diff --git a/beacon-chain/sync/BUILD.bazel b/beacon-chain/sync/BUILD.bazel
index dfc0d622de..04cda5fc3e 100644
--- a/beacon-chain/sync/BUILD.bazel
+++ b/beacon-chain/sync/BUILD.bazel
@@ -91,6 +91,7 @@ go_library(
         "//shared/sszutil:go_default_library",
         "//shared/timeutils:go_default_library",
         "//shared/traceutil:go_default_library",
+        "//shared/version:go_default_library",
         "@com_github_hashicorp_golang_lru//:go_default_library",
         "@com_github_kevinms_leakybucket_go//:go_default_library",
         "@com_github_libp2p_go_libp2p_core//:go_default_library",
@@ -123,6 +124,7 @@ go_test(
         "rate_limiter_test.go",
         "rpc_beacon_blocks_by_range_test.go",
         "rpc_beacon_blocks_by_root_test.go",
+        "rpc_chunked_response_test.go",
         "rpc_goodbye_test.go",
         "rpc_metadata_test.go",
         "rpc_ping_test.go",
@@ -148,6 +150,7 @@ go_test(
     embed = [":go_default_library"],
     shard_count = 4,
     deps = [
+        "//beacon-chain/blockchain:go_default_library",
         "//beacon-chain/blockchain/testing:go_default_library",
         "//beacon-chain/cache:go_default_library",
         "//beacon-chain/core/altair:go_default_library",
diff --git a/beacon-chain/sync/context.go b/beacon-chain/sync/context.go
index 21db7ff08c..785e9708cf 100644
--- a/beacon-chain/sync/context.go
+++ b/beacon-chain/sync/context.go
@@ -1,15 +1,21 @@
 package sync
 
 import (
-	"errors"
-
 	"github.com/libp2p/go-libp2p-core/network"
+	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 )
 
+// Specifies the fixed size context length.
+const forkDigestLength = 4
+
 // writes peer's current context for the expected payload to the stream.
-func writeContextToStream(stream network.Stream, chain blockchain.ChainInfoFetcher) error {
+func writeContextToStream(objCtx []byte, stream network.Stream, chain blockchain.ChainInfoFetcher) error {
+	// The rpc context for our v2 methods is the fork-digest of
+	// the relevant payload. We write the associated fork-digest(context)
+	// into the stream for the payload.
 	rpcCtx, err := rpcContext(stream, chain)
 	if err != nil {
 		return err
@@ -18,6 +24,10 @@ func writeContextToStream(stream network.Stream, chain blockchain.ChainInfoFetch
 	if len(rpcCtx) == 0 {
 		return nil
 	}
+	// Always choose the object's context when writing to the stream.
+	if objCtx != nil {
+		rpcCtx = objCtx
+	}
 	_, err = stream.Write(rpcCtx)
 	return err
 }
@@ -32,7 +42,7 @@ func readContextFromStream(stream network.Stream, chain blockchain.ChainInfoFetc
 		return []byte{}, nil
 	}
 	// Read context (fork-digest) from stream
-	b := make([]byte, 4)
+	b := make([]byte, forkDigestLength)
 	if _, err := stream.Read(b); err != nil {
 		return nil, err
 	}
@@ -49,6 +59,14 @@ func rpcContext(stream network.Stream, chain blockchain.ChainInfoFetcher) ([]byt
 	case p2p.SchemaVersionV1:
 		// Return empty context for a v1 method.
 		return []byte{}, nil
+	case p2p.SchemaVersionV2:
+		currFork := chain.CurrentFork()
+		genRoot := chain.GenesisValidatorRoot()
+		digest, err := helpers.ComputeForkDigest(currFork.CurrentVersion, genRoot[:])
+		if err != nil {
+			return nil, err
+		}
+		return digest[:], nil
 	default:
 		return nil, errors.New("invalid version of %s registered for topic: %s")
 	}
diff --git a/beacon-chain/sync/context_test.go b/beacon-chain/sync/context_test.go
index c70e3d9a5e..169e8232a0 100644
--- a/beacon-chain/sync/context_test.go
+++ b/beacon-chain/sync/context_test.go
@@ -30,7 +30,7 @@ func TestContextWrite_NoWrites(t *testing.T) {
 	assert.NoError(t, err)
 
 	// Nothing will be written to the stream
-	assert.NoError(t, writeContextToStream(strm, nil))
+	assert.NoError(t, writeContextToStream(nil, strm, nil))
 	if testutil.WaitTimeout(wg, 1*time.Second) {
 		t.Fatal("Did not receive stream within 1 sec")
 	}
diff --git a/beacon-chain/sync/initial-sync/blocks_fetcher_test.go b/beacon-chain/sync/initial-sync/blocks_fetcher_test.go
index 43e2b27e50..2c975e6b49 100644
--- a/beacon-chain/sync/initial-sync/blocks_fetcher_test.go
+++ b/beacon-chain/sync/initial-sync/blocks_fetcher_test.go
@@ -281,6 +281,8 @@ func TestBlocksFetcher_RoundRobin(t *testing.T) {
 				FinalizedCheckPoint: &eth.Checkpoint{
 					Epoch: 0,
 				},
+				Genesis:        time.Now(),
+				ValidatorsRoot: [32]byte{},
 			}
 
 			ctx, cancel := context.WithCancel(context.Background())
@@ -414,7 +416,8 @@ func TestBlocksFetcher_handleRequest(t *testing.T) {
 	}
 
