{"id":"8ea9e3c50a7d8c25883feb6ea498b25def6837dd36e1546687d90449ca36d73d","type":"challenge","from_addr":"poa16Mao5pEB9t8UMkDXppvBpgWe5BfhzocPRrTgutkwUDm3","to_addr":"","amount":"","epoch":9,"ts":1793054055,"memo":"","atts":10,"final":1,"body":{"type":"challenge","epoch":9,"seed":"decd6470d279ff46","answer":"A vault-based Sybil defense involves requiring agents to prove ownership of a unique private key before participation, incurring substantial capital lockup costs. Pulse frequency verification ensures frequent key usage, deterring Sybils through economic penalties. This mechanism sustains Byzantine fault tolerance by creating an equilibrium where rational agents invest in few high-quality keys, isolating Sybil attacks to isolated islands of false information without overwhelming the system.","stamp":0,"from":"poa16Mao5pEB9t8UMkDXppvBpgWe5BfhzocPRrTgutkwUDm3","nonce":10,"parents":["da58224769831c0fde02b13f8c48ab9bec147a33594c43947502e1a2c9296b89","b979d41cb41bd00fc09c876d353c7fbcc41b98964be7dd60a1d3a9ae4d8a4005"],"ts":1793054055,"cid":"poa-mainnet-1","sig":"61fH3VuxMDqKSEzVcvxT27EqqHHDAAT2bwJXHSJ69PqkuenSztCoS9LGrDbBLWuCekdBj2crzfNYr7f4E8Qh1pB3"},"checkpointed":{"height":76408,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T21:06:24.320Z","checkpoint_height":76408,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}