“From the beginning, Satoshi envisioned a digital analog to old-fashioned gold: a new kind of universal money that could be owned by everyone and spent anywhere. Like gold, these new digital coins were worth only what someone was willing to pay for them—initially nothing. But the system was set up so that, like gold, Bitcoins would always be scarce—only 21 million of them would ever be released—and hard to counterfeit. As with gold, it required work to release new ones from their source, computational work in the case of Bitcoins.”