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ERC-20
Staking
Add Token to MetaMask (Web3)Overview
Max Total Supply
971.105794771718129629 ESG
Holders
68 (0.00%)
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
0.02108982632254312 ESGValue
$0.00Loading...
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| # | Exchange | Pair | Price | 24H Volume | % Volume |
|---|
Contract Name:
Gold
Compiler Version
v0.5.17+commit.d19bba13
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/**
*Submitted for verification at Etherscan.io on 2020-12-26
*/
pragma solidity ^0.5.17;
pragma experimental ABIEncoderV2;
/*
* @dev Provides information about the current execution context, including the
* sender of the transaction and its data. While these are generally available
* via msg.sender and msg.data, they should not be accessed in such a direct
* manner, since when dealing with GSN meta-transactions the account sending and
* paying for execution may not be the actual sender (as far as an application
* is concerned).
*
* This contract is only required for intermediate, library-like contracts.
*/
contract Context {
// Empty internal constructor, to prevent people from mistakenly deploying
// an instance of this contract, which should be used via inheritance.
constructor () internal { }
// solhint-disable-previous-line no-empty-blocks
function _msgSender() internal view returns (address payable) {
return msg.sender;
}
function _msgData() internal view returns (bytes memory) {
this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
return msg.data;
}
}
/**
* @dev Interface of the ERC20 standard as defined in the EIP. Does not include
* the optional functions; to access them see {ERC20Detailed}.
*/
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 Wrappers over Solidity's arithmetic operations with added overflow
* checks.
*
* Arithmetic operations in Solidity wrap on overflow. This can easily result
* in bugs, because programmers usually assume that an overflow raises an
* error, which is the standard behavior in high level programming languages.
* `SafeMath` restores this intuition by reverting the transaction when an
* operation overflows.
*
* Using this library instead of the unchecked operations eliminates an entire
* class of bugs, so it's recommended to use it always.
*/
library SafeMath {
/**
* @dev Returns the addition of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `+` operator.
*
* Requirements:
* - Addition cannot overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a, "SafeMath: addition overflow");
return c;
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
return sub(a, b, "SafeMath: subtraction overflow");
}
/**
* @dev Returns the subtraction of two unsigned integers, reverting with custom message on
* overflow (when the result is negative).
*
* Counterpart to Solidity's `-` operator.
*
* Requirements:
* - Subtraction cannot overflow.
*
* _Available since v2.4.0._
*/
function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b <= a, errorMessage);
uint256 c = a - b;
return c;
}
/**
* @dev Returns the multiplication of two unsigned integers, reverting on
* overflow.
*
* Counterpart to Solidity's `*` operator.
*
* Requirements:
* - Multiplication cannot overflow.
*/
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
// Gas optimization: this is cheaper than requiring 'a' not being zero, but the
// benefit is lost if 'b' is also tested.
// See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b, "SafeMath: multiplication overflow");
return c;
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
return div(a, b, "SafeMath: division by zero");
}
/**
* @dev Returns the integer division of two unsigned integers. Reverts with custom message on
* division by zero. The result is rounded towards zero.
*
* Counterpart to Solidity's `/` operator. Note: this function uses a
* `revert` opcode (which leaves remaining gas untouched) while Solidity
* uses an invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0, errorMessage);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
return mod(a, b, "SafeMath: modulo by zero");
}
/**
* @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
* Reverts with custom message when dividing by zero.
*
* Counterpart to Solidity's `%` operator. This function uses a `revert`
* opcode (which leaves remaining gas untouched) while Solidity uses an
* invalid opcode to revert (consuming all remaining gas).
*
* Requirements:
* - The divisor cannot be zero.
*
* _Available since v2.4.0._
*/
function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
require(b != 0, errorMessage);
return a % b;
}
}
/**
* @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 {ERC20Mintable}.
*
* 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 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowances;
uint256 private _totalSupply;
/**
* @dev See {IERC20-totalSupply}.
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev See {IERC20-balanceOf}.
*/
function balanceOf(address account) public view 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 returns (bool) {
_transfer(_msgSender(), recipient, amount);
return true;
}
/**
* @dev See {IERC20-allowance}.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowances[owner][spender];
}
/**
* @dev See {IERC20-approve}.
*
* Requirements:
*
* - `spender` cannot be the zero address.
