Estimating/verifying the transparency degree of a KG: someone wanting to use a KG, should be able to obtain information qualifying and quantifying the transparency degree of the KG. This is particularly true when referencing some facts of the KG. It is even more important when building an index of KGs. A first step is to query the metadata associated with KGs. We want to go further, enabling verification of the claimed transparency and promoting automatic verification whenever possible by combining adapted queries and repetition of workflows execution.