Hey guys, I have a question: do you think a truly secure p2p messenger should rely on the use of blockchain or some other technology to ensure the complete privacy?

Personally, I can see several quite obvious problems with blockchain-based apps, which are the size of the blockchain itself and the excessive amount of computational resources needed to run a PoW algorithm. But even with all those disadvantages, I don't think there is really a different option for a truly secure app.

What do you guys think?