Feature Tip: Add private address tag to any address under My Name Tag !
ERC-20
DAO
Overview
Max Total Supply
5,066,668,921.357176056911546642 PEOPLE
Holders
18,432 ( 0.011%)
Market
Price
$0.07 @ 0.000018 ETH (+1.50%)
Onchain Market Cap
$362,859,628.14
Circulating Supply Market Cap
$362,860,874.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
0 PEOPLEValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
Tickets
Compiler Version
v0.8.6+commit.11564f7e
Optimization Enabled:
Yes with 10000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.6; import "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import "@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20Permit.sol"; import "@paulrberg/contracts/token/erc20/Erc20Permit.sol"; import "./interfaces/ITickets.sol"; import "@openzeppelin/contracts/access/Ownable.sol"; contract Tickets is ERC20, ERC20Permit, Ownable, ITickets { constructor(string memory _name, string memory _symbol) ERC20(_name, _symbol) ERC20Permit(_name) {} function print(address _account, uint256 _amount) external override onlyOwner { return _mint(_account, _amount); } function redeem(address _account, uint256 _amount) external override onlyOwner { return _burn(_account, _amount); } }
// SPDX-License-Identifier: MIT 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.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 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: * * - `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"); unchecked { _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"); unchecked { _approve(_msgSender(), spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `sender` to `recipient`. * * 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: * * - `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"); unchecked { _balances[sender] = senderBalance - amount; } _balances[recipient] += amount; emit Transfer(sender, recipient, amount); _afterTokenTransfer(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: * * - `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; _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; } _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 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 {} }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./draft-IERC20Permit.sol"; import "../ERC20.sol"; import "../../../utils/cryptography/draft-EIP712.sol"; import "../../../utils/cryptography/ECDSA.sol"; import "../../../utils/Counters.sol"; /** * @dev Implementation of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on `{IERC20-approve}`, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. * * _Available since v3.4._ */ abstract contract ERC20Permit is ERC20, IERC20Permit, EIP712 { using Counters for Counters.Counter; mapping(address => Counters.Counter) private _nonces; // solhint-disable-next-line var-name-mixedcase bytes32 private immutable _PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)"); /** * @dev Initializes the {EIP712} domain separator using the `name` parameter, and setting `version` to `"1"`. * * It's a good idea to use the same `name` that is defined as the ERC20 token name. */ constructor(string memory name) EIP712(name, "1") {} /** * @dev See {IERC20Permit-permit}. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) public virtual override { require(block.timestamp <= deadline, "ERC20Permit: expired deadline"); bytes32 structHash = keccak256(abi.encode(_PERMIT_TYPEHASH, owner, spender, value, _useNonce(owner), deadline)); bytes32 hash = _hashTypedDataV4(structHash); address signer = ECDSA.recover(hash, v, r, s); require(signer == owner, "ERC20Permit: invalid signature"); _approve(owner, spender, value); } /** * @dev See {IERC20Permit-nonces}. */ function nonces(address owner) public view virtual override returns (uint256) { return _nonces[owner].current(); } /** * @dev See {IERC20Permit-DOMAIN_SEPARATOR}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view override returns (bytes32) { return _domainSeparatorV4(); } /** * @dev "Consume a nonce": return the current value and increment. * * _Available since v4.1._ */ function _useNonce(address owner) internal virtual returns (uint256 current) { Counters.Counter storage nonce = _nonces[owner]; current = nonce.current(); nonce.increment(); } }
