ALEXANDRIA, Va., June 2 -- United States Patent no. 12,646,064, issued on June 2, was assigned to HITACHI LTD. (Tokyo).

"Distributed ledger system and control method for distributed ledger system" was invented by Tatsuya Sato (Tokyo), Taku Shimosawa (Tokyo) and Satoshi Ito (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A distributed ledger system is constructed by communicably connecting distributed ledger nodes that each of a plurality of organizations has, and is capable of executing a smart contract. The smart contract manages information in a distributed ledger while building consensus among the distributed ledger nodes of the plurality of organizations. The distributed ledger node executes the sm...