◻️Writing Contracts (Solidity)

Since ZONA is fully EVM-compatible, you can write smart contracts using Solidity, the most widely used language for Ethereum and EVM-based blockchains.

If you’ve built on Ethereum, BNB Chain, or Avalanche, you can use the same syntax, tools, and patterns on ZONA without modification.

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🧱 Basic Solidity Contract Example

Here’s a simple example of an ERC-20 token written in Solidity that will work natively on ZONA:

/ SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract ZonaToken is ERC20 {
    constructor(uint256 initialSupply) ERC20("ZonaToken", "ZONA") {
        _mint(msg.sender, initialSupply);
    }
}

• You can deploy this using Hardhat, Remix, or Truffle

• The msg.sender will receive all minted tokens

• Gas fees will be paid in testnet ZONA (if on testnet)

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🧪 Use the Latest Solidity Version

ZONA supports Solidity versions up to ^0.8.x. For best performance and compatibility, always use the latest stable version.

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⚠️ Gas Optimization Tips

Even though ZONA offers lower gas fees than Ethereum, optimizing your contracts is still a best practice:

• Use uint256 instead of smaller types (less packing confusion)

• Minimize state writes inside loops

• Use external instead of public for functions that don’t need internal access

• Leverage events for off-chain indexing instead of storing too much data on-chain

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🛠 Tooling Compatibility

All major Solidity tools work out-of-the-box:

Tool	Supported
Hardhat	✅
Truffle	✅
Foundry	✅
Remix IDE	✅
MetaMask	✅

You can write and test your contracts locally, then deploy them directly to ZONA Testnet or Mainnet once live.

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📚 Learn More

• Solidity Docs

• OpenZeppelin Contracts

• Hardhat