code: func GetChaincodeProposalPayload(bytes []byte) (*peer.ChaincodeProposalPayload, error) {
  	cpp := &peer.ChaincodeProposalPayload{}
  	err := proto.Unmarshal(bytes, cpp)
  	return cpp, errors.Wrap(err, "error unmarshaling ChaincodeProposalPayload")
  }
docs: // GetChaincodeProposalPayload Get ChaincodeProposalPayload from bytes