In 2017 the Bitcoin price exploded. If in the January 2016, the Bitcoin had a value of 400 usd, in December 2017 the price skyrocketed reaching a level of 20,000 usd. In 2018 Bitcoin price continued to decrease reaching its lowest level at the end of the year.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.

Before publishing is required that advertisers must give a plausible proof of their activity: tagged and timestamped photographs of their products, tagged and timestamped screen photos, customer's feedback with photographs, etc.