Most persons had continually have that notion that Bitcoin transactions are completely untraceable to the point where they finally spend it, but little  do they know  that this transactions can be followed up till they get tracked but mixers at a time did looked like they were going to come in the way of such tracking and tracing but I honestly do not know if they really do enough to not gwt any track able trace of the coin but if such coin is rather snet to an exchange that requires KYC , the chances continually remains high to trace the source and known the senders of the bitcoin.

With the government, there are some many possibilities that we may not be aware of which we not been aware of such is a security measure and that is why they are known only by the government and a few others so the tracing of Bitcoin and all of that is what the government can achieve, they have what it take and all the tools they .aye be needing  to carry that out actually.