"SIWF is actually Sign in with Warpcast"

1. The AuthKit library is open source -- anyone is free to fork it and make it work with their client. https://docs.farcaster.xyz/auth-kit/

2. The long term goal is to make it work with any "Farcaster wallet", i.e. apps that can handle all the Farcaster-specific signatures and transactions for using the onchain / Hub identity system.

3. SIWF is currently an extension of SIWE (Sign in with Ethereum). This means you need to sign in with your Farcaster custody address / private key -- which for the vast majority of users is stored on their phone with Warpcast (many in a Passkey).

4. We opted for the pragmatic v1 where it works reasonably well (still some improvements on QR code) for most people in a more human readable way around permissions than a normal SIWE signature.

5. We will eventually add make it support multiple Farcaster wallets, but there hasn't been much demand from users and devs have preferred us to focus on growth.