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From: Mark Friedenbach <mark@friedenbach.org>
To: Gary Mulder <flyingkiwiguy@gmail.com>
Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Block size following technological growth
Date: Thu, 30 Jul 2015 10:13:13 -0700	[thread overview]
Message-ID: <CAOG=w-v7sudzc91P32pw7VG=OMNigaj9-dbLLYz_2NYZheW4cQ@mail.gmail.com> (raw)
In-Reply-To: <CAKy9zTA1j6311Y8uo-c_z2JQr8gEwf_gH+HH56rRgZac9fqh9Q@mail.gmail.com>

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The median is used here because that is the consensus rule -- a block
cannot have a timestamp older than the median time of the last 11 blocks.
By linking the changeover to this rule we avoid perverse incentives about
miners lying in their timestamps, or the threshold being crossed, then
reverted, then crossed again, etc.

Maybe a different percentile would have been a better choice, but that ship
sailed in 2009. The rule is what it is right now, and we benefit the most
from using the same rule as consensus for the threshold.
On Jul 30, 2015 9:57 AM, "Gary Mulder via bitcoin-dev" <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> On 30 July 2015 at 16:12, Jorge Timón <
> bitcoin-dev@lists.linuxfoundation.org> wrote:
>
>> 1) Unlike previous blocksize hardfork proposals, this uses median time
>> instead of block.nTime for activation. I like that more but my
>> preference is still using height for everything. But that discussion
>> is not specific to this proposal, so it's better if we discuss that
>> for all of them here:
>>
>> http://lists.linuxfoundation.org/pipermail/bitcoin-dev/2015-July/009731.html
>
>
> Note that a "median" is a special case of a 50% percentile. If you desire
> to apply a more stringent criteria you can use the 75th or even 90th
> percentile.
>
> https://en.wikipedia.org/wiki/Percentile
>
> Perhaps if a statistician (i.e. not me) could be found to offer her
> services, she could become a resource for helping selecting the most
> appropriate statistical algorithms on request (and implemented Integer math
> as per Gavin, from memory), considering the consequences of learning
> post-fork that a "bad statistical model" was chosen.
>
> e.g. an exponentially weighted moving average is usually much less
> volatile and harder to manipulate than a simple moving average, but still
> can "respond" to short term drivers.
>
> Regards,
> Gary
>
> _______________________________________________
> bitcoin-dev mailing list
> bitcoin-dev@lists.linuxfoundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev
>
>

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  reply	other threads:[~2015-07-30 17:13 UTC|newest]

