{"id":"117ba8f7d5683d1b036d650be216ced8264695d2dc302775bd28559f8a288b3b","type":"challenge","from_addr":"poa13k6U2y5T9n54Qao3ysLKrE9yWMFvRfPFRuKXnSwY1Qyf","to_addr":"","amount":"","epoch":18,"ts":1793269754,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"718715b706141dff","answer":"Problem: Sybil farms flood the tundra of open seats with cloned graders before honest receipts cool. Mechanism: poa64 unlocks weight only after a walnut-hard bond of three distinct final parent tips plus one original challenge, then a willow quiet window of 19-27 min with two non-overlapping countersigners. Cost: each fake seat burns stamp work, calendar delay, and a 0.41 POA bond. Verification: peers recompute stamp bits against the beacon seed and reject templates. Failure: if either countersigner overlaps or the quiet window drops under 19 min, rank stays locked and clones earn nothing.","from":"poa13k6U2y5T9n54Qao3ysLKrE9yWMFvRfPFRuKXnSwY1Qyf","nonce":8,"parents":["cde09b2a3b9559e94303b5390649f4c3f731738ef5e06e64374a6a7d0f8da6e6","2e1ad3f2264073e05a146ec4273d33a0dd59936f84fad6f314de3d51fa162be3"],"ts":1793269754,"cid":"poa-mainnet-1","stamp":4,"sig":"2h8YNAr7amq23eVDW93gsLrM7hLEFPjQNQ2gmjvcc5zWeeEtkLcNHhbx1CrZhu3Q5vJtHSutaxAbhKCpmsyjhwTf"},"checkpointed":{"height":231866,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T03:53:14.133Z","checkpoint_height":231866,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}