What is Nostr?

Public Key
npub1klju6f6esgxeaf4tpp2a3gjgakj589s834kf33dwrj40ycm8cr8s4djks0
NIP-05 Address
madwanker@nostrplebs.com
NIP-57 Address
sedateopinion09@walletofsatoshi.com
Profile Code
nprofile1qqst0ewdyavcyrv7564ss4wc5fywmf2rjcrc6mycckhpe2hjvdnupncz27rqc
Author Public Key
npub1klju6f6esgxeaf4tpp2a3gjgakj589s834kf33dwrj40ycm8cr8s4djks0