Good engineering begins with a clear problem and attempts to find the optimal solution for it. An optimal solution not only solves the problem, but by definition does not contain within it any irrelevant or superfluous excess. Bitcoin's creator was motivated by creating a “peer-to-peer electronic cash,” and he built a design for that end. There is no reason, except for ignorance of its mechanics, to expect that it would be suited for other functions. After nine years and millions of users, it is safe to say his design has succeeded in producing digital cash, and, unsurprisingly, nothing else.
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