I mean in a bitcoin economy. The only reason that example works is because the input fiat does not have the transparency of a blockchain behind it. If you were

I mean in a bitcoin economy. The only reason that example works is because the input fiat does not have the transparency of a blockchain behind it. If you were end to end using bitcoin, ie, drug dealer gets paid in bitcoin, then if you know its drug money you can blacklist it forever because its always traceable.