diff --git a/beacon-chain/rpc/eth/beacon/handlers.go b/beacon-chain/rpc/eth/beacon/handlers.go
index 9649302544d..d7d0377aa82 100644
--- a/beacon-chain/rpc/eth/beacon/handlers.go
+++ b/beacon-chain/rpc/eth/beacon/handlers.go
@@ -1764,7 +1764,11 @@ func (s *Server) broadcastSeenBlockSidecars(
 	b interfaces.SignedBeaconBlock,
 	blobs [][]byte,
 	kzgProofs [][]byte) error {
-	scs, err := validator.BuildBlobSidecars(b, blobs, kzgProofs)
+	kzgCommitments, err := b.Block().Body().BlobKzgCommitments()
+	if err != nil {
+		return err
+	}
+	scs, err := validator.BuildBlobSidecars(b, blobs, kzgProofs, kzgCommitments, blocks.MerkleProofKZGCommitment)
 	if err != nil {
 		return err
 	}
diff --git a/beacon-chain/rpc/prysm/v1alpha1/validator/proposer.go b/beacon-chain/rpc/prysm/v1alpha1/validator/proposer.go
index 53e11be8e8f..406a93d3384 100644
--- a/beacon-chain/rpc/prysm/v1alpha1/validator/proposer.go
+++ b/beacon-chain/rpc/prysm/v1alpha1/validator/proposer.go
@@ -309,6 +309,12 @@ func (vs *Server) ProposeBeaconBlock(ctx context.Context, req *ethpb.GenericSign
 		block, sidecars, err = vs.handleBlindedBlock(ctx, block)
 	} else if block.Version() >= version.Deneb && block.Version() < version.EPBS {
 		sidecars, err = vs.blobSidecarsFromUnblindedBlock(block, req)
+	} else {
+		// TODO: Replace this with real merkle proof generation for epbs.
+		merkleProofEpbs := func(body interfaces.ReadOnlyBeaconBlockBody, index int) ([][]byte, error) {
+			return [][]byte{}, nil
+		}
+		sidecars, err = BuildBlobSidecars(block, vs.blobsBundle.Blobs, vs.blobsBundle.Proofs, vs.blobsBundle.Blobs, merkleProofEpbs)
 	}
 	if err != nil {
 		return nil, status.Errorf(codes.Internal, "%s: %v", "handle block failed", err)
@@ -380,7 +386,11 @@ func (vs *Server) blobSidecarsFromUnblindedBlock(block interfaces.SignedBeaconBl
 	if err != nil {
 		return nil, err
 	}
-	return BuildBlobSidecars(block, rawBlobs, proofs)
+	kzgCommitments, err := block.Block().Body().BlobKzgCommitments()
+	if err != nil {
+		return nil, err
+	}
+	return BuildBlobSidecars(block, rawBlobs, proofs, kzgCommitments, blocks.MerkleProofKZGCommitment)
 }
 
 // broadcastReceiveBlock broadcasts a block and handles its reception.
diff --git a/beacon-chain/rpc/prysm/v1alpha1/validator/proposer_deneb.go b/beacon-chain/rpc/prysm/v1alpha1/validator/proposer_deneb.go
index 2f57f409bd8..22f60478653 100644
--- a/beacon-chain/rpc/prysm/v1alpha1/validator/proposer_deneb.go
+++ b/beacon-chain/rpc/prysm/v1alpha1/validator/proposer_deneb.go
@@ -3,40 +3,40 @@ package validator
 import (
 	"errors"
 
-	"github.com/prysmaticlabs/prysm/v5/consensus-types/blocks"
 	"github.com/prysmaticlabs/prysm/v5/consensus-types/interfaces"
 	ethpb "github.com/prysmaticlabs/prysm/v5/proto/prysm/v1alpha1"
 	"github.com/prysmaticlabs/prysm/v5/runtime/version"
 )
 
 // BuildBlobSidecars given a block, builds the blob sidecars for the block.
-func BuildBlobSidecars(blk interfaces.SignedBeaconBlock, blobs [][]byte, kzgProofs [][]byte) ([]*ethpb.BlobSidecar, error) {
+func BuildBlobSidecars(
+	blk interfaces.SignedBeaconBlock,
+	blobs [][]byte,
+	kzgProofs [][]byte,
+	kzgCommitments [][]byte,
+	merkleProof func(body interfaces.ReadOnlyBeaconBlockBody, index int) ([][]byte, error)) ([]*ethpb.BlobSidecar, error) {
 	if blk.Version() < version.Deneb {
 		return nil, nil // No blobs before deneb.
 	}
-	commits, err := blk.Block().Body().BlobKzgCommitments()
-	if err != nil {
-		return nil, err
-	}
-	cLen := len(commits)
-	if cLen != len(blobs) || cLen != len(kzgProofs) {
+
+	if len(kzgCommitments) != len(blobs) || len(kzgCommitments) != len(kzgProofs) {
 		return nil, errors.New("blob KZG commitments don't match number of blobs or KZG proofs")
 	}
-	blobSidecars := make([]*ethpb.BlobSidecar, cLen)
+	blobSidecars := make([]*ethpb.BlobSidecar, len(kzgCommitments))
 	header, err := blk.Header()
 	if err != nil {
 		return nil, err
 	}
 	body := blk.Block().Body()
 	for i := range blobSidecars {
-		proof, err := blocks.MerkleProofKZGCommitment(body, i)
+		proof, err := merkleProof(body, i)
 		if err != nil {
 			return nil, err
 		}
 		blobSidecars[i] = &ethpb.BlobSidecar{
 			Index:                    uint64(i),
 			Blob:                     blobs[i],
-			KzgCommitment:            commits[i],
+			KzgCommitment:            kzgCommitments[i],
 			KzgProof:                 kzgProofs[i],
 			SignedBlockHeader:        header,
 			CommitmentInclusionProof: proof,
diff --git a/beacon-chain/rpc/prysm/v1alpha1/validator/proposer_deneb_test.go b/beacon-chain/rpc/prysm/v1alpha1/validator/proposer_deneb_test.go
index a9f83e7ab38..06bcdb799b6 100644
--- a/beacon-chain/rpc/prysm/v1alpha1/validator/proposer_deneb_test.go
+++ b/beacon-chain/rpc/prysm/v1alpha1/validator/proposer_deneb_test.go
@@ -22,7 +22,7 @@ func TestServer_buildBlobSidecars(t *testing.T) {
 		make([]byte, fieldparams.BlobLength), make([]byte, fieldparams.BlobLength),
 	}, [][]byte{
 		proof, proof,
-	})
+	}, kzgCommitments, blocks.MerkleProofKZGCommitment)
 	require.NoError(t, err)
 	require.Equal(t, 2, len(scs))