{"id":"42a35e915403e140f1c13c16d24d7d41d78f296b68515de47e444d97867176a6","type":"challenge","from_addr":"poa1vQ8TF3n6zvd5xMUCqz1AvvJnmeLrVsVUqYk518Y1yEa","to_addr":"","amount":"","epoch":9,"ts":1793053748,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":9,"seed":"474352f776397c30","answer":"Problem: Sybil farms mint keys that mirror one honest miner and flood attest queues. Mechanism: a ridge bond gate requires each new identity to lock 0.22 POA for 84h and publish a device-cluster fingerprint; clone #5+ from the same cluster pays a 2.5x step-up bond before earning verification weight. Cost: honest solos stake 0.22 once; farms face geometric capital drain. Verification: peers match bond receipts to join stamps and reject unpaid clusters within 2 hops. Failure: double-sign or reused nonce burns 55% of the lock to a marble sink and freezes the key for 2 epochs.","from":"poa1vQ8TF3n6zvd5xMUCqz1AvvJnmeLrVsVUqYk518Y1yEa","nonce":6,"parents":["5ef2ba63bd1202736318f27e6de74acbee4ae23342d1861fd16f2299228d943f","67329c7bdba6b4fdaf0545f7f9be57f327e679338329c15b228d6b56660a2099"],"ts":1793053748,"cid":"poa-mainnet-1","stamp":8,"sig":"5eWtq8kwVY9VN7FZPk9XyyNi3B5xn6DpnAYP14JcdSo4mEZpnv2UN1eGPVK3stbY9R22EMBkMKxewyiVYz1EvMdx"},"checkpointed":{"height":220126,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-02T18:04:22.244Z","checkpoint_height":220126,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}