Coinworld News: On March 14, according to Whale Alert monitoring, 11,960,680 USDT held by a Tron chain address was just frozen by issuer Tether. Tether implements the USDT freezing mechanism through the blacklist functionality built into its smart contract. After an administrator calls the addBlackList function to add a specific address to the blacklist, all transfers in and out of USDT from that address become invalid, and the balance remains visible but is permanently locked. This is typically triggered by money laundering, fraud, or sanctions-related enforcement requirements. Tether has cumulatively frozen over $4.2 billion in USDT in recent years, with the majority occurring after 2023.