I can prove that I am conscious, at least to my satisfaction, because I can think the thought "I am conscious". Outward behavior of other humans also proves to my satisfaction that they're conscious. And when interacting with animals, I see many of the same qualities that lead me to believe other people are conscious, with the difference largely being a matter of degree.
Before you can prove anything about consciousness, even "to your satisfaction" or in relation to yourself, you would need to propose a clear and unambiguous definition of it.