// SPDX-License-Identifier: WTFPL // solhint-disable var-name-mixedcase pragma solidity >=0.8.4; import "./Erc20.sol"; import "./IErc20Permit.sol"; /// @notice Emitted when the recovered owner does not match the actual owner. error Erc20Permit__InvalidSignature(uint8 v, bytes32 r, bytes32 s); /// @notice Emitted when the owner is the zero address. error Erc20Permit__OwnerZeroAddress(); /// @notice Emitted when the permit expired. error Erc20Permit__PermitExpired(uint256 deadline); /// @notice Emitted when the recovered owner is the zero address. error Erc20Permit__RecoveredOwnerZeroAddress(); /// @notice Emitted when the spender is the zero address. error Erc20Permit__SpenderZeroAddress(); /// @title Erc20Permit /// @author Paul Razvan Berg contract Erc20Permit is IErc20Permit, // one dependency Erc20 // one dependency { /// PUBLIC STORAGE /// /// @inheritdoc IErc20Permit bytes32 public immutable override DOMAIN_SEPARATOR; /// @inheritdoc IErc20Permit bytes32 public constant override PERMIT_TYPEHASH = 0xfc77c2b9d30fe91687fd39abb7d16fcdfe1472d065740051ab8b13e4bf4a617f; /// @inheritdoc IErc20Permit mapping(address => uint256) public override nonces; /// @inheritdoc IErc20Permit string public constant override version = "1"; /// CONSTRUCTOR /// constructor( string memory _name, string memory _symbol, uint8 _decimals ) Erc20(_name, _symbol, _decimals) { uint256 chainId; // solhint-disable-next-line no-inline-assembly assembly { chainId := chainid() } DOMAIN_SEPARATOR = keccak256( abi.encode( keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"), keccak256(bytes(name)), keccak256(bytes(version)), chainId, address(this) ) ); } /// PUBLIC NON-CONSTANT FUNCTIONS /// /// @inheritdoc IErc20Permit function permit( address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external override { if (owner == address(0)) { revert Erc20Permit__OwnerZeroAddress(); } if (spender == address(0)) { revert Erc20Permit__SpenderZeroAddress(); } if (deadline < block.timestamp) { revert Erc20Permit__PermitExpired(deadline); } // It's safe to use the "+" operator here because the nonce cannot realistically overflow, ever. bytes32 hashStruct = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, amount, nonces[owner]++, deadline)); bytes32 digest = keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, hashStruct)); address recoveredOwner = ecrecover(digest, v, r, s); if (recoveredOwner == address(0)) { revert Erc20Permit__RecoveredOwnerZeroAddress(); } if (recoveredOwner != owner) { revert Erc20Permit__InvalidSignature(v, r, s); } approveInternal(owner, spender, amount); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.6; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; interface ITickets is IERC20 { function print(address _account, uint256 _amount) external; function redeem(address _account, uint256 _amount) external; }
// SPDX-License-Identifier: MIT 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() { _setOwner(_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 { _setOwner(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"); _setOwner(newOwner); } function _setOwner(address newOwner) private { address oldOwner = _owner; _owner = newOwner; emit OwnershipTransferred(oldOwner, newOwner); } }
// 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); }
// SPDX-License-Identifier: MIT 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); }
// SPDX-License-Identifier: MIT 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; } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612]. * * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't * need to send a transaction, and thus is not required to hold Ether at all. */ interface IERC20Permit { /** * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens, * given ``owner``'s signed approval. * * IMPORTANT: The same issues {IERC20-approve} has related to transaction * ordering also apply here. * * Emits an {Approval} event. * * Requirements: * * - `spender` cannot be the zero address. * - `deadline` must be a timestamp in the future. * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` * over the EIP712-formatted function arguments. * - the signature must use ``owner``'s current nonce (see {nonces}). * * For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP * section]. */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /** * @dev Returns the current nonce for `owner`. This value must be * included whenever a signature is generated for {permit}. * * Every successful call to {permit} increases ``owner``'s nonce by one. This * prevents a signature from being used multiple times. */ function nonces(address owner) external view returns (uint256); /** * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}. */ // solhint-disable-next-line func-name-mixedcase function DOMAIN_SEPARATOR() external view returns (bytes32); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./ECDSA.sol"; /** * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data. * * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible, * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding * they need in their contracts using a combination of `abi.encode` and `keccak256`. * * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA * ({_hashTypedDataV4}). * * The implementation of the domain separator was designed to be as efficient as possible while still properly updating * the chain id to protect against replay attacks on an eventual fork of the chain. * * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask]. * * _Available since v3.4._ */ abstract contract EIP712 { /* solhint-disable var-name-mixedcase */ // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to // invalidate the cached domain separator if the chain id changes. bytes32 private immutable _CACHED_DOMAIN_SEPARATOR; uint256 private immutable _CACHED_CHAIN_ID; bytes32 private immutable _HASHED_NAME; bytes32 private immutable _HASHED_VERSION; bytes32 private immutable _TYPE_HASH; /* solhint-enable var-name-mixedcase */ /** * @dev Initializes the domain separator and parameter caches. * * The meaning of `name` and `version` is specified in * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]: * * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol. * - `version`: the current major version of the signing domain. * * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart * contract upgrade]. */ constructor(string memory name, string memory version) { bytes32 hashedName = keccak256(bytes(name)); bytes32 hashedVersion = keccak256(bytes(version)); bytes32 typeHash = keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ); _HASHED_NAME = hashedName; _HASHED_VERSION = hashedVersion; _CACHED_CHAIN_ID = block.chainid; _CACHED_DOMAIN_SEPARATOR = _buildDomainSeparator(typeHash, hashedName, hashedVersion); _TYPE_HASH = typeHash; } /** * @dev Returns the domain separator for the current chain. */ function _domainSeparatorV4() internal view returns (bytes32) { if (block.chainid == _CACHED_CHAIN_ID) { return _CACHED_DOMAIN_SEPARATOR; } else { return _buildDomainSeparator(_TYPE_HASH, _HASHED_NAME, _HASHED_VERSION); } } function _buildDomainSeparator( bytes32 typeHash, bytes32 nameHash, bytes32 versionHash ) private view returns (bytes32) { return keccak256(abi.encode(typeHash, nameHash, versionHash, block.chainid, address(this))); } /** * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this * function returns the hash of the fully encoded EIP712 message for this domain. * * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example: * * ```solidity * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode( * keccak256("Mail(address to,string contents)"), * mailTo, * keccak256(bytes(mailContents)) * ))); * address signer = ECDSA.recover(digest, signature); * ``` */ function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) { return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return recover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return recover(hash, r, vs); } else { revert("ECDSA: invalid signature length"); } } /** * @dev Overload of {ECDSA-recover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { bytes32 s; uint8 v; assembly { s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } return recover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. require( uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "ECDSA: invalid signature 's' value" ); require(v == 27 || v == 28, "ECDSA: invalid signature 'v' value"); // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); require(signer != address(0), "ECDSA: invalid signature"); return signer; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; /** * @title Counters * @author Matt Condon (@shrugs) * @dev Provides counters that can only be incremented, decremented or reset. This can be used e.g. to track the number * of elements in a mapping, issuing ERC721 ids, or counting request ids. * * Include with `using Counters for Counters.Counter;` */ library Counters { struct Counter { // This variable should never be directly accessed by users of the library: interactions must be restricted to // the library's function. As of Solidity v0.5.2, this cannot be enforced, though there is a proposal to add // this feature: see https://github.com/ethereum/solidity/issues/4637 uint256 _value; // default: 0 } function current(Counter storage counter) internal view returns (uint256) { return counter._value; } function increment(Counter storage counter) internal { unchecked { counter._value += 1; } } function decrement(Counter storage counter) internal { uint256 value = counter._value; require(value > 0, "Counter: decrement overflow"); unchecked { counter._value = value - 1; } } function reset(Counter storage counter) internal { counter._value = 0; } }
