Mempool Learning Guide
Learn how unconfirmed transactions wait in nodes, propagate, and enter blocks, and how network congestion and transaction fees affect confirmation speed.
What is Mempool
Mempool Mempool is a temporary area where cryptocurrency nodes store unconfirmed transactions. The name is a contraction of “memory” and “pool.” A transaction has been broadcast to the network but has not yet been written to the blockchain, so it waits here for miners or validators to process it.
How Transactions Propagate and Are Filtered
A transaction is sent from one node to its peers and continues to propagate across the network. Nodes check the signature, the relationship between inputs and outputs, and whether the funds have already been spent; transactions that fail these checks are rejected. Each node’s Mempool is not exactly the same, and its capacity and the time at which it receives transactions may also differ.
Congestion, Fees, and Confirmation
Miners and validators generally prioritize transactions with higher fees. When network activity increases and block space is insufficient, low-fee transactions may wait longer or even be removed from the Mempool. Monitoring unconfirmed transactions can help estimate fees and confirmation speed; some networks also support resubmitting transactions with higher fees through Replace-by-Fee (RBF)Replace-by-Fee (RBF).
Original Tutorial
https://www.binance.com/en/academy/glossary/mempool
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