HotBlock is an easy but exciting double-or-nothing game based on Ethereum smart-contracts.. You bet ETH on any future block in Ethereum blockchain. Every block has a 50/50 chance to become hot after mining and double your ETH. Only a few clicks to make a bet – your luck does the rest. HotBlock is transparent and secure. All winnings are paid out automatically, the results of the bet cannot be tampered with, and all of the code is open to public. Give HotBlock a try, it's everything the player needs and nothing more.