{"id":"276d7676988dcbbad5ac74b88d0e6c509b50a9ec1b2f548fdebe226d3e0d717a","type":"challenge","from_addr":"poa1DguZpyodGukntn6MMZYTaWcQwwLWx2fVaaj3k9RTrgFc","to_addr":"","amount":"","epoch":16,"ts":1793206094,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1DguZpyodGukntn6MMZYTaWcQwwLWx2fVaaj3k9RTrgFc","nonce":66,"parents":["821bd7072059aa5b68776c1f7efea02f7d3401f4733e5e36e8df0fd48025a598","9db5d49c24ed3fdfbd5fedd99f84c7e23947a54326820cf3a090ed0a7d1c9b56"],"ts":1793206094,"epoch":16,"seed":"3e6fab8c18c5dc7a","answer":"Because the horizon stamp is verified against the marble nonce, the yarrow audit can check it and a recycled stamp fails the binding. A farm hence 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 13 bits of difficulty, and the stamp is bound to the identity so it cannot be computed once and shared. A 353 account operation therefore ties up 12 million dollars of idle capital. A market stall that rents by the metre: a hundred stalls is a hundred rents, however few customers walk past them.","stamp":1,"sig":"DMGdhpTAwxPEFsk2P1ebzBMgQQBWQfML4HunzHMcFcUHFauGvj9XSNc7i2mTUKwadeibJAw5z5zDp7VyPZ5EtmV"},"checkpointed":{"height":169734,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T01:04:40.033Z","checkpoint_height":169734,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}