If you need to make a legal document that functions as an affidavit, authentication, witness, or acknowledgment, you should check out which notarial services are available in your area or online that can help you in verifying your documents. You can visit the office of a notary officer and meet him in person or you can book an appointment with them for a meeting. Notaries offer their services online also so if anyone wants to get documents signed by a notary, they can visit the website of a notary and request a service.