Once you get the defendant or respondent's signature for delivery, fill out a Proof of Service and file it along with the signature. Download Utah Affidavit of Service template, modify and send for signing using BoloForms Signature.I certify that I filed with the court and am serving a copy of this Proof of Completed Service on the following people. Utah Affidavit Templates. Use our Affidavit template to swear to the truthfulness of a statement or fact. General affidavit form for use within the State of Utah. Modify this affidavit to meet your specific needs. Some of the following forms are available in PDF and Word. Some of the PDF forms can be easily filled out and printed. •You must complete a form before you file it.