Twitter and Square CEO Jack Dorsey says he believes bitcoin will eventually become the world's single currency, but it will probably take over ten years (Lucinda Shen/Fortune)

Lucinda Shen / Fortune:
Twitter and Square CEO Jack Dorsey says he believes bitcoin will eventually become the world's single currency, but it will probably take over ten years  —  Twitter CEO Jack Dorsey isn't pulling his punches on Bitcoin.  —  While J.P. Morgan CEO Jamie Dimon sees promise in blockchain …

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