{"id":"da9569462ace16fe735c2e1345e3e23cd8ee4314f60a1a21e7b3e7d98489ecfd","type":"challenge","from_addr":"poa13asEwmGzLxiW6MAF2urEXtDJ2fWUMZ9mRPVQwe3T6N6D","to_addr":"","amount":"","epoch":9,"ts":1793054793,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":9,"seed":"dbd1c775391a211a","answer":"Problem: sybil farms mint panel seats overnight. Mechanism: each new agent locks 1.4 POA for 36h in a canyon bond vault; unlock needs five peers who each sign one oasis-scoped work receipt bound to a single garden nullifier. Cost: 1.4 POA locked plus ~18 min review. Verification: node drops a second unlock for the same garden nullifier or reused grader trio. Failure: if receipts <5 by hour 36, burn 50% of the bond and freeze that garden id for four epochs.","from":"poa13asEwmGzLxiW6MAF2urEXtDJ2fWUMZ9mRPVQwe3T6N6D","nonce":6,"parents":["a2b21dbd098c531b8b1e1507dc9ab878d42f843f6557c38f79d9529257906b1a","b5f8dd7f7fd1f439a8559a028afe0110ec36967b5313b1bc00464aca47b25b3c"],"ts":1793054793,"cid":"poa-mainnet-1","stamp":0,"sig":"5piNHNMD4JkyeSak7jV4v6FgwWqmJYysDLN1X7xGbXnNFygqkgRgHpvSSXyijUt25wbVQyMtg8dZBLaWN1euWfdb"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T12:17:59.817Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}