Circle Launches cirBTC, a Wrapped Bitcoin Aimed at Institutions
Stablecoin issuer Circle has launched cirBTC on Ethereum, a 1:1 Bitcoin-backed token with on-chain reserve verification, entering a wrapped-Bitcoin market led by WBTC and Coinbase's cbBTC.
Circle, the company behind the USDC stablecoin, announced on June 9, 2026 that cirBTC, its new wrapped Bitcoin token, is live on Ethereum. Each cirBTC is backed one-for-one by native Bitcoin held in custody, and the product is aimed squarely at institutions that want to use Bitcoin as collateral in on-chain finance.
What a wrapped Bitcoin is
Bitcoin and Ethereum are separate networks that cannot directly talk to each other. Bitcoin also has no support for the smart contracts — self-executing on-chain programs — that power lending markets, decentralized exchanges, and other applications on Ethereum. A wrapped Bitcoin solves this: a custodian holds real BTC and issues an equivalent token on Ethereum that can move through those applications. Redeem the token, and the custodian releases the underlying Bitcoin.
The model's weak point has always been trust in the custodian and the quality of its reserves. Circle is leaning on that concern as its pitch. The underlying Bitcoin is held by a regulated Circle entity — Circle International Bermuda, licensed by the Bermuda Monetary Authority — and segregated from the company's own corporate assets. Reserves are verifiable on-chain through Chainlink Proof of Reserve, with published addresses that counterparties can check directly against the Bitcoin blockchain.
A crowded field
Circle is not first. BitGo's WBTC, the original large wrapped Bitcoin, has a market value of roughly $7 billion, and Coinbase's cbBTC, launched in 2024, has grown to over $5 billion. Together, wrapped versions account for only about 1 percent of Bitcoin's total value — which is precisely the opportunity all three issuers see.
cirBTC plugs into Circle Mint, the company's existing institutional platform for creating and redeeming USDC, so firms already using Circle's stablecoin rails can handle Bitcoin collateral through the same workflows. Circle says the token will expand beyond Ethereum to additional blockchains, including Arc, its purpose-built settlement network.
The intended users are not retail traders but lending desks, market makers, treasury managers, and over-the-counter trading operations — businesses that want to post Bitcoin as collateral or settle trades without selling the underlying asset.
Why it matters
The launch is another marker of how the lines between stablecoin issuers, exchanges, and custody banks are blurring. Circle built its reputation on a dollar token governed by the new US stablecoin rules; it is now applying the same reserve-transparency playbook to Bitcoin itself.
For ordinary users, the practical effect is indirect. A more competitive wrapped-Bitcoin market can mean better-audited reserves and lower costs across DeFi. But a fully backed token still carries custodial risk — if the issuer fails or its custody is compromised, the wrapper is only as good as the claim behind it. Whether institutions actually adopt cirBTC over the incumbents will depend on liquidity and integrations, not just on the quality of the reserve reporting.
Sources
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