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Library Implementations

SIWE provides official libraries for integrating EIP-4361 authentication into your application.

Official Libraries​

TypeScript/JavaScript​

The original and most feature-complete SIWE implementation.

  • Package: @signinwithethereum/siwe on npm
  • Platforms: Node.js, Browser, React Native
  • Features: Provider-agnostic (viem, ethers), EIP-6492 support, strict mode
  • Best for: Web applications, React/Vue/Angular apps, Node.js backends

Rust​

High-performance, pure Rust implementation.

  • Package: signinwithethereum on crates.io
  • Platforms: Server applications, CLI tools, embedded systems
  • Features: Zero-copy parsing, EIP-6492 support via alloy, serde serialization
  • Best for: High-performance backends, blockchain infrastructure, CLI tools

Python​

Idiomatic Python implementation built on pydantic and web3.py.

  • Package: signinwithethereum on PyPI (imports as siwe)
  • Platforms: Python 3.10+ backends, scripts, data pipelines
  • Features: Pydantic-validated messages, EIP-1271 and EIP-6492 support via web3.py
  • Best for: Django / FastAPI / Flask backends, Python services and tooling

Go​

Pure-Go implementation, a port of the canonical TypeScript library.

  • Module: github.com/signinwithethereum/siwe-go
  • Platforms: Go 1.21+ services, CLIs, blockchain infrastructure
  • Features: Structured error types with machine-readable codes, EIP-1271 and EIP-6492 support via any go-ethereum–compatible RPC client
  • Best for: Go backends (net/http, Gin, Echo, gRPC), indexers, bots

Quick Comparison​

FeatureTypeScriptRustPythonGo
Message Parsing✅✅✅✅
Signature Verification (EIP-191)✅✅✅✅
Contract Wallets (EIP-1271)✅✅ (with alloy feature)✅ (with web3 provider)✅ (with EthCaller)
Counterfactual Wallets (EIP-6492)✅✅ (with alloy feature)✅ (with web3 provider)✅ (with EthCaller)
Nonce Generation✅✅✅✅
Serde SerializationN/A✅ (with serde feature)N/A (pydantic)N/A (stdlib JSON tags)
Browser Support✅❌❌❌
Async Verification✅✅❌ (sync)✅ (ctx-based)

Specification Compliance​

Both libraries implement:

  • EIP-4361 (Sign In with Ethereum)
  • EIP-191 (Signed Data Standard)
  • EIP-1271 (Contract Signatures)
  • EIP-6492 (Counterfactual Signatures)
  • RFC 3986 (URI Specification)
  • RFC 3339 (Timestamp Format)

All libraries generate identical EIP-4361 compliant messages — signatures created in one language can be verified in any other.