Sounds good at first, but now your calls stop working if the regulator's system goes down for maintenance. You can certainly make it work, but I don't see what

Sounds good at first, but now your calls stop working if the regulator's system goes down for maintenance. You can certainly make it work, but I don't see what the major benefit of using a central database is here. > It wouldn't need to handle a large number of transactions per second because people don't change phone providers very often. That makes it fit blockchain quite well, actually.