hardhat-ledger

Hardhat plugin for integration with a Ledger hardware wallet.

What

This plugin extends the Hardhat provider enabling it to work with a connected Ledger wallet seamlessly.

Installation

npm install --save-dev @nomicfoundation/hardhat-ledger

And add the following statement to your hardhat.config.js:

require("@nomicfoundation/hardhat-ledger");

Or, if you are using TypeScript, add this to your hardhat.config.ts:

import "@nomicfoundation/hardhat-ledger";

Tasks

This plugin creates no additional tasks.

Environment extensions

This plugin adds nothing to the Hardhat Runtime Environment.

Provider extensions

The provider supplied by Hardhat will be extended using extendProvider, decorating it to be a LedgerProvider. Any successive calls to extendProvider will be added on top of this.

A LedgerProvider knows how to connect and interact with a Ledger wallet

Usage

The only additional step to make this plugin work is to configure it properly through the Hardhat Config. For example, in your hardhat.config.js:

require("@nomicfoundation/hardhat-ledger");

module.exports = {
  networks: {
    hardhat: {
      ledgerAccounts: [
        "0xa809931e3b38059adae9bc5455bc567d0509ab92",
        "0xda6a52afdae5ff66aa786da68754a227331f56e3",
        "0xbc307688a80ec5ed0edc1279c44c1b34f7746bda",
      ],
    },
  },
};

This will make those three accounts available to the LedgerProvider. If you try to send a transaction or sign something using any of those accounts, the provider will try to connect to the Ledger wallet and find a derivation path for that address. By default, the derivation paths that are tried start from m/44'/60'/0'/0'/0 and go way up to m/44'/60'/20'/0'/0.

An additional (optional) configuration is possible to specify the derivation path that should be used, allowing 'legacy' or otherwise non-standard addresses to still be used with the plugin. An example of such a configuration would be:

    hardhat: {
      ledgerAccounts: [...],
      ledgerOptions: {
        derivationFunction: (x) => `m/44'/60'/0'/${x}` // legacy derivation path
      }
    }

If you want to use the provider, you could, for example in a task:

task("sign", "Signs a message", async (_, hre) => {
  const message =
    "0x5417aa2a18a44da0675524453ff108c545382f0d7e26605c56bba47c21b5e979";
  const account = "0xa809931e3b38059adae9bc5455bc567d0509ab92";

  const signature = await hre.network.provider.request({
    method: "personal_sign",
    params: [
      "0x5417aa2a18a44da0675524453ff108c545382f0d7e26605c56bba47c21b5e979",
      account,
    ],
  });

  console.log(
    "Signed message",
    message,
    "for Ledger account",
    account,
    "and got",
    signature
  );
});

Errors

The package throws and exports a few errors. In case you ever need to catch and check for them, you can use the public static method present on each of them. For example:

try {
  //(...)
} catch (error) {
  if (DerivationPathError.isDerivationPathError(error)) {
    // error is a DerivationPathError
  }
}

Same for the other errors, all have their corresponding .isXXXError() method.