ETH Price: $2,370.08 (-3.77%)

Contract

0xb3999F658C0391d94A37f7FF328F3feC942BcADC
 

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Private Name Tags

TokenTracker

Hashflow (HFT) (@$0.133)

Multichain Info

1 address found via
Transaction Hash
Method
Block
From
To
Transfer206870502024-09-05 21:23:1132 mins ago1725571391IN
Hashflow: HFT Token
0 ETH0.000355278.88638947
Transfer206869912024-09-05 21:11:2344 mins ago1725570683IN
Hashflow: HFT Token
0 ETH0.000274344.80428849
Transfer206869052024-09-05 20:54:111 hr ago1725569651IN
Hashflow: HFT Token
0 ETH0.000249564.37311551
Transfer206866962024-09-05 20:12:111 hr ago1725567131IN
Hashflow: HFT Token
0 ETH0.000265864.6558211
Transfer206860522024-09-05 18:03:113 hrs ago1725559391IN
Hashflow: HFT Token
0 ETH0.000293297.33595544
Transfer206860332024-09-05 17:59:233 hrs ago1725559163IN
Hashflow: HFT Token
0 ETH0.000358436.27949743
Transfer206858852024-09-05 17:29:474 hrs ago1725557387IN
Hashflow: HFT Token
0 ETH0.000306165.36264405
Transfer206858492024-09-05 17:22:354 hrs ago1725556955IN
Hashflow: HFT Token
0 ETH0.000135713.85522739
Transfer206858282024-09-05 17:18:234 hrs ago1725556703IN
Hashflow: HFT Token
0 ETH0.000251094.39901854
Transfer206855402024-09-05 16:20:115 hrs ago1725553211IN
Hashflow: HFT Token
0 ETH0.000220485.51154306
Transfer206854982024-09-05 16:11:475 hrs ago1725552707IN
Hashflow: HFT Token
0 ETH0.000232565.81355787
Transfer206854972024-09-05 16:11:355 hrs ago1725552695IN
Hashflow: HFT Token
0 ETH0.000237365.93538276
Transfer206853902024-09-05 15:49:596 hrs ago1725551399IN
Hashflow: HFT Token
0 ETH0.000367366.43468295
Transfer206851782024-09-05 15:07:356 hrs ago1725548855IN
Hashflow: HFT Token
0 ETH0.000196815.59264183
Transfer206851562024-09-05 15:02:596 hrs ago1725548579IN
Hashflow: HFT Token
0 ETH0.000301955.28894176
Transfer206850532024-09-05 14:42:237 hrs ago1725547343IN
Hashflow: HFT Token
0 ETH0.000175614.98852387
Transfer206849842024-09-05 14:28:237 hrs ago1725546503IN
Hashflow: HFT Token
0 ETH0.000451868.63911745
Approve206847562024-09-05 13:42:358 hrs ago1725543755IN
Hashflow: HFT Token
0 ETH0.000120824.9321049
Transfer206837772024-09-05 10:26:3511 hrs ago1725531995IN
Hashflow: HFT Token
0 ETH0.000256054.48496512
Transfer206836062024-09-05 9:52:1112 hrs ago1725529931IN
Hashflow: HFT Token
0 ETH0.000136113.8679098
Transfer206835792024-09-05 9:46:4712 hrs ago1725529607IN
Hashflow: HFT Token
0 ETH0.00014182.48385505
Transfer206835552024-09-05 9:41:5912 hrs ago1725529319IN
Hashflow: HFT Token
0 ETH0.000173564.34002676
Transfer206835542024-09-05 9:41:4712 hrs ago1725529307IN
Hashflow: HFT Token
0 ETH0.000141862.48542457
Transfer206835212024-09-05 9:35:1112 hrs ago1725528911IN
Hashflow: HFT Token
0 ETH0.000121263.03212096
Approve206835162024-09-05 9:34:1112 hrs ago1725528851IN
Hashflow: HFT Token
0 ETH0.00011522.47782724
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206859282024-09-05 17:38:234 hrs ago1725557903
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206859112024-09-05 17:34:594 hrs ago1725557699
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206844952024-09-05 12:50:239 hrs ago1725540623
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206806972024-09-05 0:06:5921 hrs ago1725494819
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206789082024-09-04 18:07:3527 hrs ago1725473255
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Contract Source Code Verified (Exact Match)

