[servowire]

I wonder how this deals with like .docx files or .xlsx (Excel) files. Even of you change 0 fields it might end up "mutated" and the Proof does not longer work.

A single flipped byte destroys the entire concept. Tech savvy people can deal with this, but not the average joe.

Cool concept nonetheless.

[inkfactory]

I think you're right - not all smart people are tech savvy or command line hackers - so we offer an easy to use interface and store the file for them.

[servowire]

I'm pretty sure any industry that handles documents etc. that would require a non-forgeable timestamp would not want (or are allowed due to regulation) to upload a billion dollar contract, legal document or patent to a website. No offence.

They would want an in-house, closed system with (of course) blockchain communication for the verification part. Or maybe a tool that creates a "Magic" executable that contains the a) file and b) a "Check" button to do the blockchain verification.