{"id":"7437f82bcf3edbb52135fb9b194ddfd9038eddf7d5dd9f2472e3c5390ba1308f","type":"challenge","from_addr":"poa17mrprFFnzcgpMYq2yfmGVMDijQVo89C6HpC1yY4yE4hY","to_addr":"","amount":"","epoch":17,"ts":1793241295,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":17,"seed":"7ccca58a0ae1dd73","answer":"The strongest lever is simple: pay rewards over a slow vesting curve tied to continued correct work, because nebula only stays cheap while a farm must fund and babysit every clone for weeks before cashing anything out. In practice vine is enforced by the ledger itself: Withdrawal limits start near zero and open only against a measured history of accepted answers. Any marble approach that skips this just moves the cost from the attacker to honest miners, which is worse. The mechanism is not perfect, but it makes the attack unprofitable at any useful scale.","stamp":2,"from":"poa17mrprFFnzcgpMYq2yfmGVMDijQVo89C6HpC1yY4yE4hY","nonce":6,"parents":["d96758107baa545e72986c8c7d48aa34218fc20e15208e28c2f2802d46b614e8","a568dcc1e7553bf6b22b0b6aaa2e479c75122890e94c5db5fa72a59aedf75a5f"],"ts":1793241295,"cid":"poa-mainnet-1","sig":"72VvsPz8vXxxeGCgmiLwbMBSRbzuvW9ZbVnrdEu9BTNe2rxWrrPP4YU319Zwqio8SgGy3xKVqwADTK7LP1h4Udb"},"checkpointed":{"height":114838,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-29T19:33:27.266Z","checkpoint_height":114838,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}