/**
██╗    ██╗██████╗ ███████╗███╗   ███╗ █████╗ ██████╗ ████████╗ ██████╗ ██████╗ ███╗   ██╗████████╗██████╗  █████╗  ██████╗████████╗███████╗    ██████╗ ██████╗ ███╗   ███╗
██║    ██║██╔══██╗██╔════╝████╗ ████║██╔══██╗██╔══██╗╚══██╔══╝██╔════╝██╔═══██╗████╗  ██║╚══██╔══╝██╔══██╗██╔══██╗██╔════╝╚══██╔══╝██╔════╝   ██╔════╝██╔═══██╗████╗ ████║
██║ █╗ ██║██████╔╝███████╗██╔████╔██║███████║██████╔╝   ██║   ██║     ██║   ██║██╔██╗ ██║   ██║   ██████╔╝███████║██║        ██║   ███████╗   ██║     ██║   ██║██╔████╔██║
██║███╗██║██╔═══╝ ╚════██║██║╚██╔╝██║██╔══██║██╔══██╗   ██║   ██║     ██║   ██║██║╚██╗██║   ██║   ██╔══██╗██╔══██║██║        ██║   ╚════██║   ██║     ██║   ██║██║╚██╔╝██║
╚███╔███╔╝██║     ███████║██║ ╚═╝ ██║██║  ██║██║  ██║   ██║   ╚██████╗╚██████╔╝██║ ╚████║   ██║   ██║  ██║██║  ██║╚██████╗   ██║   ███████║██╗╚██████╗╚██████╔╝██║ ╚═╝ ██║
╚══╝╚══╝ ╚═╝     ╚══════╝╚═╝     ╚═╝╚═╝  ╚═╝╚═╝  ╚═╝   ╚═╝    ╚═════╝ ╚═════╝ ╚═╝  ╚═══╝   ╚═╝   ╚═╝  ╚═╝╚═╝  ╚═╝ ╚═════╝   ╚═╝   ╚══════╝╚═╝ ╚═════╝ ╚═════╝ ╚═╝     ╚═╝
Blockchain Made Easy
https://wpsmartcontracts.com/
*/
pragma solidity ^0.5.7;
/**
* @title SafeMath
* @dev Math operations with safety checks that revert on error
*/
library SafeMath {
int256 constant private INT256_MIN = -2**255;
/**
* @dev Multiplies two unsigned integers, reverts on 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-solidity/pull/522
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Multiplies two signed integers, reverts on overflow.
*/
function mul(int256 a, int256 b) internal pure returns (int256) {
// 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-solidity/pull/522
if (a == 0) {
return 0;
}
require(!(a == -1 && b == INT256_MIN)); // This is the only case of overflow not detected by the check below
int256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// Solidity only automatically asserts when dividing by 0
require(b > 0);
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Integer division of two signed integers truncating the quotient, reverts on division by zero.
*/
function div(int256 a, int256 b) internal pure returns (int256) {
require(b != 0); // Solidity only automatically asserts when dividing by 0
require(!(b == -1 && a == INT256_MIN)); // This is the only case of overflow
int256 c = a / b;
return c;
}
/**
* @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend).
*/
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
require(b <= a);
uint256 c = a - b;
return c;
}
/**
* @dev Subtracts two signed integers, reverts on overflow.
*/
function sub(int256 a, int256 b) internal pure returns (int256) {
int256 c = a - b;
require((b >= 0 && c <= a) || (b < 0 && c > a));
return c;
}
/**
* @dev Adds two unsigned integers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Adds two signed integers, reverts on overflow.
*/
function add(int256 a, int256 b) internal pure returns (int256) {
int256 c = a + b;
require((b >= 0 && c >= a) || (b < 0 && c < a));
return c;
}
/**
* @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo),
* reverts when dividing by zero.
*/
function mod(uint256 a, uint256 b) internal pure returns (uint256) {
require(b != 0);
return a % b;
}
}
/**
* @title ERC20 interface
* @dev see https://github.com/ethereum/EIPs/issues/20
*/
interface IERC20 {
function totalSupply() external view returns (uint256);
function balanceOf(address who) external view returns (uint256);
function allowance(address owner, address spender) external view returns (uint256);
function transfer(address to, uint256 value) external returns (bool);
function approve(address spender, uint256 value) external returns (bool);
function transferFrom(address from, address to, uint256 value) external returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract ERC20Pistachio is IERC20 {
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping (address => mapping (address => uint256)) private _allowed;
uint256 private _totalSupply;
/**
* @dev Public parameters to define the token
*/
// Token symbol (short)
string public symbol;
// Token name (Long)
string public  name;
// Decimals (18 maximum)
uint8 public decimals;
/**
* @dev Public functions to make the contract accesible
*/
constructor (address initialAccount, string memory _tokenSymbol, string memory _tokenName, uint256 initialBalance) public {
// Initialize Contract Parameters
symbol = _tokenSymbol;
name = _tokenName;
decimals = 18;  // default decimals is going to be 18 always
_mint(initialAccount, initialBalance);
}
/**
* @dev Total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
/**
* @dev Gets the balance of the specified address.
