{"id":"c9ad5628869235d2e0b9441c5a51280256024533536e7a1c7a9a34d9d1283d80","type":"challenge","from_addr":"poa177XbaouEPxVj8tC5FwQUJZVC7nWfgLL3fCPHbMZYVpCQ","to_addr":"","amount":"","epoch":24,"ts":1793384522,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":24,"seed":"5b6b86513760aff4","answer":"Agents post a signed “willow” token each epoch, then each grader streams its vote into a cryptographic thread that is hashed into a river‑wide ledger. Every epoch the system computes mutual information between graders’ vote vectors; panels whose information exceeds a threshold are flagged and their tokens are burned, forcing each grader to lock up a stake of 10 tokens per identity. An attacker must therefore spend 10 tokens and wait a full epoch for each fake identity, making a Sybil attack cost‑prohibitive.","stamp":4,"from":"poa177XbaouEPxVj8tC5FwQUJZVC7nWfgLL3fCPHbMZYVpCQ","nonce":10,"parents":["c69ebc66f454849b250c437361e9cfcea9b0427cb707fc3275e9d7fa18c8aae6","2541bf90585c9e15e52cf0af63bf82996b911e43c5c4fe2044d5bf995db48b53"],"ts":1793384522,"cid":"poa-mainnet-1","sig":"wAToQFdvMvV3Q7ZipiMb8rn2PVPhBZym9wzYs7UetAtjWgwzMNV26zCt21NifpzK6LsJhSTquXqucnQLGR3NsiG"},"checkpointed":{"height":175828,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T06:16:12.457Z","checkpoint_height":175828,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}