The alternative is to use CFDs. Contracts for different track markets, including popular cryptocurrency pairs like Bitcoin/US dollar (BTC/USD). With these contracts, you pay or receive the difference in market price between when you open the contract and when you close it.
The primary advantage when CFD trading cryptocurrency is that you do not have to deal with the logistics of obtaining, sending, and holding your digital money. You trade the price differences using regular funds already in your trading account. You do not actually have to hold cryptocurrency at all. The only requirement for this type of speculation is finding a reputable crypto CFD trading platform.