* @param owner The address to query the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address owner) public view returns (uint256) {
return _balances[owner];
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param owner address The address which owns the funds.
* @param spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address owner, address spender) public view returns (uint256) {
return _allowed[owner][spender];
}
/**
* @dev Transfer token for a specified address
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/
function transfer(address to, uint256 value) public returns (bool) {
_transfer(msg.sender, to, value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
* 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
* @param spender The address which will spend the funds.
* @param value The amount of tokens to be spent.
*/
function approve(address spender, uint256 value) public returns (bool) {
require(spender != address(0));
_allowed[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
/**
* @dev Transfer tokens from one address to another.
* Note that while this function emits an Approval event, this is not required as per the specification,
* and other compliant implementations may not emit the event.
* @param from address The address which you want to send tokens from
* @param to address The address which you want to transfer to
* @param value uint256 the amount of tokens to be transferred
*/
function transferFrom(address from, address to, uint256 value) public returns (bool) {
_allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
_transfer(from, to, value);
emit Approval(from, msg.sender, _allowed[from][msg.sender]);
return true;
}
/**
* @dev Increase the amount of tokens that an owner allowed to a spender.
* approve should be called when allowed_[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* Emits an Approval event.
* @param spender The address which will spend the funds.
* @param addedValue The amount of tokens to increase the allowance by.
*/
function increaseAllowance(address spender, uint256 addedValue) public returns (bool) {
require(spender != address(0));
_allowed[msg.sender][spender] = _allowed[msg.sender][spender].add(addedValue);
emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
return true;
}
/**
* @dev Decrease the amount of tokens that an owner allowed to a spender.
* approve should be called when allowed_[_spender] == 0. To decrement
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* Emits an Approval event.
* @param spender The address which will spend the funds.
* @param subtractedValue The amount of tokens to decrease the allowance by.
*/
function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) {
require(spender != address(0));
_allowed[msg.sender][spender] = _allowed[msg.sender][spender].sub(subtractedValue);
emit Approval(msg.sender, spender, _allowed[msg.sender][spender]);
return true;
}
/**
* @dev Transfer token for a specified addresses
* @param from The address to transfer from.
* @param to The address to transfer to.
* @param value The amount to be transferred.
*/
function _transfer(address from, address to, uint256 value) internal {
require(to != address(0));
_balances[from] = _balances[from].sub(value);
_balances[to] = _balances[to].add(value);
emit Transfer(from, to, value);
}
/**
* @dev Internal function that mints an amount of the token and assigns it to
* an account. This encapsulates the modification of balances such that the
* proper events are emitted.
* @param account The account that will receive the created tokens.
* @param value The amount that will be created.
*/
function _mint(address account, uint256 value) internal {
require(account != address(0));
_totalSupply = _totalSupply.add(value);
_balances[account] = _balances[account].add(value);
emit Transfer(address(0), account, value);
}
/**
* @dev Internal function that burns an amount of the token of a given
* account.
* @param account The account whose tokens will be burnt.
* @param value The amount that will be burnt.
*/
function _burn(address account, uint256 value) internal {
require(account != address(0));
_totalSupply = _totalSupply.sub(value);
_balances[account] = _balances[account].sub(value);
emit Transfer(account, address(0), value);
}
/**
* @dev Internal function that burns an amount of the token of a given
* account, deducting from the sender's allowance for said account. Uses the
* internal burn function.
* Emits an Approval event (reflecting the reduced allowance).
* @param account The account whose tokens will be burnt.
* @param value The amount that will be burnt.
*/
function _burnFrom(address account, uint256 value) internal {
_allowed[account][msg.sender] = _allowed[account][msg.sender].sub(value);
_burn(account, value);
emit Approval(account, msg.sender, _allowed[account][msg.sender]);
}
}
/**
* @title Burnable Token
* @dev Token that can be irreversibly burned (destroyed).
*/
contract ERC20Burnable is ERC20Pistachio {
bool private _burnableActive;
/**
* @dev Burns a specific amount of tokens.
* @param value The amount of token to be burned.
