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"... and wielded at least one mysterious source of information to “help track down senders and receivers of Bitcoins,” according to a top-secret passage in an internal NSA report dating to March 2013""<br><br> Source:<br> <a href="https://www.documentcloud.org/documents/4408020-Pages-From-OAKSTAR-Weekly-2013-03-29.html#document/p1" target="_blank">https://theintercept.com/document/2018/03/20/pages-from-oakstar-weekly-2013-03-08/</a>