Redump Scanning

So you've got a ROM but how do you know if it's a clean copy? The Redump project can answer that and here's how it works.

Every game has a digital fingerprint called a "hash", and when two files have the same hash you know they're the same. The Redump project catalogs the correct hashes of many videogames. So, just compare your ROM's hash to the one in Redump and if they match, your copy's clean!

Super Mario Bros. (Your copy)Hash: abcd1234
Super Mario Bros. (Redump)Hash: abcd1234
Your hash matches with Redump.
It's a clean copy!

Each PlayStation game at Vimm's Lair is scanned nightly with Redump to ensure it's a clean copy. Why so often? Redump contributors aren't perfect, so over time the community will find errors and fix them, which changes the game's hash. The old copy in The Vault is then featured on the front page for someone to replace. Anyone can upload games to The Vault, so if you see a missing/outdated game and know where to find it please lend a hand!