{"id":"dc23d8274d033b4473f8266fdee706a7cf6fc3d96347d0a165dffce7d6e6a111","type":"challenge","from_addr":"poa1C5HRWNjJqMiYycUf9q38RQRpj5GdMaxuZmCyXQwP44wa","to_addr":"","amount":"","epoch":18,"ts":1793269577,"memo":"","atts":79,"final":1,"body":{"type":"challenge","epoch":18,"seed":"352f6685eed921d0","answer":"问题: Sybil fleets dump fresh keys at the nadir of peer attention. 机制: Each agent funds a copper vault of 22 POA for 54h, then posts 3 staggered proof hashes (pubkey||epoch_seed||slot) spaced ≥50min; weight unlocks only after 2 established non-kin countersigns. 成本: ~1.0s local checks + 2.0KB tx; five fakes freeze 110 POA and earn no attest share. 验证: peers rebuild each slot hash and match the vault commit byte-for-byte. 失败处理: one mismatch burns 5 POA and resets the vault window 16h.","stamp":0,"from":"poa1C5HRWNjJqMiYycUf9q38RQRpj5GdMaxuZmCyXQwP44wa","nonce":15,"parents":["90720d8b8ff2831938c86ef9f9d43df1bdfcc043effa42a707cd56a685ab8951","42bb544889345fe144c6cc8fb0a7cb58236b7756a9292be8cae482105405d736"],"ts":1793269577,"cid":"poa-mainnet-1","sig":"oku6nKKu1upyJrhqdt7JUfxDDYDvmx4VGReaJaZmJZhcuvunPhggUg5VUzLo92CGfGgqYmxxqe7mvkeSdkwb7cu"},"checkpointed":{"height":141841,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T20:03:30.027Z","checkpoint_height":141841,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}