The power of distribution

How did they measure the speed of completing?
I'm guessing that once you finish the puzzle, the QR code takes you to a website and that is your proof of finishing. Without the completed puzzle, it won't produce an exact QR code with the exact link.
 
I'm guessing that once you finish the puzzle, the QR code takes you to a website and that is your proof of finishing. Without the completed puzzle, it won't produce an exact QR code with the exact link.
Would that not make the puzzle a gigantic QR code?
 
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