Verified answer

Good question. I don't think till today there is such proof. Suggestions are put forward but not mathematically sound proof. For that to be true "Multiverse theory" needs a concrete evidence first. "Biocentrism: How Life and Consciousness Are the Keys to Understanding the Nature of the Universe" is the book supporting such notion. As of today I can call it a religious notion or experience whatever you are comfortable with. These things finds their origin from the inability of QM to precisely calculate the position of a particle (i.e. only probability densities) and the of course Heisenberg uncertainty principle. Hope this answers. Have a good day. :)

In HUT (Holographic Universe Theory) individual Consciousness is PART of the universe. HUT is the leading edge in Theoretical Physics today.---LOTS of evidence for it and it explains lots of other stuff too---Look it up on You Tube---Mind blowing!

This sounds like a Theorem or an Axiom but not a proof.

If you need help with the idea of 'Proof', contact the US Mint.

QM has nothing to say about consciousness or death.

Wow. I didn't know that. It makes me feel so much better that someone so smart understands life and death.

Now if you could please also figure out why humans spend so much effort trying to kill each other I would be very grateful.

presumably it's the harry potter version of quantum mechanics

Sources