Blockchain

Code targeted on blockchain implementation in JavaScript
Consensus: PoW/PoS with longest chain
Hash: SHA256
Nodes: Variable
Block Size: Variable (Default: 5)

Pre-requisites:

1. Nodejs (Used: v16.15.1)
2. NPM (Used: v8.11.0)
3. POSTMAN to interact with API (2022 June)
4. Required modules/libraries
   • Express (Used: v4.18.1)
   • Nodemon (Used: v1.19.4)
   • Body-parser (Used: v1.20.0)
   • Request-promise (Used: v4.2.6)(Deprecated)
   • SHA256 (Used: v0.2.0)
   • UUID (Used: v3.4.0)

Functions

1. (GET) View Existing Blockchain http://localhost:3001/blockchain
2. (POST) Create Transaction broadcast http://localhost:3001/transaction/broadcast
3. (POST) Create Multiple Transactions broadcast http://localhost:3001/multiple-txn
4. (POST) Register and Broadcast Nodes http://localhost:3001/register-and-broadcast-node
5. (GET) Mine blocks broadcast using PoW http://localhost:3001/mine
6. (POST) Mine blocks broadcast using PoS http://localhost:3001/mine-pos
7. (POST) Mine blocks in all LBCs using PoS http://localhost:3001/multi-mine
8. (GET) Invoke Consensus and Blockchain Sync http://localhost:3001/consensus
9. (GET) View Global blockchain http://localhost:3009/bridge

This repo contains all iterations for personal convenience. The latest release and step-by-step documentation to use the code and reproduce results is available here . Please keep in mind that this code is only for simulation of the hierarchical model and performance testing, hence does not implement several features that commercial blockchains do.

Note:

• Remember to set TRANSACTION_THRESHOLD in both files to alter block size.
  
• Change node count by opening the API on different ports. Check package.json to define additional nodes. Remember to declare these in the network during register-and-broadcast-node
• When running /mine-pos endpoint remember to input number of nodes. Mandatory for working of PoS.
• This code does not implement wallets (PKI/signing), ICO and validator lists.