Maintaining a plurality of different sets of data groups for virtualized credentials of a holder includes storing a first subset of the data groups according to a standard for storing data groups, where the standard verifies each data group in the first subset of data groups, storing a second subset of the data groups as a plurality of auxiliary data elements that are separate from the first subset, where auxiliary data elements are not directly accessible using the standard, providing at least one custom data group in the first subset that verifies each of the auxiliary data elements, and verifying at least one of the auxiliary data elements using the custom data group and verifying the custom data group using the standard. The standard may be ISO 18013. The digital signature may be provided by a party that is trusted by a relying party that receives data from the holder.