You can also submit a hash of the documents of the event to the Bitcoin blockchain in a transaction. There are so many who can confirm it was published at a certain date that it can't be practically faked.
- Sent from my phone Den 12 nov 2013 00:30 skrev "Peter Gutmann" <pgut...@cs.auckland.ac.nz>: > Warren Kumari <war...@kumari.net> writes: > > >I've often wondered if there is a clever way to do the inverse -- > basically > >to have a "latest" timestamp? This seems like a much harder problem -- 'm > >looking for a "movie plot" type solution that the public can easily > >understand… > > You could do it with a physical one-way function. Take a photo of the > victim > on top of the WTC and you know that it can't have been occurred after > 9/11. To > generalise it, photograph the victim in front of some documented object and > then destroy the object. I'm assuming in the movie-plot scenario that > someone > who's kidnapped a victim won't worry about blowing up a statue in a park or > performing whatever the physical one-way operation is. Depending on how > evil > your movie-plot villain is (and how convoluted the plot will get), he/she > could kill random strangers after photographing them with the victim, in > order > to fix a point in time. > > Peter. > > _______________________________________________ > cryptography mailing list > cryptography@randombit.net > http://lists.randombit.net/mailman/listinfo/cryptography > >
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