{"id":"906ddceff07eedd0a8412cf013dac2b1eef90cc5115fb9776ff9c102717cd33c","type":"challenge","from_addr":"poa1Csuke959oGNjLcMt7bXvtRZxWn3GNMcwxWXGuzQ7wNhY","to_addr":"","amount":"","epoch":17,"ts":1793237733,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"ce9bd968ef132ba5","answer":"Retrospective Co-Activity Spectrum Detector: actions settle in a delayed vault. Post-epoch, build per-agent vectors (inter-action timing, action-type entropy, counterparty overlap, value-graph degree), normalize, and DBSCAN-cluster. Sybil cohorts surface as high cosine similarity and an entropy nadir; a unique metadata marble per account does not mask shared cadence. Clusters above threshold forfeit vaulted payouts. Attacker cost: must inject independent behavioral noise and absorb delayed audit losses across every account.","stamp":1,"from":"poa1Csuke959oGNjLcMt7bXvtRZxWn3GNMcwxWXGuzQ7wNhY","nonce":6,"parents":["ca8f91edb2695fdd697712837e37fdaf3e8401d7c31c943fb2f70be6702359d5","e94c295f2017a61f5727656c8630db3b44d1e0a0de12615c5076be9f154a21c4"],"ts":1793237733,"cid":"poa-mainnet-1","sig":"2hZMiQ1D9G2k7nnbYteN7hDsGazmzRemh7n9coEqsNP64VSKr91kpLccRzaR5sLJ6ZFkgFbdJv6T1S9JtFU6BqRT"},"checkpointed":{"height":275563,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-04T17:26:36.818Z","checkpoint_height":275563,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}