"The application details that, instead of letting a new block store transactions from its previous one, a data compressing system could be used to pack transactions from multiple blocks into what the patent calls a "data block."

https://www.coindesk.com/bank-of-china-thinks-it-has-a-solution-to-the-blockchain-scaling-issue/

Did you know why china needs this thing for the system run the packed data through function with hash value.