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Re: [Taler] Hello

From: Joerg Baach
Subject: Re: [Taler] Hello
Date: Thu, 24 Nov 2016 11:30:56 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.4.0

Hi Christian,

sorry for only replying now - your question got somehow lost, and I
discovered it only now, for which I apologize.

The link I sent you to the description of opencoin is the latest
description, an matches the latest implementation of the prototype (the
examples are all 'real'). It is basically what we have.
As you can tell, the project is quite dormant atm, as you rightfully
observed in the taler-draft.pdf.

Speaking of which: in mapping2016 you mention that the paper (I assume
in a less draft version) is available upon request. May I have a copy?

The reason is that I try to understand the taler system. The idea of the
coin being a key pair is quite interesting to me, and I'd like to
understand how exactly it works - but between taler-draft and the other
2016 papers I have seen I am not quite sure if I have understood the
current state of the protocol.

Also, if I may use this opportunity to ask two questions:

1) If the merchant has a rather unusual price for a rare item, the user
pays for it, and refreshes the dirty coin after that - wouldn't the
unusual reminder of the coin provide at least hints to trace the

2) Regarding the contract (fascinating idea as well): I assume the idea
is to use the contract in the case of a dispute with a judge etc. How do
you / the customer / the judge link the key to a real entity, ideally
the right one?

Also, thank you for doing the project, quite happy to see it getting



On 19.03.2016 14:23, Christian Grothoff wrote:
> Hi Joerg,
> Welcome to the Taler list ;-).  We've been aware of OpenCoin for some
> time, but as you might have seen Taler makes some non-trivial changes,
> including in particular the ability to give change and refunds.
> Thanks for the link to the OpenCoin protocol. Still, given that it says
> "This draft is work in heavy progress.", would it be reasonable to say
> that this is now a "complete" description?
> Happy hacking!
> Christian
> On 03/15/2016 06:41 PM, Joerg Baach wrote:
>> Hi *,
>> just found your project, and subscribed to the mailing list. Just wanted
>> to quickly say hello. I am one of the founders of the opencoin project,
>> the "other" chaum implementation. Hence I am quite postively exited to
>> read about your project! :-)
>> As I found a draft for a paper on taler. Have to read in tomorrow, but
>> found the reference to opencoin. In the paper it is mentioned that the
>> protocol description is only partial described. Here is the most current
>> (for given terms of current) version of it. Mayb it is still of interest.
>> https://github.com/jhb/testing/blob/master/opencoin.rst
>> and in a better rendered version:
>> http://baach.de/static/ocdoc/opencoin.html
>> Cheers,
>>   Joerg

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