This project is a simple blockchain implementation written in Go. It includes functionality for creating blocks, adding transactions, implementing a Proof-of-Work (PoW) consensus mechanism, and interacting with the blockchain via a Command-Line Interface (CLI).

• Blockchain Structure:
  A chain of blocks linked together through cryptographic hashes.

• Transactions:
  Transactions are stored in each block, showcasing the core idea of a blockchain as a ledger.

• Proof of Work (PoW):
  A computational challenge that miners must solve to create a valid block.

• Block Details:
  Each block contains:

  • Index: The block's position in the chain.
  • Timestamp: When the block was created.
  • Transactions: Data stored in the block.
  • Nonce: A value adjusted to meet the PoW requirements.
  • Previous Hash: The hash of the previous block in the chain.
  • Current Hash: The hash representing the block's contents.

The cli.go file provides a command-line interface to interact with the blockchain.

Commands:

• Get Balance

  getbalance -address ADDRESS
  

Fetch the balance for the given address.

• Create Blockchain

  createblockchain -address ADDRESS
  

Initializes a new blockchain and rewards the address with the genesis block.

• Print Blockchain

  printchain
  

Prints all blocks in the blockchain.

• Send Coins

  send -from FROM -to TO -amount AMOUNT
  

Creates a transaction and mines a new block.

• Create Wallet

  createwallet
  

Generates a new wallet and address.

• List Addresses

  listaddresses
  

Lists all addresses stored in the wallet.

Prerequisites

• Go programming language installed (version 1.19 or later recommended).

Installation

1. Clone the repository:

   git clone https://github.com/ayushn2/blockchainx.git  
   cd blockchainx
   

2. Build the project:

   go build
   

• Start the CLI:

  go run main.go COMMAND [OPTIONS]
  

Replace COMMAND with one of the CLI commands mentioned above.

1. Create a Blockchain:

   go run main.go createblockchain -address your-address
   

2. Print the Blockchain:

   go run main.go printchain
   

3. Send Coins:

   go run main.go send -from sender-address -to receiver-address -amount 10
   

4. Get Balance:

   go run main.go getbalance -address your-address
   

5. Create a Wallet:

   go run main.go createwallet
   

6. List Addresses:

   go run main.go listaddresses  
   

• Implement a peer-to-peer network.
• Enhance transaction validation.
• Add a smart contract-like feature for custom logic.

Contributions are welcome! Feel free to submit issues or pull requests.