Understanding Transaction Finality
The mem-pool is where transactions wait to be inserted into a block.

The mem-pool is where transactions wait to be inserted into a block. Each block producer node needs to maintain its mem-pool. Having control over the mem-pool is an advantage that can be abused.
In the article, you will learn what mem-pool is used for. We will explain how a front-running attack works. What is Mem-Pool? In a distributed network, there is no central point that controls the production of blocks.
In the Cardano network, one node (slot leader) is randomly elected approximately every 20 seconds and gets the right to mint a new block. Block producers (or pools) are located all over the world and a new pool can be launched at any time and anywhere. When a user submits a transaction to the network, it must reach all pools.
This is because it is not known in advance which Read article: Understanding the Cardano Mem-Pool
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