The NSA is doing a great job marketing darkcoin:



If they can store all phone calls made, keeping a store of all bitcoins and linking them down the line is trivial

http://www.washingtonpost.com/world/national-security/nsa-surveillance-program-reaches-into-the-past-to-retrieve-replay-phone-calls/2014/03/18/226d2646-ade9-11e3-a49e-76adc9210f19_story.html