Cryptocurrency miners have debated over a recent report by JPMorgan Chase & Co., in which it estimates bitcoin "fair value" at US$2,400, with some arguing that the basis on which the US investment bank cites the lowest production cost miners’ in China as break-even as misplaced.Based on the digital currency’s prevailing price at US$3,900, that would point to a further 38 per cent downside before the market reaches what JPMorgan calls "fair value", defined by the estimated marginal cost of...