Bitcoin experienced a significant retreat from its latest record high, amid a mix of profit-taking by investors and growing concerns over speculative froth in the cryptocurrency market. The digital currency's pullback to a one-week low on Friday was influenced by a recent uptick in U.S. inflation, which added to the volatility and led to a reassessment of its record-breaking rally. Discussions around whether the current bull run in cryptocurrencies is driven by speculative investment have intensified, with some market observers labeling the situation as a 'bubble'.