Is this a DOI ?

I am trying to get an article but it has an invalid DOI : JEUR-06-2003-16-2-0993-9857-101019-ART2 

Are all the Sci-Hub webstites down ?

I tried many mirrors (like a dozen or so), but all of them look like they have been taken down.. Is it just me, or are there other users in the same situation ?

Is LibKey legit?

Randomly came across them. I wanted to see what other people thought before I accidentally downloaded a virus lol. “LibKey.io is a service sponsored by libraries to help researchers access content and avoid unnecessary paywalls.” https://libkey.io/ Tweets by libkey_io