public inbox for bitcoindev@googlegroups.com
 help / color / mirror / Atom feed
From: Mike Hearn <mike@plan99.net>
To: Gregory Maxwell <gmaxwell@gmail.com>
Cc: "bitcoin-development@lists.sourceforge.net"
	<bitcoin-development@lists.sourceforge.net>
Subject: Re: [Bitcoin-development] blind symmetric commitment for stronger byzantine voting resilience (Re: bitcoin taint & unilateral revocability)
Date: Wed, 15 May 2013 19:22:51 -0700	[thread overview]
Message-ID: <CANEZrP2dFi-3nZhYpaA9RfJ8N2e-GQ_YQtKMdnFfPx-9YLU6MA@mail.gmail.com> (raw)
In-Reply-To: <CAAS2fgQP6mFb0izQxZcBwqBWdxKUiAy1sG23ScAZ+tEMvGU0WQ@mail.gmail.com>

[-- Attachment #1: Type: text/plain, Size: 2556 bytes --]

Conceptually it sounds a lot like ZeroCoin (not in implementation)?

I'm not really convinced miner cartels that try to exclude transactions are
likely to be a big deal, but such schemes could I suppose be kept in a back
pocket in case one day I'm proven wrong.


On Wed, May 15, 2013 at 6:39 PM, Gregory Maxwell <gmaxwell@gmail.com> wrote:

> On Wed, May 15, 2013 at 6:24 PM, Gavin <gavinandresen@gmail.com> wrote:
> > Busy with pre-conference stuff, not following details of this
> conversation...
> >
> > ... but it sounds a lot like the "guy fawkes" protocol Zooko was
> thinking about a year or so ago.
>
> Sort of, but in a guy fawkes signature you use the commitment to hide
> the preimage that proves you had authority to spend a coin.   Adam
> proposes you do this in order to hide _which coin you're spending_.
>
> This has obvious anti-DOS complications, but Adam deftly dodged my
> initial attempts to shoot him down on these grounds by pointing out
> that you could mix blinded and blinded inputs and have priority and
> transaction fees come from only the unblinded ones.
>
> Effectively,  it means that so long as you could convince the network
> to let you spend some coins, you could also spend other ones along for
> the ride and the network wouldn't know which ones those were until it
> was too late for it to pretend it never saw them.
>
> I think there are all kinds of weird economic implications to this— a
> blinded payment would seem to have a different utility level to an
> unblinded one: you can't use it for fees— except you can unblind it at
> any time.  And the discontinuousness  ("two types of inputs") and that
> it would enable mining gibberish (though perhaps not data storage, if
> you see my preimage solution to that) seems awkward and I think I have
> to spend some time internalizing it before I can really think through
> the implications.
>
>
> ------------------------------------------------------------------------------
> AlienVault Unified Security Management (USM) platform delivers complete
> security visibility with the essential security capabilities. Easily and
> efficiently configure, manage, and operate all of your security controls
> from a single console and one unified framework. Download a free trial.
> http://p.sf.net/sfu/alienvault_d2d
> _______________________________________________
> Bitcoin-development mailing list
> Bitcoin-development@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>

[-- Attachment #2: Type: text/html, Size: 3339 bytes --]

  reply	other threads:[~2013-05-16  2:22 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-05-14 11:51 [Bitcoin-development] ecash and revocability Adam Back
2013-05-14 14:09 ` [Bitcoin-development] bitcoin taint & unilateral revocability (Re: ecash and revocability) Adam Back
2013-05-14 14:27   ` Simon Barber
2013-05-14 17:30   ` grarpamp
2013-05-15 10:25   ` [Bitcoin-development] blind symmetric commitment for stronger byzantine voting resilience (Re: bitcoin taint & unilateral revocability) Adam Back
2013-05-15 11:19     ` Peter Todd
2013-05-15 11:49       ` Adam Back
2013-05-15 12:40         ` Caleb James DeLisle
2013-05-15 16:21           ` Adam Back
2013-05-15 18:01             ` Caleb James DeLisle
2013-05-15 23:40             ` Adam Back
2013-05-16  1:24               ` Gavin
2013-05-16  1:39                 ` Gregory Maxwell
2013-05-16  2:22                   ` Mike Hearn [this message]
2013-05-16  2:45                     ` Gregory Maxwell
2013-05-16  5:52                       ` Caleb James DeLisle
2013-05-16 11:32                       ` Adam Back
2013-05-16 14:51                         ` Adam Back

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=CANEZrP2dFi-3nZhYpaA9RfJ8N2e-GQ_YQtKMdnFfPx-9YLU6MA@mail.gmail.com \
    --to=mike@plan99.net \
    --cc=bitcoin-development@lists.sourceforge.net \
    --cc=gmaxwell@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