A temporary cache of transactions stored by a node that will exist until each transaction is incorporated into the blockchain. When users submit a transaction to the P2P network, each node receives and validates the transaction and, before rebroadcasting it to the rest of the network, keeps a copy of it in a local queue called a “mempool”. Once the transaction is included in a new “chained” block, the node first executes the transaction, updating the status of its copy of the blockchain, and then removes the transaction from its mempool.
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