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Dai

Dai

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Verified
Ethereum
ADDRESS
0x6b175474e89094c44da98b954eedeac495271d0f
0x6b175474e89094c44da98b954eedeac495271d0f
ERC20
Solidity
Verified
Ethereum
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https://www.alchemy.com/smart-contracts/dai

Contract Information

The following smart contract is the implementation of the Dai stablecoin. It is an ERC20 token with additional functionality such as `mint`, `burn`, `permit`, and `move`. The contract also includes an `auth` modifier to restrict access to certain functions. The `permit` function allows for gasless approvals using EIP-712.
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Public Information

  • `name`: a public constant string variable that represents the name of the Dai Stablecoin.
  • `symbol`: a public constant string variable that represents the symbol of the Dai Stablecoin.
  • `version`: a public constant string variable that represents the version of the Dai Stablecoin.
  • `decimals`: a public constant uint8 variable that represents the number of decimals used for the Dai Stablecoin.
  • `totalSupply`: a public uint256 variable that represents the total supply of the Dai Stablecoin.
  • `wards`: a mapping that maps an address to a uint, representing the authorization status of the address.
    ‍

Public or external functions

  • `rely(address guy) external note auth`: sets the authorization status of an address to 1.
  • `deny(address guy) external note auth`: sets the authorization status of an address to 0.
  • `transfer(address dst, uint wad) external returns (bool)`: transfers a specified amount of Dai Stablecoin from the sender's address to the specified destination address.
  • `transferFrom(address src, address dst, uint wad) public returns (bool)`: transfers a specified amount of Dai Stablecoin from the source address to the specified destination address, provided that the sender has been authorized to spend the Dai Stablecoin on behalf of the source address.
  • `mint(address usr, uint wad) external auth`: mints a specified amount of Dai Stablecoin and adds it to the balance of the specified address.
  • `burn(address usr, uint wad) external`: burns a specified amount of Dai Stablecoin from the balance of the specified address.
  • `approve(address usr, uint wad) external returns (bool)`: approves the specified address to spend a specified amount of Dai Stablecoin on behalf of the sender.
  • `push(address usr, uint wad) external`: transfers a specified amount of Dai Stablecoin from the sender's address to the specified destination address.
  • `pull(address usr, uint wad) external`: transfers a specified amount of Dai Stablecoin from the specified source address to the sender's address.
  • `move(address src, address dst, uint wad) external`: transfers a specified amount of Dai Stablecoin from the specified source address to the specified destination address.

Events

  • `Approval(address indexed src, address indexed guy, uint wad)`: emitted when the specified address is approved to spend a specified amount of Dai Stablecoin on behalf of the sender.
  • `Transfer(address indexed src, address indexed dst, uint wad)`: emitted when a specified amount of Dai Stablecoin is transferred from the sender's address to the specified destination address.

Inherits

  • `LibNote`: Dai contract inherits from `LibNote` contract.

Dai Source Code

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// hevm: flattened sources of /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/dai.sol pragma solidity =0.5.12; ////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/lib.sol // This program is free software: you can redistribute it and/or modify // it under the terms of the GNU 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 General Public License for more details. // You should have received a copy of the GNU General Public License // along with this program. If not, see <http://www.gnu.org/licenses/>. /* 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 ) } } } ////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/dai.sol // Copyright (C) 2017, 2018, 2019 dbrock, rain, mrchico // 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 0.5.12; */ /* import "./lib.sol"; */ contract Dai 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, "Dai/not-authorized"); _; } // --- ERC20 Data --- string public constant name = "Dai Stablecoin"; string public constant symbol = "DAI"; 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, "Dai/insufficient-balance"); if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) { require(allowance[src][msg.sender] >= wad, "Dai/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, "Dai/insufficient-balance"); if (usr != msg.sender && allowance[usr][msg.sender] != uint(-1)) { require(allowance[usr][msg.sender] >= wad, "Dai/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), "Dai/invalid-address-0"); require(holder == ecrecover(digest, v, r, s), "Dai/invalid-permit"); require(expiry == 0 || now <= expiry, "Dai/permit-expired"); require(nonce == nonces[holder]++, "Dai/invalid-nonce"); uint wad = allowed ? uint(-1) : 0; allowance[holder][spender] = wad; emit Approval(holder, spender, wad); } }
< // hevm: flattened sources of /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/dai.sol
pragma solidity =0.5.12;

////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/lib.sol
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU 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 General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

/* 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
                )
        }
    }
}

////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/dai.sol
// Copyright (C) 2017, 2018, 2019 dbrock, rain, mrchico

// 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 0.5.12; */

/* import "./lib.sol"; */

contract Dai 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, "Dai/not-authorized");
        _;
    }

    // --- ERC20 Data ---
    string  public constant name     = "Dai Stablecoin";
    string  public constant symbol   = "DAI";
    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, "Dai/insufficient-balance");
        if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {
            require(allowance[src][msg.sender] >= wad, "Dai/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, "Dai/insufficient-balance");
        if (usr != msg.sender && allowance[usr][msg.sender] != uint(-1)) {
            require(allowance[usr][msg.sender] >= wad, "Dai/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), "Dai/invalid-address-0");
        require(holder == ecrecover(digest, v, r, s), "Dai/invalid-permit");
        require(expiry == 0 || now <= expiry, "Dai/permit-expired");
        require(nonce == nonces[holder]++, "Dai/invalid-nonce");
        uint wad = allowed ? uint(-1) : 0;
        allowance[holder][spender] = wad;
        emit Approval(holder, spender, wad);
    }
} <

Dai ABI

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[{"inputs":[{"internalType":"uint256","name":"chainId_","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"src","type":"address"},{"indexed":true,"internalType":"address","name":"guy","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":true,"inputs":[{"indexed":true,"internalType":"bytes4","name":"sig","type":"bytes4"},{"indexed":true,"internalType":"address","name":"usr","type":"address"},{"indexed":true,"internalType":"bytes32","name":"arg1","type":"bytes32"},{"indexed":true,"internalType":"bytes32","name":"arg2","type":"bytes32"},{"indexed":false,"internalType":"bytes","name":"data","type":"bytes"}],"name":"LogNote","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"src","type":"address"},{"indexed":true,"internalType":"address","name":"dst","type":"address"},{"indexed":false,"internalType":"uint256","name":"wad","type":"uint256"}],"name":"Transfer","type":"event"},{"constant":true,"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"burn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"guy","type":"address"}],"name":"deny","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"mint","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"move","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"holder","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"nonce","type":"uint256"},{"internalType":"uint256","name":"expiry","type":"uint256"},{"internalType":"bool","name":"allowed","type":"bool"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"pull","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"usr","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"push","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"guy","type":"address"}],"name":"rely","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"wad","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"wards","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"}]
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