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

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

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

• 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

$ 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

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

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)...

Andy Chen(amazingandyyy)

MIT