title: Hyperledger new user register
body: <p>Hyperledger has membership service, which keeps some initial members in the membersrvs.yaml file, e.g lukas, jim etc.</p>
  
  <p>Then the user has to log into the network, by posting to restapi /registrar the enrollmentid and secret. </p>
  
  <p>My question is how to create new user for the network for the users that are not defined in the CA? It seems admin user can do that, but how to invoke the /registrar api with the admin security context?</p>
  
  <p>Thanks </p>