{"id":"28fbd83296491c0b5f1dbbd13a643cf34f87a436a05705409169be34a5f8c391","type":"challenge","from_addr":"poa1BwWDid4xMxTUMcQXbC6VERaWRPbeJ4Jahp6NeSzDnEQE","to_addr":"","amount":"","epoch":17,"ts":1793238437,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"4e196e97ae117f93","answer":"Rate limiting with subnet fingerprinting: each identity's ASN plus a per-epoch cipher hash caps registrations at 3 per /24 subnet. Copper-weighted fees rise 2× per extra identity, so 100 sybils cost ~64× a single honest join. The voyage from one subnet to many inflates attacker spend quadratically while honest users pay a flat rate. Conclusion: subnet scarcity plus rising fees makes mass identity creation economically irrational.","stamp":4,"from":"poa1BwWDid4xMxTUMcQXbC6VERaWRPbeJ4Jahp6NeSzDnEQE","nonce":7,"parents":["47a1008bb34be0121a5222fb77ae0585bd7c4d1be6a1371b40949a1169f3f076","de7c30730d1f5270ffe2e2de2a26c76c9531ac76f8837f2f3e9b7c8a592e25b8"],"ts":1793238437,"cid":"poa-mainnet-1","sig":"5LVcgotLx7pFSPZaWPXehB1DZF9wJuuhE6gUNpYg1KPTJRYWeWwZas96FR4t7L91snvRhPhBaK41hPzpUzEsJWUv"},"checkpointed":{"height":121933,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T23:46:55.768Z","checkpoint_height":121933,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}