ALEXANDRIA, Va., June 16 -- United States Patent no. 12,306,969, issued on May 20, was assigned to International Business Machines Corp. (Armonk, N.Y.).

"Privacy preserving asset token exchange" was invented by Kaoutar El Khiyaoui (Zurich, Switzerland), Yacov Manevich (Beer Sheva, Israel), Angelo De Caro (Zurich, Switzerland), Hagar Meir (Tel Aviv, Israel) and Elli Androulaki (Zurich, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for documenting asset exchanges between users by connecting to a first blockchain network configured to store user assets, receiving login data from a first user, receiving an asset lock transaction for an asset from the first user, confirming that the first us...