@sei-js/ledger

Table of Contents

• Installation
• Usage
• createTransportAndApp
  • Parameters
• getAddresses
  • Parameters
• SeiLedgerOfflineAminoSigner
  • Constructor
  • getAccounts
  • signAmino
• removeLeadingZeros
  • Parameters

Installation

yarn add @sei-js/ledger
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Example Usage

import {
  coins,
  SigningStargateClient,
  StdFee
} from "@cosmjs/stargate";

import {
  createTransportAndApp,
  getAddresses,
  SeiLedgerOfflineAminoSigner
} from "@sei-js/ledger";

const testApp = async () => {
  const validatorAddress = "seivaloper1sq7x0r2mf3gvwr2l9amtlye0yd3c6dqa4th95v";
  const rpcUrl = "https://rpc-testnet.sei-apis.com/";
  const memo = "Delegation";
  const path = "m/44'/60'/0'/0/0";

  const {app} = await createTransportAndApp();
  const {nativeAddress} = await getAddresses(app, path);
  const ledgerSigner = new SeiLedgerOfflineAminoSigner(app, path)
  const signingStargateClient = await SigningStargateClient.connectWithSigner(rpcUrl, ledgerSigner)

  const msgDelegate = {
    typeUrl: "/cosmos.staking.v1beta1.MsgDelegate",
    value: {
      delegatorAddress: nativeAddress.address,
      validatorAddress: validatorAddress,
      amount: coins(500, "usei"),
    },
  };

  const fee: StdFee = {
    amount: [{denom: "usei", amount: "20000"}],
    gas: "200000",
  };

  const result = await signingStargateClient.signAndBroadcast(nativeAddress.address, [msgDelegate], fee, memo)
  console.log("Broadcast result:", result);
};

testApp();
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createTransportAndApp

Parameters:

• None.

Returns:

• Promise<{transport: Transport, app: SeiApp}>: A promise that resolves to an object containing the transport and app instances.

Usage:

import { createTransportAndApp } from '@sei-js/ledger';

const { transport, app } = await createTransportAndApp();
console.log(transport, app);
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getAddresses

Parameters:

• app (SeiApp): An instance of the Ledger Sei app.
• path (string): The HD derivation path (e.g., "m/44'/60'/0'/0/0").

Returns:

• Promise<{evmAddress: string, nativeAddress: string}>: A promise that resolves to an object containing the EVM and Cosmos addresses.

Usage:

import { getAddresses } from '@sei-js/ledger';

const { evmAddress, nativeAddress } = await getAddresses(app, "m/44'/60'/0'/0/0");
console.log(evmAddress, nativeAddress);
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SeiLedgerOfflineAminoSigner

Constructor

new SeiLedgerOfflineAminoSigner(app: SeiApp, path: string)
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Parameters:

• app (SeiApp): An instance of the Ledger Sei app.
• path (string): The HD derivation path (e.g., "m/44'/60'/0'/0/0").

Usage:

import { SeiLedgerOfflineAminoSigner } from '@sei-js/ledger';

const ledgerSigner = new SeiLedgerOfflineAminoSigner(app, "m/44'/60'/0'/0/0");
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getAccounts

Returns:

• Promise<readonly AccountData[]>: A promise that resolves to an array of AccountData objects containing the address and public key.

Usage:

import { SeiLedgerOfflineAminoSigner } from '@sei-js/ledger';

const accounts = await ledgerSigner.getAccounts();
console.log(accounts); // { address: 'sei1...', pubkey: { type: 'tendermint/PubKeySecp256k1', value: '...' } }
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signAmino

Parameters:

• _signerAddress (string): The address of the signer (unused in this method).
• signDoc (StdSignDoc): The sign document to be signed.

Returns:

• Promise<AminoSignResponse>: A promise that resolves to an object containing the signed document and the signature.

Usage:

import { SeiLedgerOfflineAminoSigner } from '@sei-js/ledger';
import { StdSignDoc } from '@cosmjs/amino';

const signDoc: StdSignDoc = { /* your StdSignDoc object */ };
const signResponse = await ledgerSigner.signAmino('sei123...', signDoc);
console.log(signResponse.signed, signResponse.signature);
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