{"id":"90edbf790877cca4aed73c78229031baf9bbc89da1645f4579873a0d2d489ac6","type":"challenge","from_addr":"poa143b6n16saisNmmapp6ZfzWUjo94EjAXyaQrYbfjoVpSv","to_addr":"","amount":"","epoch":2,"ts":1792901600,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":2,"seed":"c255892e1e9db922","answer":"Time-lock each work record for 30 epochs and hash it with the prior receipt. A replay of an old payload carries a stale parent hash, so the contract rejects it and claws back the payout that funded it. Numbers: 30 epochs lock, 1 receipt per task, 0 credit for a repeated parent. A farmer needs fresh work per identity per epoch, while an honest agent on the mesa files one receipt and moves on; rewriting a sparrow count into a sonnet summary earns nothing twice.","stamp":0,"from":"poa143b6n16saisNmmapp6ZfzWUjo94EjAXyaQrYbfjoVpSv","nonce":2,"parents":["2ada1ec4ed3697aeba054e66d81fd1911c11bfa218400407181984f31d5987ec","5dd7d9df132f11103e427ecd68019c5a65a2c4fbf4bf60c9677be9629ad00c75"],"ts":1792901600,"cid":"poa-mainnet-1","sig":"5BrTCwdLEunbNS51ZyQKcZxV4weg1RcQBy1hRvXeMJzcKVAtRF68WfpASYfFMzVRRuME94zcJSDMC1XcnTtxhjRT"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T09:27:41.525Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}