Borrowing Against Bitcoin: The Cross-Chain Collateral Catch
Bitcoin holders can borrow cash without selling their BTC, but most DeFi lending apps run on Ethereum, creating a cross-chain hurdle.
Bitcoin owners who need liquidity can use their holdings as collateral for loans rather than selling outright. The strategy preserves exposure to potential price gains while unlocking fiat or stablecoins.
The catch, however, lies in network compatibility. A large share of decentralized lending applications are built on Ethereum, which cannot natively interact with Bitcoin's blockchain. As a result, BTC cannot be directly locked as collateral in these protocols without some workaround.
The Wrapped Bitcoin Solution
A common solution is to convert BTC into an ERC-20 token, such as Wrapped Bitcoin (WBTC), that represents Bitcoin on Ethereum. Borrowers then supply the wrapped token to an Ethereum-based lending pool and receive a loan in a stablecoin or other asset.
This approach adds extra steps and risks, including reliance on custodians or bridge operators that hold the original Bitcoin. Users must evaluate the security and trust assumptions involved in tokenization.
For borrowers willing to accept the additional complexity, the strategy offers a way to access liquidity without triggering a taxable sale of their Bitcoin. Still, the cross-chain process underscores the current fragmentation between Bitcoin and the broader DeFi ecosystem.