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BILL: Human-AI Collaboration NetworkCircle Freezes $12.6 Million in Confidential USDC, Exposing Surveillance Risks Circle blacklisted Zama’s confidential $USDC contract on Ethereum on May 30. The blac

Circle Freezes $12.6 Million in Confidential USDC, Exposing Surveillance Risks
Circle blacklisted Zama’s confidential $USDC contract on Ethereum on May 30. The blacklist freezes roughly $12.6 million held in a cUSDC token contract.

The freeze prevents holders of confidential $USDC (cUSDC) from redeeming the tokens for standard $USDC. The action raises fresh questions about issuer control over privacy-focused Decentralized Finance (DeFi) protocols.

Circle Blacklist Halts cUSDC Redemptions

Circle, the issuer of $USDC, maintains a built-in blacklist on the $USDC smart contract. Authorized Circle accounts add addresses, and blacklisted addresses cannot send or receive the stablecoin.

The frozen contract is an ERC-1967 proxy that holds $USDC on behalf of cUSDC token holders. Zama’s privacy protocol uses fully homomorphic encryption (FHE) to conceal balances and transfer amounts on public chains.

Circle blacklisted the Zama (privacy protocol) Confidential $USDC (cUSDC) contract on Ethereum. Source: USDTBanList

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Circle has not publicly explained the decision.

Past freezes have followed sanctions orders, court directives, or suspected illicit activity. The company blacklisted Tornado Cash-linked $USDC in 2022 after the U.S. Treasury sanctioned the mixer.

ZachXBT Links Freeze to Overnight Finance

On-chain investigator ZachXBT traced the underlying funds to a wallet, which deposited 12.4 million $USDC into Zama on May 11. The wallet appears to belong to Overnight Finance.

Update from ZachXBT.

What does this mean for privacy protocols? pic.twitter.com/1nAfXGnCoM

— wale.moca 🐳 (@waleswoosh) May 30, 2026

Overnight Finance recently held a Snapshot governance vote to distribute treasury funds after holders alleged the team was preparing to rug pull. The dispute may have triggered the freeze.

Regardless, it’s precedent-setting to unilaterally freeze the contracts or addresses of

Circle Freezes $12.6 Million in Confidential USDC,

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BILL: Human-AI Collaboration Network

Spain's National Police Dismantle Violent Crypto-Robbery Ring Linked to Tren de Aragua source-logo news.bitcoin.com ZEST: Bitcoin Lending Protocol ATWO: Fans Vote to Change Live OutcomesATWO: Fans Vot

Spain's National Police Dismantle Violent Crypto-Robbery Ring Linked to Tren de Aragua
source-logo  news.bitcoin.com


The National Police detained six individuals linked to the Tren de Aragua gang for their alleged involvement in a series of violent thefts targeting high-profile individuals possessing jewels and cryptocurrency. The group tied and held the victims at gunpoint in some cases.

Key Takeaways:

Spain’s National Police caught 6 Tren de Aragua members over a €1.3M crypto theft, with 3 jailed next.
Harming market safety, Tren de Aragua stole €1.3M in crypto, forcing Spain to next prosecute 6 suspects.
Following 2024 OFAC crypto sanctions, the US labeled Tren de Aragua an FTO to next block global laundering.
Spain’s National Police cracks down on Tren de Aragua-linked criminal group
Spain’s National Police have dismantled an organization that targeted high-profile individuals holding jewels, cash, and cryptocurrency.

On Thursday, the police revealed the arrest of 6 individuals who were allegedly part of this organization, which had ties to the Venezuelan criminal group Tren de Aragua. National Police started an investigation into this group in August 2025, examining a house theft in Madrid. In this instance, €1.5 million in jewels and watches and €1.3 million in cryptocurrency were stolen.

Spain's National Police Dismantle Violent Crypto-R

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"On-chain detective" ZachXBT disclosed on his personal channel that stablecoin issuer Circle has blacklisted the Confidential USDC (cUSDC) contract of the privacy protocol Zama on Ethereum, resulting 

ZachXBT: Circle Blacklists Zama's cUSDC Contract on Ethereum, Freezing $12.6 Million

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