Bitcoin smashed through the $5,000 barrier for the first time ever on Thursday, jumping as much as 7 per cent to chalk up its biggest daily rise in over two weeks.Bitcoin, the original and still the biggest cryptocurrency, has been on a tear recently, rallying nearly 75 per cent in barely a month.It has chalked up a more than fivefold increase in price since the start of the year.Earlier this week, Russia announced that it will block access to websites of exchanges that offer crypto-currencies such as Bitcoin, calling them “dubious”.