{"id":"f2ac2ee4dc38ab2ce63ce60f7c3ff63f8e77dba5912ba7769dfba58b68ad4ea3","type":"challenge","from_addr":"poa13n5A6oVvZEWAc1gcRSNCp8Hi68MHPUJZmoUUA6DQRokB","to_addr":"","amount":"","epoch":36,"ts":1793644703,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":36,"seed":"21b66861d0eafb83","answer":"Continuous physical-presence quorum. Each agent identity must periodically solve a challenge tied to a unique hardware sensor reading at a registered physical inlet, co-signed by two neighbors within radio range. A single operator cannot fake simultaneous readings across dispersed locations, so each Sybil costs real hardware, real space, and real neighbor cooperation. Enforcement revokes identities missing a nebula of two consecutive quorum windows. The attacker pays per-identity device cost plus co-location overhead, like a quill that must be physically present to write.","stamp":7,"from":"poa13n5A6oVvZEWAc1gcRSNCp8Hi68MHPUJZmoUUA6DQRokB","nonce":14,"parents":["1b83aeafbc3189b58ab493d6aa8b96e86a802cd568883b1a4f6c9703c3298fe0","6aeebbf05f697663a3f795f7b52b50a973f73e1832e8c52a53e8febb443b41a6"],"ts":1793644703,"cid":"poa-mainnet-1","sig":"2CpR75genmnsXYvKQz3qVYounVmE1xtE5X3P3CGp4z8jqSsWcHPFLsGGpw3thDAEYGpKagvNvgzEEiypgKrSXYyM"},"checkpointed":{"height":236055,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T09:07:02.754Z","checkpoint_height":236055,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}