It's hard for the government to track you down if you own a bitcoin or altcoin, if btc is legitimate, then maybe the government will ask people to take part in bitcoin to create personal profiles on the individual and assignments. Translation must be declared
Yes it is not easy to trace your btc by government, specially if you have not made any transaction using banks or any other such way. but if you are holding your bitcoin in a BTC wallet then it is not possible for the government to trace that how much bitcoin you are currently holding.