diff --git a/beacon/engine/types.go b/beacon/engine/types.go
index 827cc41575..416c02f7b7 100644
--- a/beacon/engine/types.go
+++ b/beacon/engine/types.go
@@ -158,8 +158,8 @@ type BlobAndProofV2 struct {
 }
 
 type BlobCellsAndProofsV1 struct {
-	BlobCells []hexutil.Bytes `json:"blob_cells"`
-	Proofs    []hexutil.Bytes `json:"proofs"`
+	BlobCells []*hexutil.Bytes `json:"blob_cells"`
+	Proofs    []*hexutil.Bytes `json:"proofs"`
 }
 
 // JSON type overrides for ExecutionPayloadEnvelope.
diff --git a/eth/catalyst/api.go b/eth/catalyst/api.go
index b56a800e8a..1e517e39b1 100644
--- a/eth/catalyst/api.go
+++ b/eth/catalyst/api.go
@@ -709,16 +709,18 @@ func (api *ConsensusAPI) GetBlobsV4(hashes []common.Hash, indicesBitarray types.
 			continue
 		}
 		hitCount++
-		blobCells := make([]hexutil.Bytes, len(cells[i]))
+		blobCells := make([]*hexutil.Bytes, len(cells[i]))
 		for j, cell := range cells[i] {
 			if cell != nil {
-				blobCells[j] = cell[:]
+				b := hexutil.Bytes(cell[:])
+				blobCells[j] = &b
 			}
 		}
-		blobProofs := make([]hexutil.Bytes, len(proofs[i]))
+		blobProofs := make([]*hexutil.Bytes, len(proofs[i]))
 		for j, proof := range proofs[i] {
 			if proof != nil {
-				blobProofs[j] = proof[:]
+				b := hexutil.Bytes(proof[:])
+				blobProofs[j] = &b
 			}
 		}
 		res[i] = &engine.BlobCellsAndProofsV1{