Peter Schiff, a well-known Bitcoin (CRYPTO: BTC) critic, has once again expressed skepticism about the latest Bitcoin rally that saw the apex cryptocurrency surpass $56,000—a level not seen in two years. What Happened: Schiff took to X on Tuesday and said, “There is an old saying that markets take the stairs up and the elevator down. With #Bitcoin it’s a bit different. Bitcoin takes the elevator up and then jumps.” His comments come at a time when the total market capitalization of cryptocurrencies has once more crossed the $2 trillion threshold, buoyed by positive sentiment and steady investm…