# Bitcoin mempool

## Definition

The Bitcoin mempool is the local pool of valid but not yet confirmed transactions that a Bitcoin node knows about and may relay to other nodes.

## What it means in practice

There is no single globally identical mempool: nodes can have slightly different contents because of timing, policy settings and connectivity.

## How this concept appears in Terenval Wallet

A Bitcoin transaction sent from Terenval can appear pending while it is waiting for inclusion in a block after broadcast.

**Important:** If a transaction is pending, check its fee rate and network state before sending another transaction to the same recipient.

**[Install Terenval Wallet](https://wallet.terenval.com/?lang=en)**

## Related terms

- [Pending transaction](https://wallet.terenval.com/glossary/pending-transaction/)
- [Bitcoin fee rate](https://wallet.terenval.com/glossary/bitcoin-fee-rate/)
- [sat/vB](https://wallet.terenval.com/glossary/sat-vbyte/)
- [Bitcoin transaction](https://wallet.terenval.com/glossary/bitcoin-transaction/)
- [Bitcoin block](https://wallet.terenval.com/glossary/bitcoin-block/)
- [Transaction confirmation](https://wallet.terenval.com/glossary/transaction-confirmation/)

## Related Terenval Answers

- [What Is a Crypto Wallet and What Does It Actually Store?](https://wallet.terenval.com/answers/what-is-a-crypto-wallet-and-what-does-it-store/)
- [How to Send Crypto Safely Between Wallets](https://wallet.terenval.com/answers/how-to-send-crypto-safely-between-wallets/)
- [Can the Same Seed Phrase Restore Bitcoin and Ethereum Accounts?](https://wallet.terenval.com/answers/can-same-seed-restore-bitcoin-and-ethereum/)

## Sources and review

- [Bitcoin Developer Guide](https://developer.bitcoin.org/devguide/)
- [Bitcoin Improvement Proposals](https://github.com/bitcoin/bips)
- [Terenval supported networks](https://wallet.terenval.com/info/supported-networks/)

Published by Terenval. Last reviewed: 2026-10-02. Terenval product statements are first-party information.

Official page: https://wallet.terenval.com/glossary/bitcoin-mempool/