(iv) backup practices; and (v) audit procedures to assure the continuing integrity of the records; (e) that the person keeps the computer in a good state of repair; and (f) that the computer was in working order at the time the witness obtained the readout. 4. Self-authenticating data messages. For the purposes of regulation (3) (a) a data message is selfauthenticating if— (a) the message has a sign, inscription, logo, tag or other unique feature identifying it with a particular business, institution or person and the origin of the message is not in dispute; (b) the message can be attributed to the originator under section 19 of the Act. 5. Use of harsh marks or metadata (1) A data message may be authenticated by use of its harsh marks or metadata. (2) For the purpose of this regulation— (a) “harsh mark” refers to a unique identifier attached to a data message; (b) “metadata” means information describing the history, tracking, or management of a data message and includes information showing the date or person creating or accessing the data message or transmittal information. 857