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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<Dako300>
I'm trying to collect responses for a survey for a final project for my Economics course. If any of you could fill out this survey, that would be greatly appreciated. Thanks https://forms.gle/65ptTzKV13cZWxYSA
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<waxwing>
the ECDSA 2 PC thing based on Paillier that was published (I guess over a few different papers, Lindell etc. but most recently that Moreno-Sanchez et al thing, right) - am I right in remembering there is no generalization to more than 2 parties?
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<waxwing>
istr Lindell did a presentation on an idea of doing threshold signatures with it, but i also seem to recall it involved something whacky so maybe not directly relevant. i can try to look it up later but thought maybe someone here has better memory :)
<waxwing>
nickler, many thanks. the second is the one i was remembering Lindell giving a pres. on. I can't remember why I thought it a bit whacky, but, do we think this is could make a N of N multisig in a single ECDSA key be viable?
<waxwing>
i have in mind more specifically, an application using adaptor secrets, which I know carries over as per the Moreno-Sanchez paper, but I have no clue whether such a thing might be remotely possible with ECDSA cleverness.
<waxwing>
Hmm probably not a question people could reasonably be expected to answer, so no worries.
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<waxwing>
sorry incomplete thought: an application using adaptor signatures, but with more than 2 parties, which I know carries over *for 2 parties* to the existing ECDSA thing, but .. etc etc
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<nickler>
fwiw the musig implementation in libsecp-zkp already supports multi-party adaptors
<waxwing>
nickler, on that point, was discussing a bit with andytoshi earlier about that idea ^ , seems like it's more possible than he thought. or somethign like that. also, it could of course be nonsense :)
<andytoshi>
libsecp-zkp supports 2-party adaptors to be clear
<andytoshi>
it might support S6 but that's purely accidental :P
<waxwing>
right. i should mention for the cognoscenti that the only important part of the post is the section "Atomicity for N parties", if you're familiar with the background, the other parts won't be of much interest.
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<instagibbs>
anyone have thoughts on benefits of having the nBits field in the blockheader is, if any? All I can think of is corruption check when reading off disk
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<instagibbs>
AFAICT that's the only "use" in Core
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<instagibbs>
gmaxwell, I heard you had a semi-plausible reason
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<belcher>
so that the PoW can be checked independently from anything else?
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<andytoshi>
belcher: well, the issue is that you need the rest of the headers to know what `nBits` should be
<belcher>
what it should be in terms of bitcoin consensus rules, yes, but perhaps PoW has value outside of all that since you can work out how much calculation would have been required to generate it
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<sipa>
instagibbs: before headers-first, it was necessary
<instagibbs>
elaborate for the ignorant please
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<sipa>
instagibbs: right now, all parent headers are verified before downloading a block, and with those, you can just recompute nBits
<sipa>
but before headers-first, blocks were downloaded sometimes before all parents were known
<sipa>
with the nBits field in them, (some) PoW checks were possible even wirhout having all parents
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