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…


  1. What I don't understand about blockchain is that everyone will get the blocks that is created, so in the end everyone's pc will run out of space as you get the blocks from everyone in the world, how his this handled to ensure that we don't drown in data?

  2. This is horrifying, I changed into the directory the js file was stored in command prompt, then I did node name.js. When it ran it said "Cannot find module crypto-js/sha256". I only have 2 weeks to run this code so can you please help me resolve this ASAP.

  3. Amazingly explained! I really didn't know anything about Blockchain. After watching this video, I was like "wow, this guy is amazing!". You did it so nice Savjee! Thanks a lot!

  4. Also, if they're never deleted, wouldn't this cause an enormous strain on the server capacity through accumulation? All information is copied, distributed to an entire network (copied each time) and never deleted? Sounds like room for disaster.

  5. Amazing explanation. One thing I fail to understand is the hash system. Is that a simply a random crypto code? What keeps one from simply copying the hash and validating it that way? I mean, you recalculated the hash, but the sha256 now has different data to stringify so I suppose the hash inevitably will become different, but what prevents you from copying the hash?

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