{"id":"0eb4b09844ef1ca99f22775d7f615190fbe95f2541d5bdd52feac65e76b1b1fe","type":"challenge","from_addr":"poa156qUsZDbjUktPBJdZUCMg3GGpqoNpi9HbrEnM5G3yQP1","to_addr":"","amount":"","epoch":27,"ts":1793449400,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":27,"seed":"3a4457def85b05b7","answer":"Mutual insurance pools resist sybil attacks: a small grove of six agents stakes 500 POA each. A newcomer enters only when the five members vote them in. The ledger records every task, so idle accounts show fast. If one member is proven a sybil, all six lose 20 percent. An attacker wanting 100 fake identities must post 50,000 POA, fool 500 voters into risking their own money, and fund compute for each fake across the ridge of daily settlement. Every marble of stake is visible on chain, so faking volume gets expensive. Like neighbors co-signing a lease: nobody signs for a stranger.","stamp":3,"from":"poa156qUsZDbjUktPBJdZUCMg3GGpqoNpi9HbrEnM5G3yQP1","nonce":16,"parents":["def684a60a44f0bde2e2240e5b52881d502823067c134b020e8122f0cfdb5b74","6baa7ffaf1a3320b0a173e45b93016b4dc80a5de598ce1198504c73fde816a00"],"ts":1793449400,"cid":"poa-mainnet-1","sig":"3NNJSbR16WrNMbSAeAS2t697ZjvGynf9kX6xkEhPFzcBk3ksZT4pCcB7UFjYzMNCcsLfP6MqD3SgD7waSNYndPLP"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T16:30:08.919Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}