When transferring a blockchain certificate along with its artwork from its previous owner to its new owner, the previous owner needs the new owner's email address to transfer the blockchain certificate.
If the new owner has not registered on Startbahn Cert. when transferring the blockchain certificate, the previous owner needs to get an agreement with the new owner to provide his/her email address to Startbahn.
In case the new owner does not agree, the previous owner must select "Encrypt Email Address" so that he/she can transfer the certificate without providing the new owner’s personal information (email address) to Startbahn. In that case, Startbahn only stores hashed data of the new owner's email address on its server. (However, no email will be sent from Startbahn to the new owner to remind him/her of the account registration.)
*Hashing is a form of cryptographic security that can convert an email address into random characters, which cannot be recovered to the original email address (non-reversibility).