A Senate Report Puts 87% of Iran's Terror-Finance Wallets on USDT. The Ask Is a Freeze on Suspicion

What Happened

On Monday, September 28, Senator Richard Blumenthal of Connecticut, the ranking Democrat on the Senate Permanent Subcommittee on Investigations, released a preliminary report by Senate Democratic investigators on Tether's role in what it calls Iran's shadow banking system. The 28-page document analyzed blockchain transaction data from 846 wallets that had been sanctioned or otherwise blocked because of their association with Iran.

Per Blumenthal's release, 84% of the 846 had transacted exclusively or nearly exclusively in Tether's USDT, which coverage of the report says means more than 80% of a wallet's dollar volume. The 87% figure The Block reported is the share for the 757 wallets designated by Israel's National Bureau for Counter Terror Financing; for the 101 wallets designated by the Office of Foreign Assets Control, the share was 57%.

The report itself could not be retrieved for this piece.

The report's complaint is not that Tether lacks a freeze switch. It is that Tether waits to be told to use it. 'Outside of sanctions or seizure notices, Tether has also failed to act on wallets that bear strong indicators of illicit finance, despite ample information about their ties to Iranian entities or terrorist organizations being in the public domain,' the report states, as quoted by Crypto Briefing, and BloomingBit's summary says it urges a probe of the company's anti-money-laundering obligations.

Tether answered the same day with a count rather than a rebuttal. In a post on Monday it said it had helped freeze about $550 million in Iran-linked USDT in 2026: more than $344 million across 2 addresses in April, in coordination with OFAC and US law enforcement, that OFAC later designated as tied to the Central Bank of Iran, and more than $130 million across 4 wallets in July.

KuCoin's summary of the post puts Tether's cumulative freezes above $4.9 billion.

A Senate report and the issuer it targets agree on the mechanism and disagree only on the trigger. The evidence standard for pausing your stablecoin balance is being set in that negotiation, and you are not at the table.

What This Means for You

Read the 2 statements together and the dispute is narrower than the headlines. Both sides accept that a USDT balance is a liability Tether can immobilize at will, and both cite the same freezes as proof. The report wants the switch flipped on indicators, meaning analytics and public reporting, before any agency issues an order.

Tether's record says it flips the switch on orders, and sometimes, as the Thai plaintiffs suing it in the Southern District of New York allege, on a verbal request 3 months ahead of the warrant. The skeptical reading deserves a line: the dataset is built from wallets that were already sanctioned or blocked, some presumably by Tether itself, so USDT's share partly measures where enforcement has already looked.

That does not weaken the practical lesson. The evidence standard for immobilizing a stablecoin balance is being negotiated between a company and a Senate committee, and neither party in that negotiation is you.

The action items follow from issuer control. Treat USDT as a transit asset, not a savings asset: the minutes between an exchange and a wallet, not a year of expenses. Holding it in your own wallet does not help here; your private keys sign the transfer, but the issuer settles it, and an address on the wrong list stops settling.

Keep the counterparty history of any stablecoin balance clean, because a freeze on indicators means someone else's conduct can lock your funds. Bitcoin has no issuer to petition: an address can be listed, but nobody can stop it from settling. That is the limit of this story as much as its point, because the clustering that turned 846 designations into a map of Iran's network reaches a bitcoin holder at the exchange, where source-of-funds questions arrive with the same public-domain indicators attached.

Keep records of where your coins came from, and keep the switch-free asset for the money you cannot afford to have paused.

What to Watch

Whether the Treasury Department or the Justice Department, the 2 agencies Blumenthal referred the findings to, opens the review the report asks for is the first checkpoint, and whether a full subcommittee report follows the preliminary one is the second. The Thai plaintiffs' case in the Southern District of New York is the live test of a freeze that precedes legal process, and a ruling there would set the floor the Senate report wants raised.

Any change in Tether's stated policy from freezing on notice to freezing on indicators would show up first in its own freeze announcements, which is why the count it published on Monday is worth reading as a baseline rather than a defense.

Tracked entities this report names, with total coverage across the archive. Follow one into the Actor Network to see every report it appears in.

Other reports that name the same tracked actors — a different thread than “related,” which follows wording. These are linked by who appears in them.