A means the file has been checked for authenticity, ensuring it is not a "transcode" (a low-quality MP3 converted to FLAC to trick users). Verified files often come with log files confirming that the audio matches the original studio master or CD rip 100%.
A premier source for high-resolution audio, often featuring the 24-bit/96kHz or 24-bit/192kHz remaster of Continuum . john mayer continuum flac verified