Competition is a contest or rivalry between some number of entities for some resources, awards or changes in social status. Competition is an essential part of nature and is one of the main forces of biological, economic and political development. Competitions are widely used to motivate future and current participants to gain higher results, to draw attention to some event and to recruit professionals into some special activities. Competitions are also popular to use as a marketing tool. Blockchain companies often hold competitions to draw the attention of skilled developers to their products. Blockchain competitions often offer some prizes for creating an interesting project on the platform of the contest holders. They are also a great tool for programmers to practice coding and HR for employers.