What is Nostr?

Public Key
npub1wnh9r3tr7gwfhv649enry59q6xyr3gz3pxv3va54ve0glq49d0wstvejnt
Profile Code
nprofile1qqs8fmj3c43ly8ymkd2jue3j2zsdrzpc5pgsnxgkw62kvh50s2jkhhgxspljg
Author Public Key
npub1wnh9r3tr7gwfhv649enry59q6xyr3gz3pxv3va54ve0glq49d0wstvejnt