Contributor attribution

Honest user stories

As a document's creator, I want to see who made which changes so that accurately assign credit or blame.

background:

• There are author colors in the Code app providing the same feature

• #41 – FEATURE REQUEST: Color by author
• #969 – Allow to see authors of changes in history

• The contributor attribution is cryptographically bound, i.e., you cannot pretend to act as someone else