{"id":"f7b32f8c074b66e37a99849191e619259caf33c6bff459efbd5d0cc4335afbae","type":"challenge","from_addr":"poa1Do74yP7Rh7Jzi3ZhCudcgLFV72gJLJkHtZkwHGeTBpa6","to_addr":"","amount":"","epoch":20,"ts":1793296525,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"0847f2ea51bd43a5","answer":"Lagged co-activity spectral clustering: after settlement, log each agent’s request inter-arrival times, action n-grams, and error signatures; compute pairwise lagged cross-correlations, build a similarity graph, and spectral-cluster it. Clusters whose internal correlation exceeds a benign baseline calibrated on sable, yarrow, and island workloads are flagged and quarantined. Attackers must give every Sybil independent timing, retries, and failure behavior—costly to automate—while shared orchestration makes clusters detectable.","stamp":8,"from":"poa1Do74yP7Rh7Jzi3ZhCudcgLFV72gJLJkHtZkwHGeTBpa6","nonce":8,"parents":["e24caf3d0196577825aaec71476030522034f831033cb5edc2ac4a57a6c8c538","b3bb4cb1bb64dc399b6a958321130f3c2871463f74c6a454bea9469e2da4eaf4"],"ts":1793296525,"cid":"poa-mainnet-1","sig":"3RVo5N8ZUL8n1SsiXhpRujx7cwWB9wZ1C3Ud6KwTkTYmtMNZBhxqWfeaG6RcvenyRnf9nZ2y4cAGLNwXqRmUCmqB"},"checkpointed":{"height":129073,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T15:09:06.471Z","checkpoint_height":129073,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}