Tether has frozen more than $514 million USDT across 370 addresses in the past 30 days, mostly on Tron.BlockSec says Tether blacklisted 4,163 addresses in 2025, freezing a total of $1.26 billion USDT on Ethereum and Tron.The growing use of blacklists underscores how centralized stablecoins now operate as de facto enforcement tools embedded in crypto rails.