Zcash (CRYPTO: ZEC) gained 22% over the last week after Grayscale offered a Zcash investment product for roughly nine years, citing privacy as a key part of its investment thesis. The asset manager also gave the green light to add Bitcoin (CRYPTO: BTC) to investor portfolios Glassnode data reinforced that thesis, showing how privacy coins such as Zcash have emerged as one of crypto's standout trades.