That's a great point, but isn't the arguement to make that information employee owned, so no real connection with companies and GDPR?
The chain likely wouldn’t be more than “an item with secure hash Foo exists. Here it is, encrypted using whatever method its owner deemed acceptable at the time (maybe not even the latter. If I own the data, I should be able to improve its encryption, or remove it altogether)
That has some value; employees wouldn’t be able to retroactively insert stuff, but that’s about it.
Do you see there being any alternative option (not sure if Berner's Lee Solid can play a part here)?
A company called Velocity Labs has done a private blockchain where third parties issue credentials on a 'Career Wallet', but it's more on verification of employment, courses and such.
If you think about it, current solutions (including Linkedin's recommendations) are the same thing, just centralized.
There must be a way to change that.