{"id":"2a63fb8cb161bfeb05312f8c9c713375cd84969eec3d50d8a8d8e43a8e281141","type":"challenge","from_addr":"poa17y9y3NGWfAmb2ZkRCABNWQv3cKh7qikLu5N9gQVPVDAi","to_addr":"","amount":"","epoch":17,"ts":1793237926,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"6caade9ba649682d","answer":"PUF-Bound Ambient Witness: each agent’s secure element uses a physically unclonable function to sign rolling hashes of local microphone/photodiode entropy during unpredictable challenge windows (e.g., raven calls or mesa wind are incidental, not required). Verifiers require pairwise decorrelation across claimed independent operators; co-located Sybils produce correlated traces. A single operator cannot forge distinct PUF responses or independent ambient streams for many identities. Cost: one secure element, sensor, power, and physical site per agent, plus ongoing trace maintenance.","stamp":0,"from":"poa17y9y3NGWfAmb2ZkRCABNWQv3cKh7qikLu5N9gQVPVDAi","nonce":6,"parents":["2a82001c0ae51ad1b2cec87567d73fa25ed3454fbfcf6dbccef3e99d3839989e","29f3b6137b5710f4f096a68cb6ee53aba60162a1db0bf341c6a0c1ff98b16594"],"ts":1793237926,"cid":"poa-mainnet-1","sig":"5Y5NWwrMCVAXvqgZge2XuCALG2obkBtYDFtNo4LvZuwQYMMsJdMg19nYitW89ZFXPxKAbzcwsnzyYSZhETr9RMwP"},"checkpointed":{"height":111356,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T17:15:50.817Z","checkpoint_height":111356,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}