*/
function burn(uint256 value) public whenBurnableActive {
_burn(msg.sender, value);
}
/**
* @dev Burns a specific amount of tokens from the target address and decrements allowance
* @param from address The address which you want to send tokens from
* @param value uint256 The amount of token to be burned
*/
function burnFrom(address from, uint256 value) public whenBurnableActive {
_burnFrom(from, value);
}
/**
* @dev Options to activate or deactivate Burn ability
*/
function _setBurnableActive(bool _active) internal {
_burnableActive = _active;
}
modifier whenBurnableActive() {
require(_burnableActive);
_;
}
}
/**
* @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(account != address(0));
require(!has(role, account));
role.bearer[account] = true;
}
/**
* @dev remove an account's access to this role
*/
function remove(Role storage role, address account) internal {
require(account != address(0));
require(has(role, account));
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));
return role.bearer[account];
}
}
contract MinterRole {
using Roles for Roles.Role;
event MinterAdded(address indexed account);
event MinterRemoved(address indexed account);
Roles.Role private _minters;
constructor () internal {
_addMinter(msg.sender);
}
modifier onlyMinter() {
require(isMinter(msg.sender));
_;
}
function isMinter(address account) public view returns (bool) {
return _minters.has(account);
}
function addMinter(address account) public onlyMinter {
_addMinter(account);
}
function renounceMinter() public {
_removeMinter(msg.sender);
}
function _addMinter(address account) internal {
_minters.add(account);
emit MinterAdded(account);
}
function _removeMinter(address account) internal {
_minters.remove(account);
emit MinterRemoved(account);
}
}
/**
* @title ERC20Mintable
* @dev ERC20 minting logic
*/
contract ERC20Mintable is ERC20Pistachio, MinterRole {
bool private _mintableActive;
/**
* @dev Function to mint tokens
* @param to The address that will receive the minted tokens.
* @param value The amount of tokens to mint.
* @return A boolean that indicates if the operation was successful.
*/
function mint(address to, uint256 value) public onlyMinter whenMintableActive returns (bool) {
_mint(to, value);
return true;
}
/**
* @dev Options to activate or deactivate Burn ability
*/
function _setMintableActive(bool _active) internal {
_mintableActive = _active;
}
modifier whenMintableActive() {
require(_mintableActive);
_;
}
}
contract PauserRole {
using Roles for Roles.Role;
event PauserAdded(address indexed account);
event PauserRemoved(address indexed account);
Roles.Role private _pausers;
constructor () internal {
_addPauser(msg.sender);
}
modifier onlyPauser() {
require(isPauser(msg.sender));
_;
}
function isPauser(address account) public view returns (bool) {
return _pausers.has(account);
}
function addPauser(address account) public onlyPauser {
_addPauser(account);
}
function renouncePauser() public {
_removePauser(msg.sender);
}
function _addPauser(address account) internal {
_pausers.add(account);
emit PauserAdded(account);
}
function _removePauser(address account) internal {
_pausers.remove(account);
emit PauserRemoved(account);
}
}
/**
* @title Pausable
* @dev Base contract which allows children to implement an emergency stop mechanism.
*/
contract Pausable is PauserRole {
event Paused(address account);
event Unpaused(address account);
bool private _pausableActive;
bool private _paused;
constructor () internal {
_paused = false;
}
/**
* @return true if the contract is paused, false otherwise.
*/
function paused() public view returns (bool) {
return _paused;
}
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!_paused);
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(_paused);
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() public onlyPauser whenNotPaused whenPausableActive {
_paused = true;
emit Paused(msg.sender);
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() public onlyPauser whenPaused whenPausableActive {
_paused = false;
emit Unpaused(msg.sender);
}
/**
* @dev Options to activate or deactivate Pausable ability
*/
function _setPausableActive(bool _active) internal {
_pausableActive = _active;
}
modifier whenPausableActive() {
require(_pausableActive);
_;
}
}
/**
* @title Advanced ERC20 token
*
* @dev Implementation of the basic standard token plus mint and burn public functions.
*
* Version 2. This version delegates the minter and pauser renounce to parent-factory contract
* that allows ICOs to be minter for token selling
*
*/
contract ERC20Chocolate is ERC20Pistachio, ERC20Burnable, ERC20Mintable, Pausable {
// maximum capital, if defined > 0
uint256 private _cap;
constructor (
address initialAccount, string memory _tokenSymbol, string memory _tokenName, uint256 initialBalance, uint256 cap,
bool _burnableOption, bool _mintableOption, bool _pausableOption
) public 
ERC20Pistachio(initialAccount, _tokenSymbol, _tokenName, initialBalance) {
// we must add customer account as the first minter
addMinter(initialAccount);
// add customer as pauser
addPauser(initialAccount);
if (cap > 0) {
_cap = cap; // maximum capitalization limited
} else {
_cap = 0; // unlimited capitalization
}
// activate or deactivate options
_setBurnableActive(_burnableOption);
_setMintableActive(_mintableOption);
_setPausableActive(_pausableOption);
}
/**
* @return the cap for the token minting.
