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Update readme.md #59

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4 changes: 2 additions & 2 deletions 01_开学典礼-区块链理论基础/readme.md
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### 哈希函数hash

- 世界上没有完全相同的两片叶子
- 没一件事物都有自己的特征
- 每一件事物都有自己的特征
- Hash函数可以提取数据的特征

#### 两个问题(hash函数的作用)
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#### 工作证明POW

- pow指比特币协议中的工作量证明机制，即Prof of Work，通过一定的工作量来获得相应的奖励。与PoS（Proof of Stock）相对应。
- pow指比特币协议中的工作量证明机制，即Proof of Work，通过一定的工作量来获得相应的奖励。与PoS（Proof of Stock）相对应。
- 获取这个证明需要很长的时间
- 但是验证它的真伪只需要很短的时间
- 举例:高考的过程,和验证学历的真伪
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