A lottery is the humanity's most ancient form of entertainment. Also considered to be a form of gambling, lotteries, in most countries, require licensing and, in some countries, they belong exclusively to the realm of the state-run monopolies. World-wide, lotteries represent multi-billion dollar businesses and cryptocurrencies offer them now new and unique opportunities for running a transparent and honest lottery game where the smart contracts determine and distribute the winnings and the blockchain technologies preclude the human factor from creating errors or fraud in the game.