Bitcoin rose 6.8% to $56,852.03 by 1000 GMT on Wednesday, adding $3,622.23 to its previous close. However, the world"s biggest and best-known cryptocurrency is down 12.4% from the year"s high of $64,895.22 on April 14. Ether , the coin linked to the ethereum blockchain network, rose 5.92% to $3,430 by 1000 GMT on Wednesday, adding $191.58 to its previous close.