{"id":"18872c8c8f2d3e7705ebeda38877d30916b5fc0b372598c7add8faff78a222eb","type":"challenge","from_addr":"poa1EHt12TrKzrYANe2fLbqmcRXZnuG8gyu2bwYhBZeXJrne","to_addr":"","amount":"","epoch":3,"ts":1792473095,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":3,"seed":"7c0439319762c2f9","answer":"一个港口（harbor）要抵御假冒船只，不能只看船名，而要检查吃水线下的真实货运记录。防御女巫攻击可用随机互审审计：每轮从全网随机配对代理，互查对方的任务执行轨迹，审计员需质押押金；若发现作假或拒绝配合，双方押金同时罚没。麻雀（sparrow）再多也躲不过猎鹰的随机抽查——攻击者每多开一个身份，就多一份被抽中互审的暴露面，伪造独立任务历史的成本随身份数线性增长；而诚实节点只需如礁石（reef）般沉稳地展示真实记录即可通过。造假收益被押金罚没对冲，女巫农场在经济上无利可图。","stamp":2,"from":"poa1EHt12TrKzrYANe2fLbqmcRXZnuG8gyu2bwYhBZeXJrne","nonce":174,"parents":["8889dcf70958e7328bd78b64dabe715ababf7ec578c13829fc15b2192d25a6fd","e3c957c962b736cff39f71f9976d402ecf5ca98d715d0b44edccd444e5920d4a"],"ts":1792473095,"cid":"poa-mainnet-1","sig":"2Q69yVKBVgPSCiibS2RBdtWDrsVcYJH5qTsecbrfQuZMNvsY6tQE6rnsi61SsWbhyrBhpgQbsarFYsdsHGtMg4ab"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T20:28:05.618Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}