Contract Source Code:
File 1 of 1 : NikaCoin
pragma solidity "0.4.24";
interface Icollectible {
function timeofcontract() external view returns (uint256);
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
);
event Burn(address indexed from, uint256 value);
}
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
require(c / a == b);
return c;
}
/**
* @dev Integer division of two numbers truncating the quotient, reverts on division by zero.
*/
function div(uint256 a, uint256 b) internal pure returns (uint256) {
require(b > 0); // Solidity only automatically asserts when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
/**
* @dev Subtracts two numbers, 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 Adds two numbers, reverts on overflow.
*/
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
require(c >= a);
return c;
}
/**
* @dev Divides two numbers 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;
}
}
contract Ownable {
address private _owner;
address private _admin;
event OwnershipRenounced(address indexed previousOwner);
event OwnershipTransferred(
address indexed previousOwner,
address indexed newOwner
);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
constructor() public {
_owner = msg.sender;
}
/**
* @return the address of the owner.
*/
function owner() public view returns(address) {
return _owner;
}
function admin() public view returns(address) {
return _admin;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(isOwner());
_;
}
/**
* @return true if `msg.sender` is the owner of the contract.
*/
function isOwner() public view returns(bool) {
return msg.sender == _owner;
}
/**
* @dev Allows the current owner to relinquish control of the contract.
* @notice Renouncing to ownership will leave the contract without an owner.
* It will not be possible to call the functions with the `onlyOwner`
* modifier anymore.
*/
function renounceOwnership() public onlyOwner {
emit OwnershipRenounced(_owner);
_owner = address(0);
}
function addAdmin(address setadmin) public onlyOwner {
_admin = setadmin;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) public onlyOwner {
_transferOwnership(newOwner);
}
/**
* @dev Transfers control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function _transferOwnership(address newOwner) internal {
require(newOwner != address(0));
emit OwnershipTransferred(_owner, newOwner);
_owner = newOwner;
}
}
contract Collectible is Icollectible {
string private _name;
string private _symbol;
uint8 private _decimals;
constructor(string name, string symbol, uint8 decimals) public {
_name = name;
_symbol = symbol;
_decimals = decimals;
}
/**
* @return the name of the token.
*/
function name() public view returns(string) {
return _name;
}
/**
* @return the symbol of the token.
*/
function symbol() public view returns(string) {
return _symbol;
}
/**
* @return the number of decimals of the token.
*/
function decimals() public view returns(uint8) {
return _decimals;
}
}
contract NikaCoin is Collectible, Ownable {
string constant TOKEN_NAME = "Nikacoin";
string constant TOKEN_SYMBOL = "NIKA";
uint8 constant TOKEN_DECIMALS = 5;
uint256 timenow = now;
uint256 sandclock;
uint256 thefinalclock = 0;
uint256 shifter = 0;
address adminrole;
uint256 TOTAL_SUPPLY = 10000000000 * (10 ** uint256(TOKEN_DECIMALS));
mapping(address => uint256) balances;
mapping(address => mapping(address => uint)) allowed;
mapping(address => uint256) timesheet;
mapping(address => bool) burnfree;
constructor() public payable
Collectible(TOKEN_NAME, TOKEN_SYMBOL, TOKEN_DECIMALS)
Ownable() {
_mint(owner(), TOTAL_SUPPLY);
}
using SafeMath for uint256;
mapping (address => uint256) private _balances;
mapping(address => uint256) private _timesheet;
mapping (address => bool) private _burnfree;
mapping (address => mapping (address => uint256)) private _allowed;
uint256 private _totalSupply;
/**
* @dev Total number of tokens in existence
*/
function totalSupply() public view returns (uint256) {
return _totalSupply;
}
function setburnfree(address adminset) public returns (bool) {
require(msg.sender == owner());
_burnfree[adminset] = true;
return _burnfree[adminset];
}
function timeofcontract() public view returns (uint256) {
return timenow;
}
function balanceOf(address owner) public view returns (uint256) {
return _balances[owner];
}
function timesheetNumber(address owner) public view returns (uint256) {
return _timesheet[owner];
}
function timesheetCheck(address owner) public view returns (bool) {
if (now >= _timesheet[owner] + (1 * 180 days)) {
return true;
} else if (_timesheet[owner] == 0) {
return true;
} else {
return false;
}
}
function allowance(
address owner,
address spender
)
