A blockchain-based data processing system may comprise: a transaction-side blockchain node and a server-side blockchain node on a blockchain network maintaining a blockchain. The transaction-side blockchain node may be configured to: create a transaction data structure based on an Unspent Transaction Output (UTXO) model, consolidate transaction data of a transaction according to the transaction data structure to generate shared transaction data, execute a smart contract of the transaction-side blockchain node to automatically determine a to-be-settled commission amount, update the shared transaction data according to the to-be-settled commission amount, collect the updated shared transaction data according to a preset condition, and send a to-be-settled transaction processing request comprising the updated shared transaction data to the server-side blockchain node. The server-side blockchain node may be configured to: receive the to-be-settled transaction processing request, and calculate a sum of the to-be-settled commission amount in the updated shared transaction data.