I should clarify for anyone that lacks the context. The transaction goes straight from sender to receiver. Receivers details that enable invoice generation are primary address and view key, no spend key. The view only wallet details are encrypted in nostr account. You can change these details at anytime. When using [Gyges] you are authorising the use of those details, they are not stored on server, [Gyges] reads it in your profile after you grant permission. It pings public nodes to check payments from moment of invoice creation, in this example nostr:nprofile1qqs936kc97s4k4gqjnmltljgqns0uadh08d77t5mypg3anxkneks37gpzamhxue69uhkv6tvw3jhytnwdaehgu3wwa5kuegpz4mhxue69uhkummnw3ezumtfd3hh2tnvdakqx3v2gk 's node but a self hosted [Gyges] you could point it toward your own and of course make a fresh wallet just for [Gyges] blablabla