Please make it possible to use public keys as identifiers somehow, maybe linked via for example keybase.io to provide simplicity in lookups and tracking usernam

Please make it possible to use public keys as identifiers somehow, maybe linked via for example keybase.io to provide simplicity in lookups and tracking usernames. It would also be much easier to allow federation with that mechanism, as your keybase.io account even could point to your chosen server together with the public key.