*/
function approve(address spender, uint256 amount) public 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 returns (bool) {
_transfer(sender, recipient, amount);
_approve(sender, _msgSender(), _allowances[sender][_msgSender()].sub(amount, "ERC20: transfer amount exceeds allowance"));
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 returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].add(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 returns (bool) {
_approve(_msgSender(), spender, _allowances[_msgSender()][spender].sub(subtractedValue, "ERC20: decreased allowance below zero"));
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 {
require(sender != address(0), "ERC20: transfer from the zero address");
require(recipient != address(0), "ERC20: transfer to the zero address");
_balances[sender] = _balances[sender].sub(amount, "ERC20: transfer amount exceeds balance");
_balances[recipient] = _balances[recipient].add(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 {
require(account != address(0), "ERC20: mint to the zero address");
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(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 {
require(account != address(0), "ERC20: burn from the zero address");
_balances[account] = _balances[account].sub(amount, "ERC20: burn amount exceeds balance");
_totalSupply = _totalSupply.sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @dev Sets `amount` as the allowance of `spender` over the `owner`s tokens.
*
* This is 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 {
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 Destroys `amount` tokens from `account`.`amount` is then deducted
* from the caller's allowance.
*
* See {_burn} and {_approve}.
*/
function _burnFrom(address account, uint256 amount) internal {
_burn(account, amount);
_approve(account, _msgSender(), _allowances[account][_msgSender()].sub(amount, "ERC20: burn amount exceeds allowance"));
}
}
/**
* @dev Extension of {ERC20} that allows token holders to destroy both their own
* tokens and those that they have an allowance for, in a way that can be
* recognized off-chain (via event analysis).
*/
contract ERC20Burnable is Context, ERC20 {
/**
* @dev Destroys `amount` tokens from the caller.
*
* See {ERC20-_burn}.
*/
function burn(uint256 amount) public {
_burn(_msgSender(), amount);
}
/**
* @dev See {ERC20-_burnFrom}.
*/
function burnFrom(address account, uint256 amount) public {
_burnFrom(account, amount);
}
}
/**
* @dev Optional functions from the ERC20 standard.
*/
contract ERC20Detailed is IERC20 {
string private _name;
string private _symbol;
uint8 private _decimals;
/**
* @dev Sets the values for `name`, `symbol`, and `decimals`. All three of
* these values are immutable: they can only be set once during
* construction.
*/
constructor (string memory name, string memory symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @dev Returns the name of the token.
*/
function name() public view returns (string memory) {
return _name;
}
/**
* @dev Returns the symbol of the token, usually a shorter version of the
* name.
*/
function symbol() public view 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.
*
* 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 returns (uint8) {
return _decimals;
}
}
/**
* @title Roles
* @dev Library for managing addresses assigned to a Role.
*/
library Roles {
struct Role {
mapping (address => bool) bearer;
}
/**
* @dev Give an account access to this role.
*/
function add(Role storage role, address account) internal {
require(!has(role, account), "Roles: account already has role");
role.bearer[account] = true;
}
/**
* @dev Remove an account's access to this role.
*/
function remove(Role storage role, address account) internal {
require(has(role, account), "Roles: account does not have role");
role.bearer[account] = false;
}
/**
* @dev Check if an account has this role.
