The Justice Department has launched its first criminal prosecution involving the alleged use of cryptocurrency to evade U.S. economic sanctions, a federal judge disclosed Friday.

In an unusual nine-page opinion, U.S. Magistrate Judge Zia M. Faruqui of Washington, D.C., explained why he approved a Justice Department criminal complaint against an American citizen accused of transmitting more than $10 million worth of bitcoin to a virtual currency exchange in one of a handful of countries comprehensively sanctioned by the U.S. government: Cuba, Iran, North Korea, Syria or Russia.

In the ruling, the judge called cryptocurrency’s reputation for providing anonymity to users a myth. He added that while some legal experts argue that virtual moneys such as bitcoin, ethereum or Tether are not subject to U.S. sanctions laws because they are created and move outside the traditional financial system, recent action taken by the Treasury Department’s Office of Foreign Assets Control require federal courts to find otherwise.

“Issue One: virtual currency is untraceable? WRONG … Issue Two: sanctions do not apply to virtual currency? WRONG,” Faruqui wrote, adopting and crediting the staccato-delivery style of the late American political commentator John McLaughlin and his long-running television program, “The McLaughlin Group.”

“The Department of Justice can and will criminally prosecute individuals and entities for failure to comply with OFAC’s regulations, including as to virtual currency,” Faruqui said.