 	mc, p2p, _ := initializeTestServices(t, chainConfig.expectedBlockSlots, chainConfig.peers)
-
+	mc.ValidatorsRoot = [32]byte{}
+	mc.Genesis = time.Now()
 	t.Run("context cancellation", func(t *testing.T) {
 		ctx, cancel := context.WithCancel(context.Background())
 		fetcher := newBlocksFetcher(ctx, &blocksFetcherConfig{
@@ -547,7 +550,7 @@ func TestBlocksFetcher_RequestBlocksRateLimitingLocks(t *testing.T) {
 	defer cancel()
 	fetcher := newBlocksFetcher(ctx, &blocksFetcherConfig{p2p: p1})
 	fetcher.rateLimiter = leakybucket.NewCollector(float64(req.Count), int64(req.Count*burstFactor), false)
-
+	fetcher.chain = &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
 	hook := logTest.NewGlobal()
 	wg := new(sync.WaitGroup)
 	wg.Add(1)
@@ -610,7 +613,8 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 					for i := req.StartSlot; i < req.StartSlot.Add(req.Count*req.Step); i += types.Slot(req.Step) {
 						blk := testutil.NewBeaconBlock()
 						blk.Block.Slot = i
-						assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+						mchain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+						assert.NoError(t, beaconsync.WriteBlockChunk(stream, mchain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 					}
 					assert.NoError(t, stream.Close())
 				}
@@ -631,7 +635,8 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 					for i := req.StartSlot; i < req.StartSlot.Add(req.Count*req.Step+1); i += types.Slot(req.Step) {
 						blk := testutil.NewBeaconBlock()
 						blk.Block.Slot = i
-						assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+						chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+						assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 					}
 					assert.NoError(t, stream.Close())
 				}
@@ -652,11 +657,12 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 				return func(stream network.Stream) {
 					blk := testutil.NewBeaconBlock()
 					blk.Block.Slot = 163
-					assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+					chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+					assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 
 					blk = testutil.NewBeaconBlock()
 					blk.Block.Slot = 162
-					assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+					assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 					assert.NoError(t, stream.Close())
 				}
 			},
@@ -676,11 +682,13 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 				return func(stream network.Stream) {
 					blk := testutil.NewBeaconBlock()
 					blk.Block.Slot = 160
-					assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+					chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+
+					assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 
 					blk = testutil.NewBeaconBlock()
 					blk.Block.Slot = 160
-					assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+					assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 					assert.NoError(t, stream.Close())
 				}
 			},
@@ -703,14 +711,15 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 					}()
 					for i := req.StartSlot; i < req.StartSlot.Add(req.Count*req.Step); i += types.Slot(req.Step) {
 						blk := testutil.NewBeaconBlock()
+						chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
 						// Patch mid block, with invalid slot number.
 						if i == req.StartSlot.Add(req.Count*req.Step/2) {
 							blk.Block.Slot = req.StartSlot - 1
-							assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+							assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 							break
 						} else {
 							blk.Block.Slot = i
-							assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+							assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 						}
 					}
 				}
@@ -734,14 +743,15 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 					}()
 					for i := req.StartSlot; i < req.StartSlot.Add(req.Count*req.Step); i += types.Slot(req.Step) {
 						blk := testutil.NewBeaconBlock()
+						chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
 						// Patch mid block, with invalid slot number.
 						if i == req.StartSlot.Add(req.Count*req.Step/2) {
 							blk.Block.Slot = req.StartSlot.Add(req.Count * req.Step)
-							assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+							assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 							break
 						} else {
 							blk.Block.Slot = i
-							assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+							assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 						}
 					}
 				}
@@ -762,11 +772,12 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 				return func(stream network.Stream) {
 					blk := testutil.NewBeaconBlock()
 					blk.Block.Slot = 100
-					assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+					chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+					assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 
 					blk = testutil.NewBeaconBlock()
 					blk.Block.Slot = 105
-					assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+					assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 					assert.NoError(t, stream.Close())
 				}
 			},
@@ -785,11 +796,12 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 				return func(stream network.Stream) {
 					blk := testutil.NewBeaconBlock()
 					blk.Block.Slot = 100
-					assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+					chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+					assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 
 					blk = testutil.NewBeaconBlock()
 					blk.Block.Slot = 103
-					assert.NoError(t, beaconsync.WriteChunk(stream, nil, p1.Encoding(), blk))
+					assert.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p1.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blk)))
 					assert.NoError(t, stream.Close())
 				}
 			},
@@ -805,7 +817,7 @@ func TestBlocksFetcher_requestBlocksFromPeerReturningInvalidBlocks(t *testing.T)
 
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	fetcher := newBlocksFetcher(ctx, &blocksFetcherConfig{p2p: p1})
+	fetcher := newBlocksFetcher(ctx, &blocksFetcherConfig{p2p: p1, chain: &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}})
 	fetcher.rateLimiter = leakybucket.NewCollector(0.000001, 640, false)
 
 	for _, tt := range tests {
diff --git a/beacon-chain/sync/initial-sync/blocks_fetcher_utils_test.go b/beacon-chain/sync/initial-sync/blocks_fetcher_utils_test.go
index 68e90e748d..f0b5073c51 100644
--- a/beacon-chain/sync/initial-sync/blocks_fetcher_utils_test.go
+++ b/beacon-chain/sync/initial-sync/blocks_fetcher_utils_test.go
@@ -178,6 +178,8 @@ func TestBlocksFetcher_findFork(t *testing.T) {
 			Epoch: finalizedEpoch,
 			Root:  []byte(fmt.Sprintf("finalized_root %d", finalizedEpoch)),
 		},
+		Genesis:        time.Now(),
+		ValidatorsRoot: [32]byte{},
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -321,9 +323,11 @@ func TestBlocksFetcher_findForkWithPeer(t *testing.T) {
 	st, err := testutil.NewBeaconState()
 	require.NoError(t, err)
 	mc := &mock.ChainService{
-		State: st,
-		Root:  genesisRoot[:],
-		DB:    beaconDB,
+		State:          st,
+		Root:           genesisRoot[:],
+		DB:             beaconDB,
+		Genesis:        time.Now(),
+		ValidatorsRoot: [32]byte{},
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -438,6 +442,8 @@ func TestBlocksFetcher_findAncestor(t *testing.T) {
 			Epoch: finalizedEpoch,
 			Root:  []byte(fmt.Sprintf("finalized_root %d", finalizedEpoch)),
 		},
+		Genesis:        time.Now(),
+		ValidatorsRoot: [32]byte{},
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
diff --git a/beacon-chain/sync/initial-sync/blocks_queue_test.go b/beacon-chain/sync/initial-sync/blocks_queue_test.go
index 4ba30c4c85..03000bbf35 100644
--- a/beacon-chain/sync/initial-sync/blocks_queue_test.go
+++ b/beacon-chain/sync/initial-sync/blocks_queue_test.go
@@ -1052,6 +1052,8 @@ func TestBlocksQueue_stuckInUnfavourableFork(t *testing.T) {
 			Epoch: finalizedEpoch,
 			Root:  []byte(fmt.Sprintf("finalized_root %d", finalizedEpoch)),
 		},
+		Genesis:        time.Now(),
+		ValidatorsRoot: [32]byte{},
 	}
 
