Wrapped Bitcoin is no longer a one-product market. wBTC opened the category in 2019, kept it for five years, and weathered a governance scare in 2024. Now Circle is entering with cirBTC, a wrapped BTC built on the same compliance posture that made USDC the institutional default. This is a side-by-side look at how the two compare across custody, transparency, supply, supported chains, fees, and target user, with notes on where each one fits in 2026.
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Both tokens promise the same headline: one ERC-20 token, redeemable 1:1 for native Bitcoin. The difference sits in who holds the BTC, how the reserves are proven, which chains the token reaches first, and which audience the issuer is built for. wBTC is the incumbent with deep DeFi integrations. cirBTC is the new entrant aiming at OTC desks, market makers, lenders, and treasuries that already trust Circle for USDC.

wBTC is the first widely adopted wrapped Bitcoin. BitGo holds native BTC in qualified custody, and an ERC-20 token is minted on Ethereum at a 1:1 ratio. A merchant network (Alameda, CoinList, Kyber, and others historically) handles mint and burn requests for end users, while BitGo runs the underlying custody and proof of reserves.
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For five years wBTC was the only meaningful way to bring Bitcoin into DeFi at scale. It became the default collateral on Aave, MakerDAO (now Sky), and Compound, and it dominated wrapped BTC supply by an order of magnitude. By late 2024 it had pushed past $10B in circulation at its peak. BitGo's wBTC page remains the authoritative source for current supply and merchant directory.
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cirBTC is Circle's wrapped Bitcoin. The product page at circle.com/cirbtc describes it as 1:1 backed by native BTC, with reserves verifiable onchain, launching first on Ethereum and Arc (Circle's L1). Circle has framed it as a complement to USDC and EURC, slotting Bitcoin into the same compliance and transparency framework that institutions already use for stablecoins.
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The timing is not accidental. wBTC's 2024 governance episode, when BitGo proposed transferring custody control to a joint venture with BiT Global, prompted Sky to pause new wBTC collateral and pushed several venues to list alternatives. Coinbase shipped cbBTC in September 2024. Circle's entry continues that trend: institutions want wrapped BTC backed by issuers they already trust at the stablecoin layer.
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wBTC's custody is split between BitGo Trust Company and BiT Global, the additional custodian added in 2024 to defuse single-custodian concentration. Mint and burn flow through the WBTC merchant network, with onchain proofs published continuously. This is a trust-company model: regulated qualified custodians hold the BTC, attested by audits and onchain reserves.
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cirBTC's custody runs through Circle's existing institutional stack. Circle has spent years building the operational rails behind USDC (banking partners, attestations, redemption pathways) and is extending that same posture to BTC. For a treasury that already mints USDC through Circle Mint, holding cirBTC adds one more asset to the same account relationship rather than spinning up a new custodian.
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wBTC publishes a live proof-of-reserves dashboard at wbtc.network listing the Bitcoin addresses holding the underlying BTC, the ERC-20 supply, and any deviation between them. Third-party attestations supplement the dashboard.
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cirBTC will lean on the model Circle uses for USDC: onchain reserves data plus monthly attestations from a top accounting firm. Circle's positioning emphasizes that reserves are "verifiable onchain," meaning institutions can confirm backing without waiting for a quarterly report. The mechanics will be clearer at mainnet launch.
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wBTC's home is Ethereum, where the canonical contract lives. Bridged versions exist across most major L1s and L2s, but those are wrapped wrappers (BTC under wBTC under a bridge token), which adds a layer of bridge risk on each hop. DeFiLlama's wBTC page tracks supply across chains.
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cirBTC launches natively on Ethereum and on Arc, Circle's purpose-built L1. Native issuance on Arc matters because Arc is engineered around USDC, EURC, and now cirBTC as first-class assets. Over time Circle is likely to expand to more chains the same way it did with USDC, but the day-one footprint is narrower than wBTC's.
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wBTC's circulating supply, available on DeFiLlama and on BitGo's dashboard, has anchored the wrapped BTC market for years. Even after 2024's outflows, it remains the largest by a wide margin. Deep liquidity on Uniswap, Curve, Aave, and major centralized venues makes it the easiest wrapped BTC to swap in size.
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cirBTC starts at zero. Initial liquidity will depend on which OTC desks and market makers Circle lines up as authorized participants, similar to how USDC's secondary market scaled. Expect concentrated, deep liquidity on Ethereum and Arc first, then a broader rollout.
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wBTC was built for DeFi. Its merchant network, fee structure, and integrations all assume a DeFi-native user who wants BTC inside Ethereum protocols. Retail holders use it. Lending markets use it. Cross-chain bridges use it.
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cirBTC is built for institutions that already operate through Circle. OTC desks settling block trades, market makers running delta-neutral books, lending protocols listing institutional collateral, and corporate treasuries holding Bitcoin onchain are the named buyers on Circle's launch page. DeFi participation will follow, but the priority order is reversed from wBTC.
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wBTC charges minting and burning fees at the custodian layer, and merchants may add their own spread. For most users, the practical cost is the secondary market spread on Ethereum, which is tight on size.
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cirBTC fees have not been published. Based on Circle's USDC pricing posture (free mint and burn for Circle Mint customers above thresholds, with operational fees on edge cases) it is reasonable to expect institutional-friendly pricing, but the exact schedule will land with the launch.
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Both products operate under regulated custodians, but the framing differs. wBTC's posture rests on BitGo's and BiT Global's trust-company licenses. cirBTC inherits Circle's regulatory footprint: NYDFS, EU MiCA compliance for EURC, and the broader institutional licensing Circle has built since 2018. For a treasury operating under a strict compliance regime, that lineage matters.
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No, and Circle has not framed it that way. wBTC remains the most liquid wrapped BTC on Ethereum and the default collateral across major lending markets. cirBTC adds a parallel option for institutions that want wrapped BTC under Circle's umbrella, especially on Arc. Most large players will end up holding both, picking by venue, counterparty, and chain.
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Use wBTC when you need the deepest liquidity and the broadest DeFi integration today. Use cirBTC, once live, when your stack is already built around Circle (USDC, EURC, Circle Mint, Arc) and you want a wrapped BTC that fits into the same operational flow. For cross-chain movement, Eco Routes can orchestrate either asset across the chains it supports.
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This comparison draws on Circle's product disclosures at circle.com/cirbtc, BitGo's wBTC documentation at bitgo.com/wbtc, and supply data from DeFiLlama. cirBTC specifics reflect Circle's announced design and are subject to change before mainnet launch. wBTC custody facts reflect the 2024 multi-custodian update adding BiT Global alongside BitGo Trust.
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