*/
function cap() public view returns (uint256) {
return _cap;
}
/**
* limit the mint to a maximum cap only if cap is defined
*/
function _mint(address account, uint256 value) internal {
if (_cap > 0) {
require(totalSupply().add(value) <= _cap);
}
super._mint(account, value);
}
/**
* Pausable options
*/
function transfer(address to, uint256 value) public whenNotPaused returns (bool) {
return super.transfer(to, value);
}
function transferFrom(address from,address to, uint256 value) public whenNotPaused returns (bool) {
return super.transferFrom(from, to, value);
}
function approve(address spender, uint256 value) public whenNotPaused returns (bool) {
return super.approve(spender, value);
}
function increaseAllowance(address spender, uint addedValue) public whenNotPaused returns (bool success) {
return super.increaseAllowance(spender, addedValue);
}
function decreaseAllowance(address spender, uint subtractedValue) public whenNotPaused returns (bool success) {
return super.decreaseAllowance(spender, subtractedValue);
}
}

/** ██╗ ██╗██████╗ ███████╗███╗ ███╗ █████╗ ██████╗ ████████╗ ██████╗ ██████╗ ███╗ ██╗████████╗██████╗ █████╗ ██████╗████████╗███████╗ ██████╗ ██████╗ ███╗ ███╗ ██║ ██║██╔══██╗██╔════╝████╗ ████║██╔══██╗██╔══██╗╚══██╔══╝██╔════╝██╔═══██╗████╗ ██║╚══██╔══╝██╔══██╗██╔══██╗██╔════╝╚══██╔══╝██╔════╝ ██╔════╝██╔═══██╗████╗ ████║ ██║ █╗ ██║██████╔╝███████╗██╔████╔██║███████║██████╔╝ ██║ ██║ ██║ ██║██╔██╗ ██║ ██║ ██████╔╝███████║██║ ██║ ███████╗ ██║ ██║ ██║██╔████╔██║ ██║███╗██║██╔═══╝ ╚════██║██║╚██╔╝██║██╔══██║██╔══██╗ ██║ ██║ ██║ ██║██║╚██╗██║ ██║ ██╔══██╗██╔══██║██║ ██║ ╚════██║ ██║ ██║ ██║██║╚██╔╝██║ ╚███╔███╔╝██║ ███████║██║ ╚═╝ ██║██║ ██║██║ ██║ ██║ ╚██████╗╚██████╔╝██║ ╚████║ ██║ ██║ ██║██║ ██║╚██████╗ ██║ ███████║██╗╚██████╗╚██████╔╝██║ ╚═╝ ██║ ╚══╝╚══╝ ╚═╝ ╚══════╝╚═╝ ╚═╝╚═╝ ╚═╝╚═╝ ╚═╝ ╚═╝ ╚═════╝ ╚═════╝ ╚═╝ ╚═══╝ ╚═╝ ╚═╝ ╚═╝╚═╝ ╚═╝ ╚═════╝ ╚═╝ ╚══════╝╚═╝ ╚═════╝ ╚═════╝ ╚═╝ ╚═╝ Blockchain Made Easy https://wpsmartcontracts.com/ */ pragma solidity ^0.5.7; /** * @title SafeMath * @dev Math operations with safety checks that revert on error */ library SafeMath { int256 constant private INT256_MIN = -2**255; /** * @dev Multiplies two unsigned integers, reverts on 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-solidity/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b); return c; } /** * @dev Multiplies two signed integers, reverts on overflow. */ function mul(int256 a, int256 b) internal pure returns (int256) { // 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-solidity/pull/522 if (a == 0) { return 0; } require(!(a == -1 && b == INT256_MIN)); // This is the only case of overflow not detected by the check below int256 c = a * b; require(c / a == b); return c; } /** * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Integer division of two signed integers truncating the quotient, reverts on division by zero. */ function div(int256 a, int256 b) internal pure returns (int256) { require(b != 0); // Solidity only automatically asserts when dividing by 0 require(!(b == -1 && a == INT256_MIN)); // This is the only case of overflow int256 c = a / b; return c; } /** * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a); uint256 c = a - b; return c; } /** * @dev Subtracts two signed integers, reverts on overflow. */ function sub(int256 a, int256 b) internal pure returns (int256) { int256 c = a - b; require((b >= 0 && c <= a) || (b < 0 && c > a)); return c; } /** * @dev Adds two unsigned integers, reverts on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a); return c; } /** * @dev Adds two signed integers, reverts on overflow. */ function add(int256 a, int256 b) internal pure returns (int256) { int256 c = a + b; require((b >= 0 && c >= a) || (b < 0 && c < a)); return c; } /** * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo), * reverts when dividing by zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0); return a % b; } } /** * @title ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ interface IERC20 { function totalSupply() external view returns (uint256); function balanceOf(address who) external view returns (uint256); function allowance(address owner, address spender) external view returns (uint256); function transfer(address to, uint256 value) external returns (bool); function approve(address spender, uint256 value) external returns (bool); function transferFrom(address from, address to, uint256 value) external returns (bool); event Transfer(address indexed from, address indexed to, uint256 value); event Approval(address indexed owner, address indexed spender, uint256 value); } contract ERC20Pistachio is IERC20 { using SafeMath for uint256; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowed; uint256 private _totalSupply; /** * @dev Public parameters to define the token */ // Token symbol (short) string public symbol; // Token name (Long) string public name; // Decimals (18 maximum) uint8 public decimals; /** * @dev Public functions to make the contract accesible */ constructor (address initialAccount, string memory _tokenSymbol, string memory _tokenName, uint256 initialBalance) public { // Initialize Contract Parameters symbol = _tokenSymbol; name = _tokenName; decimals = 18; // default decimals is going to be 18 always _mint(initialAccount, initialBalance); } /** * @dev Total number of tokens in existence */ function totalSupply() public view returns (uint256) { return _totalSupply; } /** * @dev Gets the balance of the specified address. * @param owner The address to query the balance of. * @return An uint256 representing the amount owned by the passed address. */ function balanceOf(address owner) public view returns (uint256) { return _balances[owner]; } /** * @dev Function to check the amount of tokens that an owner allowed to a spender. * @param owner address The address which owns the funds. * @param spender address The address which will spend the funds. * @return A uint256 specifying the amount of tokens still available for the spender. */ function allowance(address owner, address spender) public view returns (uint256) { return _allowed[owner][spender]; } /** * @dev Transfer token for a specified address * @param to The address to transfer to. * @param value The amount to be transferred. */ function transfer(address to, uint256 value) public returns (bool) { _transfer(msg.sender, to, value); return true; } /** * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * 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 * @param spender The address which will spend the funds. * @param value The amount of tokens to be spent. */ function approve(address spender, uint256 value) public returns (bool) { require(spender != address(0)); _allowed[msg.sender][spender] = value; emit Approval(msg.sender, spender, value); return true; } /** * @dev Transfer tokens from one address to another. * Note that while this function emits an Approval event, this is not required as per the specification, * and other compliant implementations may not emit the event. * @param from address The address which you want to send tokens from * @param to address The address which you want to transfer to * @param value uint256 the amount of tokens to be transferred */ function transferFrom(address from, address to, uint256 value) public returns (bool) { _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value); _transfer(from, to, value); emit Approval(from, msg.sender, _allowed[from][msg.sender]); return true; } /** * @dev Increase the amount of tokens that an owner allowed to a spender. * approve should be called when allowed_[_spender] == 0. To increment * allowed value is better to use this function to avoid 2 calls (and wait until * the first transaction is mined) * From MonolithDAO Token.sol * Emits an Approval event. * @param spender The address which will spend the funds. * @param addedValue The amount of tokens to increase the allowance by. */ function increaseAllowance(address spender, uint256 addedValue) public returns (bool) { require(spender != address(0)); _allowed[msg.sender][spender] = _allowed[msg.sender][spender].add(addedValue); emit Approval(msg.sender, spender, _allowed[msg.sender][spender]); return true; } /** * @dev Decrease the amount of tokens that an owner allowed to a spender. * approve should be called when allowed_[_spender] == 0. To decrement * allowed value is better to use this function to avoid 2 calls (and wait until * the first transaction is mined) * From MonolithDAO Token.sol * Emits an Approval event. * @param spender The address which will spend the funds. * @param subtractedValue The amount of tokens to decrease the allowance by. */ function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) { require(spender != address(0)); _allowed[msg.sender][spender] = _allowed[msg.sender][spender].sub(subtractedValue); emit Approval(msg.sender, spender, _allowed[msg.sender][spender]); return true; } /** * @dev Transfer token for a specified addresses * @param from The address to transfer from. * @param to The address to transfer to. * @param value The amount to be transferred. */ function _transfer(address from, address to, uint256 value) internal { require(to != address(0)); _balances[from] = _balances[from].sub(value); _balances[to] = _balances[to].add(value); emit Transfer(from, to, value); } /** * @dev Internal function that mints an amount of the token and assigns it to * an account. This encapsulates the modification of balances such that the * proper events are emitted. * @param account The account that will receive the created tokens. * @param value The amount that will be created. */ function _mint(address account, uint256 value) internal { require(account != address(0)); _totalSupply = _totalSupply.add(value); _balances[account] = _balances[account].add(value); emit Transfer(address(0), account, value); } /** * @dev Internal function that burns an amount of the token of a given * account. * @param account The account whose tokens will be burnt. * @param value The amount that will be burnt. */ function _burn(address account, uint256 value) internal { require(account != address(0)); _totalSupply = _totalSupply.sub(value); _balances[account] = _balances[account].sub(value); emit Transfer(account, address(0), value); } /** * @dev Internal function that burns an amount of the token of a given * account, deducting from the sender's allowance for said account. Uses the * internal burn function. * Emits an Approval event (reflecting the reduced allowance). * @param account The account whose tokens