What is the relationship between social insurance and buying a house?

Generally speaking, social insurance has nothing to do with buying a house, but in reality, the state has introduced many related policies to link the two. For example, in cities where real estate purchases are restricted, foreign households who want to buy a house in the local area must have social insurance or tax payment certificates for many years before they can buy it. Otherwise, you are not allowed to buy a house (a house with 70 years of property rights, a house with 40 or 50 years of property rights).