diff --git a/CHANGELOG.md b/CHANGELOG.md
index d85a0ac1..e039e715 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## 0.23.0 (unreleased)
 
+- @cosmjs/cli: Expose `HdPath` type.
 - @cosmjs/cosmwasm: Rename `CosmWasmClient.postTx` method to `.broadcastTx`.
 - @cosmjs/cosmwasm: Rename `FeeTable` type to `CosmWasmFeeTable`.
 - @cosmjs/cosmwasm: `SigningCosmWasmClient` constructor now takes optional
@@ -13,6 +14,8 @@
   init, migrate and handle messages (in `WasmExtension.wasm.queryContractSmart`,
   `CosmWasmClient.queryContractSmart`, `SigningCosmWasmClient.instantiate`,
   `SigningCosmWasmClient.migrate`, `SigningCosmWasmClient.execute`).
+- @cosmjs/crypto: Export new type alias `HdPath`.
+- @cosmjs/crypto: Add `Secp256k1Signature.toFixedLength` method.
 - @cosmjs/demo-staking: Remove package and supporting scripts.
 - @cosmjs/encoding: Add `limit` parameter to `Bech32.encode` and `.decode`. The
   new default limit for decoding is infinity (was 90 before). Set it to 90 to
@@ -42,6 +45,9 @@
   `isSearchBySentFromOrToQuery` and `isSearchByTagsQuery`.
 - @cosmjs/launchpad: Change type of `TxsResponse.logs` and
   `BroadcastTxsResponse.logs` to `unknown[]`.
+- @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.
 - @cosmjs/math: Add `.multiply` method to `Decimal` class.
 - @cosmjs/tendermint-rpc: Make `BroadcastTxCommitResponse.height` non-optional.
 - @cosmjs/tendermint-rpc: Change type of `GenesisResponse.appState` to
diff --git a/packages/cli/examples/coralnet.ts b/packages/cli/examples/coralnet.ts
index 9a489f66..c6c9117c 100644
--- a/packages/cli/examples/coralnet.ts
+++ b/packages/cli/examples/coralnet.ts
@@ -1,20 +1,20 @@
 interface Options {
   readonly httpUrl: string;
   readonly bech32prefix: string;
-  readonly hdPath: readonly Slip10RawIndex[];
+  readonly hdPath: HdPath;
   readonly gasPrice: GasPrice;
   readonly gasLimits: Partial<GasLimits<CosmWasmFeeTable>>; // only set the ones you want to override
 }
 
 const coralnetOptions: Options = {
-  httpUrl: 'https://lcd.coralnet.cosmwasm.com',
+  httpUrl: "https://lcd.coralnet.cosmwasm.com",
   gasPrice: GasPrice.fromString("0.025ushell"),
-  bech32prefix: 'coral',
+  bech32prefix: "coral",
   hdPath: makeCosmoshubPath(0),
-  gasLimits:  {
+  gasLimits: {
     upload: 1500000,
-  }
-}
+  },
+};
 
 const wallet = await Secp256k1Wallet.generate(12, coralnetOptions.hdPath, coralnetOptions.bech32prefix);
 const [{ address }] = await wallet.getAccounts();
diff --git a/packages/cli/src/cli.ts b/packages/cli/src/cli.ts
index e84a737e..b338bce1 100644
--- a/packages/cli/src/cli.ts
+++ b/packages/cli/src/cli.ts
@@ -71,6 +71,7 @@ export async function main(originalArgs: readonly string[]): Promise<void> {
         "Ed25519",
         "Ed25519Keypair",
         "EnglishMnemonic",
+        "HdPath",
         "Random",
         "Secp256k1",
         "Sha256",
diff --git a/packages/crypto/src/index.ts b/packages/crypto/src/index.ts
index 925865b3..bd19288f 100644
--- a/packages/crypto/src/index.ts
+++ b/packages/crypto/src/index.ts
@@ -18,6 +18,7 @@ export { Secp256k1, Secp256k1Keypair } from "./secp256k1";
 export { ExtendedSecp256k1Signature, Secp256k1Signature } from "./secp256k1signature";
 export { Sha1, Sha256, Sha512 } from "./sha";
 export {
+  HdPath,
   pathToString,
   stringToPath,
   Slip10,
diff --git a/packages/crypto/src/secp256k1signature.spec.ts b/packages/crypto/src/secp256k1signature.spec.ts
index 27b58767..9baa7fe6 100644
--- a/packages/crypto/src/secp256k1signature.spec.ts
+++ b/packages/crypto/src/secp256k1signature.spec.ts
@@ -76,6 +76,15 @@ describe("Secp256k1Signature", () => {
     ).toThrowError(/unsigned integer s must be encoded as unpadded big endian./i);
   });
 
+  it("can be encoded as fixed length", () => {
+    const signature = new Secp256k1Signature(new Uint8Array([0x22, 0x33]), new Uint8Array([0xaa]));
+    expect(signature.toFixedLength()).toEqual(
+      fromHex(
+        "000000000000000000000000000000000000000000000000000000000000223300000000000000000000000000000000000000000000000000000000000000aa",
+      ),
+    );
+  });
+
   it("can encode to DER", () => {
     // Signature 3045022100f25b86e1d8a11d72475b3ed273b0781c7d7f6f9e1dae0dd5d3ee9b84f3fab891022063d9c4e1391de077244583e9a6e3d8e8e1f236a3bf5963735353b93b1a3ba935
     // decoded by http://asn1-playground.oss.com/
diff --git a/packages/crypto/src/secp256k1signature.ts b/packages/crypto/src/secp256k1signature.ts
index 0defcb19..be10f026 100644
--- a/packages/crypto/src/secp256k1signature.ts
+++ b/packages/crypto/src/secp256k1signature.ts
@@ -119,6 +119,10 @@ export class Secp256k1Signature {
     }
   }
 
+  public toFixedLength(): Uint8Array {
+    return new Uint8Array([...this.r(32), ...this.s(32)]);
+  }
+
   public toDer(): Uint8Array {
     // DER supports negative integers but our data is unsigned. Thus we need to prepend
     // a leading 0 byte when the higest bit is set to differentiate nagative values
diff --git a/packages/crypto/src/slip10.spec.ts b/packages/crypto/src/slip10.spec.ts
index 52718df8..7dc72565 100644
--- a/packages/crypto/src/slip10.spec.ts
+++ b/packages/crypto/src/slip10.spec.ts
@@ -1,6 +1,7 @@
 import { fromHex } from "@cosmjs/encoding";
 
 import {
+  HdPath,
   pathToString,
   Slip10,
   Slip10Curve,
@@ -22,7 +23,7 @@ describe("Slip10", () => {
     const seed = fromHex("000102030405060708090a0b0c0d0e0f");
 
     it("can derive path m", () => {
-      const path: readonly Slip10RawIndex[] = [];
+      const path: HdPath = [];
       const derived = Slip10.derivePath(Slip10Curve.Secp256k1, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("873dff81c02f525623fd1fe5167eac3a55a049de3d314bb42ee227ffed37d508"),
@@ -33,7 +34,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'", () => {
-      const path: readonly Slip10RawIndex[] = [Slip10RawIndex.hardened(0)];
+      const path: HdPath = [Slip10RawIndex.hardened(0)];
       const derived = Slip10.derivePath(Slip10Curve.Secp256k1, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("47fdacbd0f1097043b78c63c20c34ef4ed9a111d980047ad16282c7ae6236141"),
@@ -44,7 +45,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/1", () => {
-      const path: readonly Slip10RawIndex[] = [Slip10RawIndex.hardened(0), Slip10RawIndex.normal(1)];
+      const path: HdPath = [Slip10RawIndex.hardened(0), Slip10RawIndex.normal(1)];
       const derived = Slip10.derivePath(Slip10Curve.Secp256k1, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("2a7857631386ba23dacac34180dd1983734e444fdbf774041578e9b6adb37c19"),
@@ -55,11 +56,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/1/2'", () => {
-      const path: readonly Slip10RawIndex[] = [
-        Slip10RawIndex.hardened(0),
-        Slip10RawIndex.normal(1),
-        Slip10RawIndex.hardened(2),
-      ];
+      const path: HdPath = [Slip10RawIndex.hardened(0), Slip10RawIndex.normal(1), Slip10RawIndex.hardened(2)];
       const derived = Slip10.derivePath(Slip10Curve.Secp256k1, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("04466b9cc8e161e966409ca52986c584f07e9dc81f735db683c3ff6ec7b1503f"),
@@ -70,7 +67,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/1/2'/2", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.hardened(0),
         Slip10RawIndex.normal(1),
         Slip10RawIndex.hardened(2),
@@ -86,7 +83,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/1/2'/2/1000000000", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.hardened(0),
         Slip10RawIndex.normal(1),
         Slip10RawIndex.hardened(2),
@@ -110,7 +107,7 @@ describe("Slip10", () => {
     );
 
