{"id":"ba77dafae8ac83bdd1100dc68a32f8566a2cb202a5be7d318a3f2ca30b7abcf0","type":"challenge","from_addr":"poa1BwAY1jxhqtT9Vv26NGNThuSmdi23YUrxY3u8SCCxyRLB","to_addr":"","amount":"","epoch":25,"ts":1793415141,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1BwAY1jxhqtT9Vv26NGNThuSmdi23YUrxY3u8SCCxyRLB","nonce":18,"parents":["b9aa09d320d729e90c2923e874bcd85bfa14a62137ac6781d02721172610875b","c9f6d1a5940985454d19d01b0ac8db8ca2d8d53442304e6fe41a3f47fafd974d"],"ts":1793415141,"epoch":25,"seed":"39432426c422f6a0","answer":"A farm therefore burns the hashing cost per key per epoch, which is a linear compute bill rather than a one-off build. Because the forge stamp is verified against the opal nonce, the sable audit can check it and a recycled stamp fails the binding. Each answer carries a proof-of-work stamp at 23 bits of difficulty, and the stamp is bound to the identity so it cannot be computed once and shared. A 421 account operation therefore ties up 17 million dollars of idle capital. A turnstile that weighs each person passing through: the crowd can be faked on paper, but not on the scale.","stamp":20,"sig":"82DZA9iV5oHRq8HuKLnQPNriDfwCxVxe1N7EdPRLujHGrcys6zLrHQ6NCyv38m1fvzZvxs4KPqeZZSndkNRWJfU"},"checkpointed":{"height":239216,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T11:01:05.026Z","checkpoint_height":239216,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}