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While this is true, the amount of physical currency is small compared to the total amount of money in existence…

…and the ubiquitous use of cards for transactions appears to be moving toward a cashless system using the currencies we have

Cryptocurrencies offer a number of interesting and useful properties, and I suppose a large enough system would preclude the possibility of a 51 percent attack, (I don’t really know exactly what this means mind you) but without assurance that some government could not mount such an attack, I’m going to remain cautious

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