ETH Price: $2,519.81 (+3.23%)
Gas: 0.94 Gwei

Contract

0xBAa9f4AAe0a04C998b622eBB880d98B883a1BB89
 

Overview

ETH Balance

0 ETH

Eth Value

$0.00

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Transaction Hash
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Block
From
To
Approve175848432023-06-29 12:05:35431 days ago1688040335IN
0xBAa9f4AA...883a1BB89
0 ETH0.0015273332.96564559
Approve175780992023-06-28 13:25:11432 days ago1687958711IN
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0 ETH0.0008259317.85
Transfer175600702023-06-26 0:32:59435 days ago1687739579IN
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0 ETH0.0005571911.91499022
Approve174735552023-06-13 20:50:23447 days ago1686689423IN
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0 ETH0.0006371913.84270708
Approve174529022023-06-10 23:02:35450 days ago1686438155IN
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0 ETH0.0007152415.5342662
Approve174504902023-06-10 14:53:47450 days ago1686408827IN
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0 ETH0.0011124524.01105964
Approve174414092023-06-09 8:10:35451 days ago1686298235IN
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0 ETH0.0008752719.03472405
Approve174412272023-06-09 7:33:47452 days ago1686296027IN
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0 ETH0.001027322.34102264
Approve174275492023-06-07 9:16:23453 days ago1686129383IN
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0 ETH0.000895519.47471413
Approve174270662023-06-07 7:38:23454 days ago1686123503IN
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0 ETH0.0009751621.20697005
Approve174258852023-06-07 3:37:11454 days ago1686109031IN
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0 ETH0.0009172519.82345368
Approve174226512023-06-06 16:40:47454 days ago1686069647IN
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0 ETH0.001305828.18418264
Approve174145822023-06-05 13:21:59455 days ago1685971319IN
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0 ETH0.0031375667.72074605
Approve174135942023-06-05 10:00:59455 days ago1685959259IN
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0 ETH0.0010785523.3095176
Approve174134622023-06-05 9:34:11455 days ago1685957651IN
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0 ETH0.0009408120.33272708
Approve174131402023-06-05 8:28:59455 days ago1685953739IN
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0 ETH0.0009567220.64976205
Approve174131052023-06-05 8:21:59455 days ago1685953319IN
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0 ETH0.0010702423.1
Approve174129462023-06-05 7:49:35456 days ago1685951375IN
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0 ETH0.0010215922.05
Approve174126262023-06-05 6:44:11456 days ago1685947451IN
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0 ETH0.0009705220.97489721
Mint174123052023-06-05 5:38:47456 days ago1685943527IN
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0.0099 ETH0.0021623419.24907564
Mint174122982023-06-05 5:37:23456 days ago1685943443IN
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0.0099 ETH0.0014939619.12025338
Mint174122942023-06-05 5:36:35456 days ago1685943395IN
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0.0099 ETH0.0020474418.22621067
Mint174122642023-06-05 5:30:35456 days ago1685943035IN
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0.0099 ETH0.0021711219.32719277
Mint174122542023-06-05 5:28:23456 days ago1685942903IN
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0.0099 ETH0.0021095618.77922902
Mint174122472023-06-05 5:26:59456 days ago1685942819IN
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0.0099 ETH0.0022065919.64506748
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174123052023-06-05 5:38:47456 days ago1685943527
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174123052023-06-05 5:38:47456 days ago1685943527
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0.009801 ETH
174122982023-06-05 5:37:23456 days ago1685943443
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174122982023-06-05 5:37:23456 days ago1685943443
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174122942023-06-05 5:36:35456 days ago1685943395
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174122542023-06-05 5:28:23456 days ago1685942903
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174122472023-06-05 5:26:59456 days ago1685942819
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174122122023-06-05 5:19:47456 days ago1685942387
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174121882023-06-05 5:14:47456 days ago1685942087
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174121292023-06-05 5:02:47456 days ago1685941367
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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x37BAb2BE...435C90627
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:
Inscription

