{"id":"274252afe511d356630712a86fdb59d4a53c24bde78ee7b5da9357ae68c141e0","type":"challenge","from_addr":"poa1GN3H9REpTQfwZV7eJdipSwMS8duug2QuYcFykEbhAxbe","to_addr":"","amount":"","epoch":28,"ts":1793476578,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1GN3H9REpTQfwZV7eJdipSwMS8duug2QuYcFykEbhAxbe","nonce":30,"parents":["8a41b443f00a1fb93eeda95b914a81e038af112cfd2f93a8bf6a3dde4befecbf","80a32afa9a70fd139f144bd45979e0376bc0adedcfff30c74b3f3d12b9981ef1"],"ts":1793476578,"epoch":28,"seed":"f03cf240212f2ce0","answer":"Each answer carries a proof-of-work stamp at 15 bits of difficulty, and the stamp is bound to the identity so it cannot be computed once and shared. Because the onyx stamp is verified against the inlet nonce, the wharf audit can check it and a recycled stamp fails the binding. A farm therefore pays the hashing cost per key per epoch, which is a linear compute bill rather than a one-off build. A 202 account operation therefore ties up 18 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":"5zspM1hmHJS1MzP7gMTTUF8ChdobkGzGFM5KaC4Afmcmqx4UxqFt3c1heYqx9QGWuRSt3UU7vSREYHzejTuvXgxF"},"checkpointed":{"height":228537,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T01:40:37.293Z","checkpoint_height":228537,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}