Author: Shenchao TechFlow
On October 20, 2026, Tether CEO Paolo Ardoino posted on a social platform, publicly responding to the sanctions compliance investigation report previously released by the U.S. Senate Permanent Subcommittee on Investigations.
Ardoino disclosed that since 2023, Tether has frozen addresses involved in cases an entire four weeks earlier than formal sanctions by regulators such as the U.S. Office of Foreign Assets Control (OFAC), and earlier than official markings by blockchain analysis firm Chainalysis in 99% of cases.
On-chain enforcement delays and the cutoff of transactions involving Iran have reduced volumes by over 90%.
In this public dispute over sanctions compliance, Tether chose to use its pre-risk control data directly as a defense. Ardoino noted that, thanks to proactive collaboration channels established with global law enforcement agencies, the company demonstrates significant agility in identifying emerging threats.
According to officially disclosed actual results, Tether's targeted blocking measures have directly caused a 94% drop in on-chain stablecoin transactions linked to Iran, effectively severing the on-chain funding circulation chains of restricted entities.
Senate investigation pressures and $550 million freeze list
The catalyst for this public response was an investigative report led by U.S. Senator Richard Blumenthal, which found that 84% of transactions among 846 Iranian-linked wallets designated as sanctioned or seized by authorities primarily relied on USDT.
The investigation report closely tracked on-chain violations involving forced liquidations in recent years, accusing illicit networks of using highly liquid stablecoins to circumvent traditional banking SWIFT reviews, and further criticizing issuers for failing to adequately fulfill blacklist screening responsibilities.
The report calls on the U.S. Department of Justice and the Treasury to initiate a comprehensive anti-money laundering investigation. However, Tether’s subsequent release of a coordinated list shows that since 2026, the team has assisted law enforcement agencies in multiple countries in freezing approximately $550 million in assets linked to Iran, with many seized wallets directly tied to network evasion.
Offshore stablecoins: From passive compliance to on-chain enforcement frontlines
This dispute clearly reveals the evolving regulatory role of offshore stablecoin issuers—from initially passively responding to judicial inquiries, to now proactively implementing technical cutoffs a month before official sanctions are issued, issuers have gradually transformed into de facto on-chain enforcement frontlines.
As traditional intelligence markers lag behind high-frequency on-chain money laundering pathways, giants with centralized smart contract blacklist control are attempting to seize the definition of compliance by building their own intelligence networks, intensifying the battle over the legal jurisdiction and boundaries of stablecoins.
Faced with increasingly stringent穿透式 regulation from Washington’s political and judicial authorities, leading issuers must seek a more technically robust dynamic balance between preserving global free liquidity and avoiding secondary sanctions risk.