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- Contract name:
- Token
- Optimization enabled
- false
- Compiler version
- v0.5.12+commit.7709ece9
- EVM Version
- petersburg
- Verified at
- 2021-10-28T07:02:17.977839Z
Constructor Arguments
000000000000000000000000000000000000000000000000000000000000006a
Arg [0] (uint256) : 106
Contract source code
pragma solidity >=0.5.12;
contract LibNote {
event LogNote(
bytes4 indexed sig,
address indexed usr,
bytes32 indexed arg1,
bytes32 indexed arg2,
bytes data
) anonymous;
modifier note {
_;
assembly {
// log an 'anonymous' event with a constant 6 words of calldata
// and four indexed topics: selector, caller, arg1 and arg2
let mark := msize() // end of memory ensures zero
mstore(0x40, add(mark, 288)) // update free memory pointer
mstore(mark, 0x20) // bytes type data offset
mstore(add(mark, 0x20), 224) // bytes size (padded)
calldatacopy(add(mark, 0x40), 0, 224) // bytes payload
log4(mark, 288, // calldata
shl(224, shr(224, calldataload(0))), // msg.sig
caller(), // msg.sender
calldataload(4), // arg1
calldataload(36) // arg2
)
}
}
}
contract Token is LibNote {
// --- Auth ---
mapping (address => uint) public wards;
function rely(address guy) external note auth { wards[guy] = 1; }
function deny(address guy) external note auth { wards[guy] = 0; }
modifier auth {
require(wards[msg.sender] == 1, "USDV/not-authorized");
_;
}
// --- ERC20 Data ---
string public constant name = "USD Velero Stablecoin";
string public constant symbol = "USDV";
string public constant version = "1";
uint8 public constant decimals = 18;
uint256 public totalSupply;
mapping (address => uint) public balanceOf;
mapping (address => mapping (address => uint)) public allowance;
mapping (address => uint) public nonces;
event Approval(address indexed src, address indexed guy, uint wad);
event Transfer(address indexed src, address indexed dst, uint wad);
// --- Math ---
function add(uint x, uint y) internal pure returns (uint z) {
require((z = x + y) >= x);
}
function sub(uint x, uint y) internal pure returns (uint 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 {
wards[msg.sender] = 1;
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 dst, uint wad) external returns (bool) {
return transferFrom(msg.sender, dst, wad);
}
function transferFrom(address src, address dst, uint wad)
public returns (bool)
{
require(balanceOf[src] >= wad, "USDV/insufficient-balance");
if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
require(allowance[src][msg.sender] >= wad, "USDV/insufficient-allowance");
allowance[src][msg.sender] = sub(allowance[src][msg.sender], wad);
}
balanceOf[src] = sub(balanceOf[src], wad);
balanceOf[dst] = add(balanceOf[dst], wad);
emit Transfer(src, dst, wad);
return true;
}
function mint(address usr, uint wad) external auth {
balanceOf[usr] = add(balanceOf[usr], wad);
totalSupply = add(totalSupply, wad);
emit Transfer(address(0), usr, wad);
}
function burn(address usr, uint wad) external {
require(balanceOf[usr] >= wad, "USDV/insufficient-balance");
if (usr != msg.sender && allowance[usr][msg.sender] != uint(-1)) {
require(allowance[usr][msg.sender] >= wad, "USDV/insufficient-allowance");
allowance[usr][msg.sender] = sub(allowance[usr][msg.sender], wad);
}
balanceOf[usr] = sub(balanceOf[usr], wad);
totalSupply = sub(totalSupply, wad);
emit Transfer(usr, address(0), wad);
}
function approve(address usr, uint wad) external returns (bool) {
allowance[msg.sender][usr] = wad;
emit Approval(msg.sender, usr, wad);
return true;
}
// --- Alias ---
function push(address usr, uint wad) external {
transferFrom(msg.sender, usr, wad);
}
function pull(address usr, uint wad) external {
transferFrom(usr, msg.sender, wad);
}
function move(address src, address dst, uint wad) external {
transferFrom(src, dst, wad);
}
// --- 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), "USDV/invalid-address-0");
require(holder == ecrecover(digest, v, r, s), "USDV/invalid-permit");
require(expiry == 0 || now <= expiry, "USDV/permit-expired");
require(nonce == nonces[holder]++, "USDV/invalid-nonce");
uint wad = allowed ? uint(-1) : 0;
allowance[holder][spender] = wad;
emit Approval(holder, spender, wad);
}
}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","payable":false,"inputs":[{"type":"uint256","name":"chainId_","internalType":"uint256"}]},{"type":"event","name":"Approval","inputs":[{"type":"address","name":"src","internalType":"address","indexed":true},{"type":"address","name":"guy","internalType":"address","indexed":true},{"type":"uint256","name":"wad","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"LogNote","inputs":[{"type":"bytes4","name":"sig","internalType":"bytes4","indexed":true},{"type":"address","name":"usr","internalType":"address","indexed":true},{"type":"bytes32","name":"arg1","internalType":"bytes32","indexed":true},{"type":"bytes32","name":"arg2","internalType":"bytes32","indexed":true},{"type":"bytes","name":"data","internalType":"bytes","indexed":false}],"anonymous":true},{"type":"event","name":"Transfer","inputs":[{"type":"address","name":"src","internalType":"address","indexed":true},{"type":"address","name":"dst","internalType":"address","indexed":true},{"type":"uint256","name":"wad","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":"usr","internalType":"address"},{"type":"uint256","name":"wad","internalType":"uint256"}],"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":"usr","internalType":"address"},{"type":"uint256","name":"wad","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":"deny","inputs":[{"type":"address","name":"guy","internalType":"address"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"mint","inputs":[{"type":"address","name":"usr","internalType":"address"},{"type":"uint256","name":"wad","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"move","inputs":[{"type":"address","name":"src","internalType":"address"},{"type":"address","name":"dst","internalType":"address"},{"type":"uint256","name":"wad","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":"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":"nonpayable","payable":false,"outputs":[],"name":"pull","inputs":[{"type":"address","name":"usr","internalType":"address"},{"type":"uint256","name":"wad","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"push","inputs":[{"type":"address","name":"usr","internalType":"address"},{"type":"uint256","name":"wad","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[],"name":"rely","inputs":[{"type":"address","name":"guy","internalType":"address"}],"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":"dst","internalType":"address"},{"type":"uint256","name":"wad","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"nonpayable","payable":false,"outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transferFrom","inputs":[{"type":"address","name":"src","internalType":"address"},{"type":"address","name":"dst","internalType":"address"},{"type":"uint256","name":"wad","internalType":"uint256"}],"constant":false},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"string","name":"","internalType":"string"}],"name":"version","inputs":[],"constant":true},{"type":"function","stateMutability":"view","payable":false,"outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"wards","inputs":[{"type":"address","name":"","internalType":"address"}],"constant":true}]
Deployed ByteCode
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