Why can’t a digital file
be spent twice?
A record can be copied, but the network recognizes only one shared history.
BITCOIN, EXPLAINED VISUALLY
Understand Bitcoin
without becoming an expert.
No finance or coding background needed. Learn why Bitcoin works through animation, diagrams, and hands-on experiments.
◇No prices · No picks · No exchange referrals
01Record
a1b2…9f3c02Verify
✓
b7c4…2d8e03New block
c3d9…7ab1↳Every block preserves a piece of verifiable history
NEW TO BITCOIN
Take the 3-minute tour
Follow one record through six key steps.
CURIOUS HOW IT WORKS
Follow a learning path
Six questions, real experiments, and checks.
HAVE A QUESTION
Search for an answer
Start with your question, in any order.
Three questions for the right mental model
Start with an ordinary question
Why can’t a digital file
Without a bank,
who keeps the ledger?
Thousands of nodes store, check, and update the same ledger together.
Why only
21 million?
The issuance schedule lives in the rules and cannot be changed on a whim.
EXPLORE BY QUESTION
Turn every doubt into a focused answer
Standalone pages can be saved, shared, and checked against primary sources. Start with six common questions.
01
Open the knowledge library→What exactly is Bitcoin?
Separate the network, the rules, and BTC as a unit.
→02Why can’t it be spent twice?
Digital information can be copied—why not ownership history?
→03Why near 21 million?
See the supply limit through subsidies and halvings.
→04What does mining do?
Understand proof of work: hard to produce, easy to verify.
→05Who controls Bitcoin?
Separate the powers of developers, miners, nodes, and users.
→06What does a private key prove?
Learn keys, addresses, signatures, and self-custody responsibility.
→FLAGSHIP EXPERIENCE
Bitcoin in 3 minutes
No vocabulary drills. Follow one record from start to finish and watch rules and verification replace trust.
CHAPTER 01
A record
Lin sends bitcoin to Zhou. What moves is not a digital coin, but a signed record that changes ownership.
✓The record exists, but the network has not confirmed it yet.
- 01Unspent funds↓
- 02Sign locally↓
- 03A new record
Teaching flow: real nodes may temporarily see different messages or forks.
INTERACTIVE LAB
Don’t memorize it. Test it.
Three small experiments turn abstract ideas into observable results. Everything runs on your device.
Why is a changed record detectable?
Block 1Original hash
…Current hash…Matches original history
Block 2Original hash
…Current hash…Matches original history
Block 3Original hash
…Current hash…Matches original history
Editing data invalidates its original fingerprint. Recomputing it changes later references too. Real Bitcoin also uses proof of work to make rewriting history costly.
Teaching limits: one SHA-256 over teaching text, not Bitcoin’s full block format or double hashing. Difficulty and speed do not represent real mining.
Open standalone experimentWhat does mining actually try?
Nonce: — · Actual attempts: 0
—Not started. Change the text or difficulty and try it.
Finding a result takes attempts; checking it needs one hash. Outcomes depend on the input, not a scripted animation. Higher difficulty needs more attempts on average.
Teaching limits: one SHA-256 over teaching text, not Bitcoin’s full block format or double hashing. Difficulty and speed do not represent real mining.
Open standalone experimentWhere can a message still travel?
Reachable: 8 / 8 · An offline origin cannot send. Click numbered nodes to toggle them.
Propagation depends on paths, not a majority of online nodes. Nodes verify rules independently; receiving a message is not a confirmation.
Teaching limits: message propagation along paths, not confirmations, consensus, or real peer discovery.
Open standalone experimentLEARN WITH EVIDENCE
Trace every important claim to a source
We treat clarity and accuracy as equal requirements. Key explanations show their evidence, update date, and review status. Contested topics show boundaries instead of hype.
Primary sources
Start with the whitepaper, developer documentation, and BIPs — not second-hand opinion.
Plain language
Give the one-sentence answer first, then reveal terms, detail, and exceptions progressively.
Reproducible models
Make important concepts interactive so visitors can test cause and effect themselves.
COMMON QUESTIONS
What newcomers ask most
No. A blockchain is one mechanism Bitcoin uses to order and protect history. Bitcoin also includes nodes, proof of work, issuance rules, and incentives.
No single company or government can change the rules alone. Developers can propose code and miners produce blocks, but independently run nodes decide what rules to accept.
Mining primarily competes to add blocks and protect history. The reward includes newly issued bitcoin and fees, while new issuance falls on a preset schedule.
No. We explain how Bitcoin works. We do not offer trading advice, price forecasts, return calculators, portfolio tracking, or exchange referrals.
ABOUT BTCVISUAL
Understanding before judgment
BTCVisual aims to be the first stop for anyone curious about Bitcoin. You do not need to adopt a position or risk money. First understand how it works, then form your own view.
Start with chapter one↗