In April of this year, stablecoin issuer Tether froze $44.7 million in USDT at the request of Bulgarian police. Now, Texas-based Riverstone Consulting has filed a lawsuit, alleging that Tether illegally froze its tokens and caused it to miss out on significant investment opportunities. According to the complaint filed in the Southern District Court of New York, Tether froze assets in eight offline wallets controlled by Riverstone on April 4th. The company claims that Tether's freezing of assets solely based on a request from the Bulgarian local police was "procedurally flawed" and failed to follow the formal procedures required by Bulgaria's International Mutual Legal Assistance Treaty, which requires the exchange of filings through central authorities and foreign affairs liaison channels. The complaint alleges that when Riverstone contacted Tether, they were told to communicate directly with the Bulgarian police, but the police have not responded. Tether's stablecoin currently has over $180 billion in circulation, and as of September 15th, Riverstone had cooperated with global law enforcement agencies to freeze $3.2 billion in USDT. (dlnews)