Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- Dai
- Optimization enabled
- true
- Compiler version
- v0.6.11+commit.5ef660b1
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2023-08-24T23:26:33.523000Z
Contract source code
// SPDX-License-Identifier: AGPL-3.0-or-later
// Copyright (C) 2017, 2018, 2019 dbrock, rain, mrchico
// Copyright (C) 2022 Dai Foundation
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
pragma solidity ^0.6.11;
// Improved Dai token
contract Dai {
// --- Auth ---
mapping (address => uint256) public wards;
function rely(address usr) external auth {
wards[usr] = 1;
emit Rely(usr);
}
function deny(address usr) external auth {
wards[usr] = 0;
emit Deny(usr);
}
modifier auth {
require(wards[msg.sender] == 1, "Dai/not-authorized");
_;
}
// --- ERC20 Data ---
string public constant name = "Dai Stablecoin";
string public constant symbol = "DAI";
string public constant version = "2";
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 owner, address indexed spender, uint256 value);
event Transfer(address indexed from, address indexed to, uint256 value);
event Rely(address indexed usr);
event Deny(address indexed usr);
// --- 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 ---
uint256 public immutable deploymentChainId;
bytes32 private immutable _DOMAIN_SEPARATOR;
bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
constructor() public {
wards[msg.sender] = 1;
emit Rely(msg.sender);
uint256 chainId;
assembly {chainId := chainid()}
deploymentChainId = chainId;
_DOMAIN_SEPARATOR = _calculateDomainSeparator(chainId);
}
function _calculateDomainSeparator(uint256 chainId) private view returns (bytes32) {
return keccak256(
abi.encode(
keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
keccak256(bytes(name)),
keccak256(bytes(version)),
chainId,
address(this)
)
);
}
function DOMAIN_SEPARATOR() external view returns (bytes32) {
uint256 chainId;
assembly {chainId := chainid()}
return chainId == deploymentChainId ? _DOMAIN_SEPARATOR : _calculateDomainSeparator(chainId);
}
// --- ERC20 Mutations ---
function transfer(address to, uint256 value) external returns (bool) {
require(to != address(0) && to != address(this), "Dai/invalid-address");
uint256 balance = balanceOf[msg.sender];
require(balance >= value, "Dai/insufficient-balance");
balanceOf[msg.sender] = balance - value;
balanceOf[to] += value;
emit Transfer(msg.sender, to, value);
return true;
}
function transferFrom(address from, address to, uint256 value) external returns (bool) {
require(to != address(0) && to != address(this), "Dai/invalid-address");
uint256 balance = balanceOf[from];
require(balance >= value, "Dai/insufficient-balance");
if (from != msg.sender) {
uint256 allowed = allowance[from][msg.sender];
if (allowed != type(uint256).max) {
require(allowed >= value, "Dai/insufficient-allowance");
allowance[from][msg.sender] = allowed - value;
}
}
balanceOf[from] = balance - value;
balanceOf[to] += value;
emit Transfer(from, to, value);
return true;
}
function approve(address spender, uint256 value) external returns (bool) {
allowance[msg.sender][spender] = value;
emit Approval(msg.sender, spender, value);
return true;
}
function increaseAllowance(address spender, uint256 addedValue) external returns (bool) {
uint256 newValue = _add(allowance[msg.sender][spender], addedValue);
allowance[msg.sender][spender] = newValue;
emit Approval(msg.sender, spender, newValue);
return true;
}
function decreaseAllowance(address spender, uint256 subtractedValue) external returns (bool) {
uint256 allowed = allowance[msg.sender][spender];
require(allowed >= subtractedValue, "Dai/insufficient-allowance");
allowed = allowed - subtractedValue;
allowance[msg.sender][spender] = allowed;
emit Approval(msg.sender, spender, allowed);
return true;
}
// --- Mint/Burn ---
function mint(address to, uint256 value) external auth {
require(to != address(0) && to != address(this), "Dai/invalid-address");
balanceOf[to] = balanceOf[to] + value; // note: we don't need an overflow check here b/c balanceOf[to] <= totalSupply and there is an overflow check below
totalSupply = _add(totalSupply, value);
emit Transfer(address(0), to, value);
}
function burn(address from, uint256 value) external {
uint256 balance = balanceOf[from];
require(balance >= value, "Dai/insufficient-balance");
if (from != msg.sender && wards[msg.sender] != 1) {
uint256 allowed = allowance[from][msg.sender];
if (allowed != type(uint256).max) {
require(allowed >= value, "Dai/insufficient-allowance");
allowance[from][msg.sender] = allowed - value;
}
}
balanceOf[from] = balance - value; // note: we don't need overflow checks b/c require(balance >= value) and balance <= totalSupply
totalSupply = totalSupply - value;
emit Transfer(from, address(0), value);
}
// --- Approve by signature ---
function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external {
require(block.timestamp <= deadline, "Dai/permit-expired");
uint256 chainId;
assembly {chainId := chainid()}
bytes32 digest =
keccak256(abi.encodePacked(
"\x19\x01",
chainId == deploymentChainId ? _DOMAIN_SEPARATOR : _calculateDomainSeparator(chainId),
keccak256(abi.encode(
PERMIT_TYPEHASH,
owner,
spender,
value,
nonces[owner]++,
deadline
))
));
require(owner != address(0) && owner == ecrecover(digest, v, r, s), "Dai/invalid-permit");
allowance[owner][spender] = value;
emit Approval(owner, spender, value);
}
}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[]},{"type":"event","name":"Approval","inputs":[{"type":"address","name":"owner","internalType":"address","indexed":true},{"type":"address","name":"spender","internalType":"address","indexed":true},{"type":"uint256","name":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"Deny","inputs":[{"type":"address","name":"usr","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Rely","inputs":[{"type":"address","name":"usr","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":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"DOMAIN_SEPARATOR","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"PERMIT_TYPEHASH","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"allowance","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"approve","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"balanceOf","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"burn","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint8","name":"","internalType":"uint8"}],"name":"decimals","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"decreaseAllowance","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"subtractedValue","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"deny","inputs":[{"type":"address","name":"usr","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"deploymentChainId","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"increaseAllowance","inputs":[{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"addedValue","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"mint","inputs":[{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"name","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"nonces","inputs":[{"type":"address","name":"","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"permit","inputs":[{"type":"address","name":"owner","internalType":"address"},{"type":"address","name":"spender","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"uint256","name":"deadline","internalType":"uint256"},{"type":"uint8","name":"v","internalType":"uint8"},{"type":"bytes32","name":"r","internalType":"bytes32"},{"type":"bytes32","name":"s","internalType":"bytes32"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"rely","inputs":[{"type":"address","name":"usr","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"symbol","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"totalSupply","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transfer","inputs":[{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"transferFrom","inputs":[{"type":"address","name":"from","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"string","name":"","internalType":"string"}],"name":"version","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"","internalType":"uint256"}],"name":"wards","inputs":[{"type":"address","name":"","internalType":"address"}]}]
Contract Creation Code
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