A balance sheet can hold substantial bitcoin (BTC) reserves without supplying the operating liquidity an institution needs. Native BTC can anchor a long-term reserve strategy, but it cannot move into the smart contract networks where onchain borrowing, trading, and settlement occur. To raise liquidity without selling, an institution first needs a way to bring that BTC into onchain credit markets as collateral.
Circle Wrapped Bitcoin1 (cirBTC) provides that path. As a 1:1 BTC-backed token, cirBTC carries bitcoin into supported smart contract markets, where it can be supplied as collateral. An eligible institution can then borrow USDC2 against it and receive programmable, dollar-denominated capital that moves through those same markets, without selling its BTC.
The result is a collateral stack in which each asset does the job it’s best suited for: BTC anchors the balance sheet as long-duration collateral, and stablecoins (e.g., USDC) function as readily available working capital. Onchain credit markets become more useful as the connection between the two deepens.
Stablecoin liquidity and bitcoin collateral do different jobs in credit markets
Every credit market needs a credible asset side, a liquid funding side, and a way to settle. Collateral gives lenders a claim they can value and liquidate. Liquidity gives borrowers capital they can use immediately. Settlement turns that capital into completed transactions.
BTC is well suited to the first role. Its market depth, global recognition, and place on institutional balance sheets make it a natural collateral candidate. But BTC cannot fund dollar expenses or settle the dollar leg of a trade. And on its native network, it cannot interact with smart contract lending markets or meet a margin call through programmable logic, which is the gap cirBTC is built to close.
USDC is designed for the funding and settlement roles. It is a fully backed stablecoin, redeemable 1:1 for US dollars, that can move through onchain markets around the clock. It can be borrowed against collateral, transferred to a counterparty, held as treasury liquidity, or used to settle a transaction.
BTC provides the collateral value and USDC provides capital mobility. Neither role is secondary: collateral without liquidity sits idle, and liquidity without credible collateral has fewer productive places to go.
How cirBTC brings bitcoin collateral to programmable markets
cirBTC connects native BTC to supported smart contract networks without changing the asset’s underlying exposure. Eligible institutions can mint cirBTC by depositing BTC through Circle Mint3 and can redeem it for BTC the same way. Every cirBTC is backed 1:1 by native BTC. It is a wrapped token, not a staked version of BTC or a BTC derivative. Any yield comes from a third-party lending market, not from cirBTC itself.
The underlying BTC is held through Circle’s Bermuda affiliate and custodied on its behalf by Circle National Trust,4 a qualified custodian and federally chartered national trust bank. The BTC is held for the exclusive benefit of cirBTC holders in accounts segregated from Circle’s corporate assets.
A lending protocol, market maker, or risk desk needs to assess collateral before relying on it. To support that review, Circle uses Chainlink Proof of Reserve to publish reserve data onchain, and disclosed BTC addresses let counterparties review holdings directly on the Bitcoin network. As of October 19, 2026, public trackers already show tokenized BTC as a multi-billion-dollar category; the next stage of institutional wrapped bitcoin adoption depends on making that collateral easier to evaluate and use across markets.
How bitcoin-backed USDC borrowing works onchain
Once BTC-backed collateral can enter a smart contract market, USDC gives the borrower dollar liquidity to put to work. A simplified credit cycle looks like this:
- Collateral enters the market. An eligible institution deposits BTC, mints cirBTC, and supplies it to a supported third-party lending market through a wallet it controls.
- Dollar liquidity meets demand. USDC suppliers provide capital to the market. The protocol sets collateral requirements, borrowing rates, liquidity limits, and liquidation terms.
- Value moves and settles. The borrower draws USDC against its cirBTC and can use it for inventory, operating expenses, settlement, and more. Repaying the USDC loan releases the cirBTC collateral, which the institution can keep using in smart contract markets or redeem for BTC.
This structure preserves a clear division of labor. cirBTC does not generate a return by itself. Any borrowing or lending economics come from third-party lending protocols. USDC does not replace the BTC position. It gives BTC holders another source of liquidity without an outright BTC sale, while giving USDC holders a place to supply capital. The model supports a range of institutional participants:
- A market maker can finance inventory while seeking to retain BTC exposure.
