I've never used any coins in my life, but I think what is unique here is that the reward IS the entire wallet itself, not just a transaction from the "contest h

I've never used any coins in my life, but I think what is unique here is that the reward IS the entire wallet itself, not just a transaction from the "contest holder". They revealed many of the bits of the private key already. Somehow, you cannot use the wallet without briefly revealing the rest of the private bits.