diff --git a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/core/Transaction.java b/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/core/Transaction.java
index c7bc673ec1a..2fa94cc6bce 100644
--- a/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/core/Transaction.java
+++ b/ethereum/core/src/main/java/org/hyperledger/besu/ethereum/core/Transaction.java
@@ -112,7 +112,7 @@ public class Transaction
   // Caches the hash used to uniquely identify the transaction.
   protected volatile Hash hash;
   // Caches the size in bytes of the encoded transaction.
-  protected volatile int size = -1;
+  protected volatile Optional<Integer> networkSize = Optional.empty();
   private final TransactionType transactionType;
 
   private final SignatureAlgorithm signatureAlgorithm = SignatureAlgorithmFactory.getInstance();
@@ -688,20 +688,26 @@ public Hash getHash() {
    *
    * @return the size in bytes of the encoded transaction.
    */
-  public int getSize() {
-    if (size == -1) {
+  public Optional<Integer> getNetworkSize() {
+    if (networkSize.isEmpty()) {
       memoizeHashAndSize();
     }
-    return size;
+    return networkSize;
   }
 
   private void memoizeHashAndSize() {
     final Bytes bytes = TransactionEncoder.encodeOpaqueBytes(this);
     hash = Hash.hash(bytes);
 
-    final BytesValueRLPOutput rlpOutput = new BytesValueRLPOutput();
-    TransactionEncoder.encodeForWire(transactionType, bytes, rlpOutput);
-    size = rlpOutput.encodedSize();
+    if (transactionType.supportsBlob()) {
+      if (getBlobsWithCommitments().isPresent()) {
+        networkSize = Optional.of(TransactionEncoder.encodeOpaqueBytesForNetwork(this).size());
+      }
+    } else {
+      final BytesValueRLPOutput rlpOutput = new BytesValueRLPOutput();
+      TransactionEncoder.encodeForWire(transactionType, bytes, rlpOutput);
+      networkSize = Optional.of(rlpOutput.encodedSize());
+    }
   }
 
   /**
diff --git a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/TransactionRLPDecoderTest.java b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/TransactionRLPDecoderTest.java
index e8fbb7d6082..3ca8d3074ab 100644
--- a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/TransactionRLPDecoderTest.java
+++ b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/TransactionRLPDecoderTest.java
@@ -116,6 +116,7 @@ void shouldCalculateCorrectTransactionSize(final String rlp_tx, final String ign
     // Decode bytes into a transaction
     final Transaction transaction = TransactionDecoder.decodeForWire(RLP.input(bytes));
     // Bytes size should be equal to transaction size
-    assertThat(transaction.getSize()).isEqualTo(bytes.size());
+    assertThat(transaction.getNetworkSize().isPresent()).isTrue();
+    assertThat(transaction.getNetworkSize().get()).isEqualTo(bytes.size());
   }
 }
diff --git a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/TransactionSSZEncodingTest.java b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/TransactionSSZEncodingTest.java
index 9c6617cbdcf..05ec2089105 100644
--- a/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/TransactionSSZEncodingTest.java
+++ b/ethereum/core/src/test/java/org/hyperledger/besu/ethereum/core/encoding/TransactionSSZEncodingTest.java
@@ -20,6 +20,7 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 import org.hyperledger.besu.datatypes.Address;
+import org.hyperledger.besu.datatypes.Hash;
 import org.hyperledger.besu.ethereum.core.Transaction;
 
 import java.io.IOException;
@@ -103,7 +104,7 @@ private static String generateName(final Input input) {
   }
 
   private static String generateNameWithoutblobs(final InputWithoutBlobs input) {
-    return " chainId: " + input.getChainId();
+    return " hash: " + input.getHash();
   }
 
