I remember nostr:nprofile1qqsyvrp9u6p0mfur9dfdru3d853tx9mdjuhkphxuxgfwmryja7zsvhqpzamhxue69uhhv6t5daezumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezuamfdejj7qgwwaehxw309ahx7uewd3hkctcscpyug had an idea of keys that are ephemeral on the device so confiscated phones have no trace, but an NFC tag could be hidden in clothing or somewhere that would log in so you could still post under that account which people are trusting.
I don't see why you couldn't derive an ephemeral private key from another private key.
Eg to temporarily load an anon key, I enter some additional data to then derive a child key. This key is forgotten as soon as I shut the app down. It can again be retrieved using my loaded private key & my second secret.
