There's a 10 BTC bounty for knowing the server secret. You can claim it by doing nothing more than just spending from it (it's a private key, for address with 10 BTC in it). That's because if you know the server secret, you could cheat the game anyway, so I would prefer if someone does discover it (it's stored in the database along with the hashes) you just take the 10 BTC, which will act as a bounty for you and a trip wire for me