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Contract

0x62F0Dc595a43ef9e3328ac8128f744fcef7059BB
 

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Approve202024432024-06-30 5:34:4713 days ago1719725687IN
0x62F0Dc59...cef7059BB
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Approve196286442024-04-10 23:54:5994 days ago1712793299IN
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Approve189034902023-12-31 5:50:35195 days ago1704001835IN
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Approve185882632023-11-17 1:16:35239 days ago1700183795IN
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Transfer179805742023-08-23 23:04:47325 days ago1692831887IN
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Approve178552182023-08-06 10:07:47342 days ago1691316467IN
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Transfer178174502023-08-01 3:24:47347 days ago1690860287IN
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Approve176674562023-07-11 2:38:23368 days ago1689043103IN
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Transfer173658192023-05-29 16:26:23411 days ago1685377583IN
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Transfer173658172023-05-29 16:25:59411 days ago1685377559IN
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Approve172831302023-05-18 1:18:59422 days ago1684372739IN
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Approve172696952023-05-16 3:44:59424 days ago1684208699IN
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Approve172684362023-05-15 23:29:35425 days ago1684193375IN
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Approve172295102023-05-10 10:48:23430 days ago1683715703IN
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Approve172234602023-05-09 14:23:11431 days ago1683642191IN
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Approve172163572023-05-08 14:26:23432 days ago1683555983IN
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Approve172155642023-05-08 11:45:35432 days ago1683546335IN
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Approve172131022023-05-08 3:28:47432 days ago1683516527IN
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Approve172113182023-05-07 21:27:11433 days ago1683494831IN
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Approve172112922023-05-07 21:21:59433 days ago1683494519IN
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Approve172100512023-05-07 17:09:23433 days ago1683479363IN
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0 ETH0.00755921160.15276645
Approve172098302023-05-07 16:24:11433 days ago1683476651IN
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0 ETH0.00592972125.62976135
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Contract Source Code Verified (Exact Match)

Contract Name:
CCP

Compiler Version
v0.8.18+commit.87f61d96

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 5 : ccp.sol
// SPDX-License-Identifier: MIT