will be burnt. * @param value The amount that will be burnt. */ function _burnFrom(address account, uint256 value) internal { _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(value); _burn(account, value); emit Approval(account, msg.sender, _allowed[account][msg.sender]); } } /** * @title Burnable Token * @dev Token that can be irreversibly burned (destroyed). */ contract ERC20Burnable is ERC20Pistachio { bool private _burnableActive; /** * @dev Burns a specific amount of tokens. * @param value The amount of token to be burned. */ function burn(uint256 value) public whenBurnableActive { _burn(msg.sender, value); } /** * @dev Burns a specific amount of tokens from the target address and decrements allowance * @param from address The address which you want to send tokens from * @param value uint256 The amount of token to be burned */ function burnFrom(address from, uint256 value) public whenBurnableActive { _burnFrom(from, value); } /** * @dev Options to activate or deactivate Burn ability */ function _setBurnableActive(bool _active) internal { _burnableActive = _active; } modifier whenBurnableActive() { require(_burnableActive); _; } } /** * @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(account != address(0)); require(!has(role, account)); role.bearer[account] = true; } /** * @dev remove an account's access to this role */ function remove(Role storage role, address account) internal { require(account != address(0)); require(has(role, account)); 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)); return role.bearer[account]; } } contract MinterRole { using Roles for Roles.Role; event MinterAdded(address indexed account); event MinterRemoved(address indexed account); Roles.Role private _minters; constructor () internal { _addMinter(msg.sender); } modifier onlyMinter() { require(isMinter(msg.sender)); _; } function isMinter(address account) public view returns (bool) { return _minters.has(account); } function addMinter(address account) public onlyMinter { _addMinter(account); } function renounceMinter() public { _removeMinter(msg.sender); } function _addMinter(address account) internal { _minters.add(account); emit MinterAdded(account); } function _removeMinter(address account) internal { _minters.remove(account); emit MinterRemoved(account); } } /** * @title ERC20Mintable * @dev ERC20 minting logic */ contract ERC20Mintable is ERC20Pistachio, MinterRole { bool private _mintableActive; /** * @dev Function to mint tokens * @param to The address that will receive the minted tokens. * @param value The amount of tokens to mint. * @return A boolean that indicates if the operation was successful. */ function mint(address to, uint256 value) public onlyMinter whenMintableActive returns (bool) { _mint(to, value); return true; } /** * @dev Options to activate or deactivate Burn ability */ function _setMintableActive(bool _active) internal { _mintableActive = _active; } modifier whenMintableActive() { require(_mintableActive); _; } } contract PauserRole { using Roles for Roles.Role; event PauserAdded(address indexed account); event PauserRemoved(address indexed account); Roles.Role private _pausers; constructor () internal { _addPauser(msg.sender); } modifier onlyPauser() { require(isPauser(msg.sender)); _; } function isPauser(address account) public view returns (bool) { return _pausers.has(account); } function addPauser(address account) public onlyPauser { _addPauser(account); } function renouncePauser() public { _removePauser(msg.sender); } function _addPauser(address account) internal { _pausers.add(account); emit PauserAdded(account); } function _removePauser(address account) internal { _pausers.remove(account); emit PauserRemoved(account); } } /** * @title Pausable * @dev Base contract which allows children to implement an emergency stop mechanism. */ contract Pausable is PauserRole { event Paused(address account); event Unpaused(address account); bool private _pausableActive; bool private _paused; constructor () internal { _paused = false; } /** * @return true if the contract is paused, false otherwise. */ function paused() public view returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!_paused); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(_paused); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() public onlyPauser whenNotPaused whenPausableActive { _paused = true; emit Paused(msg.sender); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() public onlyPauser whenPaused whenPausableActive { _paused = false; emit Unpaused(msg.sender); } /** * @dev Options to activate or deactivate Pausable ability */ function _setPausableActive(bool _active) internal { _pausableActive = _active; } modifier whenPausableActive() { require(_pausableActive); _; } } /** * @title Advanced ERC20 token * * @dev Implementation of the basic standard token plus mint and burn public functions. * * Version 2. This version delegates the minter and pauser renounce to parent-factory contract * that allows ICOs to be minter for token selling * */ contract ERC20Chocolate is ERC20Pistachio, ERC20Burnable, ERC20Mintable, Pausable { // maximum capital, if defined > 0 uint256 private _cap; constructor ( address initialAccount, string memory _tokenSymbol, string memory _tokenName, uint256 