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.
Its good that we have some good knowledge about this all but really after reading this thread I am very dissapointed with this all how technology is in halal or haram really shocking for me because this is never been haram and as you already posted few things are really bad like interest, alchohol but its never been question about technology few peoples still living in dark age and have issues with this all.