When most people think of stablecoin freezes, they think of Tether. We have written separately about the Tether USDT blacklist and how to request removal. But Tether is only one of several stablecoin issuers with the ability to freeze addresses. Circle (USDC), First Digital (FDUSD), Paxos (PYUSD), and even MakerDAO (DAI) all have mechanisms to restrict or freeze addresses. Each works differently, each has a different appeals process, and each carries different risks for users.

In this guide, I break down each major stablecoin issuer's freeze mechanism — how it works technically, why addresses get frozen, and what you can do if your address is on the blacklist. If you hold stablecoins, you need to understand these risks. If your stablecoins have already been frozen, this guide explains the appeal process for each issuer.

Why stablecoin issuers can freeze addresses

Stablecoins are fundamentally different from Bitcoin or Ethereum. Bitcoin has no central issuer — no one can freeze a Bitcoin address. But stablecoins are issued by a central entity that is legally responsible for maintaining the token's peg and complying with regulations. That entity has the technical capability — and the legal obligation — to freeze addresses that are associated with illicit activity.

This capability is built into the stablecoin's smart contract at the code level. When a stablecoin is deployed on a blockchain, the smart contract includes an admin function that allows the issuer to add addresses to a blacklist. Once an address is blacklisted, the smart contract prevents that address from sending or receiving the token. The tokens are still in the wallet — they are visible on the blockchain — but they cannot be moved.

Every major centralized stablecoin has this function. It is not a secret — it is disclosed in the token's terms of service and technical documentation. But most users do not read the terms of service, and many are surprised when their stablecoins are suddenly frozen. The decentralized stablecoins (like DAI) have a different approach, but they are not entirely immune to freezing either, as I explain below.

Circle (USDC): the most transparent freeze process

Circle issues USDC, the second-largest stablecoin by market capitalization. USDC is deployed on Ethereum, Solana, Avalanche, Polygon, Arbitrum, Optimism, Base, and several other chains. Circle's freeze mechanism works similarly to Tether's — the USDC smart contract includes a blacklist function that allows Circle to add addresses to a blocked list.

What makes USDC different from USDT is Circle's relative transparency. Circle is a US-registered company (formerly Circle Internet Financial, now a public entity). It is regulated as a money transmitter in most US states and operates under a BitLicense in New York. This regulatory status means Circle follows formal compliance procedures — and it means Circle has a more structured appeals process than Tether.

How Circle freezes addresses

Circle freezes addresses based on three primary triggers:

When Circle freezes an address, it freezes it across all chains where USDC operates. If your address is frozen on Ethereum, it is also frozen for USDC on Solana, Avalanche, Polygon, and every other chain. This is different from how some smaller issuers handle it — Circle maintains a unified blacklist across all chains.

How to appeal a USDC freeze

Circle has a more structured appeals process than Tether. You can contact Circle's compliance team through their official website or through legal counsel. The appeal process involves:

In our experience, Circle is more responsive to well-prepared legal requests than Tether. Circle typically responds within 7-14 business days of receiving a complete appeal. If the appeal is successful, Circle unfreezes the address — but the process can take an additional 2-3 weeks for the unfreeze to propagate across all chains.

The success rate for USDC unfreeze requests is higher than for USDT, in our experience. Circle is a US-regulated entity, which means it operates under due process requirements that Tether (registered in the BVI) does not have. If Circle refuses to unfreeze an address despite compelling evidence, the option of filing a complaint with the New York Department of Financial Services (NYDFS) or the relevant state money transmitter regulator is a meaningful lever that does not exist with Tether.

First Digital (FDUSD): the new Binance-backed stablecoin

FDUSD is a relatively new stablecoin issued by First Digital Labs, a Hong Kong-based entity. It gained prominence after Binance stopped supporting BUSD (which was issued by Paxos under a NYDFS consent order) and promoted FDUSD as its preferred stablecoin. FDUSD is deployed on Ethereum and BNB Chain.

FDUSD's freeze mechanism is similar to USDC and USDT — the smart contract includes a blacklist function. However, First Digital's compliance team is smaller and less experienced than Circle's or Tether's. This means:

If your FDUSD is frozen, the best approach is to contact First Digital through legal counsel with a formal request that includes blockchain forensics demonstrating the legitimate origin of the funds. Because First Digital is Hong Kong-based, a Hong Kong court order can be obtained if the direct request is refused.

Paxos (PYUSD and BUSD): the PayPal stablecoin

Paxos Trust Company issues two stablecoins that are relevant to this discussion: PYUSD (PayPal USD) and the now-discontinued BUSD. Paxos is a New York trust company regulated by NYDFS, which means it operates under the strictest stablecoin regulatory framework in the United States.