 	ctx, cancel := context.WithCancel(context.Background())
@@ -1251,6 +1253,8 @@ func TestBlocksQueue_stuckWhenHeadIsSetToOrphanedBlock(t *testing.T) {
 			Epoch: finalizedEpoch,
 			Root:  []byte(fmt.Sprintf("finalized_root %d", finalizedEpoch)),
 		},
+		Genesis:        time.Now(),
+		ValidatorsRoot: [32]byte{},
 	}
 
 	// Populate database with blocks with part of the chain, orphaned block will be added on top.
diff --git a/beacon-chain/sync/initial-sync/initial_sync_test.go b/beacon-chain/sync/initial-sync/initial_sync_test.go
index 64e6a1621e..e0e22a3901 100644
--- a/beacon-chain/sync/initial-sync/initial_sync_test.go
+++ b/beacon-chain/sync/initial-sync/initial_sync_test.go
@@ -96,6 +96,8 @@ func initializeTestServices(t *testing.T, slots []types.Slot, peers []*peerData)
 		FinalizedCheckPoint: &eth.Checkpoint{
 			Epoch: 0,
 		},
+		Genesis:        time.Now(),
+		ValidatorsRoot: [32]byte{},
 	}, p, beaconDB
 }
 
@@ -216,8 +218,9 @@ func connectPeer(t *testing.T, host *p2pt.TestP2P, datum *peerData, peerStatus *
 			ret = ret[:req.Count]
 		}
 
+		mChain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
 		for i := 0; i < len(ret); i++ {
-			assert.NoError(t, beaconsync.WriteChunk(stream, nil, p.Encoding(), ret[i]))
+			assert.NoError(t, beaconsync.WriteBlockChunk(stream, mChain, p.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(ret[i])))
 		}
 	})
 
@@ -286,7 +289,8 @@ func connectPeerHavingBlocks(
 			if uint64(i) >= uint64(len(blocks)) {
 				break
 			}
-			require.NoError(t, beaconsync.WriteChunk(stream, nil, p.Encoding(), blocks[i]))
+			chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+			require.NoError(t, beaconsync.WriteBlockChunk(stream, chain, p.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(blocks[i])))
 		}
 	})
 
diff --git a/beacon-chain/sync/initial-sync/round_robin_test.go b/beacon-chain/sync/initial-sync/round_robin_test.go
index 91a6c00dd8..c7e4f5961c 100644
--- a/beacon-chain/sync/initial-sync/round_robin_test.go
+++ b/beacon-chain/sync/initial-sync/round_robin_test.go
@@ -295,6 +295,8 @@ func TestService_roundRobinSync(t *testing.T) {
 				FinalizedCheckPoint: &eth.Checkpoint{
 					Epoch: 0,
 				},
+				Genesis:        time.Now(),
+				ValidatorsRoot: [32]byte{},
 			} // no-op mock
 			s := &Service{
 				ctx:          context.Background(),
@@ -338,6 +340,8 @@ func TestService_processBlock(t *testing.T) {
 			FinalizedCheckPoint: &eth.Checkpoint{
 				Epoch: 0,
 			},
+			Genesis:        time.Now(),
+			ValidatorsRoot: [32]byte{},
 		},
 		StateNotifier: &mock.MockStateNotifier{},
 	})
@@ -527,6 +531,8 @@ func TestService_blockProviderScoring(t *testing.T) {
 			Epoch: 0,
 			Root:  make([]byte, 32),
 		},
+		Genesis:        time.Now(),
+		ValidatorsRoot: [32]byte{},
 	} // no-op mock
 	s := &Service{
 		ctx:          context.Background(),
@@ -590,6 +596,8 @@ func TestService_syncToFinalizedEpoch(t *testing.T) {
 			Epoch: 0,
 			Root:  make([]byte, 32),
 		},
+		Genesis:        time.Now(),
+		ValidatorsRoot: [32]byte{},
 	}
 	s := &Service{
 		ctx:          context.Background(),
diff --git a/beacon-chain/sync/initial-sync/service_test.go b/beacon-chain/sync/initial-sync/service_test.go
index 8344b43ab2..dd90e30a08 100644
--- a/beacon-chain/sync/initial-sync/service_test.go
+++ b/beacon-chain/sync/initial-sync/service_test.go
@@ -58,6 +58,8 @@ func TestService_InitStartStop(t *testing.T) {
 					FinalizedCheckPoint: &eth.Checkpoint{
 						Epoch: 0,
 					},
+					Genesis:        time.Unix(4113849600, 0),
+					ValidatorsRoot: [32]byte{},
 				}
 			},
 			methodRuns: func(fd *event.Feed) {
@@ -86,6 +88,8 @@ func TestService_InitStartStop(t *testing.T) {
 					FinalizedCheckPoint: &eth.Checkpoint{
 						Epoch: 0,
 					},
+					Genesis:        time.Now().Add(-5 * time.Minute),
+					ValidatorsRoot: [32]byte{},
 				}
 			},
 			methodRuns: func(fd *event.Feed) {
@@ -117,6 +121,8 @@ func TestService_InitStartStop(t *testing.T) {
 					FinalizedCheckPoint: &eth.Checkpoint{
 						Epoch: helpers.SlotToEpoch(futureSlot),
 					},
+					Genesis:        makeGenesisTime(futureSlot),
+					ValidatorsRoot: [32]byte{},
 				}
 			},
 			methodRuns: func(fd *event.Feed) {
@@ -150,7 +156,7 @@ func TestService_InitStartStop(t *testing.T) {
 			defer hook.Reset()
 			ctx, cancel := context.WithCancel(context.Background())
 			defer cancel()
-			mc := &mock.ChainService{}
+			mc := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
 			// Allow overriding with customized chain service.
 			if tt.chainService != nil {
 				mc = tt.chainService()
@@ -211,7 +217,7 @@ func TestService_waitForStateInitialization(t *testing.T) {
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
 
