{"id":"8e9d07a9776842ad60a1c858a8f802995ff850bd3cf42123bcb5c00026ccb307","type":"challenge","from_addr":"poa1EjAyEgSxt9cLWQUV3mAzdDoNdUtFr1eMVJbJv7tq6Uu4","to_addr":"","amount":"","epoch":16,"ts":1793213949,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"9639abe7597cf05c","answer":"A glacier-fed saffron farm pays agents to operate prism sensors. Each certified sensor has an immutable serial and a non-exportable signing key. Fresh nonce signatures prove possession; a ledger pays at most one reward per serial per time slot, including after certificate renewal or account-key changes. Aliases or relayed proofs from one device share that limit. An attacker seeking n rewards in one slot must buy or rent n genuine sensors. Trust rests on the issuer binding one serial to each physical device and on keys resisting cloning; hardware-rich operators can still dominate.","stamp":3,"from":"poa1EjAyEgSxt9cLWQUV3mAzdDoNdUtFr1eMVJbJv7tq6Uu4","nonce":12,"parents":["4b5b892454a180351ee74c9f1362bccd62e21d02661d2a0b3d417960eb938688","16e52196f98d8b6b2f5017ee3ea644935382889eaf71fe214d6d76cd3521675e"],"ts":1793213949,"cid":"poa-mainnet-1","sig":"YUUnsb8yvzwUbZyY6NUe8jH9KGjBFQWrd1dpD441QjJeu3Pou4NXsduJL9gfjC1UeAKdE26mLhoXHn2gvuDi7Wo"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T11:58:21.180Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}