THERE are mounting fears that Bitcoin investors will struggle to get their cash out after the cryptocurrency's value fell 40 per cent in a single month.

Many are looking to put their money in gold instead, with some European gold traders reporting a "five fold increase" in demand amid fears Bitcoin could collapse entirely.

But it could be bad news for investors tied up in Bitconnect who fear they will lose their money after the controversial trader announced it was shutting down.

It assured customers they would be able to withdraw at a "recent exchange rate" but "continuous cyber-attacks" have prevented them from doing so, Fortune reports.

Concerned investors have since taken to social media to complain they fear losing anything from a few thousand dollars to their entire "family savings".