One takeaway: it’s not just another price-boosting story—senate Republicans’ minority group directly named $USDT as the main conduit for Iran’s shadow banking system.
Sep 28, a standing Senate investigative subcommittee (PSI) minority/Ranking Member Blumenthal released a 28-page preliminary report (Tethered to Terrorism). The method is hard-nosed: on-chain forensics of 846 wallets that are already sanctioned or linked to Iran and its regional agents—the report says about 84% of them almost exclusively routed funds via $USDT; and in another figure, among 757 wallets involved in terrorism financing, about 87% were primarily using $USDT.
The point is not the old line “Iran uses stablecoins,” but rather that the report pins the blame on the issuer side: it alleges that Tether did not take sufficiently proactive steps to freeze publicly linked wallets; it gives an example that transactions continued to flow even after sanctions, amounting to about $34.6 million; and it highlights that two addresses involved in sanctioned oil smuggling moved more than about $603 million via the $USDT network over four years. The report also estimates that the crypto channels on the Iranian side as of 2025 are at least in the order of about $2.0 billion (the report’s wording, ≠ amounts already convicted).
Tether’s official response on the same day: In 2026, it has cooperated with the U.S. authorities to freeze about $550 million worth of Iranian-related assets linked to $USDT (in April, about $344 million across two addresses; in July, about $130 million across four addresses). CEO Paolo Ardoino emphasized, “If there’s credible law-enforcement information, we will act,” and said public blockchains are more traceable than cash. Blumenthal also sent a letter to the attorney general and the Treasury secretary, urging them to investigate potential sanctions/banking-law issues.
My view in one sentence: the larger the liquidity of stablecoins, the more the sanctions standoff turns into an institutional war over the issuer’s “freeze response speed”—the report does not equal a law-enforcement case closure, and a freeze does not equal clearing the allegations. ≠ Sep 15 SDNY posting about a civil forfeiture of about $61.19 million in $USDT tied to Iranian oil.
Source: The U.S. Senate PSI minority party PDF (Sep 28) + The Block/CoinDesk + Tether’s official blog. Not investment advice.