GoodChain

Welcome to GoodChain, a blockchain platform designed for both beginners and experienced users, seeking simplicity and flexibility. Built with TypeScript and LevelDB, GoodChain offers a customizable environment for experimenting with consensus algorithms, including a default Simple Proof-of-Work (PoW) option.

GoodChain is a distributed ledger that enables secure and irreversible transactions across a peer-to-peer distributed network of nodes, ensuring the integrity of data.

Key Features 🚀

• Pluggable Consensus: Experiment with your consensus algorithms or use the default PoW implementation
• RESTful API: Seamlessly integrate external systems with GoodChain's user-friendly API
• Wallet Management: Efficiently manage digital wallets, track balances, and handle transactions
• Node Discovery and Synchronization: Discover and sync with other nodes in the network to maintain a consistent state across the blockchain
• Transaction Pool: Manage pending transactions with our built-in transaction pool
• Chain Validation: Verify the integrity of the blockchain by validating blocks and transactions
• EKVS: Embeddable persistent key-value stores are databases that can be embedded into your application. This means no separate server or process is needed to manage the database. LevelDB is a popular example of an EKVS. GoodChain uses the Level library, a Node.js wrapper for LevelDB.

Getting Started 🛠️

To embark on your GoodChain adventure, simply clone the repository and install the dependencies:

# Clone the repository
git clone https://github.com/mlibre/GoodChain.git
cd GoodChain

# Install global dependencies
sudo npm install -g nodemon tsx typescript eslint vitest

# Install project dependencies
npm install

# Generate your miner keys for the first time
tsx src/test/generateKeys.ts

# Mine the very first block
tsx src/test/init.ts

# You may also run Node.js files directly
node dist/test/init.js

# Run the GoodChain node
npm run dev

REST API

Running REST API 🌐

Start the RESTful API server:

npm run dev
# OR
npm start -- --host "http://localhost:3000" --nodes "http://localhost:3001" --dbPath "./assets/db/" --minerKeysFile "./assets/keys/miner.json" --name "GoodChain"

Running Multiple REST Nodes 🌟

Run multiple nodes in the GoodChain network! Each node will have its own unique identity and contribute to the decentralized network. For example:

# Node 1
npm run 3000

# Node 2
npm run 3001

# Node 3
npm run 3002

Each node will have its own blockchain data, wallets, and nodes list, but they can communicate and synchronize with each other to maintain a consistent state.

RESTful API Endpoints 🛣️

GoodChain provides a rich set of HTTP API endpoints for your blockchain interactions. Explore, experiment, and have fun building amazing applications!

Endpoint	Method	Description
/block	GET	Retrieves information about a specific block or the latest block if no parameters are provided
/block	POST	Adds a new block to the blockchain
/block/broadcast	GET	Broadcasts the latest block to all nodes in the network
/chain	GET	Retrieves the entire blockchain
/chain/update	POST	Updates the local blockchain by fetching blocks from other nodes
/mine	GET	Mines a new block and adds it to the blockchain
/node	GET	Retrieves information about all nodes in the network
/node	POST	Adds a new node to the network
/node/update	POST	Updates the local node's knowledge of the network by fetching data from other nodes
/node/broadcast	GET	Introduces the local node to all other nodes in the network
/transaction	GET	Retrieves pending transactions
/transaction	POST	Adds a new transaction to the transaction pool
/transaction/update	GET	Updates the local transaction pool by fetching transactions from other nodes
/transaction/sign	POST	Signs a transaction with a private key
/wallet	GET	Retrieves information about wallets in the blockchain

Testing the Project 🧪

To ensure the reliability and correctness of the GoodChain project, you can run tests.

Running All Tests

Run the entire test suite using vitest:

npm run test
# OR
vitest run

Running Tests with the UI

For an interactive testing experience, use the vitest UI:

npm run test-ui
# OR
vitest --ui

Running Specific Tests

To run a specific test file, for example, the blockchain tests:

npm run test src/test/blockchain.test.ts

Support and Resources 🤝

Check out the Bruno collection in the assets folder for a quick start with API requests. For further assistance, consider reaching out through our GitHub Issues page.

License 📜

This project is licensed under the GNU General Public License.

Version History

Version 1

The first version of GoodChain was a simple blockchain implementation used to learn about blockchain technology. It used json files to store the blockchain data. Check out the releases to see the code.

Version 2

The second version of GoodChain was built using Node.js and Express.js, and used git to store the blockchain data. Check out the releases to see the code.

Version 3 (latest version)

The third version of GoodChain is built using TypeScript, Express.js, and LevelDB.

Donate 💖

If you find GoodChain helpful and would like to support its development, you can donate ETH to the following address:

0xc9b64496986E7b6D4A68fDF69eF132A35e91838e