Can Crypto Be Frozen or Seized?

Two questions get asked as if they were one, and they have opposite answers. Can somebody stop your crypto from moving, and can somebody take it from you? The first depends almost entirely on which coin you hold, and the second depends on whether anyone can get at your keys.

The distinction matters more than it sounds, because it decides which of your holdings are genuinely outside anyone's reach and which only feel that way. Educational guide, not financial advice.

Freezing: a feature, not a hack

Most dollar stablecoins ship with a function that lets the issuer render tokens at a given address unusable. The coins stay visible on the blockchain, they just stop being movable, and no court has to physically take anything for that to happen.

This is designed in on purpose. An issuer that promises to redeem tokens for real dollars is a regulated business with obligations, and a business with obligations needs a way to comply with them. The freeze switch is what compliance looks like when the asset is a token.

The scale is larger than most holders realise. By early 2026 Tether had blacklisted close to 10,000 addresses holding more than 5 billion dollars between them. Circle, which issues USDC, had frozen roughly 370 addresses holding around 109 million. Those are not equivalent policies, and the gap is mostly about how proactively each issuer acts rather than about how much either can do.

The episode that showed the difference

In August 2022 the US Treasury sanctioned Tornado Cash, adding 45 Ethereum addresses to its list. Circle acted immediately, blacklisting more than 35 addresses and freezing about 70,000 dollars of USDC within days.

Tether declined, arguing that it had received no instruction requiring a stablecoin issuer to freeze secondary-market addresses, and that acting without one was premature. Both companies held the same technical power. They read their obligations differently, and for a while that difference was the only thing standing between certain users and a frozen balance.

The story then turned again twice. Tether adopted a proactive policy by late 2023, freezing new addresses as they were sanctioned rather than waiting to be told. Then a court found in November 2024 that the Treasury had exceeded its authority, and the Tornado Cash sanctions were lifted in March 2025.

The lesson is not that any party behaved badly. It is that with a stablecoin, someone always has the switch, and their reading of the rules can change faster than yours can.

Bitcoin: no switch, which is not the same as untouchable

Bitcoin has no issuer and no freeze function. Nobody can flip anything to make your coins stop working, and this is a genuine and often-misunderstood property of the design.

What can still happen is seizure, which works by getting the keys rather than by disabling the coins. In February 2022 the US Department of Justice seized more than 94,000 bitcoin connected to the 2016 Bitfinex hack, worth about 3.6 billion dollars at the time and described as the largest financial seizure in the department's history. Ilya Lichtenstein and Heather Morgan were arrested, and investigators obtained the private keys from online accounts they controlled.

Note how ordinary that is as police work. There was no cryptographic break and no override built into bitcoin. Somebody kept the keys somewhere reachable, and a warrant reached it.

Where your coins actually sit

Three situations, with quite different exposure, and most people are in more than one of them at once.

• On an exchange or with a provider. The platform holds the keys, so it can and sometimes must restrict an account. This is normal financial regulation applied to crypto, not something peculiar to the technology.

• In your own wallet, holding stablecoins. No intermediary controls the account, and the issuer can still freeze the tokens. Self-custody protects you from the platform, not from the token's own rules.

• In your own wallet, holding bitcoin or ether. No freeze exists. What remains is whether anyone can reach the keys, which makes this a question about where your backup lives rather than about the blockchain at all.

What follows from all this

None of it is a reason for panic, and most holders will never encounter any of it. It is a reason to know which category your holdings fall into before you assume a property they may not have.

If the reason you hold a dollar stablecoin is that you distrust intermediaries, notice that you have chosen an asset whose issuer keeps a switch. That may still be the right trade for the liquidity and the stability, and plenty of people make it knowingly. Making it unknowingly is the part worth avoiding.

Keep records of what you hold and where, as ordinary practice. If an account is ever restricted while a case is looked at, the people who can produce a clean history of how funds arrived tend to get through the process considerably faster than the people who cannot.