code: func (n *Network) userCryptoDir(org *Organization, nodeOrganizationType, user, cryptoMaterialType string) string {
  	return filepath.Join(
  		n.RootDir,
  		"crypto",
  		nodeOrganizationType,
  		org.Domain,
  		"users",
  		fmt.Sprintf("%s@%s", user, org.Domain),
  		cryptoMaterialType,
  	)
  }
docs: // userCryptoDir returns the path to the folder with crypto materials for either peers or orderer organizations
  // specific user