What is Nostr?

Public Key
npub1m5vje9vvl7886jyujgr9srlg44cftmkprwmujtjycf4ft8s6qlrs9s380c
Profile Code
nprofile1qqsd6xfvjkx0lrnafzwfypjcpl526uy4amq3hd7f9ezvy654ncdq03c44886f
Author Public Key
npub1m5vje9vvl7886jyujgr9srlg44cftmkprwmujtjycf4ft8s6qlrs9s380c