These databases already exist. For example, all driver's licenses issued in a state are part of the public record, and many companies already maintain databases

These databases already exist. For example, all driver's licenses issued in a state are part of the public record, and many companies already maintain databases of them. For example, you can sign up for an account with the NY DMV that allows you to search all DMV records, as long as your use falls within one of a dozen permissible use-cases (including "To verify the accuracy of information submitted by the individual to the business"). Identity documents are designed to be verifiable, which in this case generally precludes them from being secret