Mass. Gen. Laws ch. 185, § 68: Registration of mortgage

Section 68. Registration of a mortgage shall be made in the following manner: the assistant recorder shall enter upon the certificate of title a memorandum of the purport of the mortgage deed, the time of filing and the file number of the deed, and shall sign the memorandum. He shall also note upon the mortgage deed the time of filing and a reference to the volume and page of the registration book in which it is registered.