Some experts say that bitcoin is a liquid commodity. It should be noted that the same characteristic is given to money - liquidity means the asset's ability to easily move from one form to another (money "changes" in goods and vice versa). Hence, the process of "buying" for bitcoins means the exchange of one commodity, less liquid, to another, more liquid. Proceeding from this assumption, it can be concluded that "trade" for bitcoins will be a kind of barter contract. However, this approach to the definition of both bitcoin and money is more economic than legal. It turns out that goods and services change to bitcoquos, which are externally presented in the form of a documented record consisting of numbers and letters of the Latin alphabet.