- A bitcoin miner can access operating liquidity against its BTC holdings.
- A fund supplying USDC can participate in a supported credit market with disclosed collateral and protocol-defined terms.
- An OTC desk can arrange a block trade and settle the dollar leg onchain.
Borrowers, lenders, and trading counterparties enter from different sides, but they meet in the same onchain credit market.
Why a unified operating model can reduce institutional friction
Institutions do not evaluate a collateral or settlement asset in isolation. They evaluate the full path from custody through tokenization, credit, settlement, repayment, and redemption. Each additional handoff adds another interface to integrate, monitor, and reconcile.
cirBTC and USDC are issued by Circle affiliates and designed to work through Circle infrastructure. For eligible Mint customers, Digital Asset-Backed Borrowing5 provides a coordinated workflow to deposit BTC, mint cirBTC, supply it through a supported third-party lending market, and receive borrowed USDC in their Mint account. The customer controls the wallet used with the protocol, and the third-party market sets its own rates, parameters, liquidity, and liquidation mechanics.
Circle also maintains issuer neutrality. It does not operate a competing centralized exchange (CEX), decentralized exchange (DEX), or lending protocol. The objective is broad use of cirBTC and USDC across third-party venues, not control of the markets where they meet. Institutions keep their venue relationships while using a more consistent path between collateral and settlement assets.
How Arc connects bitcoin collateral, USDC liquidity, and settlement
On Arc, cirBTC is available as programmable bitcoin collateral, and third-party protocols, including Aave and Morpho, provide lending and borrowing markets with their own terms and controls. USDC serves as the network’s native gas token for transaction fees and its settlement asset, and Arc’s deterministic sub-second finality gives market participants a shared settlement layer for moving from collateral to credit to completed transactions.
Arc is central to this design, but the model is not confined to any one blockchain. cirBTC is available on Arc and Ethereum. Arc gives cirBTC and USDC a native environment inside Circle’s full-stack platform, while Ethereum connects the collateral stack to established decentralized finance (DeFi) markets and institutional workflows.
Institutional liquidity does not remain in one venue, so collateral infrastructure must reach the markets where counterparties already operate. cirBTC is designed for broader multichain expansion over time while maintaining a consistent reserve and redemption model.
Building the collateral stack for onchain credit markets
The next step in wrapped bitcoin utility is connecting bitcoin’s role as collateral with digital dollars built for liquidity and settlement, rather than making BTC behave like digital cash. cirBTC gives BTC a path into programmable credit markets. USDC gives those markets a liquid dollar asset for borrowing, deployment, repayment, and settlement. Arc, Ethereum, Mint, and third-party lending protocols provide the infrastructure that connects them. As both sides deepen, BTC can support more financial activity without abandoning the role that made it valuable in the first place.
1 cirBTC is issued by Circle International Bermuda Limited, a Class F Digital Asset Business licensed and regulated by the Bermuda Monetary Authority. Circle Mint and related distribution services are provided by Circle Internet Financial, LLC, NMLS # 1201441.
2 USDC is issued by regulated affiliates of Circle. See Circle’s list of regulatory authorizations.
3 Circle Mint and money transmission services are provided by Circle Internet Financial, LLC. Circle Internet Financial, LLC, NMLS # 1201441, is a licensed provider of money transmission services. See Circle’s licenses here. Circle Mint is currently available only to institutions and is not available to individuals.
4 USDC is issued by Circle Internet Financial, LLC (NMLS #1201441) and is a separate product from any custody services provided by Circle National Trust or Circle New York Trust. Circle National Trust is the trade name of First National Digital Currency Bank, N.A., a national trust bank chartered and regulated by the Office of the Comptroller of the Currency (OCC), providing custody of digital assets. Digital assets are not deposits, are not insured by the Federal Deposit Insurance Corporation (FDIC), and may be subject to investment and other risks. Circle National Trust does not accept deposits or make loans.
5 Digital Asset-Backed Borrowing is provided by Circle Technology Services, LLC through a customer-controlled Smart Wallet and is available to eligible Circle Mint customers, excluding New York clients, and subject to jurisdiction and eligibility.