     it("can derive path m", () => {
-      const path: readonly Slip10RawIndex[] = [];
+      const path: HdPath = [];
       const derived = Slip10.derivePath(Slip10Curve.Secp256k1, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("60499f801b896d83179a4374aeb7822aaeaceaa0db1f85ee3e904c4defbd9689"),
@@ -121,7 +118,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0", () => {
-      const path: readonly Slip10RawIndex[] = [Slip10RawIndex.normal(0)];
+      const path: HdPath = [Slip10RawIndex.normal(0)];
       const derived = Slip10.derivePath(Slip10Curve.Secp256k1, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("f0909affaa7ee7abe5dd4e100598d4dc53cd709d5a5c2cac40e7412f232f7c9c"),
@@ -132,7 +129,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0/2147483647'", () => {
-      const path: readonly Slip10RawIndex[] = [Slip10RawIndex.normal(0), Slip10RawIndex.hardened(2147483647)];
+      const path: HdPath = [Slip10RawIndex.normal(0), Slip10RawIndex.hardened(2147483647)];
       const derived = Slip10.derivePath(Slip10Curve.Secp256k1, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("be17a268474a6bb9c61e1d720cf6215e2a88c5406c4aee7b38547f585c9a37d9"),
@@ -143,7 +140,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0/2147483647'/1", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.normal(0),
         Slip10RawIndex.hardened(2147483647),
         Slip10RawIndex.normal(1),
@@ -158,7 +155,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0/2147483647'/1/2147483646'", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.normal(0),
         Slip10RawIndex.hardened(2147483647),
         Slip10RawIndex.normal(1),
@@ -174,7 +171,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0/2147483647'/1/2147483646'/2", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.normal(0),
         Slip10RawIndex.hardened(2147483647),
         Slip10RawIndex.normal(1),
@@ -196,7 +193,7 @@ describe("Slip10", () => {
     const seed = fromHex("000102030405060708090a0b0c0d0e0f");
 
     it("can derive path m", () => {
-      const path: readonly Slip10RawIndex[] = [];
+      const path: HdPath = [];
       const derived = Slip10.derivePath(Slip10Curve.Ed25519, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("90046a93de5380a72b5e45010748567d5ea02bbf6522f979e05c0d8d8ca9fffb"),
@@ -207,7 +204,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'", () => {
-      const path: readonly Slip10RawIndex[] = [Slip10RawIndex.hardened(0)];
+      const path: HdPath = [Slip10RawIndex.hardened(0)];
       const derived = Slip10.derivePath(Slip10Curve.Ed25519, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("8b59aa11380b624e81507a27fedda59fea6d0b779a778918a2fd3590e16e9c69"),
@@ -218,7 +215,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/1'", () => {
-      const path: readonly Slip10RawIndex[] = [Slip10RawIndex.hardened(0), Slip10RawIndex.hardened(1)];
+      const path: HdPath = [Slip10RawIndex.hardened(0), Slip10RawIndex.hardened(1)];
       const derived = Slip10.derivePath(Slip10Curve.Ed25519, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("a320425f77d1b5c2505a6b1b27382b37368ee640e3557c315416801243552f14"),
@@ -229,7 +226,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/1'/2'", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.hardened(0),
         Slip10RawIndex.hardened(1),
         Slip10RawIndex.hardened(2),
@@ -244,7 +241,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/1'/2'/2'", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.hardened(0),
         Slip10RawIndex.hardened(1),
         Slip10RawIndex.hardened(2),
@@ -260,7 +257,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/1'/2'/2'/1000000000'", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.hardened(0),
         Slip10RawIndex.hardened(1),
         Slip10RawIndex.hardened(2),
@@ -284,7 +281,7 @@ describe("Slip10", () => {
     );
 
     it("can derive path m", () => {
-      const path: readonly Slip10RawIndex[] = [];
+      const path: HdPath = [];
       const derived = Slip10.derivePath(Slip10Curve.Ed25519, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("ef70a74db9c3a5af931b5fe73ed8e1a53464133654fd55e7a66f8570b8e33c3b"),
@@ -295,7 +292,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'", () => {
-      const path: readonly Slip10RawIndex[] = [Slip10RawIndex.hardened(0)];
+      const path: HdPath = [Slip10RawIndex.hardened(0)];
       const derived = Slip10.derivePath(Slip10Curve.Ed25519, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("0b78a3226f915c082bf118f83618a618ab6dec793752624cbeb622acb562862d"),
@@ -306,10 +303,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/2147483647'", () => {
-      const path: readonly Slip10RawIndex[] = [
-        Slip10RawIndex.hardened(0),
-        Slip10RawIndex.hardened(2147483647),
-      ];
+      const path: HdPath = [Slip10RawIndex.hardened(0), Slip10RawIndex.hardened(2147483647)];
       const derived = Slip10.derivePath(Slip10Curve.Ed25519, seed, path);
       expect(derived.chainCode).toEqual(
         fromHex("138f0b2551bcafeca6ff2aa88ba8ed0ed8de070841f0c4ef0165df8181eaad7f"),
@@ -320,7 +314,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/2147483647'/1'", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.hardened(0),
         Slip10RawIndex.hardened(2147483647),
         Slip10RawIndex.hardened(1),
@@ -335,7 +329,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/2147483647'/1'/2147483646'", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.hardened(0),
         Slip10RawIndex.hardened(2147483647),
         Slip10RawIndex.hardened(1),
@@ -351,7 +345,7 @@ describe("Slip10", () => {
     });
 
     it("can derive path m/0'/2147483647'/1'/2147483646'/2'", () => {
-      const path: readonly Slip10RawIndex[] = [
+      const path: HdPath = [
         Slip10RawIndex.hardened(0),
         Slip10RawIndex.hardened(2147483647),
         Slip10RawIndex.hardened(1),
diff --git a/packages/crypto/src/slip10.ts b/packages/crypto/src/slip10.ts
index 9f507954..39a0bd8a 100644
--- a/packages/crypto/src/slip10.ts
+++ b/packages/crypto/src/slip10.ts
@@ -49,16 +49,14 @@ export class Slip10RawIndex extends Uint32 {
   }
 }
 
+export type HdPath = readonly Slip10RawIndex[];
+
 const secp256k1 = new elliptic.ec("secp256k1");
 
 // Universal private key derivation accoring to
 // https://github.com/satoshilabs/slips/blob/master/slip-0010.md
 export class Slip10 {
-  public static derivePath(
-    curve: Slip10Curve,
-    seed: Uint8Array,
-    path: readonly Slip10RawIndex[],
-  ): Slip10Result {
+  public static derivePath(curve: Slip10Curve, seed: Uint8Array, path: HdPath): Slip10Result {
     let result = this.master(curve, seed);
     for (const rawIndex of path) {
       result = this.child(curve, result.privkey, result.chainCode, rawIndex);
@@ -185,7 +183,7 @@ export class Slip10 {
   }
 }
 
-export function pathToString(path: readonly Slip10RawIndex[]): string {
+export function pathToString(path: HdPath): string {
   return path.reduce((current, component): string => {
     const componentString = component.isHardened()
       ? `${component.toNumber() - 2 ** 31}'`
@@ -194,7 +192,7 @@ export function pathToString(path: readonly Slip10RawIndex[]): string {
   }, "m");
 }
 
