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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<Taek> betawaffle: depends on how far back the checkpoint is, and what the process is for generating the checkpoint
<Taek> ah crap was reading backlog, sorry
<betawaffle> Taek: no worries
<betawaffle> i know what you're talking about
<Taek> was your question answered well or do you want me to continue?
<betawaffle> i'll take what you've got
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<Taek> There are a few problems with checkpoints, but if you address them all carefully I think it'd be perfectly safe to introduce checkpoints into Bitcoin
<Taek> One of the big issues is that you are erasing history. When you create a checkpoint, the purpose is usually to eliminate a huge part of the chain and a part of IBD
<Taek> you can't reorg backwards past the checkpoint
<betawaffle> like the UTXO set, how can you get it from a trusted source
<Taek> well, like you mentioned, the Genesis block and the bitcoin-core code itself is also technically fully trusted
<betawaffle> nobody likes the IBD
<betawaffle> luckily the genesis block doesn't need a UTXO set
<Taek> so, you can solve the trust issue by putting the historic blockchain into the build process, and actually working from the code+history to build the checkpoint when you build the bitcoin-core binary
<betawaffle> it's empty ;)
<betawaffle> but you can't ship 10 Gigs with core
<Taek> then you can hash the utxo set, (probably with a Merkle tree), and you trust the hash absolutely, just the same as you trust the bitcoin-core binary absolutely
<Taek> but the build process fully verifies the hash
<betawaffle> ahh, and download it from somewhere
<Taek> yeah
<Taek> and you just check it matches your hashes
<betawaffle> clever
<Taek> For developers and for people who prefer to build everything from source using the gitian process, this checkpointing process actually provides no shortcuts, b/c you still need the full history
<Taek> but for people who are comfortable just downloading a signed binary, they can safely skip IBD using the same trust model they are already using
<sipa> :)
<betawaffle> sipa: how are those going, btw?
<sipa> betawaffle: haven't made much progress - there are a few design considerations that haven't been resolved
<betawaffle> (i read the meeting a couple weeks ago)
<sipa> a) use 3072-bit MuHash b) use secp256k1 ECMH c) use GLS254 ECMH
<betawaffle> interesting choices
<sipa> secp256k1 is the slowest
<sipa> GLS254 is complicated to implement
<sipa> b & c both are very easy to precompute though, which is not true for MuHash (due to the huge state)
<betawaffle> where can i read about these (for my reading list)?
<sipa> this is probably the best reference: https://arxiv.org/pdf/1601.06502.pdf
<kanzure> when's the secp256k1 paper happening, sipa
<kanzure> or a reference doc of some kind
<sipa> that paper introduces GLS254-based ECMH, which has pretty much all the things we need... except it a complicated and odd construction specifically designed for this purpose
<kanzure> excuse me, i mean libsecp256k1 of course.
<sipa> kanzure: eh, some time...
<kanzure> fair enough
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<betawaffle> sounds good, thanks!
<Taek> sipa: that stuff looks great. honestly had not considered that it might be possible to efficiently compute the utxo hash as you go
<Taek> That opens up a lot of possibilities
<sipa> depends what you consider efficient :)
<sipa> the GLs254 stuff is crazy, and hands multiple million updates per second
<sipa> but the rest is orders of magnitude slow
<sipa> *er
<Taek> The blockchain already doesn't move faster than tens of thousands of updates per second, right? So if you can do 100k or so, it shouldn't be a huge performance impact overall I would think
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<sipa> Taek: there are 3 metrics that matter (a) how much overhead does it add to IBD (b) how much overhead does it add to validation at the tip with pre-validated mempool txn (c) how much does it cost to compute based off a UTXO set
<sipa> there are almost a billion inputs+outputs in the bitcoin chain IIRC, so 100000 ops/s still means 3 hours of extra CPU time
<sipa> for a
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<Taek> ah yeah, I was thinking O(100 million), but that's closer to the transaction count than the input/output count
<sipa> on the other hand, the ECMH stuff means you can precompute the combined effect of a whole transactions, and apply it in O(nothing) time
<sipa> which is great of keeping up at the tip
<sipa> you can do that with MuHash too, but requires 768 bytes of storage per tx
<Taek> per output in the utxo set you mean?
<Taek> that's pretty nasty either way
<sipa> no, per tx in the mempool
<Taek> oh. That's not too bad then
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<sipa> 3072 bits = 384 bytes
<sipa> however, modular inverse is slow, so you have to store it as numerator / denominator
<sipa> and only apply the inverse once when you actually need the hash
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<gmaxwell> Taek: it's not terrible but otoh, median transaction size is only about 250 bytes itself.
<sipa> a lot more in memory, though
<gmaxwell> Taek: so even considering overheads it more than muhash based would half mempool depth for a gven usage.
<gmaxwell> given*
<sipa> my average mempool tx is 7000 bytes in memory or so, though
<sipa> but that's biased because larger txn tend to linger longer
<gmaxwell> GLS254 stuff really doesn't excite me, I have no interest in diving down characteristic 2 ECC crypto rabbit hole.
<gmaxwell> sipa: there was a big flood of large very low feerate txn last weekend.
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<Eliel> might someone have a list of known smart contracts, that were borked by malleability. It's rather boring to only have payment channels (and LN by extension) to show as an example.
<waxwing> Eliel: i think the generalisation is wherever you need to prepare a signed refund before doing the funding. well, good Q though, what are other cases.
