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 26 2020-07-31T00:52:36  <bitcoin-git> [bitcoin] fanquake pushed 2 commits to master: https://github.com/bitcoin/bitcoin/compare/edec7f7c2542...a4a279b4f368
 27 2020-07-31T00:52:36  <bitcoin-git> bitcoin/master e60ef21 fanquake: doc: Clang 8 or later is required with FORCE_USE_SYSTEM_CLANG
 28 2020-07-31T00:52:37  <bitcoin-git> bitcoin/master a4a279b fanquake: Merge #19617: doc: Clang 8 or later is required with FORCE_USE_SYSTEM_CLAN...
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 31 2020-07-31T00:52:56  <bitcoin-git> [bitcoin] fanquake merged pull request #19617: doc: Clang 8 or later is required with FORCE_USE_SYSTEM_CLANG (master...note_that_clang_8_is_required_with_force_system_clang) https://github.com/bitcoin/bitcoin/pull/19617
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 51 2020-07-31T01:50:08  <bitcoin-git> [bitcoin] Empact opened pull request #19632: test: Catch decimal.InvalidOperation from TestNodeCLI#send_cli (master...2020-07-send_cli-invalid-op) https://github.com/bitcoin/bitcoin/pull/19632
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 65 2020-07-31T02:59:33  <bitcoin-git> [bitcoin] kallewoof closed pull request #14582: wallet: always do avoid partial spends if fees are within a specified range (master...181026-try-avoidpartialspends) https://github.com/bitcoin/bitcoin/pull/14582
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 69 2020-07-31T03:00:23  <bitcoin-git> [bitcoin] kallewoof closed pull request #16653: script: add simple signature support (checker/creator) (master...2019-08-genpursigs) https://github.com/bitcoin/bitcoin/pull/16653
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 95 2020-07-31T05:53:56  <bitcoin-git> [bitcoin] MarcoFalke pushed 2 commits to master: https://github.com/bitcoin/bitcoin/compare/a4a279b4f368...a63a26f04213
 96 2020-07-31T05:53:56  <bitcoin-git> bitcoin/master ae4958b Chris L: rpc: RPCResult Type of MempoolEntryDescription should be OBJ. If multiple ...
 97 2020-07-31T05:53:57  <bitcoin-git> bitcoin/master a63a26f MarcoFalke: Merge #19585: rpc: RPCResult Type of MempoolEntryDescription should be OBJ...
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100 2020-07-31T05:54:16  <bitcoin-git> [bitcoin] MarcoFalke merged pull request #19585: rpc: RPCResult Type of MempoolEntryDescription should be OBJ. (master...19579) https://github.com/bitcoin/bitcoin/pull/19585
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110 2020-07-31T06:39:30  <bitcoin-git> [bitcoin] MarcoFalke closed pull request #19098: test: Remove duplicate NodeContext hacks (master...pr/qtx) https://github.com/bitcoin/bitcoin/pull/19098
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113 2020-07-31T06:39:50  <bitcoin-git> [bitcoin] MarcoFalke reopened pull request #19098: test: Remove duplicate NodeContext hacks (master...pr/qtx) https://github.com/bitcoin/bitcoin/pull/19098
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116 2020-07-31T06:50:17  <MarcoFalke> The meeting could toggle between two times, so everyone could at least attend every other meeting
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132 2020-07-31T08:21:38  <jonatack> i'm interested in these meetings (core dev weekly, wallet, p2p, review club) but they are currently during sleep hours, which made for grouchy participation and low productivity the next day... i concluded it's best to abstain ;)
133 2020-07-31T08:23:42  <jonatack> I like MarcoFalke's suggestion to toggle between two times
134 2020-07-31T08:35:04  <jonatack> at any rate, I read the logs to catch up the next day :)
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180 2020-07-31T11:52:54  <bitcoin-git> [bitcoin] fanquake pushed 8 commits to master: https://github.com/bitcoin/bitcoin/compare/a63a26f04213...f7c73b03d975
181 2020-07-31T11:52:55  <bitcoin-git> bitcoin/master d362f19 Pieter Wuille: doc: list support for BIP 339 in doc/bips.md
182 2020-07-31T11:52:55  <bitcoin-git> bitcoin/master 9efd86a Pieter Wuille: refactor: add GenTxid (=txid or wtxid) type and use it for tx request logic
183 2020-07-31T11:52:56  <bitcoin-git> bitcoin/master 900d7f6 Pieter Wuille: p2p: enable fetching of orphans from wtxid peers
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186 2020-07-31T11:53:14  <bitcoin-git> [bitcoin] fanquake merged pull request #19569: Enable fetching of orphan parents from wtxid peers (master...202007_wtxid_followup) https://github.com/bitcoin/bitcoin/pull/19569
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188 2020-07-31T11:55:01  <jnewbery> I'm pretty against having an alternating meeting time for a couple of reasons:
189 2020-07-31T11:55:10  <jnewbery> 1) it's confusing. People will inevitably show up at the wrong time on the wrong day or miss meetings and get annoyed.
