You could use [trusted timestamping](https://en.wikipedia.org/wiki/Trusted_timestamping https://en.wikipedia.org/wiki/Trusted_timestamping) to prove that you're

You could use [trusted timestamping](https://en.wikipedia.org/wiki/Trusted_timestamping https://en.wikipedia.org/wiki/Trusted_timestamping) to prove that you're the one who first created that proof.