   @ParameterizedTest(name = "[{index}] {0}")
@@ -131,6 +132,7 @@ void shouldDecodeSSZTransactionsWithoutBlobs(
 
     assertThat(transaction).isNotNull();
     assertThat(transaction.getPayload()).isNotNull();
+    assertThat(transaction.getHash()).isEqualTo(Hash.fromHexString(input.getHash()));
     final Bytes encodedBytes = TransactionEncoder.encodeOpaqueBytes(transaction);
     assertThat(encodedBytes).isNotNull();
     assertThat(encodedBytes.toHexString()).isEqualTo(rawTransaction);
@@ -263,14 +265,14 @@ public void setData(final String data) {
   }
 
   public static class InputWithoutBlobs {
-    String chainId;
+    String hash;
 
-    public String getChainId() {
-      return chainId;
+    public String getHash() {
+      return hash;
     }
 
-    public void setChainId(final String chainId) {
-      this.chainId = chainId;
+    public void setHash(final String hash) {
+      this.hash = hash;
     }
   }
 }
diff --git a/ethereum/core/src/test/resources/org/hyperledger/besu/ethereum/core/encoding/blob_transactions_without_blobs_test_vectors.json b/ethereum/core/src/test/resources/org/hyperledger/besu/ethereum/core/encoding/blob_transactions_without_blobs_test_vectors.json
index 622a8266019..695bceb2396 100644
--- a/ethereum/core/src/test/resources/org/hyperledger/besu/ethereum/core/encoding/blob_transactions_without_blobs_test_vectors.json
+++ b/ethereum/core/src/test/resources/org/hyperledger/besu/ethereum/core/encoding/blob_transactions_without_blobs_test_vectors.json
@@ -1,7 +1,7 @@
 [
   {
     "Input": {
-      "chainId": "4844001004"
+      "hash": "0x31b315056d41d2e05b3a9d6b8beb4dadcffd286a62ca37dd7de0c89debe2633e"
     },
     "RawEncodedTransaction": "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"
   }
diff --git a/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/encoding/TransactionAnnouncementEncoder.java b/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/encoding/TransactionAnnouncementEncoder.java
index 81df7489daf..06ac6c53e55 100644
--- a/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/encoding/TransactionAnnouncementEncoder.java
+++ b/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/encoding/TransactionAnnouncementEncoder.java
@@ -81,7 +81,7 @@ private static Bytes encodeForEth68(final List<Transaction> transactions) {
     transactions.forEach(
         transaction -> {
           types.add(transaction.getType());
-          sizes.add(transaction.getSize());
+          sizes.add(transaction.getNetworkSize().orElseThrow());
           hashes.add(transaction.getHash());
         });
 
diff --git a/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/TransactionAnnouncement.java b/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/TransactionAnnouncement.java
index 1533a6bdbe4..13ae527b650 100644
--- a/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/TransactionAnnouncement.java
+++ b/ethereum/eth/src/main/java/org/hyperledger/besu/ethereum/eth/transactions/TransactionAnnouncement.java
@@ -40,7 +40,7 @@ public TransactionAnnouncement(final Transaction transaction) {
     this(
         checkNotNull(transaction, "Transaction cannot be null").getHash(),
         transaction.getType(),
-        (long) transaction.getSize());
+        (long) transaction.getNetworkSize().orElseThrow());
   }
 
   public TransactionAnnouncement(final Hash hash, final TransactionType type, final Long size) {
diff --git a/ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/transactions/NewPooledTransactionHashesMessageProcessorTest.java b/ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/transactions/NewPooledTransactionHashesMessageProcessorTest.java
index 7640ab87479..6e005b481ff 100644
--- a/ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/transactions/NewPooledTransactionHashesMessageProcessorTest.java
+++ b/ethereum/eth/src/test/java/org/hyperledger/besu/ethereum/eth/transactions/NewPooledTransactionHashesMessageProcessorTest.java
@@ -366,7 +366,8 @@ public void shouldEncodeAndDecodeTransactionAnnouncement_Eth68() {
       final TransactionAnnouncement announcement = announcementList.get(list.indexOf(transaction));
       assertThat(announcement.getHash()).isEqualTo(transaction.getHash());
       assertThat(announcement.getType()).hasValue(transaction.getType());
-      assertThat(announcement.getSize()).hasValue((long) transaction.getSize());
+      assertThat(announcement.getSize())
+          .hasValue((long) transaction.getNetworkSize().orElseThrow());
     }
   }