Naivechain - a blockchain implementation

A modified fork of lhartikk/naivechain. This project is still in developement.

Motivation

All the current implementations of blockchains are tightly coupled with the larger context and problems they (e.g. Bitcoin or Ethereum) are trying to solve. This makes understanding blockchains a necessarily harder task, than it must be. Especially source-code-wisely. This project is an attempt to provide as concise and simple implementation of a blockchain as possible.

What is blockchain

From Wikipedia : Blockchain is a distributed database that maintains a continuously-growing list of records called blocks secured from tampering and revision.

Key concepts of Naivechain

Check also this blog post for a more detailed overview of the key concepts

• HTTP interface to control the node
• Use Websockets to communicate with other nodes (P2P)
• Super simple "protocols" in P2P communication
• Data is not persisted in nodes
• No proof-of-work or proof-of-stake: a block can be added to the blockchain without competition

Quick start

(set up two connected nodes and mine 1 block)

npm install
HTTP_PORT=3001 P2P_PORT=6001 npm start
HTTP_PORT=3002 P2P_PORT=6002 PEERS=ws://localhost:6001 npm start
curl -H "Content-type:application/json" --data '{"data" : "Some data to the first block"}' http://localhost:3001/mineBlock

npm install
npm start

Get blockchain

curl http://localhost:3001/blocks

Mine a block

curl -X POST http://localhost:3001/mineBlock

Send transaction

curl -H "Content-type: application/json" --data '{"address": "04bfcab8722991ae774db48f934ca79cfb7dd991229153b9f732ba5334aafcd8e7266e47076996b55a14bf9913ee3145ce0cfc1372ada8ada74bd287450313534b", "amount" : 35}' http://localhost:3001/sendTransaction

Query transaction pool

curl http://localhost:3001/transactionPool

Mine transaction

curl -H "Content-type: application/json" --data '{"address": "04bfcab8722991ae774db48f934ca79cfb7dd991229153b9f732ba5334aafcd8e7266e47076996b55a14bf9913ee3145ce0cfc1372ada8ada74bd287450313534b", "amount" : 35}' http://localhost:3001/mineTransaction

Get balance

curl http://localhost:3001/balance

Query information about a specific address

curl http://localhost:3001/address/04f72a4541275aeb4344a8b049bfe2734b49fe25c08d56918f033507b96a61f9e3c330c4fcd46d0854a712dc878b9c280abe90c788c47497e06df78b25bf60ae64

Add peer

curl -H "Content-type:application/json" --data '{"peer" : "ws://localhost:6001"}' http://localhost:3001/addPeer

Query connected peers

curl http://localhost:3001/peers