code: def get_certification_document(current_block: dict, self_cert_document: Identity, from_pubkey: str) -> Certification:
      
      # construct Certification Document
      return Certification(version=10, currency=current_block['currency'], pubkey_from=from_pubkey,
                                    identity=self_cert_document,
                                    timestamp=BlockUID(current_block['number'], current_block['hash']), signature="")
docs: Create and return a Certification document
  
      :param current_block: Current block data
      :param self_cert_document: Identity document
      :param from_pubkey: Pubkey of the certifier
  
      :rtype: Certification