Unsigned Document Handle
class UnsignedDocumentHandle
Wrapper around an EUDI UnsignedDocument.
This represents:
a newly created but not-yet-stored SD-JWT VC document,
including PoP (Proof-of-Possession) key material.
It is used during OpenID4VCI issuance:
App creates an unsigned document via documentManager.createSdJwtDocument()
Issuer signs it
SDK stores it