> This scheme is called a digital notary and there are companies that have
> perfected the technique.  One such, a spin-off of BellCore research (who
> had a nice paper on this technology a few years ago) is Surety.
> 
> Surety is found at:
> 
> http://www.surety.com/index-nn.html

Thanks a lot for the links!

Horst

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