sourceHash property
This is a hash identifier we are building on the BNet side in an attempt to let people group collectibles by similar sources. I can't promise that it's going to be 100% accurate, but if the designers were consistent in assigning the same source strings to items with the same sources, it ought to be. No promises though. This hash also doesn't relate to an actual definition, just to note: we've got nothing useful other than the source string for this data.
Implementation
@JsonKey(name:'sourceHash')
int? sourceHash;