Warpcast

if farcaster clients use coinbase smart wallets (or any other passkey-based wallet) under the hood for custody addresses apps could securely prompt users to create new signers without requiring a specific client like warpcast and they could easily sponsor signers

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I think the theory goes that any application can prompt any wallet primitive to add the signer's public key they want to by invoking it like a transaction, you shouldn't have to worry about what kind of account the custody address is, you can even make it a smart contract, a hardware wallet, a mobile wallet or a Safe or something if you really wanted. Should an app make those assumptions at the client level or delegate it to the user's wallet of choice?

This is possible today, but warpcast creates a mnemonic that you have to manually export and import into a wallet app if you want to use it this way which the average user is never gonna do. This approach is totally understandable because wallet UX was terrible up until very recently

But to your point, a public goods domain could be an easy and recognisable sign in option alongside others