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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<NicolasDorier> Question: is there any reason why a 2 by 2 escrow with timeout is always designed like
<NicolasDorier> You can achieve same thing by saving 33 bytes
<NicolasDorier> with
<NicolasDorier> using the OP_CODESEPARATOR
<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 ?
<NicolasDorier> I wrote the difference between both on my script evaluator for anyone who wants to look it
<NicolasDorier> Before:
<NicolasDorier> After:
<NicolasDorier> this new 2 by 2 escrow with timeout save quite a lot
<NicolasDorier> around 33 bytes
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<NicolasDorier> actually can do better
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<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
<NicolasDorier> arubi: no she can't. The scriptCore used for the timeout is not the same as the one used for the 2-2
<arubi> but she only has to sign the 2-of-2 with the same locktime no?
<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"
<NicolasDorier> the last OP_CHECKSIG verify bob
<NicolasDorier> in both case
<NicolasDorier> she would have been able if the OP_CHECKSIGVERIFY was bob
<arubi> oh yea, I got confused with how checksig looks for codeseps, it's up to the last one
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<arubi> right, thanks. very cool use of codesep.
<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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<NicolasDorier> I don't see any downside
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<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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