Web3 Authentication: Building Secure Wallet-Based Login with WalletConnect & SIWE
Muhammad Zain
TelGates Team
Wallet-based authentication is replacing traditional username/password login in Web3 applications. Here's how to implement it securely.
Why Wallet Authentication?
- No passwords to store, hash, or breach
- Users control their own identity
- Cryptographic proof of ownership
- Seamless onboarding for crypto-native users
Sign-In with Ethereum (SIWE)
SIWE (EIP-4361) standardizes wallet authentication: 1. User clicks "Connect Wallet" 2. App generates a nonce and challenge message 3. User signs the message with their private key 4. Backend verifies the signature matches the claimed address 5. JWT/session token issued for subsequent requests
Security Considerations
- Always generate server-side nonces to prevent replay attacks
- Set message expiration to 5-10 minutes
- Validate the domain in the SIWE message matches your app
- Implement rate limiting on verification endpoints
- Store sessions server-side, not just in cookies
Multi-Chain Support
WalletConnect V2 supports 300+ wallets across EVM chains, Solana, Cosmos, and Polkadot. Our implementation at TelGates handles chain switching and multi-wallet scenarios gracefully.
Implementation Timeline
A complete wallet authentication system typically takes 2-3 weeks to implement, including backend session management, chain switching, and mobile wallet support.