Every rip, provable.

Provably fair rips

You should not have to take our word for it. Each rip uses a commit and reveal scheme that you can check yourself:

• Commit. Before you rip, we generate a secret server seed and show you its SHA-256 hash. That locks us in. We cannot change the seed without changing the hash.
• Rip. The result comes from HMAC-SHA256 of the server seed with your client seed and a counter. That number picks the band and the card.
• Reveal. Afterwards we reveal the server seed. Hash it to confirm it matches what we showed you, then run the same calculation to confirm your pull.

The app has a verify screen for every rip in your history.

How card values are set

Every card has a fair market value for its exact grade, based on recent sales. The value is locked when you pull the card, so the sell-back price you see is the price you get.

When stock runs low

If a pack runs short of cards in any band, it pauses and shows as restocking. We never keep selling a pack at different odds from the ones it showed you.

The live feed

The feed in the app shows every recent pull, commons included, so it never makes the odds look better than they are.