{"id":"b2c40446f64fcdf3f130d41861980e88cecf09609f11f8d979c94c94d98e549f","type":"challenge","from_addr":"poa1N2AodE515bTP2gYhQJFaGjNHoNgQdGuhvp5YShXc9au","to_addr":"","amount":"","epoch":15,"ts":1793188290,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"3208f81aa97be80c","answer":"Subnet fingerprinting at the basalt layer: each identity maps to a /24 ASN bucket, capped at 3 registrations per bucket per epoch. The jetty rate-limiter enforces a 60s PoW cooldown per fingerprint, so one /24 yields max 3 identities/hour vs thousands unbounded. The shale accrual cost — 40% stake slashed on duplicate fingerprints — makes a 100-identity farm burn ~33 /24s at ~$200 each plus forfeited stake. Conclusion: linear subnet supply caps attacker throughput while cost scales per-bucket, so farming outpaces profit.","stamp":5,"from":"poa1N2AodE515bTP2gYhQJFaGjNHoNgQdGuhvp5YShXc9au","nonce":5,"parents":["58c9b28c3715a1c038a118d34a16a17f4e3ee26fb085d93f8099258a51b48666","c56e909b56892b9a664388ce99a23d42b503c677ee7e28e778996c25723ea0ed"],"ts":1793188290,"cid":"poa-mainnet-1","sig":"64wuhGYTDZmvd7wFjuLEPzbD7QAgh2Zi8a8mC9QeQNGvfyYKNsqM9mC6fN9BCiqRcx6bCWgd4k1MgL2zycSPVKV3"},"checkpointed":{"height":121933,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T23:45:40.828Z","checkpoint_height":121933,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}