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Is it time to start taking cryptocurrencies seriously? Or do Bitcoin speculators put the whole project at risk? Ed Butler speaks to Andrea O'Sullivan, cryptocurrency expert at the Mercatus Center at George Mason University in the US and Jim Harper, vice president of the Competitive Enterprise Institute and former adviser to the Bitcoin Foundation. We also hear from one beneficiary of a secret Bitcoin multimillionaire giving away their fortune. Connie Gallippi is founder and executive director of a charity called BitGive.

(Photo: Bitcoin graphic, Credit: Getty Images)