Wait, how are they even possible? Not sure if I'm reading this right:
Let's say you are able to convert your nsec with
echo -n "your_text_here" | shasum -a 256
& then to WIF so you can import it to a Bitcoin client...
how does the person pay you if all they know is your npub? Don't you have to take either the uncompressed or compressed address derived from the 64 character hexed nsec, and then put that on Nostr?
Can We Turn a Nostr Public Key into a Bitcoin Address?
Can We Turn a Nostr Public Key into a Bitcoin Address?