What is Nostr?

Bitcoin 20,999,999.997555300
Public Key
npub1kcezm3tjlsp5hsjg3evvk9vp30whx3j0c56gga6jq9vegktzndpsvkvzxm
NIP-05 Address
coffeemaximalist@nostrplebs.com
NIP-57 Address
retiredpaul66@walletofsatoshi.com
Profile Code
nprofile1qqstvv3dc4e0cq6tcfygukxtzkqchhtnge8u2dyywafqzkv5t93fksctylh24
Author Public Key
npub1kcezm3tjlsp5hsjg3evvk9vp30whx3j0c56gga6jq9vegktzndpsvkvzxm