Block chain concept – Chain consists of network connections . 3d rendering2019-05-032019-05-03https://www.traveldoo.com/wp-content/uploads/2018/03/alan-expedia-company-blue-on-white-4.svgTraveldoohttps://www.traveldoo.com/wp-content/uploads/2018/03/alan-expedia-company-blue-on-white-4.svg200px200px