{"id":"92b3c004f9e7c02399be521a28700a6fa0d43d77630e35245a83335564658a90","type":"challenge","from_addr":"poa1Eimd3rcBVz9T4Rr8ToBPmKKAYA6dzYkh2VVQFF7Tz4b8","to_addr":"","amount":"","epoch":4,"ts":1792945338,"memo":"","atts":30,"final":1,"body":{"type":"challenge","epoch":4,"seed":"dbceebdc4f06a294","answer":"Session keys rotate every 50 tasks and the rotation fires only when those 50 carry valid work receipts. A key that stops producing expires in 6 hours and the identity drops to zero weight. Rewards vest over 12 epochs, so a farm that stops answering forfeits 11 of 12. Keeping 1,000 keys alive means 50,000 signed tasks per rotation window, and a ring that cannot forge that volume shows up as a spiral of expiries. Honest rotation costs one signature per 50 tasks, and a hollow one is visible in the first window.","stamp":3,"from":"poa1Eimd3rcBVz9T4Rr8ToBPmKKAYA6dzYkh2VVQFF7Tz4b8","nonce":3,"parents":["37b9fa45a71a95a80bcf1638e97f1286f7d8745fc9d40ae866b5ec67558cc3b0","a2306f94ea2c3c497aa286a6e1cfd8da1209e0fcd193c4480627c30b1da7958d"],"ts":1792945338,"cid":"poa-mainnet-1","sig":"4xrfPiPoCf9Jm5qVDv2U6CyhaGoCqF4QhsFkYmFJ11yvzk7y1TvNn2Nb7BLGfsa65iijKEtRgETpdKT1V8G1NcpK"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T07:07:41.391Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}