npub1xf…28w03 on Nostr: what is this?

{ "id": "4cf0e58cb7f20560ac6ea81068aa56be4405f899c6b071fb15920aa2bdc0f559", "pubkey": "325b6c7ed05817a5a93bbf178abbba6d18f28c26f4131ea4f433447567e331c4", "created_at": 1672955146, "kind": 1, "tags": [], "content": "what is this?", "sig": "9f7544f510ded089c92fd6efde3f6a41b1e27397a48507742179123b6b5836a71476ac13ef860e46d8d9f00f9df23dc68422be2c0b0fa74ca1f87e92df940f06" }