# Circle Freezes $12.6M in Zama’s Confidential USDC Without Notice — Court Order Triggers DeFi Shockwave
Circle, the issuer of the USDC stablecoin, has blacklisted the smart contract address powering Zama’s Confidential USDC (cUSDC) protocol on Ethereum, freezing approximately $12.6 million in user funds without prior warning. The move, executed on May 30 at roughly 1:08 UTC, comes in response to a US federal court temporary restraining order linked to a civil lawsuit against Overnight Finance founder Maxim Ermilov.
Blockchain investigator ZachXBT was first to flag the freeze, posting findings to his Telegram channel hours after the blacklist took effect. By the time the crypto community began reacting, the funds were already locked.
## A Court-Ordered Freeze With Unintended Victims
The blacklist stems from a class-action lawsuit filed May 28 in the US District Court for the Northern District of California. The case, *Newton AC/DC Fund LP et al. v. Maxim Ermilov et al.*, alleges Ermilov misappropriated more than $15 million from Overnight Finance’s treasury. Judge P. Casey Pitts issued a TRO on May 29 directing Circle to freeze assets linked to the alleged transfers.
On-chain data traced the problematic deposit back to wallet 0xf7Fcc767dE537953b3519D4b3097A24A6dFE1c84 — tied to Overnight Finance treasury operations — which deposited roughly 12.4 million USDC into Zama’s cUSDC contract on May 11. However, because cUSDC operates as a pooled contract using fully homomorphic encryption (FHE) to obscure individual balances, Circle’s blacklist froze the entire pool rather than isolating the specific funds in question.
“Neither Zama nor its users appear to have received any communication before the freeze took effect,” noted on-chain analysts, raising questions about due process in the context of smart contract-based pooled assets.
## Zama’s Response and Path Forward
Zama CEO Rand Hindi addressed the incident, confirming the company is working to isolate the flagged deposit before the scheduled June 1 hearing. The company aims to restore access for unaffected users as quickly as possible once legal clarity emerges.
The incident highlights a structural tension in the DeFi ecosystem: privacy protocols that rely on centralized stablecoins like USDC retain a single point of failure. No matter how sophisticated the encryption, a court order directed at the issuer can freeze the entire contract.
## The Bigger Picture for Confidential DeFi
Zama’s cUSDC protocol is designed to use fully homomorphic encryption, letting users transact confidentially while still using USDC as the underlying asset. The appeal is clear — privacy in a transparent blockchain ecosystem. But Saturday’s freeze demonstrates that FHE can’t protect against issuer-level compliance actions.
For protocols building on USDC, this represents an unresolved risk. Circle operates under US law and must comply with court orders. When those orders target a pooled contract, all users in that pool bear the consequences, regardless of their individual involvement.
The broader DeFi market took notice: the incident drove home that “not your keys, not your crypto” now includes “not your keys, not your stablecoins either” when the issuer can freeze on demand.
## What Happens Next
The June 1 hearing will determine whether Circle can unfreeze the bulk of the funds while maintaining restrictions on the specific wallet tied to the lawsuit. Zama has indicated it will push for a targeted freeze rather than a blanket blacklist. The outcome could set a precedent for how courts and stablecoin issuers handle privacy-pooled assets going forward.
**Will Circle isolate the specific deposit or keep the entire contract frozen?** That question now hangs over every DeFi protocol using USDC in confidential contracts.
## Frequently Asked Questions
**What is Zama’s cUSDC?**
Zama’s Confidential USDC (cUSDC) is a privacy wrapper around Circle’s USDC that uses fully homomorphic encryption (FHE) to hide token balances on Ethereum. Users deposit USDC into the contract and receive cUSDC, which can be transacted privately.
**Why did Circle freeze the entire contract instead of just one address?**
Because cUSDC uses a pooled contract architecture, individual deposits are encrypted and indistinguishable on-chain. Circle could only blacklist the contract address as a whole, freezing all 12.6 million USDC held within it.
**Can affected users recover their funds?**
Zama is working to isolate the flagged deposit before the June 1 court hearing. If successful, unaffected users could regain access to their funds. The outcome depends on the court’s ruling and Circle’s willingness to implement a targeted freeze.
