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Another option is to use a filesystem such as btrfs or zfs which stores checksums in metadata, then use the included tools to verify file integrity and identify bit rot.
https://btrfs.readthedocs.io/en/latest/btrfs-scrub.html
https://openzfs.github.io/openzfs-docs/man/8/zpool-scrub.8.html
s/bibtrotted/bitrot/
Reminds me a bit of tripwire, I wonder if that could be integrated.