TL;DR:
- Democratic staff on the Senate Permanent Subcommittee on Investigations analyzed 846 Iran-linked wallets and found 84% transacted exclusively or almost exclusively in USDT, prompting Blumenthal to seek federal investigations.
- The inquiry criticizes Tether’s historical wallet-freezing practices but does not establish that the company violated federal law.
- Tether says it froze roughly $550 million tied to Iran in 2026 and has helped authorities freeze over $4.9 billion globally.
U.S. Senator Richard Blumenthal is escalating scrutiny of Tether after Democratic staff on the Senate Permanent Subcommittee on Investigations released an official report summary examining cryptocurrency flows tied to Iran and regional proxies. Investigators analyzed 846 wallets that had been sanctioned or targeted for seizure, finding 84% transacted exclusively or almost exclusively in USDT. Blumenthal argues the stablecoin has become a major channel for sanctions evasion, and asked the Treasury and Justice departments to investigate Tether’s compliance practices.
Senate Inquiry Focuses on USDT’s Role in Iran-Linked Networks
The inquiry says USDT helped provide a high-liquidity payment rail to actors connected with Iran, including transactions involving the country’s central bank. The findings also touch on Iran’s Central Bank and USDT activity outside traditional banking channels. Investigators also said two sanctioned Iranian oil traders moved more than $603 million in USDT between 2021 and 2025 through a network touching Iranian institutions and regional groups. Those findings underpin Blumenthal’s call for federal investigators to examine potential sanctions and anti-money-laundering violations.
The report also criticizes Tether’s historical wallet-freezing practices. Democratic investigators said the company did not comprehensively and consistently freeze designated wallets before 2024 and cited one case in which $34.6 million continued moving after sanctions designation. Tether’s ability to blacklist assets has become central to broader debates over how USDT freezes are executed. The inquiry frames delayed or incomplete freezes as a compliance weakness, rather than concluding that Tether itself committed a legal violation.
Tether has emphasized its cooperation with authorities. In a statement published the same day as the report, the company said actions involving USDT froze roughly $550 million across wallets U.S. authorities linked to Iran’s central bank during 2026. That included more than $344 million frozen in April, consistent with earlier Iran-linked USDT enforcement actions. Tether also said it has worked with more than 340 agencies across 67 countries and helped freeze over $4.9 billion in assets. Its response presents issuer-level controls as an enforcement tool rather than a sanctions loophole.
The dispute now centers on whether Tether’s compliance systems adequately prevented sanctioned networks from using USDT before freezes occurred. Blumenthal has referred the findings to Treasury Secretary Scott Bessent and Attorney General Todd Blanche, requesting investigations. No finding cited in the materials establishes that Tether violated federal law, leaving that question to any government review or enforcement process.
