The IEEE Computer Society Blockchain Special Technical Community is a new worldwide Open Community on Blockchain within IEEE. Blockchain based technologies have recently emerged into the mainstream, demonstrating the advantages of decentralization, disintermediation, anonymity and censorship resistance, especially in relation with the financial sector. Blockchain technologies, through recent development, have not only enabled simple transactions, but also complex computation on a network. These advances are now not just limited to the financial sector, but also new internet applications can harness these building blocks to empower users to take control of their online footprint, such as in healthcare, social media and other digital services. The community shall become the gathering place for academic researchers, practitioners and business innovators alike, where they may meet and work together to embrace, promote and enhance blockchain technologies and their applications.