diff --git a/CHANGELOG.md b/CHANGELOG.md
index 39c01ae8..e9b9f68e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -58,6 +58,7 @@
 - @cosmjs/launchpad: Create `WrappedTx`, `WrappedStdTx` and `isWrappedStdTx` to
   better represent the Amino tx interface. Deprecate `CosmosSdkTx`, which is an
   alias for `WrappedStdTx`.
+- @cosmjs/launchpad: Add `makeStdTx` to create an `StdTx`.
 - @cosmjs/launchpad-ledger: Add package supporting Ledger device integration for
   Launchpad. Two new classes are provided: `LedgerSigner` (for most use cases)
   and `LaunchpadLedger` for more fine-grained access.
diff --git a/packages/cli/README.md b/packages/cli/README.md
index 8c5fbdfb..47818805 100644
--- a/packages/cli/README.md
+++ b/packages/cli/README.md
@@ -74,13 +74,8 @@ const signDoc = makeSignDoc(
   account_number,
   sequence,
 );
-const { signature } = await wallet.sign(faucetAddress, signDoc);
-const signedTx: StdTx = {
-  msg: [sendTokensMsg],
-  fee: defaultFee,
-  memo: memo,
-  signatures: [signature],
-};
+const { signed, signature } = await wallet.sign(faucetAddress, signDoc);
+const signedTx = makeStdTx(signed, signature);
 const broadcastResult = await client.broadcastTx(signedTx);
 ```
 
diff --git a/packages/cli/examples/delegate.ts b/packages/cli/examples/delegate.ts
index 199ed2b6..edcdfcfb 100644
--- a/packages/cli/examples/delegate.ts
+++ b/packages/cli/examples/delegate.ts
@@ -28,13 +28,8 @@ const { accountNumber, sequence } = await client.getSequence(senderAddress);
 console.log("Account/sequence:", accountNumber, sequence);
 
 const signDoc = makeSignDoc([msg], fee, chainId, memo, accountNumber, sequence);
-const { signature } = await wallet.sign(senderAddress, signDoc);
-const signedTx: StdTx = {
-  msg: [msg],
-  fee: fee,
-  memo: memo,
-  signatures: [signature],
-};
+const { signed, signature } = await wallet.sign(senderAddress, signDoc);
+const signedTx = makeStdTx(signed, signature);
 
 const result = await client.broadcastTx(signedTx);
 console.log("Broadcast result:", result);
diff --git a/packages/cli/src/cli.ts b/packages/cli/src/cli.ts
index 32b0ac14..cc3ad5e9 100644
--- a/packages/cli/src/cli.ts
+++ b/packages/cli/src/cli.ts
@@ -99,6 +99,7 @@ export async function main(originalArgs: readonly string[]): Promise<void> {
         "logs",
         "makeCosmoshubPath",
         "makeSignDoc",
+        "makeStdTx",
         "IndexedTx",
         "BroadcastTxResult",
         "Coin",
diff --git a/packages/cosmwasm/src/cosmwasmclient.searchtx.spec.ts b/packages/cosmwasm/src/cosmwasmclient.searchtx.spec.ts
index db6af67a..9c386d77 100644
--- a/packages/cosmwasm/src/cosmwasmclient.searchtx.spec.ts
+++ b/packages/cosmwasm/src/cosmwasmclient.searchtx.spec.ts
@@ -6,6 +6,7 @@ import {
   isMsgSend,
   LcdClient,
   makeSignDoc,
+  makeStdTx,
   MsgSend,
   Secp256k1Wallet,
   WrappedStdTx,
@@ -104,15 +105,10 @@ describe("CosmWasmClient.searchTx", () => {
         const { accountNumber, sequence } = await client.getSequence();
         const chainId = await client.getChainId();
         const signDoc = makeSignDoc([sendMsg], fee, chainId, memo, accountNumber, sequence);
-        const { signature } = await wallet.sign(alice.address0, signDoc);
+        const { signed, signature } = await wallet.sign(alice.address0, signDoc);
         const tx: WrappedStdTx = {
           type: "cosmos-sdk/StdTx",
-          value: {
-            msg: [sendMsg],
-            fee: fee,
-            memo: memo,
-            signatures: [signature],
-          },
+          value: makeStdTx(signed, signature),
         };
         const transactionId = await client.getIdentifier(tx);
         const result = await client.broadcastTx(tx.value);
diff --git a/packages/cosmwasm/src/cosmwasmclient.spec.ts b/packages/cosmwasm/src/cosmwasmclient.spec.ts
index ec0f895b..1e1143d1 100644
--- a/packages/cosmwasm/src/cosmwasmclient.spec.ts
+++ b/packages/cosmwasm/src/cosmwasmclient.spec.ts
@@ -5,10 +5,10 @@ import {
   assertIsBroadcastTxSuccess,
   isWrappedStdTx,
   makeSignDoc,
+  makeStdTx,
   MsgSend,
   Secp256k1Wallet,
   StdFee,
-  StdTx,
 } from "@cosmjs/launchpad";
 import { assert, sleep } from "@cosmjs/utils";
 import { ReadonlyDate } from "readonly-date";
@@ -240,13 +240,8 @@ describe("CosmWasmClient", () => {
       const chainId = await client.getChainId();
       const { accountNumber, sequence } = await client.getSequence(alice.address0);
       const signDoc = makeSignDoc([sendMsg], fee, chainId, memo, accountNumber, sequence);
-      const { signature } = await wallet.sign(alice.address0, signDoc);
-      const signedTx: StdTx = {
-        msg: [sendMsg],
-        fee: fee,
-        memo: memo,
-        signatures: [signature],
-      };
+      const { signed, signature } = await wallet.sign(alice.address0, signDoc);
+      const signedTx = makeStdTx(signed, signature);
       const result = await client.broadcastTx(signedTx);
       assertIsBroadcastTxSuccess(result);
       const { logs, transactionHash } = result;
diff --git a/packages/cosmwasm/src/lcdapi/wasm.spec.ts b/packages/cosmwasm/src/lcdapi/wasm.spec.ts
index 199d915a..459ecdf7 100644
--- a/packages/cosmwasm/src/lcdapi/wasm.spec.ts
+++ b/packages/cosmwasm/src/lcdapi/wasm.spec.ts
@@ -11,6 +11,7 @@ import {
   coins,
   LcdClient,
   makeSignDoc,
+  makeStdTx,
   OfflineSigner,
   Secp256k1Wallet,
   setupAuthExtension,
@@ -36,7 +37,6 @@ import {
   fromOneElementArray,
   getHackatom,
   makeRandomAddress,
-  makeSignedTx,
   pendingWithoutWasmd,
   wasmd,
   wasmdEnabled,
@@ -126,8 +126,8 @@ async function executeContract(
 
   const { account_number, sequence } = (await client.auth.account(alice.address0)).result.value;
   const signDoc = makeSignDoc([theMsg], fee, wasmd.chainId, memo, account_number, sequence);
-  const { signature } = await signer.sign(alice.address0, signDoc);
-  const signedTx = makeSignedTx(theMsg, fee, memo, signature);
+  const { signed, signature } = await signer.sign(alice.address0, signDoc);
+  const signedTx = makeStdTx(signed, signature);
   return client.broadcastTx(signedTx);
 }
 
diff --git a/packages/cosmwasm/src/signingcosmwasmclient.ts b/packages/cosmwasm/src/signingcosmwasmclient.ts
index 07ff9fa8..1930deb7 100644
--- a/packages/cosmwasm/src/signingcosmwasmclient.ts
+++ b/packages/cosmwasm/src/signingcosmwasmclient.ts
@@ -12,11 +12,11 @@ import {
   GasPrice,
   isBroadcastTxFailure,
   makeSignDoc,
+  makeStdTx,
   Msg,
   MsgSend,
   OfflineSigner,
   StdFee,
-  StdTx,
 } from "@cosmjs/launchpad";
 import { Uint53 } from "@cosmjs/math";
 import pako from "pako";
@@ -361,13 +361,8 @@ export class SigningCosmWasmClient extends CosmWasmClient {
     const { accountNumber, sequence } = await this.getSequence();
     const chainId = await this.getChainId();
     const signDoc = makeSignDoc(msgs, fee, chainId, memo, accountNumber, sequence);
-    const { signature } = await this.signer.sign(this.senderAddress, signDoc);
-    const signedTx: StdTx = {
-      msg: msgs,
-      fee: fee,
-      memo: memo,
-      signatures: [signature],
-    };
+    const { signed, signature } = await this.signer.sign(this.senderAddress, signDoc);
+    const signedTx = makeStdTx(signed, signature);
     return this.broadcastTx(signedTx);
   }
 }
diff --git a/packages/cosmwasm/src/testutils.spec.ts b/packages/cosmwasm/src/testutils.spec.ts
index 765d2e8a..fd780bf6 100644
--- a/packages/cosmwasm/src/testutils.spec.ts
+++ b/packages/cosmwasm/src/testutils.spec.ts
@@ -1,6 +1,5 @@
 import { Random } from "@cosmjs/crypto";
 import { Bech32, fromBase64 } from "@cosmjs/encoding";
-import { Msg, StdFee, StdSignature, StdTx } from "@cosmjs/launchpad";
 
 import hackatom from "./testdata/contract.json";
 
@@ -89,12 +88,3 @@ export function fromOneElementArray<T>(elements: ArrayLike<T>): T {
   if (elements.length !== 1) throw new Error(`Expected exactly one element but got ${elements.length}`);
   return elements[0];
 }
-
-export function makeSignedTx(firstMsg: Msg, fee: StdFee, memo: string, firstSignature: StdSignature): StdTx {
-  return {
-    msg: [firstMsg],
-    fee: fee,
-    memo: memo,
-    signatures: [firstSignature],
-  };
-}
diff --git a/packages/launchpad/README.md b/packages/launchpad/README.md
index 9015b820..3ecedbf0 100644
--- a/packages/launchpad/README.md
+++ b/packages/launchpad/README.md
@@ -206,13 +206,8 @@ const { account_number, sequence } = (
   await client.auth.account(myAddress)
 ).result.value;
 const signDoc = makeSignDoc([msg], fee, apiUrl, memo, account_number, sequence);
-const { signature } = await signer.sign(myAddress, signDoc);
-const signedTx: StdTx = {
-  msg: [msg],
-  fee: fee,
-  memo: memo,
-  signatures: [signature],
-};
+const { signed, signature } = await signer.sign(myAddress, signDoc);
+const signedTx = makeStdTx(signed, signature);
 const result = await client.postTx(signedTx);
 assertIsPostTxSuccess(result);
 ```
diff --git a/packages/launchpad/src/cosmosclient.searchtx.spec.ts b/packages/launchpad/src/cosmosclient.searchtx.spec.ts
index e6f06067..5ff15c3a 100644
--- a/packages/launchpad/src/cosmosclient.searchtx.spec.ts
+++ b/packages/launchpad/src/cosmosclient.searchtx.spec.ts
@@ -16,7 +16,7 @@ import {
   wasmd,
   wasmdEnabled,
 } from "./testutils.spec";
-import { WrappedStdTx } from "./tx";
+import { makeStdTx, WrappedStdTx } from "./tx";
 
