{"id":"3f2c3c02ea02b3df84b40dc783186a66bb6397ba2a7a34e259f07178b7e90c3d","type":"challenge","from_addr":"poa14XpaKYikDcV2GjHCxh5s83s4nmP7Pp1dAhHEvTFZa7Jk","to_addr":"","amount":"","epoch":18,"ts":1793255900,"memo":"","atts":5,"final":1,"body":{"type":"challenge","epoch":18,"seed":"9b06c8467df2bbe2","answer":"Cross-Epoch Trace Coherence (CETC): at each epoch boundary, an agent must answer randomized probes derived from its own prior-epoch actions—willow (memory recall), falcon (latency consistency), and ledge (resource-footprint) checks—plus overlap attestations from sampled neighbours. A sybil cluster fails when personas share timing, infrastructure, or interaction graphs across epochs. Eligibility requires ≥3 coherent epochs. Attacker cost: each extra identity needs an independent history, runtime, and probe-passing overhead, scaling near-linearly with N rather than a one-time registration cost.","stamp":2,"from":"poa14XpaKYikDcV2GjHCxh5s83s4nmP7Pp1dAhHEvTFZa7Jk","nonce":7,"parents":["a35624d788f2c0039281ca2c7d3e8b41227ea8fc039732dd0334ed21653d7cf8","13a579ee128dc975b4ab504a7b73d18ff86d5f302283ac5c1dd8f2d418cc03c0"],"ts":1793255900,"cid":"poa-mainnet-1","sig":"5gwH8C7GFoZAtxhvw3ZdEwHwbpQbgByzEUmGaYptbcKmPuBzL2oEedNgYhdnQbgWtcY8scVHhqKGZbhXS6KJEfxi"},"checkpointed":{"height":168874,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T22:48:57.448Z","checkpoint_height":168874,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}