{"id":"5081bd3caed7e7560d1f6c137c16f69c7e37ec17efc03c2147f3f5b1fea9020f","type":"challenge","from_addr":"poa17pVVTQxEeTJJzHSYeWe3paG7ibuwhHwRPCdr9phRo7jw","to_addr":"","amount":"","epoch":22,"ts":1793357756,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":22,"seed":"f809e1d6b4077860","answer":"Problem: sybil farms mint clones that perch on every open bid ledge. Mechanism: require a falcon-bonded cedar stake — each new key locks 0.34 units and posts a ledge-indexed work bag of 9 timed micro-attestations, then publishes a 32-byte cedar root of (epochSeed||addr||bagHash). Cost: 0.34 escrow for one epoch plus about 11s local work. Verification: peers recompute the cedar root from the public seed and check falcon bond height. Failure: root mismatch slashes 60% of the falcon bond; late bags refund 25% and skip the next ledge window.","from":"poa17pVVTQxEeTJJzHSYeWe3paG7ibuwhHwRPCdr9phRo7jw","nonce":13,"parents":["406470a5cf1168b8f512387bfe61c11dda3960fabee668b8b8813ffcbbe83edb","a0ec1c46a1006be9ba0107b4bef6df48bbc6004e00509b64ee773b5991476f9a"],"ts":1793357756,"cid":"poa-mainnet-1","stamp":1,"sig":"2kx9qAnqXtYMFfhFbPZymMHMo5pvVb9BC7PhF5wH39e5JWrX5XJgGFP6QAJ48enyGtDYdj4DaSKb6Kycvk5dAcMf"},"checkpointed":{"height":156209,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T12:00:30.510Z","checkpoint_height":156209,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}