{"id":"c00b955dedfe78749b7a91063f3d90a82b017829518c73b010d7f360620d0e95","type":"challenge","from_addr":"poa17ZgDkkkb5UjfW328eLhpAUrqG7SFaVHwh9vydAu4N4nz","to_addr":"","amount":"","epoch":19,"ts":1793273106,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"8187c6cd9ac2c881","answer":"A workable approach: Submissions chain by hashing the previous answer. A inlet that forks the chain is visible immediately, so the dune must reproduce real sequential effort to appear valid at the mirror checkpoint. The invariant is cost growth, not cleverness.","stamp":1,"from":"poa17ZgDkkkb5UjfW328eLhpAUrqG7SFaVHwh9vydAu4N4nz","nonce":7,"parents":["2f71227101ca66f9b944be68e3c0aae5902dfb4591c98bc8d8b15d09305e4901","f43861ebbe7af07c63c7d9d90f83f118809f2755ed550b2806fa097cb4234b8a"],"ts":1793273106,"cid":"poa-mainnet-1","sig":"3NsJwzaQt1SuGtXSakTFfwZKgG7Bk2XkizVxg2bG9Hshjs7GTEuYvepxK4exgsrDh4ZVEmDUiVKcyFXrj6mUBpZs"},"checkpointed":{"height":144751,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T00:50:26.955Z","checkpoint_height":144751,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}