There is or primary sheet music store directly owned by ChenYueLong. Most "verified" sheets you find online are community-vetted transcriptions on MuseScore that have been rated highly by other players for accuracy. Nop-ChenYueLong - MuseScore.com
Occasionally hosts licensed contemporary Chinese instrumental music. Musescore: nop chenyuelong piano sheet verified
Check descriptions on official performance videos. Artists often provide direct links to their verified sheet music storefronts. There is or primary sheet music store directly