Tyler Cowen points me to this from the Economist:
Most trading in bitcoin takes place in China: Huobi and OKCoin, two Chinese exchanges, are thought to account for more than 90% of transactions. The currency seems to have become an outlet for Chinese savers frustrated with their limited investment options and searching for high-yielding assets. The Chinese authorities are worried enough to have banned banks from dealing in bitcoin, but individuals are still free to speculate and have been doing so with gusto.
….China has also become the global hub for bitcoin mining, the process by which heavy-duty computing power is used to process transactions involving bitcoin, earning those doing the processing some new bitcoin as compensation. Over 80% of new bitcoin are now minted in data centres in places like Sichuan and Inner Mongolia.
One of the selling points of e-currencies like Bitcoin is that their decentralized nature makes them inherently free of government meddling. But is that really true? I’ve long thought that techno-evangelists show far less respect than they should toward meatspace assets like nuclear bombs, gun-wielding police forces, ownership of fiber optic networks, vast fortunes in physical goods, and so forth. This is, for example, why so