190 2020-07-31T11:55:20  <jnewbery> 2) I'd need to find a host for the opposite time meeting. In my experience from PR review club, people are keen to host one or two and then lose interest.
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196 2020-07-31T12:05:48  <bitcoin-git> [bitcoin] laanwj pushed tag v0.20.1: https://github.com/bitcoin/bitcoin/compare/v0.20.1
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198 2020-07-31T12:06:07  <hebasto> \o/
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200 2020-07-31T12:06:08  <bitcoin-git> [bitcoin] laanwj pushed 1 commit to 0.20: https://github.com/bitcoin/bitcoin/compare/6acb21e724e3...7ff64311bee5
201 2020-07-31T12:06:08  <bitcoin-git> bitcoin/0.20 7ff6431 Wladimir J. van der Laan: build: Bump version to 0.20.1-final
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203 2020-07-31T12:06:31  <wumpus> yes, I think that's also why the main meeting was never changed to alternating times, even though it was considered a few times
204 2020-07-31T12:08:30  <wumpus> btw, we don't even mention the wallet meeting yet on https://bitcoincore.org/en/meetings/, would make sense to do so, or at least have a page that mentions all the meetings in one place
205 2020-07-31T12:09:42  <wumpus> could also link to the PR review meetings
206 2020-07-31T12:14:48  <wumpus> and the 2018- meeting summaries could move to something like 'historical meeting summaries'
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213 2020-07-31T12:57:31  <aj> jnewbery: "people will .. miss meetings and get annoyed" oh, look, there's the box i'm in
214 2020-07-31T13:01:37  <jonatack> jnewbery: lately there's almost been a surplus of review club hosts? slots backed up, etc, not including others who might be interested in hosting at a different time
215 2020-07-31T13:03:41  <jonatack> anyway... in general (not just the review club) it may be worthwhile to try and see if people are confused by alternating slots.
216 2020-07-31T13:04:39  <jonatack> the benefit might be a greater diversity of input at the meetings. geographic diversity is interesting. but i won't go on further about it.
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226 2020-07-31T13:12:18  * troygiorshev proposes to randomize the time each week so that people are forced to check when it is
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228 2020-07-31T13:15:55  <jonatack> :D
229 2020-07-31T13:38:15  <provoostenator> hebasto beat me to it by 17 minutes for Gitian signatures. I should automate the PR part...
230 2020-07-31T13:38:38  <hebasto> still using LXC :)
231 2020-07-31T13:39:16  <provoostenator> Oh it was done much earlier; I just didn't watch the terminal window
232 2020-07-31T13:39:33  <hebasto> provoostenator: have you already automate tagging part?
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240 2020-07-31T14:04:01  <jonatack> If anyone wants to build gitian sigs for the first time for 0.20.1, I just updated this guide: https://github.com/jonatack/bitcoin-development/blob/master/gitian-building.md
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255 2020-07-31T15:06:55  <emzy> provoostenator: I had to delete gitian-builder/cache to get the hash of MacOSX10.14.sdk.tar.gz right and compile again. But you are faster anyway.
