Despite much attention paid to miners, non-mining full nodes are also important for the integrity of blockchains since they store copies of the same ledger. Given the unpredictable nature of the Chinese government, the fact that cryptocurrency mining is heavily concentrated there has caused some concern.
On January 23, Bitnodes web-site published a study of Bitcoin node distribution across countries. It turns out that, in contrast to mining, Bitcoin nodes are mostly run in Western countries. The leader with around 24.5% of all nodes turned out to be the U.S., with Germany occupying the second place with just under 20%, with all other countries far behind. China did not even make it to the top ten.