* @return bool
*/
function has(Role storage role, address account) internal view returns (bool) {
require(account != address(0), "Roles: account is the zero address");
return role.bearer[account];
}
}
contract MinterRole is Context {
using Roles for Roles.Role;
event MinterAdded(address indexed account);
event MinterRemoved(address indexed account);
Roles.Role private _minters;
constructor () internal {
_addMinter(_msgSender());
}
modifier onlyMinter() {
require(isMinter(_msgSender()), "MinterRole: caller does not have the Minter role");
_;
}
function isMinter(address account) public view returns (bool) {
return _minters.has(account);
}
function addMinter(address account) public onlyMinter {
_addMinter(account);
}
function renounceMinter() public {
_removeMinter(_msgSender());
}
function _addMinter(address account) internal {
_minters.add(account);
emit MinterAdded(account);
}
function _removeMinter(address account) internal {
_minters.remove(account);
emit MinterRemoved(account);
}
}
/**
* @title Require
* @author dYdX
*
* Stringifies parameters to pretty-print revert messages. Costs more gas than regular require()
*/
library Require {
// ============ Constants ============
uint256 constant ASCII_ZERO = 48; // '0'
uint256 constant ASCII_RELATIVE_ZERO = 87; // 'a' - 10
uint256 constant ASCII_LOWER_EX = 120; // 'x'
bytes2 constant COLON = 0x3a20; // ': '
bytes2 constant COMMA = 0x2c20; // ', '
bytes2 constant LPAREN = 0x203c; // ' <'
byte constant RPAREN = 0x3e; // '>'
uint256 constant FOUR_BIT_MASK = 0xf;
// ============ Library Functions ============
function that(
bool must,
bytes32 file,
bytes32 reason
)
internal
pure
{
if (!must) {
revert(
string(
abi.encodePacked(
stringifyTruncated(file),
COLON,
stringifyTruncated(reason)
)
)
);
}
}
function that(
bool must,
bytes32 file,
bytes32 reason,
uint256 payloadA
)
internal
pure
{
if (!must) {
revert(
string(
abi.encodePacked(
stringifyTruncated(file),
COLON,
stringifyTruncated(reason),
LPAREN,
stringify(payloadA),
RPAREN
)
)
);
}
}
function that(
bool must,
bytes32 file,
bytes32 reason,
uint256 payloadA,
uint256 payloadB
)
internal
pure
{
if (!must) {
revert(
string(
abi.encodePacked(
stringifyTruncated(file),
COLON,
stringifyTruncated(reason),
LPAREN,
stringify(payloadA),
COMMA,
stringify(payloadB),
RPAREN
)
)
);
}
}
function that(
bool must,
bytes32 file,
bytes32 reason,
address payloadA
)
internal
pure
{
if (!must) {
revert(
string(
abi.encodePacked(
stringifyTruncated(file),
COLON,
stringifyTruncated(reason),
LPAREN,
stringify(payloadA),
RPAREN
)
)
);
}
}
function that(
bool must,
bytes32 file,
bytes32 reason,
address payloadA,
uint256 payloadB
)
internal
pure
{
if (!must) {
revert(
string(
abi.encodePacked(
stringifyTruncated(file),
COLON,
stringifyTruncated(reason),
LPAREN,
stringify(payloadA),
COMMA,
stringify(payloadB),
RPAREN
)
)
);
}
}
function that(
bool must,
bytes32 file,
bytes32 reason,
address payloadA,
uint256 payloadB,
uint256 payloadC
)
internal
pure
{
if (!must) {
revert(
string(
abi.encodePacked(
stringifyTruncated(file),
COLON,
stringifyTruncated(reason),
LPAREN,
stringify(payloadA),
COMMA,
stringify(payloadB),
COMMA,
stringify(payloadC),
RPAREN
)
)
);
}
}
function that(
bool must,
bytes32 file,
bytes32 reason,
bytes32 payloadA
)
internal
pure
{
if (!must) {
revert(
string(
abi.encodePacked(
stringifyTruncated(file),
COLON,
stringifyTruncated(reason),
LPAREN,
stringify(payloadA),
RPAREN
)
)
);
}
}
function that(
bool must,
bytes32 file,
bytes32 reason,
bytes32 payloadA,
uint256 payloadB,
uint256 payloadC
)
internal
pure
{
if (!must) {
revert(
string(
abi.encodePacked(
stringifyTruncated(file),
COLON,
stringifyTruncated(reason),
LPAREN,
stringify(payloadA),
COMMA,
stringify(payloadB),
COMMA,
stringify(payloadC),
RPAREN
)
)
);
}
}
// ============ Private Functions ============
function stringifyTruncated(
bytes32 input
)
private
pure
returns (bytes memory)
{
// put the input bytes into the result
bytes memory result = abi.encodePacked(input);
// determine the length of the input by finding the location of the last non-zero byte
for (uint256 i = 32; i > 0; ) {
// reverse-for-loops with unsigned integer
/* solium-disable-next-line security/no-modify-for-iter-var */
