Looking for proof in these matters is probably a fool's errand (though many seem to undertake it...) As for explanations, that doesn't seem to be out of the question up to some assumptions, as is usually the case with explanations. Anyone choosing to go down the rabbit-hole of solipsism is literally alone with his thoughts.
I agree. All I mean to say is that the reason it's hard to come to a consensus on what we mean by "consciousness" is that we're trying to unambiguously capture this first-person thing in third-person terms. This is bound to fail for effectively the same reason it's impossible to know (with certainty) that anyone other than myself is conscious. I can at best capture evidence for the objective properties about you that make me believe you're conscious.
