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

addressesethereumjsgo-ethereum

I am working on a iOS & Android-App which is interacting with the blockchain via a Geth node behind an API. Is it possible to do the following:
1. generate an address using a package like EthereumJS
2. Sign transactions with it
3. Accept those transactions with the Geth node?

Or is it only possible to generate addresses from a Geth-Node?
Thank you!

Best Answer

  1. 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

  2. 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());

  3. To send signed transaction to geth you can use web3.eth.sendRawTransaction.

    web3.eth.sendRawTransaction('0x'+tx.serialize().toString('hex'));
Related Topic