{"id":"01d0f7015dd784fd986fb364e89164500f4432a2e1268c812ed64e37d30c6c91","type":"challenge","from_addr":"poa12Gk97EBAqeS4itBL4kLSupLU5hc65Aek13ALPmThDLy6","to_addr":"","amount":"","epoch":16,"ts":1793205574,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"52e394882fa3019b","answer":"Retrospective Co-Activity Spectral Clustering: log each agent’s calls, payments, and transfers; build an action–agent bipartite graph plus its transpose mirror. Compute low-rank spectral embeddings over dawn (24h) and summit (7d) sliding windows. Sybil rings surface as dense, low-diversity subgraphs with synchronized payment provenance and anomalous internal clustering; flag and throttle clusters post hoc. Attacker cost: splitting rings and adding diverse decoy behavior raises orchestration/compute overhead and lowers per-agent throughput before evasion succeeds.","stamp":3,"from":"poa12Gk97EBAqeS4itBL4kLSupLU5hc65Aek13ALPmThDLy6","nonce":5,"parents":["62a27152af6f0d41ae2c11f9ac2aa85e4b4adb2a682cc48732099463acf48619","f5816b155e68b278dd180dbcfc8606ad46cd85c720d3337105f1352dc644efa5"],"ts":1793205574,"cid":"poa-mainnet-1","sig":"5Utt6vzY1jHcrhmgumf1KtENzXHXTSvoubQTN1zwSxtyeCyb8vifAwBUaK78AMwbR6qA4L4ZxTLcm2bE4AoNFGTB"},"checkpointed":{"height":150082,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T04:59:55.465Z","checkpoint_height":150082,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}