public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Matt Corallo <lf-lists@mattcorallo.com>
To: Ittay <ittay.eyal@cornell.edu>,
	Ittay via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org>,
	Bryan Bishop <kanzure@gmail.com>
Cc: Bitcoin Dev <bitcoin-dev@lists.linuxfoundation.org>,
	Ittay Eyal <ittay.eyal@cornell.edu>
Subject: Re: [bitcoin-dev] Bitcoin-NG whitepaper.
Date: Wed, 14 Oct 2015 18:57:08 +0000	[thread overview]
Message-ID: <28CC699B-4DA8-4472-A795-9505418C688A@mattcorallo.com> (raw)
In-Reply-To: <CABT1wW=xqShMGU0+eDiNyNkr-77fQ_HnyKL87C6iGL-xq8BYVw@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 2200 bytes --]

That conversation missed a second issue. Namely that there is no way to punish people if there is a double spend in a micro block that happens in key block which reorg'd away the first transaction. eg one miner mines a transaction in a micro block, another miner (either by not having seen the first yet, or being malicious - potentially the same miner) mines a key block which reorgs away the first micro block and then, in their first micro block, mines a double spend. This can happen at any time, so you end up having to fall back to regular full blocks for confirmation times :(.

Also, Greg Slepak brought up a good point on twitter at https://twitter.com/taoeffect/status/654358023138209792. Noting that this model means users could no longer pick transactions in a mining pool which was set up in such a way (it could be tweaked to do so with separate rewards and pubkeys, but now the user can commit fraud at a much lower cost - their own pool reward, not the block's total reward).

On October 14, 2015 11:28:51 AM PDT, Ittay via bitcoin-dev <bitcoin-dev@lists.linuxfoundation.org> wrote:
>On Wed, Oct 14, 2015 at 2:12 PM, Bryan Bishop <kanzure@gmail.com>
>wrote:
>
>> On Wed, Oct 14, 2015 at 1:02 PM, Emin Gün Sirer
>> <bitcoin-dev@lists.linuxfoundation.org> wrote:
>> > while the whitepaper has all the nitty gritty details:
>> >      http://arxiv.org/abs/1510.02037
>>
>> Taking reward compensation back by fraud proofs is not enough to fix
>> the problems associated with double spending (such as, everyone has
>to
>> wait for the "real" confirmations instead of the "possibly
>> double-spend" confirmations). Some of this was discussed in -wizards
>> recently:
>> http://gnusha.org/bitcoin-wizards/2015-09-19.log
>
>
>Fraud proof removes all the attacker's revenue. It's like the attacker
>sacrifices an entire block for double spending in the current system. I
>think Luke-Jr got it right at that discussion.
>
>Best,
>Ittay
>
>
>------------------------------------------------------------------------
>
>_______________________________________________
>bitcoin-dev mailing list
>bitcoin-dev@lists.linuxfoundation.org
>https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev

[-- Attachment #2: Type: text/html, Size: 3323 bytes --]

  reply	other threads:[~2015-10-14 18:57 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-14 18:02 [bitcoin-dev] Bitcoin-NG whitepaper Emin Gün Sirer
2015-10-14 18:12 ` Bryan Bishop
2015-10-14 18:28   ` Ittay
2015-10-14 18:57     ` Matt Corallo [this message]
2015-10-15 15:09       ` Ittay
2015-10-28  2:08         ` Matt Corallo
2015-11-06 20:48           ` Ittay
2015-10-14 18:14 ` Sergio Demian Lerner
     [not found] ` <20151014182055.GC23875@mcelrath.org>
2015-10-14 18:38   ` Ittay
2015-10-14 18:39   ` Emin Gün Sirer
2015-10-14 22:21     ` odinn
2015-10-15  1:59       ` Matt Corallo
2015-10-15  8:48         ` odinn
2015-10-15 15:12           ` Ittay
2015-10-15 18:43             ` odinn
2015-10-14 20:52 ` Bob McElrath
2015-11-09 18:33 ` Emin Gün Sirer

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=28CC699B-4DA8-4472-A795-9505418C688A@mattcorallo.com \
    --to=lf-lists@mattcorallo.com \
    --cc=bitcoin-dev@lists.linuxfoundation.org \
    --cc=ittay.eyal@cornell.edu \
    --cc=kanzure@gmail.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox