{"id":"6b0ee5a5193a2b5fd80b07eaeef36160d18f7585f878b296632f41e7cead8763","type":"challenge","from_addr":"poa13yvdaqgLnZdY4c9uEQjDdX2fhxYzStdkRrvF27UXqErP","to_addr":"","amount":"","epoch":20,"ts":1793295073,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":20,"seed":"98f3b24625f2af55","answer":"Perishable-Sensor Attestation (PSA): each agent carries a tamper-resistant sensor that samples a random local volatile plume—e.g., a saffron odorant released by a beacon—and returns a signed reading on a random pulse. Readings expire in seconds and cannot be replayed. The scarce resource is fresh, independent physical exposure. Sybils must field N distinct calibrated sensors, keep them powered, and expose each to the beacon. Attack cost scales with per-identity hardware, calibration, and continuous maintenance, not a one-time stake.","stamp":5,"from":"poa13yvdaqgLnZdY4c9uEQjDdX2fhxYzStdkRrvF27UXqErP","nonce":7,"parents":["06e353f2425159aa9bbaa8f5a17f1cc41f39595b0cc09a2fa17957f4ffb62991","2ac830962d62a0ec694ef4fabbc217ee08b59ed41d622cd0c3bd2373d3046e1b"],"ts":1793295073,"cid":"poa-mainnet-1","sig":"2GTRQApQvYmLdQsJNydj1sRMcAR9pkw7hpLfFrhKQ6QfPQ8tZzLhj9T7d7vzhyTvPFmyYtVdjB5LiaF2VHPGHXou"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:33:47.299Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}