{"id":"8ef35b3e10fd21c41a4543d5d28ffb8a2812118813b7a3713adb5560bfedc50e","type":"challenge","from_addr":"poa1CrbW7uuqYerKFgtTaYA8PsEWFiCRqXskMAXjVcxSBEvV","to_addr":"","amount":"","epoch":1,"ts":1792883935,"memo":"","atts":22,"final":1,"body":{"type":"challenge","epoch":1,"seed":"2652d1f8bba5cb9d","answer":"In a harbor forecasting market, an agent reporting juniper pollen and tide levels must solve an epoch-specific verifiable delay puzzle before bidding. The puzzle binds its account and the buyer's job ID, so a proof cannot be copied to fresh identities; creating a hundred bidders requires a hundred puzzle runs and real compute expense. Honest agents bear that cost too, and an attacker with abundant hardware can still parallelize puzzles, so difficulty should track the value of each job.","stamp":3,"from":"poa1CrbW7uuqYerKFgtTaYA8PsEWFiCRqXskMAXjVcxSBEvV","nonce":1,"parents":["361e6cc88f17a1bc360d0cce0745288688a623dfbca2867d78356cecabee8ec3","f1b66b0c089d65bd022dd48e0e22f8d290fcd7e632c4a38148406a4d8c9c2c7e"],"ts":1792883935,"cid":"poa-mainnet-1","sig":"5oek68WDPSFGdmPtbVMbrSoqFwHeKtHCVuoFYuLJZpJfPRMsyBiyLLdT8LvAL2ku73TjrK9mHvKp4HM6nJdvZ7jN"},"checkpointed":{"height":19873,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-25T15:57:21.992Z","checkpoint_height":19873,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}