How to generate thousands of wallets out of a mnemonic phrase?

Question

I have this code which generates a single wallet:

const ethers = require('ethers')
const wallet = ethers.Wallet.createRandom()console.log('address:', wallet.address)
console.log('mnemonic:', wallet.mnemonic.phrase)
console.log('privateKey:', wallet.privateKey)

What I need, however, is thousands of wallets and private keys to each one, generated out of this mnemonic. How to do it?

Answer 1

To generate multiple wallets from a mnemonic, you can use the HDNode class from the ethers library. Here is an example of how you could generate multiple wallets from a mnemonic:

const ethers = require('ethers')

// Create a random mnemonic to use as the seed for the HDNode
const mnemonic = ethers.utils.HDNode.entropyToMnemonic(ethers.utils.randomBytes(16))

// Use the mnemonic to create an HDNode instance
const node = ethers.utils.HDNode.fromMnemonic(mnemonic)

// Generate multiple wallets from the HDNode instance
const wallets = []
for (let i = 0; i < 1000; i++) {
  const path = "m/44'/60'/0'/0/" + i
  const wallet = node.derivePath(path).getWallet()
  wallets.push(wallet)
}

In this example, wallets is an array of 1000 Wallet instances, each with a different address and private key. You can access the address, mnemonic, and private key for each wallet using the address, mnemonic, and privateKey properties, respectively.

// Print the address, mnemonic, and private key for each wallet
for (const wallet of wallets) {
  console.log('address:', wallet.address)
  console.log('mnemonic:', wallet.mnemonic.phrase)
  console.log('privateKey:', wallet.privateKey)
}

Recovering wallet from mnemonic:

const ethers = require('ethers')

// The mnemonic phrase for the wallet
const mnemonic = 'candy maple cake sugar pudding cream honey rich smooth crumble sweet treat'

// The path of the wallet
const path = "m/44'/60'/0'/0/0"

// Create a root HDNode from the mnemonic phrase
const root = ethers.HDNode.fromMnemonic(mnemonic)

// Derive the wallet from the root node using the given path
const wallet = root.derivePath(path)

// Print the address and private key of the recreated wallet
console.log('address:', wallet.address)
console.log('privateKey:', wallet.privateKey)