Contract Name:
HFT

Compiler Version
v0.8.11+commit.d7f03943

Optimization Enabled:
Yes with 2000 runs

Other Settings:
default evmVersion, None license

Contract Source Code (Solidity)

/**
 *Submitted for verification at Etherscan.io on 2022-04-20
*/

/**
 * SPDX-License-Identifier: UNLICENSED
 */
pragma solidity 0.8.11;

library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

contract HFT {
    /// @notice EIP-20 token name for this token
    string public constant name = 'Hashflow';

    /// @notice EIP-20 token symbol for this token
    string public constant symbol = 'HFT';

    /// @notice EIP-20 token decimals for this token
    uint8 public constant decimals = 18;

    /// @notice Total number of tokens in circulation
    uint256 public totalSupply = 1_000_000_000e18; // 1 billion HFT

    /// @notice Address which may mint new tokens
    address public minter;

    /// @notice The timestamp after which minting may occur (must be set to 4 years)
    uint256 public mintingAllowedAfter;

    /// @notice Minimum time between mints
    uint32 public constant minimumTimeBetweenMints = 1 days * 365;

    /// @notice Cap on the percentage of totalSupply that can be minted at each mint (set to 5% inflation currently)
    uint8 public mintCap = 5;

    /// @notice Allowance amounts on behalf of others
    mapping(address => mapping(address => uint96)) internal allowances;

    /// @notice Official record of token balances for each account
    mapping(address => uint96) internal balances;

    /// @notice A record of each accounts delegate
    mapping(address => address) public delegates;

    /// @notice A checkpoint for marking number of votes from a given block
    struct Checkpoint {
        uint32 fromBlock;
        uint96 votes;
    }

    /// @notice A record of votes checkpoints for each account, by index
    mapping(address => mapping(uint32 => Checkpoint)) public checkpoints;

    /// @notice The number of checkpoints for each account
    mapping(address => uint32) public numCheckpoints;

    /// @notice The EIP-712 typehash for the contract's domain
    bytes32 public constant DOMAIN_TYPEHASH =
        keccak256(
            'EIP712Domain(string name,uint256 chainId,address verifyingContract)'
        );

    /// @notice The EIP-712 typehash for the delegation struct used by the contract
    bytes32 public constant DELEGATION_TYPEHASH =
        keccak256('Delegation(address delegatee,uint256 nonce,uint256 expiry)');

    /// @notice The EIP-712 typehash for the permit struct used by the contract
    bytes32 public constant PERMIT_TYPEHASH =
        keccak256(
            'Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)'
        );

    /// @notice A record of states for signing / validating signatures
    mapping(address => uint256) public nonces;

    /// @notice An event that is emitted when the minter address is changed
    event MinterChanged(address minter, address newMinter);

    /// @notice An event that is emitted when the mint percentage is changed
    event MintCapChanged(uint256 newMintCap);

    /// @notice An event thats emitted when an account changes its delegate
    event DelegateChanged(
        address indexed delegator,
        address indexed fromDelegate,
        address indexed toDelegate
    );

    /// @notice An event thats emitted when a delegate account's vote balance changes
    event DelegateVotesChanged(
        address indexed delegate,
        uint256 previousBalance,
        uint256 newBalance
    );

    /// @notice The standard EIP-20 transfer event
    event Transfer(address indexed from, address indexed to, uint256 amount);

    /// @notice The standard EIP-20 approval event
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 amount
    );

    /**
     * @notice Construct a new Hashflow token
     * @param account The initial account to grant all the tokens
     * @param minter_ The account with minting ability
     * @param mintingAllowedAfter_ The timestamp after which minting may occur
     */
    constructor(
        address account,
        address minter_,
        uint256 mintingAllowedAfter_
    ) {
        require(
            mintingAllowedAfter_ >= block.timestamp + 1460 days,
            'HFT::constructor: minting can only begin after 4 years'
        );

        require(
            minter_ != address(0),
            'HFT::constructor: minter_ cannot be zero address'
        );

        require(
            account != address(0),
            'HFT::constructor: account cannot be zero address'
        );

        balances[account] = uint96(totalSupply);
        emit Transfer(address(0), account, totalSupply);
        minter = minter_;
        emit MinterChanged(address(0), minter);
        mintingAllowedAfter = mintingAllowedAfter_;
    }

