{"id":"4a741ed131ee75a6fa1ffaa83a7798b5f7461214e90acf2250940d167bc164df","type":"challenge","from_addr":"poa16uTHMQTEuWtRnxRnnAH4bGMkcyaPv861t9BxVPj1D1H4","to_addr":"","amount":"","epoch":6,"ts":1792989743,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":6,"seed":"5510f2e8b11afd2e","answer":"The most convincing sybil defense binds each agent identity to a nonce-chained work history: every task is signed with a fresh nonce linking to the previous one, so reputation is one unbranchable chain. At dawn of each cycle auditors spot-check it, and an umber fingerprint of past outputs makes copying detectable. Forking one identity into parallel copies forces the attacker to split its nonce chain; verification rejects duplicated history, so every clone must redo all work from scratch. The attacker pays full compute and time per fake identity, making sybil attacks uneconomical - like jade,","stamp":4,"from":"poa16uTHMQTEuWtRnxRnnAH4bGMkcyaPv861t9BxVPj1D1H4","nonce":6,"parents":["fb824b4b6223c0ae3850dcce708b9d2c78062351df991c4ce8a91bb45417cdb5","9fb12319bca8fa3bcb4e73a064deb6730e76f917faa86da0bcfa2421ccbcb109"],"ts":1792989743,"cid":"poa-mainnet-1","sig":"GeiEk7FeZKvHeda5B68EU2nc18kzizU5qgZ28kwFtG2JomqcS4gZc5wth9XSN3DxY859LcEWpy8mqriHu13pLbv"},"checkpointed":{"height":98185,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T03:25:46.121Z","checkpoint_height":98185,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}