Decentralized Finance (DeFi) has successfully rebuilt the plumbing of Wall Street (Trading, Lending, Derivatives) but has failed to replicate its engine: Credit. Currently, all DeFi lending is Over-Collateralized. To borrow $1.00, a user must deposit $1.50 in assets. This is not "Credit"; it is merely "Liquidity Swapping." It restricts DeFi to wealthy speculators and excludes 99% of global borrowers who need capital precisely because they do not have assets to pledge. The Klyrox Sovereign Credit Protocol introduces the first scalable framework for Under-Collateralized Lending on-chain. By transforming the Klyrox Identity Token (Epistemic Capital) into a programmable "Credit Score," we allow users to pledge their History instead of their Assets. This paper outlines the mathematical risk models that allow lenders to safely issue loans with 50% or even 0% collateral, unlocking a trillion-dollar market for on-chain personal finance.