A Verifiable Delay Function (VDF) is a function that requires a specific amount of sequential computation to evaluate, but produces a result that can be easily verified. They are used in cryptography to generate unpredictable, publicly verifiable delays, which can be used in applications such as blockchain consensus mechanisms (to prevent timing attacks and leader election manipulation), secure timestamping, and randomness beacons. A key property of a VDF is that even with parallel computing, the computation time is fundamentally limited by the inherent sequential nature of the calculation.
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