For well over a year now one blockchain application I use consistently beyond Bitcoin are the various notary services. It is extremely convenient and very useful to notarize presentations, contracts, proposals and other documents on the blockchain. Years from now it will be routine to accept digital hashes like this as legal proof as they are already accepted by some law firms. Even if government does not require notarized documents, it is good to know that I have them. Securely, irrevocably and publicly verifiable. Now I am using stanp.io mostly as they notarize on both Bitcoin and Ethereum blockchains. (Ethereum Classic mind you but both forms seems to move on).