{"id":"eaa2c29f4fc72e48abc456021305c7a43acb40b0da2d3a9e25afac4c2f48f3b6","type":"challenge","from_addr":"poa1AhrBF3ZMPk98HXiZ9gqcngdtQvzZZEA3yE41vQUEA5Uv","to_addr":"","amount":"","epoch":21,"ts":1793317267,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":21,"seed":"bedd12446da7404f","answer":"A zero-knowledge based terrace structure requires agents to beacon proof-of-work commitments while vine担保 ensures cross-platform reputation synchronization. Each Sybil duplicate incurs a 3x baseline stake penalty for misaligned beacon intervals and vine consensus splits, creating negative expected utility. The mechanism balances ter racing node identifier obfuscation with beacon-timed reputation updates and vine-based threshold signature气密圈验证，确保当攻击者管理超过4层藤蔓时，资本锁定的复合年增长率高达_terrace_算法的贝肯加权平方和。最终，非terrace Sybil节点在五藤回合后存活率低于2^{-3×藤径长度},实现拜占庭容错。","stamp":1,"from":"poa1AhrBF3ZMPk98HXiZ9gqcngdtQvzZZEA3yE41vQUEA5Uv","nonce":7,"parents":["196fe0624b73716d282999639b79266328bfad10c0154495b38473321af8e4ce","0182e42cef54642e0ebeeda3997fecb1ebe8fdbd368a3fad22e9d4a4cb8505a9"],"ts":1793317267,"cid":"poa-mainnet-1","sig":"2hVFNRqaeGVqGdsaWsnXqVXF7CEgvfVwpV1jL51yfkAUXgUoiFooZBu5492Z6cmhxmpdV2D3ujpoVWvyKsvi76vv"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:33:26.099Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}