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    There are date-times embedded in the block headers in bitcoin... although they are not enforced by the protocol, they are generally trusted to be at least "ballpark" accurate (i.e. well within 1 day accuracy)... it's also possible to inspect the entire blockchain from the block in question until today to make sure the date-times are monotonically increasing Commented Dec 17, 2014 at 15:12
  • Sorry to take too long to accept an answer. The hacker probably used a trusted entity, I couldn't find a reasonable way to protect the content authorship without a trusted entity. Commented Mar 12, 2015 at 8:53