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
socketinstead 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)
