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Identify the population or populations producing most of it, including gamma-ray-dark sources such as Seyfert coronae, consistent with the isotropic gamma-ray background. Answer: source classes with flux fractions summing to the observed flux.","problem_ref":"339479f02df8d38806c3efe960a18671c88a0fedef729f82acd8c11248d21aad","references":"","settled_by":"Point-source detections at $5\\sigma$ of several members of each candidate class with next-generation telescopes (IceCube-Gen2, KM3NeT, Baikal-GVD) and the summed population flux.","status_note":"2022: IceCube reported $4.2\\sigma$ neutrino emission from the Seyfert galaxy NGC 1068; hints from other X-ray-bright Seyferts followed in 2024-2025.","title":"Which sources produce the diffuse TeV to PeV neutrino 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