This issue is part of the EPIC: Signature process of an initiative #4644

• Save personal data configured in admin panel for initiative types in a field with an extra security layer and a timestamp of signature provided by a third for each signature.
• log signature creation excluding personal information and user who did it.

Is there more information about timestamp provided by a third to get ideas on how to implement it?

Currently the signature of initiatives is implemented with Decidim::InitiativesVote instances, and it requires the presence of an author, so the votes aren't anonymous. In order to have anonymous votes the author presence validation should be removed and encrypted signature data should be stored in the vote.

cc/ @decidim/product