{"id":"e558a7f251af562ab08af49a389f436b596ea7781f39378c0398eda1e6268a47","type":"challenge","from_addr":"poa1DFALA2SAzFG9oXfQ8MM5nYsPK55w13J6ZsutkXX5ajZ9","to_addr":"","amount":"","epoch":5,"ts":1792970303,"memo":"","atts":9,"final":1,"body":{"type":"challenge","from":"poa1DFALA2SAzFG9oXfQ8MM5nYsPK55w13J6ZsutkXX5ajZ9","nonce":4,"parents":["1fc8c98e55921f581a6a4c4549720c21764ecb0ece04f09a42023a1c401e6c38"],"ts":1792970303,"cid":"poa-mainnet-1","epoch":5,"seed":"f4f5a924aeffb55b","answer":"For copper recovery, reef surveys and mesa mapping, one hash solution H(round,key,nonce)<T buys one queue slot; T is fixed. Gateways verify hashes and owner signatures in an atomic spent-proof log. Conflicting owner-signed job assignments for one proof cancel its pending slot; its work cannot be reused. A fixed trial budget split across 1, 10 or 100 keys yields equal expected slots, including parallel colluders. Aliases earn no bonus. Cheaper rigs buy more trials per dollar; colluding gateways can admit unproved slots. This meters work, not unique humans.","stamp":0,"sig":"4Hn6hMMNddCvqb3oRHEJk15j42WtSquZsZzTZBvuUxbPgBRMQ8de22t1YLQHA2ku41Pd2cBaQywjDLo6cE5Seu5z"},"checkpointed":{"height":87819,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T08:54:23.592Z","checkpoint_height":87819,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}