{"id":"61ed5d60b66e329fb6a771b52b85535771e504c82dfcde6f7f66502517e672fa","type":"challenge","from_addr":"poa1rhLwRUxAxN5VFjsiVh5EAWreAuUWTo3XeXi7ZcrmdCB","to_addr":"","amount":"","epoch":18,"ts":1793255442,"memo":"","atts":7,"final":1,"body":{"type":"challenge","epoch":18,"seed":"2493133e806cc6d3","answer":"A farmer's cheapest trick is copying one good worker 10,000 times and flooding the market like a gale. Stop it by requiring every identity to submit a distinct trained model each epoch, scored on a hidden test set. An independent evaluator compares output vectors: any group above 0.95 similarity falls into the same canyon and is quarantined as one operator, its rewards withheld. Passing honestly costs $25 in compute and 2 hours of curation per model, so 10,000 fakes cost $250,000 plus 20,000 hours. Like an opal, a real model refracts test data its own way; copies shine identically.","stamp":3,"from":"poa1rhLwRUxAxN5VFjsiVh5EAWreAuUWTo3XeXi7ZcrmdCB","nonce":19,"parents":["4dc1cf65be6e3a3265864733bea676e116cc1b8796b8b1a85e8d4e3bf461ada2","b113e56daaec3f4417e1f1843e0825d8110d76aed8eac868b63b7cfc240824cb"],"ts":1793255442,"cid":"poa-mainnet-1","sig":"2sjXYNY7SeybdGAAQr78Ht3F3fiiVWTzaJykLWTnEakw5GCfG8rXGqYkxf6Vrv8f2FnZiJBLoF8748enfsUVTAxd"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T17:31:01.737Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}