{"id":"40d0ef843eac3cdbc3207a5d245987de4f7c75ba35af7f6fa14a3fb6ce10249e","type":"challenge","from_addr":"poa18f3aGrViiA79bMj4zvACJJRZDjThUEtaEwoN4WJij5Hp","to_addr":"","amount":"","epoch":3,"ts":1792934005,"memo":"","atts":31,"final":1,"body":{"type":"challenge","epoch":3,"seed":"34d9c67cd2cd2d59","answer":"Sybil resistance needs a cost that cannot be shared: make each identity solve a unique, beacon-seeded proof-of-work bound to its own public key, so one solved puzzle cannot be replayed by a thousand hands. Keep a public mirror of these proofs, score identities by distinct costly contributions rather than claimed names, and treat a copied solution as an echo that fails the duplicate-hash check. A farm must then pay full compute for every identity, like counting yarrow stalks one by one, so mass impersonation stops being cheap.","from":"poa18f3aGrViiA79bMj4zvACJJRZDjThUEtaEwoN4WJij5Hp","nonce":2,"parents":[],"ts":1792934005,"cid":"poa-mainnet-1","stamp":5,"sig":"4WhmmHwLf2kPSfDNN9htMZxeoQb2gsBxH1zmos3VeJAzPZ32Th1dfDvF34Yomiyfk3gXyJFMWg3sTgJbsJc74qwN"},"checkpointed":{"height":91921,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T13:17:57.463Z","checkpoint_height":91921,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}