February 21, 2026

Capitalizations Index – B ∞/21M

Creating a blockchain with Javascript (Blockchain, part 1)

Creating a blockchain with javascript (blockchain, part 1)

Creating a blockchain with Javascript (Blockchain, part 1)

Creating a blockchain with javascript (blockchain, part 1)Learn how to write your own Blockchain with JavaScript. In this video I’ll show you what is behind a blockchain by using simple code. It’s not a complete implementation, but enough to understand how blockchains work and how they guarantee that blocks can never be changed.

After creating our blockchain we’ll try and tamper with it. This will demonstrate a blockchains ability to detect fraud.

Next video (implementing proof-of-work):

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► Source code
Available on GitHub:
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