The Treasury has refused to say how much taxpayers' cash they are spending on the project.
Ethereum could become even larger than Bitcoin, here's why.
Labour would regulate the cryptocurrency, says Shadow Home Secretary.
'We are spending tens or maybe hundreds of megawatts on producing something that has no tangible existence'
500 people have already got involved in the project.
Baffled by Bitcoin? Don't panic, here's our handy explainer.
Facebook has banned adverts for Bitcoin.
Bitcoin's woes continue.