initialBalance, uint256 cap, bool _burnableOption, bool _mintableOption, bool _pausableOption ) public ERC20Pistachio(initialAccount, _tokenSymbol, _tokenName, initialBalance) { // we must add customer account as the first minter addMinter(initialAccount); // add customer as pauser addPauser(initialAccount); if (cap > 0) { _cap = cap; // maximum capitalization limited } else { _cap = 0; // unlimited capitalization } // activate or deactivate options _setBurnableActive(_burnableOption); _setMintableActive(_mintableOption); _setPausableActive(_pausableOption); } /** * @return the cap for the token minting. */ function cap() public view returns (uint256) { return _cap; } /** * limit the mint to a maximum cap only if cap is defined */ function _mint(address account, uint256 value) internal { if (_cap > 0) { require(totalSupply().add(value) <= _cap); } super._mint(account, value); } /** * Pausable options */ function transfer(address to, uint256 value) public whenNotPaused returns (bool) { return super.transfer(to, value); } function transferFrom(address from,address to, uint256 value) public whenNotPaused returns (bool) { return super.transferFrom(from, to, value); } function approve(address spender, uint256 value) public whenNotPaused returns (bool) { return super.approve(spender, value); } function increaseAllowance(address spender, uint addedValue) public whenNotPaused returns (bool success) { return super.increaseAllowance(spender, addedValue); } function decreaseAllowance(address spender, uint subtractedValue) public whenNotPaused returns (bool success) { return super.decreaseAllowance(spender, subtractedValue); } }

[
{
"constant": true,
"inputs": [],
"name": "name",
"outputs": [
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "spender",
"type": "address"
},
{
"name": "value",
"type": "uint256"
}
],
"name": "approve",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "totalSupply",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "from",
"type": "address"
},
{
"name": "to",
"type": "address"
},
{
"name": "value",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "decimals",
"outputs": [
{
"name": "",
"type": "uint8"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "cap",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "spender",
"type": "address"
},
{
"name": "addedValue",
"type": "uint256"
}
],
"name": "increaseAllowance",
"outputs": [
{
"name": "success",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [],
"name": "unpause",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "to",
"type": "address"
},
{
"name": "value",
"type": "uint256"
}
],
"name": "mint",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "value",
"type": "uint256"
}
],
"name": "burn",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "account",
"type": "address"
}
],
"name": "isPauser",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "paused",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [],
"name": "renouncePauser",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "owner",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "from",
"type": "address"
},
{
"name": "value",
"type": "uint256"
}
],
"name": "burnFrom",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "account",
"type": "address"
}
],
"name": "addPauser",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [],
"name": "pause",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "symbol",
"outputs": [
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "account",
"type": "address"
}
],
"name": "addMinter",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [],
"name": "renounceMinter",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "spender",
"type": "address"
},
{
"name": "subtractedValue",
"type": "uint256"
}
],
"name": "decreaseAllowance",
"outputs": [
{
"name": "success",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "to",
"type": "address"
},
{
"name": "value",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "account",
"type": "address"
}
],
"name": "isMinter",
"outputs": [
{
"name": "",
"type": "bool"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "owner",
"type": "address"
},
{
"name": "spender",
"type": "address"
}
],
"name": "allowance",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"inputs": [
{
"name": "initialAccount",
"type": "address"
},
{
"name": "_tokenSymbol",
"type": "string"
},
{
"name": "_tokenName",
"type": "string"
},
{
"name": "initialBalance",
"type": "uint256"
},
{
"name": "cap",
"type": "uint256"
},
{
"name": "_burnableOption",
"type": "bool"
},
{
"name": "_mintableOption",
"type": "bool"
},
{
"name": "_pausableOption",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "constructor"
},
{
"anonymous": false,
"inputs": [
{
"indexed": false,
"name": "account",
"type": "address"
}
],
"name": "Paused",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": false,
"name": "account",
"type": "address"
}
],
"name": "Unpaused",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "account",
"type": "address"
}
],
"name": "PauserAdded",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "account",
"type": "address"
}
],
"name": "PauserRemoved",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "account",
"type": "address"
}
],
