What is the Bitcoin mempool?
The mempool is the collection of valid Bitcoin transactions a node currently knows about that have not yet been confirmed in a block. Each Bitcoin node maintains its own local mempool according to the transactions it has received and its policy settings.
Because mempools are local rather than one global database, two healthy Bitcoin nodes can show slightly different transaction counts at the same moment.
Why mempool activity matters
Mempool conditions help explain transaction delays and fee competition. When many transactions compete for limited block space, higher-fee transactions may be selected first by miners.
Watching mempool activity alongside fee estimates can therefore provide better context than looking at either metric alone.
UnlockPool's network view
This page presents the network view available to UnlockPool's own Bitcoin infrastructure. That makes it useful as an independent reference when comparing wallet estimates, transaction status or another public explorer.
Values change continuously as transactions arrive, transactions are mined and new blocks are accepted by the node.
Frequently Asked Questions
Is there one global Bitcoin mempool?
No. Each Bitcoin node maintains its own mempool, so transaction counts can vary slightly between nodes.
When does a transaction leave the mempool?
Most transactions leave when they are confirmed in a block, although transactions can also be removed for other policy or resource reasons.
Does a large mempool always mean high fees?
Not necessarily, but greater competition for block space can influence the fee rate needed for faster confirmation.