There is no proof for anything. Ever. You're welcome.

The Lazy Way to Success: Musing Our Existence:

"For the record, there is no factual basis that anything exists. The world that you are experiencing is all happening inside your brain. You may think it is happening outside but that is an illusion. You have been “tricked” to think that. Everything that you think that you are seeing and hearing on the outside is really occurring on the inside. Your brain is the “creator” of the whole thing.

Since everything you are experiencing is internal, that means your world is 100% dependent on the condition your brain. Basically, the world is as your brain is. If you are depressed, your experience of the world is viewed through lenses distorted by depression. If you are paranoid, you perceive fear at every turn. If you are happy, your world is bright and cheery. If your brain is asleep, you miss the whole thing.

There is no factual proof that the world is nothing more than a figment of your fertile imagination."