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Outline

• library SafeMath
•    - function add(uint256 x, uint256 y)
•    - function sub(uint256 x, uint256 y)
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transfer(address recipient, ...
•    - function transferFrom(
•  contract FlashToken is IERC20 *
•    - function _validateSignedData(
•    - function _mint(address to, uint256 va ...
•    - function _burn(address from, uint256 ...
•    - function _approve(
•    - function _transfer(
•    - function getChainId()
•    - function getDomainSeparator()
•    - function mint(address to, uint256 val ...
•    - function burn(uint256 value)
•    - function approve(address spender, uin ...
•    - function transfer(address to, uint256 ...
•    - function transferFrom(
•    - function permit(
•    - function transferWithAuthorization(

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/**
 *Submitted for verification at Etherscan.io on 2021-03-31
*/

// SPDX-License-Identifier: MIT
pragma solidity 0.7.4;

library SafeMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, "MATH:ADD_OVERFLOW");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "MATH:SUB_UNDERFLOW");
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transfer(address recipient, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);
}

// Lightweight token modelled after UNI-LP:
// https://github.com/Uniswap/uniswap-v2-core/blob/v1.0.1/contracts/UniswapV2ERC20.sol
// Adds:
//   - An exposed `mint()` with minting role
//   - An exposed `burn()`
//   - ERC-3009 (`transferWithAuthorization()`)
contract FlashToken is IERC20 {
    using SafeMath for uint256;

    // bytes32 private constant EIP712DOMAIN_HASH =
    // keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)")
    bytes32 private constant EIP712DOMAIN_HASH = 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f;

    // bytes32 private constant NAME_HASH = keccak256("FLASH")
    bytes32 private constant NAME_HASH = 0x345b72c36b14f1cee01efb8ac4b299dc7b8d873e28b4796034548a3d371a4d2f;

    // bytes32 private constant VERSION_HASH = keccak256("2")
    bytes32 private constant VERSION_HASH = 0xad7c5bef027816a800da1736444fb58a807ef4c9603b7848673f7e3a68eb14a5;

    // bytes32 public constant PERMIT_TYPEHASH =
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;

    // bytes32 public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH =
    // keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)");
    bytes32 public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267;

    string public constant name = "Flashstake";
    string public constant symbol = "FLASH";
    uint8 public constant decimals = 18;

    address public constant FLASH_PROTOCOL = 0x15EB0c763581329C921C8398556EcFf85Cc48275;
    address public constant FLASH_CLAIM = 0xf2319b6D2aB252d8D80D8CEC34DaF0079222A624;

    uint256 public override totalSupply;

    mapping(address => uint256) public override balanceOf;
    mapping(address => mapping(address => uint256)) public override allowance;

    // ERC-2612, ERC-3009 state
    mapping(address => uint256) public nonces;
    mapping(address => mapping(bytes32 => bool)) public authorizationState;

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);
    event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce);

    modifier onlyMinter {
        require(msg.sender == FLASH_PROTOCOL || msg.sender == FLASH_CLAIM, "FlashToken:: NOT_MINTER");
        _;
    }

    constructor() {
        // BlockZero Labs: Foundation Fund
        _mint(0x842f8f6fB524996d0b660621DA895166E1ceA691, 1200746000000000000000000);
        _mint(0x0945d9033147F27aDDFd3e7532ECD2100cb91032, 1000000000000000000000000);
    }

    function _validateSignedData(
        address signer,
        bytes32 encodeData,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal view {
        bytes32 digest = keccak256(abi.encodePacked("\x19\x01", getDomainSeparator(), encodeData));
        address recoveredAddress = ecrecover(digest, v, r, s);
        // Explicitly disallow authorizations for address(0) as ecrecover returns address(0) on malformed messages
        require(recoveredAddress != address(0) && recoveredAddress == signer, "FlashToken:: INVALID_SIGNATURE");
    }

    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint256 value) internal {
        // Balance is implicitly checked with SafeMath's underflow protection
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(
        address owner,
        address spender,
        uint256 value
    ) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(
        address from,
        address to,
        uint256 value
    ) private {
        require(to != address(this) && to != address(0), "FlashToken:: RECEIVER_IS_TOKEN_OR_ZERO");

        // Balance is implicitly checked with SafeMath's underflow protection
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function getChainId() public pure returns (uint256 chainId) {
        // solhint-disable-next-line no-inline-assembly
        assembly {
            chainId := chainid()
        }
    }

    function getDomainSeparator() public view returns (bytes32) {
        return keccak256(abi.encode(EIP712DOMAIN_HASH, NAME_HASH, VERSION_HASH, getChainId(), address(this)));
    }

    function mint(address to, uint256 value) external onlyMinter returns (bool) {
        _mint(to, value);
        return true;
    }

    function burn(uint256 value) external returns (bool) {
        _burn(msg.sender, value);
        return true;
    }

    function approve(address spender, uint256 value) external override returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint256 value) external override returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external override returns (bool) {
        uint256 fromAllowance = allowance[from][msg.sender];
        if (fromAllowance != uint256(-1)) {
            // Allowance is implicitly checked with SafeMath's underflow protection
            allowance[from][msg.sender] = fromAllowance.sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(deadline >= block.timestamp, "FlashToken:: AUTH_EXPIRED");

        bytes32 encodeData = keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner], deadline));
        nonces[owner] = nonces[owner].add(1);
        _validateSignedData(owner, encodeData, v, r, s);

        _approve(owner, spender, value);
    }

    function transferWithAuthorization(
        address from,
        address to,
        uint256 value,
        uint256 validAfter,
        uint256 validBefore,
        bytes32 nonce,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        require(block.timestamp > validAfter, "FlashToken:: AUTH_NOT_YET_VALID");
        require(block.timestamp < validBefore, "FlashToken:: AUTH_EXPIRED");
        require(!authorizationState[from][nonce], "FlashToken:: AUTH_ALREADY_USED");

        bytes32 encodeData = keccak256(abi.encode(TRANSFER_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce));
        _validateSignedData(from, encodeData, v, r, s);

        authorizationState[from][nonce] = true;
        emit AuthorizationUsed(from, nonce);

        _transfer(from, to, value);
    }
}

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ternalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"validAfter","type":"uint256"},{"internalType":"uint256","name":"validBefore","type":"uint256"},{"internalType":"bytes32","name":"nonce","type":"bytes32"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"transferWithAuthorization","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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