From 122b45dde1d857c6ba034a71d9e821d09d973527 Mon Sep 17 00:00:00 2001
From: Derek Chen <derekchen550@bitgo.com>
Date: Mon, 10 Nov 2025 11:55:09 -0500
Subject: [PATCH] feat(statics): support message signing for bsc and polygon

Ticket: SC-3812
---
 modules/account-lib/src/index.ts    | 2 ++
 modules/sdk-coin-bsc/src/bsc.ts     | 5 +++++
 modules/statics/src/coinFeatures.ts | 1 +
 3 files changed, 8 insertions(+)

diff --git a/modules/account-lib/src/index.ts b/modules/account-lib/src/index.ts
index cc5f680cc1..b973e5bf13 100644
--- a/modules/account-lib/src/index.ts
+++ b/modules/account-lib/src/index.ts
@@ -337,6 +337,8 @@ const coinMessageBuilderFactoryMap = {
   topeth: Eth.MessageBuilderFactory,
   baseeth: Eth.MessageBuilderFactory,
   tbaseeth: Eth.MessageBuilderFactory,
+  polygon: Eth.MessageBuilderFactory,
+  tpolygon: Eth.MessageBuilderFactory,
 };
 
 coins
diff --git a/modules/sdk-coin-bsc/src/bsc.ts b/modules/sdk-coin-bsc/src/bsc.ts
index e43e4b23e0..18ce974fae 100644
--- a/modules/sdk-coin-bsc/src/bsc.ts
+++ b/modules/sdk-coin-bsc/src/bsc.ts
@@ -35,6 +35,11 @@ export class Bsc extends AbstractEthLikeNewCoins {
     return true;
   }
 
+  /** @inheritDoc */
+  supportsSigningTypedData(): boolean {
+    return true;
+  }
+
   /** inherited doc */
   getDefaultMultisigType(): MultisigType {
     return multisigTypes.tss;
diff --git a/modules/statics/src/coinFeatures.ts b/modules/statics/src/coinFeatures.ts
index f748d4da41..a6e3f5a08c 100644
--- a/modules/statics/src/coinFeatures.ts
+++ b/modules/statics/src/coinFeatures.ts
@@ -225,6 +225,7 @@ export const POLYGON_FEATURES = [
   CoinFeature.MPCV2,
   CoinFeature.STUCK_TRANSACTION_MANAGEMENT_TSS,
   CoinFeature.BULK_TRANSACTION,
+  CoinFeature.SHARED_EVM_MESSAGE_SIGNING,
   CoinFeature.ERC20_BULK_TRANSACTION,
 ];