PANews reported on June 9th that Circle announced cirBTC has launched on Ethereum, providing 1:1 Bitcoin-backed collateral for the institutional DeFi market. cirBTC is backed 1:1 by native BTC custodied by Circle, providing on-chain reserve transparency through Chainlink proof-of-reserve. cirBTC can be integrated into Circle Mint for minting and redemption, forming a unified operating model with USDC for USD liquidity and Bitcoin collateral. In the future, cirBTC will also expand to multiple chains through Arc.