i meant nsec. but hey, npub too, or hex pubkey.
that means use 'sha256sum' btw https://linux.die.net/man/1/sha256sum
you have several options for the base too, you could derive off the npub, or the hex, or use xxd to turn the hex into binary, and then pipe that into xxd https://www.linuxjournal.com/content/doing-reverse-hex-dump
i meant nsec. but hey, npub too, or hex pubkey.
