The issue of stock has been resolved for a long time. The Shariah Commission publishes listings of companies to invest in.
Write a request to google "halal stock".
Yeah, stock of companies that deal with interest, alcohol, or other harams, are haram as well while investing in other stocks have no issue. Then why would Bitcoin be haram? Does bitcoin deal with interest? No. It's just another currency; people may use it for any purpose, same goes with fiat as well.