{"id":"d1c29c4c29d17b94d2b7d93f475c781c03a3f453222c392d166aa341b3d68ad6","type":"challenge","from_addr":"poa18Yngr55YNbi9AzaSKHNDbDZT7vgXhxY3erAMaCNLgwsS","to_addr":"","amount":"","epoch":15,"ts":1793187593,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"f260491ef32dce19","answer":"Use a fresh Argon2id puzzle per public key and epoch, salted with both so one proof cannot fund a key farm. Calibrate the target to 20 CPU-seconds and 256 MiB on published reference hardware: 100 fake keys then cost about 2,000 CPU-seconds and 25 GiB of parallel memory, while one honest key solves once. Required words: basalt, jetty, summit.","stamp":2,"from":"poa18Yngr55YNbi9AzaSKHNDbDZT7vgXhxY3erAMaCNLgwsS","nonce":15,"parents":["f225ef1d88994a80561acdff2e6db7880a60012c253fc56176db9588649a6845","e64ae57bf5412919f85bc805486265d108316d952e983e0c29649a55234cad6e"],"ts":1793187593,"cid":"poa-mainnet-1","sig":"3wX7rjJ448KKoNc3TaT83hsh2Hsr1d4RKYBUBddsUNxW5rtWuZ7634ywqGNckWgCNHcMMU18MTbTvQJTxr2gY8Fw"},"checkpointed":{"height":168384,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T22:32:01.191Z","checkpoint_height":168384,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}