<waxwing> the recent paper about Loaded vs Roger hard fork bet had a really good illustration.
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<waxwing> on that same topic, andytoshi i think i forgot to tell you that you were right all along about that coinswap setup i was doing, even though i somehow managed to convince you otherwise :)
<Eliel> waxwing: do you have a link to the paper?
<waxwing> further on that topic, the long writeup i did here https://joinmarket.me/blog/blog/coinswaps/ notes how an atomic swap that doesn't care about privacy doesn't need to worry about malleability, but one that does does
<waxwing> Eliel: i'll look it up, hang on
<Eliel> thank you
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<yoleaux> Decoding the Enigma with RNNs. They trained a LSTM with 3000 hidden units to decode ciphertext with 96%+ accuracy. https://greydanus.github.io/2017/01/07/enigma-rnn/ https://video.twimg.com/tweet_video/DFTQe0XUQAAtu20.mp4 (@hardmaru)
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<andytoshi> waxwing: was i? you convinced me otherwise by using CLTV in place of traditional locktimes everywhere
<waxwing> andytoshi: yeah but i had a total derp-style fail there :) the CLTV stuff is great, so that say a standard atomic swap works, but when you're trying to "override" a hash locked + cltv output with a p2sh, used as backout, you need to sign the latter upfront, bring the malleability issue in.
<waxwing> that's what i meant about "care about privacy or not" above
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<waxwing> sorry the reference to 'p2sh' there is not relevant, ignore that. just override with some standard output.
<andytoshi> yeah, i got it, i'm thinking through this
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<waxwing> kanzure: that does look cool eh, i note they used gradient descent, wonder if they used simulated annealing.
<andytoshi> i thought the strategy was that the first transaction gets confirmed before anything else happens (and its outputs have a CLTV clause that make this safe), so it can't be malleated
<waxwing> yeah that was my thinking error - you need to prepare the signed backout in advance of doing that.
<waxwing> so if that pay-in gets malleated, the signed backout is useless
<waxwing> (since it refers to pay-in)
<waxwing> hmm no i'm thinking of simplex not gradient descent, whatever it does look fun :)
<andytoshi> why? the outputs of the pay-in have a CLTV clause that lets the original spender get it back, and they can sign long after the fact
<waxwing> ok, it sounds like you're thinking of a different design there, where the pay-ins have custom redeems.
<waxwing> i was trying to build a swap with pay-in and payout standard txs (p2sh actually)
<waxwing> see diag in middle of https://joinmarket.me/blog/blog/coinswaps/ (although you saw it before)
<waxwing> like i say afaict if you don't care about anonymity set then you can sidestep malleability issues. well that's what it seems.
<waxwing> yeah you're talking about what i called 'atomic swap without privacy features' in the section above
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<andytoshi> ahh ok
<andytoshi> understood, i think you convinced me about the non-privacy one
<andytoshi> and i didn't realize you had a better design in mind
<waxwing> andytoshi: that's the most logical explanation :)
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<kanzure> win 2
<kanzure> jeiwqjfi0f9213r
<kanzure> ig-nore
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<kanzure> "A trustworthy proof checker" https://www.cs.princeton.edu/~appel/papers/flit.pdf
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<kanzure> .wik curry-howard correspondence
<yoleaux> "In programming language theory and proof theory, the Curry–Howard correspondence (also known as the Curry–Howard isomorphism or equivalence, or the proofs-as-programs and propositions- or formulae-as-types interpretation) is the direct relationship between computer programs and mathematical proofs." — https://en.wikipedia.org/wiki/Curry-Howard_Correspondence
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<kanzure> "Proof checking and logic programming" http://www.lix.polytechnique.fr/~dale/papers/lopstr2015.pdf
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<kanzure> "Foundational proof checkers with small witnesses" https://faculty.ist.psu.edu/wu/papers/checker.pdf
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<Taek> I would be very interested in a list of cryptocurrency zero-days that led to thefts >$100k, if anyone knows of such a thing or something similar
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<EarlyGrey> hi kanzure, there was a rumor earlier about how if there is a hard fork that options wouldnt work. can you add anything to put that rumor to bed?
<kanzure> wrong channel?
<EarlyGrey> you cant answer?
<kanzure> i think it's rude to flood -wizards with this. let's not.
<EarlyGrey> where may i ask?
<EarlyGrey> im banned everywhere
<kanzure> how about PM.
<EarlyGrey> why not on the public record?
<EarlyGrey> its not as if this channel is overflowing with messages
<EarlyGrey> so you wont answer the question publicly only in PM?
<EarlyGrey> ok
<kanzure> -wizards is the wrong place, and you have lost the privilege to participate in other channels. so, send me a PM is about your only option if you're truly banned everywhere else.
<EarlyGrey> shall i relay it to my friends on #bitcoin and you can answer there?
<EarlyGrey> im not asking for that much, just an answer to question that involves you!
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<EarlyGrey> not answering just opens yourself to wild speculation that its true.
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<stevenroose> #censorship! rbtc Ver kingdom bitmain agenda troll troll
* nsh frowns
<nsh> not here, please :)
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<betawaffle> oh shit, what happened here
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<ItsFibonacci> Is there a moderator on I can speak with
<ItsFibonacci> I have an important suggestion for the community but I'd like to make the suggestion with the nick Fibonacci so you know it's me. No troll this is legit
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<betawaffle> Fibonacci: PM me?
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