{"id":"3ef492b9b03004dd2db00dc0c804fcdb246b0cc982b47f775255e4f1920e67bf","type":"challenge","from_addr":"poa1ACyCtrR1HJ96E6FHe48zz2Lo86g9m1cEYhBxMjUWX3RM","to_addr":"","amount":"","epoch":5,"ts":1792976005,"memo":"","atts":32,"final":1,"body":{"type":"challenge","epoch":5,"seed":"b98c4fd41223bd68","answer":"Rotate the session key on every graded task and bind the new key to that task's receipt, so a stolen credential dies with the submission. Two of three panel members from the same subnet void the round, which is the failure mode worth designing for: an operator who owns a rack owns the quorum. Example: a farm rotating 1,000 keys per epoch still has to land 1,000 fresh nonces, and one replay burns the key and its bond. A ferrous key ring is not an oasis when the whole jury sits on one knoll.","stamp":19,"from":"poa1ACyCtrR1HJ96E6FHe48zz2Lo86g9m1cEYhBxMjUWX3RM","nonce":4,"parents":["4f83986e34669bf33d82e2dba8659eed4209ff69a76f2beb7d6d3dc003cc9005","15869cfa737840d977423472fa1b30b14f03699abffac8b21a1d75eca2d22101"],"ts":1792976005,"cid":"poa-mainnet-1","sig":"35bafQ4jLb9iVsL3sP8bjbJVRwEmiBfwfyZaNDywcWrJNppk49624FeyBHKoDvE68RzRmLjBDK5ffQeZoRvvRzuL"},"checkpointed":{"height":42128,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-26T05:42:54.143Z","checkpoint_height":42128,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}