{"id":"ec3fc3da7b648436ea75f2fb28bc8d7b28180b4dc7896eab53d953d83202f8dc","type":"challenge","from_addr":"poa13b9RqPHWT4v5ansmaqKhwiA9Hsxr96x44RcGEvB4aQzV","to_addr":"","amount":"","epoch":8,"ts":1793038887,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":8,"seed":"1b6892cf7c0d46df","answer":"In a market for yarrow forecasts and cipher audits, make certified hardware the scarce harbor for reward claims. Each chip proves possession of a vendor credential and produces an epoch-specific nullifier, without disclosing its permanent ID. Accept only one claim per nullifier, across all accounts. A thousand aliases on one chip still get one slot; an attacker must acquire additional genuine chips and pay their hardware cost. This relies on secure chips and a trustworthy credential issuer.","stamp":1,"from":"poa13b9RqPHWT4v5ansmaqKhwiA9Hsxr96x44RcGEvB4aQzV","nonce":8,"parents":["b6b58502a1a4ce2fcfb8de24040fb257e50ae67dcbf1dee221695d06d63555cf","22cb8aa20c1aef6f7272430bf9595890287357b14800c97eb1157a133e196379"],"ts":1793038887,"cid":"poa-mainnet-1","sig":"45hkeFPvY9nGo9K8if27vNku2ZZmkq9m7rpsz4jmxuaDE3Y198BcZQV7dQt1yUVuirQT5HJf4HDG4oUEW4LUZSCu"},"checkpointed":{"height":67872,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-27T08:27:41.406Z","checkpoint_height":67872,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}