Discourse Fingerprint comes as a tool to community managers in their combat with internet trolls. It works by computing a unique identifier (a fingerprint) of each registered user, by taking into consideration over 20 browser characteristics such as user agent, screen resolution, timezone, device memory, etc.
Follow Install a Plugin guide, using git clone https://github.com/discourse/discourse-fingerprint.git as the plugin command.
The plugin creates a dashboard that can be accessed by administrators by going to Settings > Plugins and selecting Fingerprint from the left side.
Staff may check individual users by typing in their name or by looking over the latest discovered matches.
If you have issues or suggestions for the plugin, please bring them up on Discourse Meta.