 interface TestTxSend {
   readonly sender: string;
@@ -56,15 +56,10 @@ describe("CosmosClient.searchTx", () => {
         const { accountNumber, sequence } = await client.getSequence();
         const chainId = await client.getChainId();
         const signDoc = makeSignDoc([sendMsg], fee, chainId, memo, accountNumber, sequence);
-        const { signature } = await wallet.sign(walletAddress, signDoc);
+        const { signed, signature } = await wallet.sign(walletAddress, signDoc);
         const tx: WrappedStdTx = {
           type: "cosmos-sdk/StdTx",
-          value: {
-            msg: [sendMsg],
-            fee: fee,
-            memo: memo,
-            signatures: [signature],
-          },
+          value: makeStdTx(signed, signature),
         };
         const transactionId = await client.getIdentifier(tx);
         const result = await client.broadcastTx(tx.value);
diff --git a/packages/launchpad/src/cosmosclient.spec.ts b/packages/launchpad/src/cosmosclient.spec.ts
index 4cf1deba..95ee11b3 100644
--- a/packages/launchpad/src/cosmosclient.spec.ts
+++ b/packages/launchpad/src/cosmosclient.spec.ts
@@ -16,7 +16,7 @@ import {
   unused,
   wasmd,
 } from "./testutils.spec";
-import { isWrappedStdTx, StdTx } from "./tx";
+import { isWrappedStdTx, makeStdTx } from "./tx";
 import { StdFee } from "./types";
 
