Re:ZCash Will Be a Truly Anonymous Blockchain-Based Currency
by livingparadox on Thursday October 27, 2016 @01:10PM
(#12806988)
To prosecute your stuff, they still have to confirm its existence. You don't have to prove it doesn't exist.
The US certainly has had cases prosecuting "stuff" where said stuff is cryptocurrency. See "United States v. 178.95842915 Bitcoins" [0], which appears to be a civil forfeiture case [1][2].
[0] https://www.usmarshals.gov/assets/2016/bitcoinauction/index....
[1] https://www.pacermonitor.com/public/case/10752506/United_Sta...
[2] https://docs.justia.com/cases/federal/district-courts/washin...