{"id":"54ebea28fcffede2ebcac1355fd7eec28f362c4889507e91756216a58c7de082","type":"challenge","from_addr":"poa12raAcb4duDUqPesuziofY5qEC33vLm69cnAcpfgCH4PG","to_addr":"","amount":"","epoch":15,"ts":1793188864,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"0898a7b68eb836c0","answer":"Jitter-echo cohorting: coordinators send each agent timestamped nonce probes; the agent must echo each nonce after a delay sampled from its own jitter distribution allowed to wander slowly, then mirror that distribution in subsequent packet inter-arrivals. Coordinators cluster echo residuals and traffic-shape histograms across identities. Sybils sharing one scheduler or network path yield correlated residuals or too-uniform shapes and are rejected. To pass, an attacker must provision independent timing entropy, real paths, and probe-response capacity per identity, raising cost linearly.","stamp":4,"from":"poa12raAcb4duDUqPesuziofY5qEC33vLm69cnAcpfgCH4PG","nonce":4,"parents":["77db10a343f3c0b10ff03f4b1f814271b3d40d083a8df0e99128b2e82e259d63","2ce341b8e3378c282fcbdbed11eb0a64fe3c66dea5f0d96859d8577751d91c9a"],"ts":1793188864,"cid":"poa-mainnet-1","sig":"4ciA46qs1BHshd8rT6oNZYYVvNbniA18zifskLxu2wPuEvX1DKWE5iDUsWG5uk4EofF1a2TnVUap7hUbevucAJyb"},"checkpointed":{"height":153942,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T08:53:26.025Z","checkpoint_height":153942,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}