"name": "MinterAdded",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "account",
"type": "address"
}
],
"name": "MinterRemoved",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "from",
"type": "address"
},
{
"indexed": true,
"name": "to",
"type": "address"
},
{
"indexed": false,
"name": "value",
"type": "uint256"
}
],
"name": "Transfer",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "owner",
"type": "address"
},
{
"indexed": true,
"name": "spender",
"type": "address"
},
{
"indexed": false,
"name": "value",
"type": "uint256"
}
],
"name": "Approval",
"type": "event"
}
]

[ { "constant": true, "inputs": [], "name": "name", "outputs": [ { "name": "", "type": "string" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "spender", "type": "address" }, { "name": "value", "type": "uint256" } ], "name": "approve", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "totalSupply", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "from", "type": "address" }, { "name": "to", "type": "address" }, { "name": "value", "type": "uint256" } ], "name": "transferFrom", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "decimals", "outputs": [ { "name": "", "type": "uint8" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "cap", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "spender", "type": "address" }, { "name": "addedValue", "type": "uint256" } ], "name": "increaseAllowance", "outputs": [ { "name": "success", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [], "name": "unpause", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "to", "type": "address" }, { "name": "value", "type": "uint256" } ], "name": "mint", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "value", "type": "uint256" } ], "name": "burn", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [ { "name": "account", "type": "address" } ], "name": "isPauser", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [], "name": "paused", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [], "name": "renouncePauser", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [ { "name": "owner", "type": "address" } ], "name": "balanceOf", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "from", "type": "address" }, { "name": "value", "type": "uint256" } ], "name": "burnFrom", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "account", "type": "address" } ], "name": "addPauser", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [], "name": "pause", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [], "name": "symbol", "outputs": [ { "name": "", "type": "string" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": false, "inputs": [ { "name": "account", "type": "address" } ], "name": "addMinter", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [], "name": "renounceMinter", "outputs": [], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "spender", "type": "address" }, { "name": "subtractedValue", "type": "uint256" } ], "name": "decreaseAllowance", "outputs": [ { "name": "success", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": false, "inputs": [ { "name": "to", "type": "address" }, { "name": "value", "type": "uint256" } ], "name": "transfer", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "function" }, { "constant": true, "inputs": [ { "name": "account", "type": "address" } ], "name": "isMinter", "outputs": [ { "name": "", "type": "bool" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "constant": true, "inputs": [ { "name": "owner", "type": "address" }, { "name": "spender", "type": "address" } ], "name": "allowance", "outputs": [ { "name": "", "type": "uint256" } ], "payable": false, "stateMutability": "view", "type": "function" }, { "inputs": [ { "name": "initialAccount", "type": "address" }, { "name": "_tokenSymbol", "type": "string" }, { "name": "_tokenName", "type": "string" }, { "name": "initialBalance", "type": "uint256" }, { "name": "cap", "type": "uint256" }, { "name": "_burnableOption", "type": "bool" }, { "name": "_mintableOption", "type": "bool" }, { "name": "_pausableOption", "type": "bool" } ], "payable": false, "stateMutability": "nonpayable", "type": "constructor" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "account", "type": "address" } ], "name": "Paused", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": false, "name": "account", "type": "address" } ], "name": "Unpaused", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "account", "type": "address" } ], "name": "PauserAdded", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "account", "type": "address" } ], "name": "PauserRemoved", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "account", "type": "address" } ], "name": "MinterAdded", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "account", "type": "address" } ], "name": "MinterRemoved", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "from", "type": "address" }, { "indexed": true, "name": "to", "type": "address" }, { "indexed": false, "name": "value", "type": "uint256" } ], "name": "Transfer", "type": "event" }, { "anonymous": false, "inputs": [ { "indexed": true, "name": "owner", "type": "address" }, { "indexed": true, "name": "spender", "type": "address" }, { "indexed": false, "name": "value", "type": "uint256" } ], "name": "Approval", "type": "event" } ]