I sent an email to Panini about this exact idea about 6 months ago. I suggested they just have a photo of every multi colour patch card as it is made so any collector could just send a pic of the card by email and they can cross check it and confirm if its real.
They can't make the database public I reckon, otherwise people will shop for the nicer patches and not buy the ones with weaker patches! lol
While the rep did agree it was a great idea, they said they are not sure if it is able to be done (no doubt cost reasons)!
They did however, tell me that they already offer an authenticity checking service, however it requires you sending the card to them!