ALEXANDRIA, Va., May 26 -- United States Patent no. 12,639,682, issued on May 26, was assigned to Block Inc. (Oakland, Calif.).

"System-based detection of card sharing and fraud" was invented by Victor Tsou (Oakland, Calif.), Alan Fineberg (San Francisco), Kathryne Hawthorne (San Francisco) and Damon Mccormick (Oakland, Calif.).

According to the abstract* released by the U.S. Patent & Trademark Office: "This disclosure describes, in part, a payment service predicting that use of a payment instrument is fraudulent. In examples, a user profile and associated account may be stored in a data store associated with the payment service. The user profile may include an identifier of a payment instrument and historical transaction data for transac...