Thread overview: 111+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-07-30 14:25 [bitcoin-dev] Block size following technological growth Pieter Wuille
2015-07-30 15:04 ` Greg Sanders
2015-07-30 15:12 ` Jorge Timón
2015-07-30 16:23   ` Jameson Lopp
2015-07-30 16:36     ` Bryan Bishop
2015-07-30 16:43       ` Jameson Lopp
2015-07-30 16:36   ` Venzen Khaosan
2015-07-30 17:51     ` Jorge Timón
2015-07-30 18:00       ` Jorge Timón
2015-07-30 16:56   ` Gary Mulder
2015-07-30 17:13     ` Mark Friedenbach [this message]
2015-07-30 16:20 ` Gavin Andresen
2015-07-30 16:41   ` Suhas Daftuar
2015-07-30 16:48   ` Adam Back
2015-07-30 16:49   ` Pieter Wuille
2015-07-31 10:16     ` Mike Hearn
2015-07-31 11:43       ` Venzen Khaosan
2015-07-31 11:51       ` Jorge Timón
2015-07-31 12:15         ` Mike Hearn
2015-07-31 13:07           ` Marcel Jamin
2015-07-31 14:33           ` Jorge Timón
2015-07-31 14:58             ` Mike Hearn
2015-07-31 15:28               ` Venzen Khaosan
2015-07-31 20:09               ` Elliot Olds
2015-08-04 10:35               ` Jorge Timón
2015-08-04 11:04                 ` Hector Chu
2015-08-04 11:27                   ` Pieter Wuille
2015-08-04 11:34                     ` Hector Chu
2015-08-04 12:10                       ` Venzen Khaosan
2015-08-04 13:13                       ` Jorge Timón
2015-08-04 13:28                         ` Hector Chu
2015-08-04 13:42                           ` Venzen Khaosan
2015-08-04 17:59                           ` Jorge Timón
2015-08-04 13:12                     ` Gavin Andresen
2015-08-04 13:54                       ` Pieter Wuille
2015-08-04 14:30                       ` Venzen Khaosan
2015-08-04 14:43                         ` [bitcoin-dev] Fwd: " Venzen Khaosan
2015-08-04 14:45                       ` [bitcoin-dev] " Alex Morcos
2015-08-05  8:14                       ` Gareth Williams
2015-08-04 11:59                   ` Jorge Timón
2015-08-04 12:19                     ` Hector Chu
2015-08-04 13:34                       ` Venzen Khaosan
2015-08-04 13:37                       ` Jorge Timón
2015-08-05  7:29                     ` Elliot Olds
2015-08-06  1:26                       ` Jorge Timón
2015-08-06 13:40                         ` Gavin Andresen
2015-08-06 14:06                           ` Pieter Wuille
2015-08-06 14:21                             ` Gavin Andresen
2015-08-06 14:53                               ` Pieter Wuille
     [not found]                                 ` <CABsx9T0B2bZrFHxYR_QNwBmxskQx31zt=QE5BJAYjcOo7wbo3A@mail.gmail.com>
2015-08-06 15:24                                   ` [bitcoin-dev] Fwd: " Gavin Andresen
2015-08-06 15:26                                     ` Pieter Wuille
2015-08-06 18:43                                       ` Michael Naber
2015-08-06 18:52                                         ` Pieter Wuille
2015-08-07 16:06                                           ` Thomas Zander
2015-08-07 16:30                                             ` Pieter Wuille
2015-08-07 17:00                                               ` Thomas Zander
2015-08-07 17:09                                                 ` Pieter Wuille
2015-08-07 21:35                                                   ` Thomas Zander
2015-08-07 22:53                                                     ` Adam Back
2015-08-08 16:54                                                       ` Dave Scotese
2015-08-07 17:50                                               ` Gavin Andresen
2015-08-07 18:05                                                 ` Jameson Lopp
2015-08-07 18:10                                                 ` Pieter Wuille
2015-08-07 21:43                                                   ` Thomas Zander
2015-08-07 22:00                                                   ` Thomas Zander
2015-08-06 16:19                                 ` [bitcoin-dev] " Tom Harding
2015-08-06 21:56                               ` Peter Todd
2015-08-06 15:25                           ` Jorge Timón
2015-08-06 16:03                             ` Gavin Andresen
2015-08-06 16:11                               ` Mike Hearn
2015-08-06 17:15                               ` Jorge Timón
2015-08-06 19:42                                 ` Gavin Andresen
2015-08-06 20:01                                   ` Pieter Wuille
2015-08-06 21:51                                   ` Jorge Timón
2015-08-06 23:09                         ` Elliot Olds
2015-08-10 19:28                           ` Jorge Timón
2015-08-11  5:48                             ` Elliot Olds
2015-08-09 18:46                   ` [bitcoin-dev] What Lightning Is Tom Harding
2015-08-09 18:54                     ` Mark Friedenbach
2015-08-09 20:14                       ` Hector Chu
     [not found]                         ` <CAOG=w-s9KsaPwveSpgdvsVTWUDV77YY7Em7NZGyxSQMMCccYSg@mail.gmail.com>
2015-08-09 20:48                           ` Hector Chu
2015-08-10  4:48                             ` Joseph Poon
2015-08-10 17:03                         ` odinn
2015-08-10 17:14                           ` Pieter Wuille
2015-08-10 17:45                             ` odinn
2015-08-09 21:27                       ` Tom Harding
2015-08-09 21:40                         ` Chris Pacia
2015-08-09 21:45                         ` Hector Chu
2015-08-09 21:57                           ` Patrick Strateman
2015-08-09 22:03                             ` Hector Chu
2015-08-09 22:36                               ` Patrick Strateman
2015-08-10  1:52                           ` Tom Harding
2015-08-10  3:31                             ` Patrick Strateman
2015-08-09 22:06                         ` Patrick Strateman
2015-08-09 22:09                           ` Hector Chu
2015-08-09 22:27                             ` Patrick Strateman
2015-08-09 22:30                               ` Hector Chu
2015-08-09 22:44                             ` Gavin Andresen
2015-08-09 22:51                               ` Btc Drak
2015-08-10  8:27                                 ` Thomas Zander
2015-08-10  8:36                                   ` Patrick Strateman
2015-08-10  4:39                               ` Joseph Poon
2015-08-10 21:02                               ` Anthony Towns
2015-08-10 21:19                                 ` Anthony Towns
2015-08-10 21:43                                   ` Adam Back
2015-08-11  9:01                                     ` Hector Chu
2015-08-11 17:17                                       ` Simon Liu
2015-07-31 14:52           ` [bitcoin-dev] Block size following technological growth Bryan Bishop
2015-07-30 17:46   ` Jorge Timón
2015-08-02 22:35   ` Anthony Towns
2015-07-30 20:20 ` Thomas Zander

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