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258 2020-07-31T15:36:57  <provoostenator> hebasto: no automation, but I highlight "pushed tag" on IRC (ht achow101)
259 2020-07-31T15:37:10  <achow101> automation is hard
260 2020-07-31T15:37:33  <provoostenator> Also probably not ideal to automate, in case someone kidnaps me just before an evil release
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263 2020-07-31T16:11:57  <hebasto> provoostenator :D
264 2020-07-31T16:13:22  <hebasto> agree, automated gitian builds as well as automated client updates are not for bitcoin
265 2020-07-31T16:15:15  <hebasto> anyway kidnapping has no point as an adversary has no ability to *sign* your gitian builds
266 2020-07-31T16:19:55  <jnewbery> jonatack: there hasn't been a surplus of review club hosts. I'm always looking for people to volunteer to host.
267 2020-07-31T16:20:09  <jnewbery> I think maybe you underestimate the effort required to make sure this thing runs regularly.
268 2020-07-31T16:20:59  <jnewbery> I'm very open to other people hosting review club meetings for different time zones. My experience has been that people don't stick with it for very long.
269 2020-07-31T16:21:56  <jonatack> jnewbery: indeed, i reckoned i was underestimating that. it may have been a one-off backlog.
270 2020-07-31T16:22:42  <jnewbery> It's not a backlog. I schedule hosts in advance to make sure that we always have something lined up
271 2020-07-31T16:23:57  <jonatack> jnewbery: i'm not convinced that second meetings are very exciting for people. i don't think alternate times for the main meeting have been tried.
272 2020-07-31T16:25:31  <jnewbery> there are many people who join every week at 17:00 UTC on weds because that's part of their schedule. I'm not going to stop holding meetings at that time. I'm very open to you or anyone else holding a meeting at a time that's more suitable for other time zones though.
273 2020-07-31T16:26:01  <jonatack> that said, i don't want to be overbearing about mono-meeting times and i'm happy with reading the logs the next day and learning from them.
274 2020-07-31T16:26:30  <jnewbery> I think we're offtopic here. If you want to discuss more, let's use #bitcoin-core-pr-reviews
275 2020-07-31T16:27:21  <jonatack> my point was about the diversity of input at meetings in general, not only review club.
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279 2020-07-31T16:31:08  <jnewbery> ok. I just wanted to make sure that people in this room didn't think that we have a surplus of hosts. I'm always looking for hosts, and I think everyone who's done it has found it a worthwhile use of their time.
280 2020-07-31T16:31:48  <jonatack> +1
281 2020-07-31T16:34:42  <jonatack> if anyone is curious, here are the people who have hosted review clubs so far: https://bitcoincore.reviews/meetings-hosts
282 2020-07-31T16:35:58  <pinheadmz> thats cool jonatack !
283 2020-07-31T16:39:45  <achow101> provoostenator: osx mismatch, did you clear your gitian cache?
284 2020-07-31T16:39:55  <achow101> - 61a385c6836240224dafa06f19c0f5b9bea1215852c318fd6bd1e2f7baeb856e  bitcoin-0.20.1-osx-unsigned.tar.gz
285 2020-07-31T16:39:55  <achow101> + fdffff0e6b956ffa51b0a01f04b9e9cff2a658589116a911c322a94855feeeac  bitcoin-0.20.1-osx-unsigned.tar.gz
286 2020-07-31T16:40:03  <provoostenator> I didn't, which incantation?
287 2020-07-31T16:40:32  <achow101> rm -r gitian-builder/cache
288 2020-07-31T16:40:34  <provoostenator> And did my 0.20.1rc1 build also mismatch?
289 2020-07-31T16:41:00  <achow101> yes, mismatch for rc1 too
290 2020-07-31T16:41:00  <provoostenator> Doing a new build, will make another PR with that.
