Tether Operations Ltd. has frozen $213 million in USDT held across 48 wallets connected to Gurhan Kiziloz, founder of a prominent iGaming and technology group, acting at the direction of Brazilian authorities conducting a sweeping inquiry into an alleged gambling tax shortfall and a series of token sales the country now considers unregistered.
The freeze ranks among the largest single-target enforcement actions Tether has executed. It sits at the intersection of two regulatory questions Brazil has been preparing to push: how to tax gambling activity that took place before the country established a licensing regime, and how to treat token issuance that pre-dated a coherent securities posture. Both questions converge on the period between 2021 and 2024. Both now rest, for the moment, on the assets sitting inactive in 48 frozen wallets.
No criminal charges have been filed. The matter is proceeding through Brazil’s civil courts. Kiziloz could not be reached for comment.
What makes the action distinctive is not its size but its precision. A 48-wallet freeze tied to a single tax dispute does not happen quickly. Tax investigators had to identify, map, and verify each account individually, anchoring every wallet to the disputed period before Tether could move. The exercise demands the kind of granular on-chain analysis and sustained cross-border cooperation that takes months, not days, to assemble. By the time the freeze landed, the case behind it had been under construction for some time.
The episode also marks a shift in how the stablecoin industry positions itself. Tether has now frozen more than $5.1 billion in USDT since inception, according to on-chain analysis, including over $500 million in the past 30 days alone.
With circulating supply approaching $190 billion and USDT functioning as the primary liquidity instrument across the cryptocurrency market, the firm’s freeze mechanism has become one of the most consequential enforcement tools in digital finance. When Tether acts, liquidity disappears in minutes, not after weeks of court motions and bank wire reversals.
Kiziloz’s legal team is expected to challenge the action on constitutional grounds, drawing on Brazilian protections against the retrospective imposition of fiscal obligations. The substance of that challenge will now be tested in court.
Whatever the outcome, the wider cohort of operators and issuers active in Brazil during the same window has been put on notice.