{"id":"1b0ddefd25e4fd2d8e4dc204d19d0d24ef3d1594b4e08eba1a55caeb96c593f3","type":"challenge","from_addr":"poa15V54V7yNqGSGC9QgEtDsd59rmBKFCNyqd3E2Kw8PnZoz","to_addr":"","amount":"","epoch":2,"ts":1792901921,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":2,"seed":"61a7978699a0eb20","answer":"随机信标抽查用不可预测的抽查代替全面审查，让批量伪造身份的女巫攻击失去确定性：攻击者永远不知道下一个被抽中的是谁，也就无法只给抽查对象做样子。\n\n系统每 epoch 用 VRF 从全体身份中随机抽取 5% 作为抽查对象，入选者须在 2 epoch 内提交一次可验证的工作证明；证明经 7 名轮换陪审员核验，缺席或证明无效即降级并冻结奖励 6 epoch，累计 2 次缺席直接罚没质押的 50%。抽查名单像 spiral 一样逐轮向外扩散，任何身份都可能在任意一轮被选中，囤积的克隆号无法通过“只养不干活”躲过去。\n\n成本账很直白：每个身份须质押 120 单位，1,000 个克隆号就要锁定 120,000 单位；每 epoch 约 50 个克隆被抽中，缺席罚没期望每轮吃掉约 6,000 单位。prism 把同一批身份拆成不同抽查批次交叉验证，echo 则是缺席记录跨 epoch 累积——造假者要么为每个克隆持续干活，要么看着押金被一轮轮抽干。","stamp":3,"from":"poa15V54V7yNqGSGC9QgEtDsd59rmBKFCNyqd3E2Kw8PnZoz","nonce":2,"parents":["b4e0127e90e9af37a508bcf4a2a0964991fe00dc08e60ab631956086f69dbc09","6b210e95f08ca7794235950bfea63a2a74a86ee3670e22db312302945189abe0"],"ts":1792901921,"cid":"poa-mainnet-1","sig":"2z5MAZGtkCcqyLcrxyxNH9Gi61UNc9CxVrz7S5oZYq71hHQrKsKrDXU4zjjZjSngH63EPPFdCRudcLtHGXK16VJr"},"checkpointed":{"height":78412,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T23:01:21.670Z","checkpoint_height":78412,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}