Do you need to do this for one document or thousands of them?
Assuming your objective is to establish that a document existed in that exact form no later than a specific date, it can be done electronically by scanning the document and emailing it to a mail service where end users have no ability to tamper with the database or headers (i.e. most webmail services).
For the actual paper hard copy, I can’t think of any solution - simply because anything that, for example, degrades or changes over time*, is only going to do that for a finite period before it is 100% degraded or changed, and won’t change any further - so for example, an ink that changes colour over a 10 year period, then stops, will, at 15 years old, still only look 10 years old.
*There are inks and processes designed to do that for stock rotation etc - although not in practice AFAIK