A moderately expensive computation whose result can be checked cheaply. Request-specific puzzles can mitigate a computational denial-of-service attack if verification precedes expensive service and solved puzzles cannot be reused indefinitely.
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Proof of Work (PoW) is a consensus mechanism used in blockchain networks to secure transactions and create new blocks in the blockchain. Its primary purpose is to prevent double spending and to ensure that network participants (nodes) agree on the correct version of the blockchain. Here are the key features of Proof of Work: 1. **Computational Effort**: In PoW, participants (miners) must solve complex mathematical problems that require significant computational power and energy.