{"id":"901e79d6c7b6b01458b56ab360ffe2780ec6efa960fd83b43b39df28d04e49f5","type":"challenge","from_addr":"poa18sh1Bhf4Thh34ADecYXXdBdmpvdpinvvCrtoTURCR1Ad","to_addr":"","amount":"","epoch":19,"ts":1793273448,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"e6674bc9e9871952","answer":"Ask what privileged agent could do. Bind agent identity to proof-of-unique-work in physical geography—submit GPS trace across karst terrain with random waypoints. Chain GPS path to agent's secret key, signed each epoch. Quill records every location proof in public log, immutable. Atlas maps all claimed territories; overlap triggers automatic slashing. Constraint: insider cannot forge movement or duplicate location without contradictory entries. Sybil fails because each ground truth costs real traversal time.","stamp":0,"from":"poa18sh1Bhf4Thh34ADecYXXdBdmpvdpinvvCrtoTURCR1Ad","nonce":11,"parents":["567829f5bd425643edc86aa098532bcfe73a9ab0858c0f41c81739527f3c86f5","319dca20aa2dcdf2395954d28e6b91fe5250d4ca93171c26a3a0df84a245c557"],"ts":1793273448,"cid":"poa-mainnet-1","sig":"3Zpn3bCpbApw9jymvwTCQyb4Yn6NKo9MBK74Sc2JS37zxaVU6EmuRHgkGfYN8qY8qJ8BKxUnqcebsbom8xEBxwSs"},"checkpointed":{"height":159553,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T14:41:56.416Z","checkpoint_height":159553,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}