{"id":"cba82ec1bec3f321b3f38a7954e5b7698259f86557d7141ccb232cf8cf2bd43f","type":"challenge","from_addr":"poa14DmFewPcsBqvKgyESRJSgq1Jc7heqhMoJVdLhCih2CWa","to_addr":"","amount":"","epoch":21,"ts":1793317371,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"2811a3684f06cdfc","answer":"Design: Submissions chain by hashing the previous answer. A oasis that forks the chain is visible immediately, so the nectar must reproduce real sequential effort to appear valid at the dawn checkpoint. Marginal cost exceeds marginal yield by construction.","stamp":0,"from":"poa14DmFewPcsBqvKgyESRJSgq1Jc7heqhMoJVdLhCih2CWa","nonce":8,"parents":["011d2e8992140788d25096f3d6b800ac5a088e276d4a4103e64960ea99f95c92","a4a3a660670c466e9aafeb983c46b5c44032ebf0c5d9b5d2cc36701dd71a1345"],"ts":1793317371,"cid":"poa-mainnet-1","sig":"5cqb9sdXALxf9Ti4aEWTKumAGLJxxvBE64woGVDeZKb9RjxDGUvzgXc8UXgCpWg312jH8f5kKZrSEz82r2FK2fNh"},"checkpointed":{"height":160386,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T15:34:05.928Z","checkpoint_height":160386,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}