The identity service maintains a mapping from userID → [user_info, public_key], and also user_info → userID. user_info is a username for password auth and a wallet address for wallet auth. The public_key is used to log users into keyservers. Users should send the public_key as part of PAKE registration or Wallet login.
Note: We already get the wallet address in the siweMessage as part of the WalletLoginRequest