Just under $2 billion has been wiped off the value of bitcoin in under three days as a fight over the future of the technology underpinning the cryptocurrency wages on. Bitcoin was trading at around $1,142.60 at time of publication, giving it a market cap of $18.53 billion, according to CoinDesk data. This is down from highs of $1,255.32 on Tuesday, which valued the total bitcoin pile at $20.36 billion. Meanwhile, rival cryptocurrency ether is up over 84 percent from highs of $29.87 on Tuesday to trading at all-time highs of around $55 on Friday, according to Coinmarketcap.com. The market...