Crypto

RBF vs CPFP vs Transaction Accelerator: The Fastest Way to Unstick a Bitcoin Transaction

By Viktor Kuznetsov

Viktor Kuznetsov is Senior Email & Infrastructure Lead i

When your Bitcoin transaction gets stuck in the mempool due to low fees, you have three main options to speed it up: Replace-By-Fee (RBF), Child-Pays-For-Parent (CPFP), or using a mining-pool transaction accelerator. Each method has its own speed, cost, and requirements, making them suitable for different situations.

Why Bitcoin Transactions Get Stuck

Bitcoin transactions can get stuck in the mempool when the fee rate (measured in satoshis per virtual byte or sat/vB) is too low to compete with other transactions. The Bitcoin network prioritizes transactions with higher fees, leaving low-fee transactions waiting in the mempool. If a transaction remains unconfirmed for about 14 days, it will be evicted from the mempool, requiring you to rebroadcast it.

Three Ways to Speed Up a Stuck Bitcoin Transaction

There are three primary methods to unstick a Bitcoin transaction: Replace-By-Fee (RBF), Child-Pays-For-Parent (CPFP), and mining-pool transaction accelerators. Each method has its own advantages and limitations, which we'll explore in detail.

1. Replace-By-Fee (RBF)

RBF allows you to replace a stuck transaction with a new one that has a higher fee. This method requires the original transaction to signal RBF support when it was first broadcast. If RBF was not enabled, this method won't work.

Pros:

• Directly increases the fee of the stuck transaction.
• Can be done quickly if RBF was enabled.

Cons:

• Requires RBF to be signaled in the original transaction.
• May not be supported by all wallets.

2. Child-Pays-For-Parent (CPFP)

CPFP involves creating a new transaction that spends an unconfirmed output from the stuck transaction. By attaching a high fee to the new transaction, miners are incentivized to confirm both the parent and child transactions together.

Pros:

• Doesn't require RBF signaling.
• Can be used with any wallet that supports creating transactions.

Cons:

• Requires access to the unconfirmed output.
• Slightly more complex to set up.

3. Transaction Accelerators

Transaction accelerators are services provided by mining pools that rebroadcast your transaction to their nodes, increasing its chances of being picked up by miners. Some accelerators are free, while others may charge a fee.

Pros:

• Easy to use, often requiring just a transaction ID.
• Doesn't require modifying the original transaction.

Cons:

• Success depends on the accelerator's mining power.
• May have limited availability or usage caps.

Comparison Table

Recommendation

For most users, using a transaction accelerator is the simplest and quickest way to unstick a Bitcoin transaction. It doesn't require modifying the original transaction or having access to specific wallet features. Unled Network offers a free Bitcoin Transaction Accelerator tool that can help you get your transaction confirmed faster.

If you have an RBF-enabled wallet and the original transaction signaled RBF, Replace-By-Fee is a reliable option. For those with access to unconfirmed outputs, Child-Pays-For-Parent provides a flexible solution.

Final Thoughts

Bitcoin transactions can get stuck due to low fees, but there are effective ways to speed them up. Whether you choose RBF, CPFP, or a transaction accelerator, understanding the pros and cons of each method will help you make the best decision for your situation.

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