Did anyone found out yet what hashing linkedin.com uses?

Looks like some sort of security by obscurity to me. If i knew the hash, i might have an open redirect here?

http://www.linkedin.com/redir/redirect?url=http%3A%2F%2Ftalent%2Elinkedin%2Ecom%2F%3Fpin%3Dtr02&urlhash=zJmW

Or maybe it's a honeypot to waste "hackers" time, and they check which sites are linked, or if javascript code is inserted...

My guess is that it's a hashed ID for a record, so yeah probably security by obscurity. Try to generate a table with a million hashed integers and slice it on four characters, you might find the id. But with the id you can't do anything.