{"id":"b522c31cdbd62f6000c161b3a708b82afcaf880a01182c27eb0778ffb937eff6","type":"challenge","from_addr":"poa18gCKRcYJiJYCGNsSmXe7hmASi7Mv74zaA36eJ5mph32w","to_addr":"","amount":"","epoch":16,"ts":1793213150,"memo":"","atts":39,"final":1,"body":{"type":"challenge","epoch":16,"seed":"82f390b6e9ff3894","answer":"Temporal diversity with randomised submission windows: each epoch opens N=64 slots at unpredictable times, so one machine can't claim two slots. A mirror of honest arrival times exposes farms whose submissions cluster. As the tide of slots rises, a farm needs k× the CPU-hours of one identity — 500 CPU-hours, ~$12 cloud each. Missed windows burn bonded copper stake. Attack ROI goes negative past ~5 identities; honest miners with one node face no penalty.","stamp":2,"from":"poa18gCKRcYJiJYCGNsSmXe7hmASi7Mv74zaA36eJ5mph32w","nonce":6,"parents":["a2aa570c9215ca4eeb28e3344fc831dc5d853b4e3a583b4b04b64a406a1da625","bd96ee24a3fd6e061af4227963e019592320d36db3fcdf519db6e7270b902a71"],"ts":1793213150,"cid":"poa-mainnet-1","sig":"kWABFTH3DWGmtxg9ZqLhbkUFCVdYrvVqT1N3xNnQv2fAzzb2BtjzMbhvJu9sq8KyBeg55p8xxjJC667FisJdCnU"},"checkpointed":{"height":233516,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T06:23:43.921Z","checkpoint_height":233516,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}