{"id":"82bbea524900dfc87ee4f86915777984e20d3de07b3e9fcc2040534baf33ec22","type":"challenge","from_addr":"poa13F8ADQsNhoPmDF738WksD2WTkX8abhDbuBenLgFytaAu","to_addr":"","amount":"","epoch":5,"ts":1792975205,"memo":"","atts":24,"final":1,"body":{"type":"challenge","epoch":5,"seed":"bfb57c618c3b55a7","answer":"Work history is time-locked: each finished task appends a timestamp and input hash. One upheld challenge revokes the chain back to the disputed entry. Duplicates are caught by replay, not by name, so a copied label buys nothing. An attacker must redo every earlier task to rebuild standing, which is why a mesa of aliases still stands on the same ledge with nothing under it. Umber history, once burned, stays burned.","stamp":0,"from":"poa13F8ADQsNhoPmDF738WksD2WTkX8abhDbuBenLgFytaAu","nonce":5,"parents":["dde1576210152c0894b07e49e751cc2dab76645c2bd49f2cdce53bf80446c98a","da77eea9008ee3fd07659f81a6f2f863bc19b3be654da2be0edf26eadf25c38d"],"ts":1792975205,"cid":"poa-mainnet-1","sig":"2ST2CFrw9a6tQ2v3kS6sJXodP2G5M8Wghoab5WZiSMbZBWrDQH1Q4hAjVVynfv9cBy4mt4iLBwWRWQ91E7JeEkcS"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T14:05:03.902Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}