diff --git a/src/transformer.spec.ts b/src/transformer.spec.ts
index a9b4c7e..7df49e0 100644
--- a/src/transformer.spec.ts
+++ b/src/transformer.spec.ts
@@ -53,7 +53,6 @@ describe('transformations', () => {
       ]);
       // timestamp
       expect(tx.timestamp).toBe(1689269015);
-      expect(tx.isoTimestamp).toBe(new Date(1689269015 * 1000).toISOString());
       // fees
       expect(tx.baseFeePerGas).toBe(49897163985);
       expect(tx.transactionFee).toBe('1103276192872335');
diff --git a/src/transformers/_common/timestamp.spec.ts b/src/transformers/_common/timestamp.spec.ts
index 91d992d..7b8917e 100644
--- a/src/transformers/_common/timestamp.spec.ts
+++ b/src/transformers/_common/timestamp.spec.ts
@@ -8,9 +8,6 @@ describe('transactionTimestamp', () => {
 
     for (let i = 0; i < block.transactions.length; i += 1) {
       expect(result.transactions[i].timestamp).toBe(block.timestamp);
-      expect(result.transactions[i].isoTimestamp).toBe(
-        new Date(block.timestamp * 1000).toISOString(),
-      );
     }
   });
 });
diff --git a/src/transformers/_common/timestamp.ts b/src/transformers/_common/timestamp.ts
index 5292120..a445613 100644
--- a/src/transformers/_common/timestamp.ts
+++ b/src/transformers/_common/timestamp.ts
@@ -1,11 +1,8 @@
 import type { RawBlock } from '../../types';
 
 export function transform(block: RawBlock): RawBlock {
-  const isoTimestamp = new Date(block.timestamp * 1000).toISOString();
-
   block.transactions = block.transactions.map((tx) => {
     tx.timestamp = block.timestamp;
-    tx.isoTimestamp = isoTimestamp;
     return tx;
   });