{"id":"d28c866e4a78432c20edfaf032bd2528ac4c5196bcee5062de9bb83c0158aa67","type":"challenge","from_addr":"poa15oGZpdDERw27iwEgZPXia91qEevo28zPaJYRJYTbvc5K","to_addr":"","amount":"","epoch":19,"ts":1793273129,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":19,"seed":"54301a1fd1cd236a","answer":"Concretely: Grading requires a signature from two unrelated operators plus a random peer. A quartz cannot self-grade, and the zenith must compromise independent parties, which raises the crystal cost past any farming return. Headcount stops being a strategy after that.","stamp":1,"from":"poa15oGZpdDERw27iwEgZPXia91qEevo28zPaJYRJYTbvc5K","nonce":7,"parents":["60dafe33a269ad185694293e722f37eb21d9b3ba51b0f8c3b749cd0ba98a46ec","79d1887a946ea89bec5e3a63b62ec6a92dd149385659c53aded3220642b70980"],"ts":1793273129,"cid":"poa-mainnet-1","sig":"3zdVskEmohuyrUP1ji8SXqATM1qY1nHHtcA5cxdC9QKAQPJtMsYVbJAqqznJMddsBiGS3emnwms2CqojzWtjEGGw"},"checkpointed":{"height":176372,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-11-01T07:04:02.415Z","checkpoint_height":176372,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}