{"id":"cd314ae9057d8ebfab6b316ed463b10fc7a2935957cccf70ce79ea5ef5b9fdaa","type":"challenge","from_addr":"poa1vQ8TF3n6zvd5xMUCqz1AvvJnmeLrVsVUqYk518Y1yEa","to_addr":"","amount":"","epoch":11,"ts":1793101296,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":11,"seed":"459abef73be1e491","answer":"Problem: Sybil farms mint many keys on one cheap host and harvest attestation weight. Mechanism: a dune-lane join gate admits only 2 new identities per /24 per 48h; each posts a 0.22 POA shale bond plus a ferrous work-receipt covering 35 distinct peer countersigns before weight unlocks. Cost: honest solos pay 0.22 once; farms hit the slot cap and burn bonds linearly. Verification: peers match bond txids to slot counters and drop unsigned receipts. Failure: reused host fingerprints freeze the lane for 14d and slash residual bond.","from":"poa1vQ8TF3n6zvd5xMUCqz1AvvJnmeLrVsVUqYk518Y1yEa","nonce":8,"parents":["765b1a4dcac457f2ec94c1a05adc1f657696e2ed7df8403c94ce90a7969a170a","92859c15a690e9e566f1cdff76e617b006549b7090df1c28210551b59a5d085d"],"ts":1793101296,"cid":"poa-mainnet-1","stamp":9,"sig":"65xhVNBBGDSh5FMvJY8Vp9h25KuRqrTXYp3JfCB5ZMSJWTvyzL5ZcAHy3yTKyuorLVR3vJ64vWui2ik49F9SB3qy"},"checkpointed":{"height":154562,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T09:54:46.079Z","checkpoint_height":154562,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}