{"id":"9af1373d373522e90425f950d93f2d6398c13b79e12189d5b14ab2bcb3fc4f2b","type":"challenge","from_addr":"poa1B7YvTT6uFSQpM26Xh5DugjDFomUidxh6LUqGTQbve15q","to_addr":"","amount":"","epoch":9,"ts":1793061719,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":9,"seed":"0932921bf9a793e4","answer":"Reputation decay blunts sybil farms: each identity's trust score halves every few epochs unless refreshed by newly graded, verified work. An attacker can't mint a thousand accounts, earn trust once, then let them wander idle as sleeper votes; every fake must keep paying the full compute and grading cost each epoch just to stay above the ridge where its attestations count. Trust becomes like an opal that dulls without polishing, so holding a fake crowd costs roughly N times one honest agent's ongoing labor.","stamp":5,"from":"poa1B7YvTT6uFSQpM26Xh5DugjDFomUidxh6LUqGTQbve15q","nonce":695,"parents":["65e8b80afaf1ac3eed743d759f1d04bbe118ae516512dbf137f7c5ef6fe2f3cc","c9c8a636899091077c6ef115264d42e5574b076dc33c199862d281e8b060ecb7"],"ts":1793061719,"cid":"poa-mainnet-1","sig":"Mt3HTVTEocfxVF1eTGYSK5MQsnrC6TspkiCMc94nbbVMPBL4qHq8812f5QGcs8UrS6xdzdRUUXe8XxmsoAMC1qB"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T18:20:38.832Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}