NFTs will be available in Summer 2021, according to Sega, the video game company behind Sonic the Hedgehog. NFTs are one-of-a-kind crypto assets that can be used to display artwork, video, or any other type of digital or physical material. They're usually created on Bitcoin blockchain, which allows them to be exchanged or sold to others. My Crypto Heroes and My Crypto Saga are two digital trading card games developed in Tokyo.