The meaning of that alphabet can be proven two ways: reverse engineer the language, as I have done, or use it and see that it works.

:You may take 8000 Hebrew words and treat them like a giant crossword puzzle. Begin by assigning meaning to prefixes and suffixes and then using them with that meaning. Use a pencil; they may change. Then find all the two-letter sub-roots or contractions, called 'gates'. use their meaning when you find them in other words. Use some rules from a first century hermeneutic: they must always have the same meaning, and if you reverse a gate, there must be a reversal in meaning. This will get you started.