    /**
     * @notice Change the minter address
     * @param minter_ The address of the new minter
     */
    function setMinter(address minter_) external {
        require(
            minter_ != address(0),
            'HFT::setMinter: minter_ cannot be zero address'
        );
        require(
            msg.sender == minter,
            'HFT::setMinter: only the minter can change the minter address'
        );
        minter = minter_;
        emit MinterChanged(minter, minter_);
    }

    function setMintCap(uint256 mintCap_) external {
        require(
            msg.sender == minter,
            'HFT::setMintCap: only the minter can change the mint cap'
        );
        require(
            mintCap_ <= 100,
            'HFT::setMintCap: mint cap should be between 0 and 100'
        );
        mintCap = uint8(mintCap_);
        emit MintCapChanged(uint256(mintCap));
    }

    /**
     * @notice Mint new tokens
     * @param dst The address of the destination account

     */
    function mint(address dst) external {
        require(msg.sender == minter, 'HFT::mint: only the minter can mint');
        require(
            block.timestamp >= mintingAllowedAfter,
            'HFT::mint: minting not allowed yet or exceeds mint cap'
        );
        require(
            dst != address(0),
            'HFT::mint: cannot transfer to the zero address'
        );

        // record the mint
        mintingAllowedAfter = SafeMath.add(
            block.timestamp,
            minimumTimeBetweenMints
        );

        uint96 amount = safe96(
            SafeMath.div(SafeMath.mul(totalSupply, uint256(mintCap)), 100),
            'HFT::mint: amount exceeds 96 bits'
        );

        totalSupply = safe96(
            SafeMath.add(totalSupply, amount),
            'HFT::mint: totalSupply exceeds 96 bits'
        );

        // transfer the amount to the recipient
        balances[dst] = add96(
            balances[dst],
            amount,
            'HFT::mint: transfer amount overflows'
        );
        emit Transfer(address(0), dst, amount);

        // move delegates
        _moveDelegates(address(0), delegates[dst], amount);
    }

    /**
     * @notice Get the number of tokens `spender` is approved to spend on behalf of `account`
     * @param account The address of the account holding the funds
     * @param spender The address of the account spending the funds
     * @return The number of tokens approved
     */
    function allowance(address account, address spender)
        external
        view
        returns (uint256)
    {
        return allowances[account][spender];
    }

    /**
     * @notice Approve `spender` to transfer up to `amount` from `src`
     * @dev This will overwrite the approval amount for `spender`
     *  and is subject to issues noted [here](https://eips.ethereum.org/EIPS/eip-20#approve)
     * @param spender The address of the account which may transfer tokens
     * @param rawAmount The number of tokens that are approved (2^256-1 means infinite)
     * @return Whether or not the approval succeeded
     */
    function approve(address spender, uint256 rawAmount)
        external
        returns (bool)
    {
        _approve(msg.sender, spender, rawAmount);
        return true;
    }

    /**
     * @notice Atomically increases the allowance granted to `spender` by the caller.
     * @dev This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     * @param spender The address of the account which may transfer tokens
     * @param rawAmount The number of tokens that are approved (2^256-1 means infinite)
     * @return Whether or not the approval succeeded
     */
    function increaseAllowance(address spender, uint256 rawAmount)
        external
        returns (bool)
    {
        _approve(
            msg.sender,
            spender,
            allowances[msg.sender][spender] + rawAmount
        );
        return true;
    }

    /**
     * @notice Atomically increases the allowance granted to `spender` by the caller.
     * @dev This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     * @param spender The address of the account which may transfer tokens
     * @param rawAmount The number of tokens that are approved (2^256-1 means infinite)
     * @return Whether or not the approval succeeded
     */
    function decreaseAllowance(address spender, uint256 rawAmount)
        external
        returns (bool)
    {
        _approve(
            msg.sender,
            spender,
            allowances[msg.sender][spender] - rawAmount
        );
        return true;
    }

