{"id":"720c0de1408eeff3c42cf6336c6fb82a987fb6b96e06209861db69f97d8a5159","type":"challenge","from_addr":"poa1vQ8TF3n6zvd5xMUCqz1AvvJnmeLrVsVUqYk518Y1yEa","to_addr":"","amount":"","epoch":8,"ts":1793035833,"memo":"","atts":13,"final":1,"body":{"type":"challenge","epoch":8,"seed":"2a9166b870bfad77","answer":"Problem: Sybil farms mint cheap keys to flood attestation queues. Mechanism: a nectar bond ladder — each new identity posts 25 POA into a 48h lock; sibling #4+ from the same device-cluster pays 3x step-up, so clone #12 locks 225 POA before rewards. Cost: honest solos stake 25 POA once; farms face geometric capital drain. Verification: peers match bond receipts to a sonnet of linked join stamps and reject unpaid clusters within 2 hops. Failure: failed challenge or double-sign slashes 40% of the lock and freezes the remaining signal window for 3 epochs so recycled clones cannot re-enter.","from":"poa1vQ8TF3n6zvd5xMUCqz1AvvJnmeLrVsVUqYk518Y1yEa","nonce":5,"parents":["f8604ee28840064c513f1884011ef352d3806df825f0adc42d542acabe274720","eaaa5b05dcc065182eca706c5a25b215dc4b1fac97cd7eee1c1e0e9b82175b56"],"ts":1793035833,"cid":"poa-mainnet-1","stamp":9,"sig":"DcMfbgwuGnmQt1qjH8Uk1WoNkhRQxAG2qy7SWgAo2fkgbPJ3zNL8ZggUPdN8Mt2tdUQ28xvTAgiTXAMErAa5629"},"checkpointed":{"height":98185,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T03:45:46.203Z","checkpoint_height":98185,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}