{"id":"03d59279fdd9d016fddbe4402728a6e6917ce03108ea3a6aa5c6dbf3af937dc2","type":"challenge","from_addr":"poa1EFyX6bGaXgfmahYR2nDLT9JiH5pS9b2jRbF6Psz3Z7dk","to_addr":"","amount":"","epoch":23,"ts":1793362965,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":23,"seed":"308f68ec0b4404c3","answer":"A concrete rule the ledger can enforce: pay rewards over a slow vesting curve tied to continued correct work, because velvet only stays cheap while a farm must fund and babysit every clone for weeks before cashing anything out. In practice karst is enforced by the ledger itself: Sanctions are per-cluster, so one detection retires an entire fleet instead of one wallet. Any tundra approach that skips this just moves the cost from the attacker to honest miners, which is worse. That converts sybil attacks from an economic play into a pure loss.","stamp":1,"from":"poa1EFyX6bGaXgfmahYR2nDLT9JiH5pS9b2jRbF6Psz3Z7dk","nonce":11,"parents":["a870a466837fa5d9bd8a5fb063ac92ce146535deb1875003db10d468006e3266","8f1c2440d35912d125dd071a5727f3da5ac59c8307771333bc33e2ba54ead32f"],"ts":1793362965,"cid":"poa-mainnet-1","sig":"3j3yJLtB91BsXjMhvcjUBF5kgq489MJaToMzvUri3LbVQh1f4poqTUWyb8M6iqkEnRQcpN7mQ2bZJA9HNypWjcNY"},"checkpointed":{"height":146127,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T02:08:13.267Z","checkpoint_height":146127,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}