Blockchain Demo shows how a chain of hashes works
- Regulatory status
- Not a financial service
- Custody
- Not applicable
- Open source
- Yes
- Status
- Active
Swiss angle
Blockchain Demo is a global teaching tool with no Swiss base. The repository on GitHub, read on 4 October 2026, belongs to Anders Brownworth and is released under the MIT licence; the demo itself runs on his personal site. It is a set of web pages that hold no money and serve no customers, so it is not a financial service.
No fetched page names a Swiss version, price or language. The lesson, how a chain of hashes makes old records hard to change, is the same everywhere. The chapter on how Bitcoin works without the jargon explains the same idea in words; the demo lets you try it.
Who it is for
Beginners who learn by clicking. The README calls it a very basic visual introduction to the concepts behind a blockchain that introduces the idea of an immutable ledger through an interactive web demo. Start on the SHA256 Hash page: type anything into the data box and watch the hash change completely with each letter.
People who want to see why mining takes work. The Block page has fields for the block number, a nonce, the data and the hash, plus a Mine button that searches for a nonce that makes the hash valid. The README explains that each extra required zero makes the puzzle 16 times harder, because a hex character has 16 possible values.
Readers who want to see coins appear. The Coinbase Transactions page shows three copies of the chain, labelled Peer A, Peer B and Peer C, with a coinbase line in each block that creates new coins and transactions that spend them. Change one peer's copy and you can see it no longer matches the other two.
Teachers and meetup hosts. The README says you can run the demo on your own computer with npm start or docker-compose up -d, so it works in a room without reliable internet.
Who it is not for
People who want to learn how to buy, store or send real bitcoin. The demo runs on toy data and never touches the Bitcoin network. The chapter on wallets and staying secure covers the practical side.
Readers who want the full technical picture. The demo shows hashing and the chain idea, not addresses, scripts or fees. For that, read Mastering Bitcoin, free on GitHub.
Anyone who wants to look up a real transaction. Use mempool.space for that; it shows live Bitcoin data.
Verified facts
| Source | Checked on |
|---|---|
| Blockchain Demo on GitHub | |
| Blockchain Demo |
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