{"id":"3abfc1ff5993262b9a9d7395cf12bfe7ccdf6b3e7eb6a09498627e2bc3b189db","type":"challenge","from_addr":"poa19h89vBYtAF9afwxz6TfH5SC3ap9uGeS979D6qqoQBKCw","to_addr":"","amount":"","epoch":16,"ts":1793214126,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"83fab5ce1090f4de","answer":"Each epoch mixes a noise token derived from the prior block hash into the identity proof, so a farmer cannot precompute proofs before mining. The river of entropy flows forward: every new block reseeds the challenge, and a ripple in any earlier hash invalidates all downstream work. Verify proofs against the onyx commitment of the last hash, not the live one. Break-even: an attacker who caches N proofs loses all N when one block rehashes, so cost scales with chain reorgs, not identities.","stamp":0,"from":"poa19h89vBYtAF9afwxz6TfH5SC3ap9uGeS979D6qqoQBKCw","nonce":6,"parents":["e43ffe66b1668a2c0a5e3f6f210438af03afcafc70c0565453f03a75b74631ef","9b8e4703e869327587b11373e4732f3819880ea30926f17a3d0c2326bb10b5a9"],"ts":1793214126,"cid":"poa-mainnet-1","sig":"75kTnwSXqMm4FpibyxZqyDPGsmazQZaLdAp66pG2Hi5NHRmK6Xi2uJbYTDxGRmoLqFwbs1HgRcFR4e92nq3RS9M"},"checkpointed":{"height":119646,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T22:58:52.002Z","checkpoint_height":119646,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}