com/prysmaticlabs/prysm/beacon-chain/state/v1"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
@@ -260,6 +261,23 @@ func TestService_HeadValidatorsIndices(t *testing.T) {
 	require.Equal(t, 10, len(indices))
 }

+func TestService_HeadSeed(t *testing.T) {
+	s, _ := util.DeterministicGenesisState(t, 1)
+	c := &Service{}
+	seed, err := helpers.Seed(s, 0, params.BeaconConfig().DomainBeaconAttester)
+	require.NoError(t, err)
+
+	c.head = &head{}
+	root, err := c.HeadSeed(context.Background(), 0)
+	require.NoError(t, err)
+	require.Equal(t, [32]byte{}, root)
+
+	c.head = &head{state: s}
+	root, err = c.HeadSeed(context.Background(), 0)
+	require.NoError(t, err)
+	require.DeepEqual(t, seed, root)
+}
+
 func TestService_HeadGenesisValidatorsRoot(t *testing.T) {
 	s, _ := util.DeterministicGenesisState(t, 1)
 	c := &Service{}
@@ -441,7 +459,7 @@ func TestService_IsOptimisticForRoot_DB_ProtoArray(t *testing.T) {
 	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: br[:], Slot: 10}))

 	optimisticBlock := util.NewBeaconBlock()
-	optimisticBlock.Block.Slot = 97
+	optimisticBlock.Block.Slot = 11
 	optimisticRoot, err := optimisticBlock.Block.HashTreeRoot()
 	require.NoError(t, err)
 	wsb, err = wrapper.WrappedSignedBeaconBlock(optimisticBlock)
@@ -459,39 +477,18 @@ func TestService_IsOptimisticForRoot_DB_ProtoArray(t *testing.T) {
 	validatedCheckpoint := &ethpb.Checkpoint{Root: br[:]}
 	require.NoError(t, beaconDB.SaveLastValidatedCheckpoint(ctx, validatedCheckpoint))

-	_, err = c.IsOptimisticForRoot(ctx, optimisticRoot)
-	require.ErrorContains(t, "nil summary returned from the DB", err)
-
 	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: optimisticRoot[:], Slot: 11}))
 	optimistic, err := c.IsOptimisticForRoot(ctx, optimisticRoot)
 	require.NoError(t, err)
 	require.Equal(t, true, optimistic)

 	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: validatedRoot[:], Slot: 9}))
-	cp := &ethpb.Checkpoint{
-		Epoch: 1,
-		Root:  validatedRoot[:],
-	}
-	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, validatedRoot))
-	require.NoError(t, beaconDB.SaveFinalizedCheckpoint(ctx, cp))
-
 	validated, err := c.IsOptimisticForRoot(ctx, validatedRoot)
 	require.NoError(t, err)
 	require.Equal(t, false, validated)
-
-	// Before the first finalized epoch, finalized root could be zeros.
-	validatedCheckpoint = &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, br))
-	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: params.BeaconConfig().ZeroHash[:], Slot: 10}))
-	require.NoError(t, beaconDB.SaveLastValidatedCheckpoint(ctx, validatedCheckpoint))
-
-	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: optimisticRoot[:], Slot: 11}))
-	optimistic, err = c.IsOptimisticForRoot(ctx, optimisticRoot)
-	require.NoError(t, err)
-	require.Equal(t, true, optimistic)
 }

-func TestService_IsOptimisticForRoot_DB_DoublyLinkedTree(t *testing.T) {
+func TestService_IsOptimisticForRoot__DB_DoublyLinkedTree(t *testing.T) {
 	beaconDB := testDB.SetupDB(t)
 	ctx := context.Background()
 	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: doublylinkedtree.New(0, 0)}, head: &head{slot: 101, root: [32]byte{'b'}}}
@@ -506,7 +503,7 @@ func TestService_IsOptimisticForRoot_DB_DoublyLinkedTree(t *testing.T) {
 	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: br[:], Slot: 10}))

 	optimisticBlock := util.NewBeaconBlock()
-	optimisticBlock.Block.Slot = 97
+	optimisticBlock.Block.Slot = 11
 	optimisticRoot, err := optimisticBlock.Block.HashTreeRoot()
 	require.NoError(t, err)
 	wsb, err = wrapper.WrappedSignedBeaconBlock(optimisticBlock)
@@ -524,78 +521,13 @@ func TestService_IsOptimisticForRoot_DB_DoublyLinkedTree(t *testing.T) {
 	validatedCheckpoint := &ethpb.Checkpoint{Root: br[:]}
 	require.NoError(t, beaconDB.SaveLastValidatedCheckpoint(ctx, validatedCheckpoint))

-	_, err = c.IsOptimisticForRoot(ctx, optimisticRoot)
-	require.ErrorContains(t, "nil summary returned from the DB", err)
-
 	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: optimisticRoot[:], Slot: 11}))
 	optimistic, err := c.IsOptimisticForRoot(ctx, optimisticRoot)
 	require.NoError(t, err)
 	require.Equal(t, true, optimistic)

 	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: validatedRoot[:], Slot: 9}))
-	cp := &ethpb.Checkpoint{
-		Epoch: 1,
-		Root:  validatedRoot[:],
-	}
-	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, validatedRoot))
-	require.NoError(t, beaconDB.SaveFinalizedCheckpoint(ctx, cp))
 	validated, err := c.IsOptimisticForRoot(ctx, validatedRoot)
 	require.NoError(t, err)
 	require.Equal(t, false, validated)
-
-	// Before the first finalized epoch, finalized root could be zeros.
-	validatedCheckpoint = &ethpb.Checkpoint{Root: params.BeaconConfig().ZeroHash[:]}
-	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, br))
-	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: params.BeaconConfig().ZeroHash[:], Slot: 10}))
-	require.NoError(t, beaconDB.SaveLastValidatedCheckpoint(ctx, validatedCheckpoint))
-
-	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: optimisticRoot[:], Slot: 11}))
-	optimistic, err = c.IsOptimisticForRoot(ctx, optimisticRoot)
-	require.NoError(t, err)
-	require.Equal(t, true, optimistic)
-}
-
-func TestService_IsOptimisticForRoot_DB_non_canonical(t *testing.T) {
-	beaconDB := testDB.SetupDB(t)
-	ctx := context.Background()
-	c := &Service{cfg: &config{BeaconDB: beaconDB, ForkChoiceStore: doublylinkedtree.New(0, 0)}, head: &head{slot: 101, root: [32]byte{'b'}}}
-	c.head = &head{root: params.BeaconConfig().ZeroHash}
-	b := util.NewBeaconBlock()
-	b.Block.Slot = 10
-	br, err := b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	wsb, err := wrapper.WrappedSignedBeaconBlock(b)
-	require.NoError(t, err)
-	require.NoError(t, beaconDB.SaveBlock(context.Background(), wsb))
-	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: br[:], Slot: 10}))
-
-	optimisticBlock := util.NewBeaconBlock()
-	optimisticBlock.Block.Slot = 97
-	optimisticRoot, err := optimisticBlock.Block.HashTreeRoot()
-	require.NoError(t, err)
-	wsb, err = wrapper.WrappedSignedBeaconBlock(optimisticBlock)
-	require.NoError(t, err)
-	require.NoError(t, beaconDB.SaveBlock(context.Background(), wsb))
-
-	validatedBlock := util.NewBeaconBlock()
-	validatedBlock.Block.Slot = 9
-	validatedRoot, err := validatedBlock.Block.HashTreeRoot()
-	require.NoError(t, err)
-	wsb, err = wrapper.WrappedSignedBeaconBlock(validatedBlock)
-	require.NoError(t, err)
-	require.NoError(t, beaconDB.SaveBlock(context.Background(), wsb))
-
-	validatedCheckpoint := &ethpb.Checkpoint{Root: br[:]}
-	require.NoError(t, beaconDB.SaveLastValidatedCheckpoint(ctx, validatedCheckpoint))
-
-	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: optimisticRoot[:], Slot: 11}))
-	optimistic, err := c.IsOptimisticForRoot(ctx, optimisticRoot)
-	require.NoError(t, err)
-	require.Equal(t, true, optimistic)
-
-	require.NoError(t, beaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Root: validatedRoot[:], Slot: 9}))
-	validated, err := c.IsOptimisticForRoot(ctx, validatedRoot)
-	require.NoError(t, err)
-	require.Equal(t, true, validated)
-
 }
--- a/beacon-chain/blockchain/error.go
+++ b/beacon-chain/blockchain/error.go
@@ -13,9 +13,7 @@ var (
 	errInvalidNilSummary = errors.New("nil summary returned from the DB")
 	// errNilParentInDB is returned when a nil parent block is returned from the DB.
 	errNilParentInDB = errors.New("nil parent block in DB")
-	// errWrongBlockCount is returned when the wrong number of blocks or
+	// errWrongBlockCound is returned when the wrong number of blocks or
 	// block roots is used
 	errWrongBlockCount = errors.New("wrong number of blocks or block roots")
-	// block is not a valid optimistic candidate block
-	errNotOptimisticCandidate = errors.New("block is not suitable for optimistic sync")
 )
--- a/beacon-chain/blockchain/execution_engine.go
+++ b/beacon-chain/blockchain/execution_engine.go
@@ -1,305 +0,0 @@
-package blockchain
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/time"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/transition"
-	"github.com/prysmaticlabs/prysm/beacon-chain/db/kv"
-	"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
-	"github.com/prysmaticlabs/prysm/beacon-chain/state"
-	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
-	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
-	enginev1 "github.com/prysmaticlabs/prysm/proto/engine/v1"
-	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
-	"github.com/prysmaticlabs/prysm/time/slots"
-	"github.com/sirupsen/logrus"
-	"go.opencensus.io/trace"
-)
-
-var (
-	ErrInvalidPayload                = errors.New("recevied an INVALID payload from execution engine")
-	ErrUndefinedExecutionEngineError = errors.New("received an undefined ee error")
-)
-
-// notifyForkchoiceUpdateArg is the argument for the forkchoice update notification `notifyForkchoiceUpdate`.
-type notifyForkchoiceUpdateArg struct {
-	headState     state.BeaconState
-	headRoot      [32]byte
-	headBlock     interfaces.BeaconBlock
-	finalizedRoot [32]byte
-	justifiedRoot [32]byte
-}
-
-// notifyForkchoiceUpdate signals execution engine the fork choice updates. Execution engine should:
-// 1. Re-organizes the execution payload chain and corresponding state to make head_block_hash the head.
-// 2. Applies finality to the execution state: it irreversibly persists the chain of all execution payloads and corresponding state, up to and including finalized_block_hash.
-func (s *Service) notifyForkchoiceUpdate(ctx context.Context, arg *notifyForkchoiceUpdateArg) (*enginev1.PayloadIDBytes, error) {
-	ctx, span := trace.StartSpan(ctx, "blockChain.notifyForkchoiceUpdate")
-	defer span.End()
-
-	headBlk := arg.headBlock
-	if headBlk == nil || headBlk.IsNil() || headBlk.Body().IsNil() {
-		return nil, errors.New("nil head block")
-	}
-	// Must not call fork choice updated until the transition conditions are met on the Pow network.
-	isExecutionBlk, err := blocks.IsExecutionBlock(headBlk.Body())
-	if err != nil {
-		return nil, errors.Wrap(err, "could not determine if block is execution block")
-	}
-	if !isExecutionBlk {
-		return nil, nil
-	}
-	headPayload, err := headBlk.Body().ExecutionPayload()
-	if err != nil {
-		return nil, errors.Wrap(err, "could not get execution payload")
-	}
-	finalizedHash, err := s.getPayloadHash(ctx, arg.finalizedRoot)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not get finalized block hash")
-	}
-	justifiedHash, err := s.getPayloadHash(ctx, arg.justifiedRoot)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not get justified block hash")
-	}
-	fcs := &enginev1.ForkchoiceState{
-		HeadBlockHash:      headPayload.BlockHash,
-		SafeBlockHash:      justifiedHash,
-		FinalizedBlockHash: finalizedHash,
-	}
-
-	nextSlot := s.CurrentSlot() + 1 // Cache payload ID for next slot proposer.
-	hasAttr, attr, proposerId, err := s.getPayloadAttribute(ctx, arg.headState, nextSlot)
-	if err != nil {
-		return nil, errors.Wrap(err, "could not get payload attribute")
-	}
-
-	payloadID, lastValidHash, err := s.cfg.ExecutionEngineCaller.ForkchoiceUpdated(ctx, fcs, attr)
-	if err != nil {
-		switch err {
-		case powchain.ErrAcceptedSyncingPayloadStatus:
-			forkchoiceUpdatedOptimisticNodeCount.Inc()
-			log.WithFields(logrus.Fields{
-				"headSlot":                  headBlk.Slot(),
-				"headPayloadBlockHash":      fmt.Sprintf("%#x", bytesutil.Trunc(headPayload.BlockHash)),
-				"finalizedPayloadBlockHash": fmt.Sprintf("%#x", bytesutil.Trunc(finalizedHash)),
-			}).Info("Called fork choice updated with optimistic block")
-			return payloadID, s.optimisticCandidateBlock(ctx, headBlk)
-		case powchain.ErrInvalidPayloadStatus:
-			headRoot := arg.headRoot
-			invalidRoots, err := s.ForkChoicer().SetOptimisticToInvalid(ctx, headRoot, bytesutil.ToBytes32(headBlk.ParentRoot()), bytesutil.ToBytes32(lastValidHash))
-			if err != nil {
-				return nil, err
-			}
-			if err := s.removeInvalidBlockAndState(ctx, invalidRoots); err != nil {
-				return nil, err
-			}
-			log.WithFields(logrus.Fields{
-				"slot":         headBlk.Slot(),
-				"blockRoot":    fmt.Sprintf("%#x", headRoot),
-				"invalidCount": len(invalidRoots),
-			}).Warn("Pruned invalid blocks")
-			return nil, ErrInvalidPayload
-		default:
-			return nil, errors.WithMessage(ErrUndefinedExecutionEngineError, err.Error())
-		}
-	}
-	forkchoiceUpdatedValidNodeCount.Inc()
-	if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, arg.headRoot); err != nil {
-		return nil, errors.Wrap(err, "could not set block to valid")
-	}
-	if hasAttr { // If the forkchoice update call has an attribute, update the proposer payload ID cache.
-		var pId [8]byte
-		copy(pId[:], payloadID[:])
-		s.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(nextSlot, proposerId, pId)
-	}
-	return payloadID, nil
-}
-
-// getPayloadHash returns the payload hash given the block root.
-// if the block is before bellatrix fork epoch, it returns the zero hash.
-func (s *Service) getPayloadHash(ctx context.Context, root [32]byte) ([]byte, error) {
-	finalizedBlock, err := s.getBlock(ctx, s.ensureRootNotZeros(root))
-	if err != nil {
-		return nil, err
-	}
-	if blocks.IsPreBellatrixVersion(finalizedBlock.Block().Version()) {
-		return params.BeaconConfig().ZeroHash[:], nil
-	}
-	payload, err := finalizedBlock.Block().Body().ExecutionPayload()
-	if err != nil {
-		return nil, errors.Wrap(err, "could not get execution payload")
-	}
-	return payload.BlockHash, nil
-}
-
-// notifyForkchoiceUpdate signals execution engine on a new payload.
-// It returns true if the EL has returned VALID for the block
-func (s *Service) notifyNewPayload(ctx context.Context, postStateVersion int,
-	postStateHeader *ethpb.ExecutionPayloadHeader, blk interfaces.SignedBeaconBlock) (bool, error) {
-	ctx, span := trace.StartSpan(ctx, "blockChain.notifyNewPayload")
-	defer span.End()
-
-	// Execution payload is only supported in Bellatrix and beyond. Pre
-	// merge blocks are never optimistic
-	if blocks.IsPreBellatrixVersion(postStateVersion) {
-		return true, nil
-	}
-	if err := helpers.BeaconBlockIsNil(blk); err != nil {
-		return false, err
-	}
-	body := blk.Block().Body()
-	enabled, err := blocks.IsExecutionEnabledUsingHeader(postStateHeader, body)
-	if err != nil {
-		return false, errors.Wrap(err, "could not determine if execution is enabled")
-	}
-	if !enabled {
-		return true, nil
-	}
-	payload, err := body.ExecutionPayload()
-	if err != nil {
-		return false, errors.Wrap(err, "could not get execution payload")
-	}
-	lastValidHash, err := s.cfg.ExecutionEngineCaller.NewPayload(ctx, payload)
-	switch err {
-	case nil:
-		newPayloadValidNodeCount.Inc()
-		return true, nil
-	case powchain.ErrAcceptedSyncingPayloadStatus:
-		newPayloadOptimisticNodeCount.Inc()
-		log.WithFields(logrus.Fields{
-			"slot":             blk.Block().Slot(),
-			"payloadBlockHash": fmt.Sprintf("%#x", bytesutil.Trunc(payload.BlockHash)),
-		}).Info("Called new payload with optimistic block")
-		return false, s.optimisticCandidateBlock(ctx, blk.Block())
-	case powchain.ErrInvalidPayloadStatus:
-		newPayloadInvalidNodeCount.Inc()
-		root, err := blk.Block().HashTreeRoot()
-		if err != nil {
-			return false, err
-		}
-		invalidRoots, err := s.ForkChoicer().SetOptimisticToInvalid(ctx, root, bytesutil.ToBytes32(blk.Block().ParentRoot()), bytesutil.ToBytes32(lastValidHash))
-		if err != nil {
-			return false, err
-		}
-		if err := s.removeInvalidBlockAndState(ctx, invalidRoots); err != nil {
-			return false, err
-		}
-		log.WithFields(logrus.Fields{
-			"slot":         blk.Block().Slot(),
-			"blockRoot":    fmt.Sprintf("%#x", root),
-			"invalidCount": len(invalidRoots),
-		}).Warn("Pruned invalid blocks")
-		return false, ErrInvalidPayload
-	default:
-		return false, errors.WithMessage(ErrUndefinedExecutionEngineError, err.Error())
-	}
-}
-
-// optimisticCandidateBlock returns an error if this block can't be optimistically synced.
-// It replaces boolean in spec code with `errNotOptimisticCandidate`.
-//
-// Spec pseudocode definition:
-// def is_optimistic_candidate_block(opt_store: OptimisticStore, current_slot: Slot, block: BeaconBlock) -> bool:
-//    if is_execution_block(opt_store.blocks[block.parent_root]):
-//        return True
-//
-//    if block.slot + SAFE_SLOTS_TO_IMPORT_OPTIMISTICALLY <= current_slot:
-//        return True
-//
-//    return False
-func (s *Service) optimisticCandidateBlock(ctx context.Context, blk interfaces.BeaconBlock) error {
-	if blk.Slot()+params.BeaconConfig().SafeSlotsToImportOptimistically <= s.CurrentSlot() {
-		return nil
-	}
-
-	parent, err := s.cfg.BeaconDB.Block(ctx, bytesutil.ToBytes32(blk.ParentRoot()))
-	if err != nil {
-		return err
-	}
-	if parent == nil || parent.IsNil() {
-		return errNilParentInDB
-	}
-	parentIsExecutionBlock, err := blocks.IsExecutionBlock(parent.Block().Body())
-	if err != nil {
-		return err
-	}
-	if parentIsExecutionBlock {
-		return nil
-	}
-
-	return errNotOptimisticCandidate
-}
-
-// getPayloadAttributes returns the payload attributes for the given state and slot.
-// The attribute is required to initiate a payload build process in the context of an `engine_forkchoiceUpdated` call.
-func (s *Service) getPayloadAttribute(ctx context.Context, st state.BeaconState, slot types.Slot) (bool, *enginev1.PayloadAttributes, types.ValidatorIndex, error) {
-	proposerID, _, ok := s.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(slot)
-	if !ok { // There's no need to build attribute if there is no proposer for slot.
-		return false, nil, 0, nil
-	}
-
-	// Get previous randao.
-	st = st.Copy()
-	st, err := transition.ProcessSlotsIfPossible(ctx, st, slot)
-	if err != nil {
-		return false, nil, 0, err
-	}
-	prevRando, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
-	if err != nil {
-		return false, nil, 0, nil
-	}
-
-	// Get fee recipient.
-	feeRecipient := params.BeaconConfig().DefaultFeeRecipient
-	recipient, err := s.cfg.BeaconDB.FeeRecipientByValidatorID(ctx, proposerID)
-	switch {
-	case errors.Is(err, kv.ErrNotFoundFeeRecipient):
-		if feeRecipient.String() == fieldparams.EthBurnAddressHex {
-			logrus.WithFields(logrus.Fields{
-				"validatorIndex": proposerID,
-				"burnAddress":    fieldparams.EthBurnAddressHex,
-			}).Error("Fee recipient not set. Using burn address")
-		}
-	case err != nil:
-		return false, nil, 0, errors.Wrap(err, "could not get fee recipient in db")
-	default:
-		feeRecipient = recipient
-	}
-
-	// Get timestamp.
-	t, err := slots.ToTime(uint64(s.genesisTime.Unix()), slot)
-	if err != nil {
-		return false, nil, 0, err
-	}
-	attr := &enginev1.PayloadAttributes{
-		Timestamp:             uint64(t.Unix()),
-		PrevRandao:            prevRando,
-		SuggestedFeeRecipient: feeRecipient.Bytes(),
-	}
-	return true, attr, proposerID, nil
-}
-
-// removeInvalidBlockAndState removes the invalid block and its corresponding state from the cache and DB.
-func (s *Service) removeInvalidBlockAndState(ctx context.Context, blkRoots [][32]byte) error {
-	for _, root := range blkRoots {
-		if err := s.cfg.StateGen.DeleteStateFromCaches(ctx, root); err != nil {
-			return err
-		}
-
-		// Delete block also deletes the state as well.
-		if err := s.cfg.BeaconDB.DeleteBlock(ctx, root); err != nil {
-			// TODO(10487): If a caller requests to delete a root that's justified and finalized. We should gracefully shutdown.
-			// This is an irreparable condition, it would me a justified or finalized block has become invalid.
-			return err
-		}
-	}
-	return nil
-}
--- a/beacon-chain/blockchain/head.go
+++ b/beacon-chain/blockchain/head.go
@@ -6,6 +6,7 @@ import (
 	"fmt"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
 	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
@@ -15,18 +16,16 @@ import (
 	"github.com/prysmaticlabs/prysm/config/features"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpbv1 "github.com/prysmaticlabs/prysm/proto/eth/v1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/time/slots"
 	"github.com/sirupsen/logrus"
 	"go.opencensus.io/trace"
 )

-// UpdateAndSaveHeadWithBalances updates the beacon state head after getting justified balanced from cache.
-// This function is only used in spec-tests, it does save the head after updating it.
-func (s *Service) UpdateAndSaveHeadWithBalances(ctx context.Context) error {
+// UpdateHeadWithBalances updates the beacon state head after getting justified balanced from cache.
+func (s *Service) UpdateHeadWithBalances(ctx context.Context) error {
 	cp := s.store.JustifiedCheckpt()
 	if cp == nil {
 		return errors.New("no justified checkpoint")
@@ -36,43 +35,32 @@ func (s *Service) UpdateAndSaveHeadWithBalances(ctx context.Context) error {
 		msg := fmt.Sprintf("could not read balances for state w/ justified checkpoint %#x", cp.Root)
 		return errors.Wrap(err, msg)
 	}
-	headRoot, err := s.updateHead(ctx, balances)
-	if err != nil {
-		return errors.Wrap(err, "could not update head")
-	}
-	headBlock, err := s.cfg.BeaconDB.Block(ctx, headRoot)
-	if err != nil {
-		return err
-	}
-	headState, err := s.cfg.StateGen.StateByRoot(ctx, headRoot)
-	if err != nil {
-		return errors.Wrap(err, "could not retrieve head state in DB")
-	}
-	return s.saveHead(ctx, headRoot, headBlock, headState)
+
+	return s.updateHead(ctx, balances)
 }

 // This defines the current chain service's view of head.
 type head struct {
-	slot  types.Slot                   // current head slot.
-	root  [32]byte                     // current head root.
-	block interfaces.SignedBeaconBlock // current head block.
-	state state.BeaconState            // current head state.
+	slot  types.Slot              // current head slot.
+	root  [32]byte                // current head root.
+	block block.SignedBeaconBlock // current head block.
+	state state.BeaconState       // current head state.
 }

 // Determined the head from the fork choice service and saves its new data
 // (head root, head block, and head state) to the local service cache.
-func (s *Service) updateHead(ctx context.Context, balances []uint64) ([32]byte, error) {
+func (s *Service) updateHead(ctx context.Context, balances []uint64) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.updateHead")
 	defer span.End()

 	// Get head from the fork choice service.
 	f := s.store.FinalizedCheckpt()
 	if f == nil {
-		return [32]byte{}, errNilFinalizedInStore
+		return errNilFinalizedInStore
 	}
 	j := s.store.JustifiedCheckpt()
 	if j == nil {
-		return [32]byte{}, errNilJustifiedInStore
+		return errNilJustifiedInStore
 	}
 	// To get head before the first justified epoch, the fork choice will start with origin root
 	// instead of zero hashes.
@@ -88,7 +76,7 @@ func (s *Service) updateHead(ctx context.Context, balances []uint64) ([32]byte,
 	if !s.cfg.ForkChoiceStore.HasNode(headStartRoot) {
 		jb, err := s.cfg.BeaconDB.Block(ctx, headStartRoot)
 		if err != nil {
-			return [32]byte{}, err
+			return err
 		}
 		if features.Get().EnableForkChoiceDoublyLinkedTree {
 			s.cfg.ForkChoiceStore = doublylinkedtree.New(j.Epoch, f.Epoch)
@@ -96,16 +84,22 @@ func (s *Service) updateHead(ctx context.Context, balances []uint64) ([32]byte,
 			s.cfg.ForkChoiceStore = protoarray.New(j.Epoch, f.Epoch, bytesutil.ToBytes32(f.Root))
 		}
 		if err := s.insertBlockToForkChoiceStore(ctx, jb.Block(), headStartRoot, f, j); err != nil {
-			return [32]byte{}, err
+			return err
 		}
 	}

-	return s.cfg.ForkChoiceStore.Head(ctx, j.Epoch, headStartRoot, balances, f.Epoch)
+	headRoot, err := s.cfg.ForkChoiceStore.Head(ctx, j.Epoch, headStartRoot, balances, f.Epoch)
+	if err != nil {
+		return err
+	}
+
+	// Save head to the local service cache.
+	return s.saveHead(ctx, headRoot)
 }

 // This saves head info to the local service cache, it also saves the
 // new head root to the DB.
-func (s *Service) saveHead(ctx context.Context, headRoot [32]byte, headBlock interfaces.SignedBeaconBlock, headState state.BeaconState) error {
+func (s *Service) saveHead(ctx context.Context, headRoot [32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.saveHead")
 	defer span.End()

@@ -117,12 +111,6 @@ func (s *Service) saveHead(ctx context.Context, headRoot [32]byte, headBlock int
 	if headRoot == bytesutil.ToBytes32(r) {
 		return nil
 	}
-	if err := helpers.BeaconBlockIsNil(headBlock); err != nil {
-		return err
-	}
-	if headState == nil || headState.IsNil() {
-		return errors.New("cannot save nil head state")
-	}

 	// If the head state is not available, just return nil.
 	// There's nothing to cache
@@ -130,13 +118,31 @@ func (s *Service) saveHead(ctx context.Context, headRoot [32]byte, headBlock int
 		return nil
 	}

+	// Get the new head block from DB.
+	newHeadBlock, err := s.cfg.BeaconDB.Block(ctx, headRoot)
+	if err != nil {
+		return err
+	}
+	if err := helpers.BeaconBlockIsNil(newHeadBlock); err != nil {
+		return err
+	}
+
+	// Get the new head state from cached state or DB.
+	newHeadState, err := s.cfg.StateGen.StateByRoot(ctx, headRoot)
+	if err != nil {
+		return errors.Wrap(err, "could not retrieve head state in DB")
+	}
+	if newHeadState == nil || newHeadState.IsNil() {
+		return errors.New("cannot save nil head state")
+	}
+
 	// A chain re-org occurred, so we fire an event notifying the rest of the services.
 	headSlot := s.HeadSlot()
-	newHeadSlot := headBlock.Block().Slot()
+	newHeadSlot := newHeadBlock.Block().Slot()
 	oldHeadRoot := s.headRoot()
 	oldStateRoot := s.headBlock().Block().StateRoot()
-	newStateRoot := headBlock.Block().StateRoot()
-	if bytesutil.ToBytes32(headBlock.Block().ParentRoot()) != bytesutil.ToBytes32(r) {
+	newStateRoot := newHeadBlock.Block().StateRoot()
+	if bytesutil.ToBytes32(newHeadBlock.Block().ParentRoot()) != bytesutil.ToBytes32(r) {
 		log.WithFields(logrus.Fields{
 			"newSlot": fmt.Sprintf("%d", newHeadSlot),
 			"oldSlot": fmt.Sprintf("%d", headSlot),
@@ -168,7 +174,7 @@ func (s *Service) saveHead(ctx context.Context, headRoot [32]byte, headBlock int
 	}

