There are several attempts these days to put decentralized identity management on the top of the blockchain. However, these attempts have been failed mostly because there is no way to delete an identity information from the blockchain due to its immutable characteristics. One solution might be to create DLT solutions with the possibility to delete information. As an example, the solution might be to use a standard blockchain solution with state information but simply forget or cut the old transaction or states. A better option might be to design certain state variables with the deleting options. Unfortunately it is not so simple, because of the authenticated data structure of the hashlist.
