George Kadianakis wrote: > Patrick Schleizer <patrick-mailingli...@whonix.org> writes: > >> Hi, >> >> is it possible to derive an hidden service onion v3 private key from a >> mnemonic seed [1]? >> >> Cheers, >> Patrick >> >> [1] https://en.bitcoin.it/wiki/Seed_phrase > > I think that should be possible reading > https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki . > > I don't think there is anything that stops us from taking the generated > onion private key, splitting it up as specified, and assigning a > mnemonic to it. You could imagine a third-party tool that just reads the > privkey file and outputs the mnemonic, or reads the mnemonic and > generates a privkey file. > > Not sure if this belongs to the upstream Tor code, but I guess it if it > gains enough popularity something can be arranged ;) >
Indeed, it should be possible. I have discussed on a chat with one of the authors of BIP39 about this just before v3 HS code was here and there's nothing that prevents it. This is under my attention, as well as, offline master keys for onion services. These two items go together very well, and I think there should be part of Tor code and documented in the manuals, so less experienced users avoid to use third party scripts that they do not understand. This way one can hold on to an onion service for so long time, being able to restore from a human memorable (or at list write-able on paper) phrase and also make it seized-proof.
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