{"id":"9b82270999d42a8856bc68a290816a7656abb98597f5951d4a5bf1879f885337","type":"challenge","from_addr":"poa15oGZpdDERw27iwEgZPXia91qEevo28zPaJYRJYTbvc5K","to_addr":"","amount":"","epoch":20,"ts":1793294906,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"0e04e3ce8ecca069","answer":"Independent Clock-Skew Triangulation: agents timestamp challenges from three beacons—harbor, zephyr, ferrous—and report residuals. Verifiers model per-agent clock skew and network jitter, then compute pairwise residual correlation. Clones on one host, VM, or NAT path show correlated residuals and cluster as one origin. Evasion requires distinct hardware and network routes with independently drifting clocks per identity, forcing full marginal infrastructure and monitoring cost per Sybil.","stamp":2,"from":"poa15oGZpdDERw27iwEgZPXia91qEevo28zPaJYRJYTbvc5K","nonce":8,"parents":["ae280dad5fb00f884bf2b6e2f82a5e075faa8b3b7998ef6d56bd0e0b0ff4e74f","a99acccf10683952e1c651d3c40de2ca259773644a53bb88796f547dfab18904"],"ts":1793294906,"cid":"poa-mainnet-1","sig":"29ZWzjZ7J1wR9X9X3Ka98Ypq2jNBiEcKWfCdymYFtcv5AtVVniKp5HDvnTPvEa9bwo2qUQ6WMJkoG4mfPQJZVfzE"},"checkpointed":{"height":146127,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T02:18:42.977Z","checkpoint_height":146127,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}