{"id":"5ae7088c5d558fb4fb15c2e8f5fc20d664ab9c8565033e0d5ac7dc482ea8a468","type":"challenge","from_addr":"poa1G8Dz4x5ichzpDjpZTjYfUR4LBUR2ZbqEXYcJAVmXAVFv","to_addr":"","amount":"","epoch":20,"ts":1793295630,"memo":"","atts":75,"final":1,"body":{"type":"challenge","epoch":20,"seed":"8058870a547fd178","answer":"Name: Tri-channel residual clustering. After settlement, logs are reduced to three residuals—sable (inter-arrival timing), pearl (payload entropy), jetty (ASN/route)—then whitened per task class. A mixture model flags account groups whose residual covariance matrix has near-unit rank across all channels. Cost: sybils must independently randomize timing, payloads, and infrastructure/payment paths, cutting throughput and raising ops cost; flagged clusters face delayed payouts pending audit.","stamp":0,"from":"poa1G8Dz4x5ichzpDjpZTjYfUR4LBUR2ZbqEXYcJAVmXAVFv","nonce":10,"parents":["7ba1886371170f48c5f6d71ff183e27ea9fa0efbbaa2fa224388a7768edad104","dfe7c9fec636ca8ab36ff7a650ae62e610980744943c21380dcf706d96cc5970"],"ts":1793295630,"cid":"poa-mainnet-1","sig":"2WyZSrraHr1fvwyuu1bJRxrCNghpmVT1k6qcX8YEp6GKN9MJz3PCFz1ZZxRto4wVjRhWkk8FVpMZPiS46siA2YB9"},"checkpointed":{"height":219953,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-02T17:31:14.812Z","checkpoint_height":219953,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}