Tether extended OFAC wallet freezes to secondary-market USDT

Tether announced on December 9, 2023 that it was extending sanctions controls to USDT held in secondary-market wallets connected with people on the U.S. Treasury’s Office of Foreign Assets Control Specially Designated Nationals and Blocked Persons List.

The stablecoin issuer said it had decided on December 1, 2023 to initiate the voluntary policy and had frozen wallets associated with names already on the SDN List. The December 9 notice was an announcement of an issuer policy, not an OFAC rule, court order or finding that every holder of an affected wallet had committed a crime.

A change in Tether’s operating posture

The significance lay less in a single batch of addresses than in the standing policy. Tether said the controls it already applied to wallets on its own platform would now reach the secondary market, where USDT can move between addresses without a direct transaction with the issuer.

That represented a clear shift from Tether’s public position on August 24, 2022. In its response to OFAC’s Tornado Cash designation, Tether said that unilaterally freezing secondary-market addresses without verified instructions from authorities could disrupt investigations. It described its normal practice as freezing privately held wallets after an applicable request from a verified law-enforcement agent, while separately screening activity involving wallets it controlled.

By December 9, 2023, Tether was describing voluntary freezes for new SDN List additions and addresses previously added to the list. The available records establish an operational-policy change. They do not establish that OFAC had imposed a new legal duty on Tether between the two statements.

What the freeze meant

For an issuer-controlled token such as USDT, blacklisting can prevent the targeted address from transferring that token. It does not give Tether the wallet’s private key, reverse the address’s transaction history or automatically immobilize unrelated assets held at the same address.

That distinction mattered institutionally. A self-custodied wallet can still be subject to an issuer’s token-level controls. The December policy therefore strengthened Tether’s ability to respond to sanctions risk, while also making users more dependent on the issuer’s screening, address attribution, correction process and continued access to the relevant smart-contract controls.

OFAC’s October 15, 2021 virtual-currency guidance had already said sanctions compliance obligations apply to virtual-currency dealings as they do to fiat-currency dealings for persons subject to U.S. jurisdiction. The agency encouraged a tailored, risk-based program, including sanctions-list and geographic screening. Tether’s December 2023 announcement went beyond describing primary-market customer checks: it committed the issuer to voluntary action against listed secondary-market addresses.

The count and its limits

CoinDesk reported on December 9 that Tether froze 41 wallets and that several had interacted with Tornado Cash during the preceding six months. CoinDesk also reported that one address was associated with the Ronin Bridge attack. Those were contemporaneous reported findings based on cited blockchain-explorer records.

Tether’s own December 9 notice did not enumerate 41 addresses, publish transaction hashes, state the aggregate USDT balance, identify the blockchains involved or provide a wallet-by-wallet explanation. Coinburn therefore treats 41 as a contemporaneous reported count rather than an independently reconciled total. No price, market-capitalization, trading-volume or return claim is needed to assess the policy change.

What remained unknown on December 9

The event-day record did not disclose when each wallet was frozen, whether every address was explicitly listed by OFAC or merely connected to a listed person, what procedure an incorrectly affected holder could use, or whether any restriction would later be removed. It also did not show that freezing USDT eliminated the ability to move other tokens.

The verified development was narrower but consequential: on December 9, 2023, the issuer of USDT publicly adopted a more proactive sanctions posture for secondary-market wallets. That made centralized control a more visible part of stablecoin settlement and compliance risk.