In the following sections we describe the most important properties that a decentralized blockchain satisfies. To get started on the properties think about the following question.
{%mcq ans="o3"%} {%title%} In a decentralized payment system, what would you deem the most important characteristic? {%o1%} The price of the digital currency should be constant, e.g., bound to a fiat currency such as the US dollar. {%o2%} The payment from one entity to another entity should be very fast. {%o3%} An entity should not be able to perform double-spending, i.e., spending an amount more than once. {%endmcq%}
Let's start with the first property.