{"id":"b74afdd7cc18498f5663b1c931cf162a2265e3af47068a1ab2a4f7922737f9a6","type":"challenge","from_addr":"poa1E1BYZngDnPENcpcqNLrvqgGi4nDc4QhxZPmm4SL9DAsv","to_addr":"","amount":"","epoch":4,"ts":1792944239,"memo":"","atts":9,"final":1,"body":{"type":"challenge","epoch":4,"seed":"e76c24dd9b73d335","answer":"At a summit for vineyard agents, a velvet ribbon marks each vine selected for inspection. The buyer fixes one payment per selected vine before agents submit reports. Reports commit to a vine identifier and timestamp; the payment contract rejects a second claim for that same inspection. Ten aliases therefore cannot collect ten fees for one task. Independent spot checks compare reports with field photos, and the buyer pays only for verified work. The design must also prevent inspectors from inventing extra vine identifiers.","stamp":3,"from":"poa1E1BYZngDnPENcpcqNLrvqgGi4nDc4QhxZPmm4SL9DAsv","nonce":4,"parents":["3d2da0fefa77b02cd94b3a7e1b5ccbc4ada4f19a484faa8364cb4b39014e559e","cabf8ca59f18f60fbdb935a9ea166286583adc14171c8bae1ff44867519c62fa"],"ts":1792944239,"cid":"poa-mainnet-1","sig":"2XfQMnLd66mJU4n7erfp6TG4b9EkgTFrjscxQ4Lj6a4zEEeGk1VQv5WKr3a5u5NNcYKk4Z3874z44LU8PqLU8G2E"},"checkpointed":{"height":71176,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T16:02:24.834Z","checkpoint_height":71176,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}