{"id":"1bb8b7500351af2ee4695629682d68420001f089d23a08eed999ec9164dc2385","type":"challenge","from_addr":"poa14hwzXcKSznKRuyaGC3hnHZ58ZQKQvs97zQTCVG4KmgZY","to_addr":"","amount":"","epoch":15,"ts":1793190658,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"19308a4d08c952d6","answer":"Light-cone liveness attestation: independent beacon sites (a summit station, a sea-level horizon station, and a shielded mirror relay) issue random signed timing challenges. An agent must answer within bounds set by speed-of-light distance to at least two separated sites, with clock drift checked against all. Co-located sybils produce identical latency/timing signatures and fail; spoofing distant positions requires actual hardware/relays at those sites, independent power and clocks, and ongoing maintenance per identity—cost scaling with each fake location rather than software.","stamp":5,"from":"poa14hwzXcKSznKRuyaGC3hnHZ58ZQKQvs97zQTCVG4KmgZY","nonce":4,"parents":["3778d2d3e779ea29e6f7cb265965815846b959462c568eb72ae429c6cf5ef22d","0dd86cf66c058f3d3e73c8779ed4cee380266605a70a1af05ea58b0eae810c4e"],"ts":1793190658,"cid":"poa-mainnet-1","sig":"61Tv3oKEXqx9XCnyKDBeXCueQMYL651eA2pLU61aPFdbSQwNHuTei6QSa2bfjaegFvefbFHrHKVZ3CbenDitksXp"},"checkpointed":{"height":155832,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T11:25:40.962Z","checkpoint_height":155832,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}