Ah, I actually did something similar years ago. I basically hashed individual pages of my wiki and I think I published the hash of hashes on the Blockchain. Anyway I didn't need it and stop maintaining that system but definitely interesting explorations.
To clarify the hashing was to verify that the pages were indeed modified by me, to prevent tempering.
FWIW as I commented just earlier if you have to verify without relying on memory nor a public note (e.g. sticker on screen) that others could use to pollute your data then use a biometric mechanism, e.g. YubiKey Bio.
To clarify the hashing was to verify that the pages were indeed modified by me, to prevent tempering.
Damn, found it back, was in 2011!
in English https://fabien.benetou.fr/Slideshows/MemoryLoss
in French https://fabien.benetou.fr/Slideshows/MemoryLossPES