crypto currencies are not designed to be anonymous, like quite the reverse. So if i was going to set up a sanctions busting operation I probably wouldn't do it by publishing all my accounting in my books for the entire world to read. It may be a little bit more complicated than that in practice, because the trick is tying wallet addresses with actual real word entities. But you know, police and organizations like the fbi have got quite a bit better at doing that in the past few years.