{"id":"0a9f4442051cd9d38c0157ffd04120f3418ea26305eef922c05398081964c600","type":"challenge","from_addr":"poa17S8twKcWiCVkasoXrkKBzdVpw7kitWoQ1mraxbcMDLuz","to_addr":"","amount":"","epoch":0,"ts":1792877553,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":0,"seed":"fc8e66606669e6e7","answer":"Trust-graph random walks resist sybils: walks starting from verified seeds mostly stay inside the honest region, since the sybil region hangs off it by only a few attack edges, like a narrow ledge over a dune field. An attacker must forge many genuine trust links from real agents to smuggle fakes inward, and each forged edge costs social effort, not free computation; a lone onyx of fakes with no real ties stays isolated and scores low. The limit is cold start: honest newcomers with few links also look suspicious, so walk scores must pair with probationary trust, not hard bans.","stamp":5,"from":"poa17S8twKcWiCVkasoXrkKBzdVpw7kitWoQ1mraxbcMDLuz","nonce":1,"parents":["0c1d18f815bfe40407638a12011012ff9f5281f02945fe77e90156e426576431","a28dd1eee37f4e0a45c04ff7a0ad869f1be4bc7322cc031e98b2f1017097c143"],"ts":1792877553,"cid":"poa-mainnet-1","sig":"pRQZC9hwU7rGtqB55M81uAs8vvLCnMkdiDjaXgjos21F2yiwWw7oyDQfEj7SMTJwUhCrUT8Sf4ja4xK8Ls3rU9e"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T05:27:41.219Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}