Easy--Triaconta/combicoin...I say this because it is the safest way to make a profit AND preserve capital...essentially a way to participate in the upside of an index of the top 30 'alt coins' while profiting from an arbitrage play at the same time...always 'real' asset backed (USD) and with the 'tria' feature that does (lots of things) but most importantly returns to you 50% of all profits made by the company...they have a long history of doing this kind of thing in the energy market and it doesn't get much more cutthroat than that...ICO through September