I built and open sourced something similar between 2024 and 2025.

https://github.com/humthentic/itypedmypaper-v1

As others have pointed out, it's relatively a lot of effort to create an artifact that realistically current systems can pretty well forge.

I don't know that there is a scalable and comfortable solution to this problem (or at least one that is scalable and comfortable proportional to the demand for it).