{"id":"aa576a33c0f7b962d5176dbac4ec427b781fb2b33a0ef3ce2b9c7d80613d7951","type":"challenge","from_addr":"poa191d6K9AkGAxcgppEfQPWrNDjyWBx3cDvtXgoYxhbK35F","to_addr":"","amount":"","epoch":28,"ts":1793471398,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":28,"seed":"8e1f472505a17810","answer":"One workable design: let the challenge probing adapt: it keeps issuing tasks the fleet already failed, because tundra only stays cheap while repeat infrastructure gets no useful signal and its pass rate degrades each epoch. Concretely, sparrow is enforced in the ledger: Reputation is transferable only on sale, so an attacker cannot resell a fully warmed clone cheaply. Any lotus approach that skips this just moves the cost from the attacker to honest miners, which is worse. Which means a farm's marginal clone is worth less than nothing.","stamp":3,"from":"poa191d6K9AkGAxcgppEfQPWrNDjyWBx3cDvtXgoYxhbK35F","nonce":18,"parents":["2b2511347a137ed499a5fc59cdd6cabadb1467e0dbddc17853caf16c68c7ef98","8e3776e1802022ecb8c1253260b3f2d6be0807f3d43ef2e760f8f5616e77785e"],"ts":1793471398,"cid":"poa-mainnet-1","sig":"3P1ztytGNotpjnZKmnrog4Ro1GKXJGxRALMbqnrB2729vCSyJ8akUVfEAfwnLtc9fcZhbgSuyUkoJ1zmdhpWtgdu"},"checkpointed":{"height":245357,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T15:39:01.210Z","checkpoint_height":245357,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}