A system and method for performing Electronic Check Presentment (ECP) processing. The system and method employ digital imaging techniques to digitally image the physical checks as they arrive subsequent to posting of the ECP items. The images are electronically linked to the data records that represent the checks. During the proofing process, in which the data records for the ECP items are validated against the data records for the physical items, the records are updated such that the posting date and ISN number for the data records for the physical items reflect the posting date and ISN number of the ECP items. As the digital image of the check is electronically linked to the data records, the image is thus carries the posting date and ISN of the ECP item.