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With a market capitalization of around $186 billion, USDT has become the digital dollar for millions of people worldwide. However, few realize that the token's issuer can freeze funds at a specific address at any time — and regularly exercises this right.

The Freeze Mechanism: How Tether Controls USDT

In the last six months alone, Tether has blacklisted 2,362 addresses on the Ethereum and TRON networks, blocking $1.64 billion on them. Such decisions usually target hackers and scammers, but the very possibility of a freeze means that even on a non-custodial wallet, the holder does not fully control the tokens.

Together with the team behind the Bitcoin mixer Mixer.Money, we examine how the USDT freeze mechanism works, why ordinary users sometimes get caught in it, and why holding funds in stablecoins is riskier than holding Bitcoin.

The Ardoino List

USDT is a centralized stablecoin, and Tether does not hide this. Company CEO Paolo Ardoino emphasizes this feature of the token and often contrasts it with Bitcoin as an alternative.

The ability to block an address and forcibly destroy tokens is embedded in Tether's smart contracts on Ethereum (ERC-20), TRON (TRC-20), Solana, and other networks. The function names may differ, but the principle is the same:

• Adding to the blacklist (addBlackList) — the address owner loses the ability to send USDT; any transfer is rejected at the contract level. The address itself remains active: it can receive new USDT and freely manage the network's native coin, such as ETH, TRX, or SOL;
• Removal from the blacklist (removeBlackList) — restores the ability to transfer tokens;
• Destruction of funds (destroyBlackFunds) — irreversibly burns USDT at the blocked address. The owner will no longer be able to recover them.

After burning, Tether can issue an equivalent volume of tokens at another address. Re-issuance is used when funds are returned to victims or transferred to wallets under law enforcement control. In other words, the issuer can take dollars from one address and re-issue them in favor of another.

Promissory Note vs. Digital Gold

Behind every freeze is an external request. According to BlockSec, Tether freezes an address based on a single verified law enforcement request — without warning the holder or providing an appeal procedure before the freeze. The user learns about the restriction only after the freeze occurs. The T3 Financial Crime Unit (T3 FCU) — a joint project of Tether, TRON, and the analytics company TRM Labs — carries out the freeze within 24 hours. Since its creation in September 2024, the alliance had frozen over $450 million across 23 jurisdictions by May 2026.

The stablecoins themselves are identified for freezing by on-chain analytics companies like Chainalysis, Elliptic, and TRM Labs. They assign risk levels to wallets and link them together. If an address receives a high risk score, AML systems also raise the assessment for wallets connected to it. Sometimes, random users whose coins once passed through a recognized "dirty" address end up under restrictions.

Analysts also track Bitcoin, but it is impossible to take it from the owner without the private keys. USDT and USDC are debt obligations of a centralized issuer. It retains control at the contract level: blocking transfers, burning balances, and re-issuing amounts. The holder manages the private keys, but not the token's rules.

Bitcoin has no administrator, no blacklist function, and no "big red button" called destroyBlackFunds. There is simply no one to execute such a request.

The Tether Panopticon

The freeze function helps investigate crimes and return funds to scam victims. During its operation, T3 FCU has been involved in cases related to money laundering, drug trafficking, terrorist financing, and the activities of North Korean hacker groups. The FATF has called the unit an "invaluable resource for law enforcement agencies worldwide." Such activities contribute to growing regulatory trust in the crypto industry as a whole.

But this system also has a downside. USDT remains a centralized asset, and access to funds ultimately depends on decisions by the issuer and requests from authorities. In essence, the stablecoin has become a node in a global surveillance system: a private company, connected to hundreds of agencies and analytics services, capable of freezing "digital dollars" almost anywhere in the world.

In this sense, the USDT ecosystem resembles a digital panopticon: most users never directly encounter restrictions, but they know such a possibility exists. The effectiveness of this mechanism strengthens regulatory trust, but at the same time, it continues to blur the boundaries of financial autonomy, which are already narrowing as cash is gradually phased out.

Expert opinion: Diversifying among major stablecoins merely spreads the dependence across different companies, but the freeze architecture itself remains. Bitcoin protects against arbitrary fund freezes but does not hide financial activity from prying eyes. Privacy-enhancing solutions like Mixer.Money help reduce the digital footprint.