Tether froze $550 million in Iran-linked assets during 2026 but delayed blacklisting allowed $34.6 million to move

Tether has disclosed $550 million in frozen Iran-linked assets during 2026, but Senate investigators say delays in blacklisting wallets allowed at least $34.6 million to move freely after Israeli authorities flagged them. The conflicting accounts highlight whether issuer-controlled stablecoins strengthen or weaken sanctions enforcement.

• Democratic Senate investigators found that 84% of 846 Iran-linked wallets transacted exclusively or nearly exclusively in USDT.
• Senate staff calculated that $34.6 million in USDT moved out of wallets between Israeli seizure notice in June 2023 and Tether’s blacklist in March 2024.
• Tether disclosed two enforcement actions from April and July 2026 totaling at least $474 million, accounting for most of its $550 million freeze claim.

• $550M Iran-linked USDT Tether says it froze during 2026 across multiple enforcement actions
• 84% Share of 846 sanctioned wallets transacting predominantly in USDT instead of other cryptocurrencies
• $34.6M USDT that moved after Israeli alert but before Tether blacklisted addresses in March 2024
• $1.5B Total proceeds the Justice Department said moved through a wider Iran sanctions-evasion network

According to reporting by CryptoSlate, a dispute has emerged over Tether’s effectiveness in blocking illicit Iranian finance. On September 28 (Monday), Democratic staff of the Senate Permanent Subcommittee on Investigations released a preliminary report analyzing blockchain transactions across 846 wallets that US or Israeli authorities had sanctioned or targeted for seizure due to Iran connections. The report found that 84% of those wallets transacted exclusively or nearly exclusively in USDT, Tether’s dollar-pegged stablecoin. That same day, Tether issued a statement claiming that actions involving USDT had resulted in approximately $550 million being frozen across wallets connected to Iran’s central bank and Iranian sanctions networks.

Senate investigators identify $34.6 million that moved during enforcement gap

The discrepancy centers on timing and enforcement speed. The Senate report examined 39 wallets identified by Israel’s National Bureau for Counter Terror Financing in June 2023 as connected to Tawfiq Muhammad Sa’id al-Law, a figure the US Treasury later sanctioned for providing financial services to Hezbollah. According to the Senate subcommittee report, five of those addresses had been blacklisted, but the remaining 34 were not frozen until March 2024. Senate investigators calculated that more than $34.6 million in USDT moved out of those wallets after the Israeli seizure notice was published in June 2023 and before the remaining addresses were frozen nine months later.

Sen. Richard Blumenthal, the Connecticut Democrat and ranking member of the subcommittee, referred the findings to the Treasury and Justice departments, asking them to investigate Tether’s anti-money laundering and sanctions compliance.

Tether points to 2026 actions after Israeli alert period

The company did not directly address the Senate’s findings about 2023-2024 delays in its September 28 statement.

Instead, Tether highlighted recent enforcement actions. On April 23, Tether said it supported US authorities in freezing more than $344 million in USDT across two addresses after receiving information from the Treasury Department’s Office of Foreign Assets Control and other law enforcement. The following day, OFAC updated the Central Bank of Iran’s sanctions entry to add those same two blockchain addresses as digital-currency identifiers, linking the central bank to the IRGC-Qods Force and Hezbollah. In July, Tether reported freezing more than $130 million in USDT across four wallets as the Treasury expanded the Central Bank of Iran’s listed blockchain addresses. Those two disclosed actions total at least $474 million of the approximately $550 million Tether claims was frozen during 2026, though the company did not provide a wallet-by-wallet breakdown reconciling its disclosed examples with the full total.

CEO Paolo Ardoino said Tether acts when authorities provide credible information and argued that public blockchains give investigators visibility into fund movements that cash does not. The Senate report noted, however, that Tether acknowledged receiving a June 4 request for information and documents from the subcommittee but had not responded as of the report’s publication.

Broader forfeiture case targets $61 million in black-market oil proceeds

Federal prosecutors are pursuing a separate case that underscores the scale of Iran sanctions-evasion through crypto networks.

The Justice Department said it is seeking forfeiture of approximately $61 million in cryptocurrency allegedly tied to black-market Iranian oil sales. Federal prosecutors alleged that the wider network moved more than $1.5 billion in proceeds and said some funds were intended to benefit Iran’s government and military, including the Islamic Revolutionary Guard Corps. The forfeiture action targeted cryptocurrency allegedly connected to sanctions evasion and money laundering tied to Iranian petroleum sales.

The two enforcement efforts illustrate a core tension in issuer-controlled stablecoins: authorities can immobilize large balances once they identify addresses, yet delays before blacklisting can allow funds to move freely.

The BlockWest read. Tether’s disclosure of $550 million frozen in 2026 demonstrates that issuer controls do work when activated, but the Senate’s finding that $34.6 million moved during a nine-month gap raises questions about whether Tether’s compliance operations respond fast enough to urgent intelligence. The gap between Israeli alerting in June 2023 and Tether’s blacklist in March 2024 was not a technical limitation but an enforcement choice, leaving the critical question of whether delays reflect capacity constraints or acceptable risk tolerance.

Blumenthal has asked Treasury and Justice to investigate whether Tether’s practices violate the Bank Secrecy Act or the International Emergency Economic Powers Act, but the referrals do not establish that either violation occurred or that a new case has been opened. The outcome of that investigation, and whether it examines the 2023-2024 enforcement gap or focuses only on 2026 actions, will determine whether Senate findings of compliance failures lead to enforcement action or whether Tether’s recent disclosures satisfy regulators.

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