The cost of bitcoin for the first time in its nine-year existence exceeded $9600 and came close to the next psychologically important level of $10,000. On the American stock exchange Bitfinex, a bitcoin 14:42 GMT traded at position $9575,00, stepping back from previously achieved a historic high of $9760,70. In early 2017 bitcoin was worth approximately $1000. After in October, its price has exceeded $5000, this year it's increased by almost 900%. Investors pushed concerns about a bubble in the market of cryptocurrencies.