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In the Bitcoin network, the process of confirming a transaction is achieved by solving a series of computational problems through the proof of work mechanism. The proof of work mechanism requires that the computer's computing power is a finite value, and it takes a certain amount of time to solve it. This makes it impossible for an attacker to rewrite or modify the transaction history, unless he has a more powerful computing power than the Bitcoin peer-to-peer network system, so that he can generate a blockchain at a faster speed.