 const blockTime = 1_000; // ms
@@ -232,13 +232,8 @@ describe("CosmosClient", () => {
       const chainId = await client.getChainId();
       const { accountNumber, sequence } = await client.getSequence(faucet.address);
       const signDoc = makeSignDoc([sendMsg], fee, chainId, memo, accountNumber, sequence);
-      const { signature } = await wallet.sign(walletAddress, signDoc);
-      const signedTx: StdTx = {
-        msg: [sendMsg],
-        fee: fee,
-        memo: memo,
-        signatures: [signature],
-      };
+      const { signed, signature } = await wallet.sign(walletAddress, signDoc);
+      const signedTx = makeStdTx(signed, signature);
       const txResult = await client.broadcastTx(signedTx);
       assertIsBroadcastTxSuccess(txResult);
       const { logs, transactionHash } = txResult;
diff --git a/packages/launchpad/src/encoding.ts b/packages/launchpad/src/encoding.ts
index 970d69b1..81bafa2f 100644
--- a/packages/launchpad/src/encoding.ts
+++ b/packages/launchpad/src/encoding.ts
@@ -1,7 +1,7 @@
 /* eslint-disable @typescript-eslint/naming-convention */
 import { toUtf8 } from "@cosmjs/encoding";
+import { Uint53 } from "@cosmjs/math";
 
