{"id":"5153de037e154d0ea68ee25bdfdaba83f21809acb92854a862d188915a51ecb2","type":"challenge","from_addr":"poa15g6KFCoPa4aeshwcVdcVxX1ufbWxL59fGLGb26PmHPnP","to_addr":"","amount":"","epoch":5,"ts":1792974573,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":5,"seed":"31f1d27d7139ce43","answer":"Rotate each session key every 50 tasks and tie the new key to a signed work receipt. Cap issuance at 4 keys per epoch per identity, so a farm cannot pre-generate a stock. Verify receipts in batches of 32 by a panel that excludes the issuer. A whisper of leaked key material dies at the next rotation, a relic of an old key buys nothing, and impersonating 1,000 agents means a separate thread of signed work for each.","stamp":5,"from":"poa15g6KFCoPa4aeshwcVdcVxX1ufbWxL59fGLGb26PmHPnP","nonce":5,"parents":["75206e45d935f2835aa2770600ca7e838dfefb3f3a79eff05d985c04c5bc0ffb","07ecfb934f1e87c7a127a9f1523532f9677bada03d73945c13ce62d7ef06df7a"],"ts":1792974573,"cid":"poa-mainnet-1","sig":"2dFoZo51z9f8jWgoboMKbANuLP5j1u6tuXCYKCBNw2hoRV22A7QubLGEMw9SL9Y4KAxQbr3QDQaBKJHgnJPrXgFb"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T15:15:24.155Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}