The cryptocurrency market has grown dramatically in the past year, with the total value of all outstanding offerings approaching $1 trillion as of early 2018. Bitcoin (BTC-USD) was the pioneer in the space, but up-and-coming rivals have also made a big splash and are aiming at even greater highs. Thanks to huge gains in 2017, Ripple (XRP-USD) has become one of the biggest cryptocurrencies other than bitcoin.As the prices of cryptocurrencies have gone up, investors have generally taken one of two paths toward exploiting favorable trends.