It's been another year of ups and downs for cryptocurrencies. In the second episode of our week-long series, we ask whether it's time to control how - and by who - they are used. Show more
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It's been another year of ups and downs for cryptocurrencies. In the second episode of our week-long series, we ask whether it's time to control how - and by who - they are used. Show more
The BBC's international radio station
