Tether, the major stablecoin issuer at the center of recent regulatory discussions, has frozen more than $514 million worth of USDT linked to illicit activities across the Tron and Ethereum blockchains within the last 30 days. Data from BlockSec’s USDT Freeze Tracker highlights that the vast majority of these frozen funds were on the Tron network, underscoring growing surveillance and intervention in stablecoin circulation.
Breakdown of frozen USDT and network distribution
Analysis shows a total of 370 addresses were blacklisted during this crackdown: 328 on Tron and 42 on Ethereum. Of the total funds frozen, roughly $505.9 million was locked on Tron-based addresses, while $8.73 million was restricted on Ethereum. Throughout 2025, Tether seized a total of $1.26 billion in USDT across both blockchains, blacklisting 4,163 unique addresses according to BlockSec reports.
Historical trends and ramped-up enforcement
Tether’s oversight and freezing operations have intensified in recent years. In 2025 alone, more than half of the frozen USDT—an estimated $698 million—was permanently removed from circulation using the company’s “destroyBlackFunds” smart contract function. Meanwhile, only about 3.6% of addresses blacklisted during this period were eventually removed from the blacklist. Between 2023 and 2025, independent studies indicate Tether froze around $3.3 billion across more than 7,200 addresses, sharply outpacing enforcement activity by competing stablecoin issuer Circle.
Regulatory action, financial crime, and collaborations
Over the past few years, Tether has conducted numerous operations targeting wallets tied to cybercrime, fraud schemes, and violations of international sanctions. Since 2023, such measures have been stepped up in response to mounting regulatory and legal pressures on the digital asset sector. Public disclosures from February 2024 stated that Tether had blocked $4.2 billion in suspicious tokens over three years.
In April, Tether announced it had collaborated with the US Treasury Department’s Office of Foreign Assets Control and law enforcement agencies, freezing over $344 million USDT held in two Tron addresses linked to sanctions evasion involving Iran. Previously, in February, over $61 million in USDT was seized as part of a joint effort to disrupt crypto scams known as “pig butchering.”
Tether maintains a leading role in applying industry controls in partnership with authorities in charge of global regulations and sanctions. If the current pace continues, the amount of USDT frozen is projected to exceed 2025 levels before the close of 2026.
Over the last 30 days alone, Tether has frozen a total of more than $514 million USDT across the Ethereum and Tron blockchains due to suspected illicit transactions. Most of the blocked funds were on Tron, and 370 addresses were blacklisted during this period.
These ongoing initiatives underscore the increasing pressure on stablecoin issuers to exercise greater oversight and proactively address concerns around crypto-related crime. The scale of Tether’s recent enforcement stands in sharp contrast with the more limited interventions of other competitors.
Observers note that such measures can have significant impacts on the broader cryptocurrency ecosystem, influencing both user trust and regulatory compliance trends. While freezing funds is seen as a protective measure, it also raises questions about decentralization and control in digital finance.
The data comes as part of a broader industry response to combat financial wrongdoing involving stablecoins, highlighting cooperation between private sector actors and international enforcement bodies. This trend is expected to continue as oversight frameworks evolve globally.
Stablecoins like USDT are frequently targeted by criminal groups due to their liquidity and cross-border utility, making ongoing monitoring and freezing operations a crucial part of industry best practices.
Looking ahead, analysts predict enhanced compliance, technological upgrades for real-time monitoring, and closer ties between crypto companies and regulatory agencies. Tether’s recent actions may set a policy precedent as other issuers face similar scrutiny.
