Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract PixelPainting {
    address public constant FEE_RECIPIENT = 0x5255eF6956a77143D3F18978555c6cdCd4F2aA0A;
    uint256 public constant FIXED_FEE_PER_PIXEL = 30000000000000; // 0.00003 ETH per pixel
    
    event PixelsPainted(
        address indexed user,
        bytes32 pixelsHash,
        uint256 timestamp,
        bytes32 transactionId
    );

    function paintPixels(bytes32 pixelsHash, uint256 numPixels) external payable {
        // If sender is fee recipient, no payment required
        if (msg.sender != FEE_RECIPIENT) {
            require(msg.value == FIXED_FEE_PER_PIXEL * numPixels, "Must send exactly 0.00003 ETH per pixel");
        }
        
        bytes32 transactionId = keccak256(
            abi.encodePacked(
                msg.sender,
                pixelsHash,
                block.timestamp,
                block.number
            )
        );

        emit PixelsPainted(
            msg.sender,
            pixelsHash,
            block.timestamp,
            transactionId
        );
    }

    function withdrawFees() external {
        require(msg.sender == FEE_RECIPIENT, "Only fee recipient can withdraw");
        uint256 balance = address(this).balance;
        require(balance > 0, "No fees to withdraw");
        
        (bool success, ) = payable(FEE_RECIPIENT).call{value: balance}("");
        require(success, "Withdrawal failed");
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": true,
    "mode": "3"
  },
  "outputSelection": {
    "*": {
      "*": [
        "abi",
        "metadata"
      ],
      "": [
        "ast"
      ]
    }
  },
  "detectMissingLibraries": false,
  "forceEVMLA": false,
  "enableEraVMExtensions": false,
  "libraries": {}
}

[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"bytes32","name":"pixelsHash","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"transactionId","type":"bytes32"}],"name":"PixelsPainted","type":"event"},{"inputs":[],"name":"FEE_RECIPIENT","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"FIXED_FEE_PER_PIXEL","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"pixelsHash","type":"bytes32"},{"internalType":"uint256","name":"numPixels","type":"uint256"}],"name":"paintPixels","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"withdrawFees","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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