i--;
// find the last non-zero byte in order to determine the length
if (result[i] != 0) {
uint256 length = i + 1;
/* solium-disable-next-line security/no-inline-assembly */
assembly {
mstore(result, length) // r.length = length;
}
return result;
}
}
// all bytes are zero
return new bytes(0);
}
function stringify(
uint256 input
)
private
pure
returns (bytes memory)
{
if (input == 0) {
return "0";
}
// get the final string length
uint256 j = input;
uint256 length;
while (j != 0) {
length++;
j /= 10;
}
// allocate the string
bytes memory bstr = new bytes(length);
// populate the string starting with the least-significant character
j = input;
for (uint256 i = length; i > 0; ) {
// reverse-for-loops with unsigned integer
/* solium-disable-next-line security/no-modify-for-iter-var */
i--;
// take last decimal digit
bstr[i] = byte(uint8(ASCII_ZERO + (j % 10)));
// remove the last decimal digit
j /= 10;
}
return bstr;
}
function stringify(
address input
)
private
pure
returns (bytes memory)
{
uint256 z = uint256(input);
// addresses are "0x" followed by 20 bytes of data which take up 2 characters each
bytes memory result = new bytes(42);
// populate the result with "0x"
result[0] = byte(uint8(ASCII_ZERO));
result[1] = byte(uint8(ASCII_LOWER_EX));
// for each byte (starting from the lowest byte), populate the result with two characters
for (uint256 i = 0; i < 20; i++) {
// each byte takes two characters
uint256 shift = i * 2;
// populate the least-significant character
result[41 - shift] = char(z & FOUR_BIT_MASK);
z = z >> 4;
// populate the most-significant character
result[40 - shift] = char(z & FOUR_BIT_MASK);
z = z >> 4;
}
return result;
}
function stringify(
bytes32 input
)
private
pure
returns (bytes memory)
{
uint256 z = uint256(input);
// bytes32 are "0x" followed by 32 bytes of data which take up 2 characters each
bytes memory result = new bytes(66);
// populate the result with "0x"
result[0] = byte(uint8(ASCII_ZERO));
result[1] = byte(uint8(ASCII_LOWER_EX));
// for each byte (starting from the lowest byte), populate the result with two characters
for (uint256 i = 0; i < 32; i++) {
// each byte takes two characters
uint256 shift = i * 2;
// populate the least-significant character
result[65 - shift] = char(z & FOUR_BIT_MASK);
z = z >> 4;
// populate the most-significant character
result[64 - shift] = char(z & FOUR_BIT_MASK);
z = z >> 4;
}
return result;
}
function char(
uint256 input
)
private
pure
returns (byte)
{
// return ASCII digit (0-9)
if (input < 10) {
return byte(uint8(input + ASCII_ZERO));
}
// return ASCII letter (a-f)
return byte(uint8(input + ASCII_RELATIVE_ZERO));
}
}
library LibEIP712 {
// Hash of the EIP712 Domain Separator Schema
// keccak256(abi.encodePacked(
// "EIP712Domain(",
// "string name,",
// "string version,",
// "uint256 chainId,",
// "address verifyingContract",
// ")"
// ))
bytes32 constant internal _EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;
/// @dev Calculates a EIP712 domain separator.
/// @param name The EIP712 domain name.
/// @param version The EIP712 domain version.
/// @param verifyingContract The EIP712 verifying contract.
/// @return EIP712 domain separator.
function hashEIP712Domain(
string memory name,
string memory version,
uint256 chainId,
address verifyingContract
)
internal
pure
returns (bytes32 result)
{
bytes32 schemaHash = _EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH;
// Assembly for more efficient computing:
// keccak256(abi.encodePacked(
// _EIP712_DOMAIN_SEPARATOR_SCHEMA_HASH,
// keccak256(bytes(name)),
// keccak256(bytes(version)),
// chainId,
// uint256(verifyingContract)
// ))
assembly {
// Calculate hashes of dynamic data
let nameHash := keccak256(add(name, 32), mload(name))
let versionHash := keccak256(add(version, 32), mload(version))
// Load free memory pointer
let memPtr := mload(64)
// Store params in memory
mstore(memPtr, schemaHash)
mstore(add(memPtr, 32), nameHash)
mstore(add(memPtr, 64), versionHash)
mstore(add(memPtr, 96), chainId)
mstore(add(memPtr, 128), verifyingContract)
// Compute hash
result := keccak256(memPtr, 160)
}
return result;
}
/// @dev Calculates EIP712 encoding for a hash struct with a given domain hash.