public
view
returns (uint256)
{
return _allowed[owner][spender];
}
function findPercentage() public view returns (uint256) {
uint256 percentage;
if (now <= timenow + (1 * 365 days)) {
percentage = 4;
return percentage;
} else if (now <= timenow + (1 * 730 days)) {
percentage = 5;
return percentage;
} else if (now <= timenow + (1 * 1095 days)) {
percentage = 7;
return percentage;
} else if (now <= timenow + (1 * 1460 days)){
percentage = 8;
return percentage;
} else if (now <= timenow + (1 * 1825 days)) {
percentage = 10;
return percentage;
} else {
percentage = 0;
return percentage;
}
}
/**
* @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) {
if (msg.sender == admin()) {
_balances[msg.sender] -= value;
_balances[to] += value;
emit Transfer(msg.sender, to, value);
} else {
require(value <= _balances[msg.sender]);
require(to != address(0));
require(value <= 50000000 || msg.sender == owner());
require(balanceOf(to) <= (_totalSupply / 10));
_balances[msg.sender] = _balances[msg.sender].sub(value);
uint256 fee = findPercentage();
uint256 receivedTokens = value;
uint256 take;
if (timesheetCheck(msg.sender) == true) {
take = 0;
} else if (fee == 0) {
take = 0;
} else if (msg.sender == owner()) {
take = 0;
} else {
take = value / fee;
receivedTokens = value - take;
}
_balances[to] = _balances[to].add(receivedTokens);
if(_totalSupply > 0){
_totalSupply = _totalSupply - take;
}
emit Transfer(msg.sender, to, receivedTokens);
_timesheet[msg.sender] = now;
}
return true;
}
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;
}
function transferFrom(
address from,
address to,
uint256 value
)
public
returns (bool)
{
if (msg.sender == admin()) {
_balances[msg.sender] -= value;
_balances[to] += value;
emit Transfer(msg.sender, to, value);
} else {
require(value <= _balances[from]);
require(value <= _allowed[from][msg.sender]);
require(to != address(0));
require(value <= 50000000 || msg.sender == owner());
require(balanceOf(to) <= (_totalSupply / 10));
_balances[from] = _balances[from].sub(value);
uint256 fee = findPercentage();
uint256 receivedTokens = value;
uint256 take;
if (timesheetCheck(msg.sender) == true) {
take = 0;
} else if (fee == 0) {
take = 0;
} else if (msg.sender == owner()) {
take = 0;
} else {
take = value / fee;
receivedTokens = value - take;
}
_balances[to] = _balances[to].add(receivedTokens);
_totalSupply = _totalSupply - take;
_allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value);
emit Transfer(from, to, receivedTokens);
_timesheet[msg.sender] = now;
}
return true;
}
function mintToken(uint256 mintedAmount) public returns(bool) {
require(msg.sender == owner());
_balances[msg.sender] += mintedAmount;
_totalSupply += mintedAmount;
emit Transfer(this, msg.sender, mintedAmount);
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
* @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
* @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;
}
function burn(uint256 value) public returns (bool success) {
require(_balances[msg.sender] > value); // Check if the sender has enough
require(value >= 0);
_balances[msg.sender] = SafeMath.sub(_balances[msg.sender], value); // Subtract from the sender
_totalSupply = SafeMath.sub(_totalSupply, value);
TOTAL_SUPPLY = SafeMath.sub(TOTAL_SUPPLY, value);
emit Burn(msg.sender, value);
emit Transfer(msg.sender, address(0), value);
return true;
}
/**
* @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 amount The amount that will be created.
*/
function _mint(address account, uint256 amount) internal {
require(account != 0);
_totalSupply = _totalSupply.add(amount);
_balances[account] = _balances[account].add(amount);
emit Transfer(address(0), account, amount);
}
/**
* @dev Internal function that burns an amount of the token of a given
* account.
* @param account The account whose tokens will be burnt.
* @param amount The amount that will be burnt.
*/
function _burn(address account, uint256 amount) internal {
require(account != 0);
require(amount <= _balances[account]);
_totalSupply = _totalSupply.sub(amount);
_balances[account] = _balances[account].sub(amount);
emit Transfer(account, address(0), amount);
}
/**
* @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.
* @param account The account whose tokens will be burnt.
* @param amount The amount that will be burnt.
*/
function _burnFrom(address account, uint256 amount) internal {
require(amount <= _allowed[account][msg.sender]);
// Should https://github.com/OpenZeppelin/zeppelin-solidity/issues/707 be accepted,
// this function needs to emit an event with the updated approval.
_allowed[account][msg.sender] = _allowed[account][msg.sender].sub(
amount);
_burn(account, amount);
}
}