#bitcoin-wizards on 2018-07-25 — 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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00:18 <kanzure> oof "if a scheme only supports all signers to sign the same message rather than their own, it's called a multisignature rather than an aggregated signature"

00:18 <kanzure> oh wait, that's standard.

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21:32 <jimpo> Unlinkable atomic swaps between honest but mutually distrusting parties are possible just with MAST, right? Like each output has three spend clauses, 2-of-2 multisig, sig + hash preimage, sig + CLTV. Requires an additional round of interaction though.

21:32 <jimpo> Or is that not correct?

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21:33 <gmaxwell> they're possible without mast, using refund transactions. So long as you don't mind only having the anonymity set of 2 of 2 multisig.

21:34 <jimpo> Oh, good point.

21:35 <gmaxwell> pre-segwit refund tx were vulnerable to malleability, but thats solved now.

21:36 <gmaxwell> Now the only issue with them is just implementing the state machine that handles the refunds and what not is a PITA.

21:39 <jimpo> Wait, actually, how do you make them unlinkable (without the expensive cut-and-choose type thing)?

21:40 <jimpo> nvm, I think I see it. Where the 2-of-2 multisig has a presigned tx going to a regular atomic swap type tx.

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21:42 <gmaxwell> jimpo: right https://bitcointalk.org/index.php?topic=321228.0

21:42 <gmaxwell> (the specific protocol there is more complicated than you'd need now, becuase of things like CSV, but it covers the idea)

21:44 <jimpo> thx

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