Thanks for the advice! I greatly appreciate it will work on a solution. I will look to broadcast the server hashes each round on the blockchain and then use the block_id from that block.
Do you think you might open it up for other people to run their own provably fair lotteries / raffles using your system for a fee?
What do you have in mind exactly? I want to release the tool to verify all bets by Tuesday, that will be available for everyone to use.
RE: Fairlotto V2: Provably Fair STEEM Blockchain Based Lottery - All New Front-End + Features