-		s := newService(ctx, &mock.ChainService{})
+		s := newService(ctx, &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}})
 		wg := &sync.WaitGroup{}
 		wg.Add(1)
 		go func() {
@@ -238,7 +244,7 @@ func TestService_waitForStateInitialization(t *testing.T) {
 		defer hook.Reset()
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
-		s := newService(ctx, &mock.ChainService{})
+		s := newService(ctx, &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}})
 
 		expectedGenesisTime := time.Unix(358544700, 0)
 		var receivedGenesisTime time.Time
@@ -282,7 +288,7 @@ func TestService_waitForStateInitialization(t *testing.T) {
 		defer hook.Reset()
 		ctx, cancel := context.WithCancel(context.Background())
 		defer cancel()
-		s := newService(ctx, &mock.ChainService{})
+		s := newService(ctx, &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}})
 		// Initialize mock feed
 		_ = s.cfg.StateNotifier.StateFeed()
 
@@ -320,7 +326,7 @@ func TestService_waitForStateInitialization(t *testing.T) {
 }
 
 func TestService_markSynced(t *testing.T) {
-	mc := &mock.ChainService{}
+	mc := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	s := NewService(ctx, &Config{
@@ -403,6 +409,8 @@ func TestService_Resync(t *testing.T) {
 					FinalizedCheckPoint: &eth.Checkpoint{
 						Epoch: helpers.SlotToEpoch(futureSlot),
 					},
+					Genesis:        time.Now(),
+					ValidatorsRoot: [32]byte{},
 				}
 			},
 			assert: func(s *Service) {
diff --git a/beacon-chain/sync/rpc_beacon_blocks_by_range.go b/beacon-chain/sync/rpc_beacon_blocks_by_range.go
index fd9dbda6b1..05d5091573 100644
--- a/beacon-chain/sync/rpc_beacon_blocks_by_range.go
+++ b/beacon-chain/sync/rpc_beacon_blocks_by_range.go
@@ -162,7 +162,7 @@ func (s *Service) writeBlockRangeToStream(ctx context.Context, startSlot, endSlo
 		if b == nil || b.IsNil() || b.Block().IsNil() {
 			continue
 		}
-		if chunkErr := s.chunkWriter(stream, b.Proto()); chunkErr != nil {
+		if chunkErr := s.chunkBlockWriter(stream, b); chunkErr != nil {
 			log.WithError(chunkErr).Debug("Could not send a chunked response")
 			s.writeErrorResponseToStream(responseCodeServerError, p2ptypes.ErrGeneric.Error(), stream)
 			traceutil.AnnotateError(span, chunkErr)
diff --git a/beacon-chain/sync/rpc_beacon_blocks_by_range_test.go b/beacon-chain/sync/rpc_beacon_blocks_by_range_test.go
index 1693879d02..70869f1f92 100644
--- a/beacon-chain/sync/rpc_beacon_blocks_by_range_test.go
+++ b/beacon-chain/sync/rpc_beacon_blocks_by_range_test.go
@@ -22,7 +22,6 @@ import (
 	"github.com/prysmaticlabs/prysm/cmd/beacon-chain/flags"
 	ethpb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	pb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
-	statepb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
 	"github.com/prysmaticlabs/prysm/shared/bytesutil"
 	"github.com/prysmaticlabs/prysm/shared/params"
@@ -635,7 +634,7 @@ func TestRPCBeaconBlocksByRange_FilterBlocks(t *testing.T) {
 			require.NoError(t, d.SaveBlock(context.Background(), wrapper.WrappedPhase0SignedBeaconBlock(blocks[j])))
 			j++
 		}
-		stateSummaries := make([]*statepb.StateSummary, len(blocks))
+		stateSummaries := make([]*ethpb.StateSummary, len(blocks))
 
 		if finalized {
 			if chain.CanonicalRoots == nil {
@@ -644,7 +643,7 @@ func TestRPCBeaconBlocksByRange_FilterBlocks(t *testing.T) {
 			for i, b := range blocks {
 				bRoot, err := b.Block.HashTreeRoot()
 				require.NoError(t, err)
-				stateSummaries[i] = &statepb.StateSummary{
+				stateSummaries[i] = &ethpb.StateSummary{
 					Slot: b.Block.Slot,
 					Root: bRoot[:],
 				}
@@ -685,7 +684,7 @@ func TestRPCBeaconBlocksByRange_FilterBlocks(t *testing.T) {
 			require.NoError(t, d.SaveBlock(context.Background(), wrapper.WrappedPhase0SignedBeaconBlock(blocks[j])))
 			j++
 		}
-		stateSummaries := make([]*statepb.StateSummary, len(blocks))
+		stateSummaries := make([]*ethpb.StateSummary, len(blocks))
 		if finalized {
 			if chain.CanonicalRoots == nil {
 				chain.CanonicalRoots = map[[32]byte]bool{}
@@ -693,7 +692,7 @@ func TestRPCBeaconBlocksByRange_FilterBlocks(t *testing.T) {
 			for i, b := range blocks {
 				bRoot, err := b.Block.HashTreeRoot()
 				require.NoError(t, err)
-				stateSummaries[i] = &statepb.StateSummary{
+				stateSummaries[i] = &ethpb.StateSummary{
 					Slot: b.Block.Slot,
 					Root: bRoot[:],
 				}
diff --git a/beacon-chain/sync/rpc_beacon_blocks_by_root.go b/beacon-chain/sync/rpc_beacon_blocks_by_root.go
index ba4f9ccc94..73f91b8e6b 100644
--- a/beacon-chain/sync/rpc_beacon_blocks_by_root.go
+++ b/beacon-chain/sync/rpc_beacon_blocks_by_root.go
@@ -71,7 +71,7 @@ func (s *Service) beaconBlocksRootRPCHandler(ctx context.Context, msg interface{
 		if blk == nil || blk.IsNil() {
 			continue
 		}
-		if err := s.chunkWriter(stream, blk.Proto()); err != nil {
+		if err := s.chunkBlockWriter(stream, blk); err != nil {
 			return err
 		}
 	}
diff --git a/beacon-chain/sync/rpc_beacon_blocks_by_root_test.go b/beacon-chain/sync/rpc_beacon_blocks_by_root_test.go
index 9119dcf5e0..29e6dd768e 100644
--- a/beacon-chain/sync/rpc_beacon_blocks_by_root_test.go
+++ b/beacon-chain/sync/rpc_beacon_blocks_by_root_test.go
@@ -44,6 +44,7 @@ func TestRecentBeaconBlocksRPCHandler_ReturnsBlocks(t *testing.T) {
 	}
 
