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Observers, proficient financial specialists and senior investors have issued notices over a Bitcoin bubbles. Regal Bank of Scotland executive Sir Howard Davies told Bloomberg: "Every one of the specialists can do is set up the sign from Dante's Inferno – 'relinquish trust all ye who enter here'."

The Reserve Bank of India, the nation's national bank, has issued three separate Bitcoin notices since 2013. A month ago the European Central Bank VP said Bitcoin was a "theoretical resource" where financial specialists were "going out on a limb of purchasing at such high costs".

Among venture financiers, JPMorgan Chase boss Jamie Dimon has been among the most vocal. In September he said Bitcoin was a "cheat" and anybody "sufficiently inept to get it" would in the end pay the cost.