What is Nostr?

Public Key
npub1mwrjvcyq3tamwc7th3lz67r22jjhd3dd4hjxrvztwj5kwvzhu60sr25sxy
Profile Code
nprofile1qqsdhpexvzqg47ahv09mcl3d0p49fftkckk6merpkp9hf2t8xpt7d8cxyx640
Author Public Key
npub1mwrjvcyq3tamwc7th3lz67r22jjhd3dd4hjxrvztwj5kwvzhu60sr25sxy