Bitcoin is as real as we choose to make it.
Things we know : 1) There are exchanges were one can purchase Bitcoin with a checking account, debit card or even credit card; 2) When one purchases a Bitcoin a debit is made against one's fiat currency account, in exchange for which one is credited with a given amount of Bitcoin; 3) That Bitcoin may be sold to another individual in a transaction that credits one's fiat account with the market value of the Bitcoin at the time of sale; 4) Whether one has made a profit or a loss is reflected in one's fiat account balance after the purchase and sale are completed.
What more would a doubter in the concreteness of Bitcoin need to convince them of the realness of Bitcoin?
Are any or all of the above steps unnecessary to the argument that Bitcoin is real?