FAQ

Last Updated: December 25, 2025

This FAQ covers common questions about BTC Tools, how the Service works, and feature topics (such as RBF). As new features are added, new sections can be introduced without changing the overall structure.

General

What is BTC Tools?

BTC Tools is a non-custodial Bitcoin utility for analyzing and constructing transactions. It does not custody funds or execute transactions on your behalf.

Is BTC Tools a wallet or exchange?

No. BTC Tools is a utility for transaction analysis and construction. It does not hold balances, custody funds, or provide exchange services.

Can I use BTC Tools without connecting a wallet?

Yes. You can analyze transactions, view details, and calculate fee changes without connecting a wallet. To sign and broadcast a transaction, you need a wallet that supports the required feature.

Wallets and Signing

Does BTC Tools custody my funds or store private keys?

No. BTC Tools is non-custodial. We never see or store your private keys, seed phrases, or wallet passwords. Signing happens in your wallet software.

What wallets are supported?

BTC Tools supports multiple wallet adapters (browser extensions, etc.). The exact list depends on the current build. If your wallet can sign PSBTs for a given feature, it should work.

RBF (Replace-By-Fee)

What is BTC RBF (Replace-By-Fee)?

RBF is a Bitcoin feature that lets you replace an unconfirmed transaction with a new version that pays a higher fee. This helps speed up confirmation when the mempool is congested.

When should I use RBF?

Use RBF when:

  • Your transaction is stuck or slow to confirm.
  • You want to increase the fee to improve confirmation time.
  • You need to change a transaction detail before it confirms (e.g., fee rate).

RBF only works for unconfirmed transactions that were flagged as replaceable.

Does RBF "double spend" my transaction?

RBF creates a new version of the same transaction that supersedes the old one in the mempool. It does not create extra spending of your funds on-chain. Only one version can confirm.

How do I know if a transaction is RBF-enabled?

A transaction is usually RBF-enabled if it uses sequence numbers less than 0xfffffffe. Wallets may label this as "replaceable" or "RBF" in their UI.

Why did my replacement transaction fail to propagate?

Common reasons include:

  • The new fee rate is not sufficiently higher.
  • The replacement violates mempool policy rules.
  • The original transaction already confirmed.
  • The replacement conflicts with other unconfirmed transactions.
Can I lower the fee with RBF?

No. RBF is designed to increase the fee. A replacement must pay a higher fee than the original to be accepted by most nodes.

What is the difference between RBF and CPFP?
  • RBF replaces your unconfirmed transaction with a higher-fee version.
  • CPFP (Child Pays For Parent) creates a new child transaction that incentivizes miners to confirm the parent.

BTC Tools supports RBF workflows today; additional tools may be added over time.

Is RBF guaranteed to confirm my transaction?

No. RBF improves your chance by increasing the fee, but confirmation still depends on mempool conditions, miner policies, and network congestion.

Where can I learn more about Bitcoin RBF?

See the Bitcoin Core documentation and trusted Bitcoin education resources. Always verify information before using it in a live transaction.