-import { uint64ToString } from "./lcdapi";
 import { Msg } from "./msgs";
 import { StdFee } from "./types";
 
@@ -47,8 +47,8 @@ export function makeSignDoc(
 ): StdSignDoc {
   return {
     chain_id: chainId,
-    account_number: uint64ToString(accountNumber),
-    sequence: uint64ToString(sequence),
+    account_number: Uint53.fromString(accountNumber.toString()).toString(),
+    sequence: Uint53.fromString(sequence.toString()).toString(),
     fee: fee,
     msgs: msgs,
     memo: memo,
diff --git a/packages/launchpad/src/index.ts b/packages/launchpad/src/index.ts
index ed8aa4ad..a703e61f 100644
--- a/packages/launchpad/src/index.ts
+++ b/packages/launchpad/src/index.ts
@@ -100,7 +100,7 @@ export { findSequenceForSignedTx } from "./sequence";
 export { encodeSecp256k1Signature, decodeSignature } from "./signature";
 export { AccountData, Algo, OfflineSigner, SignResponse } from "./signer";
 export { CosmosFeeTable, SigningCosmosClient } from "./signingcosmosclient";
-export { isStdTx, isWrappedStdTx, CosmosSdkTx, StdTx, WrappedStdTx, WrappedTx } from "./tx";
+export { isStdTx, isWrappedStdTx, makeStdTx, CosmosSdkTx, StdTx, WrappedStdTx, WrappedTx } from "./tx";
 export { pubkeyType, PubKey, StdFee, StdSignature } from "./types";
 export { makeCosmoshubPath, executeKdf, KdfConfiguration } from "./wallet";
 export { extractKdfConfiguration, Secp256k1Wallet } from "./secp256k1wallet";
diff --git a/packages/launchpad/src/lcdapi/distribution.spec.ts b/packages/launchpad/src/lcdapi/distribution.spec.ts
index df624284..dc9f402e 100644
--- a/packages/launchpad/src/lcdapi/distribution.spec.ts
+++ b/packages/launchpad/src/lcdapi/distribution.spec.ts
@@ -16,6 +16,7 @@ import {
   wasmd,
   wasmdEnabled,
 } from "../testutils.spec";
+import { makeStdTx } from "../tx";
 import { DistributionExtension, setupDistributionExtension } from "./distribution";
 import { LcdClient } from "./lcdclient";
 
