Is there a flaw in this ECC blind signature scheme?
This paper—if I have guessed correctly through the broken link—is bogus.  It fails to distinguish points on the curve from elements of the coordinate field and doesn't prove anything and even if you fix that by pretending any of it makes sense the whole thing is trivially breakable.  Throw it away and forget the whole ordeal—except don't forget that the ‘Journal of Networks’ is a bullshit-publishing paper mill.