The Digital Dollar Under Surveillance: Why USDT Is Not a Cryptocurrency, but a Tool of Oversight
With a market capitalization exceeding $186 billion, USDT has firmly established itself as the "digital dollar" for tens of millions of users worldwide. However, beneath this external stability lies a fundamental feature: Tether is not just an issuer, but a controlling body capable of blocking and seizing funds from any address at any time. Over the past six months, the company has blacklisted 2,362 addresses on the Ethereum and TRON networks, freezing $1.64 billion on them. Formally, this is a fight against hackers and fraudsters, but the reality is that even on a non-custodial wallet, you are not the full owner of your tokens.
The Mechanics of Freezing: From List to Burn
The blocking mechanism is embedded in Tether's smart contracts. The process involves three stages: adding an address to the blacklist (addBlackList) — blocking the ability to send USDT; removing from the list (removeBlackList) — restoring functionality; and finally, destroying funds (destroyBlackFunds) — the irreversible burning of tokens at the blocked address. After this, Tether can reissue an equivalent volume at another address, for example, to return funds to victims or transfer them to law enforcement. Essentially, the issuer can take dollars from one address and reissue them in favor of another. On average, it takes about two days between a blocking order and its execution on the network.
Promissory Note vs. Digital Gold
Each blocking is initiated by an external request — from law enforcement agencies. Tether acts without warning or an appeals process. The joint project T3 Financial Crime Unit (T3 FCU) with TRON and TRM Labs, launched in September 2024, has already frozen over $450 million across 23 jurisdictions. At the same time, random users whose coins once passed through a "dirty" address may also be subject to blocking. Analytical companies like Chainalysis and TRM Labs assign risk scores to wallets, and if an address receives a high risk score, it raises the assessment for all wallets connected to it.
This is the key difference between USDT and Bitcoin. USDT is a debt obligation of a centralized issuer that retains control at the contract level. Bitcoin has no administrator, no blacklist function, and no "big red button." There is simply no one to execute such a request. The risk of blocking does not disappear but shifts to the level of exchanges and exchangers, where users are required to provide documents.
Privacy After Conversion
Converting USDT to Bitcoin removes the risk of freezing at the issuer level but does not eliminate on-chain surveillance. The first cryptocurrency is not anonymous, but pseudonymous. Additional tools are required to hide the link between addresses. CoinJoin, for example, is easily identified by analytical systems and itself increases the risk score. Centralized mixers require trust in the operator. An alternative is Bitcoin mixers on proven coins, such as Mixer.Money. Unlike CoinJoin, they do not mix users' funds together but use clean coins from trusted investors, breaking the direct on-chain link between incoming and outgoing transactions.
Panopticon Tether: The Other Side of the Coin
The freeze function undoubtedly helps in investigating crimes and returning funds to victims. The FATF calls T3 FCU an "invaluable resource for law enforcement agencies." This contributes to growing regulatory trust in the crypto industry. But this system has a downside. USDT has become a node in a global surveillance system: a private company, connected to hundreds of agencies, can freeze "digital dollars" almost anywhere in the world. This resembles a digital panopticon: most users never directly encounter restrictions but know that such a possibility exists. Diversifying between stablecoins only dilutes dependence on one company, but the architecture of freezing remains.
My analysis: Ultimately, only Bitcoin, which has no administrator or single center of control, remains the only major digital asset that does not depend on decisions by an issuer, regulator, or bank. It cannot be frozen, seized, or burned by a third party's decision. However, it does not conceal financial activity, and reducing the digital footprint requires solutions for enhancing privacy. The choice between a controlled stablecoin and a sovereign Bitcoin is, essentially, a choice between convenience and financial freedom.