Bitcoin’s mining industry is still at a tough spot, and profitability is taking another hit. The network’s mining difficulty—a measure of how hard it is to find and add new blocks—has reached new all-time highs, even as the hashrate briefly touched 1 zettahash before retreating. Miners are facing a tough situation. Mining costs are up and fees are sitting at record lows, while competition is at an all-time high. That raises real concerns about how profitable mining still is—and what lies ahead for bitcoin mining as a whole. Bitcoin mining difficulty vs average fee chart — Bitinfocharts In simple terms, …