So basically you npub is a bitcoin address? This blew my mind nostr:nprofile1qqstnem9g6aqv3tw6vqaneftcj06frns56lj9q470gdww228vysz8hqpzamhxue69uhhyetvv9ujumn0wd68ytnzv9hxgtccu0ggt... So can you actually just remove npub and insert bc and bitcoin will show up? How does that work? Secondly how does one find that address? Please explain more.