[reqctomaniac]

You have to use your bitcoins someday. Either to buy real currency or real goods. Then you know where the money went TO. Tracing the transactions back (where the money came FROM) is then not a big deal - full history is in the blockchain.

So as long as you don't do a transaction that connects your identity to any bitcoin address, you are fine. but to use bitcoins you are almost always required to do it (its an electronic financial transaction, they are governed by law to have an identity, but of course you can find entities who do not follow these laws).

[aaronbasssett]

Only as you say if you convert them into a "real" currency. If they only used their Bitcoin to purchase goods (such as VPS) which was not tied to a physical address, then they could still remain anonymous.

As for where the Bitcoins came from, I'm sure the author of this document would have some digital assets they could sell on the darknet to acquire some Bitcoin. Where those Bitcoin originated then would not be their problem.