diff --git a/yarn-project/circuit-types/src/tx/tx_hash.ts b/yarn-project/circuit-types/src/tx/tx_hash.ts
index 514097b3d6bc..c92340c1928b 100644
--- a/yarn-project/circuit-types/src/tx/tx_hash.ts
+++ b/yarn-project/circuit-types/src/tx/tx_hash.ts
@@ -1,3 +1,4 @@
+import { randomBytes } from '@aztec/foundation/crypto';
 import { BufferReader, deserializeBigInt, serializeBigInt } from '@aztec/foundation/serialize';
 
 /**
@@ -105,4 +106,12 @@ export class TxHash {
   public static fromString(str: string): TxHash {
     return new TxHash(Buffer.from(str, 'hex'));
   }
+
+  /**
+   * Generates a random TxHash.
+   * @returns A new TxHash object.
+   */
+  public static random(): TxHash {
+    return new TxHash(Buffer.from(randomBytes(TxHash.SIZE)));
+  }
 }
diff --git a/yarn-project/circuit-types/src/tx/tx_receipt.test.ts b/yarn-project/circuit-types/src/tx/tx_receipt.test.ts
new file mode 100644
index 000000000000..2eac60ece2e4
--- /dev/null
+++ b/yarn-project/circuit-types/src/tx/tx_receipt.test.ts
@@ -0,0 +1,23 @@
+import { TxHash } from './tx_hash.js';
+import { TxReceipt, TxStatus } from './tx_receipt.js';
+
+describe('TxReceipt', () => {
+  it('serializes and deserializes from json', () => {
+    const receipt = new TxReceipt(
+      TxHash.random(),
+      TxStatus.SUCCESS,
+      'error',
+      BigInt(1),
+      Buffer.from('blockHash'),
+      undefined,
+    );
+
+    expect(TxReceipt.fromJSON(receipt.toJSON())).toEqual(receipt);
+  });
+
+  it('serializes and deserializes from json with undefined fields', () => {
+    const receipt = new TxReceipt(TxHash.random(), TxStatus.DROPPED, 'error', undefined, undefined, undefined);
+
+    expect(TxReceipt.fromJSON(receipt.toJSON())).toEqual(receipt);
+  });
+});
diff --git a/yarn-project/circuit-types/src/tx/tx_receipt.ts b/yarn-project/circuit-types/src/tx/tx_receipt.ts
index 39c9f29f540f..fc32f1b077f7 100644
--- a/yarn-project/circuit-types/src/tx/tx_receipt.ts
+++ b/yarn-project/circuit-types/src/tx/tx_receipt.ts
@@ -66,6 +66,7 @@ export class TxReceipt {
       error: this.error,
       blockHash: this.blockHash?.toString('hex'),
       blockNumber: this.blockNumber,
+      transactionFee: this.transactionFee?.toString(),
     };
   }
 
@@ -78,7 +79,7 @@ export class TxReceipt {
     const txHash = TxHash.fromString(obj.txHash);
     const status = obj.status as TxStatus;
     const error = obj.error;
-    const transactionFee = obj.transactionFee;
+    const transactionFee = obj.transactionFee ? BigInt(obj.transactionFee) : undefined;
     const blockHash = obj.blockHash ? Buffer.from(obj.blockHash, 'hex') : undefined;
     const blockNumber = obj.blockNumber ? Number(obj.blockNumber) : undefined;
     return new TxReceipt(txHash, status, error, transactionFee, blockHash, blockNumber);