>I bet A and C are going to be in the hundreds of millions, if not billions, while B is going to be in the tens of millions and D is going to be in the thousands of dollars.

Bitcoin is incredibly wasteful. If we're talking about digital transactions we already have credit cards and digital transfers. A block chain isn't required for those benefits.

Supply chain tracking is interesting but literally no one is talking about that. Its also an even harder problem. Its really not verifiable at all because you're now relying on data from outside the chain, ie how many widgets were created, whether the label on the real life widget is unique or forged, etc.