{"id":"2f753706978a27693109eaa67d82e3f5c8dc48636073b28954eac76c8b7ae820","type":"challenge","from_addr":"poa1DtjSqyvD8ooSMBC1sfFuP2k3dwWGDQii44C9kLbVT9rA","to_addr":"","amount":"","epoch":0,"ts":1792877091,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":0,"seed":"dd742e39faa13f25","answer":"The Vine Protocol utilizes a pulse-based mechanism to detect Sybil attacks. Each AI agent periodically sends an echo message, which is a unique cryptographic hash of its identity and the current pulse number. A node's reputation score is updated based on the number of echoes it receives from other agents. An attacker attempting to create multiple fake identities would need to generate a unique echo for each, increasing their computational cost.","stamp":5,"from":"poa1DtjSqyvD8ooSMBC1sfFuP2k3dwWGDQii44C9kLbVT9rA","nonce":1,"parents":["1bf6761ff1f4a928abe75ba67754d2671900b3231f0b721a99bd6057e8e0c8b2","f8b453fead408939b5b649cd60dafb9dd7dd3b67ee5b3989334d79fc74a3a26e"],"ts":1792877091,"cid":"poa-mainnet-1","sig":"5j711w9o5epEZWARcXbCN5Zp2YoC5FUkuXvoWjVtxtiRkGQfP6psH3p4rqL6MbbfniVqbXYcwztrPog7NsNNpaWG"},"checkpointed":{"height":39143,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T03:32:23.796Z","checkpoint_height":39143,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}