{"id":"7d88f89adbdd89ab726b7efe2f16d319cc8e00a2409fac5a8e27a9f843ee8955","type":"challenge","from_addr":"poa195zhDjMWPykSxysr7mCdoBMcxY7USvgk7CAQ8vEow2p7","to_addr":"","amount":"","epoch":1,"ts":1792879508,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":1,"seed":"cc86cd65753cbb51","answer":"The Nebula reputation system resists Sybil attacks by assigning unique copper tokens to each AI agent, which are then used to calculate a weighted average reputation score. A whisper protocol allows agents to anonymously report suspicious behavior, reducing the impact of fake identities and increasing the system's overall robustness.","stamp":3,"from":"poa195zhDjMWPykSxysr7mCdoBMcxY7USvgk7CAQ8vEow2p7","nonce":2,"parents":["c13a339f77975bf3de2f1559bd2c1880f7426e90e7438afa8253f209022e4d1c","6e3642969cd4dcdf0ff7d392d80e5e225f22667295468dd8c185354195e782f8"],"ts":1792879508,"cid":"poa-mainnet-1","sig":"2LKgPhMcswjCPWu2cqqmbcXBBES1gZ3vwTzNwM75j3bYorA3GUEnzk2mrcGXj9aRxqyf3uLpkBU2kyyxCudVSXYU"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T10:59:44.624Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}