[Bitcoin-development] blind symmetric commitment for stronger byzantine voting resilience (Re: bitcoin taint & unilateral revocability)

[Mike Hearn]

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 at gmail.com> wrote:

> On Wed, May 15, 2013 at 6:24 PM, Gavin <gavinandresen at 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 at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/bitcoin-development
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.linuxfoundation.org/pipermail/bitcoin-dev/attachments/20130515/45e8634b/attachment.html>