Circle Launches cirBTC to Bring Institutional-Grade Wrapped Bitcoin to Ethereum
The company behind USDC launched cirBTC on June 9 — an Ethereum-based ERC-20 backed 1:1 by BTC — without publishing any circulating supply or trading data at debut, per reporting from Value The Markets.
Circle's cirBTC Drops Into a $13B Wrapped Bitcoin Stack — Zero Float Disclosed
Circle has quietly put a third institutional-grade wrapped Bitcoin product into a market already valued between $12.5 billion and $13.5 billion. The company behind USDC launched cirBTC on June 9 — an Ethereum-based ERC-20 backed 1:1 by BTC — without publishing any circulating supply or trading data at debut, per reporting from Value The Markets. For allocators watching institutional BTC rails, the silence on float is the signal, not the launch itself.
Mechanics: Segregated Custody, Chainlink Proof of Reserve
The product mirrors the operational scaffolding Circle already runs for USDC and EURC. Deposited BTC is held in segregated accounts — no co-mingling — and reserve attestation runs through Chainlink's Proof of Reserve oracle, giving on-chain, real-time verification of backing. The design choice matters: segregated custody removes the single point-of-failure risk that historically plagued wrapped-Bitcoin competitors and lets institutional treasuries interact with Aave, Uniswap, and similar venues without taking direct custody of the underlying asset.
Competitive Landscape: WBTC and cbBTC Still Dominate
At launch, WBTC carried roughly $7.3 billion in market cap and Coinbase's cbBTC sat near $5.4 billion — together absorbing the majority of synthetic BTC liquidity. Circle enters as a third rail, not a challenger to either. The gap between the top two incumbents and a zero-disclosed float product is the structural hurdle: without minted supply visible, there is no on-chain footprint for market makers to arbitrage or for risk managers to model. CirBTC's edge is regulatory familiarity and Circle's existing institutional relationships, not liquidity depth.
Arc Mainnet as the Real Catalyst
The operative date is September 16, 2026 — the Arc mainnet launch, which Circle is positioning as the unlock for cirBTC utility inside DeFi. Until then, the token is essentially a reserve infrastructure play awaiting its first measurable yield loop. Verdict: yield sustainability cannot be assessed yet. Track three metrics post-Arc: minted supply on Ethereum, Chainlink PoR attestation cadence, and net flows versus WBTC/cbBTC on lending venues. Until float prints, cirBTC is a custody story, not a yield one.