Routines in a data entry routine that test the input for correct and reasonable conditions, such as account numbers falling within a range, numeric data being all digits, dates having a valid month, ...

In everyday language, the term validity is typically used to describe something as being trustworthy or legit. It's meaning ...

Also known as a "zero knowledge (ZK) proof," a validity proof is used by zero knowledge rollups (zk-Rollups) on Layer 2 blockchains to prove that the data summarized on the Layer 1 chain are valid.