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492017-10-31T05:14:39 <weuniverse> Join
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762017-10-31T09:38:27 <bitcoin-git> [bitcoin] practicalswift opened pull request #11585: addrman: Add missing lock in Clear() (CAddrMan) (master...missing-lock-in-addrman-clear) https://github.com/bitcoin/bitcoin/pull/11585
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1262017-10-31T11:59:51 <jtimon_> wasn't there a communicate that bitcoin core will never release non free software somewhere?
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1312017-10-31T12:11:22 <bitcoin-git> [bitcoin] laanwj pushed 2 new commits to master: https://github.com/bitcoin/bitcoin/compare/bb9ab0fccfba...8335cb478183
1322017-10-31T12:11:23 <bitcoin-git> bitcoin/master 2530bf2 practicalswift: net: Add missing lock in ProcessHeadersMessage(...)...
1332017-10-31T12:11:23 <bitcoin-git> bitcoin/master 8335cb4 Wladimir J. van der Laan: Merge #11578: net: Add missing lock in ProcessHeadersMessage(...)...
1342017-10-31T12:12:15 <bitcoin-git> [bitcoin] laanwj closed pull request #11578: net: Add missing lock in ProcessHeadersMessage(...) (master...ProcessHeadersMessage) https://github.com/bitcoin/bitcoin/pull/11578
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1382017-10-31T12:33:38 <Cirolaus_> just let you guys now that you can earn bitcoin by gaming (not affiliate link) https://coinleague.cc
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1632017-10-31T14:46:33 <promag> sipa: friendly ping #11563
1642017-10-31T14:46:34 <gribble> https://github.com/bitcoin/bitcoin/issues/11563 | Improve CheckBlockIndex performance by promag · Pull Request #11563 · bitcoin/bitcoin · GitHub
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1672017-10-31T15:37:19 <kanzure> for manually testing hard-fork scenarios (when hard-fork clients don't supply adequate test infrastructure), it should be sufficient to have two regtests that have common history and then are kept separated, right?
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1692017-10-31T15:43:54 <sipa> kanzure: invalidateblock is your friend
1702017-10-31T15:44:09 <kanzure> ah that could work for this.
1712017-10-31T15:44:22 <kanzure> thank you
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1832017-10-31T15:53:33 <kanzure> also: there should be a walletnotify that triggers a notification with pre-configured memo field after configurable n blocks.
1842017-10-31T15:53:56 <kanzure> which should solve basically all of the payments integration use cases
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1862017-10-31T15:56:12 <promag> you mean alertnotify?
1872017-10-31T15:56:43 <sipa> that's for alerts
1882017-10-31T15:56:51 <sipa> not for payments
1892017-10-31T15:57:05 <promag> walletnotify only notifies txid right?
1902017-10-31T15:57:30 <sipa> yes
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1922017-10-31T15:59:13 <promag> then I don't understand what kanzure is saying
1932017-10-31T15:59:36 <sipa> he wants a notification only when it gets a spefific number of confirmations
1942017-10-31T15:59:54 <sipa> that's configurable per address/label
1952017-10-31T16:00:29 <promag> why?
1962017-10-31T16:00:58 <kanzure> haha what do you mean why?
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1982017-10-31T16:01:06 <promag> having that may cause lots of notifications
1992017-10-31T16:01:17 <kanzure> yes i agree it will cause lots of notifications (due to lots of internal reasons)
2002017-10-31T16:01:24 <kanzure> but having many notifications is better than no notifications
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2022017-10-31T16:01:34 <promag> but there is a notification: blocknotify
2032017-10-31T16:01:37 <kanzure> walletnotify on first confirmation isn't useful-- you need the notification to be triggered after n notifications
2042017-10-31T16:01:41 <kanzure> blocknotify is not the same thing
2052017-10-31T16:02:00 <kanzure> think about your typical idiot web developer-- the simplest possible solution is a notification when the payment is well-confirmed
2062017-10-31T16:02:01 <promag> because of forks?
2072017-10-31T16:02:07 <sipa> the idea is that you can check number of confirmations of all your oending transactions after each block
2082017-10-31T16:02:16 <sipa> as those are the only times ehen confirmationd can change
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2102017-10-31T16:02:50 <kanzure> yes but that's more work for the web developer-- if you give them a notification, it's almost zero additional work, and it's easier than setting up stripe
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2122017-10-31T16:04:24 <sipa> kanzure: there are other complications... you need to keep track of your oayments and their confirmation status, what theybwere for, make sure that is in safe storage (so that after a system failure, you don't end up with payments without knowing what order they are for, ...)
