Assume that the future can change based on your actions, so any historical information that you bring along with you from the intervening 25 years may quickly drift out of the new realities history.
Edit: also assume that you can be given a healthy 21-year-old body if you want or take your previous self’s place.
Further, identification will be provided for you if you were not born at that time.
NFTs are non-fungible tokens. They are literally made for claiming some sort of weird digital ownership of something. There isn’t really another feasible usecase for that technology, even if I agree that that hasen’t been done in a meaningful way yet. If you want to identify the files in that anti-duplication system of yours you are better off using just a regular incremental integer or GUID or something. No need for all the extra steps to the ID card