A Senate investigation has placed Tether’s USDT stablecoin at the center of alleged Iranian sanctions evasion and terrorism-financing activity, concluding that the token was the predominant asset used by a large set of wallets linked to Iranian networks. The report, released Monday by Democratic investigators on the Senate Permanent Subcommittee on Investigations, also urged the Justice Department and Treasury Department to examine potential violations of sanctions and banking laws.
The 28-page report was led by Senator Richard Blumenthal, the panel’s top Democrat. Investigators said they reviewed blockchain data tied to 846 cryptocurrency wallets that had been sanctioned or otherwise blocked because of links to Iran, along with 757 wallets they described as implicated in Iranian terrorism financing.
According to the report, 87% of the 757 terrorism-financing-linked wallets “predominantly transacted in USDT,” the dollar-pegged stablecoin issued by Tether. The finding places the world’s largest stablecoin by circulation under fresh political scrutiny in Washington, where lawmakers are increasingly focused on whether dollar-backed tokens can be used to move funds around sanctions restrictions.
Senate report examines USDT’s role in Iranian networks
The investigation described USDT as a common settlement asset for Iranian cryptocurrency exchanges and Iran-linked financial networks. It attributed that usage largely to the token’s liquidity, which can make it easier for users to enter and exit crypto positions without taking on the volatility associated with assets such as Bitcoin or Ether.
For sanctioned entities, a token designed to track the dollar can also offer a practical bridge between local currency markets, crypto trading venues and cross-border transfers. The report argues that this feature has made USDT a recurring tool within what it calls Iran’s “shadow banking system.”
The document does not treat every USDT transaction involving Iran as illicit. Instead, it focuses on wallets that investigators said had already been sanctioned, blocked or otherwise connected to terrorist financing. Its central allegation is that Tether repeatedly failed to freeze certain wallets tied to illicit activity quickly enough or consistently enough.
Blumenthal’s letters to Attorney General Todd Blanche and Treasury Secretary Scott Bessent call for investigations into whether Tether or related parties may have violated US sanctions or banking laws. The request raises the prospect of a more formal federal response, though the Senate report itself does not establish legal liability.
Tether cites $550 million in Iran-linked freezes
Tether published a statement Monday saying it had helped freeze $550 million worth of USDT linked to Iran over the past year. The disclosure arrived on the same day as the Senate report and offered a sharply different account of the company’s enforcement record.
The company’s figure suggests that Tether has participated in substantial interventions involving Iran-linked funds. Yet it does not directly answer the Senate investigators’ allegation that certain flagged wallets remained operational or that the company’s blocking practices were insufficient.
Unlike decentralized assets with no central issuer, USDT can be frozen at the token-contract level by Tether. That capability has made stablecoin issuers increasingly important participants in sanctions enforcement, law-enforcement investigations and asset-recovery efforts. It also means decisions over which addresses to block can have immediate consequences for users holding tokens on public blockchains.
The Senate report’s criticism is therefore aimed less at whether USDT is technically capable of being restricted than at the timing, scope and consistency of those restrictions in cases involving Iranian entities and alleged terrorist financing.
Political links add pressure to inquiry
The report also drew attention to Cantor Fitzgerald’s relationship with Tether. Commerce Secretary Howard Lutnick previously led Cantor Fitzgerald, which the report identifies as a custodian for the stablecoin issuer. The document says Lutnick’s sons have since taken leadership roles at the financial firm.
It further noted that Bo Hines, previously executive director of the White House Crypto Council, is now chief executive of Tether U.S. The report presents those connections as relevant context for federal oversight, particularly because the requested investigation would involve agencies operating within the same administration.
Neither the report’s references to Cantor Fitzgerald nor its discussion of former officials amount to allegations of wrongdoing by those individuals. Their inclusion reflects the investigators’ concern about how closely stablecoin infrastructure, major financial intermediaries and federal policymaking can intersect.
Stablecoin enforcement becomes a policy test
The investigation arrives as stablecoins are increasingly treated as part of the dollar-payment system rather than as a niche crypto product. USDT’s scale and use across blockchains have made it useful for legitimate trading and payments, while also creating a large target for sanctions evaders seeking a liquid dollar-linked asset outside conventional banking rails.
The report’s figures could intensify demands for stablecoin issuers to use sanctions-screening tools, promptly act on law-enforcement requests and provide clearer evidence of how blocked-address policies operate. They may also sharpen debate over whether federal stablecoin rules should impose explicit duties on issuers to freeze tokens associated with sanctioned persons or entities.
For USDT users, the immediate issue is operational rather than a predicted market shock: tokens held at an address subject to an issuer freeze can become unusable even though the underlying blockchain remains active. The Senate inquiry underscores how stablecoins combine the transferability of public networks with issuer-level controls closer to those found in the traditional financial system.
Whether Blumenthal’s requests lead to a Justice Department or Treasury investigation remains unresolved. The report has nonetheless put Tether’s approach to Iran-linked wallets, and the federal government’s expectations for stablecoin enforcement, under a more direct spotlight.
Concerned about stablecoin risks? Deepen your understanding of regulatory impacts by exploring our guide on stablecoin regulation today.
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