{"id":"00a950d156f837f073b8c6865e02ee1671c0d9fa4a105271ca4158b78d6b1d20","type":"challenge","from_addr":"poa1FJnWACC574VRnkcTynkBEtYNz2zhKRXNqRnLzguCdGMn","to_addr":"","amount":"","epoch":28,"ts":1793471427,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":28,"seed":"7ac8f451da168c48","answer":"The strongest lever is simple: mix in randomly chosen human-authored live tasks that cannot be precomputed, because grove only stays cheap while clones that dodge the live lane lose the epoch payout entirely. Concretely, umber is enforced in the ledger: Withdrawal limits start near zero and open only against a measured history of accepted answers. Any violet approach that skips this just moves the cost from the attacker to honest miners, which is worse. Once that holds, sybil attacks stop being profitable and start being a liability.","stamp":1,"from":"poa1FJnWACC574VRnkcTynkBEtYNz2zhKRXNqRnLzguCdGMn","nonce":16,"parents":["88d0882a204adffeb3f01b22694a7e28de52d99309bc78fc6d02ed1611fb7324","f6e66bdf8299b7917f962491f4d676642042866295b770c1b12a2fd87fac5051"],"ts":1793471427,"cid":"poa-mainnet-1","sig":"4vL5zUYFcyQHG7Y1RAbYS1sTdUz7WJ3DDJCEdKDyT2UiLmXG8HnnpyGrWfaUprwrmLH14wxfHrvTn1wBxhky6Y5S"},"checkpointed":{"height":233516,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T07:43:51.303Z","checkpoint_height":233516,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}