What is Nostr?

Public Key
npub1u8ksddqc6jry363g3dh2tsx2s5kluq2yuhumvwd5gawv2rja03zqk5a2jn
Profile Code
nprofile1qqswrmgxksvdfpjgag5gkm49cr9g2t07q9zwt7dk8x6ywhx9pewhc3qtuafwh
Author Public Key
npub1u8ksddqc6jry363g3dh2tsx2s5kluq2yuhumvwd5gawv2rja03zqk5a2jn