Azure Stack Hub is an extension of Azure that provides a way to run applications in an on-premises environment and deliver Azure services in the datacenter.
Microsoft Azure is the Windows Azure Platform enables businesses to run critical applications with a higher performance price ratio by running them on the services platforms data centers on a pay as clients go basis.
Ethereum is an open-source, blockchain-based public distributed computing platform and operating system they are used to codify, decentralize, secure and trade just about anything