ExpressChain

ExpressChain is a simple NodeJS blockchain implementation that supports P2P node interaction via websockets. Also included is an HTTP serverfor interacting with the chain.

What can I do?

Create a blockchain, generate new blocks and add them to the chain
Run a local node that will listen for and broadcast new blocks
create new blocks via HTTP interaction - via ExpressJS

What can a node do?

Generate new blocks
Request the latest blocks(or the entire chain) from other nodes
Validate newly received blocks

Proof of Work

To prevent spamming the chain we need POW which adds an energy/time consuming element to block creation

Prior to adding a block to the chain, the node must generate a hash where the last x digits are '0's'
x = 3 is recommended

function proofOfWork(block){
		while(true){
			block.hash = generateHashh(block);
			if(block.hash.slice(-5) === "00000"){
				return block;
			}else{
				block.nonce++;
			}
		}
	}

Getting Started

Installation

To run ExpressChain

npm install
npm run

Check the terminal for the assigned port

To create a new block

localhost:3001/spawnClock/:testBlockName

To add a new node - mainly for testing purposes

localhost:3001/addNode/:port

btg5679 / expressChain