What is the Blockchain – part 3 – Blockchain Startups and Five Challenges to Overcome In this series of posts, I am providing insights in a technology that will change our world. Blockchain has been said to be as important invention as the Internet and Johann Palychata, aThis content is restricted to site members. If you are an existing user, please log in. New users may register below.Existing Users Log InUsernamePassword Remember Me Forgot password? Click here to resetNew User RegistrationChoose a Username*First Name*Last Name*Email*Confirm EmailPasswordConfirm Password* Please indicate that you agree to the Terms of Service *Required field Posted in Blockchain and tagged part 3, What is the. Blockchain.