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From: Tier Nolan <tier.nolan@gmail.com>
To: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] We need to fix the block withholding attack
Date: Sat, 26 Dec 2015 16:09:18 +0000	[thread overview]
Message-ID: <CAE-z3OUrCFkVQ+1th-BjkZf1YEhPjub7TA_2J-CRNmCs6Bb7Dg@mail.gmail.com> (raw)
In-Reply-To: <ema8a70574-c28e-4c43-a1e3-5f2f4df7d3a2@platinum>

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On Sat, Dec 26, 2015 at 8:23 AM, Eric Lombrozo via bitcoin-dev <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> Unfortunately, this also means longer confirmation times, lower
> throughput, and lower miner revenue. Note, however, that confirmations
> would (on average) represent more PoW, so fewer confirmations would be
> required to achieve the same level of security.
>


No, the re-target compensates so that the number of blocks in the last two
weeks is 2016.  If a soft fork forces miners to throw away 25% of their
blocks, then the difficulty will drop by 75% to keep things balanced.
Throwing away 75% of blocks has the same effect on difficulty as destroying
75% of mining hardware.

The block interval will only increase until the next re-target.

Slowly increasing the fraction of blocks which are thrown away gives the
re-target algorithm time to adjust, so it is another advantage.

If the rule was instantly changed so that 95% of blocks were thrown away,
then there could be up to 40 weeks until the next retarget and that would
give 200 minute block times until the adjustment.

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  parent reply	other threads:[~2015-12-26 16:09 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-19 18:42 [bitcoin-dev] We need to fix the block withholding attack Peter Todd
2015-12-19 19:30 ` Bob McElrath
2015-12-19 20:03 ` jl2012
2015-12-20  3:34 ` Chris Priest
2015-12-20  3:36   ` Matt Corallo
2015-12-20  3:43     ` Chris Priest
2015-12-20  4:44       ` Peter Todd
2015-12-26  8:12         ` Multipool Admin
2015-12-27  4:10           ` Geir Harald Hansen
2015-12-28 19:12           ` Peter Todd
2015-12-28 19:30             ` Emin Gün Sirer
2015-12-28 19:35               ` Multipool Admin
2015-12-28 19:33             ` Multipool Admin
2015-12-28 20:26             ` Ivan Brightly
2015-12-29 18:59               ` Dave Scotese
2015-12-29 19:08                 ` Jonathan Toomim
2015-12-29 19:25                 ` Allen Piscitello
2015-12-29 21:51                   ` Dave Scotese
2015-12-20  3:40   ` jl2012
2015-12-20  3:47     ` Chris Priest
2015-12-20  4:24       ` jl2012
2015-12-20  5:12         ` Emin Gün Sirer
2015-12-20  7:39           ` Chris Priest
2015-12-20  7:56             ` Emin Gün Sirer
2015-12-20  8:30               ` Natanael
2015-12-20 11:38           ` Tier Nolan
2015-12-20 12:42             ` Natanael
2015-12-20 15:30               ` Tier Nolan
2015-12-20 13:28           ` Peter Todd
2015-12-20 17:00             ` Emin Gün Sirer
2015-12-21 11:39               ` Jannes Faber
2015-12-25 11:15                 ` Ittay
2015-12-25 12:00                   ` Jonathan Toomim
2015-12-25 12:02                   ` benevolent
2015-12-25 16:11                   ` Jannes Faber
2015-12-26  0:38               ` Geir Harald Hansen
2015-12-28 20:02               ` Peter Todd
2015-12-26  8:23             ` Eric Lombrozo
2015-12-26  8:26               ` Eric Lombrozo
2015-12-26 15:33               ` Jorge Timón
2015-12-26 17:38                 ` Eric Lombrozo
2015-12-26 18:01                   ` Jorge Timón
2015-12-26 16:09               ` Tier Nolan [this message]
2015-12-26 18:30                 ` Eric Lombrozo
2015-12-26 19:34                   ` Jorge Timón
2015-12-26 21:22               ` Jonathan Toomim
2015-12-27  4:33                 ` Emin Gün Sirer

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