Make messages in makeSignBytes a list

this fixes a bug introduced in 2d14efa4cd

packages/bcp/src/cosmwasmcodec.ts

@@ -38,7 +38,7 @@ export class CosmWasmCodec implements TxCodec {
       sequence: nonceToSequence(nonce),
     };
     const signBytes = makeSignBytes(
-      built.value.msg[0],
+      built.value.msg,
       built.value.fee,
       Caip5.decode(unsigned.chainId),
       built.value.memo || "",

packages/sdk/src/encoding.ts

@@ -28,23 +28,33 @@ export function marshalTx(tx: StdTx): Uint8Array {
   return Encoding.toUtf8(json);
 }
 
+interface SignJson {
+  readonly account_number: string;
+  readonly chain_id: string;
+  readonly fee: StdFee;
+  readonly memo: string;
+  readonly msgs: readonly Msg[];
+  readonly sequence: string;
+}
+
 export function makeSignBytes(
-  msg: Msg,
+  msgs: readonly Msg[],
   fee: StdFee,
   chainId: string,
   memo: string,
   account: NonceInfo,
 ): Uint8Array {
-  const signMsg = sortJson({
+  const signJson: SignJson = {
     // eslint-disable-next-line @typescript-eslint/camelcase
     account_number: account.account_number.toString(),
     // eslint-disable-next-line @typescript-eslint/camelcase
     chain_id: chainId,
     fee: fee,
     memo: memo,
-    msgs: msg,
+    msgs: msgs,
     sequence: account.sequence.toString(),
-  });
+  };
+  const signMsg = sortJson(signJson);
   return toUtf8(JSON.stringify(signMsg));
 }
 

packages/sdk/src/restclient.spec.ts

@@ -152,7 +152,7 @@ describe("RestClient", () => {
 
       const client = new RestClient(httpUrl);
       const account = (await client.authAccounts(faucetAddress)).result.value;
-      const signBytes = makeSignBytes(theMsg, fee, defaultNetworkId, memo, account) as SignableBytes;
+      const signBytes = makeSignBytes([theMsg], fee, defaultNetworkId, memo, account) as SignableBytes;
       const rawSignature = await wallet.createTransactionSignature(signer, signBytes, PrehashType.Sha256);
       const signature = encodeSecp256k1Signature(signer.pubkey.data, rawSignature);
 

packages/sdk/types/encoding.d.ts

@@ -2,7 +2,7 @@ import { Msg, NonceInfo, StdFee, StdSignature, StdTx } from "./types";
 export declare function sortJson(json: any): any;
 export declare function marshalTx(tx: StdTx): Uint8Array;
 export declare function makeSignBytes(
-  msg: Msg,
+  msgs: readonly Msg[],
   fee: StdFee,
   chainId: string,
   memo: string,