2132017-10-31T16:05:00 <sipa> but yes, having a notification for a specific number of confirmations would be useful - except this now also needs backups inside core
2142017-10-31T16:05:02 <promag> been there, and walletnotify is not a good solution, you can easily lost notifications, you can have lots of pending transactions, etc.. the overhead can be huge IMO
2152017-10-31T16:05:22 <kanzure> lost notifications are a problem, and yes wallet backup procedures become more important, but they were important anyway
2162017-10-31T16:06:06 <promag> I always thought of a thing like postgres wal, that can be replayed
2172017-10-31T16:06:15 <sipa> i think the only correct solution is that you keep track of confirmations yourself, and after every walletnofiy/blocknotofy you check your outstanding payments again
2182017-10-31T16:06:32 <sipa> even ignore the txid passed in walletnotify
2192017-10-31T16:06:39 <kanzure> sipa: the exercise was how to minimize the total integration complexity for a web merchant
2202017-10-31T16:06:45 <sipa> listsinceblock can help reduce bandwidth
2212017-10-31T16:06:57 <promag> IIRC walletnotify notifies 1 -> 0 confirmation change right?
2222017-10-31T16:07:05 <kanzure> only on 0 and 1 conf
2232017-10-31T16:07:06 <sipa> kanzure: yes, and i don't have a good way of doing that that doesn't result in more risks
2242017-10-31T16:07:36 <kanzure> sipa: more risk is probably okay, since the total cost of the integration is so low, more resources can be spent by the integrator on e.g. backup procedures.
2252017-10-31T16:07:54 <sipa> backup procedures may not be enough
2262017-10-31T16:08:20 <sipa> if your solution relies on bitcoind persisting the requested notifications
2272017-10-31T16:08:41 <sipa> as that effectively requires a backup system integrated into bitcoond
2282017-10-31T16:08:47 <promag> what I think is the best for the moment is to keep track of new blocks, and check pending transactions confirmations (without doing too much RPC)
2292017-10-31T16:09:20 <kanzure> promag: my exercise was "what is the 5 minute integration" and walletnotify after 6 blocks would do the trick, even with extremely high risk
2302017-10-31T16:09:46 <sipa> and if you don't rely on that, your web developer needs to deal with restarts and lost notifications anyway, at which poijt as simple "check all unconfirmed txn after every block" will be easier and safer
2312017-10-31T16:09:48 <kanzure> check pending transactions on each blocknotify would involve persisting and doing read-write on that data outside of bitcoind, this is going to take more than 30 seconds for an idiot to implement
2322017-10-31T16:10:10 <sipa> kanzure: *every* solution will require persisiting information outside bitcoind
2332017-10-31T16:10:30 <sipa> how else will you know what your orders are that are being paid, at the least
2342017-10-31T16:10:35 <kanzure> i think it can be minimized and greatly reduced
2352017-10-31T16:10:44 <kanzure> to only one write requirement somewhere. and minimal reads.
2362017-10-31T16:11:07 <kanzure> anyway, i don't have a specific proposal
2372017-10-31T16:11:46 <sipa> we've discussed this many times, but persistance of such notification requests is a pain
2382017-10-31T16:11:55 <sipa> and effectively not something we can do safely now
2392017-10-31T16:11:57 <promag> IMO there is no 5 min integration
2402017-10-31T16:12:35 <sipa> this is part of the reason why accounts aren't safe to use, as well
2412017-10-31T16:13:04 <sipa> you can't guarantee that a backup will happen between the creation of an account address and the receipt of the payment
2422017-10-31T16:13:17 <kanzure> why not? tell the user to do the backup.
2432017-10-31T16:13:32 <sipa> when?
2442017-10-31T16:13:36 <kanzure> whenever you please
2452017-10-31T16:13:44 <sipa> no, not whenever you olease
2462017-10-31T16:13:46 <kanzure> there should be a backupwallet hook
2472017-10-31T16:14:29 <sipa> if you crash after handing out the address, and before making a backup, you lost a customer
2482017-10-31T16:15:07 <kanzure> then you should only return from getnewaddress after the backup is complete..
2492017-10-31T16:15:37 <sipa> yes, which would require a built-in backup solution in bitcoind, which we don't have
2502017-10-31T16:16:17 <sipa> and generally, since you need to store payment information outside anyway, why bother duplicating the complication
2512017-10-31T16:18:03 <sipa> i think a paymemt watching layer in python with sql integration or so would be very useful
2522017-10-31T16:19:11 <sipa> which deals with persisted orders, recovery after restart/crash, RPCs with bitcoind, ....
2532017-10-31T16:20:28 <promag> you can use multiple nodes to scale or even have redundancy with watchonly
2542017-10-31T16:24:16 <promag> sipa, is it worth improving CheckBlockIndex
2552017-10-31T16:24:18 <promag> ?
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2592017-10-31T16:50:16 <kanzure> sipa: that layer would be immensely useful, and would also abolish many merchant's requirement for a payment integrator api service thing. e.g. provides them a reason to run a full node.
2602017-10-31T16:51:30 <sipa> promag: no opinion
2612017-10-31T16:51:41 <sipa> benchmarks help
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2892017-10-31T18:43:11 <cfields> uhmm
2902017-10-31T18:43:28 <cfields> BlueMatt: ping
2912017-10-31T18:43:34 <sipa> *drumroll*
2922017-10-31T18:43:52 <cfields> BlueMatt: i think 57edc0b0 is pretty busted?
