From a5cd30b90f860626a419d8a943b192720ced23ef Mon Sep 17 00:00:00 2001
From: Kamlesh Mugdiya <kamleshmugdiya@bitgo.com>
Date: Sat, 22 Nov 2025 13:32:03 +0530
Subject: [PATCH] fix(sdk-coin-vet): preserve precision for large value
 transactions

Ticket: COIN-0000
---
 .../src/lib/transaction/transaction.ts        |  2 +-
 .../transactionBuilder/transferBuilder.ts     | 38 +++++++++++++++++++
 2 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/modules/sdk-coin-vet/src/lib/transaction/transaction.ts b/modules/sdk-coin-vet/src/lib/transaction/transaction.ts
index b9a3cc355e..962438ca85 100644
--- a/modules/sdk-coin-vet/src/lib/transaction/transaction.ts
+++ b/modules/sdk-coin-vet/src/lib/transaction/transaction.ts
@@ -292,7 +292,7 @@ export class Transaction extends BaseTransaction {
       // Set recipients from clauses
       this.recipients = body.clauses.map((clause) => ({
         address: (clause.to || '0x0').toString().toLowerCase(),
-        amount: Number(clause.value).toString(),
+        amount: new BigNumber(clause.value).toFixed(),
       }));
       this.loadInputsAndOutputs();
 
diff --git a/modules/sdk-coin-vet/test/transactionBuilder/transferBuilder.ts b/modules/sdk-coin-vet/test/transactionBuilder/transferBuilder.ts
index be906570be..dee4f65af6 100644
--- a/modules/sdk-coin-vet/test/transactionBuilder/transferBuilder.ts
+++ b/modules/sdk-coin-vet/test/transactionBuilder/transferBuilder.ts
@@ -166,6 +166,44 @@ describe('Vet Transfer Transaction', () => {
         should.equal(completelySignedTx.toBroadcastFormat(), testData.completeSignedSerializedHex);
         should.equal(completelySignedTx.id, '0xb988d614d3c24420cb2183239ab601b53e63ff4c81cea1e4888bc9d0aa6aad13');
       });
+
+      it('should preserve full precision of large number values', async function () {
+        // A very large number that would normally be represented in scientific notation '2.332734928448876e+22
+        const largeAmount = '23327349284488761096413';
+
+        const transaction = new Transaction(coins.get('tvet'));
+        const txBuilder = factory.getTransferBuilder(transaction);
+
+        // Use the large amount in recipients
+        const recipients = [
+          {
+            address: testData.addresses.validAddresses[1].toLowerCase(),
+            amount: largeAmount,
+          },
+        ];
+
+        txBuilder.sender(testData.addresses.validAddresses[0]);
+        txBuilder.recipients(recipients);
+        txBuilder.gas(21000);
+        txBuilder.nonce('64248');
+        txBuilder.blockRef('0x014ead140e77bbc1');
+        txBuilder.addFeePayerAddress(testData.feePayer.address);
+        txBuilder.expiration(64);
+        txBuilder.gasPriceCoef(128);
+
+        const tx = (await txBuilder.build()) as Transaction;
+
+        // Verify that the value is preserved exactly as provided
+        should.equal(tx.outputs[0].value, largeAmount);
+
+        // Create a serialized transaction and parse it back
+        const serializedTx = tx.toBroadcastFormat();
+        const deserializedTxBuilder = factory.from(serializedTx);
+        const deserializedTx = await deserializedTxBuilder.build();
+
+        // Verify the value is still preserved after serialization/deserialization
+        should.equal(deserializedTx.outputs[0].value, largeAmount);
+      });
     });
 
     describe('Fail', () => {