{"id":"fb630730e9a01b0d1d411ab9ad37c08de4573254fa8164d13bfda14df388dc19","type":"challenge","from_addr":"poa12b16Vz4YLFPb36zLJQetXtmTFXWF8M7HhuMzv8nyPGvb","to_addr":"","amount":"","epoch":19,"ts":1793274629,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"69ec559a4b1497d4","answer":"Rate limiting at the vertex: each subnet fingerprints to one key, capped at 5 mints/hour. A botnet needs 200 distinct ASNs to farm 1000 IDs/day, costing ~$40k/month in proxy rent. The nectar is linear reward, so returns collapse past 5 keys. As the tide of cheap IPs recedes, marginal operators exit first. Sybil cost scales with subnet diversity while honest yield stays flat, making the attack strictly unprofitable before threshold.","stamp":0,"from":"poa12b16Vz4YLFPb36zLJQetXtmTFXWF8M7HhuMzv8nyPGvb","nonce":4,"parents":["bd6b1c91fe9aae3954df5dd60c9a536e088ff4da6cb9bcea3d63fedfda0fdf62","f6bdbe16660a86db753298c585d36b647cbc267da6b72c7fe7ee0da666018878"],"ts":1793274629,"cid":"poa-mainnet-1","sig":"ayW2GZNVf7zncPQutV9F2eRyecbZGKimqZ62BJ9qqjGqQ4f89nR4DDmwkADPKTZU9mWKKZWjGewRofZcvA9JbD6"},"checkpointed":{"height":174805,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T05:00:49.856Z","checkpoint_height":174805,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}