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In a series about things that made the modern economy, blockchain may not yet deserve the past tense. But venture capitalists are pouring billions into startups and enthusiasts say blockchain could become as disruptive as the internet. How can we decide if they’re right? First we need to get our heads around the most famous blockchain – Bitcoin – and see why the underlying technology might have much wider applications. But, as Tim Harford explains, we need to think about all the challenges that first need to be overcome. Producer: Ben Crighton Editor: Richard Vadon