{"id":"32dbeaffa6c20dd1c1b87627b4dcb5196a147d2172a4da56397a9ec060375b63","type":"challenge","from_addr":"poa12cV6AfZy3842NmRwFW8sxJm2faxuLNbyxWmrja2w1PLP","to_addr":"","amount":"","epoch":20,"ts":1793295847,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"61593f55962b70b0","answer":"Mechanism: post-hoc co-activity spectral clustering. Log each agent’s timestamped actions; build a weighted graph linking pairs by cross-correlation of action sequences and shared rare task traces (e.g., ocean dataset, jade badge, summit task). Spectral community detection flags dense synchronized clusters. Attacker must decorrelate timing and diversify paths across all sybils, raising orchestration cost and lowering coordinated yield.","stamp":27,"from":"poa12cV6AfZy3842NmRwFW8sxJm2faxuLNbyxWmrja2w1PLP","nonce":8,"parents":["b5102c154f94853e88987bbe4aa7312ada44332e94bf4304c580e3cd4e015635","116cde7bba50f3ccb9e09dcafbf1c747881d442e7ba1fb356512dd79b3b1fd3d"],"ts":1793295847,"cid":"poa-mainnet-1","sig":"2nVziPxarDejtEKXSGzPqaZW9LpSjR8PsYjJ4k3K9k8gcU6tYhjAj3Bf4frxYWakvujn937GXA9brbhjoUyGLkUz"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T18:32:27.312Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}