LongToken (LGT) ERC-20 TOKEN PROJECT

A fully functional ERC20 token smart contract deployed on the Ethereum testnet (Sepolia).This contract implements a capped, burnable ERC20 token with an automated miner reward system.

Deployed Contract Address: 0x4f8233Ddb735dDFA8B7122B2936f414B61e30eF2

Etherscan Link: https://sepolia.etherscan.io/token/0x4f8233Ddb735dDFA8B7122B2936f414B61e30eF2

🧠Technologies Used

Blockchain

• Ethereum (Sepolia Testnet)

Smart Contract Language

• Solidity

Development Tools

• Hardhat
• OpenZeppelin Contracts

✨ Features

• ERC20 Capped Supply
• Burnable Tokens (users can destroy their tokens)
• Automatic Miner Reward System (mints rewards to block miners on transfers)
• Owner-controlled block reward adjustment
• Fully tested and deployable with Hardhat

🧩 Getting Started with Testing

1️⃣ Clone the Repository

In your terminal, run:

git clone https://github.com/Bishopukpai/ERC-20-token.git

Then navigate into the cloned folder:

cd LongToken-smartcontract

Install dependencies:

npm install

🧠 Interact with the Smart Contract

You can interact with this smart contract in two ways:

Option A: Use the Already Deployed Contract

• Go to Remix IDE in your browser.

• In the File Explorer, click the Create New File icon.

• Name the file Longtoken.sol.

• Copy and paste the full contract code from this repository into that file.

• Go to the Solidity Compiler tab:

  • Select compiler version 0.8.20

  • Click Compile Longtoken.sol

• Go to the Deploy & Run Transactions tab:

  • Under Environment, select Injected Provider – MetaMask

  • Connect MetaMask to the Sepolia network

In the At Address field, paste:

 0x4f8233Ddb735dDFA8B7122B2936f414B61e30eF2

• Click At Address

Your deployed contract will appear under Deployed Contracts in Remix. Now you can start interacting with the functions.

Option B: Redeploy the Smart Contract

You can deploy your own instance of LongToken using Hardhat.

• Create a .env file in the root directory (same level as hardhat.config.js):

PRIVATE_KEY=your_sepolia_wallet_private_key
INFURA_PROJECT_ID=your_infura_project_id
ETHERSCAN_API_KEY=your_etherscan_api_key

⚠️ Important: Never commit your .env file to GitHub. Add it to .gitignore.

• Deploy the contract:

npx hardhat run scripts/deploy.js --network sepolia

After deployment, you’ll get a new contract address in your terminal. You can then follow Option A steps using your new address.

🧾 Example Interactions

1️⃣ Check Owner

• Click owner()

You’ll see the wallet address that deployed the contract.

2️⃣ Transfer Tokens

• Call transfer(address to, uint256 amount)

• MetaMask will ask for confirmation.

• After success, check balances using balanceOf(address).

3️⃣ Change Block Reward (Owner Only)

• Call setBlockReward(uint256 reward)

• Enter the reward amount (in whole tokens).

• MetaMask will confirm the transaction.

Smart Contract Developer: Ukpai Precious

Network: Ethereum (Sepolia)

Token Name: LongToken (LGT)