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Coin is a great step forwards for consolidation, and it will probably make future post-credit-card technologies more palatable. In that vein alone it's a win.

That said, there's lots of reasons to be worried about Coin from a security perspective. But, at least in the US, consumers bear few of the penalties and costs associated with fraud -- only the credit card companies and banks do. So we will likely see significant adoption from savvy consumers and some resistance (or outright revolt?) from CC companies and banks.

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