 	// Cache the new head info.
-	s.setHead(headRoot, headBlock, headState)
+	s.setHead(headRoot, newHeadBlock, newHeadState)

 	// Save the new head root to DB.
 	if err := s.cfg.BeaconDB.SaveHeadBlockRoot(ctx, headRoot); err != nil {
@@ -178,7 +184,7 @@ func (s *Service) saveHead(ctx context.Context, headRoot [32]byte, headBlock int
 	// Forward an event capturing a new chain head over a common event feed
 	// done in a goroutine to avoid blocking the critical runtime main routine.
 	go func() {
-		if err := s.notifyNewHeadEvent(ctx, newHeadSlot, headState, newStateRoot, headRoot[:]); err != nil {
+		if err := s.notifyNewHeadEvent(ctx, newHeadSlot, newHeadState, newStateRoot, headRoot[:]); err != nil {
 			log.WithError(err).Error("Could not notify event feed of new chain head")
 		}
 	}()
@@ -189,7 +195,7 @@ func (s *Service) saveHead(ctx context.Context, headRoot [32]byte, headBlock int
 // This gets called to update canonical root mapping. It does not save head block
 // root in DB. With the inception of initial-sync-cache-state flag, it uses finalized
 // check point as anchors to resume sync therefore head is no longer needed to be saved on per slot basis.
-func (s *Service) saveHeadNoDB(ctx context.Context, b interfaces.SignedBeaconBlock, r [32]byte, hs state.BeaconState) error {
+func (s *Service) saveHeadNoDB(ctx context.Context, b block.SignedBeaconBlock, r [32]byte, hs state.BeaconState) error {
 	if err := helpers.BeaconBlockIsNil(b); err != nil {
 		return err
 	}
@@ -206,7 +212,7 @@ func (s *Service) saveHeadNoDB(ctx context.Context, b interfaces.SignedBeaconBlo
 }

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

@@ -222,7 +228,7 @@ func (s *Service) setHead(root [32]byte, block interfaces.SignedBeaconBlock, sta
 // This sets head view object which is used to track the head slot, root, block and state. The method
 // assumes that state being passed into the method will not be modified by any other alternate
 // caller which holds the state's reference.
-func (s *Service) setHeadInitialSync(root [32]byte, block interfaces.SignedBeaconBlock, state state.BeaconState) {
+func (s *Service) setHeadInitialSync(root [32]byte, block block.SignedBeaconBlock, state state.BeaconState) {
 	s.headLock.Lock()
 	defer s.headLock.Unlock()

@@ -255,7 +261,7 @@ func (s *Service) headRoot() [32]byte {
 // This returns the head block.
 // It does a full copy on head block for immutability.
 // This is a lock free version.
-func (s *Service) headBlock() interfaces.SignedBeaconBlock {
+func (s *Service) headBlock() block.SignedBeaconBlock {
 	return s.head.block.Copy()
 }

@@ -355,6 +361,10 @@ func (s *Service) notifyNewHeadEvent(
 // attestation pool. It also filters out the attestations that is one epoch older as a
 // defense so invalid attestations don't flow into the attestation pool.
 func (s *Service) saveOrphanedAtts(ctx context.Context, orphanedRoot [32]byte) error {
+	if !features.Get().CorrectlyInsertOrphanedAtts {
+		return nil
+	}
+
 	orphanedBlk, err := s.cfg.BeaconDB.Block(ctx, orphanedRoot)
 	if err != nil {
 		return err
--- a/beacon-chain/blockchain/head_sync_committee_info.go
+++ b/beacon-chain/blockchain/head_sync_committee_info.go
@@ -5,6 +5,7 @@ import (
 	"fmt"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/async"
 	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/altair"
@@ -13,7 +14,6 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/transition"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/time/slots"
 )
--- a/beacon-chain/blockchain/head_sync_committee_info_test.go
+++ b/beacon-chain/blockchain/head_sync_committee_info_test.go
@@ -4,12 +4,12 @@ import (
 	"context"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/signing"
 	dbtest "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
 	"github.com/prysmaticlabs/prysm/time/slots"
--- a/beacon-chain/blockchain/head_test.go
+++ b/beacon-chain/blockchain/head_test.go
@@ -6,15 +6,14 @@ import (
 	"testing"
 	"time"

+	types "github.com/prysmaticlabs/eth2-types"
 	mock "github.com/prysmaticlabs/prysm/beacon-chain/blockchain/testing"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
-	doublylinkedtree "github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/doubly-linked-tree"
-	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
+	"github.com/prysmaticlabs/prysm/config/features"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	ethpbv1 "github.com/prysmaticlabs/prysm/proto/eth/v1"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
@@ -28,10 +27,8 @@ func TestSaveHead_Same(t *testing.T) {

 	r := [32]byte{'A'}
 	service.head = &head{slot: 0, root: r}
-	b, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlock())
-	require.NoError(t, err)
-	st, _ := util.DeterministicGenesisState(t, 1)
-	require.NoError(t, service.saveHead(context.Background(), r, b, st))
+
+	require.NoError(t, service.saveHead(context.Background(), r))
 	assert.Equal(t, types.Slot(0), service.headSlot(), "Head did not stay the same")
 	assert.Equal(t, r, service.headRoot(), "Head did not stay the same")
 }
@@ -69,7 +66,7 @@ func TestSaveHead_Different(t *testing.T) {
 	require.NoError(t, headState.SetSlot(1))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Slot: 1, Root: newRoot[:]}))
 	require.NoError(t, service.cfg.BeaconDB.SaveState(context.Background(), headState, newRoot))
-	require.NoError(t, service.saveHead(context.Background(), newRoot, wsb, headState))
+	require.NoError(t, service.saveHead(context.Background(), newRoot))

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

@@ -115,7 +112,7 @@ func TestSaveHead_Different_Reorg(t *testing.T) {
 	require.NoError(t, headState.SetSlot(1))
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(context.Background(), &ethpb.StateSummary{Slot: 1, Root: newRoot[:]}))
 	require.NoError(t, service.cfg.BeaconDB.SaveState(context.Background(), headState, newRoot))
-	require.NoError(t, service.saveHead(context.Background(), newRoot, wsb, headState))
+	require.NoError(t, service.saveHead(context.Background(), newRoot))

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

@@ -157,10 +154,8 @@ func TestUpdateHead_MissingJustifiedRoot(t *testing.T) {
 	service.store.SetJustifiedCheckpt(&ethpb.Checkpoint{Root: r[:]})
 	service.store.SetFinalizedCheckpt(&ethpb.Checkpoint{})
 	service.store.SetBestJustifiedCheckpt(&ethpb.Checkpoint{})
-	headRoot, err := service.updateHead(context.Background(), []uint64{})
-	require.NoError(t, err)
-	st, _ := util.DeterministicGenesisState(t, 1)
-	require.NoError(t, service.saveHead(context.Background(), headRoot, wsb, st))
+
+	require.NoError(t, service.updateHead(context.Background(), []uint64{}))
 }

 func Test_notifyNewHeadEvent(t *testing.T) {
@@ -230,6 +225,11 @@ func Test_notifyNewHeadEvent(t *testing.T) {
 }

 func TestSaveOrphanedAtts(t *testing.T) {
+	resetCfg := features.InitWithReset(&features.Flags{
+		CorrectlyInsertOrphanedAtts: true,
+	})
+	defer resetCfg()
+
 	genesis, keys := util.DeterministicGenesisState(t, 64)
 	b, err := util.GenerateFullBlock(genesis, keys, util.DefaultBlockGenConfig(), 1)
 	assert.NoError(t, err)
@@ -253,6 +253,11 @@ func TestSaveOrphanedAtts(t *testing.T) {
 }

 func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
+	resetCfg := features.InitWithReset(&features.Flags{
+		CorrectlyInsertOrphanedAtts: true,
+	})
+	defer resetCfg()
+
 	genesis, keys := util.DeterministicGenesisState(t, 64)
 	b, err := util.GenerateFullBlock(genesis, keys, util.DefaultBlockGenConfig(), 1)
 	assert.NoError(t, err)
@@ -274,43 +279,3 @@ func TestSaveOrphanedAtts_CanFilter(t *testing.T) {
 	atts := b.Block.Body.Attestations
 	require.DeepNotSSZEqual(t, atts, savedAtts)
 }
-
-func TestUpdateHead_noSavedChanges(t *testing.T) {
-	ctx := context.Background()
-
-	beaconDB := testDB.SetupDB(t)
-	fcs := doublylinkedtree.New(0, 0)
-	opts := []Option{
-		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB)),
-		WithForkChoiceStore(fcs),
-	}
-
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-
-	bellatrixBlk, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlockBellatrix())
-	require.NoError(t, err)
-	bellatrixBlkRoot, err := bellatrixBlk.Block().HashTreeRoot()
-	require.NoError(t, err)
-	require.NoError(t, beaconDB.SaveBlock(ctx, bellatrixBlk))
-	fcp := &ethpb.Checkpoint{
-		Root:  bellatrixBlkRoot[:],
-		Epoch: 1,
-	}
-	service.store.SetFinalizedCheckpt(fcp)
-	service.store.SetJustifiedCheckpt(fcp)
-	require.NoError(t, beaconDB.SaveGenesisBlockRoot(ctx, bellatrixBlkRoot))
-
-	bellatrixState, _ := util.DeterministicGenesisStateBellatrix(t, 2)
-	require.NoError(t, beaconDB.SaveState(ctx, bellatrixState, bellatrixBlkRoot))
-	service.cfg.StateGen.SaveFinalizedState(0, bellatrixBlkRoot, bellatrixState)
-
-	headRoot := service.headRoot()
-	require.Equal(t, [32]byte{}, headRoot)
-
-	newRoot, err := service.updateHead(ctx, []uint64{1, 2})
-	require.NoError(t, err)
-	require.NotEqual(t, headRoot, newRoot)
-	require.Equal(t, headRoot, service.headRoot())
-}
--- a/beacon-chain/blockchain/init_sync_process_block.go
+++ b/beacon-chain/blockchain/init_sync_process_block.go
@@ -1,17 +1,11 @@
 package blockchain

 import (
-	"context"
-
-	"github.com/pkg/errors"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 )

-var errBlockNotFoundInCacheOrDB = errors.New("block not found in cache or db")
-
 // This saves a beacon block to the initial sync blocks cache.
-func (s *Service) saveInitSyncBlock(r [32]byte, b interfaces.SignedBeaconBlock) {
+func (s *Service) saveInitSyncBlock(r [32]byte, b block.SignedBeaconBlock) {
 	s.initSyncBlocksLock.Lock()
 	defer s.initSyncBlocksLock.Unlock()
 	s.initSyncBlocks[r] = b
@@ -26,42 +20,22 @@ func (s *Service) hasInitSyncBlock(r [32]byte) bool {
 	return ok
 }

-// Returns true if a block for root `r` exists in the initial sync blocks cache or the DB.
-func (s *Service) hasBlockInInitSyncOrDB(ctx context.Context, r [32]byte) bool {
-	if s.hasInitSyncBlock(r) {
-		return true
-	}
-	return s.cfg.BeaconDB.HasBlock(ctx, r)
-}
-
-// Returns block for a given root `r` from either the initial sync blocks cache or the DB.
-// Error is returned if the block is not found in either cache or DB.
-func (s *Service) getBlock(ctx context.Context, r [32]byte) (interfaces.SignedBeaconBlock, error) {
+// This retrieves a beacon block from the initial sync blocks cache using the root of
+// the block.
+func (s *Service) getInitSyncBlock(r [32]byte) block.SignedBeaconBlock {
 	s.initSyncBlocksLock.RLock()
-
-	// Check cache first because it's faster.
-	b, ok := s.initSyncBlocks[r]
-	s.initSyncBlocksLock.RUnlock()
-	var err error
-	if !ok {
-		b, err = s.cfg.BeaconDB.Block(ctx, r)
-		if err != nil {
-			return nil, errors.Wrap(err, "could not retrieve block from db")
-		}
-	}
-	if err := helpers.BeaconBlockIsNil(b); err != nil {
-		return nil, errBlockNotFoundInCacheOrDB
-	}
-	return b, nil
+	defer s.initSyncBlocksLock.RUnlock()
+	b := s.initSyncBlocks[r]
+	return b
 }

 // This retrieves all the beacon blocks from the initial sync blocks cache, the returned
 // blocks are unordered.
-func (s *Service) getInitSyncBlocks() []interfaces.SignedBeaconBlock {
+func (s *Service) getInitSyncBlocks() []block.SignedBeaconBlock {
 	s.initSyncBlocksLock.RLock()
 	defer s.initSyncBlocksLock.RUnlock()

-	blks := make([]interfaces.SignedBeaconBlock, 0, len(s.initSyncBlocks))
+	blks := make([]block.SignedBeaconBlock, 0, len(s.initSyncBlocks))
 	for _, b := range s.initSyncBlocks {
 		blks = append(blks, b)
 	}
@@ -72,5 +46,5 @@ func (s *Service) getInitSyncBlocks() []interfaces.SignedBeaconBlock {
 func (s *Service) clearInitSyncBlocks() {
 	s.initSyncBlocksLock.Lock()
 	defer s.initSyncBlocksLock.Unlock()
-	s.initSyncBlocks = make(map[[32]byte]interfaces.SignedBeaconBlock)
+	s.initSyncBlocks = make(map[[32]byte]block.SignedBeaconBlock)
 }
--- a/beacon-chain/blockchain/init_sync_process_block_test.go
+++ b/beacon-chain/blockchain/init_sync_process_block_test.go
@@ -1,72 +0,0 @@
-package blockchain
-
-import (
-	"context"
-	"testing"
-
-	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
-	"github.com/prysmaticlabs/prysm/testing/require"
-	"github.com/prysmaticlabs/prysm/testing/util"
-)
-
-func TestService_getBlock(t *testing.T) {
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-	s := setupBeaconChain(t, beaconDB)
-	b1 := util.NewBeaconBlock()
-	r1, err := b1.Block.HashTreeRoot()
-	require.NoError(t, err)
-	b2 := util.NewBeaconBlock()
-	b2.Block.Slot = 100
-	r2, err := b2.Block.HashTreeRoot()
-	require.NoError(t, err)
-
-	// block not found
-	_, err = s.getBlock(ctx, [32]byte{})
-	require.ErrorIs(t, err, errBlockNotFoundInCacheOrDB)
-
-	// block in cache
-	b, err := wrapper.WrappedSignedBeaconBlock(b1)
-	require.NoError(t, err)
-	s.saveInitSyncBlock(r1, b)
-	got, err := s.getBlock(ctx, r1)
-	require.NoError(t, err)
-	require.DeepEqual(t, b, got)
-
-	// block in db
-	b, err = wrapper.WrappedSignedBeaconBlock(b2)
-	require.NoError(t, err)
-	require.NoError(t, s.cfg.BeaconDB.SaveBlock(ctx, b))
-	got, err = s.getBlock(ctx, r2)
-	require.NoError(t, err)
-	require.DeepEqual(t, b, got)
-}
-
-func TestService_hasBlockInInitSyncOrDB(t *testing.T) {
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-	s := setupBeaconChain(t, beaconDB)
-	b1 := util.NewBeaconBlock()
-	r1, err := b1.Block.HashTreeRoot()
-	require.NoError(t, err)
-	b2 := util.NewBeaconBlock()
-	b2.Block.Slot = 100
-	r2, err := b2.Block.HashTreeRoot()
-	require.NoError(t, err)
-
-	// block not found
-	require.Equal(t, false, s.hasBlockInInitSyncOrDB(ctx, [32]byte{}))
-
-	// block in cache
-	b, err := wrapper.WrappedSignedBeaconBlock(b1)
-	require.NoError(t, err)
-	s.saveInitSyncBlock(r1, b)
-	require.Equal(t, true, s.hasBlockInInitSyncOrDB(ctx, r1))
-
-	// block in db
-	b, err = wrapper.WrappedSignedBeaconBlock(b2)
-	require.NoError(t, err)
-	require.NoError(t, s.cfg.BeaconDB.SaveBlock(ctx, b))
-	require.Equal(t, true, s.hasBlockInInitSyncOrDB(ctx, r2))
-}
--- a/beacon-chain/blockchain/log.go
+++ b/beacon-chain/blockchain/log.go
@@ -6,9 +6,9 @@ import (
 	"time"

 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/runtime/version"
 	prysmTime "github.com/prysmaticlabs/prysm/time"
 	"github.com/prysmaticlabs/prysm/time/slots"
@@ -18,7 +18,7 @@ import (
 var log = logrus.WithField("prefix", "blockchain")

 // logs state transition related data every slot.
-func logStateTransitionData(b interfaces.BeaconBlock) error {
+func logStateTransitionData(b block.BeaconBlock) error {
 	log := log.WithField("slot", b.Slot())
 	if len(b.Body().Attestations()) > 0 {
 		log = log.WithField("attestations", len(b.Body().Attestations()))
@@ -54,7 +54,7 @@ func logStateTransitionData(b interfaces.BeaconBlock) error {
 	return nil
 }

-func logBlockSyncStatus(block interfaces.BeaconBlock, blockRoot [32]byte, finalized *ethpb.Checkpoint, receivedTime time.Time, genesisTime uint64) error {
+func logBlockSyncStatus(block block.BeaconBlock, blockRoot [32]byte, finalized *ethpb.Checkpoint, receivedTime time.Time, genesisTime uint64) error {
 	startTime, err := slots.ToTime(genesisTime, block.Slot())
 	if err != nil {
 		return err
--- a/beacon-chain/blockchain/log_test.go
+++ b/beacon-chain/blockchain/log_test.go
@@ -3,10 +3,10 @@ package blockchain
 import (
 	"testing"

-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	enginev1 "github.com/prysmaticlabs/prysm/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	logTest "github.com/sirupsen/logrus/hooks/test"
 )
@@ -25,85 +25,57 @@ func Test_logStateTransitionData(t *testing.T) {
 	require.NoError(t, err)
 	tests := []struct {
 		name string
-		b    func() interfaces.BeaconBlock
+		b    block.BeaconBlock
 		want string
 	}{
 		{name: "empty block body",
-			b: func() interfaces.BeaconBlock {
-				wb, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}})
-				require.NoError(t, err)
-				return wb
-			},
+			b:    wrapper.WrappedPhase0BeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}}),
 			want: "\"Finished applying state transition\" prefix=blockchain slot=0",
 		},
 		{name: "has attestation",
-			b: func() interfaces.BeaconBlock {
-				wb, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{Attestations: []*ethpb.Attestation{{}}}})
-				require.NoError(t, err)
-				return wb
-			},
+			b:    wrapper.WrappedPhase0BeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{Attestations: []*ethpb.Attestation{{}}}}),
 			want: "\"Finished applying state transition\" attestations=1 prefix=blockchain slot=0",
 		},
 		{name: "has deposit",
-			b: func() interfaces.BeaconBlock {
-				wb, err := wrapper.WrappedBeaconBlock(
-					&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
-						Attestations: []*ethpb.Attestation{{}},
-						Deposits:     []*ethpb.Deposit{{}}}})
-				require.NoError(t, err)
-				return wb
-			},
+			b: wrapper.WrappedPhase0BeaconBlock(
+				&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
+					Attestations: []*ethpb.Attestation{{}},
+					Deposits:     []*ethpb.Deposit{{}}}}),
 			want: "\"Finished applying state transition\" attestations=1 deposits=1 prefix=blockchain slot=0",
 		},
 		{name: "has attester slashing",
-			b: func() interfaces.BeaconBlock {
-				wb, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
-					AttesterSlashings: []*ethpb.AttesterSlashing{{}}}})
-				require.NoError(t, err)
-				return wb
-			},
+			b: wrapper.WrappedPhase0BeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
+				AttesterSlashings: []*ethpb.AttesterSlashing{{}}}}),
 			want: "\"Finished applying state transition\" attesterSlashings=1 prefix=blockchain slot=0",
 		},
 		{name: "has proposer slashing",
-			b: func() interfaces.BeaconBlock {
-				wb, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
-					ProposerSlashings: []*ethpb.ProposerSlashing{{}}}})
-				require.NoError(t, err)
-				return wb
-			},
+			b: wrapper.WrappedPhase0BeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
+				ProposerSlashings: []*ethpb.ProposerSlashing{{}}}}),
 			want: "\"Finished applying state transition\" prefix=blockchain proposerSlashings=1 slot=0",
 		},
 		{name: "has exit",
-			b: func() interfaces.BeaconBlock {
-				wb, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
-					VoluntaryExits: []*ethpb.SignedVoluntaryExit{{}}}})
-				require.NoError(t, err)
-				return wb
-			},
+			b: wrapper.WrappedPhase0BeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
+				VoluntaryExits: []*ethpb.SignedVoluntaryExit{{}}}}),
 			want: "\"Finished applying state transition\" prefix=blockchain slot=0 voluntaryExits=1",
 		},
 		{name: "has everything",
-			b: func() interfaces.BeaconBlock {
-				wb, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
-					Attestations:      []*ethpb.Attestation{{}},
-					Deposits:          []*ethpb.Deposit{{}},
-					AttesterSlashings: []*ethpb.AttesterSlashing{{}},
-					ProposerSlashings: []*ethpb.ProposerSlashing{{}},
-					VoluntaryExits:    []*ethpb.SignedVoluntaryExit{{}}}})
-				require.NoError(t, err)
-				return wb
-			},
+			b: wrapper.WrappedPhase0BeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{
+				Attestations:      []*ethpb.Attestation{{}},
+				Deposits:          []*ethpb.Deposit{{}},
+				AttesterSlashings: []*ethpb.AttesterSlashing{{}},
+				ProposerSlashings: []*ethpb.ProposerSlashing{{}},
+				VoluntaryExits:    []*ethpb.SignedVoluntaryExit{{}}}}),
 			want: "\"Finished applying state transition\" attestations=1 attesterSlashings=1 deposits=1 prefix=blockchain proposerSlashings=1 slot=0 voluntaryExits=1",
 		},
 		{name: "has payload",
-			b:    func() interfaces.BeaconBlock { return wrappedPayloadBlk },
+			b:    wrappedPayloadBlk,
 			want: "\"Finished applying state transition\" payloadHash=0x010203 prefix=blockchain slot=0 syncBitsCount=0 txCount=2",
 		},
 	}
 	for _, tt := range tests {
 		hook := logTest.NewGlobal()
 		t.Run(tt.name, func(t *testing.T) {
-			require.NoError(t, logStateTransitionData(tt.b()))
+			require.NoError(t, logStateTransitionData(tt.b))
 			require.LogsContain(t, hook, tt.want)
 		})
 	}
--- a/beacon-chain/blockchain/metrics.go
+++ b/beacon-chain/blockchain/metrics.go
@@ -6,14 +6,14 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/altair"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/runtime/version"
 )

@@ -138,26 +138,6 @@ var (
 		Name: "state_balance_cache_miss",
 		Help: "Count the number of state balance cache hits.",
 	})
-	newPayloadValidNodeCount = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "new_payload_valid_node_count",
-		Help: "Count the number of valid nodes after newPayload EE call",
-	})
-	newPayloadOptimisticNodeCount = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "new_payload_optimistic_node_count",
-		Help: "Count the number of optimistic nodes after newPayload EE call",
-	})
-	newPayloadInvalidNodeCount = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "new_payload_invalid_node_count",
-		Help: "Count the number of invalid nodes after newPayload EE call",
-	})
-	forkchoiceUpdatedValidNodeCount = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "forkchoice_updated_valid_node_count",
-		Help: "Count the number of valid nodes after forkchoiceUpdated EE call",
-	})
-	forkchoiceUpdatedOptimisticNodeCount = promauto.NewCounter(prometheus.CounterOpts{
-		Name: "forkchoice_updated_optimistic_node_count",
-		Help: "Count the number of optimistic nodes after forkchoiceUpdated EE call",
-	})
 )

 // reportSlotMetrics reports slot related metrics.
@@ -298,7 +278,7 @@ func reportEpochMetrics(ctx context.Context, postState, headState state.BeaconSt
 	return nil
 }

-func reportAttestationInclusion(blk interfaces.BeaconBlock) {
+func reportAttestationInclusion(blk block.BeaconBlock) {
 	for _, att := range blk.Body().Attestations() {
 		attestationInclusionDelay.Observe(float64(blk.Slot() - att.Data.Slot))
 	}
--- a/beacon-chain/blockchain/mock_engine_test.go
+++ b/beacon-chain/blockchain/mock_engine_test.go
@@ -0,0 +1,49 @@
+package blockchain
+
+import (
+	"context"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/pkg/errors"
+	enginev1 "github.com/prysmaticlabs/prysm/proto/engine/v1"
+)
+
+type mockEngineService struct {
+	newPayloadError error
+	forkchoiceError error
+	blks            map[[32]byte]*enginev1.ExecutionBlock
+}
+
+func (m *mockEngineService) NewPayload(context.Context, *enginev1.ExecutionPayload) ([]byte, error) {
+	return nil, m.newPayloadError
+}
+
+func (m *mockEngineService) ForkchoiceUpdated(context.Context, *enginev1.ForkchoiceState, *enginev1.PayloadAttributes) (*enginev1.PayloadIDBytes, []byte, error) {
+	return nil, nil, m.forkchoiceError
+}
+
+func (*mockEngineService) GetPayloadV1(
+	_ context.Context, _ enginev1.PayloadIDBytes,
+) *enginev1.ExecutionPayload {
+	return nil
+}
+
+func (*mockEngineService) GetPayload(context.Context, [8]byte) (*enginev1.ExecutionPayload, error) {
+	return nil, nil
+}
+
+func (*mockEngineService) ExchangeTransitionConfiguration(context.Context, *enginev1.TransitionConfiguration) error {
+	return nil
+}
+
+func (*mockEngineService) LatestExecutionBlock(context.Context) (*enginev1.ExecutionBlock, error) {
+	return nil, nil
+}
+
+func (m *mockEngineService) ExecutionBlockByHash(_ context.Context, hash common.Hash) (*enginev1.ExecutionBlock, error) {
+	blk, ok := m.blks[common.BytesToHash(hash.Bytes())]
+	if !ok {
+		return nil, errors.New("block not found")
+	}
+	return blk, nil
+}
--- a/beacon-chain/blockchain/new_slot.go
+++ b/beacon-chain/blockchain/new_slot.go
@@ -5,7 +5,7 @@ import (
 	"context"

 	"github.com/pkg/errors"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/time/slots"
 )

