What is a satoshi?
A satoshi (sat) is the smallest unit of Bitcoin.
- 1 satoshi = 0.00 000 001 BTC
- Bitcoin transaction fees are measured in satoshis per virtual byte (sat/vB) — higher sat/vB means faster confirmation.
What does sat/vB mean?
- sat/vB = satoshis per virtual byte (the fee rate for your transaction).
- Fees depend on transaction size, not the amount of Bitcoin sent.
- The higher the fee rate (sat/vB), the more likely miners will prioritize your transaction.
How long do Bitcoin transactions take to confirm?
Bitcoin transactions are typically confirmed within 10–60 minutes, but it depends on the fee rate, network congestion, and transaction size. High-fee transactions confirm faster, while low-fee ones may take several hours or even days if the network is busy. You can speed up confirmation using RBF or CPFP if needed.
How long should I wait before taking action?
If your transaction is unconfirmed for a few hours and fees remain high, consider using RBF or CPFP.
If the network is less busy, waiting 12–24 hours may be enough.
Can I cancel a Bitcoin transaction?
No, Bitcoin transactions cannot be canceled once they are broadcast to the network.
However, if your transaction is marked as “replaceable” (RBF-enabled), you can replace it with a higher-fee transaction or send it to a different address. This effectively overrides the original transaction.
What is Replace-by-Fee (RBF)?
RBF lets you replace an unconfirmed transaction with a higher-fee version to speed up confirmation.
- Only works if RBF was enabled when the transaction was sent.
- Trezor Suite enables RBF by default.
What is Child Pays for Parent (CPFP)?
CPFP lets you spend an unconfirmed transaction with a higher fee, so miners will confirm both at the same time.
- Use CPFP if you received Bitcoin with a low fee and want to speed it up.
- If you sent Bitcoin but can’t use RBF, CPFP may work if you have an unconfirmed change output available.
What is a mempool, and what is mempool.space?
A mempool (short for “memory pool”) is a temporary holding area where unconfirmed Bitcoin transactions wait before being added to a block. Each Bitcoin node has its own mempool, and miners select transactions from it based on fee priority — higher-fee transactions get confirmed first.
mempool.space is a block explorer that lets you view the Bitcoin network’s mempool in real time, including current fee estimates and transaction status. It’s a useful tool for checking whether your transaction will likely be confirmed soon.
Other Bitcoin block explorers include:
Tip: If you want to track a specific transaction, find the TXID in Trezor Suite and paste it into a block explorer like mempool.space or Trezor’s explorer.
What is Mempool Accelerator™?
Mempool Accelerator™ is a third-party service that lets you pay miners directly to confirm your transaction faster.
- Works even if you’re not the sender or receiver of the transaction.
- Useful when RBF or CPFP isn’t an option.
- Always check the service’s terms and fees before using it.
For more details, visit the Mempool Accelerator page.
Do RBF and CPFP only work for Bitcoin?
No, these techniques also work for other UTXO-based cryptocurrencies, including:
- Bitcoin (BTC)
- Litecoin (LTC)
- Bitcoin Cash (BCH)
- Bitcoin SV (BSV)
- Dogecoin (DOGE)
For Ethereum and similar blockchains, fee bumping works differently, usually by increasing the gas price of a pending transaction.
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