-export function stringToPath(input: string): readonly Slip10RawIndex[] {
+export function stringToPath(input: string): HdPath {
   if (!input.startsWith("m")) throw new Error("Path string must start with 'm'");
   let rest = input.slice(1);
 
diff --git a/packages/crypto/types/index.d.ts b/packages/crypto/types/index.d.ts
index 925865b3..bd19288f 100644
--- a/packages/crypto/types/index.d.ts
+++ b/packages/crypto/types/index.d.ts
@@ -18,6 +18,7 @@ export { Secp256k1, Secp256k1Keypair } from "./secp256k1";
 export { ExtendedSecp256k1Signature, Secp256k1Signature } from "./secp256k1signature";
 export { Sha1, Sha256, Sha512 } from "./sha";
 export {
+  HdPath,
   pathToString,
   stringToPath,
   Slip10,
diff --git a/packages/crypto/types/secp256k1signature.d.ts b/packages/crypto/types/secp256k1signature.d.ts
index 1b7a5025..627b53e2 100644
--- a/packages/crypto/types/secp256k1signature.d.ts
+++ b/packages/crypto/types/secp256k1signature.d.ts
@@ -12,6 +12,7 @@ export declare class Secp256k1Signature {
   constructor(r: Uint8Array, s: Uint8Array);
   r(length?: number): Uint8Array;
   s(length?: number): Uint8Array;
+  toFixedLength(): Uint8Array;
   toDer(): Uint8Array;
 }
 /**
diff --git a/packages/crypto/types/slip10.d.ts b/packages/crypto/types/slip10.d.ts
index ffd92295..cd90a65f 100644
--- a/packages/crypto/types/slip10.d.ts
+++ b/packages/crypto/types/slip10.d.ts
@@ -21,8 +21,9 @@ export declare class Slip10RawIndex extends Uint32 {
   static normal(normalIndex: number): Slip10RawIndex;
   isHardened(): boolean;
 }
+export declare type HdPath = readonly Slip10RawIndex[];
 export declare class Slip10 {
-  static derivePath(curve: Slip10Curve, seed: Uint8Array, path: readonly Slip10RawIndex[]): Slip10Result;
+  static derivePath(curve: Slip10Curve, seed: Uint8Array, path: HdPath): Slip10Result;
   private static master;
   private static child;
   /**
@@ -36,5 +37,5 @@ export declare class Slip10 {
   private static isGteN;
   private static n;
 }
-export declare function pathToString(path: readonly Slip10RawIndex[]): string;
-export declare function stringToPath(input: string): readonly Slip10RawIndex[];
+export declare function pathToString(path: HdPath): string;
+export declare function stringToPath(input: string): HdPath;
diff --git a/packages/launchpad-ledger/.eslintignore b/packages/launchpad-ledger/.eslintignore
new file mode 120000
index 00000000..86039baf
--- /dev/null
+++ b/packages/launchpad-ledger/.eslintignore
@@ -0,0 +1 @@
+../../.eslintignore
\ No newline at end of file
diff --git a/packages/launchpad-ledger/.gitignore b/packages/launchpad-ledger/.gitignore
new file mode 100644
index 00000000..68bf3735
--- /dev/null
+++ b/packages/launchpad-ledger/.gitignore
@@ -0,0 +1,3 @@
+build/
+dist/
+docs/
diff --git a/packages/launchpad-ledger/README.md b/packages/launchpad-ledger/README.md
new file mode 100644
index 00000000..4cd9ca24
--- /dev/null
+++ b/packages/launchpad-ledger/README.md
@@ -0,0 +1,36 @@
+# @cosmjs/launchpad-ledger
+
+[![npm version](https://img.shields.io/npm/v/@cosmjs/launchpad-ledger.svg)](https://www.npmjs.com/package/@cosmjs/launchpad-ledger)
+
+## Supported platforms
+
+We use the
+[@ledgerhq/hw-transport-webusb](https://github.com/LedgerHQ/ledgerjs/tree/master/packages/hw-transport-webusb)
+library to connect to Ledger devices from the browser via USB. You can check the
+support status of this library
+[here](https://github.com/LedgerHQ/ledgerjs/tree/master/packages/hw-transport-webusb#support-status).
+
+## Running the demo
+
+Build the package for web:
+
+```sh
+yarn pack-web
+```
+
+Host the `launchpad-ledger` package directory, for example using Python 3:
+
+```sh
+python3 -m http.server
+```
+
+Visit the demo page in a browser, for example if using the Python 3 option:
+[http://localhost:8000/demo]().
+
+Then follow the instructions on that page.
+
+## License
+
+This package is part of the cosmjs repository, licensed under the Apache License
+2.0 (see [NOTICE](https://github.com/CosmWasm/cosmjs/blob/master/NOTICE) and
+[LICENSE](https://github.com/CosmWasm/cosmjs/blob/master/LICENSE)).
diff --git a/packages/launchpad-ledger/custom_types/ledger-cosmos-js.d.ts b/packages/launchpad-ledger/custom_types/ledger-cosmos-js.d.ts
new file mode 100644
index 00000000..f49d8461
--- /dev/null
+++ b/packages/launchpad-ledger/custom_types/ledger-cosmos-js.d.ts
@@ -0,0 +1,53 @@
+declare module "ledger-cosmos-js" {
+  import Transport from "@ledgerhq/hw-transport";
+
+  export interface ErrorResponse {
+    readonly return_code: number;
+    readonly error_message: string;
+  }
+
+  export interface VersionResponse {
+    readonly major: number;
+    readonly minor: number;
+    readonly patch: number;
+    readonly test_mode: boolean;
+    readonly error_message: string;
+    readonly device_locked: boolean;
+  }
+
+  export interface AppInfoResponse {
+    readonly appName: string;
+    readonly error_message: string;
+  }
+
+  export interface PublicKeyResponse {
+    readonly compressed_pk: Buffer;
+    readonly error_message: string;
+  }
+
+  export interface AddressAndPublicKeyResponse {
+    readonly compressed_pk: Buffer;
+    readonly address: string;
+    readonly error_message: string;
+  }
+
+  export interface SignResponse {
+    readonly signature: Buffer;
+    readonly error_message: string;
+  }
+
+  export default class CosmosApp {
+    static getBech32FromPK(hrp: string, pk: Buffer): string;
+
+    constructor(transport: Transport, scrambleKey?: string);
+
+    getVersion: () => Promise<VersionResponse | ErrorResponse>;
+    appInfo: () => Promise<AppInfoResponse | ErrorResponse>;
+    publicKey: (path: Array<number>) => Promise<PublicKeyResponse | ErrorResponse>;
+    showAddressAndPubKey: (
+      path: Array<number>,
+      hrp: string,
+    ) => Promise<AddressAndPublicKeyResponse | ErrorResponse>;
+    sign: (path: Array<number>, message: string) => Promise<SignResponse | ErrorResponse>;
+  }
+}
diff --git a/packages/launchpad-ledger/demo/index.css b/packages/launchpad-ledger/demo/index.css
new file mode 100644
index 00000000..974bced3
--- /dev/null
+++ b/packages/launchpad-ledger/demo/index.css
@@ -0,0 +1,24 @@
+div {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  margin: auto;
+  padding: 0.5em;
+}
+
+button {
+  padding: 1em;
+}
+
+label {
+  margin-right: 1em;
+}
+
+input {
+  width: 32em;
+}
+
+textarea {
+  width: 32em;
+  height: 28em;
+}
diff --git a/packages/launchpad-ledger/demo/index.html b/packages/launchpad-ledger/demo/index.html
new file mode 100644
index 00000000..1575c6bd
--- /dev/null
+++ b/packages/launchpad-ledger/demo/index.html
@@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Ledger Demo</title>
+    <link rel="stylesheet" href="index.css"></style>
+    <script src="../dist/demo/ledger.js"></script>
+  </head>
+  <body>
+    <div>
+      <h1>Ledger Demo</h1>
+    </div>
+    <div>
+      <ol>
+        <li>Connect the Ledger device via USB</li>
+        <li>Open the Cosmos app on the Ledger device</li>
+        <li>Click the buttons below</li>
+      </ol>
+    </div>
+    <div>
+      <button onclick="getAccounts()">
+        Get Accounts
+      </button>
+    </div>
+    <div id="accounts"></div>
+    <div>
+      <label>Address</label>
+      <input id="address" type="text" value=""></input>
+    </div>
+    <div>
+      <label>Message</label>
+      <textarea id="message">
+      </textarea>
+    </div>
+    <div>
+      <button onclick="sign()">
+        Sign Message
+      </button>
+    </div>
+    <div id="signature"></div>
+  </body>
+</html>
diff --git a/packages/launchpad-ledger/package.json b/packages/launchpad-ledger/package.json
new file mode 100644
index 00000000..0fdc2129
--- /dev/null
+++ b/packages/launchpad-ledger/package.json
@@ -0,0 +1,52 @@
+{
+  "name": "@cosmjs/launchpad-ledger",
+  "version": "0.22.2",
+  "description": "A library for interacting with the Cosmos Launchpad Ledger Nano App",
+  "contributors": [
+    "Will Clark <willclarktech@users.noreply.github.com>"
+  ],
+  "license": "Apache-2.0",
+  "main": "build/index.js",
+  "types": "types/index.d.ts",
+  "files": [
+    "build/",
+    "types/",
+    "*.md",
+    "!*.spec.*",
+    "!**/testdata/"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/CosmWasm/cosmjs/tree/master/packages/launchpad-ledger"
+  },
+  "publishConfig": {
+    "access": "public"
+  },
+  "scripts": {
+    "docs": "typedoc --options typedoc.js",
+    "format": "prettier --write --loglevel warn \"./src/**/*.ts\"",
+    "format-text": "prettier --write --prose-wrap always --print-width 80 \"./*.md\"",
+    "lint": "eslint --max-warnings 0 \"**/*.{js,ts}\"",
+    "lint-fix": "eslint --max-warnings 0 \"**/*.{js,ts}\" --fix",
+    "move-types": "shx rm -rf ./types/* && shx mv build/types/* ./types && rm -rf ./types/testdata && shx rm -rf ./types/demo",
+    "format-types": "prettier --write --loglevel warn \"./types/**/*.d.ts\"",
+    "prebuild": "shx rm -rf ./build",
+    "build": "tsc",
+    "postbuild": "yarn move-types && yarn format-types",
+    "build-or-skip": "[ -n \"$SKIP_BUILD\" ] || yarn build",
+    "test": "echo 'Please check README for information on how to manually run the demo'",