--- a/beacon-chain/blockchain/new_slot_test.go
+++ b/beacon-chain/blockchain/new_slot_test.go
@@ -4,12 +4,12 @@ import (
 	"context"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain/store"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/require"
@@ -86,9 +86,9 @@ func TestService_newSlot(t *testing.T) {
 	for _, test := range tests {
 		service, err := NewService(ctx, opts...)
 		require.NoError(t, err)
-		s := store.New(test.args.justified, test.args.finalized)
-		s.SetBestJustifiedCheckpt(test.args.bestJustified)
-		service.store = s
+		store := store.New(test.args.justified, test.args.finalized)
+		store.SetBestJustifiedCheckpt(test.args.bestJustified)
+		service.store = store

 		require.NoError(t, service.NewSlot(ctx, test.args.slot))
 		if test.args.shouldEqual {
--- a/beacon-chain/blockchain/optimistic_sync.go
+++ b/beacon-chain/blockchain/optimistic_sync.go
@@ -0,0 +1,189 @@
+package blockchain
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/pkg/errors"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	v1 "github.com/prysmaticlabs/prysm/beacon-chain/powchain/engine-api-client/v1"
+	"github.com/prysmaticlabs/prysm/config/params"
+	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
+	enginev1 "github.com/prysmaticlabs/prysm/proto/engine/v1"
+	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
+	"github.com/sirupsen/logrus"
+	"go.opencensus.io/trace"
+)
+
+// notifyForkchoiceUpdate signals execution engine the fork choice updates. Execution engine should:
+// 1. Re-organizes the execution payload chain and corresponding state to make head_block_hash the head.
+// 2. Applies finality to the execution state: it irreversibly persists the chain of all execution payloads and corresponding state, up to and including finalized_block_hash.
+func (s *Service) notifyForkchoiceUpdate(ctx context.Context, headBlk block.BeaconBlock, headRoot [32]byte, finalizedRoot [32]byte) (*enginev1.PayloadIDBytes, error) {
+	ctx, span := trace.StartSpan(ctx, "blockChain.notifyForkchoiceUpdate")
+	defer span.End()
+
+	if headBlk == nil || headBlk.IsNil() || headBlk.Body().IsNil() {
+		return nil, errors.New("nil head block")
+	}
+	// Must not call fork choice updated until the transition conditions are met on the Pow network.
+	isExecutionBlk, err := blocks.IsExecutionBlock(headBlk.Body())
+	if err != nil {
+		return nil, errors.Wrap(err, "could not determine if block is execution block")
+	}
+	if !isExecutionBlk {
+		return nil, nil
+	}
+	headPayload, err := headBlk.Body().ExecutionPayload()
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get execution payload")
+	}
+	finalizedBlock, err := s.cfg.BeaconDB.Block(ctx, s.ensureRootNotZeros(finalizedRoot))
+	if err != nil {
+		return nil, errors.Wrap(err, "could not get finalized block")
+	}
+	var finalizedHash []byte
+	if blocks.IsPreBellatrixVersion(finalizedBlock.Block().Version()) {
+		finalizedHash = params.BeaconConfig().ZeroHash[:]
+	} else {
+		payload, err := finalizedBlock.Block().Body().ExecutionPayload()
+		if err != nil {
+			return nil, errors.Wrap(err, "could not get finalized block execution payload")
+		}
+		finalizedHash = payload.BlockHash
+	}
+
+	fcs := &enginev1.ForkchoiceState{
+		HeadBlockHash:      headPayload.BlockHash,
+		SafeBlockHash:      headPayload.BlockHash,
+		FinalizedBlockHash: finalizedHash,
+	}
+
+	// payload attribute is only required when requesting payload, here we are just updating fork choice, so it is nil.
+	payloadID, _, err := s.cfg.ExecutionEngineCaller.ForkchoiceUpdated(ctx, fcs, nil /*payload attribute*/)
+	if err != nil {
+		switch err {
+		case v1.ErrAcceptedSyncingPayloadStatus:
+			log.WithFields(logrus.Fields{
+				"headSlot":      headBlk.Slot(),
+				"headHash":      fmt.Sprintf("%#x", bytesutil.Trunc(headPayload.BlockHash)),
+				"finalizedHash": fmt.Sprintf("%#x", bytesutil.Trunc(finalizedHash)),
+			}).Info("Called fork choice updated with optimistic block")
+			return payloadID, nil
+		default:
+			return nil, errors.Wrap(err, "could not notify forkchoice update from execution engine")
+		}
+	}
+	if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, headRoot); err != nil {
+		return nil, errors.Wrap(err, "could not set block to valid")
+	}
+	return payloadID, nil
+}
+
+// notifyForkchoiceUpdate signals execution engine on a new payload
+func (s *Service) notifyNewPayload(ctx context.Context, preStateVersion, postStateVersion int,
+	preStateHeader, postStateHeader *ethpb.ExecutionPayloadHeader, blk block.SignedBeaconBlock, root [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "blockChain.notifyNewPayload")
+	defer span.End()
+
+	// Execution payload is only supported in Bellatrix and beyond. Pre
+	// merge blocks are never optimistic
+	if blocks.IsPreBellatrixVersion(postStateVersion) {
+		return s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, root)
+	}
+	if err := helpers.BeaconBlockIsNil(blk); err != nil {
+		return err
+	}
+	body := blk.Block().Body()
+	enabled, err := blocks.IsExecutionEnabledUsingHeader(postStateHeader, body)
+	if err != nil {
+		return errors.Wrap(err, "could not determine if execution is enabled")
+	}
+	if !enabled {
+		return s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, root)
+	}
+	payload, err := body.ExecutionPayload()
+	if err != nil {
+		return errors.Wrap(err, "could not get execution payload")
+	}
+	_, err = s.cfg.ExecutionEngineCaller.NewPayload(ctx, payload)
+	if err != nil {
+		switch err {
+		case v1.ErrAcceptedSyncingPayloadStatus:
+			log.WithFields(logrus.Fields{
+				"slot":      blk.Block().Slot(),
+				"blockHash": fmt.Sprintf("%#x", bytesutil.Trunc(payload.BlockHash)),
+			}).Info("Called new payload with optimistic block")
+			return nil
+		default:
+			return errors.Wrap(err, "could not validate execution payload from execution engine")
+		}
+	}
+
+	if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, root); err != nil {
+		return errors.Wrap(err, "could not set optimistic status")
+	}
+
+	// During the transition event, the transition block should be verified for sanity.
+	if blocks.IsPreBellatrixVersion(preStateVersion) {
+		// Handle case where pre-state is Altair but block contains payload.
+		// To reach here, the block must have contained a valid payload.
+		return s.validateMergeBlock(ctx, blk)
+	}
+	atTransition, err := blocks.IsMergeTransitionBlockUsingPreStatePayloadHeader(preStateHeader, body)
+	if err != nil {
+		return errors.Wrap(err, "could not check if merge block is terminal")
+	}
+	if !atTransition {
+		return nil
+	}
+	return s.validateMergeBlock(ctx, blk)
+}
+
+// optimisticCandidateBlock returns true if this block can be optimistically synced.
+//
+// Spec pseudocode definition:
+// def is_optimistic_candidate_block(opt_store: OptimisticStore, current_slot: Slot, block: BeaconBlock) -> bool:
+//    if is_execution_block(opt_store.blocks[block.parent_root]):
+//        return True
+//
+//    justified_root = opt_store.block_states[opt_store.head_block_root].current_justified_checkpoint.root
+//    if is_execution_block(opt_store.blocks[justified_root]):
+//        return True
+//
+//    if block.slot + SAFE_SLOTS_TO_IMPORT_OPTIMISTICALLY <= current_slot:
+//        return True
+//
+//    return False
+func (s *Service) optimisticCandidateBlock(ctx context.Context, blk block.BeaconBlock) (bool, error) {
+	if blk.Slot()+params.BeaconConfig().SafeSlotsToImportOptimistically <= s.CurrentSlot() {
+		return true, nil
+	}
+
+	parent, err := s.cfg.BeaconDB.Block(ctx, bytesutil.ToBytes32(blk.ParentRoot()))
+	if err != nil {
+		return false, err
+	}
+	if parent == nil {
+		return false, errNilParentInDB
+	}
+
+	parentIsExecutionBlock, err := blocks.IsExecutionBlock(parent.Block().Body())
+	if err != nil {
+		return false, err
+	}
+	if parentIsExecutionBlock {
+		return true, nil
+	}
+
+	j := s.store.JustifiedCheckpt()
+	if j == nil {
+		return false, errNilJustifiedInStore
+	}
+	jBlock, err := s.cfg.BeaconDB.Block(ctx, bytesutil.ToBytes32(j.Root))
+	if err != nil {
+		return false, err
+	}
+	return blocks.IsExecutionBlock(jBlock.Block().Body())
+}
--- a/beacon-chain/blockchain/execution_engine_test.go
+++ b/beacon-chain/blockchain/execution_engine_test.go
@@ -5,28 +5,24 @@ import (
 	"testing"
 	"time"

-	"github.com/ethereum/go-ethereum/common"
-	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
-	"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
-	mockPOW "github.com/prysmaticlabs/prysm/beacon-chain/powchain/testing"
+	engine "github.com/prysmaticlabs/prysm/beacon-chain/powchain/engine-api-client/v1"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	v1 "github.com/prysmaticlabs/prysm/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
+	"github.com/prysmaticlabs/prysm/runtime/version"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
 	"github.com/prysmaticlabs/prysm/time/slots"
-	logTest "github.com/sirupsen/logrus/hooks/test"
 )

 func Test_NotifyForkchoiceUpdate(t *testing.T) {
@@ -47,23 +43,15 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		WithDatabase(beaconDB),
 		WithStateGen(stategen.New(beaconDB)),
 		WithForkChoiceStore(fcs),
-		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
 	}
 	service, err := NewService(ctx, opts...)
-	st, _ := util.DeterministicGenesisState(t, 1)
-	service.head = &head{
-		state: st,
-	}
 	require.NoError(t, err)
 	require.NoError(t, fcs.InsertOptimisticBlock(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, 0, 0))
-	require.NoError(t, fcs.InsertOptimisticBlock(ctx, 1, [32]byte{'a'}, [32]byte{}, params.BeaconConfig().ZeroHash, 0, 0))

 	tests := []struct {
 		name             string
-		blk              interfaces.BeaconBlock
-		headRoot         [32]byte
+		blk              block.BeaconBlock
 		finalizedRoot    [32]byte
-		justifiedRoot    [32]byte
 		newForkchoiceErr error
 		errString        string
 	}{
@@ -73,7 +61,7 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		},
 		{
 			name: "phase0 block",
-			blk: func() interfaces.BeaconBlock {
+			blk: func() block.BeaconBlock {
 				b, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}})
 				require.NoError(t, err)
 				return b
@@ -81,7 +69,7 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		},
 		{
 			name: "altair block",
-			blk: func() interfaces.BeaconBlock {
+			blk: func() block.BeaconBlock {
 				b, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlockAltair{Body: &ethpb.BeaconBlockBodyAltair{}})
 				require.NoError(t, err)
 				return b
@@ -89,7 +77,7 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		},
 		{
 			name: "not execution block",
-			blk: func() interfaces.BeaconBlock {
+			blk: func() block.BeaconBlock {
 				b, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{
@@ -110,7 +98,7 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 		},
 		{
 			name: "happy case: finalized root is altair block",
-			blk: func() interfaces.BeaconBlock {
+			blk: func() block.BeaconBlock {
 				b, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{},
@@ -120,11 +108,10 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 				return b
 			}(),
 			finalizedRoot: altairBlkRoot,
-			justifiedRoot: altairBlkRoot,
 		},
 		{
 			name: "happy case: finalized root is bellatrix block",
-			blk: func() interfaces.BeaconBlock {
+			blk: func() block.BeaconBlock {
 				b, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{},
@@ -134,11 +121,10 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 				return b
 			}(),
 			finalizedRoot: bellatrixBlkRoot,
-			justifiedRoot: bellatrixBlkRoot,
 		},
 		{
 			name: "forkchoice updated with optimistic block",
-			blk: func() interfaces.BeaconBlock {
+			blk: func() block.BeaconBlock {
 				b, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{},
@@ -147,13 +133,12 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 				require.NoError(t, err)
 				return b
 			}(),
-			newForkchoiceErr: powchain.ErrAcceptedSyncingPayloadStatus,
+			newForkchoiceErr: engine.ErrAcceptedSyncingPayloadStatus,
 			finalizedRoot:    bellatrixBlkRoot,
-			justifiedRoot:    bellatrixBlkRoot,
 		},
 		{
 			name: "forkchoice updated with invalid block",
-			blk: func() interfaces.BeaconBlock {
+			blk: func() block.BeaconBlock {
 				b, err := wrapper.WrappedBeaconBlock(&ethpb.BeaconBlockBellatrix{
 					Body: &ethpb.BeaconBlockBodyBellatrix{
 						ExecutionPayload: &v1.ExecutionPayload{},
@@ -162,26 +147,17 @@ func Test_NotifyForkchoiceUpdate(t *testing.T) {
 				require.NoError(t, err)
 				return b
 			}(),
-			newForkchoiceErr: powchain.ErrInvalidPayloadStatus,
+			newForkchoiceErr: engine.ErrInvalidPayloadStatus,
 			finalizedRoot:    bellatrixBlkRoot,
-			justifiedRoot:    bellatrixBlkRoot,
-			headRoot:         [32]byte{'a'},
-			errString:        ErrInvalidPayload.Error(),
+			errString:        "could not notify forkchoice update from execution engine: payload status is INVALID",
 		},
 	}

 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			service.cfg.ExecutionEngineCaller = &mockPOW.EngineClient{ErrForkchoiceUpdated: tt.newForkchoiceErr}
-			st, _ := util.DeterministicGenesisState(t, 1)
-			arg := &notifyForkchoiceUpdateArg{
-				headState:     st,
-				headRoot:      tt.headRoot,
-				headBlock:     tt.blk,
-				finalizedRoot: tt.finalizedRoot,
-				justifiedRoot: tt.justifiedRoot,
-			}
-			_, err := service.notifyForkchoiceUpdate(ctx, arg)
+			engine := &mockEngineService{forkchoiceError: tt.newForkchoiceErr}
+			service.cfg.ExecutionEngineCaller = engine
+			_, err := service.notifyForkchoiceUpdate(ctx, tt.blk, service.headRoot(), tt.finalizedRoot)
 			if tt.errString != "" {
 				require.ErrorContains(t, tt.errString, err)
 			} else {
@@ -207,6 +183,13 @@ func Test_NotifyNewPayload(t *testing.T) {
 	phase0State, _ := util.DeterministicGenesisState(t, 1)
 	altairState, _ := util.DeterministicGenesisStateAltair(t, 1)
 	bellatrixState, _ := util.DeterministicGenesisStateBellatrix(t, 2)
+	blk := &ethpb.SignedBeaconBlockBellatrix{
+		Block: &ethpb.BeaconBlockBellatrix{
+			Body: &ethpb.BeaconBlockBodyBellatrix{
+				ExecutionPayload: &v1.ExecutionPayload{},
+			},
+		},
+	}
 	a := &ethpb.SignedBeaconBlockAltair{
 		Block: &ethpb.BeaconBlockAltair{
 			Body: &ethpb.BeaconBlockBodyAltair{},
@@ -214,82 +197,61 @@ func Test_NotifyNewPayload(t *testing.T) {
 	}
 	altairBlk, err := wrapper.WrappedSignedBeaconBlock(a)
 	require.NoError(t, err)
-	blk := &ethpb.SignedBeaconBlockBellatrix{
-		Block: &ethpb.BeaconBlockBellatrix{
-			Slot: 1,
-			Body: &ethpb.BeaconBlockBodyBellatrix{
-				ExecutionPayload: &v1.ExecutionPayload{
-					BlockNumber:   1,
-					ParentHash:    make([]byte, fieldparams.RootLength),
-					FeeRecipient:  make([]byte, fieldparams.FeeRecipientLength),
-					StateRoot:     make([]byte, fieldparams.RootLength),
-					ReceiptsRoot:  make([]byte, fieldparams.RootLength),
-					LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
-					PrevRandao:    make([]byte, fieldparams.RootLength),
-					BaseFeePerGas: make([]byte, fieldparams.RootLength),
-					BlockHash:     make([]byte, fieldparams.RootLength),
-				},
-			},
-		},
-	}
-	bellatrixBlk, err := wrapper.WrappedSignedBeaconBlock(util.HydrateSignedBeaconBlockBellatrix(blk))
+	bellatrixBlk, err := wrapper.WrappedSignedBeaconBlock(blk)
 	require.NoError(t, err)
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	r, err := bellatrixBlk.Block().HashTreeRoot()
-	require.NoError(t, err)
-	require.NoError(t, fcs.InsertOptimisticBlock(ctx, 0, [32]byte{}, [32]byte{}, params.BeaconConfig().ZeroHash, 0, 0))
-	require.NoError(t, fcs.InsertOptimisticBlock(ctx, 1, r, [32]byte{}, params.BeaconConfig().ZeroHash, 0, 0))

 	tests := []struct {
-		name           string
-		postState      state.BeaconState
-		isValidPayload bool
-		blk            interfaces.SignedBeaconBlock
-		newPayloadErr  error
-		errString      string
+		name          string
+		preState      state.BeaconState
+		postState     state.BeaconState
+		blk           block.SignedBeaconBlock
+		newPayloadErr error
+		errString     string
 	}{
 		{
-			name:           "phase 0 post state",
-			postState:      phase0State,
-			isValidPayload: true,
+			name:      "phase 0 post state",
+			postState: phase0State,
+			preState:  phase0State,
 		},
 		{
-			name:           "altair post state",
-			postState:      altairState,
-			isValidPayload: true,
+			name:      "altair post state",
+			postState: altairState,
+			preState:  altairState,
 		},
 		{
-			name:           "nil beacon block",
-			postState:      bellatrixState,
-			errString:      "signed beacon block can't be nil",
-			isValidPayload: false,
+			name:      "nil beacon block",
+			postState: bellatrixState,
+			preState:  bellatrixState,
+			errString: "signed beacon block can't be nil",
 		},
 		{
-			name:           "new payload with optimistic block",
-			postState:      bellatrixState,
-			blk:            bellatrixBlk,
-			newPayloadErr:  powchain.ErrAcceptedSyncingPayloadStatus,
-			isValidPayload: false,
+			name:          "new payload with optimistic block",
+			postState:     bellatrixState,
+			preState:      bellatrixState,
+			blk:           bellatrixBlk,
+			newPayloadErr: engine.ErrAcceptedSyncingPayloadStatus,
 		},
 		{
-			name:           "new payload with invalid block",
-			postState:      bellatrixState,
-			blk:            bellatrixBlk,
-			newPayloadErr:  powchain.ErrInvalidPayloadStatus,
-			errString:      ErrInvalidPayload.Error(),
-			isValidPayload: false,
+			name:          "new payload with invalid block",
+			postState:     bellatrixState,
+			preState:      bellatrixState,
+			blk:           bellatrixBlk,
+			newPayloadErr: engine.ErrInvalidPayloadStatus,
+			errString:     "could not validate execution payload from execution engine: payload status is INVALID",
 		},
 		{
-			name:           "altair pre state, altair block",
-			postState:      bellatrixState,
-			blk:            altairBlk,
-			isValidPayload: true,
+			name:      "altair pre state, altair block",
+			postState: bellatrixState,
+			preState:  altairState,
+			blk:       altairBlk,
 		},
 		{
 			name:      "altair pre state, happy case",
 			postState: bellatrixState,
-			blk: func() interfaces.SignedBeaconBlock {
+			preState:  altairState,
+			blk: func() block.SignedBeaconBlock {
 				blk := &ethpb.SignedBeaconBlockBellatrix{
 					Block: &ethpb.BeaconBlockBellatrix{
 						Body: &ethpb.BeaconBlockBodyBellatrix{
@@ -303,12 +265,19 @@ func Test_NotifyNewPayload(t *testing.T) {
 				require.NoError(t, err)
 				return b
 			}(),
-			isValidPayload: true,
+		},
+		{
+			name:      "could not get merge block",
+			postState: bellatrixState,
+			preState:  bellatrixState,
+			blk:       bellatrixBlk,
+			errString: "could not get merge block parent hash and total difficulty",
 		},
 		{
 			name:      "not at merge transition",
 			postState: bellatrixState,
-			blk: func() interfaces.SignedBeaconBlock {
+			preState:  bellatrixState,
+			blk: func() block.SignedBeaconBlock {
 				blk := &ethpb.SignedBeaconBlockBellatrix{
 					Block: &ethpb.BeaconBlockBellatrix{
 						Body: &ethpb.BeaconBlockBodyBellatrix{
@@ -329,12 +298,19 @@ func Test_NotifyNewPayload(t *testing.T) {
 				require.NoError(t, err)
 				return b
 			}(),
-			isValidPayload: true,
+		},
+		{
+			name:      "could not get merge block",
+			postState: bellatrixState,
+			preState:  bellatrixState,
+			blk:       bellatrixBlk,
+			errString: "could not get merge block parent hash and total difficulty",
 		},
 		{
 			name:      "happy case",
 			postState: bellatrixState,
-			blk: func() interfaces.SignedBeaconBlock {
+			preState:  bellatrixState,
+			blk: func() block.SignedBeaconBlock {
 				blk := &ethpb.SignedBeaconBlockBellatrix{
 					Block: &ethpb.BeaconBlockBellatrix{
 						Body: &ethpb.BeaconBlockBodyBellatrix{
@@ -348,51 +324,34 @@ func Test_NotifyNewPayload(t *testing.T) {
 				require.NoError(t, err)
 				return b
 			}(),
-			isValidPayload: true,
-		},
-		{
-			name:      "undefined error from ee",
-			postState: bellatrixState,
-			blk: func() interfaces.SignedBeaconBlock {
-				blk := &ethpb.SignedBeaconBlockBellatrix{
-					Block: &ethpb.BeaconBlockBellatrix{
-						Body: &ethpb.BeaconBlockBodyBellatrix{
-							ExecutionPayload: &v1.ExecutionPayload{
-								ParentHash: bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength),
-							},
-						},
-					},
-				}
-				b, err := wrapper.WrappedSignedBeaconBlock(blk)
-				require.NoError(t, err)
-				return b
-			}(),
-			newPayloadErr: ErrUndefinedExecutionEngineError,
-			errString:     ErrUndefinedExecutionEngineError.Error(),
 		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			e := &mockPOW.EngineClient{ErrNewPayload: tt.newPayloadErr, BlockByHashMap: map[[32]byte]*v1.ExecutionBlock{}}
-			e.BlockByHashMap[[32]byte{'a'}] = &v1.ExecutionBlock{
+			engine := &mockEngineService{newPayloadError: tt.newPayloadErr, blks: map[[32]byte]*v1.ExecutionBlock{}}
+			engine.blks[[32]byte{'a'}] = &v1.ExecutionBlock{
 				ParentHash:      bytesutil.PadTo([]byte{'b'}, fieldparams.RootLength),
 				TotalDifficulty: "0x2",
 			}
-			e.BlockByHashMap[[32]byte{'b'}] = &v1.ExecutionBlock{
+			engine.blks[[32]byte{'b'}] = &v1.ExecutionBlock{
 				ParentHash:      bytesutil.PadTo([]byte{'3'}, fieldparams.RootLength),
 				TotalDifficulty: "0x1",
 			}
-			service.cfg.ExecutionEngineCaller = e
+			service.cfg.ExecutionEngineCaller = engine
+			var payload *ethpb.ExecutionPayloadHeader
+			if tt.preState.Version() == version.Bellatrix {
+				payload, err = tt.preState.LatestExecutionPayloadHeader()
+				require.NoError(t, err)
+			}
 			root := [32]byte{'a'}
 			require.NoError(t, service.cfg.ForkChoiceStore.InsertOptimisticBlock(ctx, 0, root, root, params.BeaconConfig().ZeroHash, 0, 0))
 			postVersion, postHeader, err := getStateVersionAndPayload(tt.postState)
 			require.NoError(t, err)
-			isValidPayload, err := service.notifyNewPayload(ctx, postVersion, postHeader, tt.blk)
+			err = service.notifyNewPayload(ctx, tt.preState.Version(), postVersion, payload, postHeader, tt.blk, root)
 			if tt.errString != "" {
 				require.ErrorContains(t, tt.errString, err)
 			} else {
 				require.NoError(t, err)
-				require.Equal(t, tt.isValidPayload, isValidPayload)
 			}
 		})
 	}
@@ -424,21 +383,27 @@ func Test_NotifyNewPayload_SetOptimisticToValid(t *testing.T) {
 	require.NoError(t, err)
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	e := &mockPOW.EngineClient{BlockByHashMap: map[[32]byte]*v1.ExecutionBlock{}}
-	e.BlockByHashMap[[32]byte{'a'}] = &v1.ExecutionBlock{
+	engine := &mockEngineService{blks: map[[32]byte]*v1.ExecutionBlock{}}
+	engine.blks[[32]byte{'a'}] = &v1.ExecutionBlock{
 		ParentHash:      bytesutil.PadTo([]byte{'b'}, fieldparams.RootLength),
 		TotalDifficulty: "0x2",
 	}
-	e.BlockByHashMap[[32]byte{'b'}] = &v1.ExecutionBlock{
+	engine.blks[[32]byte{'b'}] = &v1.ExecutionBlock{
 		ParentHash:      bytesutil.PadTo([]byte{'3'}, fieldparams.RootLength),
 		TotalDifficulty: "0x1",
 	}
-	service.cfg.ExecutionEngineCaller = e
+	service.cfg.ExecutionEngineCaller = engine
+	payload, err := bellatrixState.LatestExecutionPayloadHeader()
+	require.NoError(t, err)
+	root := [32]byte{'c'}
+	require.NoError(t, service.cfg.ForkChoiceStore.InsertOptimisticBlock(ctx, 1, root, [32]byte{'a'}, params.BeaconConfig().ZeroHash, 0, 0))
 	postVersion, postHeader, err := getStateVersionAndPayload(bellatrixState)
 	require.NoError(t, err)
-	validated, err := service.notifyNewPayload(ctx, postVersion, postHeader, bellatrixBlk)
+	err = service.notifyNewPayload(ctx, bellatrixState.Version(), postVersion, payload, postHeader, bellatrixBlk, root)
 	require.NoError(t, err)
-	require.Equal(t, true, validated)
+	optimistic, err := service.IsOptimisticForRoot(ctx, root)
+	require.NoError(t, err)
+	require.Equal(t, false, optimistic)
 }

 func Test_IsOptimisticCandidateBlock(t *testing.T) {
@@ -468,21 +433,21 @@ func Test_IsOptimisticCandidateBlock(t *testing.T) {

 	tests := []struct {
 		name      string
-		blk       interfaces.BeaconBlock
-		justified interfaces.SignedBeaconBlock
-		err       error
+		blk       block.BeaconBlock
+		justified block.SignedBeaconBlock
+		want      bool
 	}{
 		{
 			name: "deep block",
-			blk: func(tt *testing.T) interfaces.BeaconBlock {
+			blk: func(tt *testing.T) block.BeaconBlock {
 				blk := util.NewBeaconBlockBellatrix()
 				blk.Block.Slot = 1
 				blk.Block.ParentRoot = parentRoot[:]
-				wr, err := wrapper.WrappedBeaconBlock(blk.Block)
+				wr, err := wrapper.WrappedBellatrixBeaconBlock(blk.Block)
 				require.NoError(tt, err)
 				return wr
 			}(t),
-			justified: func(tt *testing.T) interfaces.SignedBeaconBlock {
+			justified: func(tt *testing.T) block.SignedBeaconBlock {
 				blk := util.NewBeaconBlockBellatrix()
 				blk.Block.Slot = 32
 				blk.Block.ParentRoot = parentRoot[:]
@@ -490,19 +455,19 @@ func Test_IsOptimisticCandidateBlock(t *testing.T) {
 				require.NoError(tt, err)
 				return wr
 			}(t),
-			err: nil,
+			want: true,
 		},
 		{
 			name: "shallow block, Altair justified chkpt",
-			blk: func(tt *testing.T) interfaces.BeaconBlock {
+			blk: func(tt *testing.T) block.BeaconBlock {
 				blk := util.NewBeaconBlockAltair()
 				blk.Block.Slot = 200
 				blk.Block.ParentRoot = parentRoot[:]
-				wr, err := wrapper.WrappedBeaconBlock(blk.Block)
+				wr, err := wrapper.WrappedAltairBeaconBlock(blk.Block)
 				require.NoError(tt, err)
 				return wr
 			}(t),
-			justified: func(tt *testing.T) interfaces.SignedBeaconBlock {
+			justified: func(tt *testing.T) block.SignedBeaconBlock {
 				blk := util.NewBeaconBlockAltair()
 				blk.Block.Slot = 32
 				blk.Block.ParentRoot = parentRoot[:]
@@ -510,19 +475,19 @@ func Test_IsOptimisticCandidateBlock(t *testing.T) {
 				require.NoError(tt, err)
 				return wr
 			}(t),
-			err: errNotOptimisticCandidate,
+			want: false,
 		},
 		{
 			name: "shallow block, Bellatrix justified chkpt without execution",
-			blk: func(tt *testing.T) interfaces.BeaconBlock {
+			blk: func(tt *testing.T) block.BeaconBlock {
 				blk := util.NewBeaconBlockBellatrix()
 				blk.Block.Slot = 200
 				blk.Block.ParentRoot = parentRoot[:]
-				wr, err := wrapper.WrappedBeaconBlock(blk.Block)
+				wr, err := wrapper.WrappedBellatrixBeaconBlock(blk.Block)
 				require.NoError(tt, err)
 				return wr
 			}(t),
-			justified: func(tt *testing.T) interfaces.SignedBeaconBlock {
+			justified: func(tt *testing.T) block.SignedBeaconBlock {
 				blk := util.NewBeaconBlockBellatrix()
 				blk.Block.Slot = 32
 				blk.Block.ParentRoot = parentRoot[:]
@@ -530,22 +495,51 @@ func Test_IsOptimisticCandidateBlock(t *testing.T) {
 				require.NoError(tt, err)
 				return wr
 			}(t),
-			err: errNotOptimisticCandidate,
+			want: false,
+		},
+		{
+			name: "shallow block, execution enabled justified chkpt",
+			blk: func(tt *testing.T) block.BeaconBlock {
+				blk := util.NewBeaconBlockBellatrix()
+				blk.Block.Slot = 200
+				blk.Block.ParentRoot = parentRoot[:]
+				wr, err := wrapper.WrappedBellatrixBeaconBlock(blk.Block)
+				require.NoError(tt, err)
+				return wr
+			}(t),
+			justified: func(tt *testing.T) block.SignedBeaconBlock {
+				blk := util.NewBeaconBlockBellatrix()
+				blk.Block.Slot = 32
+				blk.Block.ParentRoot = parentRoot[:]
+				blk.Block.Body.ExecutionPayload.ParentHash = bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength)
+				blk.Block.Body.ExecutionPayload.FeeRecipient = bytesutil.PadTo([]byte{'a'}, fieldparams.FeeRecipientLength)
+				blk.Block.Body.ExecutionPayload.StateRoot = bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength)
+				blk.Block.Body.ExecutionPayload.ReceiptsRoot = bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength)
+				blk.Block.Body.ExecutionPayload.LogsBloom = bytesutil.PadTo([]byte{'a'}, fieldparams.LogsBloomLength)
+				blk.Block.Body.ExecutionPayload.PrevRandao = bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength)
+				blk.Block.Body.ExecutionPayload.BaseFeePerGas = bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength)
+				blk.Block.Body.ExecutionPayload.BlockHash = bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength)
+				wr, err := wrapper.WrappedSignedBeaconBlock(blk)
+				require.NoError(tt, err)
+				return wr
+			}(t),
+			want: true,
 		},
 	}
 	for _, tt := range tests {
-		jRoot, err := tt.justified.Block().HashTreeRoot()
+		jroot, err := tt.justified.Block().HashTreeRoot()
 		require.NoError(t, err)
 		require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, tt.justified))
 		service.store.SetJustifiedCheckpt(
 			&ethpb.Checkpoint{
-				Root:  jRoot[:],
+				Root:  jroot[:],
 				Epoch: slots.ToEpoch(tt.justified.Block().Slot()),
 			})
 		require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wrappedParentBlock))

