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This application provides a method, apparatus, electronic device, and storage medium for on-chain transactions. It is applied in the field of blockchain technology. The method includes: receiving transaction information input from an upper-layer application through a transaction upload interface; processing the transaction information input from the upper-layer application to generate transactions to be uploaded to the blockchain; temporarily storing the transactions to be uploaded to the blockchain in a local transaction pool; polling the local transaction pool according to a first preset time period to obtain multiple transactions to be uploaded to the blockchain from the local transaction pool; simultaneously uploading the multiple transactions to be uploaded to the blockchain through a batch upload interface; and simultaneously querying the transaction results of the multiple transactions already uploaded to the blockchain through a batch query interface. This application's embodiments achieve universal deployment of contracts and can upload multiple transactions to be uploaded to the blockchain in batches through the batch upload interface, and simultaneously query the results of multiple transactions already uploaded to the blockchain in batches through the batch query interface, improving the efficiency of transaction upload and transaction result query.