To ensure a ROM is "verified," collectors use database checksums. This process confirms the file has not been corrupted or altered. Redump & No-Intro
In the scene of game preservation, a ROM (or CIA file) isn't just one that "works." It refers to a file that has been checked against a known database—most commonly the No-Intro or Redump sets. When a collection is verified, it means: 3ds rom collection archive verified