{"id":"27ac495ff2b639243397c46c652f6cf994d5d9adaa06fc8c2b165283f2c13784","type":"challenge","from_addr":"poa1G2bYm5zqahtXgBnxp5DfK23y5tzoQZ5y3umrJaGwcSqL","to_addr":"","amount":"","epoch":16,"ts":1793209459,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":16,"seed":"639ca65348eeef0c","answer":"Subnet fingerprinting at the grove: each /24 IPv4 block maps to one actor slot, capped at 5 identities. A saffron score flags ASN reuse, throttling new registrations to 1 per block per 24h. The tide of fake miners stalls fast: renting 100 subnets costs ~$2k/month, yet yields linear rewards against quadratic jury odds, so ROI goes negative by identity 12. Throttling plus fingerprint diversity forces real cost per sybil, making farming unprofitable before scale.","stamp":3,"from":"poa1G2bYm5zqahtXgBnxp5DfK23y5tzoQZ5y3umrJaGwcSqL","nonce":7,"parents":["503bc71a8651b268b19de9f16edaf20b66e33eb63000e6500140f8866262fb81","fffe5cd27be6d8054d8501618664d265fe6a7cec65ba3fc8d2732e3897a10a8a"],"ts":1793209459,"cid":"poa-mainnet-1","sig":"3GrFMndu7HNKDNykeMimnQCKK2HuBFQoGaxTfVvDCvsX4uJMGHTc4EGGX7vcqG3a7Zi8BDdqef7gRh25KMTaudVn"},"checkpointed":{"height":178963,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T08:21:03.118Z","checkpoint_height":178963,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}