What is Nostr?

Public Key
npub18duflts53l9pd904gzuw494se026f8qcfuhz97azre5qhdm70e7scdrp70
Profile Code
nprofile1qqsrk7yl4c2gljskjh65pw82j6cvh4dynsvy7t3zlw3pu6qtkal8ulgccylhd
Author Public Key
npub18duflts53l9pd904gzuw494se026f8qcfuhz97azre5qhdm70e7scdrp70