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11:46 < stevenroose> Does anyone know by heart the minimal DER serialized signature size and the probability of a random key signing with that size?
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11:47 < stevenroose> Does anyone know by heart the minimal DER serialized signature size and the probability of a random key signing with that size?
11:47 < stevenroose> Not sure my msg got through yet, just connected to wifi, will try once more..
11:47 < stevenroose> Does anyone know by heart the minimal DER serialized signature size and the probability of a random key signing with that size?
11:48 < stevenroose> I never really realized this, but I think this might be the reason our functionary wallet fee estimation often has an off-by-one in weight estimation. Because signatures aren't fixed size.. And the sighash actually commits to the change amount,
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11:55 < stevenroose> I seem to observe 70 and 71 bytes kinda same frequency
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11:59 < stevenroose> For 100,000 signatures: {71: 49566, 70: 50024, 68: 2, 69: 408}
11:59 < stevenroose> 2 in 100k are 68 bytes? :D That means 50k signatures grinding on average to get there, that might be overkill. Seems like best way to get determinism is actually going for 71..
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12:18 < andytoshi> stevenroose: the minimum size is 12 or something and the probability is 2^-128 or something
12:18 < andytoshi> in practice the minimal size can be achieved by using the 1/2 point as R and grinding out the messagehash to get 4 or 5 zero bytes in s
12:44 < stevenroose> I went with 70 :)
12:53 < andytoshi> yeah, if the functionary is expecting signatures to be a fixed size, DER is gonna cause weirdness
12:53 < andytoshi> you'll lose a byte with probability 1/256
12:53 < andytoshi> which i think is just rare enough to be an obscure bug :P
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16:30 < nsh> the best kind
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--- Log closed Fri Jul 28 00:00:12 2023