@@ -46,15 +47,10 @@ describe("DistributionExtension", () => {
       const memo = "Test delegation for wasmd";
       const { accountNumber, sequence } = await client.getSequence();
       const signDoc = makeSignDoc([msg], defaultFee, chainId, memo, accountNumber, sequence);
-      const { signature } = await wallet.sign(faucet.address, signDoc);
-      const tx = {
-        msg: [msg],
-        fee: defaultFee,
-        memo: memo,
-        signatures: [signature],
-      };
+      const { signed, signature } = await wallet.sign(faucet.address, signDoc);
+      const signedTx = makeStdTx(signed, signature);
 
-      const result = await client.broadcastTx(tx);
+      const result = await client.broadcastTx(signedTx);
       assertIsBroadcastTxSuccess(result);
 
       await sleep(75); // wait until transactions are indexed
diff --git a/packages/launchpad/src/lcdapi/lcdclient.spec.ts b/packages/launchpad/src/lcdapi/lcdclient.spec.ts
index b971823b..051d8d86 100644
--- a/packages/launchpad/src/lcdapi/lcdclient.spec.ts
+++ b/packages/launchpad/src/lcdapi/lcdclient.spec.ts
@@ -12,7 +12,6 @@ import cosmoshub from "../testdata/cosmoshub.json";
 import {
   faucet,
   makeRandomAddress,
-  makeSignedTx,
   nonNegativeIntegerMatcher,
   pendingWithoutWasmd,
   tendermintIdMatcher,
@@ -20,7 +19,7 @@ import {
   wasmd,
   wasmdEnabled,
 } from "../testutils.spec";
-import { isWrappedStdTx, StdTx } from "../tx";
+import { isWrappedStdTx, makeStdTx, StdTx } from "../tx";
 import { StdFee } from "../types";
 import { makeCosmoshubPath } from "../wallet";
 import { setupAuthExtension } from "./auth";
@@ -241,13 +240,8 @@ describe("LcdClient", () => {
           const { accountNumber, sequence } = await client.getSequence();
           const chainId = await client.getChainId();
           const signDoc = makeSignDoc([sendMsg], fee, chainId, memo, accountNumber, sequence);
-          const { signature } = await wallet.sign(walletAddress, signDoc);
-          const signedTx: StdTx = {
-            msg: [sendMsg],
-            fee: fee,
-            memo: memo,
-            signatures: [signature],
-          };
+          const { signed, signature } = await wallet.sign(walletAddress, signDoc);
+          const signedTx = makeStdTx(signed, signature);
           const transactionId = await client.getIdentifier({ type: "cosmos-sdk/StdTx", value: signedTx });
           const result = await client.broadcastTx(signedTx);
           assert(isBroadcastTxFailure(result));
@@ -540,8 +534,8 @@ describe("LcdClient", () => {
       const { account_number, sequence } = (await client.auth.account(faucet.address)).result.value;
 
       const signDoc = makeSignDoc([theMsg], fee, wasmd.chainId, memo, account_number, sequence);
-      const { signature } = await wallet.sign(walletAddress, signDoc);
-      const signedTx = makeSignedTx(theMsg, fee, memo, signature);
+      const { signed, signature } = await wallet.sign(walletAddress, signDoc);
+      const signedTx = makeStdTx(signed, signature);
       const result = await client.broadcastTx(signedTx);
       expect(result.code).toBeUndefined();
       expect(result).toEqual({
@@ -661,13 +655,8 @@ describe("LcdClient", () => {
       const { account_number, sequence } = (await client.auth.account(walletAddress)).result.value;
 
