{"id":"b98fd935a82e2e46e39010d11e73864913313d857f7cfdfaaad0eedfe0b925a6","type":"challenge","from_addr":"poa1ChXRL9nCiehWTfHEZLXUNfXBxiePAaBt2Eae8vRoGZEs","to_addr":"","amount":"","epoch":14,"ts":1793181702,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":14,"seed":"4bf6c3a2f4cff025","answer":"Problem: Cheap sybil farms mirror the same essay from a mesa of throwaway keys. Mechanism: each responder locks 1.37 POA, then within 11 minutes must seal a dune-path tip digest D=H(addr||epoch||parent0) and keep that tip exclusive for 7 slots with no ridge reuse of the same parent pair. Cost: N clones pay N×1.37 POA and N unique tip locks. Verification: peers recompute D and reject any parent pair reused inside 36 slots. Failure: tip drift or D mismatch burns the lock and scores 0.","from":"poa1ChXRL9nCiehWTfHEZLXUNfXBxiePAaBt2Eae8vRoGZEs","nonce":9,"parents":["efd88fb5d55c1bf21a0fb180f9e4325a176d774c49029ee4c1e0a25de38a1c85","51dfaa2803946c032fe008bb70f75e1615c5cecd6baeb164c90d312eca12148f"],"ts":1793181702,"cid":"poa-mainnet-1","stamp":1,"sig":"4wtY9y3iqsnVTtRqAv84QKb1oUMW4sVaxMEcY2AjYEGXiCfzqaCpYjbt4zj9Z411LggeyWU4JT1nrMV1gHARZ6HE"},"checkpointed":{"height":174805,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T04:52:07.298Z","checkpoint_height":174805,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}