Bitcoin Core adds a mempool fee estimator
A second fee estimator was merged into Bitcoin Core on 21 August 2026. It reads the mempool as it is now, and it is only allowed to lower the number the old estimator gives you.
Bitcoin, built for people.
How Bitcoin works, how to use it, and what happened this week. Sourced, and honest about the limits.
The library
Browse everythingExplainers
16What a thing is, assuming nothing. Start here if the words are new.
- Soft forks, hard forks, and what a chain split is
- What the courts have decided about the claim to be Satoshi
- What a Lightning invoice actually is
- Bitcoin 101: What the Lightning Network is
Guides
10Sit down and do one thing, with a way to check it worked.
- How to set up and use a Bitcoin wallet
- How to make your first Lightning payment
- How to run your own Bitcoin node
- How to buy bitcoin in Argentina with Lemon
Deep Dives
9The mechanism underneath, with the spec and the constants.
- The 2018 hash war, and what hashrate cannot decide
- Bitcoin has no balances, only unspent outputs
- How Bitcoin holds a ten-minute block interval
- The Lightning implementations, and how they differ
Features
13An argument, with the strongest version of the other side.
- The block size war, and what it settled
- Nobody is in charge of Bitcoin, which is the hard part
- Why You Should Accept Bitcoin at Your Beachfront Business
- Texas passes a Bitcoin reserve law: what changes