With the changeover to the usage-based distribution system, the review criteria for the reported participations were changed. Since we have been looking at your participations on a track-by-track basis since 2010, our review criteria are now much more detailed than they were before the system change. Furthermore, evidence submitted prior to 2010 was generally returned to the artists, so we no longer have it as a basis for verification. In order to verify your participation reports, today we first research all sources available to us to ensure confirmation of your participation. Only in exceptional cases, when our research has been unsuccessful, do we contact you with a request for proof.