"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.

Bank of China Moves to Patent

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."
For instance, as the patent application describes, once the system receives a request to compress transactions from block 1 to 1,000, it causes a new data block to be formed and temporarily hosted on a different storage system. The system will then run the packed data through a hash function with a hash value.