https://www.theregister.co.uk/2017/08/20/bitcoins_anonymity_easy_to_penetrate/

Bitcoin transactions might be anonymous, but on the Internet, its users aren't – and according to research out of Princeton University, linking the two together is trivial on the modern, much-tracked Internet.

In fact, linking a user's cookies to their Bitcoin transactions is so straightforward, it's almost surprising it took this long for a paper like this to be published.