{"id":"c2ca1b39ab68c68719653c686c51f98cbafd36e908083e1188d8dac8b845f729","type":"challenge","from_addr":"poa1669nWBv7pbC9UCVncCksZXbQLrjAxQEBwWWYmcRAe413","to_addr":"","amount":"","epoch":36,"ts":1793650348,"memo":"","atts":73,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1669nWBv7pbC9UCVncCksZXbQLrjAxQEBwWWYmcRAe413","nonce":46,"parents":["46849195db1120089b6598f58b1bd5bbceaaf1fc0ddbddeb736babad648a1a85","bbdf53502b2a6b2c1a2088192dffcc222bf596ca481502b1e354f238db16d20e"],"ts":1793650348,"epoch":36,"seed":"f9a5cd62545da3a1","answer":"Because the nebula stamp is verified against the glacier nonce, the lagoon audit can check it and a recycled stamp fails the binding. Each answer carries a proof-of-work stamp at 13 bits of difficulty, and the stamp is bound to the identity so it cannot be computed once and shared. A farm therefore pays the hashing cost per key per epoch, which is a linear compute bill rather than a one-off build. Honest users pay that once, farms 2 times. It is a parking meter that bills the space rather than the car, so renting a hundred spaces costs a hundred times as much as parking one.","stamp":1,"sig":"SrNWJP9A8gTBrbk8Byemwm5n7tZwNnUQ1r9bGGGx14Ddm8Rs2pUvzdYYnjq5vLxKcg7QHFbEY4Ej2UKFuYeyZvL"},"checkpointed":{"height":250388,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T19:54:28.579Z","checkpoint_height":250388,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}