+    "coverage": "nyc --reporter=text --reporter=lcov yarn test --quiet",
+    "pack-web": "yarn build-or-skip && webpack --mode development --config webpack.demo.config.js"
+  },
+  "dependencies": {
+    "@cosmjs/launchpad": "^0.22.2",
+    "@cosmjs/utils": "^0.22.2",
+    "@ledgerhq/hw-transport-webusb": "^5.23.0",
+    "ledger-cosmos-js": "^2.1.7",
+    "semver": "^7.3.2"
+  },
+  "devDependencies": {
+    "@types/ledgerhq__hw-transport-webusb": "^4.70.0",
+    "@types/semver": "^7.3.3"
+  }
+}
diff --git a/packages/launchpad-ledger/src/demo/index.ts b/packages/launchpad-ledger/src/demo/index.ts
new file mode 100644
index 00000000..8269c3a3
--- /dev/null
+++ b/packages/launchpad-ledger/src/demo/index.ts
@@ -0,0 +1,65 @@
+import { toHex, toUtf8 } from "@cosmjs/encoding";
+
+import { LedgerSigner } from "../ledgersigner";
+
+declare const window: any;
+declare const document: any;
+
+function createMessage(address: string): string {
+  return `{
+    "account_number": 0,
+    "chain_id": "testing",
+    "fee": {
+      "amount": [{ "amount": 100, "denom": "ucosm" }],
+      "gas": 250
+    },
+    "memo": "Some memo",
+    "msgs": [{
+      "type": "cosmos-sdk/MsgSend",
+      "value": {
+        "amount": [{
+          "amount": "1234567",
+          "denom": "ucosm"
+        }],
+        "from_address": "${address}",
+        "to_address": "${address}"
+      }
+    }],
+    "sequence": 0
+  }`;
+}
+
+const signer = new LedgerSigner({ testModeAllowed: true });
+
+window.getAccounts = async function getAccounts(): Promise<void> {
+  const addressInput = document.getElementById("address");
+  const accountsDiv = document.getElementById("accounts");
+  const messageTextArea = document.getElementById("message");
+  accountsDiv.textContent = "Loading...";
+
+  try {
+    const accounts = await signer.getAccounts();
+    const prettyAccounts = accounts.map((account) => ({ ...account, pubkey: toHex(account.pubkey) }));
+    accountsDiv.textContent = JSON.stringify(prettyAccounts, null, "\t");
+    const address = accounts[0].address;
+    addressInput.value = address;
+    messageTextArea.textContent = createMessage(address);
+  } catch (error) {
+    accountsDiv.textContent = error;
+  }
+};
+
+window.sign = async function sign(): Promise<void> {
+  const signatureDiv = document.getElementById("signature");
+  signatureDiv.textContent = "Loading...";
+
+  try {
+    const address = document.getElementById("address").value;
+    const rawMessage = document.getElementById("message").textContent;
+    const message = JSON.stringify(JSON.parse(rawMessage));
+    const signature = await signer.sign(address, toUtf8(message));
+    signatureDiv.textContent = JSON.stringify(signature, null, "\t");
+  } catch (error) {
+    signatureDiv.textContent = error;
+  }
+};
diff --git a/packages/launchpad-ledger/src/index.ts b/packages/launchpad-ledger/src/index.ts
new file mode 100644
index 00000000..155dfd14
--- /dev/null
+++ b/packages/launchpad-ledger/src/index.ts
@@ -0,0 +1,2 @@
+export { LaunchpadLedger } from "./launchpadledger";
+export { LedgerSigner } from "./ledgersigner";
diff --git a/packages/launchpad-ledger/src/launchpadledger.ts b/packages/launchpad-ledger/src/launchpadledger.ts
new file mode 100644
index 00000000..d781ea95
--- /dev/null
+++ b/packages/launchpad-ledger/src/launchpadledger.ts
@@ -0,0 +1,237 @@
+import { HdPath, Secp256k1Signature } from "@cosmjs/crypto";
+import { fromUtf8 } from "@cosmjs/encoding";
+import { makeCosmoshubPath } from "@cosmjs/launchpad";
+import { assert } from "@cosmjs/utils";
+import Transport from "@ledgerhq/hw-transport";
+import TransportWebUsb from "@ledgerhq/hw-transport-webusb";
+import CosmosApp, {
+  AppInfoResponse,
+  PublicKeyResponse,
+  SignResponse,
+  VersionResponse,
+} from "ledger-cosmos-js";
+import semver from "semver";
+
+/* eslint-disable @typescript-eslint/naming-convention */
+export interface LedgerAppErrorResponse {
+  readonly error_message?: string;
+  readonly device_locked?: boolean;
+}
+/* eslint-enable */
+
+const defaultInteractionTimeout = 120; // seconds to wait for user action on Ledger, currently is always limited to 60
+const requiredCosmosAppVersion = "1.5.3";
+
+function isWindows(platform: string): boolean {
+  return platform.indexOf("Win") > -1;
+}
+
+function verifyBrowserIsSupported(platform: string, userAgent: string): void {
+  if (isWindows(platform)) {
+    throw new Error("Windows is not currently supported.");
+  }
+
+  const isChromeOrBrave = /chrome|crios/i.test(userAgent) && !/edge|opr\//i.test(userAgent);
+  if (!isChromeOrBrave) {
+    throw new Error("Your browser does not support Ledger devices.");
+  }
+}
+
+async function createTransport(timeout: number): Promise<Transport> {
+  try {
+    const transport = await TransportWebUsb.create(timeout * 1000);
+    return transport;
+  } catch (error) {
+    const trimmedErrorMessage = error.message.trim();
+    if (trimmedErrorMessage.startsWith("No WebUSB interface found for your Ledger device")) {
+      throw new Error(
+        "Could not connect to a Ledger device. Please use Ledger Live to upgrade the Ledger firmware to version 1.5.5 or later.",
+      );
+    }
+    if (trimmedErrorMessage.startsWith("Unable to claim interface")) {
+      throw new Error("Could not access Ledger device. Is it being used in another tab?");
+    }
+    if (trimmedErrorMessage.startsWith("Not supported")) {
+      throw new Error(
+        "Your browser does not seem to support WebUSB yet. Try updating it to the latest version.",
+      );
+    }
+    if (trimmedErrorMessage.startsWith("No device selected")) {
+      throw new Error(
+        "You did not select a Ledger device. If you did not see your Ledger, check if the Ledger is plugged in and unlocked.",
+      );
+    }
+
+    throw error;
+  }
+}
+
+function unharden(hdPath: HdPath): number[] {
+  return hdPath.map((n) => (n.isHardened() ? n.toNumber() - 2 ** 31 : n.toNumber()));
+}
+
+const cosmosHdPath = makeCosmoshubPath(0);
+const cosmosBech32Prefix = "cosmos";
+
+export interface LaunchpadLedgerOptions {
+  readonly hdPaths?: readonly HdPath[];
+  readonly prefix?: string;
+  readonly testModeAllowed?: boolean;
+}
+
+export class LaunchpadLedger {
+  private readonly testModeAllowed: boolean;
+  private readonly hdPaths: readonly HdPath[];
+  private readonly prefix: string;
+  private cosmosApp: CosmosApp | null;
+  public readonly platform: string;
+  public readonly userAgent: string;
+
+  constructor(options: LaunchpadLedgerOptions = {}) {
+    const defaultOptions = {
+      hdPaths: [cosmosHdPath],
+      prefix: cosmosBech32Prefix,
+      testModeAllowed: false,
+    };
+    const { hdPaths, prefix, testModeAllowed } = {
+      ...defaultOptions,
+      ...options,
+    };
+    this.testModeAllowed = testModeAllowed;
+    this.hdPaths = hdPaths;
+    this.prefix = prefix;
+    this.cosmosApp = null;
+    this.platform = navigator.platform;
+    this.userAgent = navigator.userAgent;
+  }
+
+  async connect(timeout = defaultInteractionTimeout): Promise<LaunchpadLedger> {
+    // assume good connection if connected once
+    if (this.cosmosApp) {
+      return this;
+    }
+
+    verifyBrowserIsSupported(this.platform, this.userAgent);
+
+    const transport = await createTransport(timeout * 1000);
+    this.cosmosApp = new CosmosApp(transport);
+
+    await this.verifyDeviceIsReady();
+    return this;
+  }
+
+  async getCosmosAppVersion(): Promise<string> {
+    await this.connect();
+    assert(this.cosmosApp, "Cosmos Ledger App is not connected");
+
+    const response = await this.cosmosApp.getVersion();
+    this.handleLedgerErrors(response);
+    // eslint-disable-next-line @typescript-eslint/naming-convention
+    const { major, minor, patch, test_mode: testMode } = response as VersionResponse;
+    this.verifyAppMode(testMode);
+    return `${major}.${minor}.${patch}`;
+  }
+
+  async getPubkey(hdPath?: HdPath): Promise<Uint8Array> {
+    await this.connect();
+    assert(this.cosmosApp, "Cosmos Ledger App is not connected");
+
+    const hdPathToUse = hdPath || this.hdPaths[0];
+    // ledger-cosmos-js hardens the first three indices
+    const response = await this.cosmosApp.publicKey(unharden(hdPathToUse));
+    this.handleLedgerErrors(response);
+    return Uint8Array.from((response as PublicKeyResponse).compressed_pk);
+  }
+
+  async getPubkeys(): Promise<readonly Uint8Array[]> {
+    return Promise.all(this.hdPaths.map(async (hdPath) => this.getPubkey(hdPath)));
+  }
+
+  async getCosmosAddress(pubkey?: Uint8Array): Promise<string> {
+    const pubkeyToUse = pubkey || (await this.getPubkey());
+    return CosmosApp.getBech32FromPK(this.prefix, Buffer.from(pubkeyToUse));
+  }
+
+  async sign(message: Uint8Array, hdPath?: HdPath): Promise<Uint8Array> {
+    await this.connect();
+    assert(this.cosmosApp, "Cosmos Ledger App is not connected");
+
+    const hdPathToUse = hdPath || this.hdPaths[0];
+    // ledger-cosmos-js hardens the first three indices
+    const response = await this.cosmosApp.sign(unharden(hdPathToUse), fromUtf8(message));
+    this.handleLedgerErrors(response, "Transaction signing request was rejected by the user");
