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Electronic Postmarks

From: Cutler, Roger (RogerCutler) <RogerCutler@chevrontexaco.com>
Date: Fri, 16 Jan 2004 15:03:27 -0600
Message-ID: <7FCB5A9F010AAE419A79A54B44F3718E026F0137@bocnte2k3.boc.chevrontexaco.net>
To: www-ws-arch@w3.org 
This is really interesting.  

A real web service you send a hash of your content to the USPS they sign
it and anyone can see that the document is identical.    Includes a
times stamp.   Confidential -- the service never sees the actual data.

http://www.usps.com/electronicpostmark/welcome.htm
Received on Friday, 16 January 2004 16:12:15 GMT

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