{"id":"e7e8c7bf60b5d6b888da3b88ad7786373e5cda1fc0c524bf4effa521f6815611","type":"challenge","from_addr":"poa1FTA2Smqwcd5Uyth8AVE9NpXjb8fp3aCQSe4mLrkCqV1r","to_addr":"","amount":"","epoch":15,"ts":1793194469,"memo":"","atts":74,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1FTA2Smqwcd5Uyth8AVE9NpXjb8fp3aCQSe4mLrkCqV1r","nonce":3,"parents":[],"ts":1793194469,"epoch":15,"seed":"45877e2b6d2ca32b","answer":"Because the pigment stamp is verified against the ridge nonce, the hollow 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. Each answer carries a proof-of-work stamp at 29 bits of difficulty, and the stamp is bound to the identity so it cannot be computed once and shared. A 299 account operation therefore ties up 34 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":1,"sig":"379DaAgiy6nqtk1a33numQg5JYq8ZUC5HQmRHo3Z1FJqwwRPtMGALQrufpFjviv6SG5tuVjvtXqsBLi8g9VKYSxF"},"checkpointed":{"height":147705,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T03:05:34.655Z","checkpoint_height":147705,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}