Unicorns ERC-20 token deployed by avsa (Alex Van de Sande) in Feb 2016. First of eleven Unicorns deployments, deployed 70 seconds before 0x1f75.
Token Information
Key Facts
Source Verified
Source reconstructed from bytecode analysis. All code blocks match exactly (same block multiset after normalizing jump destinations). Compiler: native C++ Solidity v0.1.1 with optimizer ON. Key features: overflow checks in transfer and transferFrom, single Transfer event in mintToken, approve returns bool with no explicit return, transferFrom emits Transfer(msg.sender,_to,_value). Instances A and C are bytecode-identical; Instance B has same source but different optimizer layout. Bytecode identical to 0x1f75047233517dcf67970d9e3c3bb385cb647f30.
Historian Categories
Heuristic Analysis
The following characteristics were detected through bytecode analysis and may not be accurate.
Frontier Era
The initial release of Ethereum. A bare-bones implementation for technical users.
Bytecode Overview
Verified Source Available
This contract has verified source code.
View Verification ProofShow source code (Solidity)
contract MyToken {
address public owner;
string public name;
string public symbol;
uint8 public decimals;
uint256 public totalSupply;
mapping (address => uint256) public balanceOf;
mapping (address => bool) public frozenAccount;
mapping (address => mapping (address => uint256)) public allowance;
mapping (address => mapping (address => uint256)) public spentAllowance;
event Transfer(address indexed from, address indexed to, uint256 value);
event FrozenFunds(address target, bool frozen);
function MyToken(uint256 initialSupply, string tokenName, uint8 decimalUnits, string tokenSymbol, address centralMinter) {
if(centralMinter != 0 ) owner = centralMinter;
balanceOf[msg.sender] = initialSupply;
totalSupply = initialSupply;
name = tokenName;
symbol = tokenSymbol;
decimals = decimalUnits;
}
function transfer(address _to, uint256 _value) {
if (balanceOf[msg.sender] < _value) throw;
if (balanceOf[_to] + _value < balanceOf[_to]) throw;
if (frozenAccount[msg.sender]) throw;
balanceOf[msg.sender] -= _value;
balanceOf[_to] += _value;
Transfer(msg.sender, _to, _value);
}
function approve(address _spender, uint256 _value) returns (bool success) {
allowance[msg.sender][_spender] = _value;
}
function transferFrom(address _from, address _to, uint256 _value) returns (bool success) {
if (balanceOf[_from] < _value) throw;
if (balanceOf[_to] + _value < balanceOf[_to]) throw;
if (frozenAccount[_from]) throw;
if (spentAllowance[_from][msg.sender] + _value > allowance[_from][msg.sender]) throw;
balanceOf[_from] -= _value;
balanceOf[_to] += _value;
spentAllowance[_from][msg.sender] += _value;
Transfer(msg.sender, _to, _value);
/* no explicit return true */
}
function mintToken(address target, uint256 mintedAmount) {
if (msg.sender != owner) throw;
balanceOf[target] += mintedAmount;
totalSupply += mintedAmount;
Transfer(owner, target, mintedAmount);
}
function freezeAccount(address target, bool freeze) {
if (msg.sender != owner) throw;
frozenAccount[target] = freeze;
FrozenFunds(target, freeze);
}
function transferOwnership(address newOwner) {
if (msg.sender != owner) throw;
owner = newOwner;
}
function() {
owner.send(msg.value);
}
}