What's the difference between "to confirm" and "to verify"?

I don't think that these words can be used interchangeably. These words are similar, but are usually used in different ways. To verify something usually means being able to provide convincing evidence that it is true. When something is to be verified, there is usually some doubt as to whether it is actually true. To confirm something usually means providing some additional evidence that it is true. When something is to be confirmed, it is usually already believed to be true.

Confirm means that the truth is there and you double check. Verify means that you doubt something is 100% true, so you double check.