diff --git a/modules/sdk-core/src/bitgo/wallet/iWallet.ts b/modules/sdk-core/src/bitgo/wallet/iWallet.ts
index 4c523e1a2f..a5a176f5fe 100644
--- a/modules/sdk-core/src/bitgo/wallet/iWallet.ts
+++ b/modules/sdk-core/src/bitgo/wallet/iWallet.ts
@@ -771,6 +771,8 @@ export interface SendManyOptions extends PrebuildAndSignTransactionOptions {
   eip1559?: EIP1559;
   gasLimit?: number;
   custodianTransactionId?: string;
+  /** Optional blockchain identifier for specifying the target blockchain network */
+  blockChain?: string;
 }
 
 export interface FetchCrossChainUTXOsOptions {