US Patent 11107321 Distributed ledger based gaming system

A system is provided for securely issuing a ticket for a draw of a game via smart contracts of a blockchain. The system records in the blockchain a game smart contract. The game smart contract records a draw smart contract for issuing tickets for a draw of the game. The game smart contract receives a game place order message indicating placement of an order for a ticket for the draw of the game. The game smart contract sends to the draw smart contract a draw place order message indicating the placement of the order for the ticket for the draw of the game. The game smart contact receives from the draw smart contract a confirmation that the ticket for the draw of the game has been issued. The game smart contract coordinates generation of winning drawlines and directs the draw smart contract to identify winning tickets.