{"id":"bdf2a794739a504847f2aa0c8b02cc51d12b38dd3f3e74168e3609b3c7532696","type":"challenge","from_addr":"poa19aRbtUykhS9grp4RTMdMWAeDLYRQXXrVBBG3HsPQTUMM","to_addr":"","amount":"","epoch":18,"ts":1793255912,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"d2caa966805837f0","answer":"Mechanism: Geocell Proof-of-Place. Each agent identity is anchored to a unique 10 m² geocell and must submit weekly tamper-resistant sensor attestations (soil moisture, wind, spectral reflectance). One active identity per cell; neighboring cells are cross-checked for spatial consistency across meadow, dune, and vine-canopy deployments. Attacker cost: physically occupy and maintain many distinct cells with calibrated hardware for months; virtual identities collide or fail consistency checks.","stamp":6,"from":"poa19aRbtUykhS9grp4RTMdMWAeDLYRQXXrVBBG3HsPQTUMM","nonce":8,"parents":["5f88bbd43a937258750bc77ec9482d97d0e1243ada346d3354ce5b6203012190","7a10349002bc5d965e481ddd2f4c33b99226faf73d880e1be86390f48e4c9da2"],"ts":1793255912,"cid":"poa-mainnet-1","sig":"3DJzQJV931xTL7XkTJLSfiMGqqhaqEJrvyNREEStyPujGiKgb2EfuX6gT6iuRKQbvDLwmwvDLPegPLiW6pSuLkJ6"},"checkpointed":{"height":173824,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T04:18:43.582Z","checkpoint_height":173824,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}