On this ______ day of ______, 20____, I certify that the (preceding) (following). Download a template here.The purpose of the Massachusetts All-Purpose Acknowledgment form is to provide a legal framework for acknowledging signatures on various documents. Sign the letter in the space provided, using blue or blank ink. Include any credentials, such as "CPA" or "JD," if appropriate. Fill out, sign, and affix your official seal to the Notary certificate. The wording requirements for acknowledgment certificates vary from state to state. Download a proof of residency letter template for family members, notarized or non-notarized, tailored for legal use.