What is the meaning of Chengdu social security number

The blue one is the original social security card, and it is issued only in some areas, and the ginkgo leaf one is the newest social security card issued by Chengdu City, and there is no difference between the two, because the whole Chengdu social security data is now networked, including 7 districts and 12 counties, and one's ID card number corresponds to only one social security number (after networking, some of them will be duplicated, the reason is that the original in the absence of the network time, respectively, in 2 districts have bought social security. The first time the network was bought in two districts, this selection of a continue to buy on it, and finally retired when counting the number of months of contributions is counting the total number of months of contributions)

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