In our system, voters' personal data is the name entered by the vote organizer when compiling the list, and the email address/phone numbers are not stored on the blockchain: we store them in the database of a special authentication service. The blockchain stores only the internal identifier assigned to the voter by this service.
Access to this database is limited and is only used to authenticate voters and send them notifications of upcoming polls. There is no other processing of voters' personal data in our system.