    /**
     * @notice Triggers an approval from owner to spends
     * @param owner The address to approve from
     * @param spender The address to be approved
     * @param rawAmount The number of tokens that are approved (2^256-1 means infinite)
     * @param deadline The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function permit(
        address owner,
        address spender,
        uint256 rawAmount,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external {
        uint96 amount;
        if (rawAmount == type(uint256).max) {
            amount = type(uint96).max;
        } else {
            amount = safe96(rawAmount, 'HFT::permit: amount exceeds 96 bits');
        }

        bytes32 domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name)),
                getChainId(),
                address(this)
            )
        );
        bytes32 structHash = keccak256(
            abi.encode(
                PERMIT_TYPEHASH,
                owner,
                spender,
                rawAmount,
                nonces[owner]++,
                deadline
            )
        );
        bytes32 digest = keccak256(
            abi.encodePacked('\x19\x01', domainSeparator, structHash)
        );
        address signatory = ecrecover(digest, v, r, s);
        require(signatory != address(0), 'HFT::permit: invalid signature');
        require(signatory == owner, 'HFT::permit: unauthorized');
        require(block.timestamp <= deadline, 'HFT::permit: signature expired');

        allowances[owner][spender] = amount;

        emit Approval(owner, spender, amount);
    }

    /**
     * @notice Get the number of tokens held by the `account`
     * @param account The address of the account to get the balance of
     * @return The number of tokens held
     */
    function balanceOf(address account) external view returns (uint256) {
        return balances[account];
    }

    /**
     * @notice Transfer `amount` tokens from `msg.sender` to `dst`
     * @param dst The address of the destination account
     * @param rawAmount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transfer(address dst, uint256 rawAmount) external returns (bool) {
        uint96 amount = safe96(
            rawAmount,
            'HFT::transfer: amount exceeds 96 bits'
        );
        _transferTokens(msg.sender, dst, amount);
        return true;
    }

    /**
     * @notice Transfer `amount` tokens from `src` to `dst`
     * @param src The address of the source account
     * @param dst The address of the destination account
     * @param rawAmount The number of tokens to transfer
     * @return Whether or not the transfer succeeded
     */
    function transferFrom(
        address src,
        address dst,
        uint256 rawAmount
    ) external returns (bool) {
        address spender = msg.sender;
        uint96 spenderAllowance = allowances[src][spender];
        uint96 amount = safe96(
            rawAmount,
            'HFT::approve: amount exceeds 96 bits'
        );

        if (spender != src && spenderAllowance != type(uint96).max) {
            uint96 newAllowance = sub96(
                spenderAllowance,
                amount,
                'HFT::transferFrom: transfer amount exceeds spender allowance'
            );
            allowances[src][spender] = newAllowance;

            emit Approval(src, spender, newAllowance);
        }

        _transferTokens(src, dst, amount);
        return true;
    }

    /**
     * @notice Delegate votes from `msg.sender` to `delegatee`
     * @param delegatee The address to delegate votes to
     */
    function delegate(address delegatee) public {
        return _delegate(msg.sender, delegatee);
    }

    /**
     * @notice Delegates votes from signatory to `delegatee`
     * @param delegatee The address to delegate votes to
     * @param nonce The contract state required to match the signature
     * @param expiry The time at which to expire the signature
     * @param v The recovery byte of the signature
     * @param r Half of the ECDSA signature pair
     * @param s Half of the ECDSA signature pair
     */
    function delegateBySig(
        address delegatee,
        uint256 nonce,
        uint256 expiry,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public {
        bytes32 domainSeparator = keccak256(
            abi.encode(
                DOMAIN_TYPEHASH,
                keccak256(bytes(name)),
                getChainId(),
                address(this)
            )
        );
        bytes32 structHash = keccak256(
            abi.encode(DELEGATION_TYPEHASH, delegatee, nonce, expiry)
        );
        bytes32 digest = keccak256(
            abi.encodePacked('\x19\x01', domainSeparator, structHash)
        );
        address signatory = ecrecover(digest, v, r, s);
        require(
            signatory != address(0),
            'HFT::delegateBySig: invalid signature'
        );
        require(
            nonce == nonces[signatory]++,
            'HFT::delegateBySig: invalid nonce'
        );
        require(
            block.timestamp <= expiry,
            'HFT::delegateBySig: signature expired'
        );
        return _delegate(signatory, delegatee);
    }