 	r := &Service{cfg: &Config{P2P: p1, DB: d}, rateLimiter: newRateLimiter(p1)}
+	r.cfg.Chain = &mock.ChainService{ValidatorsRoot: [32]byte{}}
 	pcl := protocol.ID(p2p.RPCBlocksByRootTopicV1)
 	topic := string(pcl)
 	r.rateLimiter.limiterMap[topic] = leakybucket.NewCollector(10000, 10000, false)
@@ -104,6 +105,8 @@ func TestRecentBeaconBlocks_RPCRequestSent(t *testing.T) {
 				State:               genesisState,
 				FinalizedCheckPoint: finalizedCheckpt,
 				Root:                blockARoot[:],
+				Genesis:             time.Now(),
+				ValidatorsRoot:      [32]byte{},
 			},
 		},
 		slotToPendingBlocks: gcache.New(time.Second, 2*time.Second),
diff --git a/beacon-chain/sync/rpc_chunked_response.go b/beacon-chain/sync/rpc_chunked_response.go
index d11ee1e787..6b5823fc51 100644
--- a/beacon-chain/sync/rpc_chunked_response.go
+++ b/beacon-chain/sync/rpc_chunked_response.go
@@ -1,35 +1,56 @@
 package sync
 
 import (
-	"errors"
-
 	libp2pcore "github.com/libp2p/go-libp2p-core"
+	"github.com/pkg/errors"
 	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p/encoder"
-	eth "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
+	"github.com/prysmaticlabs/prysm/beacon-chain/p2p/types"
 	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
-	"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/wrapper"
+	"github.com/prysmaticlabs/prysm/shared/bytesutil"
+	"github.com/prysmaticlabs/prysm/shared/p2putils"
+	"github.com/prysmaticlabs/prysm/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/version"
 )
 
-// chunkWriter writes the given message as a chunked response to the given network
+// chunkBlockWriter writes the given message as a chunked response to the given network
 // stream.
 // response_chunk  ::= <result> | <context-bytes> | <encoding-dependent-header> | <encoded-payload>
-func (s *Service) chunkWriter(stream libp2pcore.Stream, msg interface{}) error {
+func (s *Service) chunkBlockWriter(stream libp2pcore.Stream, blk block.SignedBeaconBlock) error {
 	SetStreamWriteDeadline(stream, defaultWriteDuration)
-	return WriteChunk(stream, s.cfg.Chain, s.cfg.P2P.Encoding(), msg)
+	return WriteBlockChunk(stream, s.cfg.Chain, s.cfg.P2P.Encoding(), blk)
 }
 
 // WriteChunk object to stream.
 // response_chunk  ::= <result> | <context-bytes> | <encoding-dependent-header> | <encoded-payload>
-func WriteChunk(stream libp2pcore.Stream, chain blockchain.ChainInfoFetcher, encoding encoder.NetworkEncoding, msg interface{}) error {
+func WriteBlockChunk(stream libp2pcore.Stream, chain blockchain.ChainInfoFetcher, encoding encoder.NetworkEncoding, blk block.SignedBeaconBlock) error {
 	if _, err := stream.Write([]byte{responseCodeSuccess}); err != nil {
 		return err
 	}
-	if err := writeContextToStream(stream, chain); err != nil {
+	obtainedCtx := []byte{}
+	switch blk.Version() {
+	case version.Phase0:
+		valRoot := chain.GenesisValidatorRoot()
+		digest, err := p2putils.ForkDigestFromEpoch(params.BeaconConfig().GenesisEpoch, valRoot[:])
+		if err != nil {
+			return err
+		}
+		obtainedCtx = digest[:]
+	case version.Altair:
+		valRoot := chain.GenesisValidatorRoot()
+		digest, err := p2putils.ForkDigestFromEpoch(params.BeaconConfig().AltairForkEpoch, valRoot[:])
+		if err != nil {
+			return err
+		}
+		obtainedCtx = digest[:]
+	}
+
+	if err := writeContextToStream(obtainedCtx, stream, chain); err != nil {
 		return err
 	}
-	_, err := encoding.EncodeWithMaxLength(stream, msg)
+	_, err := encoding.EncodeWithMaxLength(stream, blk)
 	return err
 }
 
@@ -40,17 +61,13 @@ func ReadChunkedBlock(stream libp2pcore.Stream, chain blockchain.ChainInfoFetche
 	if isFirstChunk {
 		return readFirstChunkedBlock(stream, chain, p2p)
 	}
-	blk := &eth.SignedBeaconBlock{}
-	if err := readResponseChunk(stream, chain, p2p, blk); err != nil {
-		return nil, err
-	}
-	return wrapper.WrappedPhase0SignedBeaconBlock(blk), nil
+
+	return readResponseChunk(stream, chain, p2p)
 }
 
