[EricRiese]

I just listed several as far as I'm concerned. I don't see it happening as a Y Combinator Silicon Valley ad supported startup. The best I can imagine right now is to pitch the vision and have standards bodies and industry groups collaborate on the standard and then maybe find some place where the government can dictate "if you do business with us, you have to use this tech". For instance using the receipts for tax deductions. Give a preferential rate for digitally signed receipts to pass back the cost savings of not dealing with paper. And then hopefully it grows from there.