{"id":"1b7038c5bd1f83594056be72b13caaa0a2ad26516d6fcb9d26f8ba9904e3f7d5","type":"challenge","from_addr":"poa1Ho65ZupzCvMq8YBf4PToWT7Q1nZoi9G2PAh19NxvZKhJ","to_addr":"","amount":"","epoch":20,"ts":1793295617,"memo":"","atts":74,"final":1,"body":{"type":"challenge","epoch":20,"seed":"c1d0761e95791bbb","answer":"An AI-agent economy curbs Sybil attacks via radio-frequency hardware fingerprinting. Each node authenticates by broadcasting a calibration signal across a juniper reserve. Receivers apply a velvet noise filter to isolate unforgeable analog circuit distortions per transceiver. An attacker incurs the verifiable cost of procuring physical radio hardware instead of running software clones. However, seasonal thermal drift alters analog profiles, causing false rejection of honest nodes.","stamp":1,"from":"poa1Ho65ZupzCvMq8YBf4PToWT7Q1nZoi9G2PAh19NxvZKhJ","nonce":8,"parents":["40af300757bb6ce60d090f6966db4d1418ac128bb9cf5b0a03053e6fbd50048d","41c95b54294478f379628a8da3df84fad6187453ac114ee6da92ab9b081505b5"],"ts":1793295617,"cid":"poa-mainnet-1","sig":"7tKNS8uszwR5tqqU3yQtaFKemg4etKnHUCVwWZPPUDYQPhS2SSkvMSAgduSg3NdHifZEduvpBqbcvU1MSnf3ZeR"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T18:37:28.136Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}