Actually, Don, the use of block chain technology for use in authenticating digital preservation has already been proposed by Kevin Lagaisse, in a blog dated 29 January 2016: http://kevin.lagaisse.fr/une-blockchain-pour-larchivage-a-valeur-probatoire/.
Sorry, it's in French. But the question of ensuring authenticity over the very long term is a very hot issue in Europe.
Best regards, and a good weekend to all.
Fred
Frederic J. Grevin
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