Abstract: The present invention provides a transaction replacing method, device, and storage medium, wherein the method comprises selecting the predecessor transaction for replacement by means of disposing a predecessor transaction message for the transaction to be stored into the pre-transaction pool, wherein when the predecessor transaction for replacement is still in the pre-transaction pool, marking the predecessor transaction for replacement as discard and storing the transaction into the pre-transaction pool; when a confirmation message of the transaction is received, storing the transaction into the transaction pool and when the transaction is packaged, deleting all predecessor transactions of the transaction. The present invention allows modification of the transaction content before the transaction enters the transaction pool and prevents the predecessor transaction from being sent back.

Abstract: A transaction replacing method, a transaction queuing method, a device, and a storage medium. The method comprises: receiving a first transaction to be stored into a memory pool and transmitted by a client and determining, by means of whether first predecessor transaction information of the first transaction is null, whether the first transaction is a first-type transaction for replacing a predecessor transaction or a second-type transaction not for replacing a predecessor transaction (S12); if the first transaction is a first-type transaction, then querying whether the predecessor transaction of the first transaction is present in the memory pool on the basis of the first predecessor transaction information (S14); and if yes, then deleting the predecessor transaction from the memory pool and storing the first transaction into the memory pool (S16).