 // readFirstChunkedBlock reads the first chunked block and applies the appropriate deadlines to
 // it.
 func readFirstChunkedBlock(stream libp2pcore.Stream, chain blockchain.ChainInfoFetcher, p2p p2p.P2P) (block.SignedBeaconBlock, error) {
-	blk := &eth.SignedBeaconBlock{}
 	code, errMsg, err := ReadStatusCode(stream, p2p.Encoding())
 	if err != nil {
 		return nil, err
@@ -58,30 +75,62 @@ func readFirstChunkedBlock(stream libp2pcore.Stream, chain blockchain.ChainInfoF
 	if code != 0 {
 		return nil, errors.New(errMsg)
 	}
-	// No-op for now with the rpc context.
-	_, err = readContextFromStream(stream, chain)
+	rpcCtx, err := readContextFromStream(stream, chain)
+	if err != nil {
+		return nil, err
+	}
+	blk, err := extractBlockDataType(rpcCtx, chain)
 	if err != nil {
 		return nil, err
 	}
 	err = p2p.Encoding().DecodeWithMaxLength(stream, blk)
-	return wrapper.WrappedPhase0SignedBeaconBlock(blk), err
+	return blk, err
 }
 
 // readResponseChunk reads the response from the stream and decodes it into the
 // provided message type.
-func readResponseChunk(stream libp2pcore.Stream, chain blockchain.ChainInfoFetcher, p2p p2p.P2P, to interface{}) error {
+func readResponseChunk(stream libp2pcore.Stream, chain blockchain.ChainInfoFetcher, p2p p2p.P2P) (block.SignedBeaconBlock, error) {
 	SetStreamReadDeadline(stream, respTimeout)
 	code, errMsg, err := readStatusCodeNoDeadline(stream, p2p.Encoding())
 	if err != nil {
-		return err
+		return nil, err
 	}
 	if code != 0 {
-		return errors.New(errMsg)
+		return nil, errors.New(errMsg)
 	}
 	// No-op for now with the rpc context.
-	_, err = readContextFromStream(stream, chain)
+	rpcCtx, err := readContextFromStream(stream, chain)
 	if err != nil {
-		return err
+		return nil, err
 	}
-	return p2p.Encoding().DecodeWithMaxLength(stream, to)
+	blk, err := extractBlockDataType(rpcCtx, chain)
+	if err != nil {
+		return nil, err
+	}
+	err = p2p.Encoding().DecodeWithMaxLength(stream, blk)
+	return blk, err
+}
+
+func extractBlockDataType(digest []byte, chain blockchain.ChainInfoFetcher) (block.SignedBeaconBlock, error) {
+	if len(digest) == 0 {
+		bFunc, ok := types.BlockMap[bytesutil.ToBytes4(params.BeaconConfig().GenesisForkVersion)]
+		if !ok {
+			return nil, errors.New("no block type exists for the genesis fork version.")
+		}
+		return bFunc()
+	}
+	if len(digest) != forkDigestLength {
+		return nil, errors.Errorf("invalid digest returned, wanted a length of %d but received %d", forkDigestLength, len(digest))
+	}
+	vRoot := chain.GenesisValidatorRoot()
+	for k, blkFunc := range types.BlockMap {
+		rDigest, err := helpers.ComputeForkDigest(k[:], vRoot[:])
+		if err != nil {
+			return nil, err
+		}
+		if rDigest == bytesutil.ToBytes4(digest) {
+			return blkFunc()
+		}
+	}
+	return nil, errors.New("no valid digest matched")
 }
diff --git a/beacon-chain/sync/rpc_chunked_response_test.go b/beacon-chain/sync/rpc_chunked_response_test.go
new file mode 100644
index 0000000000..cde28d4844
--- /dev/null
+++ b/beacon-chain/sync/rpc_chunked_response_test.go
@@ -0,0 +1,96 @@
+package sync
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
+	mock "github.com/prysmaticlabs/prysm/beacon-chain/blockchain/testing"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
+	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/shared/params"
+	"github.com/prysmaticlabs/prysm/shared/testutil/require"
+)
+
+func TestExtractBlockDataType(t *testing.T) {
+	// Precompute digests
+	genDigest, err := helpers.ComputeForkDigest(params.BeaconConfig().GenesisForkVersion, params.BeaconConfig().ZeroHash[:])
+	require.NoError(t, err)
+	altairDigest, err := helpers.ComputeForkDigest(params.BeaconConfig().AltairForkVersion, params.BeaconConfig().ZeroHash[:])
+	require.NoError(t, err)
+
+	type args struct {
+		digest []byte
+		chain  blockchain.ChainInfoFetcher
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    block.SignedBeaconBlock
+		wantErr bool
+	}{
+		{
+			name: "no digest",
+			args: args{
+				digest: []byte{},
+				chain:  &mock.ChainService{ValidatorsRoot: [32]byte{}},
+			},
+			want:    wrapper.WrappedPhase0SignedBeaconBlock(&ethpb.SignedBeaconBlock{}),
+			wantErr: false,
+		},
+		{
+			name: "invalid digest",
+			args: args{
+				digest: []byte{0x00, 0x01},
+				chain:  &mock.ChainService{ValidatorsRoot: [32]byte{}},
+			},
+			want:    nil,
+			wantErr: true,
+		},
+		{
+			name: "non existent digest",
+			args: args{
+				digest: []byte{0x00, 0x01, 0x02, 0x03},
+				chain:  &mock.ChainService{ValidatorsRoot: [32]byte{}},
+			},
+			want:    nil,
+			wantErr: true,
+		},
+		{
+			name: "genesis fork version",
+			args: args{
+				digest: genDigest[:],
+				chain:  &mock.ChainService{ValidatorsRoot: [32]byte{}},
+			},
+			want:    wrapper.WrappedPhase0SignedBeaconBlock(&ethpb.SignedBeaconBlock{}),
+			wantErr: false,
+		},
+		{
+			name: "altair fork version",
+			args: args{
+				digest: altairDigest[:],
+				chain:  &mock.ChainService{ValidatorsRoot: [32]byte{}},
+			},
+			want: func() block.SignedBeaconBlock {
+				wsb, err := wrapper.WrappedAltairSignedBeaconBlock(&ethpb.SignedBeaconBlockAltair{Block: &ethpb.BeaconBlockAltair{}})
+				require.NoError(t, err)
+				return wsb
+			}(),
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := extractBlockDataType(tt.args.digest, tt.args.chain)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("extractBlockDataType() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("extractBlockDataType() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
diff --git a/beacon-chain/sync/rpc_send_request.go b/beacon-chain/sync/rpc_send_request.go
index 9e54cea343..efe630840a 100644
--- a/beacon-chain/sync/rpc_send_request.go
+++ b/beacon-chain/sync/rpc_send_request.go
@@ -8,6 +8,7 @@ import (
 	"github.com/pkg/errors"
 	types "github.com/prysmaticlabs/eth2-types"
 	"github.com/prysmaticlabs/prysm/beacon-chain/blockchain"
+	"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	p2ptypes "github.com/prysmaticlabs/prysm/beacon-chain/p2p/types"
 	pb "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
@@ -27,7 +28,11 @@ func SendBeaconBlocksByRangeRequest(
 	ctx context.Context, chain blockchain.ChainInfoFetcher, p2pProvider p2p.P2P, pid peer.ID,
 	req *pb.BeaconBlocksByRangeRequest, blockProcessor BeaconBlockProcessor,
 ) ([]block.SignedBeaconBlock, error) {
-	stream, err := p2pProvider.Send(ctx, req, p2p.RPCBlocksByRangeTopicV1, pid)
+	topic, err := p2p.TopicFromMessage(p2p.BeaconBlocksByRangeMessageName, helpers.SlotToEpoch(chain.CurrentSlot()))
+	if err != nil {
+		return nil, err
+	}
+	stream, err := p2pProvider.Send(ctx, req, topic, pid)
 	if err != nil {
 		return nil, err
 	}
@@ -85,7 +90,11 @@ func SendBeaconBlocksByRootRequest(
 	ctx context.Context, chain blockchain.ChainInfoFetcher, p2pProvider p2p.P2P, pid peer.ID,
 	req *p2ptypes.BeaconBlockByRootsReq, blockProcessor BeaconBlockProcessor,
 ) ([]block.SignedBeaconBlock, error) {
-	stream, err := p2pProvider.Send(ctx, req, p2p.RPCBlocksByRootTopicV1, pid)
+	topic, err := p2p.TopicFromMessage(p2p.BeaconBlocksByRootsMessageName, helpers.SlotToEpoch(chain.CurrentSlot()))
+	if err != nil {
+		return nil, err
+	}
+	stream, err := p2pProvider.Send(ctx, req, topic, pid)
 	if err != nil {
 		return nil, err
 	}
diff --git a/beacon-chain/sync/rpc_send_request_test.go b/beacon-chain/sync/rpc_send_request_test.go
index 87e095294a..c0173eb736 100644
--- a/beacon-chain/sync/rpc_send_request_test.go
+++ b/beacon-chain/sync/rpc_send_request_test.go
@@ -6,10 +6,12 @@ import (
 	"fmt"
 	"io"
 	"testing"
+	"time"
 
