Fix GetBlobBundleV1 response (#5075)

Signed-off-by: Fabio Di Fabio <fabio.difabio@consensys.net>

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/methods/engine/EngineGetBlobsBundleV1.java

@@ -63,20 +63,23 @@ public class EngineGetBlobsBundleV1 extends AbstractEngineGetPayload {
 
   private BlobsBundleV1 createResponse(final Block block) {
 
-    List<Bytes> kzgs =
+    final List<Transaction.BlobsWithCommitments> blobsWithCommitments =
         block.getBody().getTransactions().stream()
             .map(Transaction::getBlobsWithCommitments)
             .filter(Optional::isPresent)
             .map(Optional::get)
+            .collect(Collectors.toList());
+
+    final List<String> kzgs =
+        blobsWithCommitments.stream()
             .flatMap(b -> b.getKzgCommitments().stream())
+            .map(Bytes::toString)
             .collect(Collectors.toList());
 
-    List<Bytes> blobs =
-        block.getBody().getTransactions().stream()
-            .map(Transaction::getBlobsWithCommitments)
-            .filter(Optional::isPresent)
-            .map(Optional::get)
+    final List<String> blobs =
+        blobsWithCommitments.stream()
             .flatMap(b -> b.getBlobs().stream())
+            .map(Bytes::toString)
             .collect(Collectors.toList());
 
     return new BlobsBundleV1(block.getHash(), kzgs, blobs);

ethereum/api/src/main/java/org/hyperledger/besu/ethereum/api/jsonrpc/internal/results/BlobsBundleV1.java

@@ -21,18 +21,17 @@ import java.util.List;
 
 import com.fasterxml.jackson.annotation.JsonGetter;
 import com.fasterxml.jackson.annotation.JsonPropertyOrder;
-import org.apache.tuweni.bytes.Bytes;
 
 @JsonPropertyOrder({"blockHash", "kzgs", "blobs"})
 public class BlobsBundleV1 {
 
   private final String blockHash;
 
-  private final List<Bytes> kzgs;
+  private final List<String> kzgs;
 
-  private final List<Bytes> blobs;
+  private final List<String> blobs;
 
-  public BlobsBundleV1(final Hash blockHash, final List<Bytes> kzgs, final List<Bytes> blobs) {
+  public BlobsBundleV1(final Hash blockHash, final List<String> kzgs, final List<String> blobs) {
     this.blockHash = blockHash.toString();
     this.kzgs = kzgs;
     this.blobs = blobs;
@@ -44,12 +43,12 @@ public class BlobsBundleV1 {
   }
 
   @JsonGetter("kzgs")
-  public List<Bytes> getKzgs() {
+  public List<String> getKzgs() {
     return kzgs;
   }
 
   @JsonGetter("blobs")
-  public List<Bytes> getBlobs() {
+  public List<String> getBlobs() {
     return blobs;
   }
 }