This is exactly what we built at https://assembl.net with blockchain timestamping (and it really worked/works)!!! We had many researchers using it but sadly failed to commercialize.

We called it Assembl Chronos. It’s now available here at https://provenance.cerebrum.com. Please give it a try, I’d love to hear your thoughts :)

(More info: https://www.prnewswire.com/news-releases/assembl-chronos-a-b...)