PYUSD is the stablecoin issued in partnership with PayPal. It is deployed on Ethereum and Solana. The freeze mechanism is standard — the PYUSD smart contract includes a blacklist function that allows Paxos to freeze addresses. However, because Paxos is regulated by NYDFS, the freeze and unfreeze process is more formalized than most other issuers.

BUSD, which Paxos stopped minting in February 2023 under a NYDFS consent order, is still in circulation. Existing BUSD tokens remain functional and can still be frozen by Paxos. If you hold BUSD, the freeze risk is the same as with any other Paxos-issued stablecoin.

The appeals process for Paxos-issued stablecoins (PYUSD and BUSD) is the most formalized of any stablecoin issuer. Paxos has a published compliance process and is required by NYDFS to respond to unfreeze requests within a reasonable timeframe. In practice, Paxos typically responds within 10-15 business days. If the response is unsatisfactory, a complaint can be filed with NYDFS, which has the authority to order Paxos to unfreeze an address if the freeze was unjustified.

TrueUSD (TUSD): the opaque issuer

TUSD is issued by TrustToken, a US-based entity that later rebranded to Archblock. TUSD gained prominence when Binance promoted it as a replacement for BUSD. The freeze mechanism is standard — the smart contract includes a blacklist function.

What makes TUSD unique — and problematic — is its lack of transparency. Archblock does not publish information about its compliance process, does not have a published appeals procedure, and does not disclose the criteria for freezing addresses. In the cases we have handled involving TUSD, responses to legal requests have been inconsistent and slow (4-8 weeks).

If your TUSD is frozen, the best approach is through legal counsel with a formal demand letter. Because Archblock is a US entity, you have the option of filing a complaint with the relevant state financial regulator or pursuing civil litigation. However, TUSD's market share has been declining, and the practical risk of holding TUSD is decreasing as the token's liquidity diminishes.

DAI: the decentralized stablecoin that cannot be frozen — mostly

DAI is the largest decentralized stablecoin, issued by the MakerDAO protocol. Unlike USDT, USDC, FDUSD, and PYUSD, DAI does not have a central issuer that can freeze addresses. The DAI smart contract does not include a blacklist function. If you hold DAI in a self-custody wallet, no one can freeze it — not MakerDAO, not law enforcement, not anyone.

But this does not mean DAI is entirely immune to blocking. MakerDAO has the ability to block addresses from interacting with the Maker Protocol — specifically, from opening or managing Vault positions (the collateralized debt positions used to mint DAI). This means that while your DAI cannot be frozen in your wallet, you can be prevented from using it to generate more DAI or to interact with MakerDAO's other features.

The practical implication is this: if you hold DAI in a self-custody wallet, your funds are safe from freezing. But if you hold DAI on an exchange, the exchange can freeze your account — and the exchange's freeze is not a DAI-level freeze, it is an account-level freeze that prevents you from accessing all your funds on that exchange. See our guide to frozen exchange accounts for how to deal with this situation.

MakerDAO has used its address blocking capability sparingly. In 2022, MakerDAO blocked several addresses associated with the Tornado Cash sanctions. The decision was made through a governance vote — a unique feature of decentralized stablecoins. This means that even MakerDAO's limited blocking capability is subject to a democratic process, not a unilateral compliance decision.

Which stablecoins can be frozen, and which cannot?

Here is a practical summary:

The key takeaway: self-custody is the only way to truly protect your stablecoins from issuer-level freezing. If you hold USDT, USDC, FDUSD, or PYUSD in a self-custody wallet, the issuer can still freeze your address. But if you hold DAI, LUSD, or another decentralized stablecoin in a self-custody wallet, no one can freeze it.

False positives: when innocent addresses get frozen

The most common scenario I see in my practice is the false positive: an innocent user receives stablecoins from a tainted source and gets frozen. Here is a typical example:

You sell a car for USDC. The buyer sends you USDC from their wallet. A week later, your USDC is frozen. You discover that the buyer's wallet had previously received funds from a sanctioned address — not the buyer, but someone three transactions upstream. Circle's blockchain analytics flagged the buyer's wallet, and because you received USDC from that wallet, your address was flagged too.

This is the collateral damage of blockchain surveillance. The blockchain does not distinguish between the person who interacted with a sanctioned address and the person who received funds from them two transactions later. The analytics tools flag everyone in the chain.

In these cases, the appeal process is your only recourse. The key is to demonstrate that you are a legitimate user who received the funds through a legitimate transaction. This requires:

We handle these cases regularly. The success rate is high when the documentation is solid — most stablecoin issuers are willing to unfreeze addresses when presented with clear evidence that the frozen user is a victim of tainted funds, not a participant in illicit activity.

