Is a rubber stamp as good as a wet ink signature?

I accepted a document that was signed with a rubber stamp and dated in wet ink by the Offeree. Also in wet ink is the document number/account number and at the top is "Amended" handwritten in wet ink. The form was pulled from FORMs tablet and it clearly is the original document and not a photo copy. The document was pulled away from a tablet of standard forms. The party that signed his name is now claiming that I accepted a photo copy and not a wet ink copy. We are going into litigation and I want to get my document legally verified by witnesses and notarized as the original wet ink document and to verify that I am the receiver and holder in due course of that original ("Amended") contract. Only the party who offered the contract to me signed it and not with wet ink; my signature is not on it but my d/b/a is listed on the doc. I went to ask the notary public how to effect a notarized verification that the document that I have is the original form from the tablet and not a photo-copy as is now being claimed by the "signing" party.