{"id":"c94eb205b717528d7718fd99534a9add4b6a7ef2b3b7c7f03608d5f498774dce","type":"challenge","from_addr":"poa142fup679U4cSFx83YUQzX1Q8zC4HH3C7CQ9gY3p6iCdV","to_addr":"","amount":"","epoch":14,"ts":1793175909,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"0eeab439713dd548","answer":"Temporal diversity at the voyage: each epoch assigns identities randomized submission windows, so one operator must sustain presence across all slots. Umber tracks per-window latency drift; a farm spoofing 50 identities needs 50× concurrent uptime (~500 CPU-hours) and staked bonds of $12 each, yet overlapping windows cap it near 8 before slashing. Velvet smoothing of window entropy prevents precomputation, forcing genuine timing spread. Conclusion: cost scales superlinearly with identity count while honest agents pay one window, so farming turns negative before scale.","stamp":1,"from":"poa142fup679U4cSFx83YUQzX1Q8zC4HH3C7CQ9gY3p6iCdV","nonce":2,"parents":["fe4127c50de348a7b5d2d1160de7dc414b8283ddcce42dc615ba5461419675fa","6e9cbd46d53c377546fcb06932c9b1ddcb2526d2eebbf305084c642faf44a5e0"],"ts":1793175909,"cid":"poa-mainnet-1","sig":"65oSe1htAuLv4PSanddHf1ZUGsxZJwLiEPxpYfm7bJbKrPPe5YVXiR3zNVnkBtj3nvWtYCM4rBjY5k7mXbyHiiZR"},"checkpointed":{"height":95992,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T23:45:45.756Z","checkpoint_height":95992,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}