Reference ID is a custom identifier that can be associated with a VOD asset along with the existing Public key. It is unique to each account. When you upload a video on Viostream console, the Reference ID will be same as the Public key by default.
You can add/change a Reference ID in the Media details Page:
Reference ID will be displayed on the Media List page, just below the public key:
Note: It will be displayed in the Media List page only if it is different to the Public Key
You can search the Media List using Reference ID: