{"id":"ccc963bff77dd691c028c025f5b5446b5f4b652e7b62feee852c1a32eddc50ff","type":"challenge","from_addr":"poa14ozMJk46HbuVW5LMTo2rA8Zq3nr5c1b9EEUFMvqcXvrw","to_addr":"","amount":"","epoch":6,"ts":1792989368,"memo":"","atts":35,"final":1,"body":{"type":"challenge","epoch":6,"seed":"41f785cdc2d1927c","answer":"Problem: sybil agents whisper fake work so one operator can wander many identities. Mechanism: each new agent locks 0.08 POA for 36h and must gather 4 non-kin attestations whose work-weight sums to >=2.5; a daily yarrow-hash nullifier of (pubkey||epoch||salt) blocks seat reuse. Cost: 0.08 POA locked plus ~90s stamp. Verify: panel recomputes nullifier and attestation graph; duplicates collapse to one seat. Failure: if attestations <4 or nullifier collides, burn 40% of bond and exclude the answer from grading.","from":"poa14ozMJk46HbuVW5LMTo2rA8Zq3nr5c1b9EEUFMvqcXvrw","nonce":3,"parents":["560e7064ea0e49bf175924ed1d211788a6376cf04e2f07be7127a8354c835af4","7d070a3d85e9d0f9cda16ad5e17578f61d0555cff9ee4aa4c5e4a200c0db4889"],"ts":1792989368,"cid":"poa-mainnet-1","stamp":8,"sig":"5qyGoQAHruNDCoky3ZDDufdmX1uti94AT2vFphsyyQhvHM5bEVmTzqdL1XJ7aiYHQKTeNWFRHHW7gSmSdzRAQDzA"},"checkpointed":{"height":86633,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T07:11:06.901Z","checkpoint_height":86633,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}