Herding sheep. Rockets to the Moon. Bank shame. And Blockchain... is it safe? This is the second instalment of my "Foundations" series. I describe how data is stored on the blockchain and what makes it so secure. By the end of the episode you'll know exactly what the mysterious process of "mining" is! Of course there are a few issues still to sort out - it's early days for blockchain technology. But the future opportunity areas are compelling.

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