Sanctions risks and holding Tether

Tether (USDT) is the most widely used crypto asset among Iranian users, but holding it carries a set of sanctions-related risks that are different in kind from price volatility. This article is a strictly factual, educational overview: every event is dated and sourced, nothing here is advice, and no part of it is a guide to circumventing any law. For scale: Chainalysis estimates Iran's crypto ecosystem reached roughly 7.78 billion dollars in 2025.

OFAC actions against Iranian exchanges

Three distinct moments need to be kept apart:

• 14 September 2022: OFAC (the US Treasury's Office of Foreign Assets Control) designated ten Iranian individuals and two companies connected to ransomware attacks and added 7 Bitcoin addresses to the SDN list. Nobitex itself was not designated in this action, but Chainalysis analysis found that the majority of the ransomware Bitcoin had been cashed out through Nobitex.
• 18 June 2025: Nobitex, Iran's largest crypto exchange, was hit by a cyberattack from the pro-Israel group Predatory Sparrow. By Elliptic's estimate more than 90 million dollars in assets (Bitcoin, Ether, Dogecoin and others) was sent to unspendable addresses and effectively destroyed, and a day later (19 June 2025) the exchange's source code was leaked. This was a cyberattack, not a government action.
• 2 June 2026: OFAC designated Nobitex itself directly for the first time, together with three other Iranian exchanges (Wallex, Bitpin and Ramzinex) and four Nobitex-linked individuals, under the Iranian financial-sector executive orders and the counter-terrorism authority. The US Treasury alleged the four exchanges had processed at least 40 billion dollars and that Nobitex handled more than 50 percent of all Iranian digital-asset inflows in 2025. The precise point: before this date, Nobitex had never been directly on the sanctions list.

Tether's own freeze capability

Tether's USDT smart contracts on Ethereum and Tron contain issuer-only blacklisting functions: a blacklisted address can no longer send or receive USDT, and the company can permanently destroy its balance. This capability is independent of where the tokens are held and applies to any address, whether on an exchange or in a personal wallet.

• 9 December 2023: Tether announced a voluntary policy of freezing all wallets on the OFAC SDN list, freezing 41 wallets the same day.
• 2 July 2025: in its largest Iran-linked freeze to that date, Tether blacklisted 42 wallets, more than half of which, per TRM Labs, had substantial exposure to Nobitex. The same firm estimates Iranian crypto flows fell 11 percent year on year to 3.7 billion dollars in January through July 2025, with July volumes down 76 percent year on year.
• 24 April 2026: OFAC sanctioned two wallets attributed to the Central Bank of Iran, and Tether, working with US authorities, froze roughly 344.2 million dollars in USDT, reported as the largest on-chain freeze of Iranian state-linked assets. Background: per an Elliptic report published on 21 January 2026, the Central Bank of Iran had acquired at least 507 million dollars in USDT between November 2024 and mid 2025, routed mainly through Nobitex.

The overall scale of freezes (per BlockSec): in 2025 alone Tether blacklisted about 4,163 addresses and froze 1.26 billion dollars in USDT, of which roughly 698 million dollars was permanently destroyed. The 2023 to 2025 total is about 3.29 billion dollars across 7,268 addresses.

How foreign exchanges behave

A Reuters investigation (4 November 2022) found that Binance had processed roughly 8 billion dollars in Iran-linked transactions since 2018, of which about 7.8 billion dollars moved between Binance and Nobitex; Binance said Iranian residents are prohibited and that these flows fell sharply after it made identity verification mandatory in September 2021. On 21 November 2023 Binance reached a 4.3-billion-dollar settlement with the US Department of Justice, FinCEN and OFAC, whose documents count the matching of more than 1.1 million trades between US persons and users inside Iran among the violations. The practical consequence for Iranian users: international exchanges routinely freeze or restrict accounts showing signs of an Iran connection, and this practice has tightened since 2023.

FATF status

Iran has been on the FATF blacklist (the 'High-Risk Jurisdictions subject to a Call for Action') with countermeasures in force since 21 February 2020. In the most recent statement (the plenary of 19 June 2026) Iran remains listed alongside North Korea and Myanmar, and the FATF explicitly calls on countries to extend countermeasures to virtual asset service providers: refusing branches and representative offices of Iranian exchanges and barring providers from operating in Iran.

Self-custody or exchange custody?

The factual bottom line of this comparison: self-custody removes the exchange-layer risks (account freezes, hacks, insolvency) but does not remove issuer risk, because Tether can blacklist any address at the smart-contract level; a large share of the addresses frozen in the events above were personal wallets. Exchange custody stacks both risk layers on top of each other, while relieving the user of key management.

Summary

For Iranian users, the sanctions risk around Tether is structural, not marginal: the issuer has both the capability and an extensive track record of freezing addresses, the largest domestic exchanges have been directly designated since June 2026, foreign exchanges restrict Iran-linked accounts, and the FATF position shows no clear path to change. Knowing these layers precisely, with dates and sources, is the first step of any informed decision. This article is not investment advice.