E-currency defies banks and borders

The Argentine software developer was dealing in bitcoins — getting an injection of the cybercurrency in exchange for a wad of real greenbacks he handed to a pair of Australian tourists in a Buenos Aires Starbucks.

In the safety of the coffee shop, the tourists transferred Fink their bitcoins through an app on their smartphone and walked away with the cash.

It’s transactions like these — up to 70,000 of them each day and growing fast — that have propelled bitcoins from the world of internet oddities to the cusp of mainstream use

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