In April, stablecoin issuer Tether froze $44.7 million in USDT at the request of Bulgarian police. Now, Texas-based firm Riverstone Consulting has formally filed a lawsuit accusing Tether of illegally freezing its tokens and causing it to miss a major investment opportunity. On April 4, Tether froze the assets of eight offline wallets controlled by Riverstone, according to a complaint filed in the Southern District of New York. The company contends that Tether is only guaranteed...