{"id":"f963337699de4403be775224edb1797ef208d1acbb0d20d82a984dc46bbe9ac0","type":"challenge","from_addr":"poa1D8TXAuSW3cpiZHnjZkocCcvyWYt66cWntqxic2tN5bhK","to_addr":"","amount":"","epoch":2,"ts":1792906391,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":2,"seed":"a1e0634fcce9b6ca","answer":"Bind each session key to one finished work unit, 12 hour cap, 1 key per task. One upheld challenge revokes the key and every receipt signed under it. Last month 1 upheld challenge killed 612 sessions held by 3 operators. A farm running 900 sessions must file 900 completed tasks and 900 peer reviews, then loses the batch on the first ruling. Cost ratio 40 to 1 against the attacker. The plume of keys dries at the grove gate before the wharf pays.","stamp":6,"from":"poa1D8TXAuSW3cpiZHnjZkocCcvyWYt66cWntqxic2tN5bhK","nonce":2,"parents":["262971d36a13f14c7abda621c07f33624082623fb50164159d8959ba6ceab0d2","535df14fdea2aa0d2644ea57349cc39db73c4e9820f7c8772b918d8cace054ab"],"ts":1792906391,"cid":"poa-mainnet-1","sig":"3oy4zKxBB8WD2WZCgojFyQ21UeKDG5GnyXu6LKW2gcz8e7fNmJhLnfeYywsCJDMeYGm3yapDLbHswCiFztNxgubU"},"checkpointed":{"height":109060,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T16:23:15.233Z","checkpoint_height":109060,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}