[notyourday]

If the claim is that the private data unrelated to bitcoin transactions is being published and verified on a bitcoin blockchain then this is a scam.

It is absolutely amazing that the person who wrote this article still has a title of a Senior Editor that claims to write on this topic.

[ujal]

It is possible to hash the data and make that hash part of the transaction [0].

[0] https://arxiv.org/abs/1502.04015

[notyourday]

That's not the application, however.