       const signDoc = makeSignDoc([msg1, msg2], fee, wasmd.chainId, memo, account_number, sequence);
-      const { signature } = await wallet.sign(walletAddress, signDoc);
-      const signedTx: StdTx = {
-        msg: [msg1, msg2],
-        fee: fee,
-        memo: memo,
-        signatures: [signature],
-      };
+      const { signed, signature } = await wallet.sign(walletAddress, signDoc);
+      const signedTx = makeStdTx(signed, signature);
       const broadcastResult = await client.broadcastTx(signedTx);
       expect(broadcastResult.code).toBeUndefined();
     });
diff --git a/packages/launchpad/src/lcdapi/staking.spec.ts b/packages/launchpad/src/lcdapi/staking.spec.ts
index a188fa89..c7e1439a 100644
--- a/packages/launchpad/src/lcdapi/staking.spec.ts
+++ b/packages/launchpad/src/lcdapi/staking.spec.ts
@@ -16,6 +16,7 @@ import {
   wasmd,
   wasmdEnabled,
 } from "../testutils.spec";
+import { makeStdTx } from "../tx";
 import { LcdClient } from "./lcdclient";
 import { BondStatus, setupStakingExtension, StakingExtension } from "./staking";
 
@@ -47,15 +48,10 @@ describe("StakingExtension", () => {
         const memo = "Test delegation for wasmd";
         const { accountNumber, sequence } = await client.getSequence();
         const signDoc = makeSignDoc([msg], defaultFee, chainId, memo, accountNumber, sequence);
-        const { signature } = await wallet.sign(faucet.address, signDoc);
-        const tx = {
-          msg: [msg],
-          fee: defaultFee,
-          memo: memo,
-          signatures: [signature],
-        };
+        const { signed, signature } = await wallet.sign(faucet.address, signDoc);
+        const signedTx = makeStdTx(signed, signature);
 
-        const result = await client.broadcastTx(tx);
+        const result = await client.broadcastTx(signedTx);
         assertIsBroadcastTxSuccess(result);
       }
       {
@@ -70,15 +66,10 @@ describe("StakingExtension", () => {
         const memo = "Test undelegation for wasmd";
         const { accountNumber, sequence } = await client.getSequence();
         const signDoc = makeSignDoc([msg], defaultFee, chainId, memo, accountNumber, sequence);
-        const { signature } = await wallet.sign(faucet.address, signDoc);
-        const tx = {
-          msg: [msg],
-          fee: defaultFee,
-          memo: memo,
-          signatures: [signature],
-        };
+        const { signed, signature } = await wallet.sign(faucet.address, signDoc);
+        const signedTx = makeStdTx(signed, signature);
 
-        const result = await client.broadcastTx(tx);
+        const result = await client.broadcastTx(signedTx);
         assertIsBroadcastTxSuccess(result);
       }
 
diff --git a/packages/launchpad/src/secp256k1wallet.spec.ts b/packages/launchpad/src/secp256k1wallet.spec.ts
index 87d6c7a9..f7f6f867 100644
--- a/packages/launchpad/src/secp256k1wallet.spec.ts
+++ b/packages/launchpad/src/secp256k1wallet.spec.ts
@@ -120,10 +120,11 @@ describe("Secp256k1Wallet", () => {
         account_number: "7",
         sequence: "54",
       };
-      const { signature } = await wallet.sign(defaultAddress, signDoc);
+      const { signed, signature } = await wallet.sign(defaultAddress, signDoc);
+      expect(signed).toEqual(signDoc);
       const valid = await Secp256k1.verifySignature(
         Secp256k1Signature.fromFixedLength(fromBase64(signature.signature)),
-        new Sha256(serializeSignDoc(signDoc)).digest(),
+        new Sha256(serializeSignDoc(signed)).digest(),
         defaultPubkey,
       );
       expect(valid).toEqual(true);
diff --git a/packages/launchpad/src/signingcosmosclient.ts b/packages/launchpad/src/signingcosmosclient.ts
index 0c1edd5c..77090274 100644
--- a/packages/launchpad/src/signingcosmosclient.ts
+++ b/packages/launchpad/src/signingcosmosclient.ts
@@ -6,7 +6,7 @@ import { buildFeeTable, FeeTable, GasLimits, GasPrice } from "./gas";
 import { BroadcastMode } from "./lcdapi";
 import { Msg, MsgSend } from "./msgs";
 import { OfflineSigner } from "./signer";
-import { StdTx } from "./tx";
+import { makeStdTx } from "./tx";
 import { StdFee } from "./types";
 
