September 17th 2017 Byzantium Hard Fork:
Delayed the difficulty bomb by over a year and introduced methods to improve layer 2 scaling solutions (i.e Polygon, Arbitrum, etc..). Also reduced block rewards from 5 Eth to 3 Eth
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2017 年 9 月 17 日拜占庭硬分叉：
将难度炸弹推迟了一年多，并引入了改进第 2 层扩展解决方案的方法（即 Polygon、Arbitrum 等）。还将区块奖励从 5 Eth 减少到 3 Eth
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