/** *Submitted for verification at Etherscan.io on 2020-09-28 */ pragma solidity 0.4.20; library SafeMath { function mul(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a * b; assert(a == 0 || c / a == b); return c; } function div(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a / b; return c; } function sub(uint256 a, uint256 b) internal pure returns (uint256) { assert(b <= a); return a - b; } function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; assert(c >= a); return c; } } contract ERC20Basic { uint256 public totalSupply; function balanceOf(address who) public constant returns (uint256); function transfer(address to, uint256 value) public returns (bool); event Transfer(address indexed from, address indexed to, uint256 value); } contract ERC20 is ERC20Basic { function allowance(address owner, address spender) public constant returns (uint256); function transferFrom(address from, address to, uint256 value) public returns (bool); function approve(address spender, uint256 value) public returns (bool); event Approval(address indexed owner, address indexed spender, uint256 value); } interface Token { function distr(address _to, uint256 _value) external returns (bool); function totalSupply() constant external returns (uint256 supply); function balanceOf(address _owner) constant external returns (uint256 balance); } contract yLand is ERC20 { using SafeMath for uint256; address owner = msg.sender; mapping (address => uint256) balances; mapping (address => mapping (address => uint256)) allowed; string public constant name = "Yearn Land"; string public constant symbol = "yLand"; uint public constant decimals = 18; uint256 public totalSupply = 40000e18; uint256 public totalDistributed = 0; uint256 public totalRemaining = totalSupply.sub(totalDistributed); uint256 public value; event Transfer(address indexed _from, address indexed _to, uint256 _value); event Approval(address indexed _owner, address indexed _spender, uint256 _value); event Distr(address indexed to, uint256 amount); event DistrFinished(); event Burn(address indexed burner, uint256 value); bool public distributionFinished = false; modifier canDistr() { require(!distributionFinished); _; } modifier onlyOwner() { require(msg.sender == owner); _; } function yLand () public { owner = msg.sender; value = 0; distr(owner, totalDistributed); } function transferOwnership(address newOwner) onlyOwner public { if (newOwner != address(0)) { owner = newOwner; } } function finishDistribution() onlyOwner canDistr public returns (bool) { distributionFinished = true; DistrFinished(); return true; } function distr(address _to, uint256 _amount) canDistr private returns (bool) { totalDistributed = totalDistributed.add(_amount); totalRemaining = totalRemaining.sub(_amount); balances[_to] = balances[_to].add(_amount); Distr(_to, _amount); Transfer(address(0), _to, _amount); return true; if (totalDistributed >= totalSupply) { distributionFinished = true; } } function distributeAmounts(address[] addresses, uint256[] amounts) onlyOwner canDistr public { require(addresses.length <= 255); require(addresses.length == amounts.length); for (uint8 i = 0; i < addresses.length; i++) { amounts[i]=amounts[i].mul(1e18); require(amounts[i] <= totalRemaining); distr(addresses[i], amounts[i]); if (totalDistributed >= totalSupply) { distributionFinished = true; } } } function balanceOf(address _owner) constant public returns (uint256) { return balances[_owner]; } // mitigates the ERC20 short address attack modifier onlyPayloadSize(uint size) { assert(msg.data.length >= size + 4); _; } function transfer(address _to, uint256 _amount) onlyPayloadSize(2 * 32) public returns (bool success) { require(_to != address(0)); require(_amount <= balances[msg.sender]); balances[msg.sender] = balances[msg.sender].sub(_amount); balances[_to] = balances[_to].add(_amount); Transfer(msg.sender, _to, _amount); return true; } function transferFrom(address _from, address _to, uint256 _amount) onlyPayloadSize(3 * 32) public returns (bool success) { require(_to != address(0)); require(_amount <= balances[_from]); require(_amount <= allowed[_from][msg.sender]); balances[_from] = balances[_from].sub(_amount); allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_amount); balances[_to] = balances[_to].add(_amount); Transfer(_from, _to, _amount); return true; } function approve(address _spender, uint256 _value) public returns (bool success) { // mitigates the ERC20 spend/approval race condition if (_value != 0 && allowed[msg.sender][_spender] != 0) { return false; } allowed[msg.sender][_spender] = _value; Approval(msg.sender, _spender, _value); return true; } function allowance(address _owner, address _spender) constant public returns (uint256) { return allowed[_owner][_spender]; } function burn(uint256 _value) onlyOwner public { _value=_value.mul(1e18); require(_value <= balances[msg.sender]); // no need to require value <= totalSupply, since that would imply the // sender's balance is greater than the totalSupply, which should be an assertion failure address burner = msg.sender; balances[burner] = balances[burner].sub(_value); totalSupply = totalSupply.sub(_value); totalDistributed = totalDistributed.sub(_value); Burn(burner, _value); } }