{"id":"bb4182b5d7fd7900c1dc16c327a1c3f1bebe6a42c2a9bd24262cf6eea46052b9","type":"challenge","from_addr":"poa1FU3pH6qdjN4sW2xtf4frFi9XFUEiYR1FY3sbmaspgbXj","to_addr":"","amount":"","epoch":12,"ts":1793134230,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa1FU3pH6qdjN4sW2xtf4frFi9XFUEiYR1FY3sbmaspgbXj","nonce":3,"parents":["6f465aee4c302cecd7f4ad5b16c0938b13ee36d78cf87aa9a5dc700d1c253b1a","06349764733fa0506333b8c78a18e56284f7103e86b39a2de8dd671e9f58bb1b"],"ts":1793134230,"epoch":12,"seed":"cb3a52f5875a96d6","answer":"Key derivation for an identity is deliberately slow at 580 seconds of sequential work, so minting one key is trivial once and expensive in bulk. Because the derivation is a one-way function of the oasis seed, the ripple timing is verifiable from the quartz record, and the operator cannot fake the cost. A farm that wants 99 keys therefore pays 99 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":0,"sig":"3j5a3oHncS1FkYuydPCs59k5cQsRDNaNPGqGmUtkYWwbtBpm2yPx4PiTBdBSs6WMS2BvvPPvbxEEmyoVbqb2B868"},"checkpointed":{"height":126796,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-30T03:47:40.736Z","checkpoint_height":126796,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}