blockchain-in-node

This is an afternoon-project, a blockchain built in node, supporting PoW.

Why Node

Node itself is a more beautiful, flexible and powerful language for internet project, again, I want to show my love to js.

Why a Blockchain from scratch

When it comes to blockchain, most developers only learn how to do Dapp with ethereum, neo, or other existing infrastructure-completed project… They are fine, but using them will only let you know what you can do with them, as a result, you cannot really get the idea what you can do with blockchain itself, and what you can apply the blockchain mindset to other software projects. I think there is a better way to understand blockchain itself - to build a chain from scratch

This is a lovely demo for

A general Idea of how Blocks, Chain, Mining, Nodes, Transaction work with each others.
How to do them in Node
How to resolve basic conflicts in blockchain
How to use sha256 to do PoW(Proof of Work)
Not a demo for
- signatures
- address
- production setup
- making you a blockchain expert

Run it on your machine

$ npm clone https://github.com/amazingandyyy/blockchain-in-node.git
$ npm i
$ npm run dev // default on port 3000

<!-- to run more nodes -->
$ npm run nodes // default on port 3000
$ npm run nodes 3000 // listening on port 3000
$ npm run nodes 3001 // listening on port 3001
$ npm run nodes 3002 // listening on port 3002

HTTP Endpoints

GET /blockchain // see the link-list itself
POST /blockchain/mine // find the next special hash
POST /blockchain/body // add new data to the chain 

GET /blockchain/nodes // get a list of all nodes
GET /blockchain/nodes/resolve // fetch the longest chain
POST /blockchain/nodes/register // add nodes urls

There are many can be done:

Please feel free to fork, clone or send me PR

use socket instead of http, to broadcast state
implement signature, public key, private key, user address system
proof of work and rewarding system
new PoW algorithm
location based sharding?
hide IPs / make it private!?
PoS, or other dBFT methods
dockernized, easy to run a node
interactive wrappers, helper libraries(python, golang, java)…

Author

Andy Chen(amazingandyyy)

LICENSE

MIT