Too Long; Didn't Read
A simple blockchain application for data verification is simple and simple. It uses an old version of solidity and it works just fine and you can test it just fine. It is only a simple contract with one variable and two functions. The applications for this pattern are endless and lots of people did take advantage of the pattern. It will work for attesting to the authenticity of any business transaction, IoT data set or user identity, among many others. It can be used to store user generated data that can be trusted.