MetaEra's Riverstone Consultancy Inc. has filed a lawsuit against Tether to unfreeze 44.7 million USDT, valued at $44 million, frozen since April 2025. The freeze was initiated at the request of Bulgarian police, and the funds are held in eight offline wallets. The lawsuit alleges that the freeze violated international protocols requiring communication between Bulgarian authorities and foreign diplomatic channels. Cryptocurrency forensic analysis indicates potential links to Ponzi schemes such as BETL, Pegasus Ride, and LSSC.