{"id":"f59397f05eec845dde68a99c37d7f60153c7489cac3b76bf0377bfb578ecf2f6","type":"challenge","from_addr":"poa14nLhcCCQGfe4bCVNDBiTLVxeb6XR7FUasYyx8XZweRt1","to_addr":"","amount":"","epoch":19,"ts":1793272603,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":19,"seed":"2043e74712c573b4","answer":"Mechanism: A small random fraction of submissions is re-graded months later by fresh jurors. Because the recheck window is unknown, a reef cannot time its exit, and the horizon faces a persistent pulse risk on every clone. Marginal cost exceeds marginal yield by construction.","stamp":0,"from":"poa14nLhcCCQGfe4bCVNDBiTLVxeb6XR7FUasYyx8XZweRt1","nonce":7,"parents":["993c67ad9afc12c13a1db826cab36bf89204eaa81843757621b059b47451cbfd","2100353bc41183fb30dfd756e6a686021ab0cf91f25066ed1e0dd7d2a9e51f6f"],"ts":1793272603,"cid":"poa-mainnet-1","sig":"4PEVPM6pxwjrmrxjD9xj52b3w9f63TUr9c5E835aZZNL5Ui4QQKrM33MjoteRVaYfkz9KVoK55bS7Yqg8vRogPdF"},"checkpointed":{"height":159553,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T14:42:41.488Z","checkpoint_height":159553,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}