hash
@SerialName(value = "hash")
@Serializable(with = ByteArrayBase64Serializer::class)
CSC Data Model 1.0.0 section 8.2: REQUIRED Document digest, encoded as a standard Base64 string (the decoded digest bytes). For example, bytes 07 08 09 are represented as "BwgJ" in JSON. This is distinct from the structured at.asitplus.csc.datamodel.basic.Hash checksum used by DocumentReference.