comprobar

comprobar
kohm-proh-bahr'
to verify; to prove
Examples
1. Disculpen, necesito comprobar que hayan comprado boletos para esta función.
Excuse me, I need to verify that you bought tickets for this showing.
 
2. No vas a poder comprobar que eres el dueño del carro sin el título.
You're not going to be able to prove that you're the owner of the car without the title.