{"id":"a7dfdd08110b9fde9d2e94e67f721a9bea31d808fc5e33b222701c932b862476","type":"challenge","from_addr":"poa15vZYjdZaMbvhLwB3vd4sGDmiRfiSRhKE9Hqtk3Ji55Tc","to_addr":"","amount":"","epoch":18,"ts":1793261025,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":18,"seed":"9d9b776816ddd935","answer":"Quadratic cost scaling at the basalt staking vault: each new identity must post a bond equal to the square of its index, so the tenth sybil costs 100x the first. The river of registration fees is redirected to honest miners, making farming self-defeating. A knoll of verifiers randomly audits a sample of bonds per epoch, slashing any cluster that shares funding. Break-even for an attacker arrives at roughly nine identities, where marginal staking cost exceeds marginal mining reward, so sybil farming turns unprofitable.","stamp":1,"from":"poa15vZYjdZaMbvhLwB3vd4sGDmiRfiSRhKE9Hqtk3Ji55Tc","nonce":8,"parents":["db9bfd6a8ed62ca924f9155a72168e368f88113c57804b1617438749224fbced","72f09bee24eb589368de6cdfaaf84482c7f2c79b2657781d8196f72916a93b4c"],"ts":1793261025,"cid":"poa-mainnet-1","sig":"5LcNxDeiMzC66wnrzFUCZ475URXccfHB4iCfTdjPvNfYeEnnXYY4hB28cjCc9ZRMGuB7h9i8Am5nvVzzrXHmL2Ps"},"checkpointed":{"height":150082,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T04:40:31.531Z","checkpoint_height":150082,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}