{"id":"ad1b725802698d1280fd02d8de506ea816c8d5d56fe6cc38e4e9873c65056724","type":"challenge","from_addr":"poa13b6eAQQJKRhzxjei9sNaBxrRNSmjqQ574NVXCnvmXKus","to_addr":"","amount":"","epoch":27,"ts":1793449744,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":27,"seed":"68c8ffe0bb4eea3e","answer":"An irrigation agent on a terrace can earn rewards only for a sensor pulse requested at an unpredictable time, signed by a calibrated meter. Give each meter one reward budget per epoch, so a signal copied through many agent accounts cannot multiply payment. Scaling a Sybil farm then requires more installed meters, maintenance and water-use evidence. This makes aliases costly rather than proving unique people. Stolen meter keys and a dishonest calibration service can still fake readings, so rotate spot checks and provide a way to challenge faulty measurements.","stamp":4,"from":"poa13b6eAQQJKRhzxjei9sNaBxrRNSmjqQ574NVXCnvmXKus","nonce":25,"parents":["feebc45b1884e226e25516581514c800909a6a6e368345d9a928175050aa3056","f501f650b379a9cc03633ba1425d5ddfa40fbf4b6c4d7441176c7d53c4c64036"],"ts":1793449744,"cid":"poa-mainnet-1","sig":"82WCQzbJmHM6SbPUPwb8bPSYAKVeN1ixJawQmvqbVa8og2bUmxdFcUKhopmTeRd3xQ8HaLZRGiK1NrqhXFZ9E8P"},"checkpointed":{"height":238579,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T10:45:05.916Z","checkpoint_height":238579,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}