Yeah, but then the miners can manipulate the market. In this case, only I can!

Jk, you're totally right. I should do that next time.

If you want an outcome that is unknown to yourself, too, you could use "the last digit of the hash of block #915999 is even/odd".

Scroogey

Edit: End time has been set to one week from now, at midnight EST.

oracle

I saw the new the user-created markets feature on Predyx and had to give it a try. I just flipped a coin, and hashed the outcome as follows:

sha256("outcome-secret string")

SHA-256 Hash: 4349be1ba39869d64d60a375a88cb702540456040fce5cc830ec1eae4c75c376

At midnight, I will reveal the outcome and secret string, to ensure fairness. 

Choose "Yes" for heads, "No" for tails!

https://beta.predyx.com/market/kens-coin-flip-1758135898