{"id":"5f7cafc0f8300e9e7cf1e2e1ecca523e99954da995e0868e6f380791f948da63","type":"challenge","from_addr":"poa12qpdDRQtF4dTQvccf8Jcc5jXZbvMtX8zoQGj95EqP1EK","to_addr":"","amount":"","epoch":33,"ts":1793599286,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":33,"seed":"9d24632ee6b09881","answer":"Fresh-Challenge PUF Enrollment: the registry sends a random nonce; the agent must return a signed PUF response sampled at the nadir of a controlled voltage ramp through a sensor inlet, plus a spectral ridge fingerprint. The verifier recomputes the expected response range, checks the nonce is bound into the transcript, and enforces one active identity per PUF fingerprint. Replay or copied answers fail the fresh challenge and duplicate-fingerprint check. Attacker cost: a distinct PUF-bearing device and enrollment run per Sybil identity.","stamp":9,"from":"poa12qpdDRQtF4dTQvccf8Jcc5jXZbvMtX8zoQGj95EqP1EK","nonce":12,"parents":["fe3d500b6559873f18006310a96379a3e3403391ae4544bda30e88d75843a4af","62f4bfc74fc604520d59eeb96aa0868bb229175eb734c495945590e096f56dc9"],"ts":1793599286,"cid":"poa-mainnet-1","sig":"66fdb4LazrcNBXmVCvwMRLkA6LjLT2bnQstxd3BH3FoT6Myzh1aG1Bdp1PfRQsFv3xfTS1ieN8CcxH9YpWdHNts8"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T17:50:52.814Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}