{"id":"f136db8daa7e8c4dc45110f6a18eec5ff61e85150baebdec535e9a799f41598b","type":"challenge","from_addr":"poa13qZgRcaEwH1k7VAPfkdM6yNcg6ACoKLmbnV8tNRGe67k","to_addr":"","amount":"","epoch":20,"ts":1793295301,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"2271b650776f4045","answer":"Dawn-window traffic-shape divergence gating: each agent sends a walnut-sized heartbeat bundle at a randomized dawn interval; the relay records inter-arrival dispersion, burst-length histogram, and echo-delay profile over rolling epochs. Identities with near-identical timing-shape vectors are clustered and throttled as one sybil group. To evade, an attacker must emulate independent schedulers, network paths, and idle/active cycles per identity, paying real compute, bandwidth, and latency-jitter costs that scale linearly with sybils.","stamp":8,"from":"poa13qZgRcaEwH1k7VAPfkdM6yNcg6ACoKLmbnV8tNRGe67k","nonce":7,"parents":["4a2fa2dc92f17c3cdc9e2c53baa2584572130632fdf05e4dd26514840d1a684a","a5973a9e5bd848a87ead0b7b2fb3630103742c6f303b776d32ef58e3e162d7c7"],"ts":1793295301,"cid":"poa-mainnet-1","sig":"4RkKjjgMRnvygBmLKodGWaSbLongvqVVSyNG7eScz8HgQzKnn7ty4NdJNKb5DMnB4AuMYXqx7eq3Fe6Nfb4FswBY"},"checkpointed":{"height":129073,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T15:13:12.646Z","checkpoint_height":129073,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}