Sigma Auth

Welcome to Sigma Auth - the first Bitcoin-powered OAuth 2.0 authentication service. Replace passwords with cryptographic signatures for unprecedented security and user control.

Note on Bitcoin: Throughout this documentation, "Bitcoin" refers to Bitcoin SV (BSV) unless otherwise specified. All cryptographic operations, addresses, and transactions use the BSV blockchain.

Get Started

New to Sigma Auth? Start here:

Quick Start

Get Bitcoin authentication running in your app in under 10 minutes.

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Learn the Basics

Understand what Sigma Auth is and how it works.

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Compare Options

See how Sigma Auth compares to other auth solutions.

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Documentation Sections

Setup

Ready to integrate? Choose your path:

Customization

Make it yours:

Reference

Technical documentation:

Key Backup

Secure cross-device access:

Why Sigma Auth?

Zero Server Secrets - Private keys never leave your device

Lightning Fast - Global edge deployment on Cloudflare

OAuth 2.0 Compatible - Drop-in replacement for existing providers

Free to Self-Host - MIT licensed for unlimited use, or use our hosted service with generous free tier

Self-Sovereign - Users control their own identity

Community & Support