I've been working on something similar to this idea.  My question is how are they linked?  Is it just that they are carrying matching numbers or is there a private key somewhere on the coin that is holding an NFT on the blockchain?  I've been waiting to see how long before I started seeing these types of things.  Very cool.  I wish you the best of luck with this project and hope that you continue to innovate interesting NFT products as the space is the next frontier of crypto and in my opinion most likely crypto tech to be adopted and actually used by the masses.