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 542018-09-17T07:03:10  <promag> should release notes about scantxoutset also include something more detailed about output descriptions?
 552018-09-17T07:03:32  <promag> *descriptors
 562018-09-17T07:03:35  <promag> or is it enough to link doc/descriptors.md?
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 652018-09-17T07:48:30  <hebasto> The *gui* prefix is not mentioned in the CONTRIBUTING.md. Is it valid? If "yes", what is difference between "gui" and "qt" prefixes?
 662018-09-17T07:51:36  <sipa> "prefix" ?
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 682018-09-17T08:07:44  <ken2812221_> IMO they are the same, not sure what you mean "valid".
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 742018-09-17T08:59:33  <jl2012> currently, if the script engine need to change the value of a stack element, it will first pop the element and push back the new one. Would it be more efficient if we directly assign the new value to stack.back(), instead of doing pop and push?
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 782018-09-17T09:15:03  <promag> wumpus: pls see my question above
 792018-09-17T09:26:42  <hebasto> sipa: I mean PR title prefix (e.g. "wallet", "docs", "trivial" and so on).
 802018-09-17T09:31:37  <hebasto> ken2812221_: I use term "valid" as it is used in https://github.com/bitcoin/bitcoin/blob/master/CONTRIBUTING.md#contributor-workflow Cite: "The title of the pull request should be prefixed by the component or area that the pull request affects. Valid areas as: ..."
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 862018-09-17T10:53:19  <wumpus> pierre_rochard: awesome!
 872018-09-17T10:53:57  <wumpus> promag: i'd say, link to the document, an actual, maintained, document is so much better than a description in the release notes
 882018-09-17T10:54:19  <wumpus> promag: we've been kind of abusing the release notes as documentation for new features but it's not something to be encouraged
 892018-09-17T10:54:39  <promag> wumpus: agree on that
 902018-09-17T10:55:11  <promag> release notes should just say, this was added/changed/removed and see /this.md for more details
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 922018-09-17T10:56:08  <wumpus> yes, most useful is if it has a short description of what changed, with a link for information (or, say, a command to run) for details on how to use it
 932018-09-17T10:56:39  <wumpus> 'refer to the RPC help for this command' is also enough for many things
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 952018-09-17T11:07:27  <promag> wumpus: scantxoutset is experimental so I wouldn't detail that much in the release notes
 962018-09-17T11:07:42  <wumpus> hebasto: you can use either; in a strict sense, gui is more general and would also other kinds of graphical interfaces than the qt one, but there are none within our source tree so it can't be a source of confusion
 972018-09-17T11:08:41  <wumpus> (in any case, my release-notes-pull-request-list script is smart enough to regard all these prefixes, say [qt] qt: [gui] gui: even [gui]: as the same)
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 992018-09-17T11:09:29  <wumpus> promag: just do mention that it's experimental, then :)
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1082018-09-17T11:59:48  <Jmabsd> What (bignum) integer unit is used in the total work done calculation?
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1142018-09-17T12:19:58  <hebasto> wumpus: thank you
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1402018-09-17T14:38:43  <sipa> Jmabsd: we have arith_uint256
1412018-09-17T14:39:23  <Jmabsd> sipa: so 256bit is always enough for the sum of all of them?
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1462018-09-17T14:47:54  <luke-jr> I think we'd have a serious problem if it wasn't?
1472018-09-17T14:48:13  <luke-jr> that would basically mean SHA2 is broken?
1482018-09-17T14:48:20  <luke-jr> (completely)
1492018-09-17T14:48:41  <sipa> Jmabsd: yes, counting to 2^128 costs more energy than boiling the earth's oceans :)
1502018-09-17T14:49:01  <sipa> 2^256 should suffice for a while :)
1512018-09-17T14:49:03  <luke-jr> sipa: to be fair, we're not counting :P
1522018-09-17T14:49:18  <luke-jr> at least not by small numbers
1532018-09-17T14:51:13  <Jmabsd> interesting.
