What is Mempool? How Mempool Works in Bitcoin System

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2022-07-27 13:07:44

What is Mempool? How Mempool Works in Bitcoin System

What is Mempool?

The mempool is where all the unconfirmed transactions a node can see on the Bitcoin network.

Each node has the ability to store different unconfirmed transactions. Thus, each node has its own version of pending transactions. This explains the variety of Mempool sizes.


How does Mempool work?

Bitcoin transactions are sent through a network of peer-to-peer connections, called nodes. Each node has its own set of unconfirmed transactions sent to it by other attached peers. Nodes confirm or invalidate transactions on a number of criteria including the correct cryptographic signature, if the amount spent is double, or if the input amount is greater than the output amount.

How does Mempool work?
How does Mempool work?

Valid and invalid transactions are then broadcast to other nearby nodes. Valid transactions are selected by mining nodes to be encapsulated in a block after a sufficient number of nodes have propagated valid transactions across the network. Nodes remove invalid transactions from their mempool when asked to do so by their peers.

Mempools can be measured in a number of ways, but are typically implemented in terms of fee per byte or satoshi per byte (sats/byte).

The connection between Mempool and transaction fees

If we consider the mempool as a waiting room, when it is congested, there will be a high amount of transactions waiting to be released. Normally, transactions move smoothly in and out of the mempool as they are verified and added to the block, but sometimes, the mempool can become congested.

Congestion periods can often stem from high trading volume or a sudden drop in trade hash. During these times, the mempool becomes congested and delays can occur, resulting in increased transaction fees.

The term “trade hash” refers to the difficulty of blockchain mining. There may not be enough miners to handle the complexity or congestion of the blockchain at the time. As a result, some transactions have to wait longer to be confirmed.

Each Bitcoin transaction sits in the mempool until it is ready to be confirmed, but there is no unique mempool. Every node has an associated mempool, and by default, the mempool usually doesn’t exceed 300 MB.

When the mempool is congested, users have the option of paying higher fees, which can push their transactions to the top for faster confirmations. Otherwise, transactions with lower fees will stay in the mempool, where they will remain unconfirmed until the bottleneck is resolved. Similarly, during periods of minimal congestion when transaction volume is low, fees will be correspondingly lower. Once a transaction is selected and added to a confirmed block, that transaction is removed from the mempool.


Above is the basic information about the mempool that CHK synthesizes. CHK wishes you success and make a lot of profit from this potential market.

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