code: protected boolean isSignMessageURI(String uri) {
      LoaEnum loa = LoaEnum.parse(uri);
      return (loa != null && loa.isSignatureMessageUri());
    }
docs: Predicate that tells if the supplied URI is a URI indicating sign message display.
  
  @param uri
  the URI to test
  @return {@code true} if the supplied URI is for sign message, and {@code false} otherwise