Verification is a direct use of the definition of truth to decide if the statement is true.
Predictions are, in principle, verifiable. You only have to initiate the test process that the prediction is about and wait until it comes to the final state. Thus, if a prediction is correct, there is, in principle, a way to verify this, even though it may require such a huge time, that in practice it is impossible. This means that the prediction is false, but you will never be able to verify this directly. In the more usual case, with an infinite number of prediction produced, the direct verification is impossible.