Circle blocks $12.6M USDC tied to Zama privacy protocol

Circle has reportedly frozen about $12.6 million worth of USDC tied to Zama’s confidential contract, a move observed by on-chain researcher ZachXBT. The USDC in question is associated with Zama’s privacy-focused protocol, and the contract is publicly labeled on block explorers as well as in the protocol’s technical documentation. The exact rationale behind the freeze remains unclear, even as researchers note a notable around-the-calance transaction from Overnight Finance into the Zama ecosystem earlier this month.

According to ZachXBT, the Zama contract’s status is well-known in on-chain tooling, and the freeze appears to have occurred despite the lack of an explicit explanation from Circle. ZachXBT pointed to a May 11, 2026 deposit of approximately $12.4 million into the Zama protocol from Overnight Finance, a governance-friendly DeFi platform whose treasury movements have drawn scrutiny in related discussions. The broader point, as ZachXBT framed it, is that unilateral freezes where funds are commingled with a separate protocol’s users set a controversial precedent for custodians acting over interconnected contracts.

“Overnight Finance held a governance vote recently to distribute treasury funds after holders alleged the team was rug-pulling. Regardless, it's precedent-setting to unilaterally freeze the contracts or addresses of a protocol where funds have been commingled with Zama users.”

Circle confirmed to Cointelegraph that it is reviewing the matter, but the company had not provided a response by the time of publishing. The situation adds to a long-running critique of Circle’s approach to freezing funds, as opposed to simply freezing wallets tied to hacks or to projects the firm deems at fault—an issue that has repeatedly resurfaced in recent coverage.

Circle’s broader track record on asset freezes has become a flashpoint for critics who say the company has, at times, moved too quickly to lock funds linked to legitimate projects while appearing slow to act in other high‑profile security incidents. In March, ZachXBT alleged that Circle wrongfully froze 16 stablecoin wallets tied to online casinos and other legitimate crypto ventures. Those wallets were linked to civil cases in the United States, yet the broader connection appeared tenuous to some observers, according to the researcher.

Beyond those episodes, ZachXBT has compiled a wider list of incidents since 2022 in which Circle’s failure to freeze funds was alleged to have occurred, including situations involving stolen funds or suspicious activity tied to hacks. One notable item cited in the discourse was the Drift Protocol breach in April 2026, where approximately $232 million in user funds were reportedly not frozen in a timely manner, despite Circle’s tools and access to the Cross-Chain Transfer Protocol (CCTP). The matter helped spur a class-action filing against Circle over the handling of the Drift incident and the movement of funds across bridges it operates.

As the Drift case illustrates, the tension between rapid containment of illicit flows and due process protections for legitimate users remains a central theme in Circle’s public-facing strategy. The Drift situation also spotlighted Circle’s CCTP as a bridge facilitating asset transfers across networks, a mechanism that, in hindsight, highlighted how a single platform’s decisions can ripple through multiple ecosystems. Circle’s decision-making around these tools—coupled with governance debates within the broader crypto community—continues to attract regulatory and investor attention.

Key takeaways

• Circle reportedly froze about $12.6 million in USDC connected to Zama’s confidential contract, putting a spotlight on how privacy-focused DeFi constructs intersect with centralized risk controls.


• The precise reason for the freeze remains unclear, underscoring uncertainty around when and why custodians intervene in mixed funds within cross-contract ecosystems.


• The Zama contract is publicly labeled on block explorers and described in the privacy protocol’s documentation, a detail highlighted by on-chain researcher ZachXBT.


• Circle has faced ongoing criticism for its handling of freezes—allegations include failing to freeze funds in high-profile hacks and freezing wallets tied to legitimate projects without clear notice, a pattern that has fed broader debates about governance and user protection.

Context: privacy, custody, and the evolving DeFi landscape

The case against Circle sits at an intersection of two rapidly evolving strands in crypto: privacy-preserving protocols and the responsible management of funds across interconnected on-chain ecosystems. Zama’s model—relying on a confidential USDC contract within a privacy-focused framework—illustrates how modern DeFi assets can travel through multiple layers of abstraction and custody. When a centralized issuer exercises a freeze, it raises questions about how privacy-enabling designs should be reconciled with risk controls and regulatory expectations.

From a policy and investor viewpoint, the episode matters because it signals how custodial actions can affect user trust in stablecoins and cross-chain services alike. If large holders, protocols, or wallets perceive that funds can be immobilized without a clear, auditable process, it could influence how developers design privacy features, governance mechanisms, and treasury management practices. The balance between preventing illicit activity and preserving legitimate user funds remains delicate, and the evolving regulatory environment will likely amplify scrutiny of such moves.

What comes next for Circle and the Zama episode

Readers should watch for Circle’s official statement clarifying the rationale behind the freeze. The timing and specifics of any formal disclosure could influence how market participants assess the risk framework around stablecoins and privacy-enabled DeFi contracts. Regulators may also weigh in on the implications for financial censorship, fund recovery mechanics, and the interaction between custodial actions and user rights in decentralized networks.

For builders and users, this episode underscores the importance of transparent governance and clear risk disclosures when funds flow through multi-layer architectures. As DeFi continues to blur lines between on-chain privacy and centralized oversight, observers will be looking for concrete standards that reconcile privacy with safety, accountability, and predictable responses to security incidents.

Meanwhile, the broader crypto community will be monitoring whether Circle adjusts its policy on freezing funds, especially when tied to legitimate projects, and how the company communicates such actions in the future. The Drift aftermath, ongoing legal considerations, and the interplay with cross-chain tooling like CCTP will all shape future occurrences and investor sentiment in this evolving space.

What remains uncertain is how common such unilateral interventions will become as protocols grow more interconnected and as governance processes mature. Readers should stay tuned for updates on Circle’s position, any formal governance decisions from involved projects, and potential regulatory responses that could redefine expectations around asset freezes and cross-chain custody.

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