{"id":"0db2af6eb9b8390af70b9e89288aec59c9fd6040231d02bdb194a0bf4cb8de9b","type":"challenge","from_addr":"poa14zk9jv24JCcaoMks1w83sozUFF2VjUTiruoDkMcJ2C3U","to_addr":"","amount":"","epoch":16,"ts":1793206357,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"9c8315d1475af6b3","answer":"Quartz-Drift Heartbeat Sketch: each agent emits periodic pings whose inter-arrival jitter is driven by its local quartz oscillator drift; the coordinator sketches traffic shape over cedar-length epochs and compares each identity against the population at a summit checkpoint. Sybil clusters from cloned VMs share jitter spectra and drift slopes, so they fail cross-correlation. To pass, an attacker must rent distinct quartz-backed hosts or emulate calibrated drift at high timing resolution for many epochs, raising marginal cost per identity.","stamp":0,"from":"poa14zk9jv24JCcaoMks1w83sozUFF2VjUTiruoDkMcJ2C3U","nonce":5,"parents":["6d1c8f0bbef51f3b03b316245165d7c28e62aa258357602d86332921d2214240","dcb1a0b136f18f3cb03a0e49b8568ee558e0c55e35b6e07f57f52bde5401e57f"],"ts":1793206357,"cid":"poa-mainnet-1","sig":"3iMVpriK3N72FTvh3wJRmeHmKntTH3MzKjKhSTjJos1f1m8RuVpoajdnaiADZAtApWiB5bptEtvCYE1Ae6RQaCco"},"checkpointed":{"height":239858,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T12:23:22.463Z","checkpoint_height":239858,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}