 	"github.com/libp2p/go-libp2p-core/mux"
 	"github.com/libp2p/go-libp2p-core/network"
 	types "github.com/prysmaticlabs/eth2-types"
+	mock "github.com/prysmaticlabs/prysm/beacon-chain/blockchain/testing"
 	"github.com/prysmaticlabs/prysm/beacon-chain/p2p"
 	p2ptest "github.com/prysmaticlabs/prysm/beacon-chain/p2p/testing"
 	p2pTypes "github.com/prysmaticlabs/prysm/beacon-chain/p2p/types"
@@ -35,7 +37,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 		p1.Connect(bogusPeer)
 
 		req := &pb.BeaconBlocksByRangeRequest{}
-		_, err := SendBeaconBlocksByRangeRequest(ctx, nil, p1, bogusPeer.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		_, err := SendBeaconBlocksByRangeRequest(ctx, chain, p1, bogusPeer.PeerID(), req, nil)
 		assert.ErrorContains(t, "protocol not supported", err)
 	})
 
@@ -80,7 +83,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 				if uint64(i) >= uint64(len(knownBlocks)) {
 					break
 				}
-				err = WriteChunk(stream, nil, p2pProvider.Encoding(), knownBlocks[i])
+				chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+				err = WriteBlockChunk(stream, chain, p2pProvider.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(knownBlocks[i]))
 				if err != nil && err.Error() != mux.ErrReset.Error() {
 					require.NoError(t, err)
 				}
@@ -99,7 +103,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 			Count:     128,
 			Step:      1,
 		}
-		blocks, err := SendBeaconBlocksByRangeRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRangeRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.NoError(t, err)
 		assert.Equal(t, 128, len(blocks))
 	})
@@ -117,7 +122,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 			Step:      1,
 		}
 		blocksFromProcessor := make([]block.SignedBeaconBlock, 0)
-		blocks, err := SendBeaconBlocksByRangeRequest(ctx, nil, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRangeRequest(ctx, chain, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
 			blocksFromProcessor = append(blocksFromProcessor, block)
 			return nil
 		})
@@ -139,7 +145,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 			Step:      1,
 		}
 		errFromProcessor := errors.New("processor error")
-		_, err := SendBeaconBlocksByRangeRequest(ctx, nil, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		_, err := SendBeaconBlocksByRangeRequest(ctx, chain, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
 			return errFromProcessor
 		})
 		assert.ErrorContains(t, errFromProcessor.Error(), err)
@@ -157,7 +164,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 			Count:     128,
 			Step:      1,
 		}
-		blocks, err := SendBeaconBlocksByRangeRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRangeRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.NoError(t, err)
 		assert.Equal(t, 128, len(blocks))
 
@@ -168,7 +176,7 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 			cfg.MaxRequestBlocks = maxRequestBlocks
 			params.OverrideBeaconNetworkConfig(cfg)
 		}()
-		blocks, err = SendBeaconBlocksByRangeRequest(ctx, nil, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
+		blocks, err = SendBeaconBlocksByRangeRequest(ctx, chain, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
 			// Since ssz checks the boundaries, and doesn't normally allow to send requests bigger than
 			// the max request size, we are updating max request size dynamically. Even when updated dynamically,
 			// no more than max request size of blocks is expected on return.
@@ -199,7 +207,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 			Count:     128,
 			Step:      1,
 		}
-		blocks, err := SendBeaconBlocksByRangeRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRangeRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.ErrorContains(t, expectedErr.Error(), err)
 		assert.Equal(t, 0, len(blocks))
 	})
@@ -227,7 +236,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 				if uint64(i) >= uint64(len(knownBlocks)) {
 					break
 				}
-				err = WriteChunk(stream, nil, p2.Encoding(), knownBlocks[i])
+				chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+				err = WriteBlockChunk(stream, chain, p2.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(knownBlocks[i]))
 				if err != nil && err.Error() != mux.ErrReset.Error() {
 					require.NoError(t, err)
 				}
@@ -239,7 +249,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 			Count:     128,
 			Step:      1,
 		}
-		blocks, err := SendBeaconBlocksByRangeRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRangeRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.ErrorContains(t, ErrInvalidFetchedData.Error(), err)
 		assert.Equal(t, 0, len(blocks))
 
