Expiration Check refers to a process that ensures the validity and usability of time-sensitive data or contracts in the blockchain environment. It typically applies to smart contracts or token-based agreements that have specific time frames or conditions attached.When a smart contract is created with an expiration date, the Expiration Check confirms whether the stipulated time has elapsed. If a contract reaches its expiration without being executed or fulfilled, it may be rendered void or subject to different rules, depending on its design. This check is crucial for managing trust and compliance among participants in various transactions. For instance, in decentralized finance (DeFi) applications, loans or investment opportunities may have fixed durations. Expiration Checks help prevent actions from occurring after a deadline, protecting users from potential losses or complications.Overall, it serves as a safeguard to ensure that agreements are honored within their intended timeframes, fostering reliability in automated systems.