An anonymous reader writes: The virtual currency Bitcoin lost 21 per cent of its value yesterday, equating to a total loss this year of 44 per cent. Reports have suggested that this rapid fall is squeezing computer supporting systems and is raising alarm about its future viability. Bitcoin’s value fell to $179.37, 85 per cent lower than its record peak of $1,165 at the end of 2013. In total, nearly $11.3bn has been lost in Bitcoin’s value since its 2013 high. The decline has raised concern for Bitcoin ‘miners’ who support the transactions made in the digital currency, and whose profits become squeezed as its price falls against traditional currencies.