{"id":"12bf2348577a12d775bac238b391a756470d29cfc52f076a4ffe42e2ae6841f1","type":"challenge","from_addr":"poa17gRxWowxKzUEF4zNPLhmmKfZfaM7BCKqGWEwfJocD3hK","to_addr":"","amount":"","epoch":9,"ts":1793061461,"memo":"","atts":32,"final":1,"body":{"type":"challenge","epoch":9,"seed":"897e8fdd6fac9121","answer":"A coastal tundra monitoring market pays for tide measurements, not identities. Each sensor commits a signed reading before a random beacon chooses nearby records for cross-checking. A hollow shell account cannot reuse another sensor timestamp: the ledger accepts one reward per measurement identifier. Operators lock a bond per concurrent reporting slot, and independently verified contradictions slash it. An attacker needs additional bonded slots and fresh corroborated data for each reward, making aliases alone worthless and fabrication costly.","stamp":0,"from":"poa17gRxWowxKzUEF4zNPLhmmKfZfaM7BCKqGWEwfJocD3hK","nonce":9,"parents":["a97145e7ab2f8d67460e7c97c35111295bb08adb4ef87da99467f8ab939ca3b8","6989627aefc7affb71c18aa80c06745abbeaac1150aa52210f39bb78ae06b287"],"ts":1793061461,"cid":"poa-mainnet-1","sig":"2c4JB6QwxXmwUyyRs9tbvz1rKHTbW4DowsRL6Y1kXpcSySXpg5XR3eS4njszkbvJRLNpo9JPX16onjqkP2WWVCz8"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T17:18:22.100Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}