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Comment by kernelPan1c | Hacker News Reader

How does this work?

The source code (JavaScript) is quite readable.

This seems to be the backing store:

With the ability to get a specific key from this style of URL:

And post to it to set a value.

There's no security though - anyone can overwrite any URL - e.g. in the console on that page:

    pushJSON(endpoint + '/AAAAaaAaAaaAAaaAAAAAaAAAAaAAaAAaaaAAAAaA', 'http://www.example.com/');

Looks like there's a limit to the number of urls shortened... it's throwing out the old ones. Womp, womp. :P

Or some people are Curling random stuff into the JSON endpoint

I'd bet money it's just binary represented in uppercase and lowercase.

AAaAAaAAaaaaaaaaaaAaAAaaAAAaAAaAAAaa = 110110110000000000101100111011011100 = [Some ID in the database]