-		err = service.optimisticCandidateBlock(ctx, tt.blk)
-		require.Equal(t, tt.err, err)
+		candidate, err := service.optimisticCandidateBlock(ctx, tt.blk)
+		require.NoError(t, err)
+		require.Equal(t, tt.want, candidate, tt.name)
 	}
 }

@@ -577,8 +571,8 @@ func Test_IsOptimisticShallowExecutionParent(t *testing.T) {
 		BlockNumber:   100,
 	}
 	body := &ethpb.BeaconBlockBodyBellatrix{ExecutionPayload: payload}
-	b := &ethpb.BeaconBlockBellatrix{Body: body, Slot: 200}
-	rawSigned := &ethpb.SignedBeaconBlockBellatrix{Block: b}
+	block := &ethpb.BeaconBlockBellatrix{Body: body, Slot: 200}
+	rawSigned := &ethpb.SignedBeaconBlockBellatrix{Block: block}
 	blk := util.HydrateSignedBeaconBlockBellatrix(rawSigned)
 	wr, err := wrapper.WrappedSignedBeaconBlock(blk)
 	require.NoError(t, err)
@@ -593,49 +587,9 @@ func Test_IsOptimisticShallowExecutionParent(t *testing.T) {
 	wrappedChild, err := wrapper.WrappedSignedBeaconBlock(childBlock)
 	require.NoError(t, err)
 	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wrappedChild))
-	err = service.optimisticCandidateBlock(ctx, wrappedChild.Block())
+	candidate, err := service.optimisticCandidateBlock(ctx, wrappedChild.Block())
 	require.NoError(t, err)
-}
-
-func Test_GetPayloadAttribute(t *testing.T) {
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-	opts := []Option{
-		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB)),
-		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
-	}
-
-	// Cache miss
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-	hasPayload, _, vId, err := service.getPayloadAttribute(ctx, nil, 0)
-	require.NoError(t, err)
-	require.Equal(t, false, hasPayload)
-	require.Equal(t, types.ValidatorIndex(0), vId)
-
-	// Cache hit, advance state, no fee recipient
-	suggestedVid := types.ValidatorIndex(1)
-	slot := types.Slot(1)
-	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{})
-	st, _ := util.DeterministicGenesisState(t, 1)
-	hook := logTest.NewGlobal()
-	hasPayload, attr, vId, err := service.getPayloadAttribute(ctx, st, slot)
-	require.NoError(t, err)
-	require.Equal(t, true, hasPayload)
-	require.Equal(t, suggestedVid, vId)
-	require.Equal(t, fieldparams.EthBurnAddressHex, common.BytesToAddress(attr.SuggestedFeeRecipient).String())
-	require.LogsContain(t, hook, "Fee recipient not set. Using burn address")
-
-	// Cache hit, advance state, has fee recipient
-	suggestedAddr := common.HexToAddress("123")
-	require.NoError(t, service.cfg.BeaconDB.SaveFeeRecipientsByValidatorIDs(ctx, []types.ValidatorIndex{suggestedVid}, []common.Address{suggestedAddr}))
-	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(slot, suggestedVid, [8]byte{})
-	hasPayload, attr, vId, err = service.getPayloadAttribute(ctx, st, slot)
-	require.NoError(t, err)
-	require.Equal(t, true, hasPayload)
-	require.Equal(t, suggestedVid, vId)
-	require.Equal(t, suggestedAddr, common.BytesToAddress(attr.SuggestedFeeRecipient))
+	require.Equal(t, true, candidate)
 }

 func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
@@ -653,6 +607,7 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	}
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
+
 	genesisStateRoot := [32]byte{}
 	genesisBlk := blocks.NewGenesisBlock(genesisStateRoot[:])
 	wr, err := wrapper.WrappedSignedBeaconBlock(genesisBlk)
@@ -735,98 +690,3 @@ func Test_UpdateLastValidatedCheckpoint(t *testing.T) {
 	require.DeepEqual(t, validCheckpoint.Root, cp.Root)
 	require.Equal(t, validCheckpoint.Epoch, cp.Epoch)
 }
-
-func TestService_removeInvalidBlockAndState(t *testing.T) {
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-	opts := []Option{
-		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB)),
-		WithForkChoiceStore(protoarray.New(0, 0, [32]byte{})),
-	}
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-
-	// Deleting unknown block should not error.
-	require.NoError(t, service.removeInvalidBlockAndState(ctx, [][32]byte{{'a'}, {'b'}, {'c'}}))
-
-	// Happy case
-	b1 := util.NewBeaconBlock()
-	b1.Block.Slot = 1
-	blk1, err := wrapper.WrappedSignedBeaconBlock(b1)
-	require.NoError(t, err)
-	r1, err := blk1.Block().HashTreeRoot()
-	require.NoError(t, err)
-	st, _ := util.DeterministicGenesisStateBellatrix(t, 1)
-	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, blk1))
-	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{
-		Slot: 1,
-		Root: r1[:],
-	}))
-	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, st, r1))
-
-	b2 := util.NewBeaconBlock()
-	b2.Block.Slot = 2
-	blk2, err := wrapper.WrappedSignedBeaconBlock(b2)
-	require.NoError(t, err)
-	r2, err := blk2.Block().HashTreeRoot()
-	require.NoError(t, err)
-	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, blk2))
-	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{
-		Slot: 2,
-		Root: r2[:],
-	}))
-	require.NoError(t, service.cfg.BeaconDB.SaveState(ctx, st, r2))
-
-	require.NoError(t, service.removeInvalidBlockAndState(ctx, [][32]byte{r1, 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)
-	require.NoError(t, err)
-	require.Equal(t, false, has)
-	has, err = service.cfg.StateGen.HasState(ctx, r2)
-	require.NoError(t, err)
-	require.Equal(t, false, has)
-}
-
-func TestService_getPayloadHash(t *testing.T) {
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-	opts := []Option{
-		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB)),
-		WithForkChoiceStore(protoarray.New(0, 0, [32]byte{})),
-	}
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-
-	_, err = service.getPayloadHash(ctx, [32]byte{})
-	require.ErrorIs(t, errBlockNotFoundInCacheOrDB, err)
-
-	b := util.NewBeaconBlock()
-	r, err := b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	wsb, err := wrapper.WrappedSignedBeaconBlock(b)
-	require.NoError(t, err)
-	service.saveInitSyncBlock(r, wsb)
-
-	h, err := service.getPayloadHash(ctx, r)
-	require.NoError(t, err)
-	require.DeepEqual(t, params.BeaconConfig().ZeroHash[:], h)
-
-	bb := util.NewBeaconBlockBellatrix()
-	h = []byte{'a'}
-	bb.Block.Body.ExecutionPayload.BlockHash = h
-	r, err = b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	wsb, err = wrapper.WrappedSignedBeaconBlock(bb)
-	require.NoError(t, err)
-	service.saveInitSyncBlock(r, wsb)
-
-	h, err = service.getPayloadHash(ctx, r)
-	require.NoError(t, err)
-	require.DeepEqual(t, []byte{'a'}, h)
-}
--- a/beacon-chain/blockchain/options.go
+++ b/beacon-chain/blockchain/options.go
@@ -2,7 +2,6 @@ package blockchain

 import (
 	"github.com/prysmaticlabs/prysm/async/event"
-	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/beacon-chain/cache/depositcache"
 	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/db"
@@ -12,6 +11,7 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/operations/voluntaryexits"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
+	enginev1 "github.com/prysmaticlabs/prysm/beacon-chain/powchain/engine-api-client/v1"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
@@ -52,7 +52,7 @@ func WithChainStartFetcher(f powchain.ChainStartFetcher) Option {
 }

 // WithExecutionEngineCaller to call execution engine.
-func WithExecutionEngineCaller(c powchain.EngineCaller) Option {
+func WithExecutionEngineCaller(c enginev1.Caller) Option {
 	return func(s *Service) error {
 		s.cfg.ExecutionEngineCaller = c
 		return nil
@@ -67,14 +67,6 @@ func WithDepositCache(c *depositcache.DepositCache) Option {
 	}
 }

-// WithProposerIdsCache for proposer id cache.
-func WithProposerIdsCache(c *cache.ProposerPayloadIDsCache) Option {
-	return func(s *Service) error {
-		s.cfg.ProposerSlotIndexCache = c
-		return nil
-	}
-}
-
 // WithAttestationPool for attestation lifecycle after chain inclusion.
 func WithAttestationPool(p attestations.Pool) Option {
 	return func(s *Service) error {
--- a/beacon-chain/blockchain/pow_block.go
+++ b/beacon-chain/blockchain/pow_block.go
@@ -10,12 +10,12 @@ import (
 	"github.com/ethereum/go-ethereum/common/hexutil"
 	"github.com/holiman/uint256"
 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	enginev1 "github.com/prysmaticlabs/prysm/proto/engine/v1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/time/slots"
 	"github.com/sirupsen/logrus"
 )
@@ -37,7 +37,7 @@ import (
 //    assert pow_parent is not None
 //    # Check if `pow_block` is a valid terminal PoW block
 //    assert is_valid_terminal_pow_block(pow_block, pow_parent)
-func (s *Service) validateMergeBlock(ctx context.Context, b interfaces.SignedBeaconBlock) error {
+func (s *Service) validateMergeBlock(ctx context.Context, b block.SignedBeaconBlock) error {
 	if err := helpers.BeaconBlockIsNil(b); err != nil {
 		return err
 	}
--- a/beacon-chain/blockchain/pow_block_test.go
+++ b/beacon-chain/blockchain/pow_block_test.go
@@ -9,14 +9,13 @@ import (
 	"github.com/holiman/uint256"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
-	mocks "github.com/prysmaticlabs/prysm/beacon-chain/powchain/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	enginev1 "github.com/prysmaticlabs/prysm/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/require"
 )

@@ -118,13 +117,13 @@ func Test_validateMergeBlock(t *testing.T) {
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)

-	engine := &mocks.EngineClient{BlockByHashMap: map[[32]byte]*enginev1.ExecutionBlock{}}
+	engine := &mockEngineService{blks: map[[32]byte]*enginev1.ExecutionBlock{}}
 	service.cfg.ExecutionEngineCaller = engine
-	engine.BlockByHashMap[[32]byte{'a'}] = &enginev1.ExecutionBlock{
+	engine.blks[[32]byte{'a'}] = &enginev1.ExecutionBlock{
 		ParentHash:      bytesutil.PadTo([]byte{'b'}, fieldparams.RootLength),
 		TotalDifficulty: "0x2",
 	}
-	engine.BlockByHashMap[[32]byte{'b'}] = &enginev1.ExecutionBlock{
+	engine.blks[[32]byte{'b'}] = &enginev1.ExecutionBlock{
 		ParentHash:      bytesutil.PadTo([]byte{'3'}, fieldparams.RootLength),
 		TotalDifficulty: "0x1",
 	}
@@ -159,12 +158,12 @@ func Test_getBlkParentHashAndTD(t *testing.T) {
 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)

-	engine := &mocks.EngineClient{BlockByHashMap: map[[32]byte]*enginev1.ExecutionBlock{}}
+	engine := &mockEngineService{blks: map[[32]byte]*enginev1.ExecutionBlock{}}
 	service.cfg.ExecutionEngineCaller = engine
 	h := [32]byte{'a'}
 	p := [32]byte{'b'}
 	td := "0x1"
-	engine.BlockByHashMap[h] = &enginev1.ExecutionBlock{
+	engine.blks[h] = &enginev1.ExecutionBlock{
 		ParentHash:      p[:],
 		TotalDifficulty: td,
 	}
@@ -176,18 +175,18 @@ func Test_getBlkParentHashAndTD(t *testing.T) {
 	_, _, err = service.getBlkParentHashAndTD(ctx, []byte{'c'})
 	require.ErrorContains(t, "could not get pow block: block not found", err)

-	engine.BlockByHashMap[h] = nil
+	engine.blks[h] = nil
 	_, _, err = service.getBlkParentHashAndTD(ctx, h[:])
 	require.ErrorContains(t, "pow block is nil", err)

-	engine.BlockByHashMap[h] = &enginev1.ExecutionBlock{
+	engine.blks[h] = &enginev1.ExecutionBlock{
 		ParentHash:      p[:],
 		TotalDifficulty: "1",
 	}
 	_, _, err = service.getBlkParentHashAndTD(ctx, h[:])
 	require.ErrorContains(t, "could not decode merge block total difficulty: hex string without 0x prefix", err)

-	engine.BlockByHashMap[h] = &enginev1.ExecutionBlock{
+	engine.blks[h] = &enginev1.ExecutionBlock{
 		ParentHash:      p[:],
 		TotalDifficulty: "0XFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF",
 	}
--- a/beacon-chain/blockchain/process_attestation_helpers.go
+++ b/beacon-chain/blockchain/process_attestation_helpers.go
@@ -6,12 +6,12 @@ import (
 	"strconv"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/async"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/transition"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/time/slots"
@@ -76,10 +76,15 @@ func verifyAttTargetEpoch(_ context.Context, genesisTime, nowTime uint64, c *eth
 // verifyBeaconBlock verifies beacon head block is known and not from the future.
 func (s *Service) verifyBeaconBlock(ctx context.Context, data *ethpb.AttestationData) error {
 	r := bytesutil.ToBytes32(data.BeaconBlockRoot)
-	b, err := s.getBlock(ctx, r)
+	b, err := s.cfg.BeaconDB.Block(ctx, r)
 	if err != nil {
 		return err
 	}
+	// If the block does not exist in db, check again if block exists in initial sync block cache.
+	// This could happen as the node first syncs to head.
+	if (b == nil || b.IsNil()) && s.hasInitSyncBlock(r) {
+		b = s.getInitSyncBlock(r)
+	}
 	if err := helpers.BeaconBlockIsNil(b); err != nil {
 		return err
 	}
--- a/beacon-chain/blockchain/process_attestation_test.go
+++ b/beacon-chain/blockchain/process_attestation_test.go
@@ -5,6 +5,7 @@ import (
 	"testing"
 	"time"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/transition"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/doubly-linked-tree"
@@ -12,10 +13,9 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
@@ -438,7 +438,7 @@ func TestVerifyBeaconBlock_NoBlock(t *testing.T) {
 	require.NoError(t, err)

 	d := util.HydrateAttestationData(&ethpb.AttestationData{})
-	require.Equal(t, errBlockNotFoundInCacheOrDB, service.verifyBeaconBlock(ctx, d))
+	assert.ErrorContains(t, "signed beacon block can't be nil", service.verifyBeaconBlock(ctx, d))
 }

 func TestVerifyBeaconBlock_futureBlock(t *testing.T) {
--- a/beacon-chain/blockchain/process_block.go
+++ b/beacon-chain/blockchain/process_block.go
@@ -16,14 +16,13 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/features"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/crypto/bls"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/monitoring/tracing"
 	ethpbv1 "github.com/prysmaticlabs/prysm/proto/eth/v1"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/attestation"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/runtime/version"
 	"github.com/prysmaticlabs/prysm/time/slots"
 	"go.opencensus.io/trace"
@@ -89,7 +88,7 @@ var initialSyncBlockCacheSize = uint64(2 * params.BeaconConfig().SlotsPerEpoch)
 //            ancestor_at_finalized_slot = get_ancestor(store, store.justified_checkpoint.root, finalized_slot)
 //            if ancestor_at_finalized_slot != store.finalized_checkpoint.root:
 //                store.justified_checkpoint = state.current_justified_checkpoint
-func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlock, blockRoot [32]byte) error {
+func (s *Service) onBlock(ctx context.Context, signed block.SignedBeaconBlock, blockRoot [32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.onBlock")
 	defer span.End()
 	if err := helpers.BeaconBlockIsNil(signed); err != nil {
@@ -110,29 +109,16 @@ func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlo
 	if err != nil {
 		return err
 	}
+	if err := s.savePostStateInfo(ctx, blockRoot, signed, postState, false /* reg sync */); err != nil {
+		return err
+	}
 	postStateVersion, postStateHeader, err := getStateVersionAndPayload(postState)
 	if err != nil {
 		return err
 	}
-	isValidPayload, err := s.notifyNewPayload(ctx, postStateVersion, postStateHeader, signed)
-	if err != nil {
+	if err := s.notifyNewPayload(ctx, preStateVersion, postStateVersion, preStateHeader, postStateHeader, signed, blockRoot); err != nil {
 		return errors.Wrap(err, "could not verify new payload")
 	}
-	if isValidPayload {
-		if err := s.validateMergeTransitionBlock(ctx, preStateVersion, preStateHeader, signed); err != nil {
-			return err
-		}
-	}
-
-	if err := s.insertBlockAndAttestationsToForkChoiceStore(ctx, signed.Block(), blockRoot, postState); err != nil {
-		return errors.Wrapf(err, "could not insert block %d to fork choice store", signed.Block().Slot())
-	}
-	s.insertSlashingsToForkChoiceStore(ctx, signed.Block())
-	if isValidPayload {
-		if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, blockRoot); err != nil {
-			return errors.Wrap(err, "could not set optimistic block to valid")
-		}
-	}

 	// We add a proposer score boost to fork choice for the block root if applicable, right after
 	// running a successful state transition for the block.
@@ -146,9 +132,6 @@ func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlo
 		return err
 	}

-	if err := s.savePostStateInfo(ctx, blockRoot, signed, postState); err != nil {
-		return err
-	}
 	// If slasher is configured, forward the attestations in the block via
 	// an event feed for processing.
 	if features.Get().EnableSlasher {
@@ -205,11 +188,12 @@ func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlo
 		msg := fmt.Sprintf("could not read balances for state w/ justified checkpoint %#x", justified.Root)
 		return errors.Wrap(err, msg)
 	}
-	headRoot, err := s.updateHead(ctx, balances)
-	if err != nil {
+	if err := s.updateHead(ctx, balances); err != nil {
 		log.WithError(err).Warn("Could not update head")
 	}
-	s.notifyEngineIfChangedHead(ctx, headRoot)
+	if _, err := s.notifyForkchoiceUpdate(ctx, s.headBlock().Block(), s.headRoot(), bytesutil.ToBytes32(finalized.Root)); err != nil {
+		return err
+	}

 	if err := s.pruneCanonicalAttsFromPool(ctx, blockRoot, signed); err != nil {
 		return err
@@ -254,7 +238,7 @@ func (s *Service) onBlock(ctx context.Context, signed interfaces.SignedBeaconBlo
 		if err := s.cfg.ForkChoiceStore.Prune(ctx, fRoot); err != nil {
 			return errors.Wrap(err, "could not prune proto array fork choice nodes")
 		}
-		isOptimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(fRoot)
+		isOptimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(ctx, fRoot)
 		if err != nil {
 			return errors.Wrap(err, "could not check if node is optimistically synced")
 		}
@@ -305,7 +289,7 @@ func getStateVersionAndPayload(st state.BeaconState) (int, *ethpb.ExecutionPaylo
 	return preStateVersion, preStateHeader, nil
 }

-func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeaconBlock,
+func (s *Service) onBlockBatch(ctx context.Context, blks []block.SignedBeaconBlock,
 	blockRoots [][32]byte) ([]*ethpb.Checkpoint, []*ethpb.Checkpoint, error) {
 	ctx, span := trace.StartSpan(ctx, "blockChain.onBlockBatch")
 	defer span.End()
@@ -391,28 +375,21 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeac

 	// blocks have been verified, add them to forkchoice and call the engine
 	for i, b := range blks {
-		isValidPayload, err := s.notifyNewPayload(ctx,
-			postVersionAndHeaders[i].version,
-			postVersionAndHeaders[i].header, b)
-		if err != nil {
-			return nil, nil, err
-		}
-		if isValidPayload {
-			if err := s.validateMergeTransitionBlock(ctx, preVersionAndHeaders[i].version,
-				preVersionAndHeaders[i].header, b); err != nil {
-				return nil, nil, err
-			}
-		}
-
+		s.saveInitSyncBlock(blockRoots[i], b)
 		if err := s.insertBlockToForkChoiceStore(ctx, b.Block(), blockRoots[i], fCheckpoints[i], jCheckpoints[i]); err != nil {
 			return nil, nil, err
 		}
-		if isValidPayload {
-			if err := s.cfg.ForkChoiceStore.SetOptimisticToValid(ctx, blockRoots[i]); err != nil {
-				return nil, nil, errors.Wrap(err, "could not set optimistic block to valid")
-			}
+		if err := s.notifyNewPayload(ctx,
+			preVersionAndHeaders[i].version,
+			postVersionAndHeaders[i].version,
+			preVersionAndHeaders[i].header,
+			postVersionAndHeaders[i].header, b, blockRoots[i]); err != nil {
+			return nil, nil, err
+		}
+
+		if _, err := s.notifyForkchoiceUpdate(ctx, b.Block(), blockRoots[i], bytesutil.ToBytes32(fCheckpoints[i].Root)); err != nil {
+			return nil, nil, err
 		}
-		s.saveInitSyncBlock(blockRoots[i], b)
 	}

 	for r, st := range boundaries {
@@ -426,18 +403,6 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeac
 	if err := s.cfg.StateGen.SaveState(ctx, lastBR, preState); err != nil {
 		return nil, nil, err
 	}
-	f := fCheckpoints[len(fCheckpoints)-1]
-	j := jCheckpoints[len(jCheckpoints)-1]
-	arg := &notifyForkchoiceUpdateArg{
-		headState:     preState,
-		headRoot:      lastBR,
-		headBlock:     lastB.Block(),
-		finalizedRoot: bytesutil.ToBytes32(f.Root),
-		justifiedRoot: bytesutil.ToBytes32(j.Root),
-	}
-	if _, err := s.notifyForkchoiceUpdate(ctx, arg); err != nil {
-		return nil, nil, err
-	}
 	if err := s.saveHeadNoDB(ctx, lastB, lastBR, preState); err != nil {
 		return nil, nil, err
 	}
@@ -446,7 +411,7 @@ func (s *Service) onBlockBatch(ctx context.Context, blks []interfaces.SignedBeac

 // handles a block after the block's batch has been verified, where we can save blocks
 // their state summaries and split them off to relative hot/cold storage.
-func (s *Service) handleBlockAfterBatchVerify(ctx context.Context, signed interfaces.SignedBeaconBlock,
+func (s *Service) handleBlockAfterBatchVerify(ctx context.Context, signed block.SignedBeaconBlock,
 	blockRoot [32]byte, fCheckpoint, jCheckpoint *ethpb.Checkpoint) error {

 	if err := s.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{
@@ -532,7 +497,7 @@ func (s *Service) handleEpochBoundary(ctx context.Context, postState state.Beaco

 // This feeds in the block and block's attestations to fork choice store. It's allows fork choice store
 // to gain information on the most current chain.
-func (s *Service) insertBlockAndAttestationsToForkChoiceStore(ctx context.Context, blk interfaces.BeaconBlock, root [32]byte,
+func (s *Service) insertBlockAndAttestationsToForkChoiceStore(ctx context.Context, blk block.BeaconBlock, root [32]byte,
 	st state.BeaconState) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.insertBlockAndAttestationsToForkChoiceStore")
 	defer span.End()
@@ -557,7 +522,7 @@ func (s *Service) insertBlockAndAttestationsToForkChoiceStore(ctx context.Contex
 	return nil
 }

-func (s *Service) insertBlockToForkChoiceStore(ctx context.Context, blk interfaces.BeaconBlock,
+func (s *Service) insertBlockToForkChoiceStore(ctx context.Context, blk block.BeaconBlock,
 	root [32]byte, fCheckpoint, jCheckpoint *ethpb.Checkpoint) error {
 	if err := s.fillInForkChoiceMissingBlocks(ctx, blk, fCheckpoint, jCheckpoint); err != nil {
 		return err
@@ -574,19 +539,7 @@ func (s *Service) insertBlockToForkChoiceStore(ctx context.Context, blk interfac
 		fCheckpoint.Epoch)
 }

-// Inserts attester slashing indices to fork choice store.
-// To call this function, it's caller's responsibility to ensure the slashing object is valid.
-func (s *Service) insertSlashingsToForkChoiceStore(ctx context.Context, blk interfaces.BeaconBlock) {
-	slashings := blk.Body().AttesterSlashings()
-	for _, slashing := range slashings {
-		indices := blocks.SlashableAttesterIndices(slashing)
-		for _, index := range indices {
-			s.ForkChoicer().InsertSlashedIndex(ctx, types.ValidatorIndex(index))
-		}
-	}
-}
-
-func getBlockPayloadHash(blk interfaces.BeaconBlock) ([32]byte, error) {
+func getBlockPayloadHash(blk block.BeaconBlock) ([32]byte, error) {
 	payloadHash := [32]byte{}
 	if blocks.IsPreBellatrixVersion(blk.Version()) {
 		return payloadHash, nil
@@ -600,21 +553,26 @@ func getBlockPayloadHash(blk interfaces.BeaconBlock) ([32]byte, error) {

 // This saves post state info to DB or cache. This also saves post state info to fork choice store.
 // Post state info consists of processed block and state. Do not call this method unless the block and state are verified.
-func (s *Service) savePostStateInfo(ctx context.Context, r [32]byte, b interfaces.SignedBeaconBlock, st state.BeaconState) error {
+func (s *Service) savePostStateInfo(ctx context.Context, r [32]byte, b block.SignedBeaconBlock, st state.BeaconState, initSync bool) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.savePostStateInfo")
 	defer span.End()
-	if err := s.cfg.BeaconDB.SaveBlock(ctx, b); err != nil {
+	if initSync {
+		s.saveInitSyncBlock(r, b)
+	} else if err := s.cfg.BeaconDB.SaveBlock(ctx, b); err != nil {
 		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 {
 		return errors.Wrap(err, "could not save state")
 	}
+	if err := s.insertBlockAndAttestationsToForkChoiceStore(ctx, b.Block(), r, st); err != nil {
+		return errors.Wrapf(err, "could not insert block %d to fork choice store", b.Block().Slot())
+	}
 	return nil
 }