    /**
     * @notice Gets the current votes balance for `account`
     * @param account The address to get votes balance
     * @return The number of current votes for `account`
     */
    function getCurrentVotes(address account) external view returns (uint96) {
        uint32 nCheckpoints = numCheckpoints[account];
        return
            nCheckpoints > 0 ? checkpoints[account][nCheckpoints - 1].votes : 0;
    }

    /**
     * @notice Determine the prior number of votes for an account as of a block number
     * @dev Block number must be a finalized block or else this function will revert to prevent misinformation.
     * @param account The address of the account to check
     * @param blockNumber The block number to get the vote balance at
     * @return The number of votes the account had as of the given block
     */
    function getPriorVotes(address account, uint256 blockNumber)
        public
        view
        returns (uint96)
    {
        require(
            blockNumber < block.number,
            'HFT::getPriorVotes: not yet determined'
        );

        uint32 nCheckpoints = numCheckpoints[account];
        if (nCheckpoints == 0) {
            return 0;
        }

        // First check most recent balance
        if (checkpoints[account][nCheckpoints - 1].fromBlock <= blockNumber) {
            return checkpoints[account][nCheckpoints - 1].votes;
        }

        // Next check implicit zero balance
        if (checkpoints[account][0].fromBlock > blockNumber) {
            return 0;
        }

        uint32 lower = 0;
        uint32 upper = nCheckpoints - 1;
        while (upper > lower) {
            uint32 center = upper - (upper - lower) / 2; // ceil, avoiding overflow
            Checkpoint memory cp = checkpoints[account][center];
            if (cp.fromBlock == blockNumber) {
                return cp.votes;
            } else if (cp.fromBlock < blockNumber) {
                lower = center;
            } else {
                upper = center - 1;
            }
        }
        return checkpoints[account][lower].votes;
    }

    function _delegate(address delegator, address delegatee) internal {
        address currentDelegate = delegates[delegator];
        uint96 delegatorBalance = balances[delegator];
        delegates[delegator] = delegatee;

        emit DelegateChanged(delegator, currentDelegate, delegatee);

        _moveDelegates(currentDelegate, delegatee, delegatorBalance);
    }

    function _approve(
        address caller,
        address spender,
        uint256 rawAmount
    ) internal {
        uint96 amount;
        if (rawAmount == type(uint256).max) {
            amount = type(uint96).max;
        } else {
            amount = safe96(rawAmount, 'HFT::approve: amount exceeds 96 bits');
        }

        allowances[caller][spender] = amount;

        emit Approval(caller, spender, amount);
    }

    function _transferTokens(
        address src,
        address dst,
        uint96 amount
    ) internal {
        require(
            src != address(0),
            'HFT::_transferTokens: cannot transfer from the zero address'
        );
        require(
            dst != address(0),
            'HFT::_transferTokens: cannot transfer to the zero address'
        );

        balances[src] = sub96(
            balances[src],
            amount,
            'HFT::_transferTokens: transfer amount exceeds balance'
        );
        balances[dst] = add96(
            balances[dst],
            amount,
            'HFT::_transferTokens: transfer amount overflows'
        );
        emit Transfer(src, dst, amount);

        _moveDelegates(delegates[src], delegates[dst], amount);
    }

    function _moveDelegates(
        address srcRep,
        address dstRep,
        uint96 amount
    ) internal {
        if (srcRep != dstRep && amount > 0) {
            if (srcRep != address(0)) {
                uint32 srcRepNum = numCheckpoints[srcRep];
                uint96 srcRepOld = srcRepNum > 0
                    ? checkpoints[srcRep][srcRepNum - 1].votes
                    : 0;
                uint96 srcRepNew = sub96(
                    srcRepOld,
                    amount,
                    'HFT::_moveDelegates: vote amount underflows'
                );
                _writeCheckpoint(srcRep, srcRepNum, srcRepOld, srcRepNew);
            }

