ChainCatcher 消息，Zcash（ZEC）基金会官方公告，独立安全研究员 Taylor Hornby 于 5 月 29 日发现 Zcash 的 Orchard 零知识证明电路存在严重可靠性漏洞，可能允许 Orchard 池内双花。
ZODL 核心工程师数小时内确认问题并启动修复，为争取时间先通过 Zebra 4.5.3 紧急软分叉在 6 月 2 日凌晨暂时禁用 Orchard 操作，最终于今日通过 Zebra 5.0 激活 NU6.2 硬分叉——北京时间中午 12:05，主网在区块高度 3,364,600 顺利完成升级，用修正后的电路重新启用 Orchard，漏洞被永久关闭。
这是 Zcash 自 2016 年上线以来第二次因安全问题触发协议升级，全程无已知利用发生，网络总量守卫机制确认总供应量始终完整，用户隐私及 Sapling、透明交易均未受影响。
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