First it has to be stated that Cryptocurrencies are mostly used for legal transfers between legitimate partners and are becoming more and more popular in our society. Any heavy regime of new regulations would make all transactions costlier and less convenient. Such negative economic impact is opposing the need of monitoring the financing structures of organized criminal and terrorist organisations. With the increasing importance of cryptocurrencies, a completely new field of complex problems is arising through the implied anonymity and complexity or sheer impossibility to track transfers in the dark net. As regulations in this new financial market will be difficult to enforce, it is necessary to establish international cooperation and capacity building to implement some possibilities for law-enforcement and intelligence entities to monitor the illegal parts of the capital flowing in these systems. To solve this situation, the focus should lie on the attempts to make the risk of detection of such transfers higher for the parties involved. Without interfering too strongly with the new financing system developing, this process asks for improved compliance and cooperation on all levels and capacities.