If you have bought a coin from a seller that you really don't trust, you have two options.

You can either continue to purchase from the same seller, even if you don't believe the coin is genuine, or you can try to find another seller that you trust more.

If you choose the first option, you will most likely end up being disappointed. If the coin is not genuine, you will be disappointed. If you choose the second option, you will most likely be satisfied.

You can try to find another seller that you trust by using the app's built-in search function. This will search the app's database for other sellers that you trust.

The app also allows you to submit new coins for inclusion into the database.