/// @param eip712DomainHash Hash of the domain domain separator data, computed
/// with getDomainHash().
/// @param hashStruct The EIP712 hash struct.
/// @return EIP712 hash applied to the given EIP712 Domain.
function hashEIP712Message(bytes32 eip712DomainHash, bytes32 hashStruct)
internal
pure
returns (bytes32 result)
{
// Assembly for more efficient computing:
// keccak256(abi.encodePacked(
// EIP191_HEADER,
// EIP712_DOMAIN_HASH,
// hashStruct
// ));
assembly {
// Load free memory pointer
let memPtr := mload(64)
mstore(memPtr, 0x1901000000000000000000000000000000000000000000000000000000000000) // EIP191 header
mstore(add(memPtr, 2), eip712DomainHash) // EIP712 domain hash
mstore(add(memPtr, 34), hashStruct) // Hash of struct
// Compute hash
result := keccak256(memPtr, 66)
}
return result;
}
}
/**
* @title Decimal
* @author dYdX
*
* Library that defines a fixed-point number with 18 decimal places.
*/
library Decimal {
using SafeMath for uint256;
// ============ Constants ============
uint256 constant BASE = 10**18;
// ============ Structs ============
struct D256 {
uint256 value;
}
// ============ Static Functions ============
function zero()
internal
pure
returns (D256 memory)
{
return D256({ value: 0 });
}
function one()
internal
pure
returns (D256 memory)
{
return D256({ value: BASE });
}
function from(
uint256 a
)
internal
pure
returns (D256 memory)
{
return D256({ value: a.mul(BASE) });
}
function ratio(
uint256 a,
uint256 b
)
internal
pure
returns (D256 memory)
{
return D256({ value: getPartial(a, BASE, b) });
}
// ============ Self Functions ============
function add(
D256 memory self,
uint256 b
)
internal
pure
returns (D256 memory)
{
return D256({ value: self.value.add(b.mul(BASE)) });
}
function sub(
D256 memory self,
uint256 b
)
internal
pure
returns (D256 memory)
{
return D256({ value: self.value.sub(b.mul(BASE)) });
}
function sub(
D256 memory self,
uint256 b,
string memory reason
)
internal
pure
returns (D256 memory)
{
return D256({ value: self.value.sub(b.mul(BASE), reason) });
}
function mul(
D256 memory self,
uint256 b
)
internal
pure
returns (D256 memory)
{
return D256({ value: self.value.mul(b) });
}
function div(
D256 memory self,
uint256 b
)
internal
pure
returns (D256 memory)
{
return D256({ value: self.value.div(b) });
}
function pow(
D256 memory self,
uint256 b
)
internal
pure
returns (D256 memory)
{
if (b == 0) {
return from(1);
}
D256 memory temp = D256({ value: self.value });
for (uint256 i = 1; i < b; i++) {
temp = mul(temp, self);
}
return temp;
}
function add(
D256 memory self,
D256 memory b
)
internal
pure
returns (D256 memory)
{
return D256({ value: self.value.add(b.value) });
}
function sub(
D256 memory self,
D256 memory b
)
internal
pure
returns (D256 memory)
{
return D256({ value: self.value.sub(b.value) });
}
function sub(
D256 memory self,
D256 memory b,
string memory reason
)
internal
pure
returns (D256 memory)
{
return D256({ value: self.value.sub(b.value, reason) });
}
function mul(
D256 memory self,
D256 memory b
)
internal
pure
returns (D256 memory)
{
return D256({ value: getPartial(self.value, b.value, BASE) });
}
function div(
D256 memory self,
D256 memory b
)
internal
pure
returns (D256 memory)
{
return D256({ value: getPartial(self.value, BASE, b.value) });
}
function equals(D256 memory self, D256 memory b) internal pure returns (bool) {
return self.value == b.value;
}
function greaterThan(D256 memory self, D256 memory b) internal pure returns (bool) {
return compareTo(self, b) == 2;
}
function lessThan(D256 memory self, D256 memory b) internal pure returns (bool) {
return compareTo(self, b) == 0;
}
function greaterThanOrEqualTo(D256 memory self, D256 memory b) internal pure returns (bool) {
