On November 21st, the Blockchain Association provided new support for six plaintiffs who sued the Office of Foreign Assets Control (OFAC) of the US Department of the Treasury for sanctioning the mixer Tornado Cash. In its amicus brief submitted to the US Court of Appeals, the association argued that OFAC's decision to approve the privacy protocol was not only illegal, but also exceeded its statutory authority, and was both "arbitrary and capricious," violating the US Constitution.