 // This removes the attestations from the mem pool. It will only remove the attestations if input root `r` is canonical,
 // meaning the block `b` is part of the canonical chain.
-func (s *Service) pruneCanonicalAttsFromPool(ctx context.Context, r [32]byte, b interfaces.SignedBeaconBlock) error {
+func (s *Service) pruneCanonicalAttsFromPool(ctx context.Context, r [32]byte, b block.SignedBeaconBlock) error {
 	if !features.Get().CorrectlyPruneCanonicalAtts {
 		return nil
 	}
@@ -641,36 +599,3 @@ func (s *Service) pruneCanonicalAttsFromPool(ctx context.Context, r [32]byte, b
 	}
 	return nil
 }
-
-// validateMergeTransitionBlock validates the merge transition block.
-func (s *Service) validateMergeTransitionBlock(ctx context.Context, stateVersion int, stateHeader *ethpb.ExecutionPayloadHeader, blk interfaces.SignedBeaconBlock) error {
-	// Skip validation if block is older than Bellatrix.
-	if blocks.IsPreBellatrixVersion(blk.Block().Version()) {
-		return nil
-	}
-
-	// Skip validation if block has an empty payload.
-	payload, err := blk.Block().Body().ExecutionPayload()
-	if err != nil {
-		return err
-	}
-	if blocks.IsEmptyPayload(payload) {
-		return nil
-	}
-
-	// Handle case where pre-state is Altair but block contains payload.
-	// To reach here, the block must have contained a valid payload.
-	if blocks.IsPreBellatrixVersion(stateVersion) {
-		return s.validateMergeBlock(ctx, blk)
-	}
-
-	// Skip validation if the block is not a merge transition block.
-	atTransition, err := blocks.IsMergeTransitionBlockUsingPreStatePayloadHeader(stateHeader, blk.Block().Body())
-	if err != nil {
-		return errors.Wrap(err, "could not check if merge block is terminal")
-	}
-	if !atTransition {
-		return nil
-	}
-	return s.validateMergeBlock(ctx, blk)
-}
--- a/beacon-chain/blockchain/process_block_helpers.go
+++ b/beacon-chain/blockchain/process_block_helpers.go
@@ -6,15 +6,14 @@ import (
 	"fmt"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
-	mathutil "github.com/prysmaticlabs/prysm/math"
 	"github.com/prysmaticlabs/prysm/monitoring/tracing"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/time/slots"
 	"go.opencensus.io/trace"
 )
@@ -27,7 +26,7 @@ func (s *Service) CurrentSlot() types.Slot {
 // getBlockPreState returns the pre state of an incoming block. It uses the parent root of the block
 // to retrieve the state in DB. It verifies the pre state's validity and the incoming block
 // is in the correct time window.
-func (s *Service) getBlockPreState(ctx context.Context, b interfaces.BeaconBlock) (state.BeaconState, error) {
+func (s *Service) getBlockPreState(ctx context.Context, b block.BeaconBlock) (state.BeaconState, error) {
 	ctx, span := trace.StartSpan(ctx, "blockChain.getBlockPreState")
 	defer span.End()

@@ -58,7 +57,7 @@ func (s *Service) getBlockPreState(ctx context.Context, b interfaces.BeaconBlock
 }

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

@@ -70,7 +69,7 @@ func (s *Service) verifyBlkPreState(ctx context.Context, b interfaces.BeaconBloc
 		return errors.New("could not reconstruct parent state")
 	}

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

@@ -87,10 +86,10 @@ func (s *Service) verifyBlkPreState(ctx context.Context, b interfaces.BeaconBloc
 	return nil
 }

-// VerifyFinalizedBlkDescendant validates if input block root is a descendant of the
+// VerifyBlkDescendant validates input block root is a descendant of the
 // current finalized block root.
-func (s *Service) VerifyFinalizedBlkDescendant(ctx context.Context, root [32]byte) error {
-	ctx, span := trace.StartSpan(ctx, "blockChain.VerifyFinalizedBlkDescendant")
+func (s *Service) VerifyBlkDescendant(ctx context.Context, root [32]byte) error {
+	ctx, span := trace.StartSpan(ctx, "blockChain.VerifyBlkDescendant")
 	defer span.End()
 	finalized := s.store.FinalizedCheckpt()
 	if finalized == nil {
@@ -125,7 +124,7 @@ func (s *Service) VerifyFinalizedBlkDescendant(ctx context.Context, root [32]byt

 // verifyBlkFinalizedSlot validates input block is not less than or equal
 // to current finalized slot.
-func (s *Service) verifyBlkFinalizedSlot(b interfaces.BeaconBlock) error {
+func (s *Service) verifyBlkFinalizedSlot(b block.BeaconBlock) error {
 	finalized := s.store.FinalizedCheckpt()
 	if finalized == nil {
 		return errNilFinalizedInStore
@@ -248,7 +247,7 @@ func (s *Service) updateFinalized(ctx context.Context, cp *ethpb.Checkpoint) err
 	}

 	fRoot := bytesutil.ToBytes32(cp.Root)
-	optimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(fRoot)
+	optimistic, err := s.cfg.ForkChoiceStore.IsOptimistic(ctx, fRoot)
 	if err != nil {
 		return err
 	}
@@ -317,9 +316,17 @@ func (s *Service) ancestorByDB(ctx context.Context, r [32]byte, slot types.Slot)
 		return nil, ctx.Err()
 	}

-	signed, err := s.getBlock(ctx, r)
+	signed, err := s.cfg.BeaconDB.Block(ctx, r)
 	if err != nil {
-		return nil, err
+		return nil, errors.Wrap(err, "could not get ancestor block")
+	}
+
+	if s.hasInitSyncBlock(r) {
+		signed = s.getInitSyncBlock(r)
+	}
+
+	if signed == nil || signed.IsNil() || signed.Block().IsNil() {
+		return nil, errors.New("nil block")
 	}
 	b := signed.Block()
 	if b.Slot() == slot || b.Slot() < slot {
@@ -331,9 +338,9 @@ func (s *Service) ancestorByDB(ctx context.Context, r [32]byte, slot types.Slot)

 // 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, blk interfaces.BeaconBlock,
+func (s *Service) fillInForkChoiceMissingBlocks(ctx context.Context, blk block.BeaconBlock,
 	fCheckpoint, jCheckpoint *ethpb.Checkpoint) error {
-	pendingNodes := make([]interfaces.BeaconBlock, 0)
+	pendingNodes := make([]block.BeaconBlock, 0)
 	pendingRoots := make([][32]byte, 0)

 	parentRoot := bytesutil.ToBytes32(blk.ParentRoot())
@@ -395,17 +402,10 @@ func (s *Service) insertFinalizedDeposits(ctx context.Context, fRoot [32]byte) e
 	// We update the cache up to the last deposit index in the finalized block's state.
 	// We can be confident that these deposits will be included in some block
 	// because the Eth1 follow distance makes such long-range reorgs extremely unlikely.
-	eth1DepositIndex, err := mathutil.Int(finalizedState.Eth1DepositIndex())
-	if err != nil {
-		return errors.Wrap(err, "could not cast eth1 deposit index")
-	}
-	// The deposit index in the state is always the index of the next deposit
-	// to be included(rather than the last one to be processed). This was most likely
-	// done as the state cannot represent signed integers.
-	eth1DepositIndex -= 1
-	s.cfg.DepositCache.InsertFinalizedDeposits(ctx, int64(eth1DepositIndex))
+	eth1DepositIndex := int64(finalizedState.Eth1Data().DepositCount - 1)
+	s.cfg.DepositCache.InsertFinalizedDeposits(ctx, eth1DepositIndex)
 	// Deposit proofs are only used during state transition and can be safely removed to save space.
-	if err = s.cfg.DepositCache.PruneProofs(ctx, int64(eth1DepositIndex)); err != nil {
+	if err = s.cfg.DepositCache.PruneProofs(ctx, eth1DepositIndex); err != nil {
 		return errors.Wrap(err, "could not prune deposit proofs")
 	}
 	return nil
--- a/beacon-chain/blockchain/process_block_test.go
+++ b/beacon-chain/blockchain/process_block_test.go
@@ -9,31 +9,26 @@ import (
 	"time"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	mock "github.com/prysmaticlabs/prysm/beacon-chain/blockchain/testing"
-	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
 	"github.com/prysmaticlabs/prysm/beacon-chain/cache/depositcache"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
-	"github.com/prysmaticlabs/prysm/beacon-chain/core/signing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/transition"
 	"github.com/prysmaticlabs/prysm/beacon-chain/db"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	doublylinkedtree "github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/doubly-linked-tree"
 	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
 	forkchoicetypes "github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/types"
-	mockPOW "github.com/prysmaticlabs/prysm/beacon-chain/powchain/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	v1 "github.com/prysmaticlabs/prysm/beacon-chain/state/v1"
 	"github.com/prysmaticlabs/prysm/config/features"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
-	"github.com/prysmaticlabs/prysm/crypto/bls"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
-	enginev1 "github.com/prysmaticlabs/prysm/proto/engine/v1"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/runtime/version"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
@@ -300,7 +295,7 @@ func TestStore_OnBlockBatch_ProtoArray(t *testing.T) {

 	bState := st.Copy()

-	var blks []interfaces.SignedBeaconBlock
+	var blks []block.SignedBeaconBlock
 	var blkRoots [][32]byte
 	var firstState state.BeaconState
 	for i := 1; i < 10; i++ {
@@ -364,7 +359,7 @@ func TestStore_OnBlockBatch_DoublyLinkedTree(t *testing.T) {

 	bState := st.Copy()

-	var blks []interfaces.SignedBeaconBlock
+	var blks []block.SignedBeaconBlock
 	var blkRoots [][32]byte
 	var firstState state.BeaconState
 	for i := 1; i < 10; i++ {
@@ -421,7 +416,7 @@ func TestStore_OnBlockBatch_NotifyNewPayload(t *testing.T) {
 	st, keys := util.DeterministicGenesisState(t, 64)
 	bState := st.Copy()

-	var blks []interfaces.SignedBeaconBlock
+	var blks []block.SignedBeaconBlock
 	var blkRoots [][32]byte
 	var firstState state.BeaconState
 	blkCount := 4
@@ -588,9 +583,7 @@ func TestCachedPreState_CanGetFromStateSummary_ProtoArray(t *testing.T) {
 	b.Block.ParentRoot = gRoot[:]
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Slot: 1, Root: gRoot[:]}))
 	require.NoError(t, service.cfg.StateGen.SaveState(ctx, gRoot, s))
-	wb, err := wrapper.WrappedBeaconBlock(b.Block)
-	require.NoError(t, err)
-	require.NoError(t, service.verifyBlkPreState(ctx, wb))
+	require.NoError(t, service.verifyBlkPreState(ctx, wrapper.WrappedPhase0BeaconBlock(b.Block)))
 }

 func TestCachedPreState_CanGetFromStateSummary_DoublyLinkedTree(t *testing.T) {
@@ -625,9 +618,7 @@ func TestCachedPreState_CanGetFromStateSummary_DoublyLinkedTree(t *testing.T) {
 	b.Block.ParentRoot = gRoot[:]
 	require.NoError(t, service.cfg.BeaconDB.SaveStateSummary(ctx, &ethpb.StateSummary{Slot: 1, Root: gRoot[:]}))
 	require.NoError(t, service.cfg.StateGen.SaveState(ctx, gRoot, s))
-	wb, err := wrapper.WrappedBeaconBlock(b.Block)
-	require.NoError(t, err)
-	require.NoError(t, service.verifyBlkPreState(ctx, wb))
+	require.NoError(t, service.verifyBlkPreState(ctx, wrapper.WrappedPhase0BeaconBlock(b.Block)))
 }

 func TestCachedPreState_CanGetFromDB(t *testing.T) {
@@ -657,9 +648,7 @@ func TestCachedPreState_CanGetFromDB(t *testing.T) {
 	b := util.NewBeaconBlock()
 	b.Block.Slot = 1
 	service.store.SetFinalizedCheckpt(&ethpb.Checkpoint{Root: gRoot[:]})
-	wb, err := wrapper.WrappedBeaconBlock(b.Block)
-	require.NoError(t, err)
-	err = service.verifyBlkPreState(ctx, wb)
+	err = service.verifyBlkPreState(ctx, wrapper.WrappedPhase0BeaconBlock(b.Block))
 	wanted := "could not reconstruct parent state"
 	assert.ErrorContains(t, wanted, err)

@@ -1351,7 +1340,7 @@ func TestVerifyBlkDescendant(t *testing.T) {
 		service, err := NewService(ctx, opts...)
 		require.NoError(t, err)
 		service.store.SetFinalizedCheckpt(&ethpb.Checkpoint{Root: tt.args.finalizedRoot[:]})
-		err = service.VerifyFinalizedBlkDescendant(ctx, tt.args.parentRoot)
+		err = service.VerifyBlkDescendant(ctx, tt.args.parentRoot)
 		if tt.wantedErr != "" {
 			assert.ErrorContains(t, tt.wantedErr, err)
 		} else if err != nil {
@@ -1527,7 +1516,6 @@ func TestInsertFinalizedDeposits(t *testing.T) {
 	service.store.SetFinalizedCheckpt(&ethpb.Checkpoint{Root: gRoot[:]})
 	gs = gs.Copy()
 	assert.NoError(t, gs.SetEth1Data(&ethpb.Eth1Data{DepositCount: 10}))
-	assert.NoError(t, gs.SetEth1DepositIndex(8))
 	assert.NoError(t, service.cfg.StateGen.SaveState(ctx, [32]byte{'m', 'o', 'c', 'k'}, gs))
 	zeroSig := [96]byte{}
 	for i := uint64(0); i < uint64(4*params.BeaconConfig().SlotsPerEpoch); i++ {
@@ -1541,64 +1529,8 @@ func TestInsertFinalizedDeposits(t *testing.T) {
 	}
 	assert.NoError(t, service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k'}))
 	fDeposits := depositCache.FinalizedDeposits(ctx)
-	assert.Equal(t, 7, int(fDeposits.MerkleTrieIndex), "Finalized deposits not inserted correctly")
-	deps := depositCache.AllDeposits(ctx, big.NewInt(107))
-	for _, d := range deps {
-		assert.DeepEqual(t, [][]byte(nil), d.Proof, "Proofs are not empty")
-	}
-}
-
-func TestInsertFinalizedDeposits_MultipleFinalizedRoutines(t *testing.T) {
-	ctx := context.Background()
-	opts := testServiceOptsWithDB(t)
-	depositCache, err := depositcache.New()
-	require.NoError(t, err)
-	opts = append(opts, WithDepositCache(depositCache))
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-
-	gs, _ := util.DeterministicGenesisState(t, 32)
-	require.NoError(t, service.saveGenesisData(ctx, gs))
-	gBlk, err := service.cfg.BeaconDB.GenesisBlock(ctx)
-	require.NoError(t, err)
-	gRoot, err := gBlk.Block().HashTreeRoot()
-	require.NoError(t, err)
-	service.store.SetFinalizedCheckpt(&ethpb.Checkpoint{Root: gRoot[:]})
-	gs = gs.Copy()
-	assert.NoError(t, gs.SetEth1Data(&ethpb.Eth1Data{DepositCount: 7}))
-	assert.NoError(t, gs.SetEth1DepositIndex(6))
-	assert.NoError(t, service.cfg.StateGen.SaveState(ctx, [32]byte{'m', 'o', 'c', 'k'}, gs))
-	gs2 := gs.Copy()
-	assert.NoError(t, gs2.SetEth1Data(&ethpb.Eth1Data{DepositCount: 15}))
-	assert.NoError(t, gs2.SetEth1DepositIndex(13))
-	assert.NoError(t, service.cfg.StateGen.SaveState(ctx, [32]byte{'m', 'o', 'c', 'k', '2'}, gs2))
-	zeroSig := [96]byte{}
-	for i := uint64(0); i < uint64(4*params.BeaconConfig().SlotsPerEpoch); i++ {
-		root := []byte(strconv.Itoa(int(i)))
-		assert.NoError(t, depositCache.InsertDeposit(ctx, &ethpb.Deposit{Data: &ethpb.Deposit_Data{
-			PublicKey:             bytesutil.FromBytes48([fieldparams.BLSPubkeyLength]byte{}),
-			WithdrawalCredentials: params.BeaconConfig().ZeroHash[:],
-			Amount:                0,
-			Signature:             zeroSig[:],
-		}, Proof: [][]byte{root}}, 100+i, int64(i), bytesutil.ToBytes32(root)))
-	}
-	// Insert 3 deposits before hand.
-	depositCache.InsertFinalizedDeposits(ctx, 2)
-
-	assert.NoError(t, service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k'}))
-	fDeposits := depositCache.FinalizedDeposits(ctx)
-	assert.Equal(t, 5, int(fDeposits.MerkleTrieIndex), "Finalized deposits not inserted correctly")
-
-	deps := depositCache.AllDeposits(ctx, big.NewInt(105))
-	for _, d := range deps {
-		assert.DeepEqual(t, [][]byte(nil), d.Proof, "Proofs are not empty")
-	}
-
-	// Insert New Finalized State with higher deposit count.
-	assert.NoError(t, service.insertFinalizedDeposits(ctx, [32]byte{'m', 'o', 'c', 'k', '2'}))
-	fDeposits = depositCache.FinalizedDeposits(ctx)
-	assert.Equal(t, 12, int(fDeposits.MerkleTrieIndex), "Finalized deposits not inserted correctly")
-	deps = depositCache.AllDeposits(ctx, big.NewInt(112))
+	assert.Equal(t, 9, int(fDeposits.MerkleTrieIndex), "Finalized deposits not inserted correctly")
+	deps := depositCache.AllDeposits(ctx, big.NewInt(109))
 	for _, d := range deps {
 		assert.DeepEqual(t, [][]byte(nil), d.Proof, "Proofs are not empty")
 	}
@@ -1696,194 +1628,10 @@ func Test_getStateVersionAndPayload(t *testing.T) {
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			ver, header, err := getStateVersionAndPayload(tt.st)
+			version, header, err := getStateVersionAndPayload(tt.st)
 			require.NoError(t, err)
-			require.Equal(t, tt.version, ver)
+			require.Equal(t, tt.version, version)
 			require.DeepEqual(t, tt.header, header)
 		})
 	}
 }
-
-func Test_validateMergeTransitionBlock(t *testing.T) {
-	cfg := params.BeaconConfig()
-	cfg.TerminalTotalDifficulty = "2"
-	cfg.TerminalBlockHash = params.BeaconConfig().ZeroHash
-	params.OverrideBeaconConfig(cfg)
-
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-	fcs := protoarray.New(0, 0, [32]byte{'a'})
-	opts := []Option{
-		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB)),
-		WithForkChoiceStore(fcs),
-		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
-	}
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-
-	tests := []struct {
-		name         string
-		stateVersion int
-		header       *ethpb.ExecutionPayloadHeader
-		payload      *enginev1.ExecutionPayload
-		errString    string
-	}{
-		{
-			name:         "state older than Bellatrix, nil payload",
-			stateVersion: 1,
-			payload:      nil,
-		},
-		{
-			name:         "state older than Bellatrix, empty payload",
-			stateVersion: 1,
-			payload: &enginev1.ExecutionPayload{
-				ParentHash:    make([]byte, fieldparams.RootLength),
-				FeeRecipient:  make([]byte, fieldparams.FeeRecipientLength),
-				StateRoot:     make([]byte, fieldparams.RootLength),
-				ReceiptsRoot:  make([]byte, fieldparams.RootLength),
-				LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
-				PrevRandao:    make([]byte, fieldparams.RootLength),
-				BaseFeePerGas: make([]byte, fieldparams.RootLength),
-				BlockHash:     make([]byte, fieldparams.RootLength),
-			},
-		},
-		{
-			name:         "state older than Bellatrix, non empty payload",
-			stateVersion: 1,
-			payload: &enginev1.ExecutionPayload{
-				ParentHash: bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength),
-			},
-		},
-		{
-			name:         "state is Bellatrix, nil payload",
-			stateVersion: 2,
-			payload:      nil,
-		},
-		{
-			name:         "state is Bellatrix, empty payload",
-			stateVersion: 2,
-			payload: &enginev1.ExecutionPayload{
-				ParentHash:    make([]byte, fieldparams.RootLength),
-				FeeRecipient:  make([]byte, fieldparams.FeeRecipientLength),
-				StateRoot:     make([]byte, fieldparams.RootLength),
-				ReceiptsRoot:  make([]byte, fieldparams.RootLength),
-				LogsBloom:     make([]byte, fieldparams.LogsBloomLength),
-				PrevRandao:    make([]byte, fieldparams.RootLength),
-				BaseFeePerGas: make([]byte, fieldparams.RootLength),
-				BlockHash:     make([]byte, fieldparams.RootLength),
-			},
-		},
-		{
-			name:         "state is Bellatrix, non empty payload, empty header",
-			stateVersion: 2,
-			payload: &enginev1.ExecutionPayload{
-				ParentHash: bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength),
-			},
-			header: &ethpb.ExecutionPayloadHeader{
-				ParentHash:       make([]byte, fieldparams.RootLength),
-				FeeRecipient:     make([]byte, fieldparams.FeeRecipientLength),
-				StateRoot:        make([]byte, fieldparams.RootLength),
-				ReceiptsRoot:     make([]byte, fieldparams.RootLength),
-				LogsBloom:        make([]byte, fieldparams.LogsBloomLength),
-				PrevRandao:       make([]byte, fieldparams.RootLength),
-				BaseFeePerGas:    make([]byte, fieldparams.RootLength),
-				BlockHash:        make([]byte, fieldparams.RootLength),
-				TransactionsRoot: make([]byte, fieldparams.RootLength),
-			},
-		},
-		{
-			name:         "state is Bellatrix, non empty payload, non empty header",
-			stateVersion: 2,
-			payload: &enginev1.ExecutionPayload{
-				ParentHash: bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength),
-			},
-			header: &ethpb.ExecutionPayloadHeader{
-				BlockNumber: 1,
-			},
-		},
-		{
-			name:         "state is Bellatrix, non empty payload, nil header",
-			stateVersion: 2,
-			payload: &enginev1.ExecutionPayload{
-				ParentHash: bytesutil.PadTo([]byte{'a'}, fieldparams.RootLength),
-			},
-			errString: "nil header or block body",
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			e := &mockPOW.EngineClient{BlockByHashMap: map[[32]byte]*enginev1.ExecutionBlock{}}
-			e.BlockByHashMap[[32]byte{'a'}] = &enginev1.ExecutionBlock{
-				ParentHash:      bytesutil.PadTo([]byte{'b'}, fieldparams.RootLength),
-				TotalDifficulty: "0x2",
-			}
-			e.BlockByHashMap[[32]byte{'b'}] = &enginev1.ExecutionBlock{
-				ParentHash:      bytesutil.PadTo([]byte{'3'}, fieldparams.RootLength),
-				TotalDifficulty: "0x1",
-			}
-			service.cfg.ExecutionEngineCaller = e
-			b := util.HydrateSignedBeaconBlockBellatrix(&ethpb.SignedBeaconBlockBellatrix{})
-			b.Block.Body.ExecutionPayload = tt.payload
-			blk, err := wrapper.WrappedSignedBeaconBlock(b)
-			require.NoError(t, err)
-			err = service.validateMergeTransitionBlock(ctx, tt.stateVersion, tt.header, blk)
-			if tt.errString != "" {
-				require.ErrorContains(t, tt.errString, err)
-			} else {
-				require.NoError(t, err)
-			}
-		})
-	}
-}
-
-func TestService_insertSlashingsToForkChoiceStore(t *testing.T) {
-	ctx := context.Background()
-	beaconDB := testDB.SetupDB(t)
-	fcs := protoarray.New(0, 0, [32]byte{'a'})
-	opts := []Option{
-		WithDatabase(beaconDB),
-		WithStateGen(stategen.New(beaconDB)),
-		WithForkChoiceStore(fcs),
-		WithProposerIdsCache(cache.NewProposerPayloadIDsCache()),
-	}
-	service, err := NewService(ctx, opts...)
-	require.NoError(t, err)
-
-	beaconState, privKeys := util.DeterministicGenesisState(t, 100)
-	att1 := util.HydrateIndexedAttestation(&ethpb.IndexedAttestation{
-		Data: &ethpb.AttestationData{
-			Source: &ethpb.Checkpoint{Epoch: 1},
-		},
-		AttestingIndices: []uint64{0, 1},
-	})
-	domain, err := signing.Domain(beaconState.Fork(), 0, params.BeaconConfig().DomainBeaconAttester, beaconState.GenesisValidatorsRoot())
-	require.NoError(t, err)
-	signingRoot, err := signing.ComputeSigningRoot(att1.Data, domain)
-	assert.NoError(t, err, "Could not get signing root of beacon block header")
-	sig0 := privKeys[0].Sign(signingRoot[:])
-	sig1 := privKeys[1].Sign(signingRoot[:])
-	aggregateSig := bls.AggregateSignatures([]bls.Signature{sig0, sig1})
-	att1.Signature = aggregateSig.Marshal()
-
-	att2 := util.HydrateIndexedAttestation(&ethpb.IndexedAttestation{
-		AttestingIndices: []uint64{0, 1},
-	})
-	signingRoot, err = signing.ComputeSigningRoot(att2.Data, domain)
-	assert.NoError(t, err, "Could not get signing root of beacon block header")
-	sig0 = privKeys[0].Sign(signingRoot[:])
-	sig1 = privKeys[1].Sign(signingRoot[:])
-	aggregateSig = bls.AggregateSignatures([]bls.Signature{sig0, sig1})
-	att2.Signature = aggregateSig.Marshal()
-	slashings := []*ethpb.AttesterSlashing{
-		{
-			Attestation_1: att1,
-			Attestation_2: att2,
-		},
-	}
-	b := util.NewBeaconBlock()
-	b.Block.Body.AttesterSlashings = slashings
-	wb, err := wrapper.WrappedSignedBeaconBlock(b)
-	require.NoError(t, err)
-	service.insertSlashingsToForkChoiceStore(ctx, wb.Block())
-}
--- a/beacon-chain/blockchain/receive_attestation.go
+++ b/beacon-chain/blockchain/receive_attestation.go
@@ -28,10 +28,27 @@ type AttestationStateFetcher interface {
 // AttestationReceiver interface defines the methods of chain service receive and processing new attestations.
 type AttestationReceiver interface {
 	AttestationStateFetcher
+	ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error
 	VerifyLmdFfgConsistency(ctx context.Context, att *ethpb.Attestation) error
 	VerifyFinalizedConsistency(ctx context.Context, root []byte) error
 }

+// ReceiveAttestationNoPubsub is a function that defines the operations that are performed on
+// attestation that is received from regular sync. The operations consist of:
+//  1. Validate attestation, update validator's latest vote
+//  2. Apply fork choice to the processed attestation
+//  3. Save latest head info
+func (s *Service) ReceiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error {
+	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.ReceiveAttestationNoPubsub")
+	defer span.End()
+
+	if err := s.OnAttestation(ctx, att); err != nil {
+		return errors.Wrap(err, "could not process attestation")
+	}
+
+	return nil
+}
+
 // AttestationTargetState returns the pre state of attestation.
 func (s *Service) AttestationTargetState(ctx context.Context, target *ethpb.Checkpoint) (state.BeaconState, error) {
 	ss, err := slots.EpochStart(target.Epoch)
@@ -66,8 +83,7 @@ func (s *Service) VerifyLmdFfgConsistency(ctx context.Context, a *ethpb.Attestat
 func (s *Service) VerifyFinalizedConsistency(ctx context.Context, root []byte) error {
 	// A canonical root implies the root to has an ancestor that aligns with finalized check point.
 	// In this case, we could exit early to save on additional computation.
-	blockRoot := bytesutil.ToBytes32(root)
-	if s.cfg.ForkChoiceStore.HasNode(blockRoot) && s.cfg.ForkChoiceStore.IsCanonical(blockRoot) {
+	if s.cfg.ForkChoiceStore.IsCanonical(bytesutil.ToBytes32(root)) {
 		return nil
 	}

@@ -117,7 +133,7 @@ func (s *Service) spawnProcessAttestationsRoutine(stateFeed *event.Feed) {
 			log.Warn("Genesis time received, now available to process attestations")
 		}