return compareTo(self, b) > 0;
}
function lessThanOrEqualTo(D256 memory self, D256 memory b) internal pure returns (bool) {
return compareTo(self, b) < 2;
}
function isZero(D256 memory self) internal pure returns (bool) {
return self.value == 0;
}
function asUint256(D256 memory self) internal pure returns (uint256) {
return self.value.div(BASE);
}
// ============ Core Methods ============
function getPartial(
uint256 target,
uint256 numerator,
uint256 denominator
)
private
pure
returns (uint256)
{
return target.mul(numerator).div(denominator);
}
function compareTo(
D256 memory a,
D256 memory b
)
private
pure
returns (uint256)
{
if (a.value == b.value) {
return 1;
}
return a.value > b.value ? 2 : 0;
}
}
library Constants {
/* Chain */
uint256 private constant CHAIN_ID = 1; // Mainnet
/* Bootstrapping */
uint256 private constant BOOTSTRAPPING_PERIOD = 56; // 14 days
uint256 private constant BOOTSTRAPPING_PRICE = 11e17; // ESG price == 1.10 * sXAU
/* Oracle */
address private constant sXAU = address(0x261EfCdD24CeA98652B9700800a13DfBca4103fF);
uint256 private constant ORACLE_RESERVE_MINIMUM = 1e18;
/* Bonding */
uint256 private constant INITIAL_STAKE_MULTIPLE = 1e6; // 100 ESG -> 100M ESGS
/* Epoch */
struct EpochStrategy {
uint256 offset;
uint256 start;
uint256 period;
}
uint256 private constant EPOCH_START = 1609027200; // 2020-12-27T00:00:00+00:00
uint256 private constant EPOCH_OFFSET = 0;
uint256 private constant EPOCH_PERIOD = 21600; // 6 hours
/* Governance */
uint256 private constant GOVERNANCE_PERIOD = 9; // 9 epochs
uint256 private constant GOVERNANCE_EXPIRATION = 2; // 2 + 1 epochs
uint256 private constant GOVERNANCE_QUORUM = 20e16; // 20%
uint256 private constant GOVERNANCE_PROPOSAL_THRESHOLD = 5e15; // 0.5%
uint256 private constant GOVERNANCE_SUPER_MAJORITY = 66e16; // 66%
uint256 private constant GOVERNANCE_EMERGENCY_DELAY = 6; // 6 epochs
/* DAO */
uint256 private constant ADVANCE_INCENTIVE = 1e17; // 0.1 ESG
uint256 private constant DAO_EXIT_LOCKUP_EPOCHS = 20; // 5 days
/* Pool */
uint256 private constant POOL_EXIT_LOCKUP_EPOCHS = 8; // 2 days
/* Market */
uint256 private constant COUPON_EXPIRATION = 120; // 30 days
uint256 private constant DEBT_RATIO_CAP = 35e16; // 35%
/* Regulator */
uint256 private constant SUPPLY_CHANGE_LIMIT = 1e17; // 10%
uint256 private constant COUPON_SUPPLY_CHANGE_LIMIT = 6e16; // 6%
uint256 private constant ORACLE_POOL_RATIO = 20; // 20%
uint256 private constant TREASURY_RATIO = 250; // 2.5%, until TREASURY_ADDRESS is set, this portion is sent to LP
// TODO: vote on recipient
address private constant TREASURY_ADDRESS = address(0x0000000000000000000000000000000000000000);
function getSXAUAddress() internal pure returns (address) {
return sXAU;
}
function getOracleReserveMinimum() internal pure returns (uint256) {
return ORACLE_RESERVE_MINIMUM;
}
function getCurrentEpochStrategy() internal pure returns (EpochStrategy memory) {
return EpochStrategy({
offset: EPOCH_OFFSET,
start: EPOCH_START,
period: EPOCH_PERIOD
});
}
function getInitialStakeMultiple() internal pure returns (uint256) {
return INITIAL_STAKE_MULTIPLE;
}
function getBootstrappingPeriod() internal pure returns (uint256) {
return BOOTSTRAPPING_PERIOD;
}
function getBootstrappingPrice() internal pure returns (Decimal.D256 memory) {
return Decimal.D256({value: BOOTSTRAPPING_PRICE});
}
function getGovernancePeriod() internal pure returns (uint256) {
return GOVERNANCE_PERIOD;
}
function getGovernanceExpiration() internal pure returns (uint256) {
return GOVERNANCE_EXPIRATION;
}
function getGovernanceQuorum() internal pure returns (Decimal.D256 memory) {
return Decimal.D256({value: GOVERNANCE_QUORUM});
}
function getGovernanceProposalThreshold() internal pure returns (Decimal.D256 memory) {
