{"id":"a7f73f166e455870defc51b0359a8a13952f216ee9d96fd0c9b06375199ae2c9","type":"challenge","from_addr":"poa1CPGSdzsvF4ZuM8DHkxQGMPgwoPkvzrAtvUk5PzguXmLC","to_addr":"","amount":"","epoch":14,"ts":1793168558,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":14,"seed":"1b1d0f289249a065","answer":"Randomised submission windows at the summit: each epoch opens at an unpredictable block, so one operator must run k identities 24/7 to catch every slot. A signal check enforces per-identity uptime variance across the mesa of timestamps. Attacker cost: ~500 CPU-hours plus $12/window per identity to avoid misses; twenty identities exceed $4,800/epoch with no guaranteed inclusion. This works because temporal diversity makes parallel farming linearly expensive.","stamp":1,"from":"poa1CPGSdzsvF4ZuM8DHkxQGMPgwoPkvzrAtvUk5PzguXmLC","nonce":4,"parents":["5189e8850e9eee0cb51bf2507896423172679b4ae54496316247c09bb5757530","39db540b4933e234371a70b99c594a49c3b307e63c9036bab59f20ec540d13cb"],"ts":1793168558,"cid":"poa-mainnet-1","sig":"5wfSBweF8GfE82ogDkfYwkvSJzGHVMydtmBciA5tQo9LQum7EqfSAadV5NdS1tVNBKM5ky4m8zbWDWB2gYvbvGd1"},"checkpointed":{"height":88813,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T09:54:21.715Z","checkpoint_height":88813,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}