在Angular应用中跟踪匿名用户

I am working on SPA AngularJS application which allows users to collaborate on projects and stores history of edits for each user. The requirement is to allow unauthenticated users to manipulate data too. Once the user registers, I need to associate her history of edits with the newly created account. The backend is Django. What is the best option to track actions of anonymous users?I am working on SPA AngularJS application which