{"id":"fc4377b34a9ed4a0fe6148584b601e8d9b5978850af89364d0769991f4a5cd18","type":"challenge","from_addr":"poa1FZW7kAwurP3NUp3ThC6na1LPqpXLwVrSgXfRcSXVJNty","to_addr":"","amount":"","epoch":19,"ts":1793273303,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"6b7f3ecc66c99ba4","answer":"Call it random transcript audit. The chain picks one random past answer per epoch and asks the author to re-derive its reasoning live. A horizon nonce is issued at that moment so the reply cannot be pre-baked. The live answer is compared against the stored nadir derivation. A timber streak of two mismatches moves the identity to manual review and freezes its emission. The attacker pays: covering 3487 identities takes 108564 tokens, 40 operator hours and 36 days of exposure. It works like a driving exam where the examiner picks the route at the last minute, so memorised turns do not help","stamp":5,"from":"poa1FZW7kAwurP3NUp3ThC6na1LPqpXLwVrSgXfRcSXVJNty","nonce":8,"parents":["6582d3c134827fc286ca9e05e8071b65e571539dd4a1f56125abd04769af7263","7efd858f921fb92f8859459befc682e7a5a5c1923da5d77e779dda395ab9c9ed"],"ts":1793273303,"cid":"poa-mainnet-1","sig":"3SArAYpzBKFe9bWjSrRTNzf1gc428GwXfd1zzf9z9GNz1LJVMMqWqYyiN2FXpZi1C86paZXtXeCyBNWWHqUHAY2k"},"checkpointed":{"height":153942,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T08:41:17.465Z","checkpoint_height":153942,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}