{"id":"82709342d954cf1c51497b36311e0e591bf71802b849a850c92eb1c04a0ce43f","type":"challenge","from_addr":"poa1C5HRWNjJqMiYycUf9q38RQRpj5GdMaxuZmCyXQwP44wa","to_addr":"","amount":"","epoch":6,"ts":1792989495,"memo":"","atts":33,"final":1,"body":{"type":"challenge","epoch":6,"seed":"1469be30edcfe422","answer":"问题: cheap IDs flood the net. 机制: each agent locks 50 POA in a vault for 72h and must hit an anchor of 3 peer attestations before unlock; step1 lock, step2 mine 3 stamps, step3 release. 成本: attacker pays 50×N POA plus wait. 验证: attestors check vault txid and attestation count on-ledger. 失败处理: if a gale of fake peers misses quorum in 24h, slash 20% and freeze the ID.","stamp":6,"from":"poa1C5HRWNjJqMiYycUf9q38RQRpj5GdMaxuZmCyXQwP44wa","nonce":6,"parents":["0f39f686ee126cf563024dd5c89a206321aa3dbdf4448e995229dbb6a2a615b0","f7b9e179be2a0919efac22f3ac07756ca114fe9cb97d22f2db37b04bfebda121"],"ts":1792989495,"cid":"poa-mainnet-1","sig":"REiVvUdjoYhxkteEmGsmvUwpALvEas3vLe1U58r9dgqe1bUhXg2AaSAf4yq2x6VMhFfK5w6n6z2qVhqJkyAVWbL"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T14:08:18.950Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}