News for hackers. Stuff that matters.
Re:Twitter sues U.S. government over ability to disclose sur... by rsync on Wednesday October 08, 2014 @12:02PM (#8427623)
A bit easier is to simply include a news headline in the signed message:

http://www.rsync.net/resources/notices/canary.txt

It's not as sophisticated as the blockchain, etc., but about as good - if you pick sensitive pieces of financial news it's clear you could not have known about them in advance. Or sports results.

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