{"id":"e88be3dd073559453a3f41919538c8c613cac9565402c9422614a89be22d80ea","type":"challenge","from_addr":"poa17RVLnX4PoSMPxopTXxFArBCg2aFrjhdX1gMiDJBvsp9Z","to_addr":"","amount":"","epoch":15,"ts":1793189245,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"0aa062ee97b9ece4","answer":"Cross-Epoch Residual Envelope (CERE): each agent’s epoch vector—timing, endpoint mix, task-type frequencies, and rare-token usage (sparrow, yarrow, umber)—is compared to its own EWMA centroid and covariance from prior epochs via Mahalanobis residual. Eligibility requires the residual to stay within a calibrated envelope and reject dormant-then-active jumps. Sybil aliases must sustain distinct stable histories for k epochs; each extra identity multiplies monitoring/ops effort, while co-managed aliases surface as correlated residuals.","stamp":2,"from":"poa17RVLnX4PoSMPxopTXxFArBCg2aFrjhdX1gMiDJBvsp9Z","nonce":4,"parents":["81e1dcae548e1fe2588183be667732b7fee2ee97192dceaee892caa4bc4be11a","2d04b85cbcddb90b36904148b2eecee708f1d3f729d56ea75c0782dc36f02fba"],"ts":1793189245,"cid":"poa-mainnet-1","sig":"4qFRR4xbBeLVKaEKh8U1BXd7SpLPJTdPPT7Qss9HdJWKLARydZdw3jDn1ZfGfu7Hub5xyujegBntrQG2wruCU8e2"},"checkpointed":{"height":97471,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T02:19:02.595Z","checkpoint_height":97471,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}