There are a lot of investments which have managed to beat inflation, but Bitcoin may not be necessarily one of them. The reason I say that is we do not have enough data. You cannot conclude that basis Bitcoin's price increase in 2017.
Equities, when you look at it over a period of time (decades) definitely has given returns higher than inflation.
Definitely there are also other investments which help to beat inflation.But not like bitcoin which on one hand beats inflation and on the other hand also gives very huge returns which other assets fail to give.