What to do if your stablecoins are frozen

If you discover that your stablecoins have been frozen, follow these steps:

Step 1: Determine which issuer froze you

Check the blockchain explorer for your address. If you hold USDT, check Etherscan or Tronscan for a "Frozen" flag. If you hold USDC, check Etherscan for the USDC token contract's blacklist. The explorer will show whether the address is blacklisted by the token contract.

Step 2: Try to determine the cause

Did you receive stablecoins from a known scammer? Did your funds pass through Tornado Cash or a mixer? Are you on an OFAC list? The cause determines the resolution strategy. If you received tainted funds unknowingly, you have a strong case. If your address is directly associated with illicit activity, the case is much harder.

Step 3: Submit a recovery request

Contact the issuer's compliance team. For USDC, use Circle's official website. For FDUSD, contact First Digital's compliance email. For PYUSD or BUSD, contact Paxos through their trust company portal. For USDT, see our Tether blacklist guide.

Include your identity documentation, the frozen address, a description of how you acquired the stablecoins, and supporting documentation. In our experience, direct requests from users have a moderate success rate — legal representation significantly improves both the speed and the likelihood of success.

Step 4: Legal escalation

If the direct request does not resolve the issue within 30 days, escalate through legal counsel. A formal letter from a law firm — particularly a Swiss or US law firm — signals that you are serious and creates a paper trail. For US-regulated issuers (Circle, Paxos), a complaint to the relevant state regulator (NYDFS for Paxos, state money transmitter regulators for Circle) is a powerful additional lever.

Most cases resolve within 4-8 weeks of legal submission. The issuers are generally responsive to well-prepared legal requests, particularly when the documentation demonstrates that the address owner is a legitimate user who received tainted funds unknowingly.

Protecting yourself from stablecoin freezes

If you use stablecoins regularly — for payments, trading, or holding — there are several strategies to reduce your freeze risk:

Case study: the USDC false positive cascade

In a recent case, a client operated a legitimate OTC desk in Dubai. A customer sent $48,000 in USDC to the client's wallet as part of a routine trade. The client's wallet was a multisig wallet that had been in use for two years without incident. Three days after receiving the USDC, the client's address was frozen by Circle.

The investigation revealed that the customer's wallet had received USDC from an address that was later flagged by Chainalysis as connected to a North Korean hacking group. The connection was indirect — four transactions removed from the customer's wallet — but Circle's risk model flagged every address in the chain, including our client's.

The client's OTC desk was licensed by VARA (Dubai's crypto regulator) and had its own AML procedures. The customer had passed KYC verification. The transaction had been screened by the client's own compliance tool (TRM Labs) before acceptance, with no flags. But Circle's blockchain analytics used a different risk model with a wider transaction radius — it flagged addresses up to five hops from a known illicit source, while TRM Labs only flagged up to three hops.

We filed a formal appeal with Circle's compliance team that included: (1) the client's VARA license, (2) the customer's KYC file, (3) the TRM Labs screening report showing no flags at the time of acceptance, (4) a blockchain forensics report tracing the USDC from the customer's wallet back to the legitimate source, and (5) a legal analysis demonstrating that the client had no knowledge of the funds' upstream history.

Circle responded within 11 business days. The address was unfrozen. The key to the successful outcome was the documentation — the client had a complete compliance file that demonstrated legitimate business operations. Without the VARA license and the TRM Labs screening report, the appeal would have been much harder. This case illustrates the importance of maintaining your own compliance records, even if you are an individual rather than a business.

The regulatory landscape: what is changing

The stablecoin freeze landscape is evolving rapidly. Several regulatory developments are changing how issuers handle freezes:

The trend is toward more freezing, not less. As regulators impose stricter compliance requirements on stablecoin issuers, issuers are responding by freezing more aggressively to avoid enforcement risk. This means false positives will continue to be a problem, and the appeals process will remain the primary recourse for innocent users caught in the compliance net.

The bottom line

Every major centralized stablecoin — USDT, USDC, FDUSD, PYUSD, TUSD — can be frozen by its issuer. The freeze is built into the smart contract and cannot be circumvented. If your stablecoins are frozen, the only recourse is to appeal to the issuer, which requires documentation, patience, and in most cases, legal representation. Decentralized stablecoins like DAI cannot be frozen by an issuer, but they can be blocked from interacting with their protocol.

If your stablecoins have been frozen, contact us. We have experience appealing freezes with Circle, Tether, First Digital, and Paxos. The earlier you act, the better your chances of recovery.

N. Silinevics
Nils Silinevics Crypto Compliance Counsel · Former FIU Investigator · Valken Legal AG