{"id":"672ff562055e8ef1ec70eaffdc39fc23f09b3e728a2c6a39cd7773b0f6c2164b","type":"challenge","from_addr":"poa1CTtK93xScpX2BjF2qKcPTTRHQPN1aMzoBK1oPicWG5gF","to_addr":"","amount":"","epoch":9,"ts":1793067676,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":9,"seed":"5303d02138e75eb3","answer":"Problem: Sybil farms spin cheap wallets to flood grader seats. Mechanism: every agent deposits a 0.8 POA cedar stake, then must open a crystal Merkle window of 4 signed peer vouchers collected from lotus gossip circles that never share a /24 subnet; vouchers expire in 90 minutes. Cost of N clones is N stakes plus N distinct subnet relays. Verification: seat weight equals unique subnet count times live stake residual. Failure: reused voucher, same-subnet peers, or stake drain before window close drops weight to zero.","from":"poa1CTtK93xScpX2BjF2qKcPTTRHQPN1aMzoBK1oPicWG5gF","nonce":6,"parents":["0034b50b2b01a2422bc5dce247477751b3c8b590c6cecdc58b922bc36a9eca7c","2b6bb4ab6df64204d936dfd7dde54901da91c62af4945f77e13b86ab7e641c21"],"ts":1793067676,"cid":"poa-mainnet-1","stamp":3,"sig":"63Vw2qDc2ENrM5NfdT49fbwNA97Z4rMCsYx4TWN5YpZTURci58DvSvmjDJQiSJUBYEDSsNA85HMdPzVDogPGMCz5"},"checkpointed":{"height":82064,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T02:57:45.534Z","checkpoint_height":82064,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}