For most of the year, Bitcoin has been the center of the crypto market. Now, some of the market's forgotten coins are suddenly making noise again. Zcash (ZEC) has been leading the move. It jumped nearly 40% over the first week of September, broke above $1,200 and entered the top 10 cryptocurrencies by market capitalization. That is a big comeback for a coin that has spent years outside the market's main spotlight. But Zcash isn't moving alone. Privacy-focused assets have started attracting fresh attention, while XRP and several other altcoins are also showing signs of renewed strength. So the obvious question is: Are we finally seeing the beginning of another altcoin rotation? Why privacy coins are suddenly interesting Zcash's comeback has several possible drivers. Grayscale's spot Zcash ETF began trading on NYSE Arca on August 25, giving traditional investors a regulated way to gain exposure to ZEC. The fund had grown to more than $400 million in assets...