How to find and check providers of fake Digital Object Identifier (DOI) numbers? What are the consequences of using fake DOI numbers? How can I know is DOI number actually fake?
DOIs are registered and managed by Registration Agencies appointed by the International DOI Foundation. All registered DOI numbers resolve through https://doi.org/ - if it doesn't resolve it's not a DOI. A DOI can be applied to many different things so the fact that content has a DOI doesn't say anything about the quality or validity of the content. There's a blog post about this - https://www.crossref.org/blog/dois-unambiguously-and-persistently-identify-published-trustworthy-citable-online-scholarly-literature-right/
Attempt to resolve the DOI digitally. If the number doesn’t resolve then it doesn’t currently identify a digital object adequately.
Do you mean “how do I identify DOIs resolving to objects that are academic garbage, lack peer review or a publisher exhibiting academic standards of review prior to publication?”
The EU-backed FREYA is currently working on a project called 'common DOI search' to address this issue.