-		st := slots.NewSlotTicker(s.genesisTime, params.BeaconConfig().SecondsPerSlot/2)
+		st := slots.NewSlotTicker(s.genesisTime, params.BeaconConfig().SecondsPerSlot)
 		for {
 			select {
 			case <-s.ctx.Done():
@@ -145,63 +161,34 @@ func (s *Service) spawnProcessAttestationsRoutine(stateFeed *event.Feed) {
 					log.WithError(err).Errorf("Unable to get justified balances for root %v", justified.Root)
 					continue
 				}
-				newHeadRoot, err := s.updateHead(s.ctx, balances)
-				if err != nil {
+				prevHead := s.headRoot()
+				if err := s.updateHead(s.ctx, balances); err != nil {
 					log.WithError(err).Warn("Resolving fork due to new attestation")
 				}
-				if s.headRoot() != newHeadRoot {
-					log.WithFields(logrus.Fields{
-						"oldHeadRoot": fmt.Sprintf("%#x", s.headRoot()),
-						"newHeadRoot": fmt.Sprintf("%#x", newHeadRoot),
-					}).Debug("Head changed due to attestations")
-				}
-				s.notifyEngineIfChangedHead(s.ctx, newHeadRoot)
+				s.notifyEngineIfChangedHead(prevHead)
 			}
 		}
 	}()
 }

 // This calls notify Forkchoice Update in the event that the head has changed
-func (s *Service) notifyEngineIfChangedHead(ctx context.Context, newHeadRoot [32]byte) {
-	if s.headRoot() == newHeadRoot {
+func (s *Service) notifyEngineIfChangedHead(prevHead [32]byte) {
+	if s.headRoot() == prevHead {
 		return
 	}
-
-	if !s.hasBlockInInitSyncOrDB(ctx, newHeadRoot) {
-		log.Debug("New head does not exist in DB. Do nothing")
-		return // We don't have the block, don't notify the engine and update head.
-	}
-
 	finalized := s.store.FinalizedCheckpt()
 	if finalized == nil {
 		log.WithError(errNilFinalizedInStore).Error("could not get finalized checkpoint")
 		return
 	}
-
-	newHeadBlock, err := s.getBlock(ctx, newHeadRoot)
-	if err != nil {
-		log.WithError(err).Error("Could not get new head block")
-		return
-	}
-	headState, err := s.cfg.StateGen.StateByRoot(ctx, newHeadRoot)
-	if err != nil {
-		log.WithError(err).Error("Could not get state from db")
-		return
-	}
-	arg := &notifyForkchoiceUpdateArg{
-		headState:     headState,
-		headRoot:      newHeadRoot,
-		headBlock:     newHeadBlock.Block(),
-		finalizedRoot: bytesutil.ToBytes32(finalized.Root),
-		justifiedRoot: bytesutil.ToBytes32(s.store.JustifiedCheckpt().Root),
-	}
-	_, err = s.notifyForkchoiceUpdate(s.ctx, arg)
+	_, err := s.notifyForkchoiceUpdate(s.ctx,
+		s.headBlock().Block(),
+		s.headRoot(),
+		bytesutil.ToBytes32(finalized.Root),
+	)
 	if err != nil {
 		log.WithError(err).Error("could not notify forkchoice update")
 	}
-	if err := s.saveHead(ctx, newHeadRoot, newHeadBlock, headState); err != nil {
-		log.WithError(err).Error("could not save head")
-	}
 }

 // This processes fork choice attestations from the pool to account for validator votes and fork choice.
@@ -230,7 +217,7 @@ func (s *Service) processAttestations(ctx context.Context) {
 			continue
 		}

-		if err := s.receiveAttestationNoPubsub(ctx, a); err != nil {
+		if err := s.ReceiveAttestationNoPubsub(ctx, a); err != nil {
 			log.WithFields(logrus.Fields{
 				"slot":             a.Data.Slot,
 				"committeeIndex":   a.Data.CommitteeIndex,
@@ -241,19 +228,3 @@ func (s *Service) processAttestations(ctx context.Context) {
 		}
 	}
 }
-
-// receiveAttestationNoPubsub is a function that defines the operations that are performed on
-// attestation that is received from regular sync. The operations consist of:
-//  1. Validate attestation, update validator's latest vote
-//  2. Apply fork choice to the processed attestation
-//  3. Save latest head info
-func (s *Service) receiveAttestationNoPubsub(ctx context.Context, att *ethpb.Attestation) error {
-	ctx, span := trace.StartSpan(ctx, "beacon-chain.blockchain.receiveAttestationNoPubsub")
-	defer span.End()
-
-	if err := s.OnAttestation(ctx, att); err != nil {
-		return errors.Wrap(err, "could not process attestation")
-	}
-
-	return nil
-}
--- a/beacon-chain/blockchain/receive_attestation_test.go
+++ b/beacon-chain/blockchain/receive_attestation_test.go
@@ -5,16 +5,15 @@ import (
 	"testing"
 	"time"

-	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/transition"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/operations/attestations"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
 	prysmTime "github.com/prysmaticlabs/prysm/time"
@@ -134,69 +133,31 @@ func TestNotifyEngineIfChangedHead(t *testing.T) {

 	service, err := NewService(ctx, opts...)
 	require.NoError(t, err)
-	service.cfg.ProposerSlotIndexCache = cache.NewProposerPayloadIDsCache()
-	service.notifyEngineIfChangedHead(ctx, service.headRoot())
+
+	service.notifyEngineIfChangedHead(service.headRoot())
 	hookErr := "could not notify forkchoice update"
 	finalizedErr := "could not get finalized checkpoint"
 	require.LogsDoNotContain(t, hook, finalizedErr)
 	require.LogsDoNotContain(t, hook, hookErr)
-	gb, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlock())
-	require.NoError(t, err)
-	service.saveInitSyncBlock([32]byte{'a'}, gb)
-	service.notifyEngineIfChangedHead(ctx, [32]byte{'a'})
+	service.notifyEngineIfChangedHead([32]byte{'a'})
 	require.LogsContain(t, hook, finalizedErr)

 	hook.Reset()
-	service.head = &head{
-		root:  [32]byte{'a'},
-		block: nil, /* should not panic if notify head uses correct head */
-	}
-
-	// Block in Cache
 	b := util.NewBeaconBlock()
-	b.Block.Slot = 2
+	b.Block.Slot = 1
 	wsb, err := wrapper.WrappedSignedBeaconBlock(b)
 	require.NoError(t, err)
-	r1, err := b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	service.saveInitSyncBlock(r1, wsb)
-	finalized := &ethpb.Checkpoint{Root: r1[:], Epoch: 0}
-	st, _ := util.DeterministicGenesisState(t, 1)
-	service.head = &head{
-		slot:  1,
-		root:  r1,
-		block: wsb,
-		state: st,
-	}
-	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(2, 1, [8]byte{1})
-	service.store.SetFinalizedCheckpt(finalized)
-	service.notifyEngineIfChangedHead(ctx, r1)
-	require.LogsDoNotContain(t, hook, finalizedErr)
-	require.LogsDoNotContain(t, hook, hookErr)
-
-	// Block in DB
-	b = util.NewBeaconBlock()
-	b.Block.Slot = 3
-	wsb, err = wrapper.WrappedSignedBeaconBlock(b)
-	require.NoError(t, err)
 	require.NoError(t, service.cfg.BeaconDB.SaveBlock(ctx, wsb))
-	r1, err = b.Block.HashTreeRoot()
+	r, err := b.Block.HashTreeRoot()
 	require.NoError(t, err)
-	finalized = &ethpb.Checkpoint{Root: r1[:], Epoch: 0}
-	st, _ = util.DeterministicGenesisState(t, 1)
+	finalized := &ethpb.Checkpoint{Root: r[:], Epoch: 0}
 	service.head = &head{
 		slot:  1,
-		root:  r1,
+		root:  r,
 		block: wsb,
-		state: st,
 	}
-	service.cfg.ProposerSlotIndexCache.SetProposerAndPayloadIDs(2, 1, [8]byte{1})
 	service.store.SetFinalizedCheckpt(finalized)
-	service.notifyEngineIfChangedHead(ctx, r1)
+	service.notifyEngineIfChangedHead([32]byte{'b'})
 	require.LogsDoNotContain(t, hook, finalizedErr)
 	require.LogsDoNotContain(t, hook, hookErr)
-	vId, payloadID, has := service.cfg.ProposerSlotIndexCache.GetProposerPayloadIDs(2)
-	require.Equal(t, true, has)
-	require.Equal(t, types.ValidatorIndex(1), vId)
-	require.Equal(t, [8]byte{1}, payloadID)
 }
--- a/beacon-chain/blockchain/receive_block.go
+++ b/beacon-chain/blockchain/receive_block.go
@@ -4,11 +4,11 @@ import (
 	"context"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
 	statefeed "github.com/prysmaticlabs/prysm/beacon-chain/core/feed/state"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/monitoring/tracing"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/prysmaticlabs/prysm/time"
 	"github.com/prysmaticlabs/prysm/time/slots"
 	"go.opencensus.io/trace"
@@ -17,11 +17,11 @@ import (
 // This defines how many epochs since finality the run time will begin to save hot state on to the DB.
 var epochsSinceFinalitySaveHotStateDB = types.Epoch(100)

-// BlockReceiver interface defines the methods of chain service for receiving and processing new blocks.
+// BlockReceiver interface defines the methods of chain service receive and processing new blocks.
 type BlockReceiver interface {
-	ReceiveBlock(ctx context.Context, block interfaces.SignedBeaconBlock, blockRoot [32]byte) error
-	ReceiveBlockBatch(ctx context.Context, blocks []interfaces.SignedBeaconBlock, blkRoots [][32]byte) error
-	HasBlock(ctx context.Context, root [32]byte) bool
+	ReceiveBlock(ctx context.Context, block block.SignedBeaconBlock, blockRoot [32]byte) error
+	ReceiveBlockBatch(ctx context.Context, blocks []block.SignedBeaconBlock, blkRoots [][32]byte) error
+	HasInitSyncBlock(root [32]byte) bool
 }

 // ReceiveBlock is a function that defines the the operations (minus pubsub)
@@ -29,7 +29,7 @@ type BlockReceiver interface {
 //   1. Validate block, apply state transition and update check points
 //   2. Apply fork choice to the processed block
 //   3. Save latest head info
-func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.SignedBeaconBlock, blockRoot [32]byte) error {
+func (s *Service) ReceiveBlock(ctx context.Context, block block.SignedBeaconBlock, blockRoot [32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.ReceiveBlock")
 	defer span.End()
 	receivedTime := time.Now()
@@ -74,11 +74,11 @@ func (s *Service) ReceiveBlock(ctx context.Context, block interfaces.SignedBeaco
 // ReceiveBlockBatch processes the whole block batch at once, assuming the block batch is linear ,transitioning
 // the state, performing batch verification of all collected signatures and then performing the appropriate
 // actions for a block post-transition.
-func (s *Service) ReceiveBlockBatch(ctx context.Context, blocks []interfaces.SignedBeaconBlock, blkRoots [][32]byte) error {
+func (s *Service) ReceiveBlockBatch(ctx context.Context, blocks []block.SignedBeaconBlock, blkRoots [][32]byte) error {
 	ctx, span := trace.StartSpan(ctx, "blockChain.ReceiveBlockBatch")
 	defer span.End()

-	// Apply state transition on the incoming newly received block batches, one by one.
+	// Apply state transition on the incoming newly received blockCopy without verifying its BLS contents.
 	fCheckpoints, jCheckpoints, err := s.onBlockBatch(ctx, blocks, blkRoots)
 	if err != nil {
 		err := errors.Wrap(err, "could not process block in batch")
@@ -88,6 +88,7 @@ func (s *Service) ReceiveBlockBatch(ctx context.Context, blocks []interfaces.Sig

 	for i, b := range blocks {
 		blockCopy := b.Copy()
+		// TODO(10261) check optimistic status
 		if err = s.handleBlockAfterBatchVerify(ctx, blockCopy, blkRoots[i], fCheckpoints[i], jCheckpoints[i]); err != nil {
 			tracing.AnnotateError(span, err)
 			return err
@@ -128,12 +129,12 @@ func (s *Service) ReceiveBlockBatch(ctx context.Context, blocks []interfaces.Sig
 	return nil
 }

-// 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 {
-	return s.hasBlockInInitSyncOrDB(ctx, root)
+// HasInitSyncBlock returns true if the block of the input root exists in initial sync blocks cache.
+func (s *Service) HasInitSyncBlock(root [32]byte) bool {
+	return s.hasInitSyncBlock(root)
 }

-func (s *Service) handlePostBlockOperations(b interfaces.BeaconBlock) error {
+func (s *Service) handlePostBlockOperations(b block.BeaconBlock) error {
 	// Delete the processed block attestations from attestation pool.
 	if err := s.deletePoolAtts(b.Body().Attestations()); err != nil {
 		return err
--- a/beacon-chain/blockchain/receive_block_test.go
+++ b/beacon-chain/blockchain/receive_block_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"
 	"time"

+	types "github.com/prysmaticlabs/eth2-types"
 	blockchainTesting "github.com/prysmaticlabs/prysm/beacon-chain/blockchain/testing"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/forkchoice/protoarray"
@@ -13,11 +14,10 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/operations/voluntaryexits"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
@@ -267,7 +267,7 @@ func TestService_ReceiveBlockBatch(t *testing.T) {
 			require.NoError(t, err)
 			wsb, err := wrapper.WrappedSignedBeaconBlock(tt.args.block)
 			require.NoError(t, err)
-			blks := []interfaces.SignedBeaconBlock{wsb}
+			blks := []block.SignedBeaconBlock{wsb}
 			roots := [][32]byte{root}
 			err = s.ReceiveBlockBatch(ctx, blks, roots)
 			if tt.wantedErr != "" {
@@ -280,29 +280,21 @@ func TestService_ReceiveBlockBatch(t *testing.T) {
 	}
 }

-func TestService_HasBlock(t *testing.T) {
-	opts := testServiceOptsWithDB(t)
+func TestService_HasInitSyncBlock(t *testing.T) {
+	opts := testServiceOptsNoDB()
 	opts = append(opts, WithStateNotifier(&blockchainTesting.MockStateNotifier{}))
 	s, err := NewService(context.Background(), opts...)
 	require.NoError(t, err)
 	r := [32]byte{'a'}
-	if s.HasBlock(context.Background(), r) {
+	if s.HasInitSyncBlock(r) {
 		t.Error("Should not have block")
 	}
 	wsb, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlock())
 	require.NoError(t, err)
 	s.saveInitSyncBlock(r, wsb)
-	if !s.HasBlock(context.Background(), r) {
+	if !s.HasInitSyncBlock(r) {
 		t.Error("Should have block")
 	}
-	b := util.NewBeaconBlock()
-	b.Block.Slot = 1
-	wsb, err = wrapper.WrappedSignedBeaconBlock(b)
-	require.NoError(t, err)
-	r, err = b.Block.HashTreeRoot()
-	require.NoError(t, err)
-	require.NoError(t, s.cfg.BeaconDB.SaveBlock(context.Background(), wsb))
-	require.Equal(t, true, s.HasBlock(context.Background(), r))
 }

 func TestCheckSaveHotStateDB_Enabling(t *testing.T) {
--- a/beacon-chain/blockchain/service.go
+++ b/beacon-chain/blockchain/service.go
@@ -11,6 +11,7 @@ import (
 	"time"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/async/event"
 	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain/store"
 	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
@@ -28,15 +29,15 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/operations/voluntaryexits"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
+	enginev1 "github.com/prysmaticlabs/prysm/beacon-chain/powchain/engine-api-client/v1"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	"github.com/prysmaticlabs/prysm/cmd/beacon-chain/flags"
 	"github.com/prysmaticlabs/prysm/config/features"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	prysmTime "github.com/prysmaticlabs/prysm/time"
 	"github.com/prysmaticlabs/prysm/time/slots"
 	"github.com/sirupsen/logrus"
@@ -50,17 +51,18 @@ const headSyncMinEpochsAfterCheckpoint = 128
 // Service represents a service that handles the internal
 // logic of managing the full PoS beacon chain.
 type Service struct {
-	cfg                   *config
-	ctx                   context.Context
-	cancel                context.CancelFunc
-	genesisTime           time.Time
-	head                  *head
-	headLock              sync.RWMutex
-	originBlockRoot       [32]byte // genesis root, or weak subjectivity checkpoint root, depending on how the node is initialized
+	cfg         *config
+	ctx         context.Context
+	cancel      context.CancelFunc
+	genesisTime time.Time
+	head        *head
+	headLock    sync.RWMutex
+	// originBlockRoot is the genesis root, or weak subjectivity checkpoint root, depending on how the node is initialized
+	originBlockRoot       [32]byte
 	nextEpochBoundarySlot types.Slot
 	boundaryRoots         [][32]byte
 	checkpointStateCache  *cache.CheckpointStateCache
-	initSyncBlocks        map[[32]byte]interfaces.SignedBeaconBlock
+	initSyncBlocks        map[[32]byte]block.SignedBeaconBlock
 	initSyncBlocksLock    sync.RWMutex
 	justifiedBalances     *stateBalanceCache
 	wsVerifier            *WeakSubjectivityVerifier
@@ -73,7 +75,6 @@ type config struct {
 	ChainStartFetcher       powchain.ChainStartFetcher
 	BeaconDB                db.HeadAccessDatabase
 	DepositCache            *depositcache.DepositCache
-	ProposerSlotIndexCache  *cache.ProposerPayloadIDsCache
 	AttPool                 attestations.Pool
 	ExitPool                voluntaryexits.PoolManager
 	SlashingPool            slashings.PoolManager
@@ -87,7 +88,7 @@ type config struct {
 	WeakSubjectivityCheckpt *ethpb.Checkpoint
 	BlockFetcher            powchain.POWBlockFetcher
 	FinalizedStateAtStartUp state.BeaconState
-	ExecutionEngineCaller   powchain.EngineCaller
+	ExecutionEngineCaller   enginev1.Caller
 }

 // NewService instantiates a new block service instance that will
@@ -99,7 +100,7 @@ func NewService(ctx context.Context, opts ...Option) (*Service, error) {
 		cancel:               cancel,
 		boundaryRoots:        [][32]byte{},
 		checkpointStateCache: cache.NewCheckpointStateCache(),
-		initSyncBlocks:       make(map[[32]byte]interfaces.SignedBeaconBlock),
+		initSyncBlocks:       make(map[[32]byte]block.SignedBeaconBlock),
 		cfg:                  &config{},
 		store:                &store.Store{},
 	}
@@ -159,12 +160,11 @@ func (s *Service) Status() error {
 		return errors.New("genesis state has not been created")
 	}
 	if runtime.NumGoroutine() > s.cfg.MaxRoutines {
-		return fmt.Errorf("too many goroutines (%d)", runtime.NumGoroutine())
+		return fmt.Errorf("too many goroutines %d", runtime.NumGoroutine())
 	}
 	return nil
 }

-// StartFromSavedState initializes the blockchain using a previously saved finalized checkpoint.
 func (s *Service) StartFromSavedState(saved state.BeaconState) error {
 	log.Info("Blockchain data already exists in DB, initializing...")
 	s.genesisTime = time.Unix(int64(saved.GenesisTime()), 0) // lint:ignore uintcast -- Genesis time will not exceed int64 in your lifetime.
@@ -191,19 +191,19 @@ func (s *Service) StartFromSavedState(saved state.BeaconState) error {
 	}
 	s.store = store.New(justified, finalized)

-	var forkChoicer f.ForkChoicer
+	var store f.ForkChoicer
 	fRoot := bytesutil.ToBytes32(finalized.Root)
 	if features.Get().EnableForkChoiceDoublyLinkedTree {
-		forkChoicer = doublylinkedtree.New(justified.Epoch, finalized.Epoch)
+		store = doublylinkedtree.New(justified.Epoch, finalized.Epoch)
 	} else {
-		forkChoicer = protoarray.New(justified.Epoch, finalized.Epoch, fRoot)
+		store = protoarray.New(justified.Epoch, finalized.Epoch, fRoot)
 	}
-	s.cfg.ForkChoiceStore = forkChoicer
+	s.cfg.ForkChoiceStore = store
 	fb, err := s.cfg.BeaconDB.Block(s.ctx, s.ensureRootNotZeros(fRoot))
 	if err != nil {
 		return errors.Wrap(err, "could not get finalized checkpoint block")
 	}
-	if fb == nil || fb.IsNil() {
+	if fb == nil {
 		return errNilFinalizedInStore
 	}
 	payloadHash, err := getBlockPayloadHash(fb.Block())
@@ -211,7 +211,7 @@ func (s *Service) StartFromSavedState(saved state.BeaconState) error {
 		return errors.Wrap(err, "could not get execution payload hash")
 	}
 	fSlot := fb.Block().Slot()
-	if err := forkChoicer.InsertOptimisticBlock(s.ctx, fSlot, fRoot, params.BeaconConfig().ZeroHash,
+	if err := store.InsertOptimisticBlock(s.ctx, fSlot, fRoot, params.BeaconConfig().ZeroHash,
 		payloadHash, justified.Epoch, finalized.Epoch); err != nil {
 		return errors.Wrap(err, "could not insert finalized block to forkchoice")
 	}
@@ -221,7 +221,7 @@ func (s *Service) StartFromSavedState(saved state.BeaconState) error {
 		return errors.Wrap(err, "could not get last validated checkpoint")
 	}
 	if bytes.Equal(finalized.Root, lastValidatedCheckpoint.Root) {
-		if err := forkChoicer.SetOptimisticToValid(s.ctx, fRoot); err != nil {
+		if err := store.SetOptimisticToValid(s.ctx, fRoot); err != nil {
 			return errors.Wrap(err, "could not set finalized block as validated")
 		}
 	}
@@ -281,9 +281,9 @@ func (s *Service) originRootFromSavedState(ctx context.Context) ([32]byte, error
 	return genesisBlkRoot, nil
 }

-// initializeHeadFromDB uses the finalized checkpoint and head block found in the database to set the current head.
-// Note that this may block until stategen replays blocks between the finalized and head blocks
-// if the head sync flag was specified and the gap between the finalized and head blocks is at least 128 epochs long.
+// initializeHeadFromDB uses the finalized checkpoint and head block found in the database to set the current head
+// note that this may block until stategen replays blocks between the finalized and head blocks
+// if the head sync flag was specified and the gap between the finalized and head blocks is at least 128 epochs long
 func (s *Service) initializeHeadFromDB(ctx context.Context) error {
 	finalized, err := s.cfg.BeaconDB.FinalizedCheckpoint(ctx)
 	if err != nil {
@@ -362,9 +362,9 @@ func (s *Service) startFromPOWChain() error {
 		defer stateSub.Unsubscribe()
 		for {
 			select {
-			case e := <-stateChannel:
-				if e.Type == statefeed.ChainStarted {
-					data, ok := e.Data.(*statefeed.ChainStartedData)
+			case event := <-stateChannel:
+				if event.Type == statefeed.ChainStarted {
+					data, ok := event.Data.(*statefeed.ChainStartedData)
 					if !ok {
 						log.Error("event data is not type *statefeed.ChainStartedData")
 						return
--- a/beacon-chain/blockchain/service_norace_test.go
+++ b/beacon-chain/blockchain/service_norace_test.go
@@ -2,19 +2,17 @@ package blockchain

 import (
 	"context"
-	"io"
+	"io/ioutil"
 	"testing"

 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/require"
-	"github.com/prysmaticlabs/prysm/testing/util"
 	"github.com/sirupsen/logrus"
 )

 func init() {
 	logrus.SetLevel(logrus.DebugLevel)
-	logrus.SetOutput(io.Discard)
+	logrus.SetOutput(ioutil.Discard)
 }

 func TestChainService_SaveHead_DataRace(t *testing.T) {
@@ -22,11 +20,8 @@ func TestChainService_SaveHead_DataRace(t *testing.T) {
 	s := &Service{
 		cfg: &config{BeaconDB: beaconDB},
 	}
-	b, err := wrapper.WrappedSignedBeaconBlock(util.NewBeaconBlock())
-	st, _ := util.DeterministicGenesisState(t, 1)
-	require.NoError(t, err)
 	go func() {
-		require.NoError(t, s.saveHead(context.Background(), [32]byte{}, b, st))
+		require.NoError(t, s.saveHead(context.Background(), [32]byte{}))
 	}()
-	require.NoError(t, s.saveHead(context.Background(), [32]byte{}, b, st))
+	require.NoError(t, s.saveHead(context.Background(), [32]byte{}))
 }
--- a/beacon-chain/blockchain/service_test.go
+++ b/beacon-chain/blockchain/service_test.go
@@ -24,15 +24,14 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/operations/attestations"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	"github.com/prysmaticlabs/prysm/beacon-chain/powchain"
-	mockPOW "github.com/prysmaticlabs/prysm/beacon-chain/powchain/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state/stategen"
 	v1 "github.com/prysmaticlabs/prysm/beacon-chain/state/v1"
 	"github.com/prysmaticlabs/prysm/cmd/beacon-chain/flags"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
@@ -75,14 +74,10 @@ func (mb *mockBroadcaster) BroadcastSyncCommitteeMessage(_ context.Context, _ ui
 var _ p2p.Broadcaster = (*mockBroadcaster)(nil)

 func setupBeaconChain(t *testing.T, beaconDB db.Database) *Service {
+	endpoint := "http://127.0.0.1"
 	ctx := context.Background()
 	var web3Service *powchain.Service
 	var err error
-	srv, endpoint, err := mockPOW.SetupRPCServer()
-	require.NoError(t, err)
-	t.Cleanup(func() {
-		srv.Stop()
-	})
 	bState, _ := util.DeterministicGenesisState(t, 10)
 	pbState, err := v1.ProtobufBeaconState(bState.InnerStateUnsafe())
 	require.NoError(t, err)
@@ -501,12 +496,12 @@ func TestHasBlock_ForkChoiceAndDB_ProtoArray(t *testing.T) {
 		store: &store.Store{},
 	}
 	s.store.SetFinalizedCheckpt(&ethpb.Checkpoint{Epoch: 0, Root: params.BeaconConfig().ZeroHash[:]})
-	b := util.NewBeaconBlock()
-	r, err := b.Block.HashTreeRoot()
+	block := util.NewBeaconBlock()
+	r, err := block.Block.HashTreeRoot()
 	require.NoError(t, err)
 	beaconState, err := util.NewBeaconState()
 	require.NoError(t, err)
-	wsb, err := wrapper.WrappedSignedBeaconBlock(b)
+	wsb, err := wrapper.WrappedSignedBeaconBlock(block)
 	require.NoError(t, err)
 	require.NoError(t, s.insertBlockAndAttestationsToForkChoiceStore(ctx, wsb.Block(), r, beaconState))

@@ -522,12 +517,12 @@ func TestHasBlock_ForkChoiceAndDB_DoublyLinkedTree(t *testing.T) {
 		store: &store.Store{},
 	}
 	s.store.SetFinalizedCheckpt(&ethpb.Checkpoint{Epoch: 0, Root: params.BeaconConfig().ZeroHash[:]})
-	b := util.NewBeaconBlock()
-	r, err := b.Block.HashTreeRoot()
+	block := util.NewBeaconBlock()
+	r, err := block.Block.HashTreeRoot()
 	require.NoError(t, err)
 	beaconState, err := util.NewBeaconState()
 	require.NoError(t, err)
-	wsb, err := wrapper.WrappedSignedBeaconBlock(b)
+	wsb, err := wrapper.WrappedSignedBeaconBlock(block)
 	require.NoError(t, err)
 	require.NoError(t, s.insertBlockAndAttestationsToForkChoiceStore(ctx, wsb.Block(), r, beaconState))

