A system includes a first client device that is coupled to a second client device. An apparatus, coupled to the first and second devices, includes a storage device coupled to a processor. The storage device stores software instructions for controlling the processor that when executed configures the processor to generate a listing of expected values and referral events associated with a tracked matter. Each referral event corresponds to a different expected value and the distributed listing includes a sequence of units corresponding to different expected values and corresponding referral events. The processor receives a notification from one of the first or second device that is representative of a referral operation between the first and second location. The processor determines an outcome value for the referral operation and identifies whether the determined outcome value is accurate based on the distributed listing.