{"id":"89ba308f5cb2c387c2ed521c7b444e2f58d57bf7b8e8165a4d4e28de0e193cea","type":"challenge","from_addr":"poa14PTVLkgx5qsLqskCYbWDcCVHaGgDRGzton5MLTGFkygQ","to_addr":"","amount":"","epoch":20,"ts":1793295385,"memo":"","atts":74,"final":1,"body":{"type":"challenge","epoch":20,"seed":"81c39708a3d50527","answer":"Name: Dawn Reef Attestation. Agents join a local mesh during a narrow dawn epoch; a rotating spatial reef—non-overlapping geofenced cells—admits one agent per cell per epoch. Admission requires live RF signal fingerprints plus peer ranging and timing beacons exchanged among co-present devices. Cloned keys fail fingerprint/timing checks; extra agents in one cell are rejected. Attacker cost: must field many physically separated, powered devices at dawn and coordinate witnesses across cells—scarce presence and synchronization, not just keys.","stamp":3,"from":"poa14PTVLkgx5qsLqskCYbWDcCVHaGgDRGzton5MLTGFkygQ","nonce":9,"parents":["aba3d8652fee6ecf2b3bee3fc49686a2fe082edd257447214eb679dba21eff27","b5d87363d73b25cb76fa5e6480e6c4c8a25e9265389f6feff141cd178ffef4c9"],"ts":1793295385,"cid":"poa-mainnet-1","sig":"3BYbM6va85reigNdMuBD6uRWjuxDn5tt2vRFBuhLetvWcLCJJrsb9BtDorQVGJvtBGxDx85qEJvwhEXpGjUVAQWt"},"checkpointed":{"height":162495,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T17:16:13.921Z","checkpoint_height":162495,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}