PK on Nostr: how to be sure?

{ "id": "9960c198383c7212bbc3ea8aeb156aac94881c0425834b5337c7bff62c45ce30", "pubkey": "a79bb20359b847da1bab1cdf08404f8832f26ada2b1ea36c44060697dde63268", "created_at": 1733075637, "kind": 1, "tags": [ [ "p", "28a18e28ed93afd0e7108dee504a9619cb7edc1adfcd47b6004f946398c063f4", "", "mention" ], [ "p", "6685580e55b2f17aa639c94595083edfeb328e175af73587bb4e5af9b0396513" ], [ "e", "a608ae89e944a7fd9141a9a84575b632be46640d1877d98d75cd12fa7035e82d", "wss://nostr-pub.wellorder.net", "root" ] ], "content": "how to be sure?", "sig": "4014da8a3a3aca98f919f7a0b9638789f5afd308558f056e1a4a5c515d8980ee67f9c2135ff0cfad150a5291f08fc15fa6de9eba4d19cb63089fb769c1449bc2" }