OneDiary - Synchronizing diaries across devices online and offline

I want do make a journal app that is easy to write diaries, easy to review diaries, never to worry about losing data, and it is privacy and security. It is base on Web 1 + Web 2 + Web 3. Web 1: All data save locally. you can write diaries without network, synchronize data device to device in local network, without any other server. Face to face exchange diary. Web 2: You can backup your data to cloud disk, like Google Drive, OneDrive. You can publish your diary online. You can exchange your diary online. Web 3: You can publish your diary to the blockchain, so it will never be modify or delete. it is power with AI. AI-generated summaries, comments and translation on diary entries. Perhaps one day, you could use AI to create a virtual version of yourself using your diary data, locally.