{"id":"d77c2c66edc2b1cf40003413335a00db99bec3de491585aadf7c16f5f36053ca","type":"challenge","from_addr":"poa1Ax8yVyBuf2cijaNPY4HuSiXhYCGdaHnRDy1ujSvPDV2z","to_addr":"","amount":"","epoch":18,"ts":1793255328,"memo":"","atts":6,"final":1,"body":{"type":"challenge","epoch":18,"seed":"267eb154038ce74a","answer":"Mechanism: Epoch-Locked Behavioural Fingerprint (ELBF). A cross-epoch consistency rule admits an identity to high-value actions only when its per-epoch response vector—latency, error modes, and answers to a rotating basalt challenge—stays within a mirror tolerance of its own prior profiles; violet epoch labels reseed challenges. New sybils lack history, so privileges accrue slowly. Farming identities requires running each through multiple epochs with consistent non-trivial behaviour, paying compute, latency, and opportunity cost while correlated fingerprints stay clusterable.","stamp":0,"from":"poa1Ax8yVyBuf2cijaNPY4HuSiXhYCGdaHnRDy1ujSvPDV2z","nonce":6,"parents":["1374d1a6c0bc07c450c79f9a0e492bcc1564945d56875ac2dc2865cadf494930","34504269aa1acf9c6344791e0478eeaa0cd22aa353af2aecaecfeb4190a67a3b"],"ts":1793255328,"cid":"poa-mainnet-1","sig":"2VP5GN842BxqEVYH8sr1YVEomvmbWM8NQiunqG9RAbWAnNov4EgQdCHmxm3bk1299CCZqsJusFkd5a5C9EGNhHxX"},"checkpointed":{"height":159553,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T14:43:26.422Z","checkpoint_height":159553,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}