This is $200,000 in bitcoins, not actually $200,000.
Rolling your own encryption has always been proven to be the worst idea.
I personally think it's great that people are trying various solutions. Disclaimer: I know little about cryptography
> Q: What if I don‘t trust bitcoins and don’t want them as a prize?
>If the winner prefers conventional money over bitcoin, we will be happy to transfer them 200,000 regular USD instead of BTC.