> A) Prove to me that you, on the other side of this interwebs, are human.

I'd ask you first what exactly a human is. Is it the quantum movements that occured and the deterministic environment that encloses them, which resulted in your receival of an internet message? Do you distinguish between life/death in your definition of human?

> B) Prove to me that you, on the other side of this interwebs, exist.

Prove to me that something does not exist!

> D) Prove to yourself that you don't exist.

If I don't exist how would I prove it to myself? I may assume everything about me is separately unique and does not identify me in any way (ie I'm just the chemical reactions that occur). Not saying dualism for example might be wrong; it may very well be the case that Jesus actually exists as a God or that some other regilion is right. It may be the case that anything we might ever concieve has nothing to do with the problem set. Or something else, or nothing at all.