Tether Freezes 131 TRON Addresses After OFAC ISIS-K Update

Stablecoin issuer acts on sanctions designation within hours, testing regulatory expectations for token control

Tether froze USDT balances on 131 TRON addresses on July 1 following an updated OFAC sanctions designation that added 134 crypto addresses linked to ISIS-K, the Islamic State Khorasan affiliate active across Afghanistan, Pakistan, and parts of Central Asia.

The frozen addresses had received approximately $1.4 million since 2023 and sent roughly $880,000, according to blockchain analysis. OFAC’s update included three Monero addresses, which cannot be frozen by an issuer because accounts are controlled through private keys rather than a centralized contract layer.

The action underscores the technical asymmetry between stablecoin issuers and other crypto assets. Tether and other token issuers can disable balances at the contract or issuer-control layer, a capability that distinguishes USDT from decentralized alternatives. TRON-based USDT has become a common rail for fast, cheap dollar transfers, making the network a frequent target for sanctions compliance.

Tether introduced a voluntary wallet-freezing policy for OFAC SDN List activity in December 2023. By April 2024, the company said it had frozen more than $344 million in USDT in coordination with OFAC and U.S. law enforcement. In May 2024, the T3 Financial Crime Unit, a collaboration between Tether, TRON, and TRM Labs, froze more than $450 million tied to illicit crypto flows.

The speed of the July 1 freeze raises questions about regulatory expectations. “The same control that lets an issuer respond to a sanctions designation can become a standing expectation from regulators, law enforcement, exchanges, and analytics firms,” according to analysis of the enforcement action.

FinCEN and OFAC proposed AML/CFT and sanctions compliance requirements for permitted payment stablecoin issuers in April, including technical capacities to block, freeze, and reject impermissible transactions. Those requirements, if enacted, would formalize the issuer-level freezing that Tether has already adopted voluntarily.

The distinction matters for privacy-focused assets. Monero addresses in the OFAC update cannot be frozen unilaterally by any issuer, a structural feature that regulators have flagged in sanctions enforcement discussions.

Tether did not disclose the exact balance amount frozen in the 131 TRON addresses, only historical flow totals. The company also did not detail the operational procedures or legal process followed to execute the freeze.