Fwd: [gsc] Fwd: Bitcoin P2P e-cash paper

R.A. Hettinga rah at shipwright.com
Sun Nov 2 13:49:42 PST 2008


Begin forwarded message:

> From: Eric S Johansson <esj at esjworks.com>
> Date: November 2, 2008 3:13:57 PM EST
> To: "R.A. Hettinga" <rah at shipwright.com>
> Subject: Re: [gsc] Fwd: Bitcoin P2P e-cash paper
>
> R.A. Hettinga wrote:
>> In re: <http://www.bitcoin.org/bitcoin.pdf>
>>
>> On Nov 2, 2008, at 12:27 PM, R.A. Hettinga wrote:
>>
>>> On Nov 2, 2008, at 9:52 AM, Patrick Chkoreff wrote:
>>>
>>>> That is a great paper.
>>>
>>> Shit. Now I have to read the damn thing.
>>
>> -------
>>
>> :-)
>>
>> Kewl. Nice to see that someone's blown the cobwebs off the stuff  
>> that's
>> out there, and done something interesting.
>>
>>
>> So, one of the things I like is that it's got a distributed mint,  
>> kinda
>> like Juels and Jakobsson's Breadpudding scheme for Shamir/Rivest's
>> Micromint.
>>
>> Not to mention a variant of Adam Back's Hashcash proof of work stuff.
>> I've never been convinced by the Bayes-filter guys' incessant  
>> attacks on
>> proof of work schemes like Eric Johansson's Camram, myself, though  
>> I've
>> always been more interested in underwriting other things of value
>> besides mere machine horsepower. :-). Looks like this is long-awaited
>> step in the right direction.
>>
> just a quick update on the project formerly known as camram and now  
> known as 2
> penny blue (came later then and had a higher value than Penny  
> Black.  :-).  It's
> still alive albeit suffering from a bit of neglect.  I'm currently  
> restructuring
> it to make it more robust in the face of ill formed messages and add  
> reputation
> handling.  this latter feature is a major shift in my perception of  
> proof of
> work puzzles with regards to anti-spam.  It came because the  
> realization that
> solving approval work puzzles is an expression of reputation.  as a  
> result, this
> means with reputation data from traffic analysis (i.e. which  
> addresses are the
> source of lots of good messages), one can use a smaller proof of  
> work puzzle to
> guarantee delivery for good sites and only guarantee it won't be  
> thrown away
> sight unseen for neutral or bad sites.
>
> Might not seem like much but early experiments show promise.
>
> Bob, feel free to forward this to anyone you think should see it.  
> (not that I
> could stop you :-)
>
> hope all is well.
>
> ---eric





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