Circle froze $12.6M backing Zama's confidential USDC (cUSDC), preventing users from redeeming their tokens and reigniting concerns about centralized control in stablecoins. Primary reason: Circle blacklisted Zama's cUSDC contract, effectively freezing the underlying USDC reserves and halting redemptions. Secondary reasons: The funds were reportedly linked to a wallet associated with Overnight Finance, which recently faced governance and treasury-related controversy. Near-term outlook: The key question is whether Circle provides a public explanation or reverses the blacklist. Until then, cUSDC holders remain exposed to uncertainty and liquidity risk. My view: This is a reminder that even when DeFi applications are decentralized, the stablecoins they rely on often are not. Privacy-focused protocols like Zama can build innovative technology, but if the underlying asset is USDC, Circle ultimately retains the ability to freeze funds. The bigger story isn't the $12.6M itself—it's the precedent. Projects focused on privacy and censorship resistance may increasingly look toward more decentralized collateral options if incidents like this become more common.