Provable fairness

From BlockchainGaming Wiki

Provable fairness is a mechanism predating but enhanced by blockchain technology wherein cryptography is used to ensure that random events in games (coin flips, dice rolls, etc) are indeed random and not predetermined or predictable. Typically this is done by placing the seeds used to generate random numbers on the blockchain to be run through the algorithm again later for confirmation; randomness can also be generated from recent block hashes or other unpredictable network outputs. These techniques were pioneered by gambling apps like Satoshi Dice, but were quickly adopted by the general blockchain gaming community. All decentralized MMOs are provably fair by default, since they lack human operators and are typically on transparent blockchains.