Florian Müller (the English spelling of Müller is Mueller) has a problem. He has no provenance. To quote Wikipedia:
Provenance, from the French provenir, “to come from”, means the origin, or the source of something, or the history of the ownership or location of an object.[1] The term was originally mostly used for works of art, but is now used in similar senses in a wide range of fields, including science and computing.
The problem is, no one really knows who or what Florian Müller is.