Bitcoin News: Circle has launched cirBTC, a 1:1 BTC-backed ERC-20 token now live on Ethereum mainnet, positioning it directly against WBTC’s roughly $9 billion market and approximately 85% market share with a feature its competitors do not offer: real-time on-chain reserve verification with no reliance on third-party attestations.
The product went live June 8, 2026, and is built exclusively for institutional participants, OTC desks, market makers, lenders, and DeFi protocols deploying Bitcoin as collateral inside Ethereum-based smart contract ecosystems.
Circle helped establish the institutional standard for dollar collateral with USDC.
Now cirBTC brings that same approach to Bitcoin, bringing 1:1 BTC-backed collateral to institutional DeFi markets with neutrality, transparency, and Circle…
The competitive target is explicit. BitGo’s Wrapped Bitcoin has dominated tokenized BTC since its January 2019 launch, and Coinbase’s cbBTC has emerged as the primary institutional challenger since September 2024, reaching approximately $5.9 billion in market value.
Circle is entering that race with a specific transparency argument and the institutional trust built over years of USDC issuance.
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Bitcoin News: cirBTC’s Reserve Verification Model, What Real-Time On-Chain Proof Actually Means
The core technical differentiator is Chainlink Proof of Reserve. Each cirBTC token issued as an ERC-20 on Ethereum is backed by native Bitcoin held in segregated regulated custody, and counterparties can verify that backing in real time through multiple wallet addresses visible directly on the Bitcoin blockchain, no waiting for monthly audits, no relying on custodian claims, no off-chain attestation lag.
This is structurally different from the WBTC model, where BitGo operates as the sole custodian and publishes wallet addresses for manual verification, but reserve confirmation still depends on BitGo’s centralized control and governance multisig for contract changes.
— Jeremy Allaire – jerallaire.arc (@jerallaire) June 8, 2026
The RenBTC wind-down and broader criticism of custodial bridge opacity established the trust gap Circle is explicitly targeting. Chainlink’s automated feed closes the verification loop at the contract level rather than at the audit cycle.
Bitcoin assets are kept separate from Circle’s corporate holdings, and minting and redemption run through Circle Mint, its institutional liquidity management platform.
The same infrastructure that powers USDC settlement rails is now extended to wrapped Bitcoin collateral, allowing firms to hold native BTC in custody while cirBTC moves through on-chain financial applications without ever selling the underlying position.
The $15–20B Tokenized BTC Market: Where cirBTC Fits Against WBTC and cbBTC
The total tokenized Bitcoin supply across all wrapped products sits at approximately $15–20 billion in Q2 2026, still under 2% of Bitcoin’s roughly $1.7 trillion market capitalization.
That number is either a ceiling that reflects structural barriers to institutional DeFi adoption or an enormous runway.
The evidence points firmly toward runway: institutional demand for Bitcoin exposure in regulated on-chain formats has accelerated materially since 2024, and the products capturing that demand are precisely the regulated, exchange-native wrappers cirBTC is competing against.
Jeremy Allaire just said it directly.
cirBTC (Circle's wrapped BTC) went live on Ethereum today.
WBTC holds approximately 119,000 tokens in circulation at roughly $8–9 billion market cap, controlling close to 85% of the wrapped BTC segment. cbBTC trails at approximately $5.9 billion but has grown faster than any comparable product since launch.
Other exchange-backed offerings, Kraken Wrapped BTC, Binance Wrapped BTC, Bitget Wrapped BTC, OKX Wrapped BTC, collectively hold the remaining margin.
Circle’s entry does not change the market structure overnight, but it introduces a credentialed issuer with an existing institutional distribution network that none of those exchange-native products can fully replicate.
Circle’s stated structural advantage over cbBTC and exchange-issued wrappers is neutrality: it does not operate a centralized exchange, DEX, or lending protocol.
Institutions using cirBTC as DeFi collateral are not simultaneously providing liquidity intelligence to a competing trading desk. That separation matters to prime brokerage clients and multi-venue market makers who treat information leakage as a material risk.
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