Interactive lesson3 min
Hashing explained: change one character and inspect the result
Turn a message into a fingerprint, then see how a tiny edit changes the result.
Explore the lessonA visual field guide to blockchain
Less mystery.
More understanding.
Unfold the ideas behind blockchain and crypto. Clear explanations, meaningful visuals, and small experiments that make things click.
For curious minds. No technical background required.
Inside a Bitcoin paymentVISUAL NOTE 01
Your input
100,000 sats
Creates two outputs ↓
To the recipient
70,000 sats
Change to you
29,000 sats
The difference: 1,000 sats in fees.
A payment doesn’t just subtract a balance.
It spends an output and creates new ones.
Fictional amounts. The fee is an arithmetic example, not a network estimate.
01
Understand the idea
Start with an everyday question. Leave with a useful mental model.
02
Explore the mechanism
Change an input. Make a prediction. See what actually changes.
03
Build your intuition
Look under the hood with optional technical notes and exercises.
Learn by doing
Aha moments, included.
Interactive lesson4 min
What actually happens when you send bitcoin?
Follow one payment from your wallet to a block, and account for every sat along the way.
Explore the lessonInteractive lesson4 min
Why can a Lightning node send but not receive?
The same channel can have plenty of capacity and very little room for a payment in one direction.
Explore the lessonFollow your curiosity
A few ideas. A bigger picture.
From the fingerprints of data to the journey of a payment. Each topic connects to the next.
One question at a time
Follow a Bitcoin payment.
Find the bigger story.
Start with “what happens when I press Send?” Then follow the connections to keys, fees, confirmations, and payment channels.
Explore the guided path- 1What your wallet controls
- 2How a payment spends an output
- 3Why a confirmation changes the picture
- 4Where Lightning fits in
Stumbled on a new word?
Small definitions for the ideas that keep coming up.