Investors piled back into Bitcoin ETFs and their Ethereum counterparts Tuesday, reversing days of outflows, although the fresh investments failed to give the two largest cryptocurrencies by market value a long-lasting bump.  The price of the two biggest digital assets has in the past risen significantly when investors have bought shares of the American ETFs.  Investors sank about $477 million and$142 million into  the Bitcoin and Ethereum funds, respectively, on Tuesday, according to U.K. asset manager Far ...