I've read that SN could never touch his BTC because they would definitely be able to trace him. I also read that with quantum computing the US government already knows who he is. They were able to take all the known emails he wrote as well as the white paper and feed that into a program to create writing signatures. These signature keys were then matched up against all the massive email data and other data the NSA has collected the world over from Yahoo, Google, Amazon etc etc. So if he has had any presence on the internet after he disappeared then he most definitely has been identified. Since quantum computing is still a guarded secret they do not want to reveal this information. It is likened to the Manhattan project. The world didn't know we had an atom bomb until we devastated Hiroshima and Nagasaki.