0x88c426b1e311eF9A47e56c568117eb5FeD6E0E4c

#Refresh Page #Block #77955323 #Participants #Token Https://www. (󠀤) #Verified By #Hash: #0xc448469ee334f4b4440eb4af6f877d72c517e24777458d4824562f1c36f07b06 #Parent Hash #Sha3Uncles: #0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347 #Holders #Information #Contract #Analytics #Cards #Code #Read Contract #Write Contract

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

/**

• @dev Interface of the ERC20 standard as defined in the EIP. / interface IERC20 { /*

  • @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 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 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); }

/*

• @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) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } }

/**

• @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.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How

• to implement supply mechanisms].

• We have followed general OpenZeppelin guidelines: functions revert instead

• of 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 defaut 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:
  • • recipient cannot be the zero address.
  • • the caller must have a balance of at least amount. */ function transfer(address recipient, uint256 amount) public virtual override returns (bool) { _transfer(_msgSender(), recipient, 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}.
  • Requirements:
  • • spender cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { _approve(_msgSender(), 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}.

  • Requirements:

  • • sender and recipient cannot be the zero address.
  • • sender must have a balance of at least amount.
  • • the caller must have allowance for sender's tokens of at least

  • amount. */ function transferFrom( address sender, address recipient, uint256 amount ) public virtual override returns (bool) { _transfer(sender, recipient, amount);

    uint256 currentAllowance = _allowances[sender][_msgSender()]; require(currentAllowance >= amount, "ERC20: transfer amount exceeds allowance"); _approve(sender, _msgSender(), currentAllowance - 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) { _approve(_msgSender(), spender, _allowances[_msgSender()][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) { uint256 currentAllowance = _allowances[_msgSender()][spender]; require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); _approve(_msgSender(), spender, currentAllowance - subtractedValue);

    return true; }

  /**

  • @dev Moves tokens amount from sender to recipient.

  • This is 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:

  • • sender cannot be the zero address.
  • • recipient cannot be the zero address.
  • • sender must have a balance of at least amount. */ function _transfer( address sender, address recipient, uint256 amount ) internal virtual { require(sender != address(0), "ERC20: transfer from the zero address"); require(recipient != address(0), "ERC20: transfer to the zero address");

    _beforeTokenTransfer(sender, recipient, amount);

    uint256 senderBalance = _balances[sender]; require(senderBalance >= amount, "ERC20: transfer amount exceeds balance"); _balances[sender] = senderBalance - amount; _balances[recipient] += amount;

    emit Transfer(sender, recipient, 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:

  • • to 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; _balances[account] += amount; emit Transfer(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"); _balances[account] = accountBalance - amount; _totalSupply -= amount;

    emit Transfer(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 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 to 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 {} }

/**

• @title HelloERC20
• @author Veshi
• @dev Implementation of the HelloERC20 */ contract HelloERC20 is ERC20 { constructor(string memory name_, string memory symbol_) payable ERC20(name_, symbol_) { _mint(_msgSender(), 10000e18); } }

#Contract ABI [{"inputs":[{"internalType":"string","name":"name_","type":"string"},{"internalType":"string","name":"symbol_","type":"string"}],"stateMutability":"payable","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":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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