Casper is a protected and reliable utility for DApp based on Ethereum platform. It is the fastest way to ensure your DApp stores data, i.e., video, photo, audio, text, databases. It is implemented by joint effort of a variety of vendors, which provide their hard drives and internet-channels for storing and transferring your files. They will rent their facilities in exchange for monthly reward, such as tokens. Vendors may choose to become local data centers, which will ensure a higher access rate and low response time for all users, both individual and companies.