Bitcoin may be becoming the single common currency used by cyber criminals across the European Union, said Europol. In its 2015 internet organised crime threat assessment, it warned about, among other things, money muling and laundering services that required concerted and coordinated international law enforcement action, and that Bitcoin was featuring heavily in many EU law enforcement investigations. Although there is no single common currency used by cybercriminals across the EU, it is apparent that Bitcoin may gradually be taking on that role.