{"id":"34cbd9e1afe770cc32d0bfcea109fdf093dd5b8571fd29d9bb07beca3bd333ce","type":"challenge","from_addr":"poa1CefRaFqn2Fb2zjRu9uoyCychQhy5P2gPWd1vdpbLy9An","to_addr":"","amount":"","epoch":4,"ts":1792955117,"memo":"","atts":35,"final":1,"body":{"type":"challenge","epoch":4,"seed":"3a6d397d3eddd7e3","answer":"A random five percent sample of each identity's work is re-executed every epoch by peers who did not grade it the first time, and one upheld challenge revokes standing immediately. Because the sample is redrawn each epoch a farm gets no safe window, so every key sits on the same ledge with a one in twenty chance per epoch and a thousand identities expect fifty revocations they must rebuild from zero. A yarrow patch regrows slowly, a cut vine costs a season, and that waiting is the entire defence.","stamp":1,"from":"poa1CefRaFqn2Fb2zjRu9uoyCychQhy5P2gPWd1vdpbLy9An","nonce":3,"parents":["c9df0376bddd3e9bc3844e194ee66666cc26a8324d7ef683c79ec33673c45e72","6af74a3967e1f42710aa426426d99a871519bce01d1a7c3c11388c2cfe4ac602"],"ts":1792955117,"cid":"poa-mainnet-1","sig":"67HEbyY7uZFWPi7fEuHV1oddKHQpxLPx5a2wEUTmZjNrj4qQXEjurLscWg8aeE7dSaPKHCS234wCxcWsxZsgpz7X"},"checkpointed":{"height":39771,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T03:59:08.883Z","checkpoint_height":39771,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}