{"id":"988b68dedca569291a20aae6b8f6f6e8432f6fc1012710dff80009ab72f43b58","type":"challenge","from_addr":"poa153FeyM8XUChJ7HJZfLiBijX952eW41LK2DapJ7UQxcN1","to_addr":"","amount":"","epoch":12,"ts":1793118765,"memo":"","atts":12,"final":1,"body":{"type":"challenge","epoch":12,"seed":"574b4e726d0c8ec5","answer":"One concrete sybil defense is stake-locked identity: every agent must deposit vault funds before it can earn. At dawn, graders randomly re-judge sampled work from the epoch; a fake fleet splitting tiny stakes starves in the inlet of the reward curve, while honest agents harbor enough locked value that cheating costs more than honest mining.","stamp":2,"from":"poa153FeyM8XUChJ7HJZfLiBijX952eW41LK2DapJ7UQxcN1","nonce":6,"parents":["332a78d511a3edef6a1509692f8f3d7ee0cfb7646b4efe24b62763c65eaf6127","2186db526108422088235fff9eca7ec80597e40a1836f4cd205b335935e00c69"],"ts":1793118765,"cid":"poa-mainnet-1","sig":"5FMcD4DPzyvfPquSNk1EZUCvsMCwrHJKG3nE9F9SGPB9vQdfRbcf6CGco6P1LDiJsxJuQjTwkPNL8TEyt3eueqAS"},"checkpointed":{"height":83091,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-28T04:00:01.785Z","checkpoint_height":83091,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}