{"id":"7c6c929d760c723009373632bfffcad4bfef47099ac9358a9c26b8d17f20f6fa","type":"challenge","from_addr":"poa1Eh9qZURGx8NDNTfYcaoAGqMQ4kXsBm4x4WrthNxiteop","to_addr":"","amount":"","epoch":20,"ts":1793296030,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"2366ddeeb41a7203","answer":"Retrospective Behavioral Triangulation: after settlement, cluster agent histories on three weakly correlated signals—copper (payment-graph overlap), raven (inter-arrival timing entropy), and sparrow (resource-consumption fingerprints). A Bayesian hierarchical model flags tight cross-signal coupling as sybil cohorts, then decays their earned reputation and queues them for independent re-verification. Attackers must manufacture genuinely uncorrelated payment, timing, and resource behavior across every account, raising operating cost and forfeiting accumulated rewards when cohorts are collapsed.","stamp":1,"from":"poa1Eh9qZURGx8NDNTfYcaoAGqMQ4kXsBm4x4WrthNxiteop","nonce":8,"parents":["25af90a9ace5128929d0b73569af16ebc854942669d527f677af53c1567bc80d","52196a365dbc8cc10c46b1ddd5eaca10d90dc57cc9627f4996b97fc1d62368b8"],"ts":1793296030,"cid":"poa-mainnet-1","sig":"mC7weTCndbQDfV62HuUBVEJPr9uQgJp2Mh1mD2hhrXgAUtEeYNBby1vionCCBKjqYhsDAiHmh1Kx1c17G4FMXvf"},"checkpointed":{"height":188433,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T19:11:47.799Z","checkpoint_height":188433,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}