291 2020-07-31T16:41:34  <provoostenator> Did we backport the SDK upgrade?
292 2020-07-31T16:41:39  <provoostenator> Or is this an unrelated problem?
293 2020-07-31T16:41:52  <achow101> unrelated
294 2020-07-31T16:42:01  <jonatack> achow101: when is that spell needed? have never cleared the cache
295 2020-07-31T16:42:43  <achow101> jonatack: usually it isn't needed as the cache should clear/not be used when a dependency updates
296 2020-07-31T16:43:19  <achow101> but somtimes a dependency's binary will change because some build tooling changes and that makes cached builds vs non-cached builds differ
297 2020-07-31T16:43:35  <achow101> so in those cases (like now) it's just easier to ask everyone to clear their cache before building so we all arrive at the same result
298 2020-07-31T16:43:46  <jonatack> ok thanks
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302 2020-07-31T17:06:22  <provoostenator> Oh I guess I didn't have to rebuild Linux and Windows...
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308 2020-07-31T17:35:43  <bitcoin-git> [bitcoin] justinmoon opened pull request #19634: rpc: Document getwalletinfo's unlocked_until field as optional (master...getwalletinfo) https://github.com/bitcoin/bitcoin/pull/19634
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312 2020-07-31T17:47:30  <jeremyrubin> hebasto: for #18710 do you have a plan to get cross platform testing? It might help to ask some specific people to run benches. But also if you read the article that I shared on boost:: vs std:: it's unclear that our current bench would even capture it...
313 2020-07-31T17:47:33  <gribble> https://github.com/bitcoin/bitcoin/issues/18710 | Add local thread pool to CCheckQueue by hebasto · Pull Request #18710 · bitcoin/bitcoin · GitHub
314 2020-07-31T17:48:16  <jeremyrubin> hebasto: I think what you might want to add is a new bench which is just testing different threading primitives out, and show there's no regression there?
315 2020-07-31T17:48:51  <jeremyrubin> I can also send the article to martinus and ask if there are any features in nanobench that can help diagnose such a regression
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320 2020-07-31T18:17:07  <hebasto> jeremyrubin: which threading primitives do you mean for benchmarking?
321 2020-07-31T18:17:45  <provoostenator> OTOH wiping the cache changed some linux details too
322 2020-07-31T18:17:48  <hebasto> yes, martinus' help would be valuable
323 2020-07-31T18:18:43  <provoostenator> (but not the end result)
324 2020-07-31T18:19:27  <sipa> figure out how to turn of cpu frequency scaling if you benchmark
325 2020-07-31T18:20:07  <sipa> on my laptop's i7 cpu that means booting with intel_pstate=disable on the kernel command line
326 2020-07-31T18:20:56  <hebasto> some tools are mentioned here https://wiki.archlinux.org/index.php/CPU_frequency_scaling
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328 2020-07-31T18:31:36  <jeremyrubin> from martinus:
329 2020-07-31T18:31:47  <jeremyrubin> Hi, I think a good way to expose variance is to reduce the number of iterations. Usually nanobench tries to find a reasonable number of iterations depending on clock accuracy, but running many iterations per measurement means that it will become smoothed. So I'd do something like this:
330 2020-07-31T18:32:12  <jeremyrubin> ankerl::nanobench::Bench().epochIterations(1).epochs(10000).run(
331 2020-07-31T18:32:14  <jeremyrubin>         "expose variance", [&] { /* whatever */ });
332 2020-07-31T18:32:20  <jeremyrubin> that forces only a single iteration per measurement(epoch), so this maximizes variance. The disadvantage is that time measurements will be less accurate.
