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 90 2016-03-27T11:22:01  <GitHub99> [bitcoin] laanwj opened pull request #7751: test_framework: python3.4 authproxy compat (master...2016_03_authproxy_py3compat) https://github.com/bitcoin/bitcoin/pull/7751
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104 2016-03-27T13:58:31  <miniwantyougone> free private key for 1 btc: L1jHtEcxdsjdD43AhstSXww2vwZyTVaf5nKHtqPAUrPSp3HAvBVr
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110 2016-03-27T14:22:59  <sipa> i generally see a trend that the number of transactions in a mempool increases, but the number of inputs stays the same over time
111 2016-03-27T14:23:14  <sipa> indicating that larger transactions disappear faster?
112 2016-03-27T14:41:26  <Chris_Stewart_5> How does bitcoin core handle the behavior of an undefined hash type for an OP_CHECKSIG op code? Is it just ignored if it isn't a predefined hash type?
113 2016-03-27T14:41:49  <sipa> it's non-standard, so such transactions don't get relayed
114 2016-03-27T14:41:55  <sipa> however, inside the blockchain they are valid
115 2016-03-27T14:42:28  <sipa> the different hashtype behaviours are tested by testing certain bits set in the hashtype, and some bits are ignored
116 2016-03-27T14:43:21  <Chris_Stewart_5> so for testing this signature 0x304402206177d513ec2cda444c021a1f4f656fc4c72ba108ae063e157eb86dc3575784940220666fc66702815d0e5413bb9b1df22aed44f5f1efb8b99d41dd5dc9a5be6d205205 would the '05' at the end be ignored?
117 2016-03-27T14:44:26  <sipa> https://github.com/bitcoin/bitcoin/blob/v0.12.0/src/script/interpreter.cpp#L991
118 2016-03-27T14:44:35  <sipa> the 3 lines there determine the behaviour
119 2016-03-27T14:45:00  <sipa> 05 would be treated the same as 01
120 2016-03-27T14:46:15  <Chris_Stewart_5> is that what it defaults to since there isn't a fSigHashAll?
121 2016-03-27T14:46:43  <sipa> 01 causes fAnyoneCanPay=false fHashSingle=false fHashNone=false
122 2016-03-27T14:46:51  <Chris_Stewart_5> yeah
123 2016-03-27T14:46:52  <sipa> so does 05, so it is treated the same way
124 2016-03-27T14:47:09  <sipa> there are really just 6 different behaviours
125 2016-03-27T14:47:20  <sipa> (as fHashSingle and fHashNone are never both true)
126 2016-03-27T14:47:54  <Chris_Stewart_5> no 'undefined' behavior so to speak, is the SIGHASH_ALL sort of of a catch all clause in case that none of the flags above are set?
127 2016-03-27T14:48:18  <sipa> yes, SIGHASH_ALL is just the absence of any of the others
128 2016-03-27T14:49:01  <Chris_Stewart_5> also what you were saying about mempool size increasing with the input set staying the same size is interesting. Not sure how you came to the conclusion that larger txs disappear faster though
129 2016-03-27T14:49:30  <Chris_Stewart_5> what does the quantifier large mean? Large in terms of bytes? Output size in terms of coins?
130 2016-03-27T14:49:37  <sipa> in bytes
131 2016-03-27T14:50:25  <sipa> as the mempool is limited in size (bytes), but the number of transactions grows, it means that the average size of transactions goes down
132 2016-03-27T14:50:51  <Chris_Stewart_5> Is the mempool size fixed within bitcoin core or is it limited by the amount of RAM on the node's machine?
133 2016-03-27T14:51:59  <sipa> it's configured with the -maxmempool=N option, where N is in megabytes of RAM
134 2016-03-27T14:52:04  <sipa> and its defaults to 300
135 2016-03-27T14:54:24  <Chris_Stewart_5> So it seems to me that you are inferring as the mempool limit is reached users are purposefully creating smaller transactions to try and have them included in the mempool?
136 2016-03-27T14:54:32  <sipa> no
137 2016-03-27T14:55:00  <sipa> the mempool is typically always full these days; transactions are just replaced when higher fee ones come in
138 2016-03-27T14:56:44  <sipa> and the mempool is different for each node (though there is a strong correlation, of course), but you can't say that "the mempool limit is reached"; it's reached individually for every node independently at different times, depending on what transactions they've seen, and how it's configured
139 2016-03-27T14:59:20  <Chris_Stewart_5> Could people that are building larger transactions simply have better software to calculate fees? You say 'disappear faster' which i'm assuming just means confirmed?
140 2016-03-27T15:00:06  <sipa> what i'm seeing shows the opposite: that smaller transactions perhaps have higher feerates in general, so they replace the larger ones
141 2016-03-27T15:03:28  <Chris_Stewart_5> or does 'disappear faster' mean get kicked out of the mempool?
142 2016-03-27T15:03:55  <sipa> i don't know :)
143 2016-03-27T15:04:04  <sipa> can be either
144 2016-03-27T15:04:16  <Chris_Stewart_5> damn you and your open ended questions :-)
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155 2016-03-27T16:29:33  <GitHub54> [bitcoin] laanwj opened pull request #7753: zmq: mempool notifications (master...2016_03_zmq_mempool_notifications) https://github.com/bitcoin/bitcoin/pull/7753
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