By Darren Parkin BlackRock is accumulating Bitcoin, and there’s a possibility that a spot Bitcoin ETF could get the green light by the end of the year. Those who know about Bitcoin’s scarcity and the looming supply crunch can likely predict what’s coming next. Imagine having a time machine to consider investment opportunities across various eras. Visualise, for instance, being able to invest in the stock market in the 1940s, a decade characterised by post-war economic expansion and emerging industries. Or you might consider the appeal of investing in gold during the 1950s, a precious metal his…