These coins are considered “cryptocurrencies,” which are a type of digital currency. This is a relatively new kind of money that began with the creation of the first cryptocurrency called Bitcoin in 2009.  Arguably one of the most important aspects of cryptocurrency is the invention of the blockchain. This blockchain is a running list of blocks in which every transaction that has ever happened is publicly displayed. This blockchain is an open ledger meaning anyone can view it, seeing who owns what and where coins are going.