Tether’s Expanding Role in Global Enforcement as Turkey Freezes Over Half a Billion in Crypto Assets

Tether has taken a central role in one of Turkey’s largest cryptocurrency enforcement actions to date, underscoring how stablecoin issuers are increasingly embedded in global efforts to police illicit financial activity. At the request of Turkish authorities, the company froze more than $540 million in digital assets linked to an alleged illegal online betting and money-laundering network, a move that places private crypto firms squarely alongside traditional law enforcement.

The action followed an announcement by prosecutors in Istanbul, who said they had seized approximately €460 million in assets connected to Veysel Sahin, a figure accused of operating unlawful betting platforms and funneling proceeds through complex payment networks. While officials initially withheld the identity of the crypto company involved, Tether later confirmed it had executed the freeze. Chief executive Paolo Ardoino explained that the firm acted after reviewing information provided by authorities, describing the process as consistent with its cooperation with agencies such as the U.S. Department of Justice and the FBI.

The seizure forms part of a broader crackdown on underground gambling in Turkey, where authorities say related investigations have already resulted in the confiscation of more than $1 billion in assets. The scale of the operation reflects growing concern among governments that digital assets, particularly stablecoins, have become a preferred conduit for cross-border money laundering due to their liquidity and price stability.

Tether has increasingly emphasized its compliance efforts as scrutiny of the stablecoin sector intensifies. According to the company, it has assisted law enforcement in more than 1,800 cases across 62 countries, freezing a total of $3.4 billion in USDT tied to suspected criminal activity. Blockchain analytics firm Elliptic estimates that by late 2025, stablecoin issuers, led by Tether and Circle, had blacklisted roughly 5,700 wallets holding around $2.5 billion. Nearly three-quarters of those addresses contained USDT at the time they were frozen.

Despite this cooperation, USDT remains at the center of regulatory and academic debate. U.S. prosecutors recently charged a Venezuelan national with laundering $1 billion, largely through transactions involving the token, while blockchain researchers have repeatedly linked large USDT flows to sanctions-evasion schemes. Separate data from Bitrace suggests that more than $649 billion in stablecoin transactions passed through high-risk blockchain addresses in 2024, with Tron-based USDT accounting for over 70% of that volume.

These concerns coexist with USDT’s continued expansion. In the final quarter of 2025, the token’s market capitalization climbed to a record $187.3 billion, adding more than $12 billion even as the broader crypto market struggled following October’s liquidation-driven downturn. Competitors fared less well, with Circle’s USDC largely flat and Ethena’s USDe losing more than half its value during the same period.

Usage metrics tell a similar story. Monthly active USDT wallets reached nearly 25 million, representing about 70% of all stablecoin-holding addresses, while quarterly transfer volume surged to $4.4 trillion across more than two billion transactions. These figures highlight a paradox that regulators are still grappling with: USDT has become both a backbone of global crypto liquidity and a persistent point of concern for financial crime enforcement.

The Turkish seizure illustrates how that tension is increasingly being managed through cooperation rather than confrontation. As stablecoins continue to scale globally, their issuers are no longer peripheral actors. They are becoming de facto gatekeepers, shaping how digital finance intersects with national legal systems.