Metamask We could say that Metamask are two things in one: On the one hand, it acts as a "gateway" between our usual browser and the Ethereum blockchain, without the need to install any type of software or download the complete one of its blockchain -more than 400GB-. All this is possible thanks to a simple extension added to our browser -Metamask-, which allows us to interact with Dapps and smart contracts in an easier and more intuitive way than we would do through Mist, the Ethereum browser. See full review