Mati_Roy answers What are reliable ways to make a statement in such a way that I will be able to prove in the future that I had made that statement?

[Mati_Roy]

I guess the best way is just to post on a bunch of platforms and have those web pages back-up by various archiving services (notably the Wayback Machine).

Publishing a book is probably too much work for most used cases.

I’ve also heard one could publish text on the Bitcoin blockchain for example, but I’m not sure how well that works.

[Said Achmiz]

I guess the best way is just to post on a bunch of platforms and have those web pages back-up by various archiving services (notably the Wayback Machine).

Note that you can also set up your writing to be automatically archived via archive.is (example).