From c89ea9b1183591b8a9f95f7f52d9e69d95d28649 Mon Sep 17 00:00:00 2001
From: Support Bot <tines@bitgo.com>
Date: Thu, 27 Aug 2026 06:56:58 +0000
Subject: [PATCH] fix(abstract-eth): preserve version zero for CCR signing

Pass wallet version zero from CCR build responses into the transaction builder.
This allows self-serve signing for legacy version zero wallets, whose
recovery requests currently lose the version because zero is falsy.

Ticket: SPT-270
Session-Id: e7756c81-cf6f-4700-8037-6aa3f1482e1b
Task-Id: d02d4750-f978-47bb-8037-8ba604d7ef62
---
 modules/abstract-eth/src/abstractEthLikeNewCoins.ts | 2 +-
 modules/sdk-coin-ethlike/test/unit/ethlikeCoin.ts   | 5 ++++-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/modules/abstract-eth/src/abstractEthLikeNewCoins.ts b/modules/abstract-eth/src/abstractEthLikeNewCoins.ts
index 16223616db..49aca4fc8f 100644
--- a/modules/abstract-eth/src/abstractEthLikeNewCoins.ts
+++ b/modules/abstract-eth/src/abstractEthLikeNewCoins.ts
@@ -1706,7 +1706,7 @@ export abstract class AbstractEthLikeNewCoins extends AbstractEthLikeCoin implem
     const txBuilder = this.getTransactionBuilder(params.common) as TransactionBuilder;
     const txHex = buildResponse.txHex;
     txBuilder.from(txHex);
-    if (buildResponse.walletVersion) {
+    if (buildResponse.walletVersion !== undefined) {
       // If walletVersion is provided, set it in the txBuilder
       txBuilder.walletVersion(buildResponse.walletVersion);
     }
diff --git a/modules/sdk-coin-ethlike/test/unit/ethlikeCoin.ts b/modules/sdk-coin-ethlike/test/unit/ethlikeCoin.ts
index 6567a2c895..45c9be86c0 100644
--- a/modules/sdk-coin-ethlike/test/unit/ethlikeCoin.ts
+++ b/modules/sdk-coin-ethlike/test/unit/ethlikeCoin.ts
@@ -60,6 +60,7 @@ describe('EthLike coin tests', function () {
         const recoveryId = '0x1234567890abcdef';
         nock(bitgo.microservicesUrl(`/api/recovery/v1/crosschain`)).get(`/${recoveryId}/buildtx`).reply(200, {
           txHex: mockData.ccr[coin.name].txHex,
+          walletVersion: 0,
         });
         const walletPassphrase = TestBitGo.V2.TEST_RECOVERY_PASSCODE as string;
         const params = {
@@ -75,6 +76,7 @@ describe('EthLike coin tests', function () {
         const recoveryId = '0x1234567890abcdef';
         nock(bitgo.microservicesUrl(`/api/recovery/v1/crosschain`)).get(`/${recoveryId}/buildtx`).reply(200, {
           txHex: mockData.ccr[coin.name].txHex,
+          walletVersion: 0,
         });
         nock(bitgo.microservicesUrl(`/api/recovery/v1/crosschain`)).post(`/${recoveryId}/sign`).reply(200, {
           coin: coin.name,
@@ -96,6 +98,7 @@ describe('EthLike coin tests', function () {
         const recoveryId = '0x1234567890abcdef';
         nock(bitgo.microservicesUrl(`/api/recovery/v1/crosschain`)).get(`/${recoveryId}/buildtx`).reply(200, {
           txHex: mockData.ccr[coin.name].txHex,
+          walletVersion: 0,
         });
         const params = {
           recoveryId,
@@ -112,7 +115,7 @@ describe('EthLike coin tests', function () {
           coin: coin.name,
           txHex: mockData.ccr[coin.name].txHex,
           txid: mockData.ccr[coin.name].txid,
-          walletVersion: 1,
+          walletVersion: 0,
         };
 
         nock(bitgo.microservicesUrl(`/api/recovery/v1/crosschain`))