+    return Secp256k1Signature.fromDer((response as SignResponse).signature).toFixedLength();
+  }
+
+  private verifyAppMode(testMode: boolean): void {
+    if (testMode && !this.testModeAllowed) {
+      throw new Error(`DANGER: The Cosmos Ledger app is in test mode and should not be used on mainnet!`);
+    }
+  }
+
+  private async getOpenAppName(): Promise<string> {
+    await this.connect();
+    assert(this.cosmosApp, "Cosmos Ledger App is not connected");
+
+    const response = await this.cosmosApp.appInfo();
+    this.handleLedgerErrors(response);
+    return (response as AppInfoResponse).appName;
+  }
+
+  private async verifyAppVersion(): Promise<void> {
+    const version = await this.getCosmosAppVersion();
+    if (!semver.gte(version, requiredCosmosAppVersion)) {
+      throw new Error("Outdated version: Please update Cosmos Ledger App to the latest version.");
+    }
+  }
+
+  private async verifyCosmosAppIsOpen(): Promise<void> {
+    const appName = await this.getOpenAppName();
+
+    if (appName.toLowerCase() === `dashboard`) {
+      throw new Error(`Please open the Cosmos Ledger app on your Ledger device.`);
+    }
+    if (appName.toLowerCase() !== `cosmos`) {
+      throw new Error(`Please close ${appName} and open the Cosmos Ledger app on your Ledger device.`);
+    }
+  }
+
+  private async verifyDeviceIsReady(): Promise<void> {
+    await this.verifyAppVersion();
+    await this.verifyCosmosAppIsOpen();
+  }
+
+  private handleLedgerErrors(
+    /* eslint-disable @typescript-eslint/naming-convention */
+    {
+      error_message: errorMessage = "No errors",
+      device_locked: deviceLocked = false,
+    }: LedgerAppErrorResponse,
+    /* eslint-enable */
+    rejectionMessage = "Request was rejected by the user",
+  ): void {
+    if (deviceLocked) {
+      throw new Error("Ledger’s screensaver mode is on");
+    }
+    switch (errorMessage) {
+      case "U2F: Timeout":
+        throw new Error("Connection timed out. Please try again.");
+      case "Cosmos app does not seem to be open":
+        throw new Error("Cosmos app is not open");
+      case "Command not allowed":
+        throw new Error("Transaction rejected");
+      case "Transaction rejected":
+        throw new Error(rejectionMessage);
+      case "Unknown Status Code: 26628":
+        throw new Error("Ledger’s screensaver mode is on");
+      case "Instruction not supported":
+        throw new Error(
+          `Your Cosmos Ledger App is not up to date. Please update to version ${requiredCosmosAppVersion}.`,
+        );
+      case "No errors":
+        break;
+      default:
+        throw new Error(`Ledger Native Error: ${errorMessage}`);
+    }
+  }
+}
diff --git a/packages/launchpad-ledger/src/ledgersigner.ts b/packages/launchpad-ledger/src/ledgersigner.ts
new file mode 100644
index 00000000..836c7480
--- /dev/null
+++ b/packages/launchpad-ledger/src/ledgersigner.ts
@@ -0,0 +1,43 @@
+import { AccountData, encodeSecp256k1Signature, OfflineSigner, StdSignature } from "@cosmjs/launchpad";
+
+import { LaunchpadLedger, LaunchpadLedgerOptions } from "./launchpadledger";
+
+export class LedgerSigner implements OfflineSigner {
+  private readonly ledger: LaunchpadLedger;
+  private accounts?: readonly AccountData[];
+
+  constructor(options?: LaunchpadLedgerOptions) {
+    this.ledger = new LaunchpadLedger(options);
+  }
+
+  public async getAccounts(): Promise<readonly AccountData[]> {
+    await this.ledger.connect();
+
+    if (!this.accounts) {
+      const pubkeys = await this.ledger.getPubkeys();
+      this.accounts = await Promise.all(
+        pubkeys.map(async (pubkey) => ({
+          algo: "secp256k1" as const,
+          address: await this.ledger.getCosmosAddress(pubkey),
+          pubkey: pubkey,
+        })),
+      );
+    }
+
+    return this.accounts;
+  }
+
+  public async sign(address: string, message: Uint8Array): Promise<StdSignature> {
+    await this.ledger.connect();
+
+    const accounts = this.accounts || (await this.getAccounts());
+    const accountForAddress = accounts.find((account) => account.address === address);
+
+    if (!accountForAddress) {
+      throw new Error(`Address ${address} not found in wallet`);
+    }
+
+    const signature = await this.ledger.sign(message);
+    return encodeSecp256k1Signature(accountForAddress.pubkey, signature);
+  }
+}
diff --git a/packages/launchpad-ledger/tsconfig.json b/packages/launchpad-ledger/tsconfig.json
new file mode 100644
index 00000000..44242629
--- /dev/null
+++ b/packages/launchpad-ledger/tsconfig.json
@@ -0,0 +1,11 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "baseUrl": ".",
+    "outDir": "build",
+    "declarationDir": "build/types",
+    "rootDir": "src",
+    "lib": ["es2017", "dom"]
+  },
+  "include": ["src/**/*", "./custom_types/*"]
+}
diff --git a/packages/launchpad-ledger/typedoc.js b/packages/launchpad-ledger/typedoc.js
new file mode 100644
index 00000000..3b3d649e
--- /dev/null
+++ b/packages/launchpad-ledger/typedoc.js
@@ -0,0 +1,13 @@
+const packageJson = require("./package.json");
+
+module.exports = {
+  inputFiles: ["./src"],
+  out: "docs",
+  exclude: ["**/*.spec.ts", "./src/demo"],
+  name: `${packageJson.name} Documentation`,
+  readme: "README.md",
+  mode: "file",
+  excludeExternals: true,
+  excludeNotExported: true,
+  excludePrivate: true,
+};
diff --git a/packages/launchpad-ledger/types/index.d.ts b/packages/launchpad-ledger/types/index.d.ts
new file mode 100644
index 00000000..155dfd14
--- /dev/null
+++ b/packages/launchpad-ledger/types/index.d.ts
@@ -0,0 +1,2 @@
+export { LaunchpadLedger } from "./launchpadledger";
+export { LedgerSigner } from "./ledgersigner";
diff --git a/packages/launchpad-ledger/types/launchpadledger.d.ts b/packages/launchpad-ledger/types/launchpadledger.d.ts
new file mode 100644
index 00000000..6eda113d
--- /dev/null
+++ b/packages/launchpad-ledger/types/launchpadledger.d.ts
@@ -0,0 +1,31 @@
+import { HdPath } from "@cosmjs/crypto";
+export interface LedgerAppErrorResponse {
+  readonly error_message?: string;
+  readonly device_locked?: boolean;
+}
+export interface LaunchpadLedgerOptions {
+  readonly hdPaths?: readonly HdPath[];
+  readonly prefix?: string;
+  readonly testModeAllowed?: boolean;
+}
+export declare class LaunchpadLedger {
+  private readonly testModeAllowed;
+  private readonly hdPaths;
+  private readonly prefix;
+  private cosmosApp;
+  readonly platform: string;
+  readonly userAgent: string;
+  constructor(options?: LaunchpadLedgerOptions);
+  connect(timeout?: number): Promise<LaunchpadLedger>;
+  getCosmosAppVersion(): Promise<string>;
+  getPubkey(hdPath?: HdPath): Promise<Uint8Array>;
+  getPubkeys(): Promise<readonly Uint8Array[]>;
+  getCosmosAddress(pubkey?: Uint8Array): Promise<string>;
+  sign(message: Uint8Array, hdPath?: HdPath): Promise<Uint8Array>;
+  private verifyAppMode;
+  private getOpenAppName;
+  private verifyAppVersion;
+  private verifyCosmosAppIsOpen;
+  private verifyDeviceIsReady;
+  private handleLedgerErrors;
+}
diff --git a/packages/launchpad-ledger/types/ledgersigner.d.ts b/packages/launchpad-ledger/types/ledgersigner.d.ts
new file mode 100644
index 00000000..dc4c4e49
--- /dev/null
+++ b/packages/launchpad-ledger/types/ledgersigner.d.ts
@@ -0,0 +1,9 @@
+import { AccountData, OfflineSigner, StdSignature } from "@cosmjs/launchpad";
+import { LaunchpadLedgerOptions } from "./launchpadledger";
+export declare class LedgerSigner implements OfflineSigner {
+  private readonly ledger;
+  private accounts?;
+  constructor(options?: LaunchpadLedgerOptions);
+  getAccounts(): Promise<readonly AccountData[]>;
+  sign(address: string, message: Uint8Array): Promise<StdSignature>;
+}
diff --git a/packages/launchpad-ledger/webpack.demo.config.js b/packages/launchpad-ledger/webpack.demo.config.js
new file mode 100644
index 00000000..e16bea23
--- /dev/null
+++ b/packages/launchpad-ledger/webpack.demo.config.js
@@ -0,0 +1,17 @@
+const glob = require("glob");
+const path = require("path");
+
+const target = "web";
+const demodir = path.join(__dirname, "dist", "demo");
+
+module.exports = [
+  {
+    // bundle used for Ledger demo
+    target: target,
+    entry: glob.sync("./build/demo/index.js"),
+    output: {
+      path: demodir,
+      filename: "ledger.js",
+    },
+  },
+];
diff --git a/packages/launchpad/src/secp256k1wallet.ts b/packages/launchpad/src/secp256k1wallet.ts
index 6c393cfa..5f5aea9a 100644
--- a/packages/launchpad/src/secp256k1wallet.ts
+++ b/packages/launchpad/src/secp256k1wallet.ts
@@ -1,12 +1,12 @@
 import {
   Bip39,
   EnglishMnemonic,
+  HdPath,
   pathToString,
   Random,
   Secp256k1,
   Slip10,
   Slip10Curve,
-  Slip10RawIndex,
   stringToPath,
 } from "@cosmjs/crypto";
 import { fromBase64, fromUtf8, toBase64, toUtf8 } from "@cosmjs/encoding";
@@ -104,7 +104,7 @@ export function extractKdfConfiguration(serialization: string): KdfConfiguration
  * Derivation information required to derive a keypair and an address from a mnemonic.
  */
 interface Secp256k1Derivation {
-  readonly hdPath: readonly Slip10RawIndex[];
+  readonly hdPath: HdPath;
   readonly prefix: string;
 }
 
