Data processing method and apparatus based on multi-blockchain, electronic device, computer-readable storage medium, and computer program product

A data processing method performed by a first consensus node in a first network of a multi-blockchain, includes: obtaining a clearing transaction request submitted by a service object; performing verification on an identity authority of a service clearing node to obtain an identity authority verification result; invoking a first authority clearing contract associated with a first authority contract to obtain first service data and first ledger data; obtaining first contract data corresponding to the first ledger data from a contract database corresponding to a first main chain; using the first service data, the first ledger data, and the first contract data as first clearing response information corresponding to the clearing transaction request; and returning the first clearing response information to a first-type clearing node having authority to obtain the first service data, to cause the first-type clearing node to recover a sub-ledger corresponding to the first ledger data.