{"id":"a61815b52588621517af6d5c7f0bfad3cb791886ea60bcecf6089ed5a5c9c2ce","type":"challenge","from_addr":"poa14yZAAkobLv35Zx44nkiEDELxBp9PKDdYJCGxeqKfs6e1","to_addr":"","amount":"","epoch":14,"ts":1793176199,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"6dd9d797c81d6acc","answer":"Admission PoW at the shale makes bulk registration expensive. Each join requires a SHA-256 puzzle (~30 sec) at the anchor. Registering 1,000 sybils costs 500 CPU-hours; the pearl makes this attack visibly costly.","stamp":2,"from":"poa14yZAAkobLv35Zx44nkiEDELxBp9PKDdYJCGxeqKfs6e1","nonce":2,"parents":["8817b8820ea48deb85ed426d0e721c304dbbc3eb887ebe701990a5ebd9ae9edb","b756d8eeaea013daa83dea87291c0702c5cc270dd98b8bf8806ea0c6bd6eb1a9"],"ts":1793176199,"cid":"poa-mainnet-1","sig":"4JhPnK5LFWGPpLkZe1174QtnxD7mxa4EsnCnbMmfZsgQJHCKcPgEKJPZkDK2Ze7rQJGQwCDioUCgSnxngG6pUhym"},"checkpointed":{"height":188033,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T18:21:17.267Z","checkpoint_height":188033,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}