W3C home > Mailing lists > Public > public-webpayments@w3.org > September 2013

Re: MintChip and duplicate detection

From: Joseph Potvin <jpotvin@opman.ca>
Date: Fri, 20 Sep 2013 10:12:17 -0400
Message-ID: <CAKcXiSqLkkchNTyAW5FKvfhjvp2Yaf7hEAmyLN3ffsNNPMqodQ@mail.gmail.com>
To: Dave Raggett <dsr@w3.org>, Web Payments CG <public-webpayments@w3.org>
To get an answer to your question it appears you'll hit an
Intellectual Provenance (IP) restriction, because your learning would
be under the terms of the license (see below).   Should you inspect
any of the assets provided via
http://developer.mintchipchallenge.com/downloads.php   then if you
actually learn any of the computational ideas implemented in MintChip,
for the rest of your career you'd better be careful about the several
patents held by the core system developers. More likely, it seems you
need not expect to get source code access to any of the interesting

MintChip Developer License Agreement

By downloading content from the Royal Canadian Mint (the "RCM")
Website, installing, copying or otherwise using the contents of the
Kit (as defined below) or any component thereof, you are accepting a
license from the RCM (the "License Agreement") and you are agreeing to
be bound by this License Agreement. If you do not agree to the terms
of this License Agreement, you are not authorised to install or use
the Kit or any component thereof.


"Kit" means:

the MintChip hardware development kit, along with each and every one
of its components;
two (2) MintChip MicroSD cards;
one (1) MintChip USB Reader;
one (1) MintChip MicroSD - SD Reader;
the Materials;
the Programs; and
the Software.

"Materials" means MintChip documentation, modifications, subsequent
versions, support materials and manuals.

"MintChip" means digital currency originating from an integrated circuit.

"Programs" means the MintChip toolkit and sample applications.

"Software" means Programs, third party software, bug fixes, diagnostic
software, and any subsequent versions thereof.


Note: Your duties under this section shall survive expiration or
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2.1 License - The RCM hereby grants you a limited, non-exclusive,
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to create software applications for evaluating MintChip, and for no
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third party software are used in accordance with this License

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On Fri, Sep 20, 2013 at 9:22 AM, Dave Raggett <dsr@w3.org> wrote:
> I read on [1] that MintChip uses a random number generated by the receiver
> to detect duplicates and prevent double spending.
> Can anyone explain the details of this?  Is there a history of these numbers
> to prevent replay attacks?  I presume that the history can be bounded by
> only allowing transactions within a limited time after the initial payment
> request. Is a MintChip restricted to a single transaction at any given time?
> What happens when a valid transaction message isn't received in time? The
> sender would have debited its balance, but the received wouldn't have
> credited its balance.
> Is there any discussion on revoking the private key used to sign
> transactions? Whilst it is probably impractical to extract the key from the
> secure chip, it might be stolen from the Royal Canadian Mint.
> [1] http://developer.mintchipchallenge.com/devguide/transactions.html
> --
> Dave Raggett <dsr@w3.org> http://www.w3.org/People/Raggett

Joseph Potvin
Operations Manager | Gestionnaire des opérations
The Opman Company | La compagnie Opman
Mobile: 819-593-5983
LinkedIn (Google short URL): http://goo.gl/Ssp56
Received on Friday, 20 September 2013 14:13:04 UTC

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