 /**
@@ -90,13 +90,8 @@ export class SigningCosmosClient extends CosmosClient {
     const { accountNumber, sequence } = await this.getSequence();
     const chainId = await this.getChainId();
     const signDoc = makeSignDoc(msgs, fee, chainId, memo, accountNumber, sequence);
-    const { signature } = await this.signer.sign(this.senderAddress, signDoc);
-    const signedTx: StdTx = {
-      msg: msgs,
-      fee: fee,
-      memo: memo,
-      signatures: [signature],
-    };
+    const { signed, signature } = await this.signer.sign(this.senderAddress, signDoc);
+    const signedTx = makeStdTx(signed, signature);
     return this.broadcastTx(signedTx);
   }
 }
diff --git a/packages/launchpad/src/testutils.spec.ts b/packages/launchpad/src/testutils.spec.ts
index 335880b1..66a0f592 100644
--- a/packages/launchpad/src/testutils.spec.ts
+++ b/packages/launchpad/src/testutils.spec.ts
@@ -1,10 +1,6 @@
 import { Random } from "@cosmjs/crypto";
 import { Bech32 } from "@cosmjs/encoding";
 
-import { Msg } from "./msgs";
-import { StdTx } from "./tx";
-import { StdFee, StdSignature } from "./types";
-
 export function makeRandomAddress(): string {
   return Bech32.encode("cosmos", Random.getBytes(20));
 }
@@ -75,12 +71,3 @@ export function fromOneElementArray<T>(elements: ArrayLike<T>): T {
   if (elements.length !== 1) throw new Error(`Expected exactly one element but got ${elements.length}`);
   return elements[0];
 }
-
-export function makeSignedTx(firstMsg: Msg, fee: StdFee, memo: string, firstSignature: StdSignature): StdTx {
-  return {
-    msg: [firstMsg],
-    fee: fee,
-    memo: memo,
-    signatures: [firstSignature],
-  };
-}
diff --git a/packages/launchpad/src/tx.spec.ts b/packages/launchpad/src/tx.spec.ts
new file mode 100644
index 00000000..21bf834f
--- /dev/null
+++ b/packages/launchpad/src/tx.spec.ts
@@ -0,0 +1,54 @@
+/* eslint-disable @typescript-eslint/naming-convention */
+import { coins } from "./coins";
+import { makeSignDoc } from "./encoding";
+import { makeStdTx } from "./tx";
+import { StdFee, StdSignature } from "./types";
+
+describe("tx", () => {
+  describe("makeStdTx", () => {
+    it("can make an StdTx from a SignDoc and one signature", () => {
+      const fee: StdFee = { amount: coins(123, "ucosm"), gas: "22" };
+      const signDoc = makeSignDoc([], fee, "chain-xy", "hello", 3, 4);
+      const signature: StdSignature = {
+        pub_key: {
+          type: "tendermint/PubKeySecp256k1",
+          value: "AtQaCqFnshaZQp6rIkvAPyzThvCvXSDO+9AzbxVErqJP",
+        },
+        signature: "1nUcIH0CLT0/nQ0mBTDrT6kMG20NY/PsH7P2gc4bpYNGLEYjBmdWevXUJouSE/9A/60QG9cYeqyTe5kFDeIPxQ==",
+      };
+      const signedTx = makeStdTx(signDoc, signature);
+      expect(signedTx).toEqual({
+        msg: [],
+        memo: "hello",
+        fee: fee,
+        signatures: [signature],
+      });
+    });
+
+    it("can make an StdTx from a SignDoc and multiple signatures", () => {
+      const fee: StdFee = { amount: coins(123, "ucosm"), gas: "22" };
+      const signDoc = makeSignDoc([], fee, "chain-xy", "hello", 3, 4);
+      const signature1: StdSignature = {
+        pub_key: {
+          type: "tendermint/PubKeySecp256k1",
+          value: "AtQaCqFnshaZQp6rIkvAPyzThvCvXSDO+9AzbxVErqJP",
+        },
+        signature: "1nUcIH0CLT0/nQ0mBTDrT6kMG20NY/PsH7P2gc4bpYNGLEYjBmdWevXUJouSE/9A/60QG9cYeqyTe5kFDeIPxQ==",
+      };
+      const signature2: StdSignature = {
+        pub_key: {
+          type: "tendermint/PubKeySecp256k1",
+          value: "A5qFcJBJvEK/fOmEAY0DHNWwSRZ9TEfNZyH8VoVvDtAq",
+        },
+        signature: "NK1Oy4EUGAsoC03c1wi9GG03JC/39LEdautC5Jk643oIbEPqeXHMwaqbdvO/Jws0X/NAXaN8SAy2KNY5Qml+5Q==",
+      };
+      const signedTx = makeStdTx(signDoc, [signature1, signature2]);
+      expect(signedTx).toEqual({
+        msg: [],
+        memo: "hello",
+        fee: fee,
+        signatures: [signature1, signature2],
+      });
+    });
+  });
+});
diff --git a/packages/launchpad/src/tx.ts b/packages/launchpad/src/tx.ts
index 53c0198c..a466c9f4 100644
--- a/packages/launchpad/src/tx.ts
+++ b/packages/launchpad/src/tx.ts
@@ -1,3 +1,4 @@
+import { StdSignDoc } from "./encoding";
 import { Msg } from "./msgs";
 import { StdFee, StdSignature } from "./types";
 
