Support Sign In With Solana (SIWS)

Feature Request: Integrate Sign In With Solana into Supabase Auth Overview Add support for Sign In With Solana (SIWS) as a new authentication provider in Supabase Auth, allowing users to authenticate using their Solana wallets through a standardized, secure protocol. Motivation 1. Enhanced Security: SIWS provides a more secure authentication flow than traditional connect + signMessage methods by standardizing message formats and shifting message construction responsibility to wallets. 2. Improved UX: Replaces the multi-step connect + signMessage flow with a single signIn operation. 3. Growing Ecosystem: Solana has a large and growing ecosystem of dApps and users who would benefit from this integration. 4. Standardization: SIWS follows similar principles to Sign In With Ethereum (EIP-4361) while extending capabilities for the Solana ecosystem. Technical Implementation Required Changes 1. Add SIWS provider configuration: 2. Implement new auth endpoints: • /…