            if (dstRep != address(0)) {
                uint32 dstRepNum = numCheckpoints[dstRep];
                uint96 dstRepOld = dstRepNum > 0
                    ? checkpoints[dstRep][dstRepNum - 1].votes
                    : 0;
                uint96 dstRepNew = add96(
                    dstRepOld,
                    amount,
                    'HFT::_moveDelegates: vote amount overflows'
                );
                _writeCheckpoint(dstRep, dstRepNum, dstRepOld, dstRepNew);
            }
        }
    }

    function _writeCheckpoint(
        address delegatee,
        uint32 nCheckpoints,
        uint96 oldVotes,
        uint96 newVotes
    ) internal {
        uint32 blockNumber = safe32(
            block.number,
            'HFT::_writeCheckpoint: block number exceeds 32 bits'
        );

        if (
            nCheckpoints > 0 &&
            checkpoints[delegatee][nCheckpoints - 1].fromBlock == blockNumber
        ) {
            checkpoints[delegatee][nCheckpoints - 1].votes = newVotes;
        } else {
            checkpoints[delegatee][nCheckpoints] = Checkpoint(
                blockNumber,
                newVotes
            );
            numCheckpoints[delegatee] = nCheckpoints + 1;
        }

        emit DelegateVotesChanged(delegatee, oldVotes, newVotes);
    }

    function safe32(uint256 n, string memory errorMessage)
        internal
        pure
        returns (uint32)
    {
        require(n < 2**32, errorMessage);
        return uint32(n);
    }

    function safe96(uint256 n, string memory errorMessage)
        internal
        pure
        returns (uint96)
    {
        require(n < 2**96, errorMessage);
        return uint96(n);
    }

    function add96(
        uint96 a,
        uint96 b,
        string memory errorMessage
    ) internal pure returns (uint96) {
        uint96 c = a + b;
        require(c >= a, errorMessage);
        return c;
    }

    function sub96(
        uint96 a,
        uint96 b,
        string memory errorMessage
    ) internal pure returns (uint96) {
        require(b <= a, errorMessage);
        return a - b;
    }

    function getChainId() internal view returns (uint256) {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        return chainId;
    }
}

Contract Security Audit

Contract ABI

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"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"rawAmount","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"minimumTimeBetweenMints","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"dst","type":"address"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"mintCap","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"minter","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"mintingAllowedAfter","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"nonces","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"numCheckpoints","outputs":[{"internalType":"uint32","name":"","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"rawAmount","type":"uint256"},{"internalType":"uint256","name":"deadline","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"permit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"mintCap_","type":"uint256"}],"name":"setMintCap","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"minter_","type":"address"}],"name":"setMinter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"rawAmount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"src","type":"address"},{"internalType":"address","name":"dst","type":"address"},{"internalType":"uint256","name":"rawAmount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

000000000000000000000000ff830ce17d39bbd6a4fef9683308d793df8e34fc000000000000000000000000ff830ce17d39bbd6a4fef9683308d793df8e34fc0000000000000000000000000000000000000000000000000000000069dafd37

-----Decoded View---------------
Arg [0] : account (address): 0xff830ce17D39BbD6a4fef9683308D793dF8E34fC
Arg [1] : minter_ (address): 0xff830ce17D39BbD6a4fef9683308D793dF8E34fC
Arg [2] : mintingAllowedAfter_ (uint256): 1775959351

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000ff830ce17d39bbd6a4fef9683308d793df8e34fc
Arg [1] : 000000000000000000000000ff830ce17d39bbd6a4fef9683308d793df8e34fc
Arg [2] : 0000000000000000000000000000000000000000000000000000000069dafd37


Deployed Bytecode Sourcemap

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Swarm Source

ipfs://39840fd33b6c0f40588ce6f70f58be5ce1cf8c8fa79a676880dd051e5e73bb16

Block Transaction Difficulty Gas Used Reward
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Block Uncle Number Difficulty Gas Used Reward
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OVERVIEW

Hashflow is a decentralized exchange designed for interoperability, zero slippage, and MEV-protected trades. It allows users to trade any asset on any chain in seconds simply by connecting to their wallet.

Validator Index Block Amount
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Transaction Hash Block Value Eth2 PubKey Valid
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.