This was a very informative article, thank you for writing it! I was planning on implementing something similar but did not know where to start, so this is really helpful. Also, in the line "If you open the developer tools and go to the "Application" tab, you will see a cookie named `user_uuid`.", I noticed that the cookies were not in the Applications tab but the Storage tab. This may just be a difference in browsers (I am using Firefox, perhaps you are using chrome), but I thought I would let you know.