What is Nostr?

Public Key
npub1wrrzte0nd3ulxufnwqvyrn6te72jtxv9sfymmxj0mrn7dprdmr7s42pnt6
Profile Code
nprofile1qqs8p339uhekc70nwyehqxzpea9ul9f9nxzcyjdanf8a3elxs3ka3lg7uden8
Author Public Key
npub1wrrzte0nd3ulxufnwqvyrn6te72jtxv9sfymmxj0mrn7dprdmr7s42pnt6