What Satoshi Did Not Know (2015) [pdf]
With the benefit of hindsight, the biggest thing Satoshi didn't know (or didn't foresee) was that the idea of "one CPU, one vote" was flawed, a victim of its own success, because of mining ASICS.A consequence of that is that bitcoin and related cryptocurrencies really aren't as decentralized as claimed.It's fascinating how things just seem to have a way of becoming centralized once enough money is involved, even when engineers thought hard about how to avoid that (see also: the internet).