The U.S. Department of the Treasury's Financial Crimes Enforcement Network (FinCEN) has proposed a new rule to increase transparency in Convertible Virtual Currency Mixing (CVC mixing), which is identified as a primary money laundering concern. The rule aims to combat the use of CVC mixing by illicit actors, including terrorist groups and cyber criminals. The proposal follows multiple actions by the Treasury to target illicit finance involving the use of mixing services, including the designation of Blender.io and Tornado Cash, which provided mixing services used in significant virtual currency heists.