nobody on Nostr: who is that?

{ "id": "c256b254f203d9494fe523710b1d7817bb15d4a9d8ccc9e9fa2b6fd7196c5efd", "pubkey": "1fe03aba8f6b5cb0e359fe6ac72c122d4d1b402bca812990c10f9c465f6e7d0a", "created_at": 1712857855, "kind": 1, "tags": [ [ "e", "ac91bae0afa70952c72a1801322736300ebb861f746a8e77870525f6d16bf2a3" ], [ "p", "b75b9a3131f4263add94ba20beb352a11032684f2dac07a7e1af827c6f3c1505" ] ], "content": "who is that?", "sig": "33552139f5296281516345f9f6e2575da386583756d8856e42ec9912c9d4f2c06191ad7045acc9a10d49b18b29ce2d0d2dd9dafd0d688b1f6ca00a49dba56592" }