🌌 GrayVault & GrayToken

Welcome to GrayChain — a simple yet secure smart contract system built on Solidity.
This project contains two core components:

1. GrayToken (GRE) – A custom ERC20 token with mint and burn functionality.
2. GrayVault – A secure vault that lets users deposit and withdraw GRE tokens safely.

This project is designed for learning, experimenting, and showcasing Solidity development with a strong emphasis on security practices (using OpenZeppelin, Pausable, ReentrancyGuard, and SafeERC20).

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✨ Features

• ✅ GrayToken (GRE)

  • Standard ERC20 token
  • Minting and burning by the contract owner
  • Useful for testing vault interactions

• ✅ GrayVault

  • Deposit GRE tokens into the vault
  • Withdraw tokens at any time
  • Emergency withdraw (only possible if the vault is paused)
  • Contract owner can pause/unpause
  • Protected against reentrancy
  • Events emitted for every critical action

• ✅ Testing

  • Full unit tests and fuzz tests written in Foundry
  • Includes invariants to ensure vault safety
  • Covers edge cases like zero deposits, over-withdraws, and paused state

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🛠️ Installation & Setup

Make sure you have Foundry installed.

Clone the repository:

git clone https://github.com/YOUR_USERNAME/GrayVault.git
cd GrayVault
forge build
forge test# GrayChain