Bitcoin miners are struggling to eke out a profit lately amid the asset’s falling price and external complications, including a winter storm that rocked a large chunk of the United States last weekend, impacting the production of top mining firms. A ratio that tracks the relationship between Bitcoin’s price and the profitability of running Bitcoin mining operations has hit a 14-month low, according to data from CryptoQuant.  “The miner profit/loss sustainability index is at 21, the lowest since November 20 ...