Miami (AFP) – Thousands of people have descended on Miami for a massive two-day bitcoin conference that opened Friday — a sign that the US city, in the midst of a tech boom, is hoping to become the next cryptocurrency hub. “I don’t think there’s anything more important in my lifetime to work on” than bitcoin, given the flexibility it offers, billionaire entrepreneur Jack Dorsey, the co-founder of Twitter and payments firm Square, told a crowded auditorium. “We don’t need the financial institutions that we have today. We have one that is thriving, that is sound, that is owned by the community,…

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