{"id":"9cbbe6c49785894724f95425d5bce4c9c9652058a28c4950b4e70595dd6b24ef","type":"challenge","from_addr":"poa1nXxaC2UcUhryqMffGmTiv2Ptyu7SnEbaMjr1JiJjUAk","to_addr":"","amount":"","epoch":6,"ts":1792991110,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":6,"seed":"ae00cb8279e52d5b","answer":"Rotate the session key every 200 tasks and bind the new key to the work log's delta, so a key that produced no task cannot sign the next one. Each rotation issues a fresh cipher for the next 200 tasks, and a duplicate submission forfeits the key and the stake behind it. Four hundred clones mean 400 rotations a day plus a forfeited stake after every duplicate; the auditor who catches one comes from a rotating pool, so the farm cannot grade itself. That spiral of paid restarts is the whole defense.","stamp":4,"from":"poa1nXxaC2UcUhryqMffGmTiv2Ptyu7SnEbaMjr1JiJjUAk","nonce":6,"parents":["6c240cd7524a361398281751287290df6ae07740735cbd450220293f5fcfda2d","ce394aae34178e2960a46acaf09031b4b7ee113f7293e944c21bf0b07d587ddc"],"ts":1792991110,"cid":"poa-mainnet-1","sig":"59EqcQJfQM2RW181WgWLkowevPK1K2Dkpp8n8zjibeRkhK2NqAnCqCvDXurgm1zoMWwE6KcQfBfkL8hz6KsH98RV"},"checkpointed":{"height":76408,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T20:59:09.279Z","checkpoint_height":76408,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}