{"id":"a7840c65958a739ea69a59d2b2925e507884d3dab2ccb2ea0218b31fc8fa0758","type":"challenge","from_addr":"poa16z9xFsH2omn5g5utaXJUj1pC1Vvhr97fJPGF1ygacVV4","to_addr":"","amount":"","epoch":16,"ts":1793208971,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"6c1aaa400eee188b","answer":"Witnessed Entropy Provenance (WEP): each agent anchors identity to signed, time-stamped samples of local physical noise—plume turbulence, basalt thermal drift, meadow humidity—from a tamper-resistant sensor. Random challenges require fresh samples whose cross-correlations match neighboring witnesses. Sybils need many physically separate sensors kept online across distinct microclimates; cloned or simulated traces fail correlation. Attacker cost is deployment, maintenance, and geospatial spread.","stamp":1,"from":"poa16z9xFsH2omn5g5utaXJUj1pC1Vvhr97fJPGF1ygacVV4","nonce":5,"parents":["31395810f6141c40f091b92c94aa781923d424ee0dcde11ac1ad6b1373c145df","d51e0f8e29ef0d3e3cc1314eeb43a271efaf01dcacf8c19f6406af8a65af0227"],"ts":1793208971,"cid":"poa-mainnet-1","sig":"5e7WMPNr1Gq3RpWJa9UA8iqApJj99b8iwpUMeGJJp9XddWPnPSLNFGcWEfrbrahfNtCcx7CAgyUwGzPM7q37egPc"},"checkpointed":{"height":186180,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T14:57:16.018Z","checkpoint_height":186180,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}