This has been around for quite some time. It was discovered by some scholars in Israel who were studying the Dead Sea Scrolls. They ran the texts--Hebrew letters correspond to numbers-- into a computer and found geometric matrices all over the text, like a 'word-find' puzzle. The matrices change depending on how many figures yoo assign to a particular row. It sounds far fetched at first, until you start to run the probabilities. Then, the chances of random occurrence become too lopsided to ignore.
These matrices include Messianic references threaded throughout books such as Isaiah and the Psalms. It's real.
As far as concrete proof, that's going a little far. Concrete proof won't happen until Jesus comes again. It's a pretty clear slap on the face to the more analytical among us, though.
I will warn you, that if you Google this subject, you will find lots of flaked out goofiness along with the legit. Plus lots of skeptical crap.
I haven't looked into this, so I don't know for sure if it's legit or a fraud, but one thing to be aware of is that Hebrew scriptures contains ONLY CONSONANTS. This may make it easier to find such words.
Actually, it might depend on what one defines as concrete proof.
The elegance and complexity of some of the codes is mind boggling enough to be a pretty concrete form of proof of God's timeless majesty.
Some appear to be holographic and certainly some are 3D.