make-a-blockchain

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make-a-blockchain

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Build a Blockchain from Scratch (NodeJS).

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# Build a Blockchain from scratch (NodeJS).

[![ko-fi](https://www.ko-fi.com/img/githubbutton_sm.svg)](https://ko-fi.com/P5P81OVFS)

### Learn
- 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.

- Adding the proof-of-work mechanism to our homemade Javascript blockchain. Proof-of-work will secure our blockchain against spammers and people trying to tamper with our blocks.

- :)

## Getting Started

* `git clone https://github.com/bliotti/make-a-blockchain`

* `cd make-a-blockchain`

* `yarn` or `npm install`

* Switch to branch *one*

* `git checkout one`

* Start in the *main.js* file and follow the instructions in the comments

##### There are 4 branches total

* `git checkout one`
* `git checkout two-Proof-of-Work`
* `git checkout three-transactions-minerewards`
* `git checkout four-signing`

### Final

* branches with *commented-final* or *final* are completed solutions.

SLIDES https://docs.google.com/presentation/d/15LVoFj7m2d0kZzJaGNSGMuDrRcT-jwOCv0srXMug2nk/edit?usp=sharing

make-a-blockchain

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