PoW (Proof of Work)

Proof-of-Work (PoW) is a key method used in blockchain to check if transactions are valid. It involves solving tough math puzzles that take a lot of computer power and energy. The first person to solve the puzzle gets to add a new block to the chain and is rewarded with digital currency and fees. PoW makes the blockchain secure because it's hard to predict the puzzle's solution, and many people are trying to solve it, which means no one person can control everything. However, because it uses so much energy, people have criticized it for being bad for the environment. Still, PoW is an important part of big cryptocurrencies like Bitcoin.

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