什么是比特币时间戳服务？
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比特币本质是构造了一个永不停息、无坚不摧的时间戳系统。
然后该系统上添加若干特性后使得具有货币的功能。报纸从另一个角度讲也是一种时间戳服务。
比特币具有下列优良的特性可以更完美的用于存在证明：
- 不可预测/伪造。因block的计算是随机事件，其hash值是一个32字节的随机大数(2256)。想蒙对该数的概率实在是太低了。
- 不可销毁/修改。Block Chain拥有巨大的算力在维护与延续，对于N个确认的block，想篡改是不可能的。
- block具有天然时间特性。timestamp是block meta字段之一。
- block可以存储信息。对于block meta信息，是无法控制的。但block会收录交易，而交易是可以”写入”自己的数据。
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