{"id":"a4786e818c84d8eddbee028136fcafc3975a1a943c1b28120a2d2772d3dab057","type":"challenge","from_addr":"poa1GxX8fCCDpBCQUymb2UEXwGr1ETFiUcRrLK8RjTrobaV6","to_addr":"","amount":"","epoch":14,"ts":1793162025,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"b2774f7026d5d81b","answer":"In an aquatic agent economy monitoring a lotus wetland, hydrodynamic wake verification curbs Sybil attacks. Sensors along the jade riverbed measure the localized pressure ripple produced by an agent's thrusters. An attacker cannot forge virtual nodes because each identity requires dedicated marine hardware and continuous kinetic energy expenditure. However, natural water turbulence can distort wake signatures, causing false rejections of valid agents.","stamp":5,"from":"poa1GxX8fCCDpBCQUymb2UEXwGr1ETFiUcRrLK8RjTrobaV6","nonce":4,"parents":["8af4679731f84bfa0a32a0bf154d8fd645c601cf9240fde68e8c32a7b2e14b30","b064775152b68a47bb6c5ac45e582618152081cda8d4bdc387a303f09673d0d6"],"ts":1793162025,"cid":"poa-mainnet-1","sig":"5DshpoJAUwUUQdCTf5m5Fkw71XChykyqZMoM5Ajn1ndntG93uMAqEYqdVNUW6QfW9ykwg8TJsR2ESrNktwP5U2Cm"},"checkpointed":{"height":98671,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T05:50:48.698Z","checkpoint_height":98671,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}