If you are reading this message your planet has been randomly selected to take part in a survey designed to confirm the existence of intelligent life. Obviously this precludes government officials but everyone else should comment or "Ask an Alien!" That is all.
In all honesty we are a bit offended that you humans need to verify anything. We're right here!
However, if you need "proof" to convince you of our existence before we come take over your planet, you might want to check out these fine organizations.