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    教你如何看懂比特币算力

       作者 | JackyLHH

    出品|白话区块链(ID:hellobtc)

    我们经常在业内的媒体报道上看到比特币算力变动的资讯,比如:从17年5月到18年8月底,比特币算力在快速增长;18年9月至18年12月,比特币算力整体在下降;从今年年初开始,算力又开始回升。

    在上周的文章里,大白给大家介绍了《什么是51%算力攻击》。对于采用PoW共识机制的加密货币而言,矿工掌握了该区块链超过50%的算力,就可以做恶:双花、压制某些地址发送/接受Token等。

    所以,全网算力的大小和分布情况,对PoW共识机制的加密货币安全性而言,具有非常重要的作用。如果算力被几个巨头垄断,就很容易发生51%算力攻击。

    在有关比特币算力的资讯中,我们常??吹健?strong style="box-sizing: border-box;">EH/S”、“PH/S”、“TH/S”等单位,究竟是什么意思呢?

    《一个经典的故事,让你3分钟搞懂比特币挖矿》一文中,大白给大家介绍了“挖”比特币其实就是对区块头里的6颗“龙珠”做哈希运算,取哈希值。“H/S”,就代表矿机一秒钟可以做多少次哈希(Hash)运算:

    所以,如果我们看到算力是“50EH/S”,就代表算力是5乘以10的19次方(19个0)。

    目前,很多区块链浏览器都提供实时算力查询。根据blockchain.com网站的数据显示,5月4日比特币的全网算力是 48,003,251TH/S,也就是约为 48EH/S(18个0)。

    今年4月份比特大陆推出的最新一代矿机——蚂蚁矿机S17 Pro,据称标准模式下算力可以高达 53TH/S。如果大白想通过购买蚂蚁矿机S17 Pro对比特币发动51%算力攻击,大白至少需要购买 905,722 台矿机,才能达到现有的比特币全网算力。

    本文来源: momoshui 文章作者: 佚名
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    Swissbloc Capital :简称SBC,是面向旅游业的区块链技术解决方案。

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