[omarhaneef]

App idea: iOS/Android/PC/MacOs/ipad/linux clients to encrypt/decrypt documents on Google Docs.

Just encryption -- you don't need the whole blockchain.

Not sure there is a way to do that with Google Docs, though. You need a layer between them. You can use Google Drive of course, but then the client has to come up with all the clever features Docs provides.

[SkyMarshal]

That would be interesting, especially if generalized to support lots of different storage options - Google Docs/Drive, Dropbox, Github gists, pastebin, etc.