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And why Bitcoin is the only real alternative

With a market capitalization of around $186 billion, USDT has become the digital dollar for millions of people worldwide. However, few realize: the issuer of this token can freeze funds at a specific address at any time — and regularly exercises this right. In the last six months alone, Tether has added 2,362 addresses to its blacklist 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 explore how the USDT freeze mechanism works, why ordinary users sometimes get caught up in it, and why storing funds in stablecoins is riskier than storing Bitcoin.

Ardoino's List

USDT is a centralized stablecoin, and Tether does not hide this. Company CEO Paolo Ardoino emphasizes this feature of the token (unlike some supposedly decentralized projects) 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:

• 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 use the network's native coin like ETH, TRX, or SOL;
• removeBlackList — restores the ability to transfer tokens;
• destroyBlackFunds — irreversibly burns USDT at the blocked address. The owner can no longer recover them.

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

According to BlockSec, it takes an average of about two days between issuing a freeze order and its execution on the network. The status of an address on the Ethereum and TRON networks can be checked using the company's checker.

Promissory Note vs. Digital Gold

Each freeze stems from 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 firm TRM Labs — executes the freeze within 24 hours. Since its creation in September 2024, the alliance had frozen over $450 million across 23 jurisdictions by May 2026.

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 raise the assessment for related wallets as well. Sometimes, random users whose coins once passed through a deemed "dirty" address end up under restrictions.

Analysts also track Bitcoin, but taking it from its owner without private keys is impossible. USDT and USDC are debt obligations of a centralized issuer. The issuer retains control at the contract level: blocking transfers, burning balances, and re-issuing 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. However, the risk of freezing does not disappear entirely. It shifts from the protocol level to the level of exchanges, exchangers, and other centralized services — where users have their documents checked and accounts can be frozen.

Attempts to impose censorship within the Bitcoin network itself have already been made. In 2021, the mining company MARA launched the first OFAC-compliant pool in North America, which filtered transactions based on sanctions lists. The community saw this as a threat of censorship at the block production level and sharply criticized the initiative. Two months after the announcement, MARA ended the experiment. Converting USDT to Bitcoin removes the risk of freezing at the issuer level. But it does not eliminate on-chain surveillance: contrary to common stereotypes, the first cryptocurrency is not anonymous, but pseudonymous.

Privacy After Conversion

To hide the link between addresses, additional tools are required. 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 single 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 together and do not use their own liquidity pool. Instead, they use verified clean coins from trusted investors, breaking the direct on-chain link between incoming and outgoing transactions.

Mixer.Money falls into the last category. Unlike CoinJoin, it does not mix funds from different participants. The bitcoin.mixer 2.0 algorithm uses verified clean Bitcoins from trusted investors, breaking the direct link between incoming and outgoing transactions. In "Full Anonymity" mode, coins are split into random parts in a premixer and sent to independent investors. After a random interval, which protects against timestamp analysis, the sender receives an equivalent amount minus the fee. The funds arrive at two new addresses not linked on-chain to the original wallet. As Mixer.Money emphasizes: "CoinJoin is easily identified on-chain and itself increases the risk score. Many exchanges and exchangers warn about account blocking for using such services."

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 the activities of North Korean hacker groups. FATF has called the unit an "invaluable resource for law enforcement 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 government requests. Essentially, 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. The effectiveness of this mechanism strengthens regulatory trust but simultaneously continues to blur the boundaries of financial autonomy, already narrowing as cash is gradually phased out. "Diversification" among major stablecoins only spreads the dependence across one company, but the freeze architecture itself remains.

Bitcoin has no administrator or 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. Bitcoin protects against arbitrary fund freezes but does not hide financial activity from prying eyes. All transactions are recorded in a public ledger and can be analyzed years after they are made. Privacy-enhancing solutions like Mixer.Money help reduce the digital footprint.

My expert conclusion: In a world where centralized stablecoins are becoming tools of global surveillance, Bitcoin remains the only asset that cannot be blocked or confiscated by a third party's decision. However, its pseudonymity requires additional measures to protect privacy. Using high-quality mixers is not a luxury but a necessity for those who value their financial freedom.