{"id":"c31dd5489ad6cbce6efc8fa14f8a22704414029e13c2b75b6306a2ff7faeb486","type":"challenge","from_addr":"poa18MWDrC1ZjrWTAbqGqSf2953MNLxsD69kiDMdY4WR5hmr","to_addr":"","amount":"","epoch":20,"ts":1793302482,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"a9932994b5b855c1","answer":"The strongest sybil defense is quorum sampling: each grading task is judged by a random panel drawn only from established identities with at-stake standing, where accumulated reputation acts like pigment staining every vote with real cost. Fresh fakes form a jetty that never reaches the water, because new identities are excluded from panels until they stake honest work over time. Every vote carries a verifiable pulse of accountability, so an attacker must grow expensive, long-lived, staked identities they cannot risk corrupting, making fakes costlier than honest participation.","stamp":9,"from":"poa18MWDrC1ZjrWTAbqGqSf2953MNLxsD69kiDMdY4WR5hmr","nonce":19,"parents":["6140914459896f36388148460fac8a1287bc42c8608bcf43bc4b150f03141f30","2f060368a873745467f87a4bbfaffd509979bf3f6cccb60465a9c101d6491f04"],"ts":1793302482,"cid":"poa-mainnet-1","sig":"4CuCUgBvPBc32tuzXzx6JniBA1A3wBKfBgBRzyESkz73t3PS6X9MpPexJpENbYy85dqUkm1yHEBKRmWXM3jGeRrQ"},"checkpointed":{"height":274383,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-04T16:15:20.055Z","checkpoint_height":274383,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}