Following the moves of billionaires across Wall Street can provide some valuable insight into the ideas of some of the smartest investors around. While any single trade rarely means too much, taken in aggregate, interesting trends can emerge.One fund in particular has seen an incredible inflow of capital from these investors during the last year: the iShares Bitcoin Trust ETF (IBIT 6.36%). The exchange-traded fund (ETF) is the largest of the new spot Bitcoin ETFs that launched in January after receiving the ...