✅ Update SIWF Relay + AuthClient

Timeline: Done

Update the SIWF relay server and @farcaster/auth-client package to verify messages from auth addresses. Published in @farcaster/[email protected] and later.

Notes:

• Removed Ethers dependency in auth-client. Now uses Viem’s SIWE implementation, which supports 6492 signatures by default.
• Added optional acceptAuthAddress arg to verifySignInMessage. Apps using SIWF should set this to true if they support sign in with an auth address.
• Add acceptAuthAddress to relay session and createChannel args. Apps using SIWF should set this to true to signal that they support sign in with an auth address.
• Add authMethod to relay session. Wallet apps returning signatures to the relay should set this to "custody" or "authAddress" depending on the method used to authenticate.

✅ Update Mini App SDK

Timeline: Done

Update the mini app SDK to support login with auth addresses. Published in @farcaster/[email protected] and @farcaster/[email protected] and later.

Notes:

• Added optional acceptAuthAddress arg to the SDK signIn action. Apps that support auth address login should set this to true
• Added authMethod to the SDK signIn response. The host should set this to "custody" or "authAddress" depending on the method used to authenticate.

✅ Enable auth addresses in Key Registry

Timeline: May 15

Set a validator for keyType=2 in the Key Registry contract, enabling users to add and remove auth addresses at the contract level.

Notes: