The Guardian’s UK technology editor, Alex Hern, talks to Rachel Humphreys about the cryptocurrency bitcoin, which allows people to bypass banks and traditional payment methods. It uses a blockchain – a shared public record of transactions – to create and track a new type of digital token, one that can only be made and shared according to the agreed-upon rules of the network. At its heart bitcoin is a big database of who owns what, and what transactions were made between those owners….
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