Bitcoin, and most different Cryptographic forms of money, have their esteem controlled 100% in light of interest. Sites, called "trades", that offer a stage to trade "typical" cash for Digital forms of money, enable people to influence purchase/to offer "requests" which state:

Which Cryptocurrency(eg. Bitcoin)

What number of units(coins) might the client want to purchase/sell(eg. 1 Bitcoin)

At what cost limit(eg. "purchase MAX at 14000$", or "offer least at 14000$" per coin)

Term of the order(when will the request lapse)

The value rises when the rest of the offer requests set a higher least cost than it was previously(on normal) and if the purchasers will pay it(because there are no more offer requests at a lower cost any longer - all sold out!). So if the interest for a Digital currency is sufficiently high to deplete the "shabby/normal" supply(cheap offer requests are purchased rapidly, leaving just the more costly ones) and purchasers consent to pay the higher value, at that point the normal cost of that Cryptographic money (on that trade) goes up.