                                                                                                                                                      
    //             +#*          *#.                                                                                                                      
    //            ++-=*        *=-*.                                                                                                                     
    //           :#=--*:.=**##**-==#                                                                                                                     
    //           :%+==+##+=--:--=++#                                                                                                                     
    //           :%*+-+=---:::---=*#                                                                                                                     
    //            *#*+=------:-----=#=                                                                                                                   
    //             ##+-------*#=====*%=                                                                                                                  
    //              *+-==---++==+++=+##                                                                                                        .         
    //     :@@@@@@@@*+======+=+++++=+=%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@=+         
    //     @@@@@@@@@*+++====+==++====+%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@:-        
    //    .@@@@@@@@@++++====+=%==--=#*@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%@@@==        
    //    -@@@@@@@@@++++======*=-:-%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@##        
    //    -@@@@@@%%@+++===-----=-=+*@#*%%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@##.       
    //    %@@@@@@@-#+=+===---====+****=+%@@@%%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%-:       
    //    @@@@%%#.-#++========+=+******=%@%@@@@@@@@@@@@%%%@@@%@@@%@@@@%%@@@@%@@@@%@@@@@%@@@@@%@%%@@@@@@@@@%@@%%%%@@@@@@@@@%@%@%@@%@@@%@@@@@@@@@@.=       
    //    @@@@@#::-#*========+++******++%@@@@@@@@@@@@@%@@@%%@@%%@%@@@@%%@@%@%%%%%@@@@@@@%%@%%@%@@@@@@@@@%@@@%@@@@@@%%@@@@@@%%%@%%%@@@@@@@@%%@@@@.+       
    //    @%@@:::.:-#+++=====+***%%%**++@@@@@@@@@@@@@@%%%%@@%%%@@@@@%%%%%%%%@@%%%@@%%@@%%%@%%@@%%%%@@@@%@%%%%%%%@@@%@%%%%%%%%%%%@%@@@@@@@%@@@@@@.+       
    //    @@=:-:...-@*+=+==++=*#%#%%#++%%@@@@@@@@@@%@@.  .@-   #@@@%:   -@@%%%%%%%%%@@% @@%%%@@@  +@@@%@@.  *@@@%%%%%%@%@@@@: @%@ %@@#-%@%@@@@@@.+       
    //    @+:-.....#%%*+=+++++***#**++#%@@@%@@@@@@@@@@-@@ @ *@.#@%@% %@:.@%++#@@@++%%%++@%%#++%%@:=%@@%@-:@= @++++%%@*+*%%@++ @@++@@#= +*%%@@@@@.+       
    //   *@:-:....:%@@%*+++++++**++=+*%%@@%@@@@@%##%%%@%: @ *@.#%@%@.  %@@- . %@: ..%*. @@# . *@@:=@@%@%-=@%.@:  . @  . .@=   @%. @%+. .=@@@@@@%@=.      
    //   *@%:-.....*#@@%#****+++++++*%@:@@@@@@%@.   .@%. @%.*@.#@@%@%%- :% %@:-% @%%@%% @%.=@.*@%:=@@%@%-=@@%@% @%.@  :..@ %# @%@ @%%# @@@@@@@@%@*:      
    //   *@@#:-....-@%%%%%%#**++++++*%#**@@%@@@@@@@@@@:.@@@ *%.#@@@% -@*.@ [email protected]% *#-#@% @@.+@.*@%:=%@@@%-.%= @% @%@@ .@#=@ == @@@ @%%# @-%@%@@%@@*:      
    //   *@@@--:....=@%%%%%%%##*+++*%#%: @%@@@@@@@@@@@    @=   %%%%@:   =@*  :@@+  -@*   %=    @   :@@%%%:  #@.  %%@=  .=@*   :%   #%%  .@%@@@@@@*:      
    //   *@@@@.-...:@%%%%%%%##%%%##%#%:..:%@@@@@@@@@@@@@@@@%@@@@%%@@%@@@@@%@@@@%%@@@%@@@@@@@@@@@%@@@@%%@@%@@@@%@@@%%%%@@%%%@@@@@@@@@@%%@@@%@@@@@@*:      
    //   *@@@@#--.#%%%%%%%%%%%###%%#%%....%%@@@@@@@@@@@@@@@@@%%%%%%%%%%@@@@@@@@@@@@@@@@%@@@@%@@@@@@@@@@@@@@@@@@@@@%%%@@@@@@@%%%%%%@@@@@%%%@@@@@@@*:      
    //   *@@@%@.-#%##%%%%%%%%%%%%##%%%+....#%@@@@@@@@@@@@@@@@%%%%%%%%%%@@@%%%%%@@@@@@@@@@%@@%%@@@@@@%@@@@@@@@@@@@@%%%%%%@%%%%%%%%%%%%%%%%%@@@@@@@*:      
    //   *@@@%@@:%%###%%%%%%%%%%%%%%%%%....=@@@%@@@@@@@@@@@@@%%%%%%%%%%@@@@@@@%@@@@%%@@@%@@@@@@@@@@@@@@@@@%@@@@@@%%@@%%%@@@%%%%%%%%%%%%@@%%@@@@@@*:      
    //   *@@%@%%+#%###%%%%%%%###%%%%##%-....-@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%%@@@@@@%%%%@@%@%%@@@@@@@@@@%%@%%@@@@@@%%@%%@%%%@%%%@%%%%%%%@@%%%%@@@@@*:      