@@ -268,7 +279,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 				if uint64(i) >= uint64(len(knownBlocks)) {
 					break
 				}
-				err = WriteChunk(stream, nil, p2.Encoding(), knownBlocks[i])
+				chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+				err = WriteBlockChunk(stream, chain, p2.Encoding(), wrapper.WrappedPhase0SignedBeaconBlock(knownBlocks[i]))
 				if err != nil && err.Error() != mux.ErrReset.Error() {
 					require.NoError(t, err)
 				}
@@ -280,7 +292,8 @@ func TestSendRequest_SendBeaconBlocksByRangeRequest(t *testing.T) {
 			Count:     128,
 			Step:      10,
 		}
-		blocks, err := SendBeaconBlocksByRangeRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRangeRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.ErrorContains(t, ErrInvalidFetchedData.Error(), err)
 		assert.Equal(t, 0, len(blocks))
 
@@ -309,7 +322,8 @@ func TestSendRequest_SendBeaconBlocksByRootRequest(t *testing.T) {
 		p1.Connect(bogusPeer)
 
 		req := &p2pTypes.BeaconBlockByRootsReq{}
-		_, err := SendBeaconBlocksByRootRequest(ctx, nil, p1, bogusPeer.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		_, err := SendBeaconBlocksByRootRequest(ctx, chain, p1, bogusPeer.PeerID(), req, nil)
 		assert.ErrorContains(t, "protocol not supported", err)
 	})
 
@@ -356,7 +370,8 @@ func TestSendRequest_SendBeaconBlocksByRootRequest(t *testing.T) {
 		p2.SetStreamHandler(pcl, knownBlocksProvider(p2, nil))
 
 		req := &p2pTypes.BeaconBlockByRootsReq{knownRoots[0], knownRoots[1]}
-		blocks, err := SendBeaconBlocksByRootRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRootRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.NoError(t, err)
 		assert.Equal(t, 2, len(blocks))
 	})
@@ -370,7 +385,8 @@ func TestSendRequest_SendBeaconBlocksByRootRequest(t *testing.T) {
 		// No error from block processor.
 		req := &p2pTypes.BeaconBlockByRootsReq{knownRoots[0], knownRoots[1]}
 		blocksFromProcessor := make([]block.SignedBeaconBlock, 0)
-		blocks, err := SendBeaconBlocksByRootRequest(ctx, nil, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRootRequest(ctx, chain, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
 			blocksFromProcessor = append(blocksFromProcessor, block)
 			return nil
 		})
@@ -388,7 +404,8 @@ func TestSendRequest_SendBeaconBlocksByRootRequest(t *testing.T) {
 		// Send error from block processor.
 		req := &p2pTypes.BeaconBlockByRootsReq{knownRoots[0], knownRoots[1]}
 		errFromProcessor := errors.New("processor error")
-		_, err := SendBeaconBlocksByRootRequest(ctx, nil, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		_, err := SendBeaconBlocksByRootRequest(ctx, chain, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
 			return errFromProcessor
 		})
 		assert.ErrorContains(t, errFromProcessor.Error(), err)
@@ -402,7 +419,8 @@ func TestSendRequest_SendBeaconBlocksByRootRequest(t *testing.T) {
 
 		// No cap on max roots.
 		req := &p2pTypes.BeaconBlockByRootsReq{knownRoots[0], knownRoots[1], knownRoots[2], knownRoots[3]}
-		blocks, err := SendBeaconBlocksByRootRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRootRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.NoError(t, err)
 		assert.Equal(t, 4, len(blocks))
 
@@ -413,7 +431,7 @@ func TestSendRequest_SendBeaconBlocksByRootRequest(t *testing.T) {
 			cfg.MaxRequestBlocks = maxRequestBlocks
 			params.OverrideBeaconNetworkConfig(cfg)
 		}()
-		blocks, err = SendBeaconBlocksByRootRequest(ctx, nil, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
+		blocks, err = SendBeaconBlocksByRootRequest(ctx, chain, p1, p2.PeerID(), req, func(block block.SignedBeaconBlock) error {
 			// Since ssz checks the boundaries, and doesn't normally allow to send requests bigger than
 			// the max request size, we are updating max request size dynamically. Even when updated dynamically,
 			// no more than max request size of blocks is expected on return.
@@ -440,7 +458,8 @@ func TestSendRequest_SendBeaconBlocksByRootRequest(t *testing.T) {
 		}))
 
 		req := &p2pTypes.BeaconBlockByRootsReq{knownRoots[0], knownRoots[1], knownRoots[2], knownRoots[3]}
-		blocks, err := SendBeaconBlocksByRootRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRootRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.ErrorContains(t, expectedErr.Error(), err)
 		assert.Equal(t, 0, len(blocks))
 	})
@@ -460,7 +479,8 @@ func TestSendRequest_SendBeaconBlocksByRootRequest(t *testing.T) {
 		}))
 
 		req := &p2pTypes.BeaconBlockByRootsReq{knownRoots[0], knownRoots[1], knownRoots[2], knownRoots[3]}
-		blocks, err := SendBeaconBlocksByRootRequest(ctx, nil, p1, p2.PeerID(), req, nil)
+		chain := &mock.ChainService{Genesis: time.Now(), ValidatorsRoot: [32]byte{}}
+		blocks, err := SendBeaconBlocksByRootRequest(ctx, chain, p1, p2.PeerID(), req, nil)
 		assert.NoError(t, err)
 		assert.Equal(t, 3, len(blocks))
 	})