The parties involved in the writing and signing process of an affidavit are: The affiant: the person providing the written statement and filing it The court or legal entity receiving the affidavit A notary public or official authorized to commission an oath: this is the individual that authorizes the affiant’s signature, signs the document, and seals it to make it valid. Witnesses: In most states, at least two witnesses are required to be present at the time of signing the affidavit.