Not quite a sweepstakes- it’s just a standard March madness pool. The one interesting thing is that each bracket confirms to the ERC721 token standard, which means you can trade, buy, or sell brackets.

In that sense, using the ERC721 standard allowed me, a simple dev, to assertive/tokenize a simple digital good. Pretty fascinated by that possibility.

And yes, all written on ethereum. I can post the solidity source of people are interested.