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0x1EDF1cf760ebfb6E0b7BD410c2beBB591c7523dd
 

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Burn166280982023-02-14 16:11:23566 days ago1676391083IN
0x1EDF1cf7...91c7523dd
0 ETH0.0010054333.99040089
Burn166280982023-02-14 16:11:23566 days ago1676391083IN
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0 ETH0.0010692233.20690201
Burn166280912023-02-14 16:09:59566 days ago1676390999IN
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0 ETH0.0011014234.20690201
Burn166280612023-02-14 16:03:59566 days ago1676390639IN
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0 ETH0.0013422941.68743394
Burn166280532023-02-14 16:02:23566 days ago1676390543IN
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0 ETH0.0014280344.35044354
Burn166280412023-02-14 15:59:59566 days ago1676390399IN
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0 ETH0.0010428928.18714686
Burn166280282023-02-14 15:57:23566 days ago1676390243IN
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0 ETH0.0011030634.25788662
Burn166280002023-02-14 15:51:47566 days ago1676389907IN
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0 ETH0.0011590735.93020724
Burn166279622023-02-14 15:44:11566 days ago1676389451IN
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0 ETH0.0011940332.23024944
Transfer166226952023-02-13 22:03:35567 days ago1676325815IN
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0 ETH0.0007992720.22516306
Transfer166225692023-02-13 21:38:23567 days ago1676324303IN
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0 ETH0.0009022222.82334088
Transfer166225562023-02-13 21:35:47567 days ago1676324147IN
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0 ETH0.000975524.6769107
Transfer166222662023-02-13 20:37:47567 days ago1676320667IN
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0 ETH0.0009060922.92800813
Transfer166222582023-02-13 20:36:11567 days ago1676320571IN
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0 ETH0.0009086722.98638282
Transfer166210122023-02-13 16:24:47567 days ago1676305487IN
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0 ETH0.0011334332.64592772
Transfer166200182023-02-13 13:04:35567 days ago1676293475IN
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0 ETH0.0012733724.57349281
Transfer166200132023-02-13 13:03:35567 days ago1676293415IN
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0 ETH0.0013869924.49706108
Transfer166074582023-02-11 18:58:23569 days ago1676141903IN
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0 ETH0.0005752918.02360952
Transfer166074482023-02-11 18:56:23569 days ago1676141783IN
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0 ETH0.0006645916.81707324
Transfer166074092023-02-11 18:48:35569 days ago1676141315IN
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0 ETH0.0006975717.65161396
Transfer166073792023-02-11 18:42:35569 days ago1676140955IN
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0 ETH0.000682617.27295474
Transfer166073642023-02-11 18:39:35569 days ago1676140775IN
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0 ETH0.0006739617.04906605
Approve166073332023-02-11 18:33:23569 days ago1676140403IN
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0 ETH0.0006786818.60282146
Transfer166073282023-02-11 18:32:23569 days ago1676140343IN
0x1EDF1cf7...91c7523dd
0 ETH0.0007152918.09444934
Approve166072732023-02-11 18:21:11569 days ago1676139671IN
0x1EDF1cf7...91c7523dd
0 ETH0.0006724518.42586965
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Contract Source Code Verified (Exact Match)

Contract Name:
ERC20071122

Compiler Version
v0.8.17+commit.8df45f5f

Optimization Enabled:
No with 200 runs

Other Settings:
default evmVersion
File 1 of 6 : erc20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";

// It's an interface which for a standard ERC20 token
abstract contract StandardToken is ERC20 {}

// It's an interface which is a bridge between deprecated contract and a new one
abstract contract UpgradedToken is StandardToken {
    // those methods are called by the legacy contract
    // and they must ensure msg.sender to be the contract address
    function transferByLegacy(
        address from,
        address to,
        uint256 value
    ) public virtual returns (bool);

    function transferFromByLegacy(
        address sender,
        address from,
        address spender,
        uint256 value
    ) public virtual returns (bool);

    function approveByLegacy(
        address from,
        address spender,
        uint256 value
    ) public virtual returns (bool);

    function increaseAllowanceByLegacy(
        address spender, 
        uint256 addedValue
    ) public virtual returns (bool);

    function decreaseAllowanceByLegacy(
        address spender, 
        uint256 addedValue
    ) public virtual returns (bool);
}

// It's a main contract for the token
contract ERC20071122 is StandardToken, Ownable {
    uint256 private _totalSupplyInitial = 100000000000;

    address public upgradedAddress;
    bool public deprecated = false;

    mapping(address => bool) public blockedAccounts;

    event AddedBlocked(address _user);
    event RemovedBlocked(address _user);
    event Deprecate(address newAddress);

    constructor() ERC20("USDANT Stablecoin", "USDANT") {
        _mint(msg.sender, _totalSupplyInitial * (10**decimals()));
    }

