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Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
This contract has been partially verified via Sourcify.
View contract in Sourcify repository
- Contract name:
- Hakka
- Optimization enabled
- true
- Compiler version
- v0.5.16+commit.9c3226ce
- Optimization runs
- 200
- EVM Version
- istanbul
- Verified at
- 2026-03-10T19:51:04.267618Z
Constructor Arguments
454950373132446f6d61696e28737472696e67206e616d652c737472696e672076657273696f6e2c75696e7432353620636861696e49642c6164647265737320766572696679696e67436f6e7472616374290000000000000000000000000000000000000000000000000000000000000001
Arg [0] (uint256) : 31339120015659993862160253144463915315563489969021235592778649851284316645152
Hakka.sol
pragma solidity 0.5.16;
contract Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner() {
require(msg.sender == owner, "permission denied");
_;
}
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0), "invalid address");
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
contract ApproveAndCallFallBack {
function receiveApproval(address from, uint256 value, address token, bytes calldata data) external;
}
contract Hakka is Ownable {
// --- ERC20 Data ---
string public constant name = "Hakka Finance";
string public constant symbol = "HAKKA";
string public constant version = "1";
uint8 public constant decimals = 18;
uint256 public totalSupply;
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) public allowance;
mapping (address => uint256) public nonces;
event Approval(address indexed holder, address indexed spender, uint256 amount);
event Transfer(address indexed from, address indexed to, uint256 amount);
// --- Math ---
function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
require((z = x + y) >= x);
}
function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
require((z = x - y) <= x);
}
// --- EIP712 niceties ---
bytes32 public DOMAIN_SEPARATOR;
// bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address holder,address spender,uint256 nonce,uint256 expiry,bool allowed)");
bytes32 public constant PERMIT_TYPEHASH = 0xea2aa0a1be11a07ed86d755c93467f4f82362b452371d1ba94d1715123511acb;
constructor(uint256 chainId_) public {
DOMAIN_SEPARATOR = keccak256(abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(name)),
keccak256(bytes(version)),
chainId_,
address(this)
));
}
// --- Token ---
function transfer(address to, uint256 amount) external returns (bool) {
return transferFrom(msg.sender, to, amount);
}
function transferFrom(address from, address to, uint256 amount) public returns (bool) {
if (from != msg.sender && allowance[from][msg.sender] != uint256(-1))
allowance[from][msg.sender] = sub(allowance[from][msg.sender], amount);
require(balanceOf[from] >= amount, "insufficient-balance");
balanceOf[from] = sub(balanceOf[from], amount);
balanceOf[to] = add(balanceOf[to], amount);
emit Transfer(from, to, amount);
return true;
}
function mint(address to, uint256 amount) external onlyOwner {
balanceOf[to] = add(balanceOf[to], amount);
totalSupply = add(totalSupply, amount);
emit Transfer(address(0), to, amount);
}
function burn(address from, uint256 amount) external {
if (from != msg.sender && allowance[from][msg.sender] != uint256(-1))
allowance[from][msg.sender] = sub(allowance[from][msg.sender], amount);
require(balanceOf[from] >= amount, "insufficient-balance");
balanceOf[from] = sub(balanceOf[from], amount);
totalSupply = sub(totalSupply, amount);
emit Transfer(from, address(0), amount);
}
function approve(address spender, uint256 amount) external returns (bool) {
allowance[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
return true;
}
// --- Approve and call contract ---
function approveAndCall(address spender, uint256 amount, bytes calldata data) external returns (bool) {
allowance[msg.sender][spender] = amount;
emit Approval(msg.sender, spender, amount);
ApproveAndCallFallBack(spender).receiveApproval(msg.sender, amount, address(this), data);
return true;
}
// --- Approve by signature ---
function permit(address holder, address spender, uint256 nonce, uint256 expiry,
bool allowed, uint8 v, bytes32 r, bytes32 s) external
{
bytes32 digest =
keccak256(abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR,
keccak256(abi.encode(PERMIT_TYPEHASH,
holder,
spender,
nonce,
expiry,
allowed))
));
require(holder != address(0), "invalid-address-0");
require(holder == ecrecover(digest, v, r, s), "invalid-permit");
require(expiry == 0 || now <= expiry, "permit-expired");
require(nonce == nonces[holder]++, "invalid-nonce");
uint256 amount = allowed ? uint256(-1) : 0;
allowance[holder][spender] = amount;
emit Approval(holder, spender, amount);
}
}
Compiler Settings
{"remappings":[],"optimizer":{"runs":200,"enabled":true},"libraries":{},"evmVersion":"istanbul","compilationTarget":{"Hakka.sol":"Hakka"}}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"uint256","name":"chainId_","internalType":"uint256"}]},{"type":"event","name":"Approval","inputs":[{"type":"address","name":"holder","internalType":"address","indexed":true},{"type":"address","name":"spender","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":true},{"type":"uint256","name":"amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"DOMAIN_SEPARATOR","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"PERMIT_TYPEHASH","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"allowance","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"address","name":"","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"approve","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"approveAndCall","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"},{"type":"bytes","name":"data","internalType":"bytes"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"burn","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint8","name":"","internalType":"uint8"}],"name":"decimals","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"mint","inputs":[{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"","internalType":"string"}],"name":"name","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"nonces","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"permit","inputs":[{"type":"address","name":"holder","internalType":"address"},{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"nonce","internalType":"uint256"},{"type":"uint256","name":"expiry","internalType":"uint256"},{"type":"bool","name":"allowed","internalType":"bool"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"","internalType":"string"}],"name":"symbol","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalSupply","inputs":[],"constant":true},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transfer","inputs":[{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transferFrom","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"","internalType":"string"}],"name":"version","inputs":[],"constant":true}]
Contract Creation Code
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ByteCode
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