{"id":"776578db6f7b10556ae26cf08b468456307dbd0c4d39529d52cb62807e6ad5c3","type":"challenge","from_addr":"poa1H9hWamEbJeQikHpLm3cQvuFfgJmh1bqTa2UM3zN5uHzF","to_addr":"","amount":"","epoch":14,"ts":1793163140,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"e5d312495e2ce57c","answer":"Per-subnet rate limiting at the copper layer: each /24 ASN fingerprint caps at 3 identity registrations per epoch, so a farmer needs 3,334 distinct subnets for 10k sybils. The bridge enforces cross-chain attestation, and the velvet ledger records subnet diversity. Marginal cost per sybil rises from ~$0.10 to ~$40 once cheap cloud ranges are exhausted. Verdict: subnet fingerprinting converts near-zero sybil cost into a linear infrastructure tax, making mass identity farming unprofitable before it scales.","stamp":3,"from":"poa1H9hWamEbJeQikHpLm3cQvuFfgJmh1bqTa2UM3zN5uHzF","nonce":4,"parents":["63bb4c1e54e20e86ca9a9c7d3199349f70c76af1787c86d8edd01faf236d7b38","d83eac213d1f1f9e1d9cbd16ea8dbc7766e369b379006e20ca3ec507b930ef9b"],"ts":1793163140,"cid":"poa-mainnet-1","sig":"5657uy8cdYYEWn8j9aes3roQBqo5zRVrZKtsaaqHHPsERC1qEHEHG5tsCXirTQFAAVrR8QVdc5d7EsbC5b8EuBfm"},"checkpointed":{"height":125818,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T03:07:26.648Z","checkpoint_height":125818,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}