    // Specifying token decimals explicitly
    function decimals() public view virtual override returns (uint8) {
        return 6;
    }

    // Overiding the transfer method to check if an account is blocked upon the transaction
    function transfer(address to, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        require(!blockedAccounts[msg.sender]);

        if (deprecated) {
            // Forward user ERC20 methods to upgraded contract if this one is deprecated
            return UpgradedToken(upgradedAddress).transferByLegacy(msg.sender, to, amount);
        } else {
            return super.transfer(to, amount);
        }
    }

    // Overiding the transferFrom method to check if an account is blocked upon the transaction
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) public virtual override returns (bool) {
        require(!blockedAccounts[from]);
        require(!blockedAccounts[msg.sender]);

        if (deprecated) {
            // Forward user ERC20 methods to upgraded contract if this one is deprecated
            return UpgradedToken(upgradedAddress).transferFromByLegacy(
                    msg.sender,
                    from,
                    to,
                    amount
                );
        } else {
            return super.transferFrom(from, to, amount);
        }
    }

    // Forward user ERC20 methods to upgraded contract if this one is deprecated
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        require(!blockedAccounts[spender]);
        require(!blockedAccounts[msg.sender]);
        
        if (deprecated) {
            // Forward user ERC20 methods to upgraded contract if this one is deprecated
            return UpgradedToken(upgradedAddress).approveByLegacy(msg.sender, spender, amount);
        } else {
            return super.approve(spender, amount);
        }
    }

    function increaseAllowance(address spender, uint256 addedValue) public override virtual returns (bool) {
        require(!blockedAccounts[spender]);
        require(!blockedAccounts[msg.sender]);
        
        if (deprecated) {
            // Forward user ERC20 methods to upgraded contract if this one is deprecated
            return UpgradedToken(upgradedAddress).increaseAllowanceByLegacy(spender, addedValue);
        } else {
            return super.approve(spender, addedValue);
        }
    }

    function decreaseAllowance(address spender, uint256 subtractedValue) public override virtual returns (bool) {
        require(!blockedAccounts[spender]);
        require(!blockedAccounts[msg.sender]);
        
        if (deprecated) {
            // Forward user ERC20 methods to upgraded contract if this one is deprecated
            return UpgradedToken(upgradedAddress).decreaseAllowanceByLegacy(spender, subtractedValue);
        } else {
            return super.approve(spender, subtractedValue);
        }
    }

    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        if (deprecated) {
            // Forward user ERC20 methods to upgraded contract if this one is deprecated
            return UpgradedToken(upgradedAddress).allowance(owner, spender);
        } else {
            return super.allowance(owner, spender);
        }
    }

    function totalSupply() public view virtual override returns (uint256) {
        if (deprecated) {
            // Forward user ERC20 methods to upgraded contract if this one is deprecated
            return UpgradedToken(upgradedAddress).totalSupply();
        } else {
            return super.totalSupply();
        }
    }

    function balanceOf(address account) public view virtual override returns (uint256) {
        if (deprecated) {
            // Forward user ERC20 methods to upgraded contract if this one is deprecated
            return UpgradedToken(upgradedAddress).balanceOf(account);
        } else {
            return super.balanceOf(account);
        }
    }

    // Issuing <amount> tokens on address <to>
    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }

    // Burning <amount> tokens on address <from>
    function burn(address from, uint256 amount) public onlyOwner {
        _burn(from, amount);
    }

    function getBlockStatus(address _maker) public view returns (bool) {
        return blockedAccounts[_maker];
    }

    // Adding an address to block
    function addBlock(address _address) public onlyOwner {
        blockedAccounts[_address] = true;
        emit AddedBlocked(_address);
    }

    // Removing an address from block
    function removeBlock(address _address) public onlyOwner {
        blockedAccounts[_address] = false;
        emit RemovedBlocked(_address);
    }

    // Deprecate current contract in favour of a new one
    function deprecate(address _upgradedAddress) public onlyOwner {
        deprecated = true;
        upgradedAddress = _upgradedAddress;
        emit Deprecate(_upgradedAddress);
    }
}

File 2 of 6 : Ownable.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

/**
 * @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
 * can later be changed with {transferOwnership}.
 *
 * 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 Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

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

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        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`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @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);
    }
}

File 3 of 6 : 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].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * 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}.
     *
     * 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 default value returned by this function, unless
     * it's 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 4 of 6 : 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 5 of 6 : 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 6 of 6 : 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

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"}],"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"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"upgradedAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","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.