Full Breakdown
Senate Report Flags Tether’s USDT as Key Tool in Iran’s Shadow Banking Network
By Drooid · · How we work
Core Findings of the Senate Investigation
The Senate Permanent Subcommittee on Investigations released a 28-page report on September 28, 2026 that examined 846 cryptocurrency wallets sanctioned by the United States or Israel for links to Iran, Hezbollah, Hamas, the Houthis and other entities. The subcommittee found that 84 % of the wallets transacted exclusively or nearly exclusively in Tether’s USDT stablecoin. A separate analysis of the 757 Israel-sanctioned wallets reported 87 % USDT usage, while the 101 wallets on the U.S. OFAC list showed 57 %. The report calls USDT a “central pillar” of Iran’s shadow-banking system, enabling the regime to move value around sanctions and finance regional proxies.
Background and Legislative Context
The investigation follows the Treasury Department’s “Operation Economic Outcast,” launched earlier in 2026 to tighten sanctions on Iran’s financial networks. The forthcoming GENIUS Act, set to take effect in January 2027, would make it illegal for U.S. entities to offer digital assets from foreign issuers that do not comply with lawful freeze orders. Senator Richard Blumenthal (D-Conn.), ranking member of the subcommittee, sent letters to Treasury Secretary Scott Bessent and Attorney General Todd Blanche urging a review of Tether’s anti-money-laundering controls.
Data and Statistics
- Wallet usage: 84 % (846 wallets) and 87 % (757 Israel-sanctioned wallets) of transactions were in USDT.
- Transaction volume: The report estimates roughly $7.8 billion in USDT-denominated activity over the past year, with about half linked to the Islamic Revolutionary Guard Corps.
- Government-linked freezes: Tether announced on September 28, 2026 that it had frozen approximately $550 million in Iran-linked USDT during 2026. The company detailed two major actions: more than $344 million frozen across two addresses on April 23 and more than $130 million frozen across four TRON wallets on July 14. Independent on-chain analysis calculates the combined amount at roughly $474 million, leaving about $75 million unaccounted for in the aggregate figure.
Official Statements & Responses
Senator Blumenthal called on the Treasury and Justice Departments to assess Tether’s compliance with AML and sanctions rules.
Conflicting Reports & Gaps
- Usage percentages: The Senate report cites 84 % USDT usage across all 846 wallets, while the Israeli-sanctioned subset reports 87 % usage; the figures are not reconciled.
- Freeze totals: Tether’s public statement aggregates freezes to $550 million, yet on-chain data for the April and July actions sum to about $474 million, leaving a discrepancy of roughly $75 million.
- Wallet list transparency: The subcommittee’s findings are preliminary and do not publish the underlying wallet addresses, preventing independent verification.
Verbatim Quotes
- “Tether has consistently demonstrated that USDT is not a haven for sanctioned actors, terrorist organizations or criminal networks,” — Paolo Ardoino, CEO
- “Financial crimes do not become invisible just because they are linked to blockchain. In many cases, it’s quite the opposite. Records [in the distributed ledger] are publicly accessible,” — Paolo Ardoino, CEO
What’s Next
The subcommittee’s letters request that Treasury and the Justice Department provide a response by early October on whether any prior investigations into Tether have been narrowed, paused, or closed, and whether further enforcement action is warranted. The GENIUS Act provisions could impose new compliance obligations on stablecoin issuers beginning in January 2027.