Lumen is a private, anonymous and encrypted open source paste bin written in go.
See the original announcement by /u/wildmannli who developed Lumen:
/post/d6954111d40437c771d2
There are links to the git repos and screenshots to see Lumen in action. Now you can try it out yourself:
http://radianceoik2l7flerpnqfgf75s7gaaxyb7bn2uzpdgevoe6z5l3joyd.onion/
This looks great. I predict this tool will be very popular on tforum for sharing code snippets and things of that nature.