Why would foreign bodies interfere? Because it is easy money. Unless you limit the number of, and therefore access to, ID verification proofs it will inevitably be sold on the open market to any and all people. And when the problem comes up, will the state admit failure and cancel the program? Unlikely. They will more likely spend far more effort on personally identifying each person online "for the children" which just puts us back at the same problem again, except minus the cost of this whole ID verification scheme that shouldn't exist to start with.