SKN | Tether Faces $42.4 Million USDT Lawsuit Over Alleged Unlawful Wallet Freeze

Key Points:

• Two Thai businessmen have sued Tether, alleging the stablecoin issuer froze approximately $42.4 million in USDT without a warrant, court order or direct legal process.
• The dispute involves 42.4 million USDT across 10 Ethereum addresses, which were allegedly blacklisted in October 2025 before a federal seizure warrant was issued in February 2026.
• The case highlights a broader tension between stablecoin compliance powers, law-enforcement cooperation and user property rights as regulators increasingly scrutinize digital-asset infrastructure.

Tether is facing a new legal challenge over its authority to freeze USDT, with two Thai businessmen alleging that approximately $42.4 million of their stablecoin holdings were immobilized without sufficient legal authority. The lawsuit arrives as stablecoin issuers face growing pressure to cooperate with law enforcement while institutional investors simultaneously demand clearer rules governing ownership, custody and transfer restrictions.

Dispute Centers on a Freeze Before a Seizure Warrant

Nutthawat Rukthammachalern and Natthawat Kasamvilas filed the complaint in the U.S. District Court for the Southern District of New York. According to the filing, Tether blacklisted 10 Ethereum addresses on October 30, 2025, containing approximately 42,417,785.62 USDT.

The plaintiffs claim the addresses were frozen following an informal request from a Homeland Security Investigations agent, without a warrant or court order directed at Tether. They argue that the subsequent seizure warrant, issued by a federal magistrate judge in North Carolina on February 19, 2026, did not retroactively authorize the earlier freeze.

The warrant reportedly contemplated Tether burning the restricted USDT, minting replacement tokens and transferring them to a government-controlled wallet. The plaintiffs dispute whether those actions can occur before a final forfeiture judgment.

Tether’s Smart-Contract Powers Are Central to the Case

The lawsuit puts an unusual focus on an important technical feature of centralized stablecoins. Tether maintains administrative functions within USDT’s smart contracts that allow it to blacklist specific cryptocurrency addresses across supported networks, including Ethereum.

When an address is blacklisted, the affected tokens remain visible on the blockchain but cannot be transferred. Tether can also burn USDT associated with restricted addresses. This creates a fundamental distinction between blockchain ownership as recorded on-chain and the practical ability to move or redeem the underlying stablecoin.

For institutional participants, that distinction is increasingly relevant. Unlike decentralized cryptocurrencies where transaction validation generally does not depend on an issuer’s permission, centralized stablecoins incorporate compliance mechanisms that can interrupt transfers under specified circumstances.

Tether Defends Its Law-Enforcement Cooperation

Tether has rejected the lawsuit’s characterization of its conduct, calling the case a “baseless attempt” to interfere with its cooperation with global law enforcement. The company has increasingly emphasized its compliance infrastructure as regulators and governments intensify efforts to combat sanctions evasion, fraud and illicit finance involving digital assets.

In April, Tether said it worked with more than 340 law-enforcement agencies across 65 countries and had helped freeze more than $4.4 billion in assets connected to suspected unlawful activity. The company has argued that rapid intervention can prevent illicit funds from being moved beyond authorities’ reach.

Legal Outcome Could Have Broader Stablecoin Implications

The case ultimately raises questions extending beyond the disputed $42.4 million. If courts establish clearer limits on when an issuer can freeze tokens following an informal government request, the ruling could influence stablecoin compliance procedures, institutional custody arrangements and secondary-market transactions.

The plaintiffs also say they obtained the USDT through secondary-market business transactions and never opened Tether accounts or purchased tokens directly from the issuer. The court’s treatment of those claims could therefore be significant for participants who acquire stablecoins indirectly.

For crypto investors and institutions, the next developments will center on the court’s handling of the alleged pre-warrant freeze and the legal basis for subsequent token destruction and replacement. The dispute underscores that stablecoin liquidity depends not only on blockchain infrastructure, but also on the legal and administrative framework controlling who can ultimately move those tokens.