Tether said September 28 that it supported approximately $550 million in Iran-linked USDT freezes during 2026, citing actions involving wallets identified by U.S. authorities as connected to Iran’s Central Bank and Iranian sanctions networks. The disclosure came as a Senate investigation examined the use of Tether’s dollar-pegged stablecoin in Iran’s shadow banking system.
Tether’s statement is independently supported in part by two major enforcement actions. In April, the company said it supported the freezing of more than $344 million in USDT across two addresses. In July, more than $130 million in USDT was frozen across four additional TRON wallets after the U.S. Treasury expanded sanctions on identifiers linked to the Central Bank of Iran.
The two publicly detailed actions, however, add up to roughly $474 million to $475 million. Tether did not provide a separate breakdown explaining the remaining amount behind its approximately $550 million figure.
Tether Links the Freezes to U.S. Sanctions Enforcement
Tether said the April freeze followed information supplied by the Office of Foreign Assets Control and U.S. law enforcement. The company said more than $344 million in USDT was frozen across two addresses, preventing further movement of the tokens.
OFAC subsequently added those addresses as digital-currency identifiers under its Central Bank of Iran designation. The agency’s April 24 update identifies the two TRON addresses and links the Central Bank of Iran entry to the IRGC-Qods Force and Hizballah.
The second major action came in July. OFAC’s July 14 update added four additional TRON addresses to the Central Bank of Iran’s sanctions record. The listed addresses were:
- TNiq9AXBp9EjUqhDhrwrfvAA8U3GUQZH81
- TTiDLWE6fZK8okMJv6ijg42yrH6W2pjSr9
- TAhwhFv3JpK39Nc2mW8LPCcoTisutiRfp
- TJdgB1k6ot3f2nLuZug6D8eD3HavTmzmSK
- TXGHxdYbGy574z5hBu4LNzq9NzjZQ9bhUf
- TFQbqaNbmq2xsVor2NbufLkYZvxFC9wC7k
The first two addresses were part of the April designation; the latter four were added in July. Chainalysis reported that the four newly designated wallets had received more than $165 million in stablecoins and that approximately $131 million was frozen by Tether.
Importantly, these actions were issuer-level freezes rather than conventional government seizures or blockchain transfers. Tether’s control over USDT allows it to prevent tokens held at designated addresses from being transferred.
Independent Data Puts the Disclosed Freezes Below $550 Million
Chainalysis reported after the July action that Tether had frozen almost $475 million from wallet addresses identified by OFAC as belonging to the Central Bank of Iran.
That figure is consistent with the publicly documented April and July actions: more than $344 million in April and about $131 million in July.
Tether’s September statement nevertheless says the two actions together amount to approximately $550 million. The company also describes the total as covering wallets connected to the Central Bank of Iran and Iranian sanctions networks, which may indicate that the figure includes additional Iran-linked cases that were not itemized in the announcement.
No detailed reconciliation of that approximately $550 million total was included in Tether’s statement. MemeBlock therefore treats $550 million as a company-reported aggregate, rather than an independently reconstructed figure.
This distinction matters because the underlying sanctions actions are independently documented. The discrepancy concerns the scope and calculation of Tether’s broader 2026 aggregate, not whether the April and July freezes occurred.
Senate Investigation Adds Scrutiny of Tether’s Compliance Controls
The disclosure arrived on the same day the Democratic staff of the Senate Permanent Subcommittee on Investigations released a preliminary report examining Iran’s use of cryptocurrency.
The report analyzed blockchain data from 846 cryptocurrency wallets that had been sanctioned or targeted for seizure because of their association with Iran and regional proxies. It found that 84% had transacted exclusively or nearly exclusively in USDT, according to the report.
The Senate investigators argued that USDT had become a major component of Iran’s cryptocurrency-based shadow banking network. Their analysis also identified more than $603 million in USDT moved by two sanctioned Iranian oil smugglers, Alireza Derakhshan and Arash Estaki Alivand, between 2021 and 2025.
Those findings are allegations and analytical conclusions from the Senate investigation, rather than adjudicated findings against Tether. The report itself says its methodology relied heavily on sanctions and seizure designations from U.S. and Israeli authorities and notes that blockchain wallet ownership is pseudonymous.
Tether disputed the broader characterization through its September statement, emphasizing its cooperation with U.S. and international authorities. CEO Paolo Ardoino said Tether can act when credible information is supplied by law enforcement.
The Senate report also says Tether had not responded to a June 2026 request for information by the time the report was published.
Why the Freeze Mechanism Matters For Stablecoins
The Iran actions illustrate a structural feature that distinguishes centralized stablecoins from assets such as Bitcoin.
Chainalysis said this mechanism rendered the frozen balances inaccessible for spending or sending.
That capability creates a direct enforcement channel between blockchain intelligence, sanctions authorities and a private token issuer. U.S. Treasury’s Financial Crimes Enforcement Network separately warned in May that Iranian facilitators were likely to use stablecoins because of their liquidity, settlement characteristics and relative price stability.
The same mechanism also creates compliance questions. If a sanctioned wallet is identified only after funds have moved elsewhere, an issuer-level freeze may stop the remaining balance but cannot necessarily reverse transfers that already occurred.
Tether’s September statement, by contrast, presents its recent Iran-related actions as evidence of active cooperation with law enforcement.
What Happens Next
The immediate issue for editors and market participants is the reconciliation of Tether’s approximately $550 million figure.
OFAC’s sanctions records establish the relevant Iran-linked wallet designations, while Chainalysis independently documented approximately $131 million frozen in July and nearly $475 million cumulatively after the July action. Tether’s September disclosure expands that figure to approximately $550 million but does not identify the additional wallets or cases.
The Senate investigation could also lead to further scrutiny from the U.S. Treasury Department and Department of Justice. Senator Richard Blumenthal referred the report’s findings to both agencies and requested investigations into Tether’s sanctions and anti-money-laundering practices.
For the crypto industry, the broader issue is the growing role of stablecoin issuers in sanctions enforcement. The Iran case demonstrates both sides of that model: public blockchains can provide transaction visibility, while centralized stablecoins can allow issuers to immobilize assets after authorities identify targeted wallets.
