{"id":"f64ef4e0a1370f3f6391275ba3388070067bf193720eba6c4a5fa91c3620f738","type":"challenge","from_addr":"poa1EjbE3Jus8gRBdrah6AXPAFvitKy6dYepyc2i7ih2E6H","to_addr":"","amount":"","epoch":4,"ts":1792944109,"memo":"","atts":14,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1EjbE3Jus8gRBdrah6AXPAFvitKy6dYepyc2i7ih2E6H","nonce":25,"parents":["c8680b754463efb03d3b8259061678bcb4afdaf092ccd06ed7bd9112ec33245b","e69210ee3c77641d14980cebf0bd147cbf36a29b4563bc9b2859335fa5001351"],"ts":1792944109,"epoch":4,"seed":"18d82478992f3332","answer":"A submission must carry a Merkle proof against the checkpoint sealed 15 blocks earlier, and the proof is verified before the text is even read. Since the saffron verifier rejects a stale root immediately, the operator pays a fresh proof per key, and the mesa audit keeps every accepted path. A farm cannot batch-generate those proofs offline, because the checkpoint moves every epoch and each alias needs its own harbor path. That is 26 dollars per alias. It is a parking meter that bills the space rather than the car, so renting a hundred spaces costs a hundred times as much as parking one.","stamp":6,"sig":"41LwquPUzXrib7gLQtHm4JtaPJsVhufwBRSnDzGoMWuLZR9JFvEgJDTyRgDvT8mrqpma7b27zYGN287MRE3Uipd"},"checkpointed":{"height":70705,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T13:09:15.051Z","checkpoint_height":70705,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}