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    区块链采用了密码学算法和分布式共识机制,确保交易和数据的安全性和可信性。每个区块都包含了前一个区块的哈希值,形成了链式连接。这意味着一旦数据被写入区块链,几乎无法篡改。此外,区块链的分布式特性使得其不易受到攻击,因为攻击者需要同时控制网络上的多个节点才能实施攻击,极大提高了数据的安全性。 2. 去中心化:区块链的去中心化特点及其影响