The freezing of Iran-linked funds demonstrates how centralized stablecoin issuers can enforce US sanctions directly on blockchain networks, bypassing traditional banking channels. Over a period of less than three months, US authorities leveraged Tether's ability to control its dollar-pegged USDT token to block roughly $475 million connected to Iran. On July 14, the government sanctioned four wallets on the Tron blockchain that collectively held around $131 million in USDT. These addresses were reportedly linked to networks facilitating transactions on Iran's behalf. Because Tether retains the technical capacity to freeze tokens held in specific wallets, it can render targeted funds unusable at Washington's request. The actions highlight the growing role of stablecoins as instruments of financial enforcement, raising questions about censorship resistance and the concentration of power among major issuers operating within US regulatory reach.
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