    //   *@@%@@@@*####%%%%%%##########%%.....@%@@@@@@@@@@@@@@@@@@@@@@@@@@@+-@%@@@@%%=-@@%@:+@%@@@@@%@= .@%@@@@@@@#.+@@@@%%@%@%@@%%@@@@%@%%%@@@@@@*:      
    //   *@@@@@@%%=%%%@%%%%############%#.....@%%%@@@@@@@@@@@@@@@@@@%@@@@@=:@@%%@@@@-:@%%%.+%%@@@@@@%   #%%@@@@@@= -      =%%%*         -@@@@@@@@*:      
    //   *@@@@@@@%@+%%%%%%%#############%#....%%@%@@@@%#          %@@@@@@@=:@@@@@@**::**@%.+%@%%@@@%..@: #%@@@@%% **########%%* @@% @@@=-@@@@@@@@*:      
    //   *@@@@@@%@%=%%%%%%##############%:...:@%@%%@%%%%%%%%%%%%%%@%@%@@%%=:@@@%@@.... .@%.+%@%@@@=..@@%- #%@%@%+ .........:%@* @@# @%%--%@@@@@@@*:      
    //   *@@@@@@@@@@-%%%%%####%%#*+++**%%*..#@@%%%%@%%%@%%%%%@@@%%%%@%%%@@=-@%%@%%%@@*.@@%.+%%@@%:  :::::  .:@%@ .@+::::::=@@%* ::: :::.-%@@@@@@@*:      
    //   *@@@@@%@@%%#=%%%%#%%#+=---:--=*%#.%%%%%@@@@@%%%%%%%%@@%%%@%@.           =@@* +-      *%  #+++++++%.-@=. .@#++++++#%@%* +++ +++:-@@@@@@@@*:      
    //   *@@@@@@@@%@@:%%%%%*=-::::::::--*=@%%%@@     @%%%@@%%%%%@@%%%@@@@@+:@@@@@@%%-:@%@@.+@@@%@@@@@%%%%%@@@%- *.@=      -@@%* @@% @@@--@@@@@%@@*:      
    //   .@@@@@@@@%%%@-%#+=--:::::::::-:=@@@%%%%%%%@%@%%%%%%%%%%%@%%%@@@@@=:@%@%@%%:  .*%%.+%%%%%...........+%@%*.%%%%%%%%%%%@* %%# %%%--@@@@@@@:#:      
    //    @@@@@@@@%@%@#===--:::::::::::%@@@@%@%@@%%%%%@@@@@@@@@@@@%%%%@%@@=-@@@@@@: -:* @@.+@@%%%###.=#* ###@%@%+.%=      =@@%*         -@@@@@@@.+       
    //    @@@@@@@@@@@@%+==--:::::::::+@@@%%%@@@@@@@%%%@%@@@@@@@@@@@@@@@@@@=:@@@%%@+@--%+@%.+%%%%%@%# %%%.:%@%@@@+.@=:@@@@.=@%%- @@% @@@=-@@@@@@@.+       
    //    @@@@@@@@%@@%%%:=---::::::.*%@@%%%%@@@%%@@%%%*            +%@@@%%=:@@@@@@@@-:@%@@.+@@%%%@@  #### .@@@%@+.@=:####:=@@@ %@@# @%%--%@@@@@@.+       
    //    @@@@@@@@@@@@@@#----::::-:%@@%@@@@@@@@@@@@@@@%@@@@@@@@@@@@@%@@@@%=:@@@@@@@%--%.    ...@%..        .@@@@+.@=      =@%= %@@# @%%--@@@@@@@.+       
    //    @%@@@@@@@@@@@@@*:--:::.=@%@%@@@@@@@@@@@@@@@@%@@@@@@%%%%%@@%@@@@@=-@@%@@@@%--%********@@****@@@@@# @@@@%#@##@@@@*%@% -@@%# =   #@@@@@@@.+       
    //   .:@@@@@@@@@@@@@@@----::%@%@@@@@@@@@@@@@@@@@@@@@@@@%%%%@@@@@%@@@@@@@@@@@@@@@@@@%@%%%%@@%@@@%%@@@@%@@@@@@@%@@%%@@@@@@@@@%@@@@@@@@@@@@@@%#%-       
    //    -@%@@@@@@@@@@@@@@.-::@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%##.       
    //    -@@@@@@@@@@@@@@@@*.*@@@@@%%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%@@@@@@@@@@@@@@@@@@@@@@%@@@@@@@@@@@@@@@@@@%@@@@@@@@@@@@@%%@@@@@@@%*#.       
    //    .@%@@@@@@@@@@@@@@@@@@@@%%%@@@%%%%@@@@@@@@@@@@@@@@@@%%%%%%%%@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@%%%@@@@@@@@@@@@@@@@@@@@@@@@@@@@%%@@@@@@:*        
    //     *@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@#+-        
    //     .:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::#.  
//
//Telegram: https://t.me/ccpcoinportal
//Ni Hao Wealthy Chinamen

pragma solidity 0.8.18;

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

contract CCP is ERC20 {
    constructor() ERC20("Chinese Cash Panda", "CCP") {
        uint256 supply = 888_888_888_888;
        _mint(msg.sender, supply * 10**18);
    }
}

File 2 of 5 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * The default value of {decimals} is 18. To select a different value for
     * {decimals} you should overload it.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the value {ERC20} uses, unless this function is
     * overridden;
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        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);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(
        address owner,
        address spender,
        uint256 amount
    ) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 amount
    ) internal virtual {}
}

File 3 of 5 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @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 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;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 4 of 5 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 5 of 5 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

Settings
{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.