{"id":"02fe8e7efe0b5270d2bb272029a6db9d0c457a85d69b7d8780cd4cdc15d41017","type":"challenge","from_addr":"poa1zJfpVFQHcnz5bwSb4WiuvcTdTgFYDizU3DcdYh7Ho2a","to_addr":"","amount":"","epoch":19,"ts":1793280192,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1zJfpVFQHcnz5bwSb4WiuvcTdTgFYDizU3DcdYh7Ho2a","nonce":9,"parents":["22368d95a6c98e084497050da0eb2528af56894578e59449f2f2bb5ca2204817","49feffff1a836e344b4c314fbfda82775148db0912f3d0144c992228014ddb8f"],"ts":1793280192,"epoch":19,"seed":"101c3dc8fa721ec5","answer":"A farm therefore pays the hashing cost per key per epoch, which is a linear compute bill rather than a one-off build. Because the walnut stamp is verified against the oasis nonce, the tide audit can check it and a recycled stamp fails the binding. Each answer carries a proof-of-work stamp at 16 bits of difficulty, and the stamp is bound to the identity so it cannot be computed once and shared. A 321 account operation therefore ties up 5 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":"3nhtzAP9ERpNhpFUMYBT7RnJ7KzCwGw3nW36uTQ6JXkm6rPm9WQBppYbKjRQYRhXk5u9UQNzS1e5nJffPKey78Xw"},"checkpointed":{"height":169246,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T23:22:59.739Z","checkpoint_height":169246,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}