🔒 PoW-Blockchain

A simple Proof-of-Work (PoW) blockchain built from scratch in Go.

This project implements a basic PoW blockchain where nodes mine blocks and clients interact with the network. It’s a practical way to dive into blockchain fundamentals using Go.

This project is inspired by and based on the concepts from number571's blockchain tutorial.

1. Clone the repository:

git clone https://github.com/siyovush-hamidov/PoW-Blockchain
cd PoW-Blockchain

2. Build using the Makefile:

make build

This compiles node and client executables into the project directory.

./node -serve::8080 -newuser:node1.key -newchain:chain1.db -loadaddr:addrlist.json

This command runs a node on port 8080, creates a new user key (node1.key), and initializes a blockchain database (chain1.db).

./node -serve::9090 -newuser:node2.key -newchain:chain2.db -loadaddr:addrlist.json

This command runs another node on port 9090 with its own key and database.

./client -loaduser:node1.key -loadaddr:addrlist.json

This connects to the nodes using node1.key and interacts with the blockchain.

After running the client, use these commands:

• /user balance — Check your balance across nodes.
• /chain tx <receiver> <value> — Send a transaction (e.g., /chain tx aaa 3).
• /chain print — Display the blockchain.
• /chain balance — Check addresses' balance.
• /chain size — Get the number of blocks.
• /chain block <number> — View a specific block.
• /exit — Exit the client.