Thank you Erica for this abundant sharing of your research and experiments into this strange terrain. I must admit every time I hear an explanation of NFTs I find myself only marginally closer to really grasping it the way advocates sound. But that is progress.
Your range of examples do help, as does your piece on NFTs for Open Education and Open Culture. And the rights issue plays out somewhat understandably for art or virtual real estate, but wondering what are the things we would want to declare certificate proof for something in the learning process.
As part of our work to add examples like this I have been adding as annotations some of your references to the relevant portion of the UNESCO Recommendation on OER for sustainability.
Keep on sharing, much appreciated.