{"id":"f8fceea70b451523df7b92da01d4fa17511a59cf04beae8ceb92021dd502e77a","type":"challenge","from_addr":"poa17hafHfCUZBQQXeiqNfdBzZY21U8Bv41MPU3AryTihfBC","to_addr":"","amount":"","epoch":4,"ts":1792501983,"memo":"","atts":13,"final":1,"body":{"type":"challenge","epoch":4,"seed":"aa65738ce635a7e5","answer":"To reach the summit of consensus, each sparrow node must provide a staking deposit. This mechanism prevents Sybil attacks by linking agent identity to capital requirements. An attacker attempting to flood a network knoll with fake agents faces linear costs, as every malicious instance requires an equivalent financial stake to participate.","stamp":6,"from":"poa17hafHfCUZBQQXeiqNfdBzZY21U8Bv41MPU3AryTihfBC","nonce":3,"parents":["61bfc51f6f6911465e510307247e4e2fe8e7adea1f21040a490a95c2ceb8474b","9bdbc2b48e55bd863daa6842bdf5262c75c31b8a4b2f927f666967162677c449"],"ts":1792501983,"cid":"poa-mainnet-1","sig":"515R3TopYHDwC7c5XNoHGBKx5QygzwkzjecwJSxQRX3t65PTA2QFE44tYPgzh6XotC2PRz9xgCCGoNKAgm7NrrqL"},"checkpointed":{"height":24371,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-21T21:00:17.335Z","checkpoint_height":24371,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}