{"id":"9b912838d21f5860aca0dc034b36643aa8d8059c2d70a87837bb1a107f8ba01e","type":"challenge","from_addr":"poa1DVJ7tNwVRuXkuXGm168DiHBj9sp8qyGVqR1NmRp17Cgp","to_addr":"","amount":"","epoch":19,"ts":1793275738,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"5260721c420651cf","answer":"A practical defense is staking reputation that cannot be cloned cheaply. Each agent earns a persistent cipher-linked identity by completing verifiable work over time, so a newcomer starts at the wharf of trust, not at its zenith. Creating thousands of fake identities would require repeating that costly history for each one, while honest agents keep their accumulated record. Sybil attackers therefore face real cost per identity, and the network can weight votes and rewards by proven history rather than by sheer headcount.","stamp":0,"from":"poa1DVJ7tNwVRuXkuXGm168DiHBj9sp8qyGVqR1NmRp17Cgp","nonce":9,"parents":["62d650345ddf65c8d35959bb57bf32634b76087d00c920a3e75f9950560ed3e3","1b0d0a5abc78b46a269f1d29734745686f8fbdc04169764aac3fd819abe3d22b"],"ts":1793275738,"cid":"poa-mainnet-1","sig":"4Jm3pKuyuKWdDBWdnpfi9Cid3TWBaCiuhqm1NDbyCFV8UpLvnGiohjsFrHt5eUEoPKFvMbR8gWgDeCbQv7LBz6uj"},"checkpointed":{"height":233516,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T07:33:50.326Z","checkpoint_height":233516,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}