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04:31 < Kiminuo> https://arxiv.org/abs/1905.10518 - page 5 - "Therefore, we resorted to a minimalistic approach, where we estimate the size of the set difference based on just the current sizes of sets and the difference observed in the previous reconciliation round:" - d = abs(|A| - |B|) + q . min(|A|, |B|) + c  <-- is "d" a floating point number because "q" is a floating point number, or is rounding up/down missing?
04:38 < gmaxwell> Kiminuo: d gets rounded for use.
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04:46 < Kiminuo> tx
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17:58 < M7918070_[m]> I've been thinking of a quasi-decentralized non-custodian way to set up a crypto-to-crypto exchange for a while now
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17:59 < M7918070_[m]> It's stupidly simple, you basically do cross-chain atomic swaps but without the atomic part. It works for all civilized cryptocurrencies, even those without smart contracts.
18:00 < M7918070_[m]> So, you send signed messages to a central server proving you control the cryptocurrency you want to trade. It adds you into an orderbook and matches trades. When it's matched you, it asks you to sign again, to make sure you're still on the line.
18:00 < M7918070_[m]> It generates 2-of-2 multisig addresses for both parties, and provides both parties the requisite information to generate them by themselves. Both parties sign them with the key they used to put out the ad and exchange these messages.
18:01 < M7918070_[m]> Then, the exchange asks both parties to sign transactions moving funds into the 2-of-2 multisig address, moving funds back (refund), and moving funds out.
18:02 < M7918070_[m]> It then sends out the first set of transactions to fund the contract, waits until they have cleared, and then sends out the final set. If a transaction is broadcast so that only one of the funding transactions clear, it refunds the other one.
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18:03 < M7918070_[m]> So, this is just a very convoluted way to do escrow. But the fine point is that the broker doesn't ever have custody of any cryptocurrency, and doesn't need to charge a fee or anything (very trivial software). That means there are no regulatory requirements, meaning random people could run it in their basement as an onion service.
18:04 < M7918070_[m]> Assuming the operator isn't colluding with either party to intentionally defraud the "customers", is there anything that could go wrong in this scheme?
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19:08 < gmaxwell> wtf is with that nopara post on bitcoin-dev, re-coinjoin amounts?    seems fairly obviously bogus to me.  Yes, in some cases with a lot of inputs, by chance some of the outputs will have a large anonymity set.  But often many of the outputs will not.   Enumerating all of them them in the workst case can be expensive, but commonly enumerating some of them is cheap.
19:08 < gmaxwell> But what I don't get is why this seems to be non-obvious to anyone.  Do people also think that big sudoku's are intractable?
19:09 < gmaxwell> *if* you assume things like "every user could also be paying another user"-- arbritarily, then sure, almost all mappings are valid. But that isn't how people use transactions.
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19:13 < M7918070_[m]> The people who want to hide could just split their transactions up, no?
19:14 < M7918070_[m]> They could even frame others: If they see a 0.00716 BTC input, they could send a 0.00716 BTC output to the drug market/hitman just to mess with people.
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