Integrate Embedded Wallets with the Flow Blockchain in Node

While using the Web3Auth Node SDK, you get a Ethers Signer on successful authentication. This signer can be used with libraries like ethers.js etc. to make Flow blockchain calls like getting the user's account, fetching balance, sign transaction, send transaction, read from and write to the smart contract, etc. We have highlighted a few here to get you started quickly on that.

Chain Details for Flow

• Mainnet
• Testnet

• Chain ID: 0x2eb
• Public RPC URL: https://mainnet.evm.nodes.onflow.org
• Display Name: Flow EVM Mainnet
• Block Explorer Link: https://evm.flowscan.io
• Ticker: FLOW
• Ticker Name: Flow

• Chain ID: 0x221
• Public RPC URL: https://testnet.evm.nodes.onflow.org
• Display Name: Flow EVM Testnet
• Block Explorer Link: https://evm-testnet.flowscan.io
• Ticker: FLOW
• Ticker Name: Flow

Installation

To interact with the blockchain, you can use either the viem or ethers.js library with Web3Auth.

• ethers.js
• viem

• npm
• Yarn
• pnpm
• Bun

npm install --save ethers

yarn add ethers

pnpm add ethers

bun add ethers

• npm
• Yarn
• pnpm
• Bun

npm install --save viem

yarn add viem

pnpm add viem

bun add viem

Initialize

const { Web3Auth } = require('@web3auth/node-sdk')

const web3auth = new Web3Auth({
  clientId: 'YOUR_CLIENT_ID',
  web3AuthNetwork: 'sapphire_mainnet', // or 'sapphire_devnet'
})

await web3auth.init()

const result = await web3auth.connect({
  authConnectionId: 'YOUR_AUTH_CONNECTION_ID', // Your custom authentication connection name
  idToken: 'USER_ID_TOKEN', // JWT token from your auth system
})

Get Account

// Get user's Ethereum public address
const address = result.signer.getAddress()
console.log('\x1b[33m%s\x1b[0m', 'Accounts:', address)

Get Balance

const address = await result.signer.getAddress()
const balance = ethers.formatEther(
  await result.signer.provider.getBalance(address) // Balance is in wei
)
console.log('\x1b[33m%s\x1b[0m', 'Balance:', balance, 'ETH')

Sign a message

const signature = await result.signer.signMessage(message)
console.log('\x1b[33m%s\x1b[0m', 'Signed Message:', signature)