// SPDX-License-Identifier: WTFPL pragma solidity >=0.8.4; import "./IErc20.sol"; /// @notice Emitted when the owner is the zero address. error Erc20__ApproveOwnerZeroAddress(); /// @notice Emitted when the spender is the zero address. error Erc20__ApproveSpenderZeroAddress(); /// @notice Emitted when burning more tokens than are in the account. error Erc20__BurnUnderflow(uint256 accountBalance, uint256 burnAmount); /// @notice Emitted when the holder is the zero address. error Erc20__BurnZeroAddress(); /// @notice Emitted when the sender did not give the caller a sufficient allowance. error Erc20__InsufficientAllowance(uint256 allowance, uint256 amount); /// @notice Emitted when the beneficiary is the zero address. error Erc20__MintZeroAddress(); /// @notice Emitted when tranferring more tokens than there are in the account. error Erc20__TransferUnderflow(uint256 senderBalance, uint256 amount); /// @notice Emitted when the sender is the zero address. error Erc20__TransferSenderZeroAddress(); /// @notice Emitted when the recipient is the zero address. error Erc20__TransferRecipientZeroAddress(); /// @title Erc20 /// @author Paul Razvan Berg contract Erc20 is IErc20 { /// PUBLIC STORAGE /// /// @inheritdoc IErc20 string public override name; /// @inheritdoc IErc20 string public override symbol; /// @inheritdoc IErc20 uint8 public immutable override decimals; /// @inheritdoc IErc20 uint256 public override totalSupply; /// @inheritdoc IErc20 mapping(address => uint256) public override balanceOf; /// @inheritdoc IErc20 mapping(address => mapping(address => uint256)) public override allowance; /// CONSTRUCTOR /// /// @notice All three of these values are immutable: they can only be set once during construction. /// @param _name Erc20 name of this token. /// @param _symbol Erc20 symbol of this token. /// @param _decimals Erc20 decimal precision of this token. constructor( string memory _name, string memory _symbol, uint8 _decimals ) { name = _name; symbol = _symbol; decimals = _decimals; } /// PUBLIC NON-CONSTANT FUNCTIONS /// /// @inheritdoc IErc20 function approve(address spender, uint256 amount) external virtual override returns (bool) { approveInternal(msg.sender, spender, amount); return true; } /// @inheritdoc IErc20 function decreaseAllowance(address spender, uint256 subtractedValue) external virtual override returns (bool) { uint256 newAllowance = allowance[msg.sender][spender] - subtractedValue; approveInternal(msg.sender, spender, newAllowance); return true; } /// @inheritdoc IErc20 function increaseAllowance(address spender, uint256 addedValue) external virtual override returns (bool) { uint256 newAllowance = allowance[msg.sender][spender] + addedValue; approveInternal(msg.sender, spender, newAllowance); return true; } /// @inheritdoc IErc20 function transfer(address recipient, uint256 amount) external virtual override returns (bool) { transferInternal(msg.sender, recipient, amount); return true; } /// @inheritdoc IErc20 function transferFrom( address sender, address recipient, uint256 amount ) external virtual override returns (bool) { transferInternal(sender, recipient, amount); uint256 currentAllowance = allowance[sender][msg.sender]; if (currentAllowance < amount) { revert Erc20__InsufficientAllowance(currentAllowance, amount); } approveInternal(sender, msg.sender, currentAllowance); return true; } /// INTERNAL NON-CONSTANT FUNCTIONS /// /// @notice Sets `amount` as the allowance of `spender` over the `owner`s tokens. /// /// @dev Emits an {Approval} event. /// /// This is internal function is equivalent to `approve`, and can be used to e.g. set automatic /// allowances for certain subsystems, etc. /// /// Requirements: /// /// - `owner` cannot be the zero address. /// - `spender` cannot be the zero address. function approveInternal( address owner, address spender, uint256 amount ) internal virtual { if (owner == address(0)) { revert Erc20__ApproveOwnerZeroAddress(); } if (spender == address(0)) { revert Erc20__ApproveSpenderZeroAddress(); } allowance[owner][spender] = amount; emit