Are there really only 21 million bitcoins? There are only 21 million bitcoins, of which 2 million can still be mined. This seems to have become common knowledge among every bitcoin investor. Is this so-called fact true? In fact, many people may not be clear about the true blockchain technology. To put it simply, everyone knows that turning stone into gold is a joke, but with the development of high technology, in the future world, synthesizing gold from other elements through nuclear fusion is not a fantasy. Moreover, blockchain technology is even less mature; the so-called limited quantity really needs time to verify. Whether future high technology can unlock the lost bitcoins from the past or even expand the 21 million cap presents enormous unknown possibilities!