The World Academy of Research in Science and Engineering (WARSE)
In this paper, the authors probably hear about "The cloud" frequently and think of a single, huge computer that holds trillions of files. Actually, the cloud refers to some company's network of data center servers that's accessible to consumers and organizations via the Internet. Amazon has its own cloud; so do Apple, Google and a lot of other companies. "The cloud" is a generic term to describe whichever company's network of servers to which they connect. With this mechanism, the identity of the signer on each block in shared data is kept secret or private from public verifiers.