Approval(owner, spender, amount); } /// @notice Destroys `burnAmount` tokens from `holder`, reducing the token supply. /// /// @dev Emits a {Transfer} event. /// /// Requirements: /// /// - `holder` must have at least `amount` tokens. function burnInternal(address holder, uint256 burnAmount) internal { if (holder == address(0)) { revert Erc20__BurnZeroAddress(); } uint256 accountBalance = balanceOf[holder]; if (accountBalance < burnAmount) { revert Erc20__BurnUnderflow(accountBalance, burnAmount); } // Burn the tokens. unchecked { balanceOf[holder] = accountBalance - burnAmount; } // Reduce the total supply. totalSupply -= burnAmount; emit Transfer(holder, address(0), burnAmount); } /// @notice Prints new tokens into existence and assigns them to `beneficiary`, increasing the /// total supply. /// /// @dev Emits a {Transfer} event. /// /// Requirements: /// /// - The beneficiary's balance and the total supply cannot overflow. function mintInternal(address beneficiary, uint256 mintAmount) internal { if (beneficiary == address(0)) { revert Erc20__MintZeroAddress(); } /// Mint the new tokens. balanceOf[beneficiary] += mintAmount; /// Increase the total supply. totalSupply += mintAmount; emit Transfer(address(0), beneficiary, mintAmount); } /// @notice Moves `amount` tokens from `sender` to `recipient`. /// /// @dev 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 transferInternal( address sender, address recipient, uint256 amount ) internal virtual { if (sender == address(0)) { revert Erc20__TransferSenderZeroAddress(); } if (recipient == address(0)) { revert Erc20__TransferRecipientZeroAddress(); } uint256 senderBalance = balanceOf[sender]; if (senderBalance < amount) { revert Erc20__TransferUnderflow(senderBalance, amount); } unchecked { balanceOf[sender] = senderBalance - amount; } balanceOf[recipient] += amount; emit Transfer(sender, recipient, amount); } }
// SPDX-License-Identifier: WTFPL // solhint-disable func-name-mixedcase pragma solidity >=0.8.4; import "./IErc20.sol"; /// @title IErc20Permit /// @author Paul Razvan Berg /// @notice Extension of Erc20 that allows token holders to use their tokens without sending any /// transactions by setting the allowance with a signature using the `permit` method, and then spend /// them via `transferFrom`. /// @dev See https://eips.ethereum.org/EIPS/eip-2612. interface IErc20Permit is IErc20 { /// NON-CONSTANT FUNCTIONS /// /// @notice Sets `amount` as the allowance of `spender` over `owner`'s tokens, assuming the latter's /// signed approval. /// /// @dev Emits an {Approval} event. /// /// IMPORTANT: The same issues Erc20 `approve` has related to transaction /// ordering also apply here. /// /// Requirements: /// /// - `owner` cannot be the zero address. /// - `spender` cannot be the zero address. /// - `deadline` must be a timestamp in the future. /// - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner` over the Eip712-formatted /// function arguments. /// - The signature must use `owner`'s current nonce. function permit( address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external; /// CONSTANT FUNCTIONS /// /// @notice The Eip712 domain's keccak256 hash. function DOMAIN_SEPARATOR() external view returns (bytes32); /// @notice Provides replay protection. function nonces(address account) external view returns (uint256); /// @notice keccak256("Permit(address owner,address spender,uint256 amount,uint256 nonce,uint256 deadline)"); function PERMIT_TYPEHASH() external view returns (bytes32); /// @notice Eip712 version of this implementation. function version() external view returns (string memory); }
// SPDX-License-Identifier: WTFPL pragma solidity >=0.8.4; /// @title IErc20 /// @author Paul Razvan Berg /// @notice Implementation for the Erc20 standard. /// /// 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 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 Erc 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. /// /// @dev Forked from OpenZeppelin /// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.4.0/contracts/token/ERC20/ERC20.sol interface IErc20 { /// EVENTS /// /// @notice Emitted when an approval happens. /// @param owner The address of the owner of the tokens. /// @param spender The address of the spender. /// @param amount The maximum amount that can be spent. event Approval(address indexed owner, address indexed spender, uint256 amount); /// @notice Emitted when a transfer happens. /// @param from The account sending the