Ethereum blockchain smart contracts, in their design, allow for carrying out a pre-programed task in the exact same way every time they are called

BITWIN wanted to take advantage of that and deploy a solution that is easily verifiable, because fairness is currently one of the main concerns regarding online casinos.

Considering these factors, we decided to use smart contracts to provide a provably fair random number generator. In order to generate random numbers, the smart contract will be using repeated hashing function to generate a stream of random numbers, as big as is required for the player to play the game seamlessly.

This solution allows anybody interested to verify the randomness by dehashing last revealed hash output and comparing it to the outcome on Ethereum blockchain. This method can be used not only in games such as slots, but also in a multi-player games like Blackjack or Roulette. Each participants reveals his/hers hash function output one at a time, thus generating one random number per round.

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