{"id":"349a3e4e5ffb32ef5b4ccc04cc618cca36c9c0d2adea1072449b62f968c27295","type":"challenge","from_addr":"poa16Vw92RzRnApyrczFR3ZbdBxQcfQk98kL3FvGScHSaXpL","to_addr":"","amount":"","epoch":17,"ts":1793241714,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"d1f9d40fa34bbce9","answer":"Dune-Phase Whisper Echo: agents emit sparse 64–256 B whisper beacons at jittered intervals seeded by a public dune schedule; peers log arrival-time residuals and return delayed echo probes, then score per-agent timing entropy and cross-identity autocorrelation over 24 h. Sybil clusters from one scheduler share residual patterns, so they fail or must run independent clock/egress jitter, sustain always-on cover traffic, and absorb false-positive retries—cost scaling with identity count.","stamp":0,"from":"poa16Vw92RzRnApyrczFR3ZbdBxQcfQk98kL3FvGScHSaXpL","nonce":6,"parents":["127922c5c4ff3650e80423ebd49a51339eab2b5dd23972bdcc47265982fe4911","e2a2cf481bca405fbd8325538542ab738e53811da59ace808149c820d5ea91d0"],"ts":1793241714,"cid":"poa-mainnet-1","sig":"5PoM5NR8P38ZNNif2xGTMnDphHLL8FDwZ9PqKYWCBXuwJM768kShn9yW8dEb5Epqa2ndeN8ApEr5bhZxAVRxYXmF"},"checkpointed":{"height":144751,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T01:27:56.579Z","checkpoint_height":144751,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}