1542018-09-17T14:51:17  <sipa> luke-jr: well the chainwork variable is counting an estimate for how many sha256 operations have been performed
1552018-09-17T14:51:28  <Jmabsd> up to what block height will the 256bit uint suffice? :)
1562018-09-17T14:51:35  <Jmabsd> it *does* help that the block hash is constantly approaching zero. :)
1572018-09-17T14:52:08  <sipa> Jmabsd: you're worrying about highly theoretical problems
1582018-09-17T14:52:23  <luke-jr> sipa: oh, that's a good point
1592018-09-17T14:52:51  <luke-jr> Jmabsd: forever, considering what sipa pointed out
1602018-09-17T14:53:04  <sipa> Jmabsd: the answer could be "not within the age of the universe" if classical computation limits hold, or "milliseconds" under the existence of unbounded quantum computers
1612018-09-17T14:53:31  <luke-jr> since it's based on target and not the block hash, even a lucky block hash wouldn't skew the estimate much
1622018-09-17T14:53:38  <luke-jr> s/much/at all/
1632018-09-17T14:54:32  * luke-jr wonders if the time warp attack thing would make it possible to overflow
1642018-09-17T14:54:34  <luke-jr> probably not
1652018-09-17T14:55:20  <sipa> no even with a tike warp attack the chainwork variable remains a truthful esrimate
1662018-09-17T14:58:11  <mryandao> what are good ways to record timing events for specific functions in bitcoin without using events (but a clock timer) instead?
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1682018-09-17T15:03:58  <sipa> mryandao: i don't understand; what does "recording timing events" mean?
1692018-09-17T15:04:28  <mryandao> sorry, let me try again. Recording the time difference between the start and end of a function.
1702018-09-17T15:05:10  <mryandao> i read chrono and then flushing it to a file is not precise.
1712018-09-17T15:05:19  <mryandao> s/chrono/using chrono/
1722018-09-17T15:06:45  <sipa> mryandao: we have a GetTimeMicros function
1732018-09-17T15:06:54  <sipa> call it once before and once after
1742018-09-17T15:07:21  <sipa> the difference is the duration in microseconds
1752018-09-17T15:08:59  <booyah> Jmabsd: mostl likelly it would take 2258740816895212925709483946018412684403674794507657694277808676808542634 years, 30 days, 17 hours, 3 minutes and 1 second, sir
1762018-09-17T15:20:01  <luke-jr> exactly 1 second? /s
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2462018-09-17T19:29:55  <gmaxwell> a47344b7dceddff6c6cc1c7e97f1588d99e6dba706011b6ccc2e615b88fe4350
2472018-09-17T19:34:21  <midnightmagic> timestamped as of 19:34-ish UTC Sep 17 2018..
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2532018-09-17T19:59:40  <gmaxwell> midnightmagic: danke
2542018-09-17T20:01:06  <midnightmagic> \o
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2722018-09-17T22:32:01  <promag> sipa: jonasschnelli: https://github.com/bitcoin-core/bitcoin-devwiki/wiki/0.17.0-Release-notes/_compare/63aaedbdba2ce296480069a6457ba80629b25a38
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2822018-09-17T23:22:35  <wumpus>  * [new tag]                                                                           v0.17.0rc4 -> v0.17.0rc4
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2852018-09-17T23:44:00  <achow101> \o/
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2892018-09-17T23:49:02  <sipa> promag: tha ks!
2902018-09-17T23:49:26  <sipa> perhaps we can also replace part of the psbt description in the release notes with a reference to the docs
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2922018-09-17T23:56:02  <promag> sipa: indeed, most of the psbt notes are in doc/psbt.md
2932018-09-17T23:56:49  <sipa> i know, they were copied from there
2942018-09-17T23:57:05  <sipa> which is fine... but 0erha0s the description in the release notes is a bit too long