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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<maaku>
batch
<maaku>
andytoshi sipa: low-s shouldn't get in the way of batch validation, as you can require low-s AND R.y be a quadratic residue
<maaku>
you'd have to modify deterministic signing to support this though
<maaku>
the annoying thing about restrictions on R.y as a tie breaker is that it isn't easy to check without verifying the signature
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<andytoshi>
if you required low-s and R.y quadratic that would burn coins that were controlled solely by old signers
<andytoshi>
i'm not sure what you mean by "checking without verifying the signature", you only ever need to check it when you're verifying
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<maaku>
andytoshi: how would it burn coins? 25% of nonces would generate low-s, R.y quadratic signatures
<maaku>
andytoshi: "you only ever need to check it when you're verifying" this is incorrect, low-s is an IsStandard check prior to signature verification
<maaku>
wait, no, I was confused. it's only checked in context. naturally as that's when you have the scripts
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<andytoshi>
hmmm, maybe it wouldn't burn them if you had a signing device that you could cajole into signing different txes with the same input
<andytoshi>
and just try until you got a valid nonce
<andytoshi>
but if you had coins controlled only by a locktime tx, you'd be SOL
<andytoshi>
i see what you're saying about checking in IsStandard. yeah, that's annoying, it makes the extra bit in the R encoding purely redundant data that needs to be verified.
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<maaku>
well it would be a far-worse outcome if it was a no-context IsStandard check
<maaku>
but it's not, because you need context to even know that a stack item is a signature
<andytoshi>
hmm, yeah, gross
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