@@ -542,12 +537,12 @@ func TestServiceStop_SaveCachedBlocks(t *testing.T) {
 		cfg:            &config{BeaconDB: beaconDB, StateGen: stategen.New(beaconDB)},
 		ctx:            ctx,
 		cancel:         cancel,
-		initSyncBlocks: make(map[[32]byte]interfaces.SignedBeaconBlock),
+		initSyncBlocks: make(map[[32]byte]block.SignedBeaconBlock),
 	}
-	b := util.NewBeaconBlock()
-	r, err := b.Block.HashTreeRoot()
+	block := util.NewBeaconBlock()
+	r, err := block.Block.HashTreeRoot()
 	require.NoError(t, err)
-	wsb, err := wrapper.WrappedSignedBeaconBlock(b)
+	wsb, err := wrapper.WrappedSignedBeaconBlock(block)
 	require.NoError(t, err)
 	s.saveInitSyncBlock(r, wsb)
 	require.NoError(t, s.Stop())
@@ -574,11 +569,11 @@ func BenchmarkHasBlockDB(b *testing.B) {
 	s := &Service{
 		cfg: &config{BeaconDB: beaconDB},
 	}
-	blk := util.NewBeaconBlock()
-	wsb, err := wrapper.WrappedSignedBeaconBlock(blk)
+	block := util.NewBeaconBlock()
+	wsb, err := wrapper.WrappedSignedBeaconBlock(block)
 	require.NoError(b, err)
 	require.NoError(b, s.cfg.BeaconDB.SaveBlock(ctx, wsb))
-	r, err := blk.Block.HashTreeRoot()
+	r, err := block.Block.HashTreeRoot()
 	require.NoError(b, err)

 	b.ResetTimer()
@@ -618,13 +613,13 @@ func BenchmarkHasBlockForkChoiceStore_DoublyLinkedTree(b *testing.B) {
 		store: &store.Store{},
 	}
 	s.store.SetFinalizedCheckpt(&ethpb.Checkpoint{Epoch: 0, Root: params.BeaconConfig().ZeroHash[:]})
-	blk := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}}}
-	r, err := blk.Block.HashTreeRoot()
+	block := &ethpb.SignedBeaconBlock{Block: &ethpb.BeaconBlock{Body: &ethpb.BeaconBlockBody{}}}
+	r, err := block.Block.HashTreeRoot()
 	require.NoError(b, err)
 	bs := &ethpb.BeaconState{FinalizedCheckpoint: &ethpb.Checkpoint{Root: make([]byte, 32)}, CurrentJustifiedCheckpoint: &ethpb.Checkpoint{Root: make([]byte, 32)}}
 	beaconState, err := v1.InitializeFromProto(bs)
 	require.NoError(b, err)
-	wsb, err := wrapper.WrappedSignedBeaconBlock(blk)
+	wsb, err := wrapper.WrappedSignedBeaconBlock(block)
 	require.NoError(b, err)
 	require.NoError(b, s.insertBlockAndAttestationsToForkChoiceStore(ctx, wsb.Block(), r, beaconState))

--- a/beacon-chain/blockchain/state_balance_cache.go
+++ b/beacon-chain/blockchain/state_balance_cache.go
@@ -24,7 +24,7 @@ type stateByRooter interface {
 	StateByRoot(context.Context, [32]byte) (state.BeaconState, error)
 }

-// newStateBalanceCache exists to remind us that stateBalanceCache needs a state gen
+// newStateBalanceCache exists to remind us that stateBalanceCache needs a stagegen
 // to avoid nil pointer bugs when updating the cache in the read path (get())
 func newStateBalanceCache(sg *stategen.State) (*stateBalanceCache, error) {
 	if sg == nil {
--- a/beacon-chain/blockchain/state_balance_cache_test.go
+++ b/beacon-chain/blockchain/state_balance_cache_test.go
@@ -6,15 +6,24 @@ import (
 	"errors"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	v2 "github.com/prysmaticlabs/prysm/beacon-chain/state/v2"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/time/slots"
 )

+type mockStateByRoot struct {
+	state state.BeaconState
+	err   error
+}
+
+func (m *mockStateByRoot) StateByRoot(context.Context, [32]byte) (state.BeaconState, error) {
+	return m.state, m.err
+}
+
 type testStateOpt func(*ethpb.BeaconStateAltair)

 func testStateWithValidators(v []*ethpb.Validator) testStateOpt {
--- a/beacon-chain/blockchain/store/new.go
+++ b/beacon-chain/blockchain/store/new.go
@@ -4,7 +4,6 @@ import (
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 )

-// New creates a store object.
 func New(justifiedCheckpt *ethpb.Checkpoint, finalizedCheckpt *ethpb.Checkpoint) *Store {
 	return &Store{
 		justifiedCheckpt:     justifiedCheckpt,
--- a/beacon-chain/blockchain/testing/BUILD.bazel
+++ b/beacon-chain/blockchain/testing/BUILD.bazel
@@ -22,11 +22,11 @@ go_library(
        "//beacon-chain/state:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
-        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
+        "//proto/prysm/v1alpha1/block:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
    ],
 )
--- a/beacon-chain/blockchain/testing/mock.go
+++ b/beacon-chain/blockchain/testing/mock.go
@@ -9,6 +9,7 @@ import (
 	"time"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/async/event"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/feed"
@@ -21,10 +22,9 @@ import (
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"github.com/sirupsen/logrus"
 )

@@ -47,10 +47,10 @@ type ChainService struct {
 	InitSyncBlockRoots          map[[32]byte]bool
 	DB                          db.Database
 	State                       state.BeaconState
-	Block                       interfaces.SignedBeaconBlock
+	Block                       block.SignedBeaconBlock
 	VerifyBlkDescendantErr      error
 	stateNotifier               statefeed.Notifier
-	BlocksReceived              []interfaces.SignedBeaconBlock
+	BlocksReceived              []block.SignedBeaconBlock
 	SyncCommitteeIndices        []types.CommitteeIndex
 	blockNotifier               blockfeed.Notifier
 	opNotifier                  opfeed.Notifier
@@ -61,7 +61,6 @@ type ChainService struct {
 	SyncCommitteePubkeys        [][]byte
 	Genesis                     time.Time
 	ForkChoiceStore             forkchoice.ForkChoicer
-	ReceiveBlockMockErr         error
 }

 // ForkChoicer mocks the same method in the chain service
@@ -165,7 +164,7 @@ func (mon *MockOperationNotifier) OperationFeed() *event.Feed {
 }

 // ReceiveBlockInitialSync mocks ReceiveBlockInitialSync method in chain service.
-func (s *ChainService) ReceiveBlockInitialSync(ctx context.Context, block interfaces.SignedBeaconBlock, _ [32]byte) error {
+func (s *ChainService) ReceiveBlockInitialSync(ctx context.Context, block block.SignedBeaconBlock, _ [32]byte) error {
 	if s.State == nil {
 		return ErrNilState
 	}
@@ -192,39 +191,36 @@ func (s *ChainService) ReceiveBlockInitialSync(ctx context.Context, block interf
 }

 // ReceiveBlockBatch processes blocks in batches from initial-sync.
-func (s *ChainService) ReceiveBlockBatch(ctx context.Context, blks []interfaces.SignedBeaconBlock, _ [][32]byte) error {
+func (s *ChainService) ReceiveBlockBatch(ctx context.Context, blks []block.SignedBeaconBlock, _ [][32]byte) error {
 	if s.State == nil {
 		return ErrNilState
 	}
-	for _, b := range blks {
-		if !bytes.Equal(s.Root, b.Block().ParentRoot()) {
-			return errors.Errorf("wanted %#x but got %#x", s.Root, b.Block().ParentRoot())
+	for _, block := range blks {
+		if !bytes.Equal(s.Root, block.Block().ParentRoot()) {
+			return errors.Errorf("wanted %#x but got %#x", s.Root, block.Block().ParentRoot())
 		}
-		if err := s.State.SetSlot(b.Block().Slot()); err != nil {
+		if err := s.State.SetSlot(block.Block().Slot()); err != nil {
 			return err
 		}
-		s.BlocksReceived = append(s.BlocksReceived, b)
-		signingRoot, err := b.Block().HashTreeRoot()
+		s.BlocksReceived = append(s.BlocksReceived, block)
+		signingRoot, err := block.Block().HashTreeRoot()
 		if err != nil {
 			return err
 		}
 		if s.DB != nil {
-			if err := s.DB.SaveBlock(ctx, b); err != nil {
+			if err := s.DB.SaveBlock(ctx, block); err != nil {
 				return err
 			}
-			logrus.Infof("Saved block with root: %#x at slot %d", signingRoot, b.Block().Slot())
+			logrus.Infof("Saved block with root: %#x at slot %d", signingRoot, block.Block().Slot())
 		}
 		s.Root = signingRoot[:]
-		s.Block = b
+		s.Block = block
 	}
 	return nil
 }

 // ReceiveBlock mocks ReceiveBlock method in chain service.
-func (s *ChainService) ReceiveBlock(ctx context.Context, block interfaces.SignedBeaconBlock, _ [32]byte) error {
-	if s.ReceiveBlockMockErr != nil {
-		return s.ReceiveBlockMockErr
-	}
+func (s *ChainService) ReceiveBlock(ctx context.Context, block block.SignedBeaconBlock, _ [32]byte) error {
 	if s.State == nil {
 		return ErrNilState
 	}
@@ -267,7 +263,7 @@ func (s *ChainService) HeadRoot(_ context.Context) ([]byte, error) {
 }

 // HeadBlock mocks HeadBlock method in chain service.
-func (s *ChainService) HeadBlock(context.Context) (interfaces.SignedBeaconBlock, error) {
+func (s *ChainService) HeadBlock(context.Context) (block.SignedBeaconBlock, error) {
 	return s.Block, nil
 }

@@ -301,6 +297,11 @@ func (_ *ChainService) ReceiveAttestation(_ context.Context, _ *ethpb.Attestatio
 	return nil
 }

+// ReceiveAttestationNoPubsub mocks ReceiveAttestationNoPubsub method in chain service.
+func (_ *ChainService) ReceiveAttestationNoPubsub(context.Context, *ethpb.Attestation) error {
+	return nil
+}
+
 // AttestationTargetState mocks AttestationTargetState method in chain service.
 func (s *ChainService) AttestationTargetState(_ context.Context, _ *ethpb.Checkpoint) (state.BeaconState, error) {
 	return s.State, nil
@@ -314,6 +315,11 @@ func (s *ChainService) HeadValidatorsIndices(ctx context.Context, epoch types.Ep
 	return helpers.ActiveValidatorIndices(ctx, s.State, epoch)
 }

+// HeadSeed mocks the same method in the chain service.
+func (s *ChainService) HeadSeed(_ context.Context, epoch types.Epoch) ([32]byte, error) {
+	return helpers.Seed(s.State, epoch, params.BeaconConfig().DomainBeaconAttester)
+}
+
 // HeadETH1Data provides the current ETH1Data of the head state.
 func (s *ChainService) HeadETH1Data() *ethpb.Eth1Data {
 	return s.ETH1Data
@@ -357,14 +363,8 @@ func (s *ChainService) IsCanonical(_ context.Context, r [32]byte) (bool, error)
 	return true, nil
 }

-// HasBlock mocks the same method in the chain service.
-func (s *ChainService) HasBlock(ctx context.Context, rt [32]byte) bool {
-	if s.DB == nil {
-		return false
-	}
-	if s.DB.HasBlock(ctx, rt) {
-		return true
-	}
+// HasInitSyncBlock mocks the same method in the chain service.
+func (s *ChainService) HasInitSyncBlock(rt [32]byte) bool {
 	if s.InitSyncBlockRoots == nil {
 		return false
 	}
@@ -377,7 +377,7 @@ func (_ *ChainService) HeadGenesisValidatorsRoot() [32]byte {
 }

 // VerifyBlkDescendant mocks VerifyBlkDescendant and always returns nil.
-func (s *ChainService) VerifyFinalizedBlkDescendant(_ context.Context, _ [32]byte) error {
+func (s *ChainService) VerifyBlkDescendant(_ context.Context, _ [32]byte) error {
 	return s.VerifyBlkDescendantErr
 }

@@ -417,7 +417,7 @@ func (s *ChainService) HeadValidatorIndexToPublicKey(_ context.Context, _ types.
 }

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

--- a/beacon-chain/blockchain/weak_subjectivity_checks.go
+++ b/beacon-chain/blockchain/weak_subjectivity_checks.go
@@ -5,9 +5,9 @@ import (
 	"fmt"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/db/filters"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/time/slots"
@@ -32,6 +32,9 @@ type WeakSubjectivityVerifier struct {

 // NewWeakSubjectivityVerifier validates a checkpoint, and if valid, uses it to initialize a weak subjectivity verifier
 func NewWeakSubjectivityVerifier(wsc *ethpb.Checkpoint, db weakSubjectivityDB) (*WeakSubjectivityVerifier, error) {
+	// TODO(7342): Weak subjectivity checks are currently optional. When we require the flag to be specified
+	// per 7342, a nil checkpoint, zero-root or zero-epoch should all fail validation
+	// and return an error instead of creating a WeakSubjectivityVerifier that permits any chain history.
 	if wsc == nil || len(wsc.Root) == 0 || wsc.Epoch == 0 {
 		log.Warn("No valid weak subjectivity checkpoint specified, running without weak subjectivity verification")
 		return &WeakSubjectivityVerifier{
--- a/beacon-chain/blockchain/weak_subjectivity_checks_test.go
+++ b/beacon-chain/blockchain/weak_subjectivity_checks_test.go
@@ -5,13 +5,13 @@ import (
 	"testing"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain/store"
 	testDB "github.com/prysmaticlabs/prysm/beacon-chain/db/testing"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
 	"github.com/prysmaticlabs/prysm/time/slots"
--- a/beacon-chain/cache/BUILD.bazel
+++ b/beacon-chain/cache/BUILD.bazel
@@ -13,7 +13,6 @@ go_library(
        "common.go",
        "doc.go",
        "error.go",
-        "payload_id.go",
        "proposer_indices.go",
        "proposer_indices_disabled.go",  # keep
        "proposer_indices_type.go",
@@ -27,14 +26,13 @@ go_library(
    importpath = "github.com/prysmaticlabs/prysm/beacon-chain/cache",
    visibility = [
        "//beacon-chain:__subpackages__",
-        "//testing/spectest:__subpackages__",
        "//tools:__subpackages__",
    ],
    deps = [
        "//beacon-chain/state:go_default_library",
        "//cache/lru:go_default_library",
+        "//config/features:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/primitives:go_default_library",
        "//container/slice:go_default_library",
        "//crypto/hash:go_default_library",
        "//crypto/rand:go_default_library",
@@ -47,6 +45,7 @@ go_library(
        "@com_github_pkg_errors//:go_default_library",
        "@com_github_prometheus_client_golang//prometheus:go_default_library",
        "@com_github_prometheus_client_golang//prometheus/promauto:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
        "@io_k8s_client_go//tools/cache:go_default_library",
        "@io_opencensus_go//trace:go_default_library",
    ],
@@ -62,7 +61,6 @@ go_test(
        "checkpoint_state_test.go",
        "committee_fuzz_test.go",
        "committee_test.go",
-        "payload_id_test.go",
        "proposer_indices_test.go",
        "skip_slot_cache_test.go",
        "subnet_ids_test.go",
@@ -76,15 +74,16 @@ go_test(
        "//beacon-chain/state/v1:go_default_library",
        "//beacon-chain/state/v2:go_default_library",
        "//beacon-chain/state/v3:go_default_library",
+        "//config/features:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/primitives:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
        "//testing/util:go_default_library",
        "@com_github_google_gofuzz//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
        "@org_golang_google_protobuf//proto:go_default_library",
    ],
 )
--- a/beacon-chain/cache/active_balance.go
+++ b/beacon-chain/cache/active_balance.go
@@ -11,10 +11,11 @@ import (
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
+	ethTypes "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	lruwrpr "github.com/prysmaticlabs/prysm/cache/lru"
+	"github.com/prysmaticlabs/prysm/config/features"
 	"github.com/prysmaticlabs/prysm/config/params"
-	ethTypes "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 )

 const (
@@ -50,6 +51,9 @@ func NewEffectiveBalanceCache() *BalanceCache {

 // AddTotalEffectiveBalance adds a new total effective balance entry for current balance for state `st` into the cache.
 func (c *BalanceCache) AddTotalEffectiveBalance(st state.ReadOnlyBeaconState, balance uint64) error {
+	if !features.Get().EnableActiveBalanceCache {
+		return nil
+	}
 	key, err := balanceCacheKey(st)
 	if err != nil {
 		return err
@@ -64,6 +68,9 @@ func (c *BalanceCache) AddTotalEffectiveBalance(st state.ReadOnlyBeaconState, ba

 // Get returns the current epoch's effective balance for state `st` in cache.
 func (c *BalanceCache) Get(st state.ReadOnlyBeaconState) (uint64, error) {
+	if !features.Get().EnableActiveBalanceCache {
+		return 0, ErrNotFound
+	}
 	key, err := balanceCacheKey(st)
 	if err != nil {
 		return 0, err
--- a/beacon-chain/cache/active_balance_test.go
+++ b/beacon-chain/cache/active_balance_test.go
@@ -1,6 +1,3 @@
-//go:build !fuzz
-// +build !fuzz
-
 package cache

 import (
@@ -8,14 +5,20 @@ import (
 	"math"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	state "github.com/prysmaticlabs/prysm/beacon-chain/state/v1"
+	"github.com/prysmaticlabs/prysm/config/features"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/require"
 )

 func TestBalanceCache_AddGetBalance(t *testing.T) {
+	resetCfg := features.InitWithReset(&features.Flags{
+		EnableActiveBalanceCache: true,
+	})
+	defer resetCfg()
+
 	blockRoots := make([][]byte, params.BeaconConfig().SlotsPerHistoricalRoot)
 	for i := 0; i < len(blockRoots); i++ {
 		b := make([]byte, 8)
--- a/beacon-chain/cache/checkpoint_state_test.go
+++ b/beacon-chain/cache/checkpoint_state_test.go
@@ -3,10 +3,10 @@ package cache
 import (
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	v1 "github.com/prysmaticlabs/prysm/beacon-chain/state/v1"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/assert"
--- a/beacon-chain/cache/committee.go
+++ b/beacon-chain/cache/committee.go
@@ -13,9 +13,9 @@ import (
 	lru "github.com/hashicorp/golang-lru"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
+	types "github.com/prysmaticlabs/eth2-types"
 	lruwrpr "github.com/prysmaticlabs/prysm/cache/lru"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/container/slice"
 	mathutil "github.com/prysmaticlabs/prysm/math"
 )
@@ -44,6 +44,7 @@ type CommitteeCache struct {
 	CommitteeCache *lru.Cache
 	lock           sync.RWMutex
 	inProgress     map[string]bool
+	disabled       bool
 }

 // committeeKeyFn takes the seed as the key to retrieve shuffled indices of a committee in a given epoch.
@@ -63,9 +64,20 @@ func NewCommitteesCache() *CommitteeCache {
 	}
 }

+func (c *CommitteeCache) Disable() {
+	c.disabled = true
+}
+
+func (c *CommitteeCache) Enable() {
+	c.disabled = false
+}
+
 // Committee fetches the shuffled indices by slot and committee index. Every list of indices
 // represent one committee. Returns true if the list exists with slot and committee index. Otherwise returns false, nil.
 func (c *CommitteeCache) Committee(ctx context.Context, slot types.Slot, seed [32]byte, index types.CommitteeIndex) ([]types.ValidatorIndex, error) {
+	if c.disabled {
+		return nil, nil
+	}
 	if err := c.checkInProgress(ctx, seed); err != nil {
 		return nil, err
 	}
@@ -116,6 +128,9 @@ func (c *CommitteeCache) AddCommitteeShuffledList(committees *Committees) error

 // ActiveIndices returns the active indices of a given seed stored in cache.
 func (c *CommitteeCache) ActiveIndices(ctx context.Context, seed [32]byte) ([]types.ValidatorIndex, error) {
+	if c.disabled {
+		return nil, nil
+	}
 	if err := c.checkInProgress(ctx, seed); err != nil {
 		return nil, err
 	}
@@ -138,6 +153,9 @@ func (c *CommitteeCache) ActiveIndices(ctx context.Context, seed [32]byte) ([]ty

 // ActiveIndicesCount returns the active indices count of a given seed stored in cache.
 func (c *CommitteeCache) ActiveIndicesCount(ctx context.Context, seed [32]byte) (int, error) {
+	if c.disabled {
+		return 0, nil
+	}
 	if err := c.checkInProgress(ctx, seed); err != nil {
 		return 0, err
 	}
@@ -160,6 +178,9 @@ func (c *CommitteeCache) ActiveIndicesCount(ctx context.Context, seed [32]byte)

 // HasEntry returns true if the committee cache has a value.
 func (c *CommitteeCache) HasEntry(seed string) bool {
+	if c.disabled {
+		return false
+	}
 	_, ok := c.CommitteeCache.Get(seed)
 	return ok
 }
--- a/beacon-chain/cache/committee_disabled.go
+++ b/beacon-chain/cache/committee_disabled.go
@@ -7,7 +7,7 @@ package cache
 import (
 	"context"

-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
+	types "github.com/prysmaticlabs/eth2-types"
 )

 // FakeCommitteeCache is a struct with 1 queue for looking up shuffled indices list by seed.
--- a/beacon-chain/cache/committee_fuzz_test.go
+++ b/beacon-chain/cache/committee_fuzz_test.go
@@ -1,6 +1,3 @@
-//go:build !fuzz
-// +build !fuzz
-
 package cache

 import (
--- a/beacon-chain/cache/committee_test.go
+++ b/beacon-chain/cache/committee_test.go
@@ -1,6 +1,3 @@
-//go:build !fuzz
-// +build !fuzz
-
 package cache

 import (
@@ -10,8 +7,8 @@ import (
 	"strconv"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
--- a/beacon-chain/cache/committees.go
+++ b/beacon-chain/cache/committees.go
@@ -3,7 +3,7 @@ package cache
 import (
 	"errors"

-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
+	types "github.com/prysmaticlabs/eth2-types"
 )

 // ErrNotCommittee will be returned when a cache object is not a pointer to
--- a/beacon-chain/cache/depositcache/deposits_cache.go
+++ b/beacon-chain/cache/depositcache/deposits_cache.go
@@ -36,7 +36,7 @@ type DepositFetcher interface {
 	DepositByPubkey(ctx context.Context, pubKey []byte) (*ethpb.Deposit, *big.Int)
 	DepositsNumberAndRootAtHeight(ctx context.Context, blockHeight *big.Int) (uint64, [32]byte)
 	FinalizedDeposits(ctx context.Context) *FinalizedDeposits
-	NonFinalizedDeposits(ctx context.Context, lastFinalizedIndex int64, untilBlk *big.Int) []*ethpb.Deposit
+	NonFinalizedDeposits(ctx context.Context, untilBlk *big.Int) []*ethpb.Deposit
 }

 // FinalizedDeposits stores the trie of deposits that have been included
@@ -137,22 +137,6 @@ func (dc *DepositCache) InsertFinalizedDeposits(ctx context.Context, eth1Deposit

 	depositTrie := dc.finalizedDeposits.Deposits
 	insertIndex := int(dc.finalizedDeposits.MerkleTrieIndex + 1)
-
-	// Don't insert into finalized trie if there is no deposit to
-	// insert.
-	if len(dc.deposits) == 0 {
-		return
-	}
-	// In the event we have less deposits than we need to
-	// finalize we finalize till the index on which we do have it.
-	if len(dc.deposits) <= int(eth1DepositIndex) {
-		eth1DepositIndex = int64(len(dc.deposits)) - 1
-	}
-	// If we finalize to some lower deposit index, we
-	// ignore it.
-	if int(eth1DepositIndex) < insertIndex {
-		return
-	}
 	for _, d := range dc.deposits {
 		if d.Index <= dc.finalizedDeposits.MerkleTrieIndex {
 			continue
@@ -262,7 +246,7 @@ func (dc *DepositCache) FinalizedDeposits(ctx context.Context) *FinalizedDeposit

 // NonFinalizedDeposits returns the list of non-finalized deposits until the given block number (inclusive).
 // If no block is specified then this method returns all non-finalized deposits.
-func (dc *DepositCache) NonFinalizedDeposits(ctx context.Context, lastFinalizedIndex int64, untilBlk *big.Int) []*ethpb.Deposit {
+func (dc *DepositCache) NonFinalizedDeposits(ctx context.Context, untilBlk *big.Int) []*ethpb.Deposit {
 	ctx, span := trace.StartSpan(ctx, "DepositsCache.NonFinalizedDeposits")
 	defer span.End()
 	dc.depositsLock.RLock()
@@ -272,9 +256,10 @@ func (dc *DepositCache) NonFinalizedDeposits(ctx context.Context, lastFinalizedI
 		return dc.allDeposits(untilBlk)
 	}

+	lastFinalizedDepositIndex := dc.finalizedDeposits.MerkleTrieIndex
 	var deposits []*ethpb.Deposit
 	for _, d := range dc.deposits {
-		if (d.Index > lastFinalizedIndex) && (untilBlk == nil || untilBlk.Uint64() >= d.Eth1BlockHeight) {
+		if (d.Index > lastFinalizedDepositIndex) && (untilBlk == nil || untilBlk.Uint64() >= d.Eth1BlockHeight) {
 			deposits = append(deposits, d.Deposit)
 		}
 	}
--- a/beacon-chain/cache/depositcache/deposits_cache_test.go
+++ b/beacon-chain/cache/depositcache/deposits_cache_test.go
@@ -459,7 +459,7 @@ func TestFinalizedDeposits_UtilizesPreviouslyCachedDeposits(t *testing.T) {
 			Index: 1,
 		},
 	}
-	newFinalizedDeposit := &ethpb.DepositContainer{
+	newFinalizedDeposit := ethpb.DepositContainer{
 		Deposit: &ethpb.Deposit{
 			Data: &ethpb.Deposit_Data{
 				PublicKey:             bytesutil.PadTo([]byte{2}, 48),
@@ -471,17 +471,17 @@ func TestFinalizedDeposits_UtilizesPreviouslyCachedDeposits(t *testing.T) {
 	}
 	dc.deposits = oldFinalizedDeposits
 	dc.InsertFinalizedDeposits(context.Background(), 1)
+	// Artificially exclude old deposits so that they can only be retrieved from previously finalized deposits.
+	dc.deposits = []*ethpb.DepositContainer{&newFinalizedDeposit}

 	dc.InsertFinalizedDeposits(context.Background(), 2)

-	dc.deposits = append(dc.deposits, []*ethpb.DepositContainer{newFinalizedDeposit}...)
-
 	cachedDeposits := dc.FinalizedDeposits(context.Background())
 	require.NotNil(t, cachedDeposits, "Deposits not cached")
-	assert.Equal(t, int64(1), cachedDeposits.MerkleTrieIndex)
+	assert.Equal(t, int64(2), cachedDeposits.MerkleTrieIndex)

 	var deps [][]byte
-	for _, d := range oldFinalizedDeposits {
+	for _, d := range append(oldFinalizedDeposits, &newFinalizedDeposit) {
 		hash, err := d.Deposit.Data.HashTreeRoot()
 		require.NoError(t, err, "Could not hash deposit data")
 		deps = append(deps, hash[:])
@@ -491,140 +491,6 @@ func TestFinalizedDeposits_UtilizesPreviouslyCachedDeposits(t *testing.T) {
 	assert.Equal(t, trie.HashTreeRoot(), cachedDeposits.Deposits.HashTreeRoot())
 }

-func TestFinalizedDeposits_HandleZeroDeposits(t *testing.T) {
-	dc, err := New()
-	require.NoError(t, err)
-
-	dc.InsertFinalizedDeposits(context.Background(), 2)
-
-	cachedDeposits := dc.FinalizedDeposits(context.Background())
-	require.NotNil(t, cachedDeposits, "Deposits not cached")
-	assert.Equal(t, int64(-1), cachedDeposits.MerkleTrieIndex)
-}
-
-func TestFinalizedDeposits_HandleSmallerThanExpectedDeposits(t *testing.T) {
-	dc, err := New()
-	require.NoError(t, err)
-
-	finalizedDeposits := []*ethpb.DepositContainer{
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{0}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 0,
-		},
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{1}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 1,
-		},
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{2}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 2,
-		},
-	}
-	dc.deposits = finalizedDeposits
-
-	dc.InsertFinalizedDeposits(context.Background(), 5)
-
-	cachedDeposits := dc.FinalizedDeposits(context.Background())
-	require.NotNil(t, cachedDeposits, "Deposits not cached")
-	assert.Equal(t, int64(2), cachedDeposits.MerkleTrieIndex)
-}
-
-func TestFinalizedDeposits_HandleLowerEth1DepositIndex(t *testing.T) {
-	dc, err := New()
-	require.NoError(t, err)
-
-	finalizedDeposits := []*ethpb.DepositContainer{
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{0}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 0,
-		},
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{1}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 1,
-		},
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{2}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 2,
-		},
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{3}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 3,
-		},
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{4}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 4,
-		},
-		{
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{5}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: 5,
-		},
-	}
-	dc.deposits = finalizedDeposits
-
-	dc.InsertFinalizedDeposits(context.Background(), 5)
-
-	// Reinsert finalized deposits with a lower index.
-	dc.InsertFinalizedDeposits(context.Background(), 2)
-
-	cachedDeposits := dc.FinalizedDeposits(context.Background())
-	require.NotNil(t, cachedDeposits, "Deposits not cached")
-	assert.Equal(t, int64(5), cachedDeposits.MerkleTrieIndex)
-}
-
 func TestFinalizedDeposits_InitializedCorrectly(t *testing.T) {
 	dc, err := New()
 	require.NoError(t, err)
@@ -688,7 +554,7 @@ func TestNonFinalizedDeposits_ReturnsAllNonFinalizedDeposits(t *testing.T) {
 		})
 	dc.InsertFinalizedDeposits(context.Background(), 1)