@@ -118,7 +118,7 @@ export class Secp256k1Wallet implements OfflineSigner {
    */
   public static async fromMnemonic(
     mnemonic: string,
-    hdPath: readonly Slip10RawIndex[] = makeCosmoshubPath(0),
+    hdPath: HdPath = makeCosmoshubPath(0),
     prefix = "cosmos",
   ): Promise<Secp256k1Wallet> {
     const mnemonicChecked = new EnglishMnemonic(mnemonic);
@@ -143,7 +143,7 @@ export class Secp256k1Wallet implements OfflineSigner {
    */
   public static async generate(
     length: 12 | 15 | 18 | 21 | 24 = 12,
-    hdPath: readonly Slip10RawIndex[] = makeCosmoshubPath(0),
+    hdPath: HdPath = makeCosmoshubPath(0),
     prefix = "cosmos",
   ): Promise<Secp256k1Wallet> {
     const entropyLength = 4 * Math.floor((11 * length) / 33);
@@ -223,7 +223,7 @@ export class Secp256k1Wallet implements OfflineSigner {
 
   private constructor(
     mnemonic: EnglishMnemonic,
-    hdPath: readonly Slip10RawIndex[],
+    hdPath: HdPath,
     privkey: Uint8Array,
     pubkey: Uint8Array,
     prefix: string,
diff --git a/packages/launchpad/src/wallet.ts b/packages/launchpad/src/wallet.ts
index f8e4b1ab..eaded173 100644
--- a/packages/launchpad/src/wallet.ts
+++ b/packages/launchpad/src/wallet.ts
@@ -1,5 +1,6 @@
 import {
   Argon2id,
+  HdPath,
   isArgon2idOptions,
   Random,
   Sha256,
@@ -52,7 +53,7 @@ export function prehash(bytes: Uint8Array, type: PrehashType): Uint8Array {
  * The Cosmoshub derivation path in the form `m/44'/118'/0'/0/a`
  * with 0-based account index `a`.
  */
-export function makeCosmoshubPath(a: number): readonly Slip10RawIndex[] {
+export function makeCosmoshubPath(a: number): HdPath {
   return [
     Slip10RawIndex.hardened(44),
     Slip10RawIndex.hardened(118),
diff --git a/packages/launchpad/types/secp256k1wallet.d.ts b/packages/launchpad/types/secp256k1wallet.d.ts
index 06e9510c..a24a3366 100644
--- a/packages/launchpad/types/secp256k1wallet.d.ts
+++ b/packages/launchpad/types/secp256k1wallet.d.ts
@@ -1,4 +1,4 @@
-import { Slip10RawIndex } from "@cosmjs/crypto";
+import { HdPath } from "@cosmjs/crypto";
 import { StdSignature } from "./types";
 import { AccountData, EncryptionConfiguration, KdfConfiguration, OfflineSigner, PrehashType } from "./wallet";
 /**
@@ -40,11 +40,7 @@ export declare class Secp256k1Wallet implements OfflineSigner {
    * @param hdPath The BIP-32/SLIP-10 derivation path. Defaults to the Cosmos Hub/ATOM path `m/44'/118'/0'/0/0`.
    * @param prefix The bech32 address prefix (human readable part). Defaults to "cosmos".
    */
-  static fromMnemonic(
-    mnemonic: string,
-    hdPath?: readonly Slip10RawIndex[],
-    prefix?: string,
-  ): Promise<Secp256k1Wallet>;
+  static fromMnemonic(mnemonic: string, hdPath?: HdPath, prefix?: string): Promise<Secp256k1Wallet>;
   /**
    * Generates a new wallet with a BIP39 mnemonic of the given length.
    *
@@ -54,7 +50,7 @@ export declare class Secp256k1Wallet implements OfflineSigner {
    */
   static generate(
     length?: 12 | 15 | 18 | 21 | 24,
-    hdPath?: readonly Slip10RawIndex[],
+    hdPath?: HdPath,
     prefix?: string,
   ): Promise<Secp256k1Wallet>;
   /**
diff --git a/packages/launchpad/types/wallet.d.ts b/packages/launchpad/types/wallet.d.ts
index c0818ef2..5c284f5d 100644
--- a/packages/launchpad/types/wallet.d.ts
+++ b/packages/launchpad/types/wallet.d.ts
@@ -1,4 +1,4 @@
-import { Slip10RawIndex } from "@cosmjs/crypto";
+import { HdPath } from "@cosmjs/crypto";
 import { StdSignature } from "./types";
 export declare type PrehashType = "sha256" | "sha512" | null;
 export declare type Algo = "secp256k1" | "ed25519" | "sr25519";
@@ -22,7 +22,7 @@ export declare function prehash(bytes: Uint8Array, type: PrehashType): Uint8Arra
  * The Cosmoshub derivation path in the form `m/44'/118'/0'/0/a`
  * with 0-based account index `a`.
  */
-export declare function makeCosmoshubPath(a: number): readonly Slip10RawIndex[];
+export declare function makeCosmoshubPath(a: number): HdPath;
 /**
  * A fixed salt is chosen to archive a deterministic password to key derivation.
  * This reduces the scope of a potential rainbow attack to all CosmJS users.
diff --git a/tsconfig.json b/tsconfig.json
index 7817c12b..b74563e3 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -4,6 +4,7 @@
     "declaration": true,
     "esModuleInterop": true,
     "forceConsistentCasingInFileNames": true,
+    "lib": ["es2017"],
     "module": "commonjs",
     "moduleResolution": "node",
     "newLine": "LF",
@@ -17,7 +18,6 @@
     "resolveJsonModule": true,
     "sourceMap": true,
     "strict": true,
-    "target": "es2017",
-    "lib": ["es2017"]
+    "target": "es2017"
   }
 }
diff --git a/yarn.lock b/yarn.lock
index cca65fc2..c0c33ea5 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -144,6 +144,13 @@
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.10.3.tgz#7e71d892b0d6e7d04a1af4c3c79d72c1f10f5315"
   integrity sha512-oJtNJCMFdIMwXGmx+KxuaD7i3b8uS7TTFYW/FNG2BT8m+fmGHoiPYoH0Pe3gya07WuFmM5FCDIr1x0irkD/hyA==
 
