Ascertaining producer credits

Usually, credits that appear on screen in a finished film can also be listed on IMDb.

But there is no guarantee. Here is part of an old reply from IMDb about this: 

Generally speaking, our policy on crowdfunding and related perks is that we review these on a case-by-case basis, but we are reluctant to list producers, thank-you mentions or other types of credits for crowd-funded films where a large number of names are added without any restrictions and without any actual involvement in the production of the title, after being sold on a pay-per-placement basis or as a reward for a donation. 

In some cases, and at the sole discretion of our editors, these credits may be listed under a collective group name instead (i.e. giving credit for "The producers of XYZ Film" or equivalent generic attribution, without listing individual names, even if those names appear on-screen in the actual film). 

Filmmakers and prospective contributors should be wary of promises to deliver something that is outside of their control (e.g. placement of information of IMDb.com) because there is no guarantee that these perks can be delivered. Likewise, IMDb.com is not responsible for any claims a third party may have made about including credits or other content on our site.

https://community-imdb.sprinklr.com/conversations/data-issues-policy-discussions/crowdfunding-perks-including-fake-retrospective-imdb-producer-credits/5f4a797e8815453dba7f1772?commentId=5f4a7a868815453dbaae4568