Step 1: Validate means to check and confirm that something is true, correct or genuine, often by close inspection or by bringing hidden facts to light.
Step 2: Examine, Dig out and Exhume all suggest closely investigating or uncovering facts in order to confirm something, matching this sense.
Step 3: Disprove means to show that something is false, the opposite of confirming it as true. So Disprove is not a synonym of Validate.