CBTC Explained: How Wrapped Bitcoin Works on Canton Network
CBTC brings Bitcoin into institutional DeFi on Canton -- with 1:1 BTC backing, Chainlink proof of reserve, and sub-transaction privacy.
CBTC is a wrapped Bitcoin token native to the Canton Network. It represents a 1:1 claim on Bitcoin held in institutional custody, enabling holders to use Bitcoin's value within Canton's privacy-preserving DeFi ecosystem without moving native BTC on the Bitcoin blockchain.
For institutions that hold Bitcoin as a reserve asset but need to deploy it as collateral, trading capital, or settlement currency, CBTC bridges the gap between Bitcoin's store of value and Canton's programmable financial infrastructure.
What Problem Does CBTC Solve?
Bitcoin is the most liquid cryptocurrency, but its native blockchain has limited smart contract capabilities. Institutions holding BTC cannot use it efficiently as collateral or settlement currency in sophisticated financial workflows. Moving Bitcoin on-chain is slow (10-minute block times) and fully transparent.
CBTC solves this by representing Bitcoin on Canton, where it inherits sub-transaction privacy, deterministic finality (~1.2 seconds), and Daml smart contract programmability. An institution can pledge CBTC as collateral in a private lending arrangement without revealing its BTC holdings to the broader network.
How CBTC Works: The Minting Process
- ◆Deposit -- An authorized user deposits BTC with the designated custody provider in cold storage or segregated accounts.
- ◆Mint -- Once the BTC deposit is confirmed, an equivalent amount of CBTC is minted on Canton and credited to the depositor.
- ◆Use -- The holder can use CBTC across Canton's DeFi ecosystem: as collateral, in trades, for settlement, or in lending protocols.
- ◆Redeem -- To convert back, the holder burns CBTC on Canton and the equivalent BTC is released from custody.
Chainlink Proof of Reserve
Chainlink's proof-of-reserve (PoR) protocol provides continuous, automated verification that BTC reserves match or exceed the total CBTC supply. Chainlink's decentralized oracle network periodically queries the custody provider's Bitcoin addresses and compares the balance against total CBTC minted on Canton. If a discrepancy is detected, the system can trigger alerts and halt minting.
Unlike traditional quarterly audits, Chainlink PoR operates continuously, providing near-real-time collateral transparency without exposing individual holder data.
CBTC Use Cases in Institutional DeFi
Collateral for Lending and Borrowing
Institutions can pledge CBTC as collateral to borrow USDCx or other assets. This enables leverage without selling underlying Bitcoin exposure.
Repo and Margin Arrangements
CBTC can serve as collateral in intraday repo markets with the same confidentiality expectations as traditional bilateral repo agreements, thanks to Canton's privacy model.
Trading on Canton DEXs
CBTC is tradable on Canton-native decentralized exchanges with privacy-preserving order matching, ensuring trade sizes and strategies are not visible to other participants.
Cross-Asset Settlement
CBTC enables delivery-versus-payment (DvP) settlement involving Bitcoin on Canton. A tokenized bond purchase priced in BTC can settle atomically — the bond token and CBTC move simultaneously in a single deterministic transaction.
CBTC vs WBTC
| Feature | CBTC (Canton) | WBTC (Ethereum) |
|---|---|---|
| Privacy | Sub-transaction privacy | Fully public |
| Reserve Proof | Chainlink PoR (continuous) | Attestation-based |
| Finality | Deterministic (~1.2s) | Probabilistic (~12min) |
| Target Users | Institutional finance | Retail DeFi |
| Smart Contracts | Daml | Solidity (ERC-20) |
How to Get CBTC
CBTC is available through authorized minting partners on Canton. Institutional users deposit BTC directly with the custody provider. For secondary market access, CBTC trades on Canton-based venues. Check the Canton ecosystem page for supported on-ramps.
Risks and Considerations
Like all wrapped assets, CBTC introduces counterparty risk through the custody provider. While Chainlink PoR mitigates reserve risk, smart contract risk, operational risk, and regulatory risk remain. Evaluate the custody provider's insurance coverage, security practices, and regulatory status before committing capital. For more on Canton's security model, see our dedicated guide.