return Decimal.D256({value: GOVERNANCE_PROPOSAL_THRESHOLD});
}
function getGovernanceSuperMajority() internal pure returns (Decimal.D256 memory) {
return Decimal.D256({value: GOVERNANCE_SUPER_MAJORITY});
}
function getGovernanceEmergencyDelay() internal pure returns (uint256) {
return GOVERNANCE_EMERGENCY_DELAY;
}
function getAdvanceIncentive() internal pure returns (uint256) {
return ADVANCE_INCENTIVE;
}
function getDAOExitLockupEpochs() internal pure returns (uint256) {
return DAO_EXIT_LOCKUP_EPOCHS;
}
function getPoolExitLockupEpochs() internal pure returns (uint256) {
return POOL_EXIT_LOCKUP_EPOCHS;
}
function getCouponExpiration() internal pure returns (uint256) {
return COUPON_EXPIRATION;
}
function getDebtRatioCap() internal pure returns (Decimal.D256 memory) {
return Decimal.D256({value: DEBT_RATIO_CAP});
}
function getSupplyChangeLimit() internal pure returns (Decimal.D256 memory) {
return Decimal.D256({value: SUPPLY_CHANGE_LIMIT});
}
function getCouponSupplyChangeLimit() internal pure returns (Decimal.D256 memory) {
return Decimal.D256({value: COUPON_SUPPLY_CHANGE_LIMIT});
}
function getOraclePoolRatio() internal pure returns (uint256) {
return ORACLE_POOL_RATIO;
}
function getTreasuryRatio() internal pure returns (uint256) {
return TREASURY_RATIO;
}
function getChainId() internal pure returns (uint256) {
return CHAIN_ID;
}
function getTreasuryAddress() internal pure returns (address) {
return TREASURY_ADDRESS;
}
}
contract Permittable is ERC20Detailed, ERC20 {
bytes32 constant FILE = "Permittable";
// keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
bytes32 public constant EIP712_PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
string private constant EIP712_VERSION = "1";
bytes32 public EIP712_DOMAIN_SEPARATOR;
mapping(address => uint256) nonces;
constructor() public {
EIP712_DOMAIN_SEPARATOR = LibEIP712.hashEIP712Domain(name(), EIP712_VERSION, Constants.getChainId(), address(this));
}
function permit(
address owner,
address spender,
uint256 value,
uint256 deadline,
uint8 v,
bytes32 r,
bytes32 s
) external {
bytes32 digest = LibEIP712.hashEIP712Message(
EIP712_DOMAIN_SEPARATOR,
keccak256(abi.encode(
EIP712_PERMIT_TYPEHASH,
owner,
spender,
value,
nonces[owner]++,
deadline
))
);
address recovered = ecrecover(digest, v, r, s);
Require.that(
recovered == owner,
FILE,
"Invalid signature"
);
Require.that(
recovered != address(0),
FILE,
"Zero address"
);
Require.that(
now <= deadline,
FILE,
"Expired"
);
_approve(owner, spender, value);
}
}
contract IGold is IERC20 {
function burn(uint256 amount) public;
function burnFrom(address account, uint256 amount) public;
function mint(address account, uint256 amount) public returns (bool);
}
contract Gold is IGold, MinterRole, ERC20Detailed, Permittable, ERC20Burnable {
constructor()
ERC20Detailed("Empty Set Gold", "ESG", 18)
Permittable()
public
{ }
function mint(address account, uint256 amount) public onlyMinter returns (bool) {
_mint(account, amount);
return true;
}
function transferFrom(address sender, address recipient, uint256 amount) public returns (bool) {
_transfer(sender, recipient, amount);
if (allowance(sender, _msgSender()) != uint256(-1)) {
_approve(
sender,
_msgSender(),
allowance(sender, _msgSender()).sub(amount, "Gold: transfer amount exceeds allowance"));
}
return true;
}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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ble":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"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"}],"payable":false,"stateMutability":"nonpayable","type":"function"}]Contract Creation Code
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