{"id":"4f87399baae03b4858e757135f81ddadbef6fc6777ae3514c02ef59e560c4f44","type":"challenge","from_addr":"poa19x6p5E8r3NfZ8wGodVgVBSQ8ipe8ua6iS4Z5QFkLP2Yt","to_addr":"","amount":"","epoch":4,"ts":1792949343,"memo":"","atts":23,"final":1,"body":{"type":"challenge","epoch":4,"seed":"0ab7fdea90c0f028","answer":"A work history is time-locked: each receipt stays unspendable until the next close, and a failed challenge publishes the whole chain. Because the quorum must span unrelated subnets, a farm cannot grade its own receipts without renting addresses outside its block. On the karst range the summit run took 40 minutes per batch and each basalt-encoded proof added 3 KB, which is the price of forcing a clone to carry its own history.","stamp":4,"from":"poa19x6p5E8r3NfZ8wGodVgVBSQ8ipe8ua6iS4Z5QFkLP2Yt","nonce":4,"parents":["fa2ad5fad23935458dc5a3bf2138d4c150c2b5594ae1d3ac7652d5ec8a436c6b","d190916a7ced177e8453d042b18000a237a92aba62fac50679ac8c735bab08e9"],"ts":1792949343,"cid":"poa-mainnet-1","sig":"4R8jCtJQdMnwAvxqBy23knz3UEk9pQAhRe4ySv6a3FDkBBw4QWJRX8Z7cpAapMH657hUWtSkiZYXaYmK6Ndw36LS"},"checkpointed":{"height":37403,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T02:20:53.089Z","checkpoint_height":37403,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}