Web3Auth Integration

Web3Auth Integration

Web3Auth solves one of the main Web3 onboarding problems: users don't need to store a seed phrase or install MetaMask. Instead — login via Google, Apple, Twitter, email. Under the hood, keys are generated and divided through threshold cryptography (MPC/TSS), so neither the user nor Web3Auth holds the complete key.

Integration is relevant for applications where the target audience is not crypto-native users.

How It Works

Web3Auth uses distributed key generation. On first login via OAuth, a key pair is generated. The private key is divided into shares via Shamir Secret Sharing: one part is stored with Web3Auth nodes (tKey), another — in the user's browser (deviceShare), a third — optionally backup (e.g., password-encrypted).

To recover access, you need at least 2 of 3 shares. Lost your device — recover via OAuth + backup. Web3Auth never has all parts simultaneously.

Quick Integration

import { Web3Auth } from '@web3auth/modal'
import { CHAIN_NAMESPACES } from '@web3auth/base'

const web3auth = new Web3Auth({
  clientId: 'YOUR_CLIENT_ID', // from Web3Auth Dashboard
  chainConfig: {
    chainNamespace: CHAIN_NAMESPACES.EIP155,
    chainId: '0x1',
    rpcTarget: 'https://rpc.ankr.com/eth'
  }
})

await web3auth.initModal()

// Login — shows modal with Google/Twitter/Email
const provider = await web3auth.connect()

// Standard EIP-1193 provider
const ethersProvider = new ethers.BrowserProvider(provider)
const signer = await ethersProvider.getSigner()

Web3Auth returns an EIP-1193 compatible provider — works with any existing code that expects a standard wallet provider. Minimal changes to existing code.

Customization and White-Label

For production applications, usually a white-label variant is needed — your UI without Web3Auth branding. Web3Auth No Modal SDK allows complete UI control:

import { Web3AuthNoModal } from '@web3auth/no-modal'
import { OpenloginAdapter } from '@web3auth/openlogin-adapter'

const web3auth = new Web3AuthNoModal({ clientId, chainConfig })

const openloginAdapter = new OpenloginAdapter({
  adapterSettings: {
    uxMode: 'redirect', // or 'popup'
    whiteLabel: {
      appName: 'My App',
      logoLight: 'https://example.com/logo.png',
      defaultLanguage: 'en'
    }
  }
})

web3auth.configureAdapter(openloginAdapter)
await web3auth.init()

// Specific authorization provider
await web3auth.connectTo('openlogin', { loginProvider: 'google' })

Timeline

Basic integration with ready-made modal: 1–2 days. White-label with custom UI, multiple OAuth providers, integration with existing auth system: 1–2 weeks. Web3Auth is well documented, SDK is mature.