How frustrating to see that many contributions are declined because they can't be verified, along with the question to prove it. For years I only contribute data right from the movie credits but there is no way to prove their correctness. So, if one cannot contribute data that IMDb cannot verify, what's the purpose of it? If one can only contribute data IMDb can verify, they can just as well add the missing data themselves. Conclusion: there's no way to enrich de database with details IMDb don't know or can't find. So IMDb, in stead of wasting my time with this, without getting trust over the years, I would say, sort it out yourselfs.