[Ethereum] ethereumjs-wallet/hdkey is no more in npm

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how to generate multiple addresses from single mnemonic?

var hdkey = require("ethereumjs-wallet/hdkey")
var bip39 = require("bip39");

// You can generate a mnemonic seed with bip39 library
var mnemonic = "seed sock milk ";
var path = "m/44'/60'/0'/0/0";

var hdwallet = hdkey.fromMasterSeed(bip39.mnemonicToSeed(mnemonic));
var wallet = hdwallet.derivePath(path).getWallet();
var address = "0x" + wallet.getAddress().toString("hex");
console.log(address)

Best Answer

This is an old question but since no answer: the last number of the derivation path is to be changed to generate a new address: 0 is the first address, that you get with path m/44'/60'/0'/0/0, then use m/44'/60'/0'/0/1, then m/44'/60'/0'/0/2 ...

Related Solutions

[Ethereum] EthereumJS: How to get public key from private key

ethereumjs-wallet can be used to get public key from private key:

> const hdkey = require('ethereumjs-wallet/hdkey')
> const privateKey = hdkey.fromMasterSeed('random')._hdkey._privateKey
> const Wallet = require('ethereumjs-wallet')
> const wallet = Wallet.fromPrivateKey(privateKey)
> wallet.getPublicKeyString()
'0x11f2b30c9479ccaa639962e943ca7cfd3498705258ddb49dfe25bba00a555e48cb35a79f3d084ce26dbac0e6bb887463774817cb80e89b20c0990bc47f9075d5'
> wallet.getPublicKey()
<Buffer 11 f2 b3 0c 94 79 cc aa 63 99 62 e9 43 ca 7c fd 34 98 70 52 58 dd b4 9d fe 25 bb a0 0a 55 5e 48 cb 35 a7 9f 3d 08 4c e2 6d ba c0 e6 bb 88 74 63 77 48 ... >

Another option is to use ethereumjs-util (which is used by ethereumjs-wallet internally):

> const util = require('ethereumjs-util')
> util.privateToPublic(privateKey)
<Buffer 11 f2 b3 0c 94 79 cc aa 63 99 62 e9 43 ca 7c fd 34 98 70 52 58 dd b4 9d fe 25 bb a0 0a 55 5e 48 cb 35 a7 9f 3d 08 4c e2 6d ba c0 e6 bb 88 74 63 77 48 ... >

Yet another option is secp256k1:

> const secp256k1 = require('secp256k1')
> secp256k1.publicKeyCreate(privateKey, false).slice(1)
<Buffer 11 f2 b3 0c 94 79 cc aa 63 99 62 e9 43 ca 7c fd 34 98 70 52 58 dd b4 9d fe 25 bb a0 0a 55 5e 48 cb 35 a7 9f 3d 08 4c e2 6d ba c0 e6 bb 88 74 63 77 48 ... >

slice(1) is to drop type byte which is hardcoded as 04 ethereum.

[Ethereum] Is it possible to create an address using ethereumjs without a Geth node

Yes, you can use ethereumjs-wallet to create a wallet client side.

const wallet = require('ethereumjs-wallet');
const myWallet = wallet.generate();

console.log(`Address: ${myWallet.getAddressString()}`);
console.log(`Private Key: ${myWallet.getPrivateKeyString()}`)

Will output something like this:

Address: 0x31483bb3cae99bf173e5f61f0c62dc398f197b81
Private Key: 0x96d99fefd214a6cf0e401936bed52c96ddbb82b7e2d51d453ae7b85f115ae20a

You can use ethereumjs-tx to create and sign transactions.

const Transaction = require('ethereumjs-tx');

const txData = {
  nonce: '0x00',
  gasPrice: '0x04a817c800',
  gasLimit: '0x5208',
  to: '0x31483bb3cae99bf173e5f61f0c62dc398f197b81',
  value: '0x03e8',
  data: '0x',
  chainId: 3
};

const tx = new Transaction(txData);
tx.sign(myWallet.getPrivateKey());

To send signed transaction to geth you can use web3.eth.sendRawTransaction.
```
web3.eth.sendRawTransaction('0x'+tx.serialize().toString('hex'));
```

Best Answer

Related Solutions

[Ethereum] EthereumJS: How to get public key from private key

[Ethereum] Is it possible to create an address using ethereumjs without a Geth node

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