#bitcoin-wizards on 2018-05-05 — irc logs at freenode.irclog.whitequark.org

2015-10-30 00:53 sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja

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18:25 <arubi> hey, can I prove to you that I know a signature for some message and pubkey without disclosing the message? for example, first I give you ((r, s), P, zG) where (r,s) is the siganture, P is the pubkey and z is the message; then I also prove knowledge of z by giving you a second signature where zG acts as a pubkey, and finally you check that 'zG == sR - rP' ?

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19:35 <waxwing> arubi, it sounds right to me (except P should be fixed ahead of the signature in the first bit, not handed over concurrently).

19:35 <waxwing> although it's quite mindbending and hard to understand what you're trying to do

19:42 <waxwing> you're saying you want to prove that you know the message to which this signature corresponds, and that the sig is valid for the given pubkey, not prove that you *know* a signature (i guess there's no way to make the latter make sense really, given a signature is (partly) a proof of knowledge itself).

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19:44 <arubi> yes, exactly. I want to prove validity and also commit to all these values, but not disclose the message itself

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19:45 <arubi> the reason why I want this : https://joinmarket.me/blog/blog/coinswaps/ , specifically "Another privacy tweak appears impossible for now" , I feel that this might be possible if sighash noinput is merged

19:45 <waxwing> hmm why not just use a hash of the message? :) (which we do)

19:46 <waxwing> oh, ok.

19:46 <arubi> because I can't feed <hash message> to a scriptpubkey

19:46 <arubi> say the message is alice's spend out of her backout, and bob has to figure out a secret value when she does that

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19:47 <arubi> (I'm writing it all down in a way that's understandable, but since you asked... :) )

19:47 <waxwing> yeah. understood.

19:47 <waxwing> i mean, understood that it is not (yet) understood :)

19:50 <arubi> I'm gonna tidy things up and paste it at #coinswap, if not today than hopefully tomorrow

19:55 <arubi> oh, just to be a bit more clear, the secret message is alice's spend out of her backout transaction - her sighash basically. bob doesn't have to know about it until it actually happens, but he can freely sign for the spend into the scriptpubkey that commits to a pubkey + noinput signature. if she ever tries to redeem that scriptpubkey, the message is revealed and bob gains knowledge of a secret parameter (well, hopefully)

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23:03 <roasbeef> arubi: see "a signature scheme with efficient protocols" perhaps? able to give a zkp that a commitment is one to a valid signature of another commitment

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