Just hash the private key and use the as the next

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Hash chain

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.

probably not wise tbh.

thanks

yeah, it's an easy first thing to try, you see. one less layer of protection against breach.

if you added more data to it then it starts to morph into a HD keychain scheme.