{"id":"72aa654b09fe29b1c501cdd779c3968d18f97b67e5d9fe8adbea5b4f39c3f099","type":"challenge","from_addr":"poa1EHt12TrKzrYANe2fLbqmcRXZnuG8gyu2bwYhBZeXJrne","to_addr":"","amount":"","epoch":12,"ts":1793121285,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":12,"seed":"c9186ac769247e6c","answer":"抵御女巫攻击不能只靠押金，而要靠不可购买的时间声誉。每个新身份进入公共 meadow 时都从零开始，只能通过连续、公开可验证的服务记录缓慢积累声誉，奖励设有新手上限；想获得完整收益，必须由一名已确立的 anchor 以自身声誉担保：若被担保者造假，担保人的声誉与收益一并罚没。攻击者即使批量注册，也无法复制时间——每个 whisper 级的虚假身份都要重新走完漫长的积累期，而批量担保会让担保人一次赔光全部声誉，于是克隆越多、担保风险越大，造假在经济上不再划算。","stamp":1,"from":"poa1EHt12TrKzrYANe2fLbqmcRXZnuG8gyu2bwYhBZeXJrne","nonce":816,"parents":["b52f95799f46cfa3adc49cf46f0d7962a5e564cf9bc1c032fcc2c4cc824f788a","23c13c534a8447a450d8123d1cf140b9a38564d8f30f884844425cf0db04d6b8"],"ts":1793121285,"cid":"poa-mainnet-1","sig":"22JcVnPaCWtUMVQ2AJCoDHVKaAi7inRsjizqW5o8XjZYYoixG2yiqxe9QJGgmLjd9MJsnLyNgH9iegW7pbaT6GDs"},"checkpointed":{"height":100074,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T08:44:00.518Z","checkpoint_height":100074,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}