@@ -20,6 +21,18 @@ export function isStdTx(txValue: unknown): txValue is StdTx {
   );
 }
 
+export function makeStdTx(
+  content: Pick<StdSignDoc, "msgs" | "fee" | "memo">,
+  signatures: StdSignature | readonly StdSignature[],
+): StdTx {
+  return {
+    msg: content.msgs,
+    fee: content.fee,
+    memo: content.memo,
+    signatures: Array.isArray(signatures) ? signatures : [signatures],
+  };
+}
+
 /**
  * An Amino JSON wrapper around the Tx interface
  */
diff --git a/packages/launchpad/types/index.d.ts b/packages/launchpad/types/index.d.ts
index 4a87457a..196653ce 100644
--- a/packages/launchpad/types/index.d.ts
+++ b/packages/launchpad/types/index.d.ts
@@ -98,7 +98,7 @@ export { findSequenceForSignedTx } from "./sequence";
 export { encodeSecp256k1Signature, decodeSignature } from "./signature";
 export { AccountData, Algo, OfflineSigner, SignResponse } from "./signer";
 export { CosmosFeeTable, SigningCosmosClient } from "./signingcosmosclient";
-export { isStdTx, isWrappedStdTx, CosmosSdkTx, StdTx, WrappedStdTx, WrappedTx } from "./tx";
+export { isStdTx, isWrappedStdTx, makeStdTx, CosmosSdkTx, StdTx, WrappedStdTx, WrappedTx } from "./tx";
 export { pubkeyType, PubKey, StdFee, StdSignature } from "./types";
 export { makeCosmoshubPath, executeKdf, KdfConfiguration } from "./wallet";
 export { extractKdfConfiguration, Secp256k1Wallet } from "./secp256k1wallet";
diff --git a/packages/launchpad/types/tx.d.ts b/packages/launchpad/types/tx.d.ts
index 8bf6134e..501dc880 100644
--- a/packages/launchpad/types/tx.d.ts
+++ b/packages/launchpad/types/tx.d.ts
@@ -1,3 +1,4 @@
+import { StdSignDoc } from "./encoding";
 import { Msg } from "./msgs";
 import { StdFee, StdSignature } from "./types";
 /**
@@ -12,6 +13,10 @@ export interface StdTx {
   readonly memo: string | undefined;
 }
 export declare function isStdTx(txValue: unknown): txValue is StdTx;
+export declare function makeStdTx(
+  content: Pick<StdSignDoc, "msgs" | "fee" | "memo">,
+  signatures: StdSignature | readonly StdSignature[],
+): StdTx;
 /**
  * An Amino JSON wrapper around the Tx interface
  */