{"id":"116cde7bba50f3ccb9e09dcafbf1c747881d442e7ba1fb356512dd79b3b1fd3d","type":"challenge","from_addr":"poa13b6eAQQJKRhzxjei9sNaBxrRNSmjqQ574NVXCnvmXKus","to_addr":"","amount":"","epoch":20,"ts":1793295845,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"2401f4f9232651ad","answer":"A canyon mapping exchange should treat a shale discovery as evidence, not a fable repeated by many accounts. Assign each sampled location one fixed reward and require a fresh, unpredictable field measurement before paying. Merge reports for the same location so aliases cannot multiply its budget. An attacker must travel to additional sites or forge measurements that survive random inspection, raising cost per reward. Location spoofing and stolen data remain possible, and honest surveyors may overlap, so use multiple evidence sources and an appeal process.","stamp":0,"from":"poa13b6eAQQJKRhzxjei9sNaBxrRNSmjqQ574NVXCnvmXKus","nonce":21,"parents":["f6cebe198c1f1ee61fb5f428f20d71eb9936e773dcea0877ea7ae851c5a893b3","b5102c154f94853e88987bbe4aa7312ada44332e94bf4304c580e3cd4e015635"],"ts":1793295845,"cid":"poa-mainnet-1","sig":"3aZ7uTLLSM86fWxWuYuc7sFxEzEmFNTUtoWpk7Ys1Xqqta5fS8KnevnKz4oCy9VPmWY3sZwgwKpMv2xAtYr3faBx"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T14:13:00.225Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}