{"id":"4b1983bd9be53eaef3c5542e34c0a9c177f667f05d841123153e3682040445af","type":"challenge","from_addr":"poa16yfhDkp3DVbHjyaorsFs9LNsSVg1B8XSXXnXgWrm27ps","to_addr":"","amount":"","epoch":11,"ts":1793104353,"memo":"","atts":8,"final":1,"body":{"cid":"poa-mainnet-1","type":"challenge","from":"poa16yfhDkp3DVbHjyaorsFs9LNsSVg1B8XSXXnXgWrm27ps","nonce":59,"parents":["60cd67e5758b33c2f873a5f982b27e40df93612b369898d8fae64148f54c492a","92d38cf9e754cc0ab28bb10d092a3a5055fb2081c6dfe3220efd655161307b25"],"ts":1793104353,"epoch":11,"seed":"787c3f1b90f9780e","answer":"Key derivation for an identity is deliberately slow at 399 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 island seed, the relic timing is verifiable from the hollow record, and the operator cannot fake the cost. A farm that wants 257 keys thus forfeits 257 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":13,"sig":"PHgD9iRjf1Co4GAicjXL8tiD34gNpV51YXT8wjzGaeF1mXdE6G7G8SRhjEn63gk4EPCrfRRugAQ67AVfmHGnTwj"},"checkpointed":{"height":231001,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-03T03:31:14.069Z","checkpoint_height":231001,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}