EIP-4361 (SIWE)

Standards/Coordination Systems

Sign-In with Ethereum standard enabling Ethereum accounts to authenticate with off-chain services via a structured, human-readable signed message, replacing OAuth/social login with user-controlled cryptographic identity.

Hybrid Open Standard Low capture risk

Links

Visit Community

Details

License https://github.com/spruceid/siwe

Dev Status Final

Owner SpruceID (Spruce Systems, Inc.)

Country United States

Start Year 2021

Stack Language-agnostic message format, reference implementations in TypeScript, Rust, Go, Python, Elixir, Ruby

Funding Foundation

Last Investigated Mar 10, 2026

Use Case Domains

Identity & Trust

Affordances

Sovereign identity

Smart Contract Standard Attributes

Permissions Permissionless; any dapp or service may implement SIWE; no central authority

Development Tools siwe npm package (TypeScript), siwe-rs (Rust), siwe-go (Go), siwe-py (Python); MetaMask native integration via MIP-0003; WalletConnect support; Auth0 SIWE plugin

Protocol Maturity / Standardization Final EIP; 3M+ library downloads; integrated into MetaMask, WalletConnect, Auth0; widely adopted in Web3 authentication flows

Trust Framework Cryptographic: wallet signature verification via EIP-191; nonce-based replay prevention; domain binding prevents cross-site forgery; session expiry via timestamp fields

Target Application Domain Web3 authentication, DAO gating, token-gated content, decentralized social platforms, civic identity, data vault access control

Deployment Model Off-chain message signing + on-chain address verification; no contract deployment required for basic auth; optional ERC-1271 for smart contract wallet support

Standard Type Identity Standard

Ecosystem Ethereum (chain-agnostic message format; chain-id field enables multi-chain adaptation)