Cryptocurrencies and tradable crypto-tokens can be understood only against the background of their generating use cases. Even though they can be traded in exchanges, their primary markets are the blockchain-based ecosystems where these use cases are operationalized. The tokens’ features, their design attributes, are dictated by the needs of said ecosystems. Hence, it is imperative to first situate them firmly in their proper context before analyzing their uses as stores of value and investable instruments across the digital-to-physical worlds divide. This chapter will lay out the foundation of notions and terminology that are necessary to be able to understand the ideas and methodological explanations of the rest of the book.