The history of Middle-Earth (chibi version): Part 67: Crime and punishment
Apparently, I'm not the only person amazed I've created 67 of these so far with only two breaks... :) And yes, Melkor's blindfold is mentioned in canon.
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Part 67: Crime and punishment
Next time: Part 67: RSVP
Chibis by tektek.org
Regarding Melkor's immortality, I hope you're not taking as canon that silly faux-Ragnarok Dagor Dagorath. Tolkien fiddled with his legendarium a little too much at times.
I'm picturing Melkor's cell in Mandos with 1,095,750 hash marks scratched into the wall.