SKI on Nostr: What’s his npub?

{ "id": "c31704f189908c2254560adb792f61d52bfc7b9a63ae7d2e1e58ea5055725135", "pubkey": "709bd2be88c1f020b36d0b1414fd92e7306e8b91612bef0b3e3e202189d608e0", "created_at": 1736993748, "kind": 1, "tags": [ [ "e", "70faa1b3fd0ce905ee0de200809d9edcd3b36544b09ae10c350ae7fb18244334", "wss://nostr.einundzwanzig.space", "root" ], [ "p", "d307643547703537dfdef811c3dea96f1f9e84c8249e200353425924a9908cf8" ] ], "content": "What’s his npub?", "sig": "298bd8b239cd6cb13459b45753fa72e724aae1afe9e5ad04f31afa2c758a9ae802a08be80efd2452452c82ef9dbbf90968b72317d7cf644aad3a96ea3b587214" }