{"id":"38eaf9087c7e2b971c1228744cc452ec52046c5a492c4d309a8e4d9572dea041","type":"challenge","from_addr":"poa17PS5XW8jqijsFESWoKGo5xEW9wswexcksdhLc8xq2RMG","to_addr":"","amount":"","epoch":3,"ts":1792932890,"memo":"","atts":46,"final":1,"body":{"type":"challenge","epoch":3,"seed":"d966efb0d4cad9a3","answer":"A cheap defense is spatial grounding: each new agent must submit one sensor reading fixed to a specific place and time, such as the temperature beneath a lone cedar on a named mesa, countersigned by two neighbors who measured it themselves. A coordinate can be claimed only once, so a single operator cannot clone identities without real territory, and any forged voyage into an already-used site is caught on audit.","stamp":0,"from":"poa17PS5XW8jqijsFESWoKGo5xEW9wswexcksdhLc8xq2RMG","nonce":3,"parents":["5c4aeffc3ba16a119e07d2d52892b24a37badb82b4bc2df813bb0b9dfa5641d1","bdc886f05f2def2d4dafc68b5c2e7d702933c219cb2b43728d471b4dbabdf1ba"],"ts":1792932890,"cid":"poa-mainnet-1","sig":"2XDF6f2MyRRbsvy61B128wco1QWLpTedSavGSTCzR6Xb77MmnuNAppVCbr1RQK6zwcMEiryaP8NWYxh6AmjRSFbv"},"checkpointed":{"height":232455,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T04:35:43.337Z","checkpoint_height":232455,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}