BTC holders can borrow against native Bitcoin collateral without selling it upfront, wrapping it, bridging it, or handing it to a custodial lender. BTC remains in a Taproot vault on Bitcoin L1. Borrowers can receive UNIT, Ducat's BTC-backed Bitcoin L1 stablecoin, or access another stablecoin through a route that mints UNIT against the vault and swaps it for that stablecoin. The underlying BTC collateral and liquidation mechanism are the same. Both routes incur a 7% upfront minting fee. UNIT proceeds have no ongoing interest. Minimum collateralization is 160%, with liquidation triggered at 135%. That route connects Bitcoin collateral to the wider stablecoin ecosystem while leaving BTC on Bitcoin. Access is currently restricted during alpha. Borrowers must manage collateral health. BTC release follows repayment, required signatures, and Bitcoin confirmation.