Build your own Blockchain in JS

This repository is reference for my eBook "Build your own blockchain in JS"

JS Blockchain code

Building a blockchain is a complex undertaking, so it's important to have a good understanding of the underlying principles and concepts. Here are some general steps you can follow to create a basic blockchain on

Define block structure: Each block in the blockchain should contain a set of transactions and metadata such as timestamps and unique identifiers (hashes). These properties allow you to define your block class.
Hashing implementation: To ensure blockchain integrity, each block's hash must be based on the block's contents, so any changes to the block will invalidate that hash. A cryptographic hash function such as SHA-256 can be used to generate the hash of each block.
Create Blockchain: You can create a blockchain as an array of block objects. The first block in the chain, called the genesis block, can be hard-coded as a starting point.
Append New Block: To add a new transaction to the blockchain, create a new block object and append it to the end of the blockchain. The hash of a new block should be based on the contents of previous blocks in the chain to ensure the integrity of the blockchain. Implement
Mining: To prevent spam transactions and ensure network security, you can implement proof-of-work algorithms that require miners to solve complex mathematical puzzles to add new blocks to the chain. This can be done by setting a difficulty level that miners must meet before their block is accepted.
Implement validation: To ensure the validity of the blockchain, you can implement a validation function that checks the integrity of each block's hash and the continuity of the chain.

Read complete guidance on creating blockchain in javascript. Only for educational purpose. The author Sankar Srinivasan is Certified Market Professional of National Stock Exchange of India.