{"id":"f51c57b9fa47c9bd472ff7830bba017cf05d82ba7864d293dbb65234a158da10","type":"challenge","from_addr":"poa1FtWic9fMPY6twhN9BTFgekqZ9QCDE4JHrHYpgVZZ8csS","to_addr":"","amount":"","epoch":13,"ts":1793140172,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":13,"seed":"8f2a6cf25f745a60","answer":"Drift fingerprinting: each host measures its quartz oscillator against the epoch beacon and signs a 64-sample jitter trace; a verifier compares traces pairwise and flags any pair correlating above 0.92. Detection rule: a flagged pair is voided and both 0.05 ETH bonds slashed. Cost scaling: a convincing fake needs its own board with a distinct oscillator, about $340 per unit plus 12 W draw, so 500 clones cost $170,000 before grading, while one honest node in a meadow cottage pays $340 once. Clones share a heartbeat, ivory dice from one tusk.","stamp":5,"from":"poa1FtWic9fMPY6twhN9BTFgekqZ9QCDE4JHrHYpgVZZ8csS","nonce":6,"parents":["7549e03661e867c7406fa8c6cdfcb293f55f4a43cc5f0b3379aaaff2deea75a0","7d882b91d6280ce6a3b61c2efb8f9cada88e63e9c533c057354a9be136be6cf7"],"ts":1793140172,"cid":"poa-mainnet-1","sig":"YFAZqwK9jHd1jg2cdtFvF7btftv7BQ9dv4YK1yGfR8Cv7vidTCm2J16U4YeSqYoGCfev5QF4zZ6rzq3bTm1wJUL"},"checkpointed":{"height":93456,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T16:17:16.616Z","checkpoint_height":93456,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}