The proof of address certifies that the person lives in the place mentioned. A utility bill (water, electricity, gas, internet) can be used to confirm this. The name of the owner of the contract, linked to the address given, must correspond to the information provided. In some cases, an affidavit may be required to show that a member of the same household is staying at the address given. It is generally assumed that the invoice supplied is less than 3 months old.