null on Nostr: What's this.

{ "id": "ca7d073df046f491dc52714a327920e6cb266c85186be1052ab15bd36fbc5f92", "pubkey": "6ee554f29dc7b4656562be33bbadd1424ea7be954000415805641bc975c86de0", "created_at": 1675458425, "kind": 1, "tags": [], "content": "What's this.", "sig": "c14b7c9677b54068fa88dcf04bfb18bb3767692b6c422012326de9b24ebdec014453b3239810ac9f9f350f7ae6addf5c40dd0e28ffba73379c09c3a117149d17" }