> how can we certify that the same asset doesn’t exist as two or more NFTs on different block chains You can't. But surely some wise guy is pitching a blockch

> how can we certify that the same asset doesn’t exist as two or more NFTs on different block chains You can't. But surely some wise guy is pitching a blockchain for that right now. It's actually worse, the same certificate could exist on multiple blockchains, and none of them guarantee approval by the original artist; all could be legally void certificates of nothing.