Bitcoin only.
No altcoins. No tokens. No "crypto." Other coins have other sites. We have one.
The Bitcoin School
For people who want to understand Bitcoin. Not flip it.
Plain language. Sourced chapters. Live on-chain data from a real node. Huge glossary, Rabbit Holes, and one opinionated Journey from "what is money?" to running a full node. No altcoins, no affiliate links, and no signup needed to read any of it.
From the glossary
A custom Bitcoin address starting with specific characters (e.g., 1Pizza...), generated by repeatedly searching for a matching prefix.
Read full entryNew on the site.
-
Rabbit Hole · 15 min
Which Coins Does Your Wallet Spend?
Your wallet does not have a balance. It has a bag of coins, and every payment starts by choosing which to spend. What that choice costs today, what it costs later, what it tells a chain analyst, and how the reference wallet decides, with four algorithms and one score.
-
Rabbit Hole · 15 min
Use It Once: Why Reusing a Bitcoin Address Is Dangerous
One bitcoin in four sits at an address that was spent from and then paid again. What a reused address gives away, to whom, why it keeps happening eighteen years after the whitepaper said not to, and how to stop without rushing.
-
Rabbit Hole · 40 min
Rat Poison, Tulips and a Pet Rock: Everything Bitcoin's Been Called (so far)
Bitcoin is dead, they said, and a Ponzi scheme, a tulip bubble, rat poison and money for drug dealers and terrorists. Every label, who said it and when, which ones can actually be scored, and what happened next, including the calls that held up and the ones our own side got wrong.
No bullshit.
No price predictions. No affiliate-bait. No fear marketing. Every chapter cites its sources, and the live on-chain numbers come straight from a full Bitcoin node.
Have fun.
Interactive, opinionated, well-crafted. Rabbit-hole vibes. Built by Bitcoiners for people who want to actually understand.
Down the rabbit hole.
All rabbit holesCustody and Privacy
How do I hold it safely and privately?
- Mt. Gox to FTX: The Custody Graveyard
- Privacy on Bitcoin: What Works and What Doesn't
- Use It Once: Why Reusing a Bitcoin Address Is Dangerous
Hard Questions
The strongest objections, including where the critics are right.
- Quantum and Bitcoin
- Bitcoin and Energy
- Rat Poison, Tulips and a Pet Rock: Everything Bitcoin's Been Called (so far)
Corrected in public.
All corrections-
The window's upper bound is the payment plus its fee plus the cost of creating and later spending a change output, which is how Bitcoin Core defines cost_of_change for SelectCoinsBnB in src/wallet/coinselection.cpp (created at the transaction's fee rate, spent at the discard fee rate).
What was wrong -
Bitcoin Core 29.1 (September 4, 2025) lowered the default minrelaytxfee and incrementalrelayfee to 100 satoshis per kvB, which is 0.1 sat/vB; 30.0 (October 10, 2025) restated the same two defaults in sat/vB. The entry now dates the change to 29.1 and cites both release notes.
What was wrong -
It now says the flag marks those coins and sendtoaddress skips them, while Core's other send commands and its GUI do not, so coin control and freezing still do the job by hand. Confirmed on a Bitcoin Core 31.1 regtest node on 2026-10-20.
What was wrong