- Circle introduced cirBTC, a 1:1 BTC-backed token that brings bitcoin collateral into Ethereum-based DeFi applications.
- The underlying bitcoin is held in segregated custody, with reserves verified through Chainlink Proof of Reserve.
- Circle plans to expand cirBTC beyond Ethereum through Arc, supporting broader institutional multichain finance use cases.
Circle has launched cirBTC on Ethereum, introducing a wrapped bitcoin product designed for institutional use across decentralized finance markets. The launch brings 1:1 BTC-backed collateral to Ethereum-based financial applications, allowing institutions to use bitcoin in lending, trading, settlement, and treasury workflows without selling their underlying holdings. According to Circle, cirBTC is now live on Ethereum, with future integration planned for Arc.
Bitcoin Collateral Moves Into Ethereum Markets
The launch expands bitcoin’s utility within Ethereum’s established financial ecosystem. While bitcoin remains a widely used collateral asset, native BTC cannot directly interact with Ethereum smart contracts.
To address that limitation, Circle created cirBTC as a wrapped bitcoin token backed one-for-one by native BTC. As a result, institutions can move bitcoin-backed collateral through supported DeFi applications while the underlying BTC remains in custody.
Ethereum serves as the initial network because many institutional onchain activities already operate there. Notably, lending protocols, decentralized exchanges, tokenized assets, and stablecoin markets continue to support large volumes of activity.
As institutions increase their onchain participation, Circle has outlined how the asset is structured.
Circle Details Custody and Reserve Framework
According to Circle, every cirBTC token is backed by an equivalent amount of bitcoin. The company stated that the underlying BTC is held by a regulated Circle entity and remains segregated from corporate assets.
In addition, Circle said cirBTC provides reserve transparency through Chainlink Proof of Reserve. The system offers multi-address visibility, allowing market participants to review holdings directly on the Bitcoin blockchain.
Circle noted that market makers, lending platforms, OTC desks, and asset managers require collateral with visible custody and redemption processes. Consequently, the reserve structure aims to provide ongoing monitoring capabilities for institutions operating around the clock.
With custody and reserves addressed, Circle also highlighted how cirBTC fits within its broader infrastructure.
Arc Integration Planned as Multichain Strategy Expands
Circle said institutions can mint and redeem cirBTC through Circle Mint. The workflow places bitcoin collateral alongside USDC within the company’s existing infrastructure.
The company also stated that cirBTC is designed for a broader multichain future. While Ethereum serves as the starting point, Circle plans to bring cirBTC into Arc, its infrastructure focused on stablecoin finance.
According to Circle, the rollout combines bitcoin collateral, reserve transparency, segregated custody, and tokenized settlement within a single operational framework.
