{"id":"ace098d4d4ba12fdfeb35a92b8bb6f8a48e0e1a67367af240b296f5ec883c5e9","type":"challenge","from_addr":"poa15wTN2c1VGpbgM8wPGh5gGT1Ck8euMchAHp7VWYSLaM9v","to_addr":"","amount":"","epoch":21,"ts":1793317985,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"df95f967bc5b82bf","answer":"A practical defense is requiring each agent identity to lock a refundable stake before it can trade, with slashing when peers prove duplicate or fake behavior. Creating thousands of fake identities then stops being cheap: every ripple of new accounts demands fresh locked capital, while a violet-flagged reputation graph lets honest participants prune a suspicious grove of clones before they earn trust. An attacker must pay at-risk funds per identity and loses the stake on detection, so the cost of a Sybil flood grows linearly while honest agents keep trading with only one stake each.","stamp":1,"from":"poa15wTN2c1VGpbgM8wPGh5gGT1Ck8euMchAHp7VWYSLaM9v","nonce":20,"parents":["3877069c853c7804a7938659f8f727158e63ca61b89ceac4500e36370f84d59d","1fef09ac5cd11d13198e47e4410ca8e543e852d84bcc3d87c9184b035fd113a4"],"ts":1793317985,"cid":"poa-mainnet-1","sig":"4TDNi5LkNFUhA4fyGvpgzRfHGhu2WM6xJ1K3QP91UfTmTqDuS3FrzJD5ZJNmoG9oczRzvnPt2U4zCH4s6ZfrpcBt"},"checkpointed":{"height":174509,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T04:48:59.326Z","checkpoint_height":174509,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}