tokens. /// @param to The account receiving the tokens. /// @param amount The amount of tokens transferred. event Transfer(address indexed from, address indexed to, uint256 amount); /// CONSTANT FUNCTIONS /// /// @notice Returns the remaining number of tokens that `spender` will be allowed to spend /// on behalf of `owner` through {transferFrom}. This is zero by default. /// /// @dev This value changes when {approve} or {transferFrom} are called. function allowance(address owner, address spender) external view returns (uint256); /// @notice Returns the amount of tokens owned by `account`. function balanceOf(address account) external view returns (uint256); /// @notice Returns the number of decimals used to get its user representation. function decimals() external view returns (uint8); /// @notice Returns the name of the token. function name() external view returns (string memory); /// @notice Returns the symbol of the token, usually a shorter version of the name. function symbol() external view returns (string memory); /// @notice Returns the amount of tokens in existence. function totalSupply() external view returns (uint256); /// NON-CONSTANT FUNCTIONS /// /// @notice Sets `amount` as the allowance of `spender` over the caller's tokens. /// /// @dev Emits an {Approval} event. /// /// 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 /// /// Requirements: /// /// - `spender` cannot be the zero address. /// /// @return a boolean value indicating whether the operation succeeded. function approve(address spender, uint256 amount) external returns (bool); /// @notice Atomically decreases the allowance granted to `spender` by the caller. /// /// @dev Emits an {Approval} event indicating the updated allowance. /// /// This is an alternative to {approve} that can be used as a mitigation for problems described /// in {Erc20Interface-approve}. /// /// Requirements: /// /// - `spender` cannot be the zero address. /// - `spender` must have allowance for the caller of at least `subtractedValue`. function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool); /// @notice Atomically increases the allowance granted to `spender` by the caller. /// /// @dev Emits an {Approval} event indicating the updated allowance. /// /// This is an alternative to {approve} that can be used as a mitigation for the problems described above. /// /// Requirements: /// /// - `spender` cannot be the zero address. function increaseAllowance(address spender, uint256 addedValue) external returns (bool); /// @notice Moves `amount` tokens from the caller's account to `recipient`. /// /// @dev Emits a {Transfer} event. /// /// Requirements: /// /// - `recipient` cannot be the zero address. /// - The caller must have a balance of at least `amount`. /// /// @return a boolean value indicating whether the operation succeeded. function transfer(address recipient, uint256 amount) external returns (bool); /// @notice Moves `amount` tokens from `sender` to `recipient` using the allowance mechanism. `amount` /// `is then deducted from the caller's allowance. /// /// @dev Emits a {Transfer} event and an {Approval} event indicating the updated allowance. This is /// not required by the Erc. 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 approed `sender` to spent at least `amount` tokens. /// /// @return a boolean value indicating whether the operation succeeded. function transferFrom( address sender, address recipient, uint256 amount ) external returns (bool); }
{ "optimizer": { "enabled": true, "runs": 10000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "metadata": { "useLiteralContent": true }, "libraries": {} }
Contract Security Audit
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
00000000000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000f436f6e737469747574696f6e44414f0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000650454f504c450000000000000000000000000000000000000000000000000000
-----Decoded View---------------
Arg [0] : _name (string): ConstitutionDAO
Arg [1] : _symbol (string): PEOPLE
-----Encoded View---------------
6 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000040
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [2] : 000000000000000000000000000000000000000000000000000000000000000f
Arg [3] : 436f6e737469747574696f6e44414f0000000000000000000000000000000000
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000006
Arg [5] : 50454f504c450000000000000000000000000000000000000000000000000000
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