Circle Freezes $12.6 Million USDC Linked to Privacy Protocol Zama
The debate over stablecoin centralization has reignited after Circle, the issuer of the USD Coin (USDC) stablecoin, blacklisted a smart contract containing $12.6 million. According to prominent on-chain investigator ZachXBT, the frozen funds are tied to the privacy-focused cryptography protocol Zama.
Key Takeaway: The frozen smart contract is a publicly labeled address used for Zama’s confidential USDC operations. On-chain data shows that wallets associated with the decentralized finance (DeFi) protocol Overnight Finance deposited $12.4 million into Zama shortly before the freeze took place.
Unannounced Actions and On-Chain Confusion
The sudden enforcement action has caught the protocol’s developers off guard. Reports indicate that the Zama team received no prior warning or explanation from Circle before the transaction capabilities of the contract were restricted. The exact legal or regulatory catalyst for the freeze remains undisclosed, though speculation points toward an ongoing, unrelated civil court proceeding in the United States.
“The lack of transparency in stablecoin blacklisting continues to create friction between centralized issuers and decentralized protocols, leaving legitimate builders in the dark.”
Critics Highlight Circle’s Selective Enforcement
This latest incident has amplified existing criticisms regarding how Circle manages its blacklisting power. On-chain sleuths and DeFi advocates have pointed out a stark contrast in the company’s enforcement speed. While legitimate protocols face sudden freezes, massive exploits often go unaddressed.
Circle’s Freezing Track Record (According to ZachXBT)
- $420 Million: Total stolen or fraudulent funds Circle allegedly failed to freeze across 15 major incidents since 2022.
- $232 Million: Funds stolen in the Drift Protocol hack that remained active despite a six-hour window for Circle to intervene.
- 16 Wallets: Legitimate exchange and casino addresses frozen in March 2026 due to unrelated civil litigation.
The perceived disparity in how security threats are handled has already led to legal repercussions. Following the Drift Protocol exploit, affected users initiated a class-action lawsuit against Circle, targeting its Cross-Chain Transfer Protocol (CCTP) for facilitating the movement of stolen assets.
FAQ
Why did Circle freeze the USDC?
While Circle has not released an official statement, on-chain analysts suggest the freeze is linked to an ongoing civil court case in the US, despite the Zama protocol not being directly involved in the dispute.
What is Zama?
Zama is a cryptography and privacy protocol specializing in Fully Homomorphic Encryption (FHE), allowing developers to build confidential smart contracts on public blockchains.
How does this affect the DeFi ecosystem?
Events like this highlight the regulatory risks of using centralized stablecoins like USDC within decentralized applications, driving some users toward decentralized or algorithmic alternatives.
