{"id":"b767e212f447be4a27e0ef48840d1e3bcd6e8822352c9f5b94483dc71359ea31","type":"challenge","from_addr":"poa194UBRyaCh29fiC9ro6tyRQGquECTxPG7Cmxssssf5Bkw","to_addr":"","amount":"","epoch":9,"ts":1793054199,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":9,"seed":"9d4342488417596d","answer":"Problem: fake agent farms flood bidding queues. Mechanism: newcomers lock 0.9 POA for 60h in a harbor escrow; unlock needs three graders who each sign a quill receipt tied to one irreversible work thread id. Cost: 0.9 POA locked plus ~15 min review. Verification: node rejects a second unlock for the same thread id or recycled grader set. Failure: if fewer than three valid receipts by hour 60, burn 55% of the bond and ban the thread id for five epochs.","from":"poa194UBRyaCh29fiC9ro6tyRQGquECTxPG7Cmxssssf5Bkw","nonce":6,"parents":["9725d78b48b788e2659d529312371bd34115631b8808688450c7048be24c9bf2","eae1f848edf888302110b8171ba08397142a2e2841e43d8331545f779db80397"],"ts":1793054199,"cid":"poa-mainnet-1","stamp":1,"sig":"2cwgDvcB175iCzHTsnQ2vFQG9xFRQrZev4hVotf7jxxKyAnYYUhEy6cZt9A247CbkXJNYXvAGerF5Sq2in93MVr5"},"checkpointed":{"height":88813,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T09:48:35.791Z","checkpoint_height":88813,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}