It is a predictable thing. Cryptocurrency has become a bit popular and recognizable, so it is naturally that defines of such things appear more and more. Mentioning about Satoshi, Bitcoin, cryptocurrency and so on I met in different dictionaries, not only in the Oxford Dictionary. And it is great, I think. It means that people are searching the information about this direction and such kind of definitions are demanded.
For example from some of online dictionaries, when you try to find some information about satoshi, this one appeares - "It was founded in 2008 by this anonymous programmer using a pseudonym Satoshi Nakamoto".
May be not always the information or interpreting of information is precise, but some time ago it was hard to find even this in the Internet. To my mind very soon even more definitions will appear.