Tether freezes 131 TRON wallets tied to ISIS-K

On July 1, the U.S. Treasury’s Office of Foreign Assets Control added 134 crypto addresses linked to the Islamic State Khorasan Province to the Specially Designated Nationals list. The update included 131 TRON addresses and three Monero addresses. Tether froze balances on the 131 TRON wallets.

Blockchain analytics firm Chainalysis reported the 131 TRON wallets received more than $1.4 million since 2023 and sent out more than $880,000. Those figures show transaction flows and do not indicate exact balances at the time of the freeze.

OFAC’s virtual-currency guidance permits adding digital-currency addresses to the sanctions list. When an address is listed, exchanges, custodians and compliance vendors must screen for exposure. For a stablecoin with issuer controls, the issuer can disable token balances at the contract or issuer-control layer.

Tether introduced a voluntary wallet-freezing policy in December 2023. The company reported it supported freezing more than $344 million in USDT in coordination with OFAC and U.S. law enforcement in April, and that the T3 Financial Crime Unit froze over $450 million tied to illicit flows in May. Those actions were separate from the ISIL Khorasan designation.

TRON-based USDT is commonly used for low-cost, fast dollar transfers. Chainalysis reported several of the designated wallets moved funds to Syria-based crypto exchangers and had interactions with mainstream services. When a listed address holds freezeable tokens, exchanges and payment processors must trace counterparties, deposits, withdrawals and any linked addresses.

The three Monero addresses illustrate limits to issuer-based freezes. Monero transactions are private and balances are controlled only by private keys. There is no central issuer that can disable Monero balances on chain. OFAC can list Monero addresses and covered firms can screen where visibility exists, but there is no issuer control equivalent to freezing stablecoin balances.

In April, FinCEN and OFAC proposed rules that would require permitted payment stablecoin issuers to build technical capacities to block, freeze and reject impermissible transactions. Regulators have described stablecoin issuers as part of payment infrastructure with specific compliance duties.

A freeze affects only remaining token balances; prior transfers require tracing through counterparties and intermediaries. Funds can be routed through assets or venues without issuer controls, which calls for additional investigative steps.