CommentOct 17, 2018You can follow this tutorial: https://www.ethereum.org/tokenHow do I create my own cryptocurrency on top of Ethereum?
CommentOct 11, 2018The backend will check for the uniqueness of the email throw a response 409 or 422 (if you are dealing with REST). That way your UI will receive those error codes and show the appropriate error."E-mail address already been taken" is responsibility of validator library or UI?