The Riemann hypothesis is one of the deepest problems in all of mathematics. It is one of the six unsolved Millennium Prize Problems. A simple search in the arXiv will yield several claims of proofs, some of them by mathematicians working at academic institutions, that remain unverified and are usually dismissed by mainstream scholars. A few of those have even cited de Branges' preprints in their references, which means that his work has not gone completely unnoticed. This shows that de Branges' apparent estrangement is not an isolated case, but he is probably the most renowned professional to have a current unverified claim.