Stablecoin giant Tether said on Monday it has helped US authorities freeze nearly $550 million in Iran-linked USDT so far this year.
The company detailed two of those developments. The first, in April, locked more than $344 million in USDT across two TRON addresses. The company acted on information from the Treasury’s Office of Foreign Assets Control (OFAC) and US law enforcement. OFAC added both addresses to its sanctions entry for the Central Bank of Iran on April 24.
Treasury Names Crypto a Sanctions Target
That entry links the central bank to the Islamic Revolutionary Guard Corps (IRGC) Qods Force and Hezbollah. OFAC added four more TRON addresses to the same entry on July 14. Tether froze more than $130 million in USDT across those four wallets. Together, the two freezes come to more than $474 million. Tether’s release does not itemize the remaining ones.
“Public blockchains provide authorities with a level of visibility into the movement of funds that simply does not exist with cash, and Tether can act when credible information is provided by law enforcement,” said Tether CEO Paolo Ardoino.
In June, the US Treasury sanctioned Nobitex, Iran’s largest crypto exchange. It said the platform helped the central bank obtain stablecoins used to support the falling rial.
Treasury Secretary Scott Bessent then launched Operation Economic Outcast on August 24 against the Iranian regime’s financial networks. Its sectoral sanctions determinations name five sectors, starting with digital assets, technology, gold, aviation, and shipping. The Treasury said Iran increasingly uses cryptocurrency to evade sanctions, including for transactions linked to the IRGC.
On September 17, OFAC sanctioned Iranian crypto exchange BitBank, which it said is controlled by sanctioned financier Babak Zanjani. The Treasury alleged that BitBank moved hundreds of millions of dollars’ worth of Bitcoin (BTC) to the IRGC in June and July.
Tether Also Acts on Israeli Referrals
Tether said it has worked with Israel’s National Bureau for Counter Terror Financing (NBCTF) for several years. It has frozen more than 22 million USDT across over 40 cases the bureau referred to the company.
In September 2025, the NBCTF published 187 crypto addresses it tied to the IRGC. Blockchain analytics firm Elliptic reported that those addresses had received $1.5 billion in USDT, and Tether blacklisted 39 of them, freezing the roughly $1.5 million they still held. Though Elliptic noted that some of the addresses may belong to crypto services handling funds for many customers.
Across all its cases, Tether said it has helped freeze more than $4.9 billion, including more than $2.4 billion tied to US authorities.
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