333 2020-07-31T18:32:36  <jeremyrubin> To visualize the fluctiation you can generate boxplots:
334 2020-07-31T18:32:37  <jeremyrubin>     std::ofstream html("out.html");
335 2020-07-31T18:32:38  <jeremyrubin>     bench.render(ankerl::nanobench::templates::htmlBoxplot(), html);
336 2020-07-31T18:32:45  <jeremyrubin> its probably best to play a bit with epochIterations() and epochs() argument to get reasonable visualization and result
337 2020-07-31T18:33:21  <jeremyrubin> if you look at my comment https://github.com/bitcoin/bitcoin/pull/18710#issuecomment-640095382
338 2020-07-31T18:33:51  <jeremyrubin> ^^^ back to non martinus
339 2020-07-31T18:33:56  <jeremyrubin> https://codesequoia.wordpress.com/2013/03/27/condition-variables-performance-of-boost-win32-and-the-c11-standard-library/
340 2020-07-31T18:34:20  <jeremyrubin> this shows that std's condvar is defective
341 2020-07-31T18:34:48  <jeremyrubin> so what im asking to test is that whichever primitive were using is not defective
342 2020-07-31T18:36:11  <jeremyrubin> idk if it's an issue in that particular environment
343 2020-07-31T18:36:22  <jeremyrubin> or an issue with c++11 generally
344 2020-07-31T18:36:53  <jeremyrubin> but the checkqueue would be prett sensitive to something like this, and is perf critical
345 2020-07-31T18:37:17  <hebasto> this article did not mention c++ library version
346 2020-07-31T18:37:58  <sipa> "Visual Studio 2012 Express"
347 2020-07-31T18:38:05  <jeremyrubin> so i'd prefer not leaving unless we have confidence the defect doesnt exist in our supported platforms
348 2020-07-31T18:38:09  <sipa> i suspect is the c++ library version :)
349 2020-07-31T18:38:16  <jeremyrubin> sipa: correct
350 2020-07-31T18:38:51  <jeremyrubin> and the issue isnt avg perf, it's the variance
351 2020-07-31T18:39:04  <jeremyrubin> which is why current bench doesnt inform much
352 2020-07-31T18:40:06  <hebasto> so the goal is to compare boost:: and std:: condvar performance variances?
353 2020-07-31T18:40:16  <jeremyrubin> fwiw there could be a legit reason to prefer the slower one -- maybe it delegates to the OS more and it's a thread priority issue
354 2020-07-31T18:40:47  <jeremyrubin> but idk, and i'd be nervous to make a change without being sure
355 2020-07-31T18:41:11  <jeremyrubin> hebasto: yes, in addition to actual performance
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357 2020-07-31T18:41:21  <hebasto> yes, we must be sure before making changes
358 2020-07-31T18:42:34  <dburkett> https://github.com/bitcoin/bitcoin/blob/master/src/net_processing.cpp#L729-L730
359 2020-07-31T18:43:08  <dburkett> If a block is part of the active chain, or we have the data in blk*.dat, in what cases would we not have tx data downloaded?
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361 2020-07-31T18:43:50  <jeremyrubin> hebasto: this one is just particularly annoying :/ i suspect that this issue has been fixed or doesnt exist on non windows but who knows.
362 2020-07-31T18:44:13  <jeremyrubin> if it were only a regression on windows i'd still favor the patch
363 2020-07-31T18:44:33  <sipa> dburkett: when it's pruned, i think
364 2020-07-31T18:44:46  <jeremyrubin> but with condvars its both a hardware and system issue
365 2020-07-31T18:44:52  <sipa> dburkett: ah, no
366 2020-07-31T18:45:21  <jeremyrubin> so you should engage e.g. wumpus on what's a reasonable set to test
367 2020-07-31T18:45:56  <sipa> dburkett: HaveTxDownloaded() means that a block and _all its parents_ have been downloaded
368 2020-07-31T18:47:20  <dburkett> Ah, that makes sense! I knew it wasn't the case of pruned, because the docs specifically state that returning true doesn't mean txs haven't been pruned.
