Is there an app for scanning concert tickets to se if it is good or not?

Is there an app for scanning concert tickets?

Just wondering if it is out there yet.
It seems like buying concert tickets out in front of the arena is a
different way of life now.
No more ticket master tickets? (unless at the box office?)
It seems like the majority of tickets are printed on a persons home
computer on a 8.5 x 11 sheet of paper.
There is no way to know if it is good when outside the venue.
By now there should be some kind of application that could read and
say if the ticket is good?

Just wondering.