Cryptocurrencies: surge in value prompts fears of ‘dotcom-style' bubble

Are the likes of Bitcoin coming to an end or moving into the mainstream?

A pile of Bitcoins
(Image credit: George Frey/Getty Images)

An explosion in the value of so-called cryptocurrencies over the past year has prompted fears of a market bubble and crash that could have serious implications for the global economy

How have they performed this year?

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