+"@babel/runtime@^7.7.4":
+  version "7.11.2"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.11.2.tgz#f549c13c754cc40b87644b9fa9f09a6a95fe0736"
+  integrity sha512-TeWkU52so0mPtDcaCTxNBI/IHiz0pZgr8VEFqXFtZWpYD08ZB6FaSwVAS8MKRQAP3bYKiVjwysOJgMFY28o6Tw==
+  dependencies:
+    regenerator-runtime "^0.13.4"
+
 "@babel/template@^7.10.1", "@babel/template@^7.10.3":
   version "7.10.3"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.10.3.tgz#4d13bc8e30bf95b0ce9d175d30306f42a2c9a7b8"
@@ -290,6 +297,72 @@
   dependencies:
     vary "^1.1.2"
 
+"@ledgerhq/devices@^4.78.0":
+  version "4.78.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/devices/-/devices-4.78.0.tgz#149b572f0616096e2bd5eb14ce14d0061c432be6"
+  integrity sha512-tWKS5WM/UU82czihnVjRwz9SXNTQzWjGJ/7+j/xZ70O86nlnGJ1aaFbs5/WTzfrVKpOKgj1ZoZkAswX67i/JTw==
+  dependencies:
+    "@ledgerhq/errors" "^4.78.0"
+    "@ledgerhq/logs" "^4.72.0"
+    rxjs "^6.5.3"
+
+"@ledgerhq/devices@^5.23.0":
+  version "5.23.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/devices/-/devices-5.23.0.tgz#e5b800de858e45d247be56708c832c1e51727fe0"
+  integrity sha512-XR9qTwn14WwN8VSMsYD9NTX/TgkmrTnXEh0pIj6HMRZwFzBPzslExOcXuCm3V9ssgAEAxv3VevfV8UulvvZUXA==
+  dependencies:
+    "@ledgerhq/errors" "^5.23.0"
+    "@ledgerhq/logs" "^5.23.0"
+    rxjs "^6.6.3"
+
+"@ledgerhq/errors@^4.78.0":
+  version "4.78.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/errors/-/errors-4.78.0.tgz#23daf3af54d03b1bda3e616002b555da1bdb705a"
+  integrity sha512-FX6zHZeiNtegBvXabK6M5dJ+8OV8kQGGaGtuXDeK/Ss5EmG4Ltxc6Lnhe8hiHpm9pCHtktOsnUVL7IFBdHhYUg==
+
+"@ledgerhq/errors@^5.23.0":
+  version "5.23.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/errors/-/errors-5.23.0.tgz#30a0338dafba8264556011604abed08bf24979f3"
+  integrity sha512-qtpX8aFrUUlYfOMu7BxTvxqUa8CniE+tEBpVEjYUhVbFdVJjM4ouwJD++RtQkMAU2c5jE7xb12WnUnf5BlAgLQ==
+
+"@ledgerhq/hw-transport-webusb@^5.23.0":
+  version "5.23.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/hw-transport-webusb/-/hw-transport-webusb-5.23.0.tgz#f374415ab1bda6ba55898c0e74097f2005fd06f7"
+  integrity sha512-kz0LhlxvE97gIU0TvvzY3Co4DsRudwXoWZ/RCW3/ewn4zJ5ZT/fvp9qCrqbRsXJ+RTuZ7JQOiR1kA+Iz3qJWCg==
+  dependencies:
+    "@ledgerhq/devices" "^5.23.0"
+    "@ledgerhq/errors" "^5.23.0"
+    "@ledgerhq/hw-transport" "^5.23.0"
+    "@ledgerhq/logs" "^5.23.0"
+
+"@ledgerhq/hw-transport@^4.77.0":
+  version "4.78.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/hw-transport/-/hw-transport-4.78.0.tgz#714786658e1f2fbc0569e06e2abf8d15d310d931"
+  integrity sha512-xQu16OMPQjFYLjqCysij+8sXtdWv2YLxPrB6FoLvEWGTlQ7yL1nUBRQyzyQtWIYqZd4THQowQmzm1VjxuN6SZw==
+  dependencies:
+    "@ledgerhq/devices" "^4.78.0"
+    "@ledgerhq/errors" "^4.78.0"
+    events "^3.0.0"
+
+"@ledgerhq/hw-transport@^5.23.0":
+  version "5.23.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/hw-transport/-/hw-transport-5.23.0.tgz#ed3445b9579c43a58cd959610ad7e464b36b87ca"
+  integrity sha512-ICTG3Bst62SkC+lYYFgpKk5G4bAOxeIvptXnTLOhf6VqeN7gdHfiRzZwNPnKzI2pxmcEVbBitgsxEIEQJmDKVA==
+  dependencies:
+    "@ledgerhq/devices" "^5.23.0"
+    "@ledgerhq/errors" "^5.23.0"
+    events "^3.2.0"
+
+"@ledgerhq/logs@^4.72.0":
+  version "4.72.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/logs/-/logs-4.72.0.tgz#43df23af013ad1135407e5cf33ca6e4c4c7708d5"
+  integrity sha512-o+TYF8vBcyySRsb2kqBDv/KMeme8a2nwWoG+lAWzbDmWfb2/MrVWYCVYDYvjXdSoI/Cujqy1i0gIDrkdxa9chA==
+
+"@ledgerhq/logs@^5.23.0":
+  version "5.23.0"
+  resolved "https://registry.yarnpkg.com/@ledgerhq/logs/-/logs-5.23.0.tgz#7a86b1e6479c8aa8e8b9affe00eb8e369efdbc3b"
+  integrity sha512-88M8RkVHl44k6MAhfrYhx25opnJV24/2XpuTUVklID11f9rBdE+6RZ9OMs39dyX2sDv7TuzIPi5nTRoCqZMDYw==
+
 "@lerna/add@3.21.0":
   version "3.21.0"
   resolved "https://registry.yarnpkg.com/@lerna/add/-/add-3.21.0.tgz#27007bde71cc7b0a2969ab3c2f0ae41578b4577b"
@@ -1301,6 +1374,21 @@
   dependencies:
     "@types/koa" "*"
 
