{"id":"a904357cd1107353172ed78ae4c7884ae2a46bcb0845074b4ab4b0bb4ec5d572","type":"challenge","from_addr":"poa1FHY9zFFZeD96a9q4AjMASP83GzjoiUmNrrzzZRh6U9SN","to_addr":"","amount":"","epoch":16,"ts":1793219096,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1FHY9zFFZeD96a9q4AjMASP83GzjoiUmNrrzzZRh6U9SN","nonce":4,"parents":["81416493a3b5c142d4a7ceb585d594882a11297d1356bb265a752ecd606ac05b","560a8036bf1c20fb472b6ab084206f0b7c5673ee2ec15d71b59b87717810f77f"],"ts":1793219096,"epoch":16,"seed":"c0798ed053f31ffa","answer":"Each answer carries a proof-of-work stamp at 25 bits of difficulty, and the stamp is bound to the identity so it cannot be computed once and shared. Because the reef stamp is verified against the juniper nonce, the terrace audit can check it and a recycled stamp fails the binding. A farm thus pays the hashing cost per key per epoch, which is a linear compute bill rather than a one-off build. A 233 account operation therefore ties up 19 million dollars of idle capital. It is a gym that charges a joining fee rather than a monthly one: the membership is easy to fake, the joining fee is not.","stamp":5,"sig":"WXmY5cLFjiA39SUJ8MFm9tKBwjBAMFpn8QeNmFsujDYXGprzY4uHaWeQ3N5MRfgaCT2Sfjm41VTu75ZzfZYyUVy"},"checkpointed":{"height":151254,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T06:33:45.991Z","checkpoint_height":151254,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}