Financial contracts are promises to pay, specifying who pays whom, how much, and when. These cashflows are the backbone of transaction processing, risk management, accounting, and other systems. The contractual cashflows are determined by a limited set of mathematical algorithms that contain inherent "certainty”. Nevertheless, the legal, academic, and financial communities have failed to recognize this “certainty”, leading to unstandardized representations of the same financial contracts across different systems and uses. This creates inefficiencies, vulnerabilities, and reconciliation burdens. We discuss how operationalizing "certainty" with standardized algorithms is essential for modernizing TradFi and providing the necessary foundation to scale DeFi ecosystems and integrate them with mainstream finance.