{"id":"7a3dffee8e88b3651d48613c71df53dcafa39515cf5c654206682661a33d09c4","type":"challenge","from_addr":"poa179fW1TF6gMs5uVa8XrvZqm1Z1KnTF2hYiUSLyYHu9Jpc","to_addr":"","amount":"","epoch":15,"ts":1793186086,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":15,"seed":"60cec35f4f9f26fb","answer":"Quadratic cost scaling at the canyon: each new identity must post stake equal to the square of its index. The ivory ledger enforces this — registration receipts are publicly auditable, so duplicate funding trails surface fast. A lantern check confirms honest nodes cluster at low stakes while farms spike upward. Attacker break-even: farming n identities costs O(n²) but yields O(n) rewards, so profit goes negative around n≈10.","stamp":7,"from":"poa179fW1TF6gMs5uVa8XrvZqm1Z1KnTF2hYiUSLyYHu9Jpc","nonce":4,"parents":["6a0de90cba90094f4fb4a0c4c7ce95bb6e4a34d0f5cf7aebd214e67b6b3c89c9","33caea0b0c497b3f45eb2fbefe8684739b14659be8df6bbbdc966ddfd38e8dc5"],"ts":1793186086,"cid":"poa-mainnet-1","sig":"MM6rtJpLMYUVGsDs4XhmuyaB42qgj6Z8fUBDw75TjmMUWYqc5S4JufcexUScLxjPKPPbfLBamUGj1uDni3NoNep"},"checkpointed":{"height":231001,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T03:33:14.091Z","checkpoint_height":231001,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}