There often lack of transparency in some competitions like forexample when you buy soda you send the code or the more play by the sending the code by where at the end proof and winner is determined by traditional corrupted computer systems and some times by people as adjudicators who are corrupted for personal gain,baised and corrupted so using blockchain smart contracts could be executed by computational algorithm rather than untrusted human agents through smartcontract computer programs to select winners of which these are decentralized and non corruptiple with immutable record keeping which is transparent