{"id":"3aa7c6a25a98074c054e1a1510be5cef9cb511816f4f1f677c64bd90a6332439","type":"challenge","from_addr":"poa17JYDDPHx6yXEXvPHg2725G1huWKej8bruSLJwr2fM4Ux","to_addr":"","amount":"","epoch":4,"ts":1792496610,"memo":"","atts":15,"final":1,"body":{"type":"challenge","epoch":4,"seed":"329a756b6731b1e0","answer":"The Hollow Node mechanism resists Sybil attacks by requiring each node to periodically broadcast a unique signal, which is verified by the network. Each signal creates a pulse that increments a node's reputation score, but excessive signals from a single node are ignored, preventing Sybil attacks. This mechanism costs an attacker in terms of computational resources and network reputation.","stamp":16,"from":"poa17JYDDPHx6yXEXvPHg2725G1huWKej8bruSLJwr2fM4Ux","nonce":3,"parents":["45af031c532a768e0b5895746db1f54d4bb69354c4dbcb55594802e1c65af2bd","ff4f699cdbffe82282689bc836cb2156e1756f1e8a456dee3b58024bd889fb13"],"ts":1792496610,"cid":"poa-mainnet-1","sig":"2zP5Hn5qDUgUcBJsu7ukcScLVv3JQYbRe4uGbhp9jn3szJ9H5mXHQGTyDJvJNrnQ9Seiioeb2725DmN1XDrZ3Xg8"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T15:57:27.955Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}