#bitcoin-wizards on 2017-06-24 — 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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05:17 <NicolasDorier> Question: is there any reason why a 2 by 2 escrow with timeout is always designed like

05:17 <NicolasDorier> https://www.irccloud.com/pastebin/XRRLdSd6/

05:17 <NicolasDorier> You can achieve same thing by saving 33 bytes

05:17 <NicolasDorier> with

05:18 <NicolasDorier> https://www.irccloud.com/pastebin/2M9tFxm7/

05:18 <NicolasDorier> using the OP_CODESEPARATOR

05:19 <NicolasDorier> never saw anyone using it that way though. Is there any down side to share the same public key for Bob for both the timeout and the mutlisig signature ?

05:20 <NicolasDorier> I wrote the difference between both on my script evaluator for anyone who wants to look it

05:20 <NicolasDorier> Before:

05:20 <NicolasDorier> After:

05:20 <NicolasDorier> Bob and Alice signing: http://n.bitcoin.ninja/checkscript?savedScript=43ca16ed-5edb-4f3c-a614-fba127050eb8

05:20 <NicolasDorier> Bob reclaiming http://n.bitcoin.ninja/checkscript?savedScript=b2de2420-b0fc-4f6d-9f3a-f8d0bab7e0be

05:20 <NicolasDorier> Bob reclaiming http://n.bitcoin.ninja/checkscript?savedScript=35f2a93c-ab9c-4bb0-8770-fba39c666234

05:20 <NicolasDorier> Bob and Alice signing http://n.bitcoin.ninja/checkscript?savedScript=2ebb22e6-416b-4509-91d4-5cbe4d501ccf

05:21 <NicolasDorier> this new 2 by 2 escrow with timeout save quite a lot

05:21 <NicolasDorier> around 33 bytes

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05:23 <NicolasDorier> actually can do better

05:23 <NicolasDorier> https://www.irccloud.com/pastebin/HTlADT5o/

05:25 <NicolasDorier> Alice + Bob : http://n.bitcoin.ninja/checkscript?savedScript=2c36bfb0-bc8c-4ea1-8a4c-c3d36ee01abc

05:25 <NicolasDorier> Bob + Timeout: http://n.bitcoin.ninja/checkscript?savedScript=65a8c824-1d9a-489c-9f91-4263233e91ff

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05:43 <arubi> NicolasDorier, can alice grab bob's signature from the timeout redemption in flight and use it to redeem the 2-of-2 case (signing the same tx as bob did)? I think bob's sighash should be the same because the checksig is after the separator

05:44 <NicolasDorier> arubi: no she can't. The scriptCore used for the timeout is not the same as the one used for the 2-2

05:44 <arubi> but she only has to sign the 2-of-2 with the same locktime no?

05:45 <NicolasDorier> what do you mean ? The script Code for bob in case of 2-2 is "OP_ELSE 0 OP_CLTV OP_DROP OP_ENDIF OP_CHECKSIG"

05:45 <NicolasDorier> the last OP_CHECKSIG verify bob

05:45 <NicolasDorier> in both case

05:46 <NicolasDorier> she would have been able if the OP_CHECKSIGVERIFY was bob

05:46 <arubi> oh yea, I got confused with how checksig looks for codeseps, it's up to the last one

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05:47 <arubi> right, thanks. very cool use of codesep.

05:48 <NicolasDorier> I think I will change my implementation of TB for using this. It is around 66 bytes saved for each tumbling

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05:48 <NicolasDorier> I don't see any downside

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13:50 <waxwing> fixed points in sha256? https://crypto.stackexchange.com/questions/48580/self-collisions-in-sha256#48580

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16:14 <kewde[m]> NicolasDorier: I don't think there is any reason other than keeping it simple, for use as an example. I believe it was introduced as an example for CLTV.

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