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Sign-In with Ethereum

Sign-In with Ethereum is a TypeScript library and message-format specification for authenticating Ethereum accounts to off-chain services. Users sign structured messages containing scope, session details and security parameters such as a nonce; services can verify the messages and use the workflow to establish authenticated sessions.

Explore the practical guide ↓

Independent OpenViST project profile, based on linked sources.

Sign-In with Ethereum — OpenViST project profile in Developer Tools.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use SIWE when an off-chain service needs a standardized workflow for users to authenticate by signing an Ethereum account message, with session and security details represented in the message.

Who it is for

  • Developers adding Ethereum wallet authentication to web applications.
  • Teams building backend verification and session flows for Ethereum account sign-in.
  • Wallet-interface developers seeking a consistent, machine-readable sign-in request format.

Documented uses

  • Add wallet-based sign-in to an off-chain application.
  • Verify structured Ethereum sign-in messages in a backend.
  • Establish a session after authentication, including a cookie-based web session.
  • Present wallet sign-in requests in a recognizable, consistent format.
Before you choose

Requirements & limits

The SIWE repository is public and lists an Apache-2.0 license.

  • SIWE standardizes the sign-in message and workflow; the application still needs to verify messages and handle its own authenticated sessions.
  • Messages can carry scope and session details, as well as security parameters such as a nonce.
  • The project provides distinct Node, frontend, backend and end-to-end quickstart examples.
  • The README states that the TypeScript implementation has not undergone a formal security audit.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

Source-based practical guide

Install and build the Sign-In with Ethereum library

Install the monorepo dependencies and build the library.

Before you start

  • Node.js package manager with npm available.

Steps

  1. Run the command below to install dependencies.

    Documented command
    npm install

  2. Run the command below to build the library.

    Documented command
    npm run build

Expected outcome

The repository dependencies are installed and the library build is invoked.

Guide limitations

  • The README does not specify Node.js or npm version requirements.
  • The TypeScript library has not undergone a formal security audit.
Documentation 1 ↗
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
13 October 2026
Original website title
spruceid/siwe · Official homepage title · retained in its source language
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