circle

According to Arkham monitoring, Circle has just transferred 4.397 billion USDC to Coinbase via HyperEVM.

According to monitoring by Arkham, Circle transferred approximately $4.397 billion USDC to addresses related to Coinbase on the HyperEVM network, making it the largest single USDC transfer recorded to date.

According to Cointelegraph, Circle has issued 1 billion USDC on Solana in the past 24 hours, bringing the total issuance in 2026 to 57 billion.

A female tycoon in the domestic cryptocurrency circle encountered an investment scam in the United States, resulting in a loss of over $9.4 million (approximately 60 million yuan). Reports indicate that this individual is a certain Lv, the CEO of a computing power technology company in Southwest China, whose mining pool reportedly accounted for about 9% of the global Bitcoin total computing power at its peak.The report pointed out that two brothers, claiming to have a "Middle Eastern royal family" background, carried out the scam by forging identities. One of them claimed to be a "Middle Eastern royal family son-in-law" and asserted that he controlled funds from Middle Eastern families, international business relations, and resources from local governments in the United States; the other mimicked a character from the American drama "Billions," presenting himself as a hedge fund manager. The two also successfully contacted and influenced Michael Smedley, the chief of staff to the mayor of East Cleveland, Ohio, ultimately inducing Lv to sign a cryptocurrency mining field development contract.

Circle plans to release the Arc Privacy confidential smart contract engine, aimed at addressing the barriers to institutional adoption caused by the current blockchain's default complete transparency through "Opt-in Privacy." Arc Privacy will allow users and developers to selectively mask sensitive information in transactions and smart contracts based on actual needs, rather than forcing all data to be public. At the same time, it retains the authorized access required for compliance, auditing, and governance, achieving a balance between privacy and auditability.The engine supports the EVM environment and emphasizes composability, allowing developers to build multi-step private application processes in the Ethereum environment. The article lists several real business scenarios, including confidential salary payments, treasury fund transfers, tokenized asset management, confidential perpetual contract trading, and privacy lending.

According to official news, Circle announced that cirBTC has launched on Ethereum, providing 1:1 Bitcoin-backed collateral for the institutional DeFi market. cirBTC is supported by native BTC held in custody by Circle at a 1:1 ratio, offering on-chain reserve transparency through Chainlink reserve proofs.cirBTC can be integrated into Circle Mint for minting and redemption, and it forms a unified operational model of dollar liquidity and Bitcoin collateral with USDC. In the future, cirBTC will also expand to multiple chains through Arc.

According to Whale Alert monitoring, Circle issued an additional 250 million USDC on Solana at 16:53 Beijing time, bringing the total additional issuance on Solana to 500 million USDC within about half an hour.

Zama's official response to Circle's freezing of the cUSDC contract event states that Circle's compliance system flagged a wallet belonging to an external depositor. Since this wallet holds funds in the cUSDC contract, the entire contract was automatically swept into a standard holding freeze. This is merely incidental damage and not a sanction against the Zama Protocol. The Zama legal team has intervened and is isolating the flagged address, and will restore access for all unaffected participants as soon as possible.

"On-chain detective" ZachXBT posted that the stablecoin issuer Circle blacklisted the privacy protocol Zama's Confidential USDC (cUSDC) contract on Ethereum about 7 hours ago, resulting in approximately 12.6 million USDC being frozen within the contract.ZachXBT stated that the cUSDC contract has been publicly labeled in both Zama's official documentation and blockchain explorers. The specific reason for Circle freezing the related USDC is currently unclear. ZachXBT also pointed out that it had disclosed in March 2026 that Circle froze over 16 hot wallet addresses belonging to enterprises, protocols, and service providers without providing transparent explanations.

Circle released a quantum security white paper, proposing a phased upgrade plan covering Arc, USDC, smart contracts, and the validator system to address potential security risks posed by future quantum computing.

Circle released the "Post-Quantum Security White Paper," proposing a phased post-quantum resilience roadmap focused on the long-term security of the Arc blockchain ecosystem.The roadmap covers multiple technical directions, including quantum secure signatures, private execution environments, validator hardening, infrastructure migration, and account recovery, applicable to core components such as the Arc network, USDC, smart contracts, and validators.Circle stated that it plans to provide post-quantum signature support when the Arc mainnet launches (in 2026) to enhance the ecosystem's ability to respond to future quantum computing threats.

According to Cointelegraph, Circle minted 500 million USDC on Solana today.

According to SolanaFloor monitoring, Circle has issued approximately 250 million USDC on the Solana network in the past 6 hours.

According to official data, in the 7 days ending May 21, Circle issued approximately 8.1 billion USDC, redeemed about 7.7 billion USDC, and the circulation increased by approximately 400 million. The total circulation of USDC is 76.9 billion, with reserves of about 77.1 billion USD, including overnight reverse government bond repurchases of about 45.7 billion USD; government bonds with maturities of less than 3 months of about 18.6 billion USD; deposits from systemically important institutions of about 12.2 billion USD; and other bank deposits of about 600 million USD.

According to official news, Circle CEO Jeremy Allaire stated in a social media post that cirBTC is about to launch. Circle Wrapped Bitcoin (abbreviated as cirBTC) is a tokenized BTC that is 1:1 backed by native Bitcoin (BTC), issued by Circle on the Ethereum mainnet and Arc network.Each cirBTC is supported by a reserve of 1:1 native BTC, which is held in custody by a regulated entity under the Circle group.

According to the 13F filing submitted by the Australian financial services company Macquarie Group Ltd in mid-May, comparing the two periods ending December 31, 2025, and March 31, 2026, its IBIT holdings decreased from 5.126 million shares to 4.139 million shares, a reduction of about 19.3%, corresponding to an asset value decrease from approximately $255 million to $159 million; the ETHA holdings also decreased from 3.634 million shares to 3.289 million shares, a reduction of about 9.5%, corresponding to an asset value decrease from approximately $81.5 million to $52.1 million.At the same time, in the crypto stock sector, Macquarie Group reduced its position in Coinbase by 19%, but increased its position in Circle by 188% (valued at $2.326 million at the end of the first quarter) and added a position in BitMine (valued at $4.153 million at the end of the first quarter). In contrast, it did not show aggressive increases in the AI sector either, but rather maintained a cautious overall stance, with positions in Nvidia, Palantir, AMD, and others significantly decreasing, while only a few semiconductor stocks like Micron Technology saw slight increases.

According to SolanaFloor monitoring, Circle has minted approximately 500 million USDC on the Solana chain in the past 24 hours.