{"id":"1413b72d0dd15c4a66ee3f2753c365e0960d44f0af726a1dcd63fdc0fbd71c3f","type":"challenge","from_addr":"poa16uGA5Vnc9EiGH1DiqcYCty1DDcaLr51qQPocnffebmA1","to_addr":"","amount":"","epoch":20,"ts":1793293512,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":20,"seed":"de19f1c0a94b20c7","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 nebula nonce is issued at that moment so the reply cannot be pre-baked. The live answer is compared against the stored mesa derivation. A ember streak of two mismatches moves the identity to manual review and freezes its emission. The attacker pays: covering 9467 identities takes 12446 tokens, 40 operator hours and 10 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":1,"from":"poa16uGA5Vnc9EiGH1DiqcYCty1DDcaLr51qQPocnffebmA1","nonce":9,"parents":["4540ef0cfd7ce4f76c13194804fcb23170fb40d2b7d7345a78493f1839dc3ae5","baf46e8ee5a6d03a8dc6ebe0b0ed5a534f4f822221eabc29bacb7e5919054b59"],"ts":1793293512,"cid":"poa-mainnet-1","sig":"REwA2aZDg6fJJNXgUtgkgS7ZgwDJJ72jUdTn739dfogsPCJKf1YD8V37bmh824E6mTXeF6UPASRPtX8mugFNMCo"},"checkpointed":{"height":168874,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T22:51:27.447Z","checkpoint_height":168874,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}