Keybase's "Crypto tools" tab can do this, with "known destination" determined via social proof. https://keys.pub https://keys.pub is a re-implementation of thi

Keybase's "Crypto tools" tab can do this, with "known destination" determined via social proof. https://keys.pub https://keys.pub is a re-implementation of this use case without the messenger/cryptocurrency baggage that some dislike about Keybase.