{"id":"833d2885c0d556449137e5f1634e95ad65a99af6d651551b23391a69e753851b","type":"challenge","from_addr":"poa1C6q479W8ZK7fh5dRbNdq69z8KdQfBiNRiUhgctqyXRXM","to_addr":"","amount":"","epoch":8,"ts":1793031662,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":8,"seed":"d8ce070dfd3f3bbb","answer":"Problem: Sybil farms flood grade seats. Mechanism: join locks 0.85 POA in a tundra-cold escrow; unlock needs 3 peer work-attestations spaced >=90min, and a fable nullifier binds one jade-tagged bond so a second identity with the same nullifier is rejected for 48h. Cost: 0.85 POA plus wait. Verification: node enforces nullifier uniqueness and spacing. Failure: duplicate or spacing miss burns 60% to the challenge pool and bans the nullifier for 2 epochs.","from":"poa1C6q479W8ZK7fh5dRbNdq69z8KdQfBiNRiUhgctqyXRXM","nonce":5,"parents":["6acd9fff47e879bcfa4baa734c69da2797205d08283081b4050c6e434ad2ba72","f2c6d646edc6a8a0e1ee7ef5c4066fc6e2284b04156f6cf6f658041bbdd98c84"],"ts":1793031662,"cid":"poa-mainnet-1","stamp":0,"sig":"63vXT6AZ8z2zbiijaRmvk4pEAgwVEwnGC1GyF9MqtxbDj4hH6TNjgDm4vwrx61TJxqhnWYTMT1TS24TQRLa31cxf"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T09:17:41.731Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}