An expired notary stamp is a seal used to authenticate a signature that has been notarized by a public official. It is the responsibility of the notary to ensure that only valid stamps are used, and that all other expired stamps are destroyed or removed from use. Expired notary stamps are an important feature in the verification process and should not be overlooked. By keeping track of these stamps, a business can ensure that all of its documents are properly authenticated, guaranteeing accuracy and protecting it from potential fraud.