+"@types/ledgerhq__hw-transport-webusb@^4.70.0":
+  version "4.70.0"
+  resolved "https://registry.yarnpkg.com/@types/ledgerhq__hw-transport-webusb/-/ledgerhq__hw-transport-webusb-4.70.0.tgz#8e03b1f8bec52a8291ef41b00470b07f28285788"
+  integrity sha512-7YY+q85pwZfja9foc0RxmcgMwsxbBo9u/Qe9BFg0uKVcF6TZFcBT99+AHWj+40EmXL3BxzK3QB+aoSNed+v8Gg==
+  dependencies:
+    "@types/ledgerhq__hw-transport" "*"
+    "@types/node" "*"
+
+"@types/ledgerhq__hw-transport@*":
+  version "4.21.2"
+  resolved "https://registry.yarnpkg.com/@types/ledgerhq__hw-transport/-/ledgerhq__hw-transport-4.21.2.tgz#92eaea9e4669df2c8ec5292b694097d1629b05c1"
+  integrity sha512-NhJwkdxdsqj/ZTq9KuBYtN+rDYOVYrlR3ByYNfK78iUOIlmXcXFBtfkhBUpX8c7dbE5uJZOjDdM3EC7Kf3Fakg==
+  dependencies:
+    "@types/node" "*"
+
 "@types/libsodium-wrappers@^0.7.7":
   version "0.7.7"
   resolved "https://registry.yarnpkg.com/@types/libsodium-wrappers/-/libsodium-wrappers-0.7.7.tgz#cdb25e85458612ec80f0157c3815fac187d0b6d2"
@@ -1370,6 +1458,11 @@
   dependencies:
     "@types/node" "*"
 
+"@types/semver@^7.3.3":
+  version "7.3.3"
+  resolved "https://registry.yarnpkg.com/@types/semver/-/semver-7.3.3.tgz#3ad6ed949e7487e7bda6f886b4a2434a2c3d7b1a"
+  integrity sha512-jQxClWFzv9IXdLdhSaTf16XI3NYe6zrEbckSpb5xhKfPbWgIyAY0AFyWWWfaiDcBuj3UHmMkCIwSRqpKMTZL2Q==
+
 "@types/serve-static@*":
   version "1.13.3"
   resolved "https://registry.yarnpkg.com/@types/serve-static/-/serve-static-1.13.3.tgz#eb7e1c41c4468272557e897e9171ded5e2ded9d1"
@@ -2051,7 +2144,7 @@ bcrypt-pbkdf@^1.0.0:
   dependencies:
     tweetnacl "^0.14.3"
 
-bech32@^1.1.4:
+bech32@^1.1.3, bech32@^1.1.4:
   version "1.1.4"
   resolved "https://registry.yarnpkg.com/bech32/-/bech32-1.1.4.tgz#e38c9f37bf179b8eb16ae3a772b40c356d4832e9"
   integrity sha512-s0IrSOzLlbvX7yp4WBfPITzpAU8sqQcpsmwXDiKwrG4r491vwCO/XpejasRNl0piBMe/DvP4Tz0mIS/X1DPJBQ==
@@ -3660,6 +3753,11 @@ events@^3.0.0:
   resolved "https://registry.yarnpkg.com/events/-/events-3.1.0.tgz#84279af1b34cb75aa88bf5ff291f6d0bd9b31a59"
   integrity sha512-Rv+u8MLHNOdMjTAFeT3nCjHn2aGlx435FP/sDHNaRhDEMwyI/aB22Kj2qIN8R0cw3z28psEQLYwxVKLsKrMgWg==
 
+events@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/events/-/events-3.2.0.tgz#93b87c18f8efcd4202a461aec4dfc0556b639379"
+  integrity sha512-/46HWwbfCX2xTawVfkKLGxMifJYQBWMwY1mjywRtb4c9x8l5NP3KoJtnIOiL1hfdRkIuYhETxQlo62IF8tcnlg==
+
 evp_bytestokey@^1.0.0, evp_bytestokey@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/evp_bytestokey/-/evp_bytestokey-1.0.3.tgz#7fcbdb198dc71959432efe13842684e0525acb02"
@@ -5304,6 +5402,16 @@ koa@^2.11.0:
     type-is "^1.6.16"
     vary "^1.1.2"
 
+ledger-cosmos-js@^2.1.7:
+  version "2.1.7"
+  resolved "https://registry.yarnpkg.com/ledger-cosmos-js/-/ledger-cosmos-js-2.1.7.tgz#362d1139ac2504ccb56029abda053b2c5b290e8d"
+  integrity sha512-RyaP+6lRhllQTgk5X14PiZtsUE8bYP7mOiFkOMAzPQvUDdy8IZr17mDaH9whqHtE0wZd95YPN89VAhbfV+Re8w==
+  dependencies:
+    "@babel/runtime" "^7.7.4"
+    "@ledgerhq/hw-transport" "^4.77.0"
+    bech32 "^1.1.3"
+    ripemd160 "^2.0.2"
+
 lerna@^3.22.1:
   version "3.22.1"
   resolved "https://registry.yarnpkg.com/lerna/-/lerna-3.22.1.tgz#82027ac3da9c627fd8bf02ccfeff806a98e65b62"
@@ -7134,6 +7242,11 @@ redent@^3.0.0:
     indent-string "^4.0.0"
     strip-indent "^3.0.0"
 
+regenerator-runtime@^0.13.4:
+  version "0.13.7"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.13.7.tgz#cac2dacc8a1ea675feaabaeb8ae833898ae46f55"
+  integrity sha512-a54FxoJDIr27pgf7IgeQGxmqUNYrcV338lf/6gH456HZ/PhX+5BcwHXG9ajESmwe6WRO0tAzRUrRmNONWgkrew==
+
 regex-not@^1.0.0, regex-not@^1.0.2:
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/regex-not/-/regex-not-1.0.2.tgz#1f4ece27e00b0b65e0247a6810e6a85d83a5752c"
@@ -7332,6 +7445,13 @@ rxjs@^6.4.0:
   dependencies:
     tslib "^1.9.0"
 
+rxjs@^6.5.3, rxjs@^6.6.3:
+  version "6.6.3"
+  resolved "https://registry.yarnpkg.com/rxjs/-/rxjs-6.6.3.tgz#8ca84635c4daa900c0d3967a6ee7ac60271ee552"
+  integrity sha512-trsQc+xYYXZ3urjOiJOuCOa5N3jAZ3eiSpQB5hIT8zGlL2QfnHLJ2r7GMkBGuIausdJN1OneaI6gQlsqNHHmZQ==
+  dependencies:
+    tslib "^1.9.0"
+
 safe-buffer@5.1.2, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
   version "5.1.2"
   resolved "https://registry.yarnpkg.com/safe-buffer/-/safe-buffer-5.1.2.tgz#991ec69d296e0313747d59bdfd2b745c35f8828d"