That's exactly what we have developed at [bohr.app](https://bohr.app https://bohr.app). As far as I can tell, our solution checks all the requirements mentione

That's exactly what we have developed at [bohr.app](https://bohr.app https://bohr.app). As far as I can tell, our solution checks all the requirements mentioned in the post. We have a decentralized data storage system that supports delta syncing, sends/receives data over encrypted P2P communications between multiple devices/users without a "central" data storage, and leverages some concepts taken from blockchain technology to ensure data integrity and immutability.