369 2020-07-31T18:47:32  <dburkett> I forgot nChainTx is the number of txs in the entire chain up to that point.  Makes sense now. Thanks sipa
370 2020-07-31T18:49:02  <sipa> HAVE_BLOCK_DATA is unset when a block is pruned
371 2020-07-31T18:49:07  <sipa> but nTx/nChainTx remain
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373 2020-07-31T18:54:10  <dburkett> Got it. There's a lot of possible states these indices can be in. It's sometimes hard for me to keep track of all of them :)
374 2020-07-31T19:00:18  <achow101> wallet meeting?
375 2020-07-31T19:01:10  <provoostenator> I'm around
376 2020-07-31T19:01:14  <achow101> #startmeeting
377 2020-07-31T19:01:14  <lightningbot> Meeting started Fri Jul 31 19:01:14 2020 UTC.  The chair is achow101. Information about MeetBot at http://wiki.debian.org/MeetBot.
378 2020-07-31T19:01:14  <lightningbot> Useful Commands: #action #agreed #help #info #idea #link #topic.
379 2020-07-31T19:01:18  <provoostenator> hi
380 2020-07-31T19:01:57  <achow101> #bitcoin-core-dev Wallet Meeting: wumpus sipa gmaxwell jonasschnelli morcos luke-jr sdaftuar jtimon cfields petertodd kanzure bluematt instagibbs phantomcircuit codeshark michagogo marcofalke paveljanik NicolasDorier jl2012 achow101 meshcollider jnewbery maaku fanquake promag provoostenator aj Chris_Stewart_5 dongcarl gwillen jamesob ken281221 ryanofsky gleb moneyball ariard digi_james amiti fjahr
381 2020-07-31T19:02:08  <provoostenator> Review nag for #15382 which is hopefully pretty close
382 2020-07-31T19:02:10  <gribble> https://github.com/bitcoin/bitcoin/issues/15382 | util: add RunCommandParseJSON by Sjors · Pull Request #15382 · bitcoin/bitcoin · GitHub
383 2020-07-31T19:02:24  <achow101> that's on my review queue
384 2020-07-31T19:02:54  <achow101> the main sqlite wallet pr is now ready for review
385 2020-07-31T19:03:13  <provoostenator> Nice, will move on to that after I'm done with a Taproot excursion
386 2020-07-31T19:03:26  <achow101> I was also wondering whether we wanted to do #19619 before it though
387 2020-07-31T19:03:28  <gribble> https://github.com/bitcoin/bitcoin/issues/19619 | Remove wallet.dat path handling from wallet.cpp, rpcwallet.cpp by ryanofsky · Pull Request #19619 · bitcoin/bitcoin · GitHub
388 2020-07-31T19:05:13  <achow101> no topics today?
389 2020-07-31T19:05:36  <provoostenator> Not much news from my end
390 2020-07-31T19:06:12  <provoostenator> 0.20.1 has the PSBT change, that's all we needed there?
391 2020-07-31T19:06:22  <achow101> yes
392 2020-07-31T19:06:36  <provoostenator> sipa: when miniscript?
393 2020-07-31T19:06:50  <achow101> also #19602 is legacy to descriptor wallet migration
394 2020-07-31T19:06:52  <gribble> https://github.com/bitcoin/bitcoin/issues/19602 | wallet: Migrate legacy wallets to descriptor wallets by achow101 · Pull Request #19602 · bitcoin/bitcoin · GitHub
395 2020-07-31T19:07:19  <provoostenator> Shouldn't that go in the wallet tool?
396 2020-07-31T19:07:26  <provoostenator> At least until we really insist on an upgrade?
