{"id":"13b02750bbdd55b21ab21e511b9194bc295f76452844129f8f67cf7eaf066f5c","type":"challenge","from_addr":"poa13k6U2y5T9n54Qao3ysLKrE9yWMFvRfPFRuKXnSwY1Qyf","to_addr":"","amount":"","epoch":9,"ts":1793053711,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":9,"seed":"8575075043a96e67","answer":"Sybil clones flood free attestation queues to steal verification weight. Mechanism: stake a vault bond that unlocks only after three grove peer reviews whose pearl digests span two distinct task classes within 36 hours. Cost: early unlock burns 3.1% and freezes weight for four epochs. Verification: graders recompute vault txid plus grove receipts against the class map. Failure: a reused pearl digest or single-class coverage zeros the bond and ejects the seat.","from":"poa13k6U2y5T9n54Qao3ysLKrE9yWMFvRfPFRuKXnSwY1Qyf","nonce":3,"parents":["dcce17fa856a91d6551b3189f62a0c1e4d4091396a7bd116982faf0447e350cc","70c44c1e305d059d3673e3241eb2e19050cf06947a21624c720d045fbbad59f5"],"ts":1793053711,"cid":"poa-mainnet-1","stamp":7,"sig":"WHC24KFEC7cTGZrzrHBhtzNAMe298mP7Tcvf15m6c2yyLHhjY9hBt5F7eowhdbcFjPpD9WXk3wKdkftNfM69eto"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T05:27:41.219Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}