Bitcoin has spiked against the dollar, broaching the $240 mark for the first time this month.

Read more: How to really make money from Bitcoin

The cryptocurrency reversed sharp falls from earlier this month to jump as high as $241.09 today, as investors awaited a policy update from the US Federal Reserve which is expected to hint an interest rate hike will be held off until September, and negotiations between Greece and its lenders became more terse.

Bitcoin isn't the only thing benefiting from falling investor confidence. The price of gold jumped as high as $1,187.74 this morning, suggesting investor nervousness around traditional currencies.

Windsor Holden, head of forecasting and consultancy at Juniper Research, pointed out that Bitcoin tends to react strongly to changes in investor sentiment.

"It has experienced a large number of spikes over the past 18 months," he said. "We've seen a lot of sharp corrections, normally when exchanges have collapsed.

"It tends to be impacted more than other currencies – so the fact we've seen this sudden increase is more to do with the nature of the currency itself."