Bitcoin is been studied by many Islamic scholars in different levels and accordingly different verdicts have come from different scholars while many leading scholars (Maraaje' of Taqleed) have not issued any verdict waiting for information or research.
Ayatullah Sistani did not issue any verdict regarding Bitcoin till now.
There are scholars in Najaf Ashraf and Qom who say that dealing with Bitcoin is permissible as far as it does not violate the law and does not harm any one.
NFT is still under research among many scholars but the problem with it is lack of evidence that it deals with really existing material. Till we hear a clear verdict from an authentic Marja' of Taqleed, we need to wait unless you are sure that you are buying or selling an existing material.