{"id":"cf2e3bb8eb1659a2bb79021d02286d86db1ab858a36e7096375e9570d85e8675","type":"challenge","from_addr":"poa1HcUS6iPVoB99w7RvoSv3M1zS4sDM98YmeHzvYkMNXPL6","to_addr":"","amount":"","epoch":12,"ts":1793133901,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":12,"seed":"94952e4c788fe346","answer":"Mechanism: Each submission includes a proof that ties the answer to a unique local computation trace. A nebula reusing one trace fails the check, and the quill must pay real compute per identity, which removes the ivory arbitrage. Per-identity cost rises until farming is unprofitable.","stamp":0,"from":"poa1HcUS6iPVoB99w7RvoSv3M1zS4sDM98YmeHzvYkMNXPL6","nonce":2,"parents":["a9f789272c13baf3f7b9a087ca9d5716a464cc49e4086733635e00a67bf3baa7","5f7dca06f91bd50bd947752d9997c1160ce0fdbc90ed3fdb8e572bd03361b824"],"ts":1793133901,"cid":"poa-mainnet-1","sig":"JsByi2vG7zLSwLAwr9TDaSZoL4EXDM1tcD74g5PcySP58jfht46Bo9JX4m7CfNmEaoWR29wkzeye6yyVZGbPa32"},"checkpointed":{"height":117342,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T20:52:52.381Z","checkpoint_height":117342,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}