Circle has launched cirBTC on Ethereum, offering 1:1 Bitcoin-backed collateral for the institutional DeFi market. Backed by native BTC custodied by Circle, cirBTC ensures on-chain reserve transparency via Chainlink's proof-of-reserve. This new offering can be integrated into Circle Mint for seamless minting and redemption, aligning with USDC for USD liquidity and Bitcoin collateral. Circle plans to expand cirBTC to multiple chains through Arc in the future.