397 2020-07-31T19:07:47  <achow101> it could
398 2020-07-31T19:08:23  <achow101> i made it a separate RPC, but it could also be rolled into upgradewallet
399 2020-07-31T19:08:28  <provoostenator> And even if we insist on an upgrade, only the GUI would need access to this code, client users can use wallettool
400 2020-07-31T19:09:27  <achow101> sure
401 2020-07-31T19:10:25  <achow101> however it is useful to not have to unload and reload a wallet in order to migrate it
402 2020-07-31T19:12:31  <achow101> #endmeeting
403 2020-07-31T19:12:31  <lightningbot> Meeting ended Fri Jul 31 19:12:31 2020 UTC.  Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4)
404 2020-07-31T19:12:31  <lightningbot> Minutes:        http://www.erisian.com.au/meetbot/bitcoin-core-dev/2020/bitcoin-core-dev.2020-07-31-19.01.html
405 2020-07-31T19:12:31  <lightningbot> Minutes (text): http://www.erisian.com.au/meetbot/bitcoin-core-dev/2020/bitcoin-core-dev.2020-07-31-19.01.txt
406 2020-07-31T19:12:31  <lightningbot> Log:            http://www.erisian.com.au/meetbot/bitcoin-core-dev/2020/bitcoin-core-dev.2020-07-31-19.01.log.html
407 2020-07-31T19:15:27  *** bitcoin-git has joined #bitcoin-core-dev
408 2020-07-31T19:15:28  <bitcoin-git> [bitcoin] Saibato opened pull request #19635: param: add bool parameter -ephemeraltoronion to generate ephemeral tor addreses (master...ephemeral-tor-onion) https://github.com/bitcoin/bitcoin/pull/19635
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410 2020-07-31T19:23:26  <jonasschnelli> 0.20.1 detached signatures are up and tagged
411 2020-07-31T19:23:51  <achow101> gitian builders ^
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422 2020-07-31T20:48:02  <meshcollider> Oh no totally forgot the meeting this morning! Thanks achow101
423 2020-07-31T20:48:19  <meshcollider> Looks like a short one anyway
424 2020-07-31T20:49:07  <meshcollider> 12:57 AM <aj> jnewbery: "people will .. miss meetings and get annoyed" oh, look, there's the box i'm in
425 2020-07-31T20:49:32  <meshcollider> :)
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428 2020-07-31T21:09:33  <jeremyrubin> sipa: is this proven: not exists tx tx2. txid(tx) == wtxid(tx2) && tx != tx2
429 2020-07-31T21:10:54  <sipa> jeremyrubin: yes, assuming double-sha256 collision resistance that statement is equivalent to ser_without_witness(tx) == ser_with_witness(tx2)
430 2020-07-31T21:11:27  <sipa> either both tx and tx2 don't have a witness, and the statement is obviously false
431 2020-07-31T21:11:45  <sipa> or tx2 has a witness, in which case the serialization definitely differs, due to the flag byte
432 2020-07-31T21:13:08  <jeremyrubin> but it's not possible in tx2 that the flag + marker can be read as the length field for the txins?
433 2020-07-31T21:13:32  <jeremyrubin> because a leading 0 byte means it can't be a length right?
434 2020-07-31T21:13:59  <jeremyrubin> in which case it would be marker and not flag that guarantees uniqueness?
435 2020-07-31T21:15:06  <sipa> a valid transactions cannot have 0 inputs
436 2020-07-31T21:15:34  <sipa> the witness serialization is intended to be unambiguously different from the old serialization
437 2020-07-31T21:15:58  <sipa> (except that we later discovered that people do pass around transactions with 0 inputs, where things break... but that's not relevant for valid network transactions)(
438 2020-07-31T21:17:52  <jeremyrubin> gotcha. and the unambiguity is because it's a compactsize field preceding the vIn
439 2020-07-31T21:18:10  <jeremyrubin> so 0 is always read as a 1 byte number in any context
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441 2020-07-31T21:19:14  <sipa> indeed
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443 2020-07-31T21:27:22  <harding> wumpus: FYI, 0.20.1 website PR: https://github.com/bitcoin-core/bitcoincore.org/pull/711
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451 2020-07-31T22:05:56  *** bitcoin-git has joined #bitcoin-core-dev
452 2020-07-31T22:05:56  <bitcoin-git> [bitcoin] achow101 opened pull request #19636: doc: Update 0.20.1 release notes with psbt changes (0.20...0.20.1-psbt-relnotes) https://github.com/bitcoin/bitcoin/pull/19636
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456 2020-07-31T22:44:49  <luke-jr> oops? too late?
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