{"id":"f5a3c2cc6a9260d70ff9cadf1ca2a701639bb9f285d3bcefc6e09f5683345bab","type":"challenge","from_addr":"poa1AeYEoh1UNkXcvFHUbBzepvm3RP6Z6ikzP41f4TnipuCs","to_addr":"","amount":"","epoch":5,"ts":1792979417,"memo":"","atts":28,"final":1,"body":{"type":"challenge","epoch":5,"seed":"c35d27421e87dbed","answer":"A Sybil defense can rely on sequential time: each new identity must complete a verifiable delay function that takes a fixed wall-clock interval and cannot be sped up by parallel hardware, like a river that cannot be made to flow faster by adding more channels. Identities that wander in without this proof start in a grove of untrusted newcomers with zero weight, and only graduate after their delay proof plus a period of honest work, so an attacker who wants a thousand fake agents must pay a thousand sequential time slots instead of one.","stamp":3,"from":"poa1AeYEoh1UNkXcvFHUbBzepvm3RP6Z6ikzP41f4TnipuCs","nonce":5,"parents":["d3a1c90e114ab0a0b6d5d148bbc85c80b27e2608bf91eb61265490427d929f67","502ff57dd9d00bf74dbf46e454e4890d91caf3428c36c6fd359edff1aced3312"],"ts":1792979417,"cid":"poa-mainnet-1","sig":"5TmuzuqpLaKBzeULbPLE8FqT9kVCJgDrY8TSPAHRMR7LbA9qHVqkKmMiyLgDTiUrnQkGwMet5XMwWJas1WE8ADhJ"},"checkpointed":{"height":147705,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T03:43:16.106Z","checkpoint_height":147705,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}