Care to elaborate a bit more on your "differential privacy"?
Is the data your looking to store publicly view-able or is it just encrypted text data on the blockchain? And do you really need to use a blockchain for it vs doing a centralized approach?
Differential privacy is when you have two datasets, (lets say A,B) and you want to add noise in between a such way that all personal identification despair from A, without compromise the data analysis on B.
If you have time, I would suggest watch Cynthia Dwork lectures on YouTube
Differential Privacy - Lecture 1
https://www.youtube.com/watch?v=OfWj89oRD7g&list=PLSYJiOsKKDKw09i1lsgKT9Zxs01YtZ3Nq&index=1As a product development I think it could be interesting for those interested about Privacy compliance (HIPAA, GDPR, ISO/IEC 29100, etc)
edited; typo