-	deps := dc.NonFinalizedDeposits(context.Background(), 1, nil)
+	deps := dc.NonFinalizedDeposits(context.Background(), nil)
 	assert.Equal(t, 2, len(deps))
 }

@@ -745,89 +611,10 @@ func TestNonFinalizedDeposits_ReturnsNonFinalizedDepositsUpToBlockNumber(t *test
 		})
 	dc.InsertFinalizedDeposits(context.Background(), 1)

-	deps := dc.NonFinalizedDeposits(context.Background(), 1, big.NewInt(10))
+	deps := dc.NonFinalizedDeposits(context.Background(), big.NewInt(10))
 	assert.Equal(t, 1, len(deps))
 }

-func TestFinalizedDeposits_ReturnsTrieCorrectly(t *testing.T) {
-	dc, err := New()
-	require.NoError(t, err)
-
-	generateCtr := func(height uint64, index int64) *ethpb.DepositContainer {
-		return &ethpb.DepositContainer{
-			Eth1BlockHeight: height,
-			Deposit: &ethpb.Deposit{
-				Data: &ethpb.Deposit_Data{
-					PublicKey:             bytesutil.PadTo([]byte{uint8(index)}, 48),
-					WithdrawalCredentials: make([]byte, 32),
-					Signature:             make([]byte, 96),
-				},
-			},
-			Index: index,
-		}
-	}
-
-	finalizedDeposits := []*ethpb.DepositContainer{
-		generateCtr(10, 0),
-		generateCtr(11, 1),
-		generateCtr(12, 2),
-		generateCtr(12, 3),
-		generateCtr(13, 4),
-		generateCtr(13, 5),
-		generateCtr(13, 6),
-		generateCtr(14, 7),
-	}
-	dc.deposits = append(finalizedDeposits,
-		generateCtr(15, 8),
-		generateCtr(15, 9),
-		generateCtr(30, 10))
-	trieItems := make([][]byte, 0, len(dc.deposits))
-	for _, dep := range dc.allDeposits(big.NewInt(30)) {
-		depHash, err := dep.Data.HashTreeRoot()
-		assert.NoError(t, err)
-		trieItems = append(trieItems, depHash[:])
-	}
-	depositTrie, err := trie.GenerateTrieFromItems(trieItems, params.BeaconConfig().DepositContractTreeDepth)
-	assert.NoError(t, err)
-
-	// Perform this in a non-sensical ordering
-	dc.InsertFinalizedDeposits(context.Background(), 10)
-	dc.InsertFinalizedDeposits(context.Background(), 2)
-	dc.InsertFinalizedDeposits(context.Background(), 3)
-	dc.InsertFinalizedDeposits(context.Background(), 4)
-
-	// Mimick finalized deposit trie fetch.
-	fd := dc.FinalizedDeposits(context.Background())
-	deps := dc.NonFinalizedDeposits(context.Background(), fd.MerkleTrieIndex, big.NewInt(14))
-	insertIndex := fd.MerkleTrieIndex + 1
-
-	for _, dep := range deps {
-		depHash, err := dep.Data.HashTreeRoot()
-		assert.NoError(t, err)
-		if err = fd.Deposits.Insert(depHash[:], int(insertIndex)); err != nil {
-			assert.NoError(t, err)
-		}
-		insertIndex++
-	}
-	dc.InsertFinalizedDeposits(context.Background(), 15)
-	dc.InsertFinalizedDeposits(context.Background(), 15)
-	dc.InsertFinalizedDeposits(context.Background(), 14)
-
-	fd = dc.FinalizedDeposits(context.Background())
-	deps = dc.NonFinalizedDeposits(context.Background(), fd.MerkleTrieIndex, big.NewInt(30))
-	insertIndex = fd.MerkleTrieIndex + 1
-
-	for _, dep := range deps {
-		depHash, err := dep.Data.HashTreeRoot()
-		assert.NoError(t, err)
-		if err = fd.Deposits.Insert(depHash[:], int(insertIndex)); err != nil {
-			assert.NoError(t, err)
-		}
-		insertIndex++
-	}
-	assert.Equal(t, fd.Deposits.NumOfItems(), depositTrie.NumOfItems())
-}
-
 func TestPruneProofs_Ok(t *testing.T) {
 	dc, err := New()
 	require.NoError(t, err)
--- a/beacon-chain/cache/payload_id.go
+++ b/beacon-chain/cache/payload_id.go
@@ -1,73 +0,0 @@
-package cache
-
-import (
-	"sync"
-
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
-)
-
-const vIdLength = 8
-const pIdLength = 8
-const vpIdsLength = vIdLength + pIdLength
-
-// ProposerPayloadIDsCache is a cache of proposer payload IDs.
-// The key is the slot. The value is the concatenation of the proposer and payload IDs. 8 bytes each.
-type ProposerPayloadIDsCache struct {
-	slotToProposerAndPayloadIDs map[types.Slot][vpIdsLength]byte
-	sync.RWMutex
-}
-
-// NewProposerPayloadIDsCache creates a new proposer payload IDs cache.
-func NewProposerPayloadIDsCache() *ProposerPayloadIDsCache {
-	return &ProposerPayloadIDsCache{
-		slotToProposerAndPayloadIDs: make(map[types.Slot][vpIdsLength]byte),
-	}
-}
-
-// GetProposerPayloadIDs returns the proposer and  payload IDs for the given slot.
-func (f *ProposerPayloadIDsCache) GetProposerPayloadIDs(slot types.Slot) (types.ValidatorIndex, [8]byte, bool) {
-	f.RLock()
-	defer f.RUnlock()
-	ids, ok := f.slotToProposerAndPayloadIDs[slot]
-	if !ok {
-		return 0, [8]byte{}, false
-	}
-	vId := ids[:vIdLength]
-
-	b := ids[vIdLength:]
-	var pId [pIdLength]byte
-	copy(pId[:], b)
-
-	return types.ValidatorIndex(bytesutil.BytesToUint64BigEndian(vId)), pId, true
-}
-
-// SetProposerAndPayloadIDs sets the proposer and payload IDs for the given slot.
-func (f *ProposerPayloadIDsCache) SetProposerAndPayloadIDs(slot types.Slot, vId types.ValidatorIndex, pId [8]byte) {
-	f.Lock()
-	defer f.Unlock()
-	var vIdBytes [vIdLength]byte
-	copy(vIdBytes[:], bytesutil.Uint64ToBytesBigEndian(uint64(vId)))
-
-	var bytes [vpIdsLength]byte
-	copy(bytes[:], append(vIdBytes[:], pId[:]...))
-
-	_, ok := f.slotToProposerAndPayloadIDs[slot]
-	// Ok to overwrite if the slot is already set but the payload ID is not set.
-	// This combats the re-org case where payload assignment could change the epoch of.
-	if !ok || (ok && pId != [pIdLength]byte{}) {
-		f.slotToProposerAndPayloadIDs[slot] = bytes
-	}
-}
-
-// PrunePayloadIDs removes the payload id entries that's current than input slot.
-func (f *ProposerPayloadIDsCache) PrunePayloadIDs(slot types.Slot) {
-	f.Lock()
-	defer f.Unlock()
-
-	for s := range f.slotToProposerAndPayloadIDs {
-		if slot > s {
-			delete(f.slotToProposerAndPayloadIDs, s)
-		}
-	}
-}
--- a/beacon-chain/cache/payload_id_test.go
+++ b/beacon-chain/cache/payload_id_test.go
@@ -1,60 +0,0 @@
-package cache
-
-import (
-	"testing"
-
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/testing/require"
-)
-
-func TestValidatorPayloadIDsCache_GetAndSaveValidatorPayloadIDs(t *testing.T) {
-	cache := NewProposerPayloadIDsCache()
-	i, p, ok := cache.GetProposerPayloadIDs(0)
-	require.Equal(t, false, ok)
-	require.Equal(t, types.ValidatorIndex(0), i)
-	require.Equal(t, [pIdLength]byte{}, p)
-
-	slot := types.Slot(1234)
-	vid := types.ValidatorIndex(34234324)
-	pid := [8]byte{1, 2, 3, 3, 7, 8, 7, 8}
-	cache.SetProposerAndPayloadIDs(slot, vid, pid)
-	i, p, ok = cache.GetProposerPayloadIDs(slot)
-	require.Equal(t, true, ok)
-	require.Equal(t, vid, i)
-	require.Equal(t, pid, p)
-
-	slot = types.Slot(9456456)
-	vid = types.ValidatorIndex(6786745)
-	cache.SetProposerAndPayloadIDs(slot, vid, [pIdLength]byte{})
-	i, p, ok = cache.GetProposerPayloadIDs(slot)
-	require.Equal(t, true, ok)
-	require.Equal(t, vid, i)
-	require.Equal(t, [pIdLength]byte{}, p)
-
-	// reset cache without pid
-	slot = types.Slot(9456456)
-	vid = types.ValidatorIndex(11111)
-	pid = [8]byte{3, 2, 3, 33, 72, 8, 7, 8}
-	cache.SetProposerAndPayloadIDs(slot, vid, pid)
-	i, p, ok = cache.GetProposerPayloadIDs(slot)
-	require.Equal(t, true, ok)
-	require.Equal(t, vid, i)
-	require.Equal(t, pid, p)
-
-	// reset cache with existing pid
-	slot = types.Slot(9456456)
-	vid = types.ValidatorIndex(11111)
-	newPid := [8]byte{1, 2, 3, 33, 72, 8, 7, 1}
-	cache.SetProposerAndPayloadIDs(slot, vid, newPid)
-	i, p, ok = cache.GetProposerPayloadIDs(slot)
-	require.Equal(t, true, ok)
-	require.Equal(t, vid, i)
-	require.Equal(t, newPid, p)
-
-	// remove cache entry
-	cache.PrunePayloadIDs(slot + 1)
-	i, p, ok = cache.GetProposerPayloadIDs(slot)
-	require.Equal(t, false, ok)
-	require.Equal(t, types.ValidatorIndex(0), i)
-	require.Equal(t, [pIdLength]byte{}, p)
-}
--- a/beacon-chain/cache/proposer_indices.go
+++ b/beacon-chain/cache/proposer_indices.go
@@ -8,7 +8,7 @@ import (

 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
+	types "github.com/prysmaticlabs/eth2-types"
 	"k8s.io/client-go/tools/cache"
 )

@@ -31,7 +31,7 @@ var (

 // ProposerIndicesCache is a struct with 1 queue for looking up proposer indices by root.
 type ProposerIndicesCache struct {
-	proposerIndicesCache *cache.FIFO
+	ProposerIndicesCache *cache.FIFO
 	lock                 sync.RWMutex
 }

@@ -48,7 +48,7 @@ func proposerIndicesKeyFn(obj interface{}) (string, error) {
 // NewProposerIndicesCache creates a new proposer indices cache for storing/accessing proposer index assignments of an epoch.
 func NewProposerIndicesCache() *ProposerIndicesCache {
 	return &ProposerIndicesCache{
-		proposerIndicesCache: cache.NewFIFO(proposerIndicesKeyFn),
+		ProposerIndicesCache: cache.NewFIFO(proposerIndicesKeyFn),
 	}
 }

@@ -58,10 +58,10 @@ func (c *ProposerIndicesCache) AddProposerIndices(p *ProposerIndices) error {
 	c.lock.Lock()
 	defer c.lock.Unlock()

-	if err := c.proposerIndicesCache.AddIfNotPresent(p); err != nil {
+	if err := c.ProposerIndicesCache.AddIfNotPresent(p); err != nil {
 		return err
 	}
-	trim(c.proposerIndicesCache, maxProposerIndicesCacheSize)
+	trim(c.ProposerIndicesCache, maxProposerIndicesCacheSize)
 	return nil
 }

@@ -69,7 +69,7 @@ func (c *ProposerIndicesCache) AddProposerIndices(p *ProposerIndices) error {
 func (c *ProposerIndicesCache) HasProposerIndices(r [32]byte) (bool, error) {
 	c.lock.RLock()
 	defer c.lock.RUnlock()
-	_, exists, err := c.proposerIndicesCache.GetByKey(key(r))
+	_, exists, err := c.ProposerIndicesCache.GetByKey(key(r))
 	if err != nil {
 		return false, err
 	}
@@ -80,7 +80,7 @@ func (c *ProposerIndicesCache) HasProposerIndices(r [32]byte) (bool, error) {
 func (c *ProposerIndicesCache) ProposerIndices(r [32]byte) ([]types.ValidatorIndex, error) {
 	c.lock.RLock()
 	defer c.lock.RUnlock()
-	obj, exists, err := c.proposerIndicesCache.GetByKey(key(r))
+	obj, exists, err := c.ProposerIndicesCache.GetByKey(key(r))
 	if err != nil {
 		return nil, err
 	}
@@ -99,8 +99,3 @@ func (c *ProposerIndicesCache) ProposerIndices(r [32]byte) ([]types.ValidatorInd

 	return item.ProposerIndices, nil
 }
-
-// Len returns the number of keys in the underlying cache.
-func (c *ProposerIndicesCache) Len() int {
-	return len(c.proposerIndicesCache.ListKeys())
-}
--- a/beacon-chain/cache/proposer_indices_disabled.go
+++ b/beacon-chain/cache/proposer_indices_disabled.go
@@ -4,7 +4,7 @@
 // This file is used in fuzzer builds to bypass proposer indices caches.
 package cache

-import types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
+import types "github.com/prysmaticlabs/eth2-types"

 // FakeProposerIndicesCache is a struct with 1 queue for looking up proposer indices by root.
 type FakeProposerIndicesCache struct {
@@ -30,7 +30,3 @@ func (c *FakeProposerIndicesCache) ProposerIndices(r [32]byte) ([]types.Validato
 func (c *FakeProposerIndicesCache) HasProposerIndices(r [32]byte) (bool, error) {
 	return false, nil
 }
-
-func (c *FakeProposerIndicesCache) Len() int {
-	return 0
-}
--- a/beacon-chain/cache/proposer_indices_test.go
+++ b/beacon-chain/cache/proposer_indices_test.go
@@ -1,13 +1,10 @@
-//go:build !fuzz
-// +build !fuzz
-
 package cache

 import (
 	"strconv"
 	"testing"

-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
@@ -71,5 +68,7 @@ func TestProposerCache_CanRotate(t *testing.T) {
 		item := &ProposerIndices{BlockRoot: bytesutil.ToBytes32(s)}
 		require.NoError(t, cache.AddProposerIndices(item))
 	}
-	assert.Equal(t, int(maxProposerIndicesCacheSize), cache.Len())
+
+	k := cache.ProposerIndicesCache.ListKeys()
+	assert.Equal(t, maxProposerIndicesCacheSize, uint64(len(k)))
 }
--- a/beacon-chain/cache/proposer_indices_type.go
+++ b/beacon-chain/cache/proposer_indices_type.go
@@ -3,7 +3,7 @@ package cache
 import (
 	"errors"

-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
+	types "github.com/prysmaticlabs/eth2-types"
 )

 // ErrNotProposerIndices will be returned when a cache object is not a pointer to
--- a/beacon-chain/cache/subnet_ids.go
+++ b/beacon-chain/cache/subnet_ids.go
@@ -6,9 +6,9 @@ import (

 	lru "github.com/hashicorp/golang-lru"
 	"github.com/patrickmn/go-cache"
+	types "github.com/prysmaticlabs/eth2-types"
 	lruwrpr "github.com/prysmaticlabs/prysm/cache/lru"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/container/slice"
 )

--- a/beacon-chain/cache/subnet_ids_test.go
+++ b/beacon-chain/cache/subnet_ids_test.go
@@ -3,8 +3,8 @@ package cache
 import (
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
 )
--- a/beacon-chain/cache/sync_committee.go
+++ b/beacon-chain/cache/sync_committee.go
@@ -8,8 +8,8 @@ import (

 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	"k8s.io/client-go/tools/cache"
 )
--- a/beacon-chain/cache/sync_committee_disabled.go
+++ b/beacon-chain/cache/sync_committee_disabled.go
@@ -4,8 +4,8 @@
 package cache

 import (
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 )

 // FakeSyncCommitteeCache is a fake `SyncCommitteeCache` to satisfy fuzzing.
--- a/beacon-chain/cache/sync_committee_head_state.go
+++ b/beacon-chain/cache/sync_committee_head_state.go
@@ -4,9 +4,9 @@ import (
 	"sync"

 	lru "github.com/hashicorp/golang-lru"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	lruwrpr "github.com/prysmaticlabs/prysm/cache/lru"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/runtime/version"
 )

--- a/beacon-chain/cache/sync_committee_head_state_test.go
+++ b/beacon-chain/cache/sync_committee_head_state_test.go
@@ -3,12 +3,12 @@ package cache
 import (
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	v1 "github.com/prysmaticlabs/prysm/beacon-chain/state/v1"
 	v2 "github.com/prysmaticlabs/prysm/beacon-chain/state/v2"
 	v3 "github.com/prysmaticlabs/prysm/beacon-chain/state/v3"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/require"
 )
--- a/beacon-chain/cache/sync_committee_test.go
+++ b/beacon-chain/cache/sync_committee_test.go
@@ -3,8 +3,8 @@ package cache_test
 import (
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/cache"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
--- a/beacon-chain/cache/sync_subnet_ids.go
+++ b/beacon-chain/cache/sync_subnet_ids.go
@@ -5,8 +5,8 @@ import (
 	"time"

 	"github.com/patrickmn/go-cache"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/container/slice"
 	"github.com/prysmaticlabs/prysm/crypto/rand"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
--- a/beacon-chain/core/altair/BUILD.bazel
+++ b/beacon-chain/core/altair/BUILD.bazel
@@ -32,17 +32,17 @@ go_library(
        "//beacon-chain/state/v2:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
-        "//consensus-types/primitives:go_default_library",
        "//crypto/bls:go_default_library",
        "//crypto/hash:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//math:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//proto/prysm/v1alpha1/attestation:go_default_library",
+        "//proto/prysm/v1alpha1/block:go_default_library",
        "//runtime/version:go_default_library",
        "//time/slots:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@io_opencensus_go//trace:go_default_library",
    ],
@@ -75,20 +75,20 @@ go_test(
        "//beacon-chain/state/v3:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/primitives:go_default_library",
-        "//consensus-types/wrapper:go_default_library",
        "//container/trie:go_default_library",
        "//crypto/bls:go_default_library",
        "//encoding/bytesutil:go_default_library",
        "//math:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//proto/prysm/v1alpha1/attestation:go_default_library",
+        "//proto/prysm/v1alpha1/wrapper:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
        "//testing/util:go_default_library",
        "//time:go_default_library",
        "//time/slots:go_default_library",
        "@com_github_google_gofuzz//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
        "@com_github_prysmaticlabs_go_bitfield//:go_default_library",
        "@org_golang_google_protobuf//proto:go_default_library",
    ],
--- a/beacon-chain/core/altair/attestation.go
+++ b/beacon-chain/core/altair/attestation.go
@@ -6,15 +6,15 @@ import (
 	"fmt"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/attestation"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"go.opencensus.io/trace"
 )

@@ -23,7 +23,7 @@ import (
 func ProcessAttestationsNoVerifySignature(
 	ctx context.Context,
 	beaconState state.BeaconState,
-	b interfaces.SignedBeaconBlock,
+	b block.SignedBeaconBlock,
 ) (state.BeaconState, error) {
 	if err := helpers.BeaconBlockIsNil(b); err != nil {
 		return nil, err
--- a/beacon-chain/core/altair/attestation_test.go
+++ b/beacon-chain/core/altair/attestation_test.go
@@ -6,6 +6,7 @@ import (
 	"testing"

 	fuzz "github.com/google/gofuzz"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/go-bitfield"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/altair"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
@@ -15,12 +16,11 @@ import (
 	stateAltair "github.com/prysmaticlabs/prysm/beacon-chain/state/v2"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
-	"github.com/prysmaticlabs/prysm/consensus-types/wrapper"
 	"github.com/prysmaticlabs/prysm/crypto/bls"
 	"github.com/prysmaticlabs/prysm/math"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/attestation"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
 )
--- a/beacon-chain/core/altair/block.go
+++ b/beacon-chain/core/altair/block.go
@@ -4,12 +4,12 @@ import (
 	"context"
 	"errors"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/signing"
 	p2pType "github.com/prysmaticlabs/prysm/beacon-chain/p2p/types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/crypto/bls"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
--- a/beacon-chain/core/altair/block_test.go
+++ b/beacon-chain/core/altair/block_test.go
@@ -5,6 +5,7 @@ import (
 	"math"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/go-bitfield"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/altair"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
@@ -13,7 +14,6 @@ import (
 	p2pType "github.com/prysmaticlabs/prysm/beacon-chain/p2p/types"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/crypto/bls"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
--- a/beacon-chain/core/altair/epoch_precompute_test.go
+++ b/beacon-chain/core/altair/epoch_precompute_test.go
@@ -5,12 +5,12 @@ import (
 	"math"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch/precompute"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	stateAltair "github.com/prysmaticlabs/prysm/beacon-chain/state/v2"
 	v3 "github.com/prysmaticlabs/prysm/beacon-chain/state/v3"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/assert"
 	"github.com/prysmaticlabs/prysm/testing/require"
--- a/beacon-chain/core/altair/epoch_spec_test.go
+++ b/beacon-chain/core/altair/epoch_spec_test.go
@@ -6,13 +6,13 @@ import (
 	"math"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/altair"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/epoch"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/time"
 	stateAltair "github.com/prysmaticlabs/prysm/beacon-chain/state/v2"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/assert"
--- a/beacon-chain/core/altair/reward.go
+++ b/beacon-chain/core/altair/reward.go
@@ -2,10 +2,10 @@ package altair

 import (
 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/math"
 )

--- a/beacon-chain/core/altair/reward_test.go
+++ b/beacon-chain/core/altair/reward_test.go
@@ -4,10 +4,10 @@ import (
 	"math"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/altair"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/testing/require"
 	"github.com/prysmaticlabs/prysm/testing/util"
 )
--- a/beacon-chain/core/altair/sync_committee.go
+++ b/beacon-chain/core/altair/sync_committee.go
@@ -6,12 +6,12 @@ import (
 	"time"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	coreTime "github.com/prysmaticlabs/prysm/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/crypto/bls"
 	"github.com/prysmaticlabs/prysm/crypto/hash"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
--- a/beacon-chain/core/altair/sync_committee_test.go
+++ b/beacon-chain/core/altair/sync_committee_test.go
@@ -5,13 +5,13 @@ import (
 	"testing"
 	"time"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/altair"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	stateAltair "github.com/prysmaticlabs/prysm/beacon-chain/state/v2"
 	v2 "github.com/prysmaticlabs/prysm/beacon-chain/state/v2"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/crypto/bls"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/testing/assert"
--- a/beacon-chain/core/altair/upgrade_test.go
+++ b/beacon-chain/core/altair/upgrade_test.go
@@ -4,12 +4,12 @@ import (
 	"context"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/go-bitfield"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/altair"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/attestation"
 	"github.com/prysmaticlabs/prysm/testing/require"
--- a/beacon-chain/core/blocks/BUILD.bazel
+++ b/beacon-chain/core/blocks/BUILD.bazel
@@ -31,9 +31,6 @@ go_library(
        "//beacon-chain/state:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/interfaces:go_default_library",
-        "//consensus-types/primitives:go_default_library",
-        "//consensus-types/wrapper:go_default_library",
        "//container/slice:go_default_library",
        "//container/trie:go_default_library",
        "//contracts/deposit:go_default_library",
@@ -46,10 +43,13 @@ go_library(
        "//proto/engine/v1:go_default_library",
        "//proto/prysm/v1alpha1:go_default_library",
        "//proto/prysm/v1alpha1/attestation:go_default_library",
+        "//proto/prysm/v1alpha1/block:go_default_library",
        "//proto/prysm/v1alpha1/slashings:go_default_library",
+        "//proto/prysm/v1alpha1/wrapper:go_default_library",
        "//runtime/version:go_default_library",
        "//time/slots:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//: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",
@@ -89,8 +89,6 @@ go_test(
        "//beacon-chain/state/v1:go_default_library",
        "//config/fieldparams:go_default_library",
        "//config/params:go_default_library",
-        "//consensus-types/primitives:go_default_library",
-        "//consensus-types/wrapper:go_default_library",
        "//container/trie:go_default_library",
        "//crypto/bls:go_default_library",
        "//encoding/bytesutil:go_default_library",
@@ -100,6 +98,7 @@ go_test(
        "//proto/prysm/v1alpha1/attestation:go_default_library",
        "//proto/prysm/v1alpha1/attestation/aggregation:go_default_library",
        "//proto/prysm/v1alpha1/attestation/aggregation/attestations:go_default_library",
+        "//proto/prysm/v1alpha1/wrapper:go_default_library",
        "//runtime/version:go_default_library",
        "//testing/assert:go_default_library",
        "//testing/require:go_default_library",
@@ -107,6 +106,7 @@ go_test(
        "//time/slots:go_default_library",
        "@com_github_google_gofuzz//:go_default_library",
        "@com_github_pkg_errors//:go_default_library",
+        "@com_github_prysmaticlabs_eth2_types//:go_default_library",
        "@com_github_prysmaticlabs_go_bitfield//:go_default_library",
        "@com_github_sirupsen_logrus//:go_default_library",
        "@org_golang_google_protobuf//proto:go_default_library",
--- a/beacon-chain/core/blocks/attestation.go
+++ b/beacon-chain/core/blocks/attestation.go
@@ -5,16 +5,16 @@ import (
 	"fmt"

 	"github.com/pkg/errors"
+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/signing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/time"
 	"github.com/prysmaticlabs/prysm/beacon-chain/state"
 	"github.com/prysmaticlabs/prysm/config/params"
-	"github.com/prysmaticlabs/prysm/consensus-types/interfaces"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/crypto/bls"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/attestation"
+	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
 	"go.opencensus.io/trace"
 )

@@ -23,7 +23,7 @@ import (
 func ProcessAttestationsNoVerifySignature(
 	ctx context.Context,
 	beaconState state.BeaconState,
-	b interfaces.SignedBeaconBlock,
+	b block.SignedBeaconBlock,
 ) (state.BeaconState, error) {
 	if err := helpers.BeaconBlockIsNil(b); err != nil {
 		return nil, err
--- a/beacon-chain/core/blocks/attestation_regression_test.go
+++ b/beacon-chain/core/blocks/attestation_regression_test.go
@@ -2,7 +2,7 @@ package blocks_test

 import (
 	"context"
-	"os"
+	"io/ioutil"
 	"testing"

 	"github.com/prysmaticlabs/go-bitfield"
@@ -20,7 +20,7 @@ import (
 // valid att.Data.Committee index would be 0, so this is an off by one error.
 // See: https://github.com/sigp/beacon-fuzz/issues/78
 func TestProcessAttestationNoVerifySignature_BeaconFuzzIssue78(t *testing.T) {
-	attData, err := os.ReadFile("testdata/beaconfuzz_78_attestation.ssz")
+	attData, err := ioutil.ReadFile("testdata/beaconfuzz_78_attestation.ssz")
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -28,7 +28,7 @@ func TestProcessAttestationNoVerifySignature_BeaconFuzzIssue78(t *testing.T) {
 	if err := att.UnmarshalSSZ(attData); err != nil {
 		t.Fatal(err)
 	}
-	stateData, err := os.ReadFile("testdata/beaconfuzz_78_beacon.ssz")
+	stateData, err := ioutil.ReadFile("testdata/beaconfuzz_78_beacon.ssz")
 	if err != nil {
 		t.Fatal(err)
 	}
--- a/beacon-chain/core/blocks/attestation_test.go
+++ b/beacon-chain/core/blocks/attestation_test.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"testing"

+	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/go-bitfield"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
 	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
@@ -11,7 +12,6 @@ import (
 	v1 "github.com/prysmaticlabs/prysm/beacon-chain/state/v1"
 	fieldparams "github.com/prysmaticlabs/prysm/config/fieldparams"
 	"github.com/prysmaticlabs/prysm/config/params"
-	types "github.com/prysmaticlabs/prysm/consensus-types/primitives"
 	"github.com/prysmaticlabs/prysm/crypto/bls"
 	"github.com/prysmaticlabs/prysm/encoding/bytesutil"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
nisdas	c0d1d4f75e	add everything	2022-03-29 22:48:06 +08:00
nisdas	9cba1012f2	add important skip slot check	2022-03-29 22:39:05 +08:00