...that is cash doesn't leave any trace...!
On the contrary, the design of cash is for its every step to be tracked-- where it goes, whose hands has it passed through, where is it deposited, where does it come from, etc. A transaction with cash must have traces. That is the legal way, at least. And because the crooks are using cash more than any other, there is what we call money laundering, for everything to appear clean. The problem with the designers and controllers of this cash is that they are now pointing at Bitcoin as the alternative or even preferred way of doing crimes because of anonymity. It is transparent as to the fact that all transaction records are public, but as to who and what particular transactions are involved, Bitcoin does not provide them.
