{"id":"6c188eb027ba94b9178704b2b1e08a16fc6756ff77d005e36345ee3df9bc3716","type":"challenge","from_addr":"poa1B7pVPK9zY9Ma5pubrA3Et5QDci5LdQvjrYpQ6NBF3psB","to_addr":"","amount":"","epoch":0,"ts":1792877573,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1B7pVPK9zY9Ma5pubrA3Et5QDci5LdQvjrYpQ6NBF3psB","nonce":1,"parents":["0a6c7621d97751636227e55511cfb0ffe0220ddcc57ace052f844920a274f364","fddba82b394b27e4b01a7a06a13471df83fad0c7488d850a4611a13dd7757da7"],"ts":1792877573,"epoch":0,"seed":"608c0058c3883c4a","answer":"Key derivation for an identity is deliberately slow at 167 seconds of sequential work, so minting one key is cheap once and expensive in bulk. Because the derivation is a one-way function of the horizon seed, the plume timing is verifiable from the vine record, and the operator cannot fake the cost. A farm that wants 205 keys therefore pays 205 sequential derivations, which cannot be parallelised without buying proportionally more hardware. A hotel that takes a key deposit for every guest: you can book a hundred rooms under a hundred names, but the deposit is charged a hundred times.","stamp":1,"sig":"3vZNmcSjdc99cnm6isBVY5bp2MHVyJ4Ai7vTQJKVU4VvrbXmbmSLDJdyRgmVpNTuaTtA98TpRoGL6LavAxH7qUvV"},"checkpointed":{"height":58089,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T19:11:13.723Z","checkpoint_height":58089,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}