Editor Note: This is the original article originally posted several years ago. This information retains its validity. Additional references to these numbers will be made in other material.
There are strange numbers carved around the entrance to the upper part of the tower at Coral Castle. At both of the points marked in the image below are the numbers 7129 6105195.

Edward Leedskalnin left these numbers here before he passed away. These are engraved twice, in two locations around this entrance.
Here they are:

These numbers have multiple meanings. Like everything at Coral Castle, there is a meaning for the public, and then a deeper esoteric meaning that can often be difficult to understand.
Rumors persist that these numbers are from a citizenship certificate Ed had. These rumors are quite valid! While visiting Coral Castle for myself, I was able to confirm and photograph evidence that these numbers, 7129 6105195 are the same ones shown on this certificate:

Click on the image to enlarge it.
The petition number is 7129, and the certificate number is 6105195, the same as the numbers engraved on the wall.
This “certificate of naturalization” was issued to Ed in 1944, a long time after he had already been in the United States.
It appears as though Edward Leedskalnin was able to have some influence over the numbers he was issued, allowing him to integrate the numbers as another multifaceted clue at Coral Castle.
Many people will prefer at this point to believe that there is no other meaning to these numbers and that is understandable, though I would strongly encourage readers not to underestimate the greatness of the forces at work.

Update
The above sentences were quoted on page 72 in the new (and highly recommended) Coral Castle Book by Rusty McClure and Jack Heffron. And I re-quote from the book:
The site’s [Code 144's] director was not dissuaded from believing the formula significant even after he learned that the number was taken from Ed’s naturalization certificate. Given the passion and, in some cases, the erudition with which the proponents of what is called “ultrascience” state their beliefs, our goal is not to undermine or ridicule, but in this case, the ultrascientists clearly seem to be off base.
My response is that it is precisely this unwillingness to take a risk in one’s thinking that is why the great mysteries so rarely (or never) get solved.
The problem is that unless one is psychologically willing to take a risk of being wrong – to risk believing in something just for a while – one will never put one’s self in a position to see the next step along the way.
Because the very nature of coming to understand something is by progression. And you just aren’t going to see the next step, because you haven’t allowed yourself the perspective. You hold yourself back indefinitely.

It is only by risking enough in your thinking, you will come to have a chance of understanding how true these things are. And that takes inspiration – and a little faith that it might go somewhere, even if you can’t see it right away.
I will not back down on the validity of these numbers and I refuse to subscribe to the parochial thinking that so quickly eliminates the interest of others. I confirm that I continue to have complete confidence in the meaning of these numbers, despite more waiting to be discovered, and that is all I will say on the matter.
In this case the steps have been carefully and strategically laid out by Leedskalnin, and like almost everything he leaves us, there are multiple meanings. These numbers have proved themselves to be a great place to start, and their relevance extends dramatically across the whole of the Coral Castle.
See advanced technical information on these numbers presented in Ancient Knowledge Part 4.