This is quite simple. You simply have the running system constantly have the file or data be readable to the public. Now anyone can prove that the logs haven't

This is quite simple. You simply have the running system constantly have the file or data be readable to the public. Now anyone can prove that the logs haven't been tampered with. Even better, you can just use a merkle tree data storage solution like Git to make that verification easy and fast. See Certificate Authority for a fully fleshed out solution in this nature. (I guess you could claim that merkle trees are blockchains, but in that case I would argue that the word "blockchain" is pretty meaningless. Just call them merkle trees.)