Place these on the back. For paintings, simply fold in between the stretcher and the canvas, leaving the Certificate of Origin text showing.
For prints, use acid free gallery tape and adhere to back of liner.
Here is an example of the Certificate. The actual varies a bit and has registered watermarks, dates and other very subtle and time sensitive markings to eliminate counterfeit certificates. Verifying these is simple. Contact us on the home page and we can check the authenticity for free.