Setup Convex with Sigma Auth

Guide for integrating Sigma Auth (Bitcoin-native authentication) into a Convex application using the @sigma-auth/better-auth-plugin package with @convex-dev/better-auth.

For general Better Auth concepts (session management, plugins, hooks), see Skill(better-auth-best-practices). This skill covers Convex + Sigma specific wiring and deployment pitfalls.

When to Use

• Building a Convex backend with Better Auth
• Adding Bitcoin-native auth to a Convex app
• Implementing OAuth flow with auth.sigmaidentity.com
• Integrating BAP (Bitcoin Attestation Protocol) identity
• If you are not using Convex, follow Mode B in setup-nextjs instead

Installation

bun add @convex-dev/better-auth@0.10.10 better-auth@1.4.9 @sigma-auth/better-auth-plugin