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 51 2017-04-11T06:36:16  <samlewis> Anyone around that has a reasonable understanding of asicboost? I've read through the paper and the 20% efficiency gain that is spouted everywhere seems grossly overstated.. it might just be that I don't understand the power of asics though, would love to talk it through.
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100 2017-04-11T11:49:36  <instagibbs> http://www.mit.edu/~jlrubin//public/pdfs/Asicboost.pdf is a pretty decent explainer
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118 2017-04-11T13:06:53  <comboy> do I understand correctly that sighash type is extracted as the last byte of the signature? and that it can have like 6 different values? if so why there's a lot of big integeres as sighash type here: https://raw.githubusercontent.com/bitcoin/bitcoin/master/src/test/data/sighash.json ?
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121 2017-04-11T13:19:03  <jonasschnelli> comboy: the sighash-type is appended to the sighash-serialized tx... its a uint32 (4 bytes)
122 2017-04-11T13:20:09  <jonasschnelli> that's done before hashing (the appending)
123 2017-04-11T13:20:12  <comboy> jonasschnelli: right, but if it's a single byte, how can it ever be more than 255 in reality?
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125 2017-04-11T13:20:31  <jonasschnelli> comboy: it's not a single byte.. it's 4 bytes.
126 2017-04-11T13:20:45  <jonasschnelli> But I guess we currently support 4 different bits
127 2017-04-11T13:20:55  <comboy> jonasschnelli: you are appending it as 4 bytes, but you take it from the last byte of the sig, right?
128 2017-04-11T13:20:55  <jonasschnelli> SIGHASH_ALL, SIGHASH_NONE, SIGHASH_SINGLE, SIGHASH_ANYONECANPAY
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130 2017-04-11T13:21:22  <jonasschnelli> comboy: no.. I'm not aware that it would have something to do with the sig
131 2017-04-11T13:22:09  <comboy> https://github.com/bitcoin/bitcoin/blob/8152d3fe57a991e9088d0b9d261d2b10936f45a9/src/script/interpreter.cpp#L118
132 2017-04-11T13:22:12  <jonasschnelli> 1. serialize the tx for sighash (some special serialisation), append the sighash-type uin32t, double_sha256 and -> hash for ecdsa
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134 2017-04-11T13:24:05  <comboy> here it says 1-byte, can it come from anywhere else?
135 2017-04-11T13:24:59  <jonasschnelli> hmm... checking...
136 2017-04-11T13:27:04  <jonasschnelli> comboy: Oh. Yes. I was looking at the compact signatures... the broadcasted DER encoded signatures have a single SIGHASH-TYPE byte at the end.
137 2017-04-11T13:28:37  <jonasschnelli> https://github.com/bitcoin/bitcoin/blob/8152d3fe57a991e9088d0b9d261d2b10936f45a9/src/script/sign.cpp#L34
138 2017-04-11T13:29:34  <jonasschnelli> comboy: the SignatureHash hashes over the serilaized tx and the sighash-type (4bytes),... but the DER encoded signatures have a 1byte sig-hash-type at the end
139 2017-04-11T13:30:08  <comboy> right, so even though we append it as 4 bytes, the sighash value is always a single byte value, correct?
140 2017-04-11T13:31:19  <jonasschnelli> comboy: Yes. Correct,... BIP66 and the DER encoding can't handle more.
141 2017-04-11T13:31:29  <jonasschnelli> The sighash can internally handle 32 bits.
142 2017-04-11T13:31:40  <comboy> jonasschnelli: so then we are back to my original question
143 2017-04-11T13:32:27  <jonasschnelli> let me check...
144 2017-04-11T13:32:59  <jonasschnelli> The test you have linked above is only the sighash test... that test has nothing to do with DER encoding (the last 1 byte)
145 2017-04-11T13:33:09  <jonasschnelli> It only cover how the tx gets hased before signing
146 2017-04-11T13:33:15  <jonasschnelli> There it's always 4 bytes
147 2017-04-11T13:34:36  <comboy> right.. but why test inputs that can never appear in reality and the fact that they can be currently present is only because of specifics of the current implementation? I'm not talking about signing, I understand there's 4 bytes there, maybe we'll use them one day maybe not, I'm just talking about this test data
148 2017-04-11T13:35:31  <jonasschnelli> yes... this is indeed strange
149 2017-04-11T13:36:22  <comboy> jonasschnelli: ok iif you find it's strange that's reassuring, I thought that maybe I'm understanding something wrong
150 2017-04-11T13:36:42  <jonasschnelli> comboy: I'm looking now into this... I guess there is a reason why
151 2017-04-11T13:37:40  <comboy> jonasschnelli: thanks, need to go afk for now but thanks for your time
152 2017-04-11T13:38:03  <jonasschnelli> np... will response here if I have found something
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177 2017-04-11T16:19:58  <arubi> I think hybrid pubkeys don't have to adhere to strictder ?
178 2017-04-11T16:20:15  <arubi> might be able to use the extended range with that
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252 2017-04-11T23:41:22  <comboy> re this test file, I guess it was just completely randomly generated, including these integers, scripts there don't make any sense just some randnom opcodes e.g. ""OP_CHECKSIG 2 OP_CHECKSIG OP_VERIF OP_CHECKSIG OP_VERIF OP_CHECKSIG 1", it's not testing any edge cases or anything
253 2017-04-11T23:43:23  <comboy> I guess it still is of some use, although alternative implementations which include it hoping to match bitcoin core behavior may be a bit dissapointed
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