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With a market capitalization of approximately $186 billion, USDT has become the digital dollar for millions of users worldwide. However, few consider that the token's issuer can freeze funds at a specific address at any time — and regularly does so.

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. Let's explore 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.

Ardoino's List

USDT is a centralized stablecoin, and Tether does not hide this fact. 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 functions vary, 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.
• 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. Reissuance 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 reissue them in favor of another," experts note.

Promissory Note vs. Digital Gold

Behind every freeze is an external request. Tether freezes an address based on a single verified request from law enforcement — without warning to the holder or an appeal process before the freeze. The T3 Financial Crime Unit (T3 FCU) — a joint project of Tether, TRON, and analytics company TRM Labs — executes the freeze within 24 hours. Created in September 2024, the alliance had frozen over $450 million across 23 jurisdictions by May 2026.

Stablecoins for freezing are identified 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 cannot be taken from its owner without private keys. USDT and USDC are debt obligations of a centralized issuer. The issuer retains control at the contract level: blocking transfers, burning balances, and reissuing amounts. The holder controls the private keys but not the token's rules. Bitcoin has no administrator, no blacklist function, and no "big red button" like destroyBlackFunds. There is simply no one to execute such a request.

Privacy After Conversion

Converting USDT to bitcoin removes the risk of a freeze at the issuer level. But it does not eliminate on-chain surveillance: the first cryptocurrency is not anonymous, but pseudonymous. Additional tools are required to hide the link between addresses. There are several ways to break the on-chain trail, each with its own limitations:

• CoinJoin — joint mixing of coins from multiple users in a single transaction. This mechanism is usually recognized by analytics systems, so the mere use of CoinJoin can increase an address's risk score.
• Centralized mixers — they do not combine users in a common transaction but receive funds into their own pool and then send other coins. This breaks the direct on-chain link between input and output but requires trust in the service operator.
• Bitcoin mixers using verified coins — they do not mix user funds with each other and do not use their own liquidity pool. Instead, they utilize verified clean coins from trusted investors, allowing them to break the direct on-chain link between incoming and outgoing transactions.

Panopticon Tether

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 activities of North Korean hacker groups. 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 the issuer's decisions 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, can freeze "digital dollars" almost anywhere in the world. In this sense, the USDT ecosystem resembles a digital panopticon: most users never directly encounter restrictions but know that such a possibility exists.

"Diversification" among major stablecoins only dilutes dependence on one company, but the freeze architecture itself remains. Bitcoin has neither an administrator nor a single control center, so there is simply no one to execute a request to freeze funds at the protocol level. This makes it the only major digital asset that does not depend on decisions by an issuer, regulator, or bank. The first cryptocurrency cannot be frozen, seized, or burned by a third party's decision, and its issuance rules remain unchanged regardless of state inflation policies and legislative changes.

My expert opinion: The stablecoin market undoubtedly plays a key role in liquidity and cryptocurrency adoption, but the price is complete dependence on a centralized issuer. For those who value true financial autonomy and are unwilling to accept the risk of arbitrary freezing, bitcoin remains the only truly decentralized asset. However, it is worth remembering that even bitcoin does not guarantee privacy without additional tools.