I need a preliminary analysis on the best approach to build a web app that takes a document from the user and save this document (original, updates and versioning) on secure blockchain repository.
The web app accepts pdf files only and save them for later retrieval (after one year or many years). Users who saved their files can retrieve them and update them also using their accounts.
I need a blockchain professional to give me a concise analysis on the best approach to build this technology and how to implement it best.
The selected freelancer can also build the app later on or will be hired to advise on the selection of a freelancer (team) to build it.