cirBTC: A Clearer Reserve Standard for Wrapped BTC

Circle describes cirBTC as a wrapped Bitcoin token currently available on Ethereum that is intended to be backed and redeemable 1:1 by native BTC, allowing Bitcoin holders to use BTC-linked value in smart-contract applications such as lending, trading, collateral, and settlement without selling their underlying holdings. The company says the BTC reserves are held in segregated custody through its Bermuda affiliate and Circle National Trust, an OCC-supervised national trust bank, separate from Circle’s corporate assets. Its proof-of-reserve model combines publicly disclosed Bitcoin reserve addresses, Chainlink’s onchain reserve-data feeds, and the circulating cirBTC supply so market participants can compare collateral holdings with issued tokens. Circle presents this transparency, together with custody and redemption processes, as a framework for institutions to assess wrapped-Bitcoin risks, while noting that proof of reserves does not replace due diligence on custody, smart contracts, or redemption. cirBTC is planned for native support on Arc when its mainnet launches, subject to regulatory approvals, with further blockchain integrations anticipated.

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