Job Recruitment Website - Social security inquiry - Why does the social security card of the embassy have 12 digits under the bar code?

Why does the social security card of the embassy have 12 digits under the bar code?

Social insurance registration certificate number. The number 12 below the social security card barcode is the social security registration certificate number, which refers to the media number of this card. The social security card is the full name of the Social Security Card of the People's Republic of China, which is uniformly planned by Ministry of Human Resources and Social Security and distributed to the society by local human resources and social security departments.