We are conducting proof of concept for DID issuer method for Transferable Documents. As mentioned in the Tradetrust documentation DID works well for verifiable documents.
However while building DID support for a Transferable document like Bill of Lading, the identity of the issuer becomes important as explained in the below Trade Trust document.

DNS provides a clear and recognizable domain name directly linked to the domain owner's identity. In contrast, DID utilizes a wallet address, which is a complex string of characters that lacks direct association with a specific individual or organization.
For experimenting we tried to create a transferable document with the DID method, we could create the document but while verifying it was visible as verifiable document rather than Transferable.
Identification of the document issuer remains a challenge for DID based Transferable document.
In your latest version V5 documentation, the below table shows that "Identifiable issuer" is not available for Transferable documents under DID on Tradetrust. We are in the process of upgrading our dapp to V5. Can you guide us more on this ?