2932017-10-31T18:44:15 <BlueMatt> yo?
2942017-10-31T18:44:32 <BlueMatt> why is that busted?
2952017-10-31T18:44:38 <cfields> pretty sure i ACKed that too quickly :\
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2972017-10-31T18:44:55 <BlueMatt> cfields: well I think you mean one of the associated commits, cause that commit itself is literally only a rename
2982017-10-31T18:45:14 <BlueMatt> busted how?
2992017-10-31T18:45:15 <cfields> BlueMatt: grr, nm.
3002017-10-31T18:45:17 <BlueMatt> there is the static seeds issue
3012017-10-31T18:45:32 <cfields> dammit, it always clicks after i do the ping.
3022017-10-31T18:45:34 <BlueMatt> which is fixed in #11512
3032017-10-31T18:45:36 <gribble> https://github.com/bitcoin/bitcoin/issues/11512 | Use GetDesireableServiceFlags in seeds, dnsseeds, fixing static seed adding by TheBlueMatt · Pull Request #11512 · bitcoin/bitcoin · GitHub
3042017-10-31T18:45:53 <cfields> BlueMatt: yea, nm. ignore.
3052017-10-31T18:46:05 <BlueMatt> k
3062017-10-31T18:46:32 <cfields> BlueMatt: i have several patch series that add an m_automatic_connection for addrman connections
3072017-10-31T18:46:49 <cfields> i couldn't unsee, thought the logic was reversed
3082017-10-31T18:47:30 <BlueMatt> heh
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3222017-10-31T19:31:50 <spudowiar> Can nHashType ever be zero?
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3242017-10-31T19:35:57 <jonasschnelli> spudowiar: 0 would be an undefined value
3252017-10-31T19:36:27 <spudowiar> Thanks
3262017-10-31T19:36:58 <jonasschnelli> spudowiar: look at BCH,... they use also it's own SIGHASH-type...
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3282017-10-31T19:37:34 <sipa> i think 0 is totally valid
3292017-10-31T19:37:40 <spudowiar> ok
3302017-10-31T19:37:44 <sipa> but nonstandard
3312017-10-31T19:37:50 <spudowiar> Doing some stupid BTG support for TREZOR
3322017-10-31T19:38:05 <jonasschnelli> Grml.. BTG!
3332017-10-31T19:38:17 <spudowiar> And they decided to use SIGHASH_FORKID with non-BIP143 signatures
3342017-10-31T19:38:22 <spudowiar> So I need to rewrite all that
3352017-10-31T19:39:58 <jonasschnelli> I would prefere if Trezor would not support BTG. :) Sorry for off-topic
3362017-10-31T19:40:15 <jonasschnelli> (but I understand it)
3372017-10-31T19:40:44 <bitcoin-git> [bitcoin] practicalswift opened pull request #11587: Fix warnings when building with -Wthread-safety-analysis (master...âWthread-safety-analysis) https://github.com/bitcoin/bitcoin/pull/11587
3382017-10-31T19:42:15 <spudowiar> jonasschnelli: Believe me, so would I :P
3392017-10-31T19:42:33 <jonasschnelli> heh
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3412017-10-31T19:48:21 <Alkhara> Anyone willing to answer a question 1:1 that has to do with source code but not directly for the Bitcoin project please DM me. I don't want to off-topic but you guys are probably the best source of information on this.
3422017-10-31T19:50:00 <sipa> Alkhara: bitcoin.stackexchange.com
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3802017-10-31T22:51:19 <earlz> Is it possible to modify the gitian scripts to cross-compile bitcoin-qt for ARM?
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3822017-10-31T22:54:38 <achow101> earlz: I believe you can just modify the HOSTS line here: https://github.com/bitcoin/bitcoin/blob/master/contrib/gitian-descriptors/gitian-linux.yml#L37
3832017-10-31T22:54:47 <achow101> you can also just use the depends system and build without gitian
3842017-10-31T22:54:59 <achow101> (which is basically what gitian does but in a VM)
3852017-10-31T22:55:32 <earlz> it already builds bitcoind, etc. But it doesn't build Qt or bitcoin-qt for ARM is the problem
3862017-10-31T22:55:52 <earlz> I can't find where in the code it determines where to build qt or not
3872017-10-31T23:01:53 <earlz> ah, found it.. https://github.com/bitcoin/bitcoin/blob/master/depends/packages/packages.mk#L7
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3892017-10-31T23:02:07 <earlz> unsure if copying that and making it qt_arm_linux_packages will help though
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4022017-10-31T23:24:13 <jonasschnelli> earlz: Yeah... you can try to build it with a dynamic linkes qt?
4032017-10-31T23:24:14 <jonasschnelli> *linked
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