Compiler Version
v0.8.18+commit.87f61d96

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license
File 1 of 7 : InscriptionV2.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./Logarithm.sol";
import "./TransferHelper.sol";

// This is common token interface, get balance of owner's token by ERC20/ERC721/ERC1155.
interface ICommonToken {
    function balanceOf(address owner) external returns(uint256);
}

// This contract is extended from ERC20
contract Inscription is ERC20 {
    using Logarithm for int256;
    uint256 public cap;                 // Max amount
    uint256 public limitPerMint;        // Limitaion of each mint
    uint256 public inscriptionId;       // Inscription Id
    uint256 public maxMintSize;         // max mint size, that means the max mint quantity is: maxMintSize * limitPerMint
    uint256 public freezeTime;          // The frozen time (interval) between two mints is a fixed number of seconds. You can mint, but you will need to pay an additional mint fee, and this fee will be double for each mint.
    address public onlyContractAddress; // Only addresses that hold these assets can mint
    uint256 public onlyMinQuantity;     // Only addresses that the quantity of assets hold more than this amount can mint
    uint256 public baseFee;             // base fee of the second mint after frozen interval. The first mint after frozen time is free.
    uint256 public fundingCommission;   // commission rate of fund raising, 100 means 1%
    uint256 public crowdFundingRate;    // rate of crowdfunding
    address payable public crowdfundingAddress; // receiving fee of crowdfunding
    address payable public inscriptionFactory;

    mapping(address => uint256) public lastMintTimestamp;   // record the last mint timestamp of account
    mapping(address => uint256) public lastMintFee;           // record the last mint fee

    constructor(
        string memory _name,            // token name
        string memory _tick,            // token tick, same as symbol. must be 4 characters.
        uint256 _cap,                   // Max amount
        uint256 _limitPerMint,          // Limitaion of each mint
        uint256 _inscriptionId,         // Inscription Id
        uint256 _maxMintSize,           // max mint size, that means the max mint quantity is: maxMintSize * limitPerMint. This is only availabe for non-frozen time token.
        uint256 _freezeTime,            // The frozen time (interval) between two mints is a fixed number of seconds. You can mint, but you will need to pay an additional mint fee, and this fee will be double for each mint.
        address _onlyContractAddress,   // Only addresses that hold these assets can mint
        uint256 _onlyMinQuantity,       // Only addresses that the quantity of assets hold more than this amount can mint
        uint256 _baseFee,               // base fee of the second mint after frozen interval. The first mint after frozen time is free.
        uint256 _fundingCommission,     // commission rate of fund raising, 100 means 1%
        uint256 _crowdFundingRate,      // rate of crowdfunding
        address payable _crowdFundingAddress,   // receiving fee of crowdfunding
        address payable _inscriptionFactory
    ) ERC20(_name, _tick) {
        require(_cap >= _limitPerMint, "Limit per mint exceed cap");
        cap = _cap;
        limitPerMint = _limitPerMint;
        inscriptionId = _inscriptionId;
        maxMintSize = _maxMintSize;
        freezeTime = _freezeTime;
        onlyContractAddress = _onlyContractAddress;
        onlyMinQuantity = _onlyMinQuantity;
        baseFee = _baseFee;
        fundingCommission = _fundingCommission;
        crowdFundingRate = _crowdFundingRate;
        crowdfundingAddress = _crowdFundingAddress;
        inscriptionFactory = _inscriptionFactory;
    }

    function mint(address _to) payable public {
        // Check if the quantity after mint will exceed the cap
        require(totalSupply() + limitPerMint <= cap, "Touched cap");
        // Check if the assets in the msg.sender is satisfied
        require(onlyContractAddress == address(0x0) || ICommonToken(onlyContractAddress).balanceOf(msg.sender) >= onlyMinQuantity, "You don't have required assets");
        require(lastMintTimestamp[msg.sender] < block.timestamp, "Timestamp fail");
        
        if(lastMintTimestamp[msg.sender] + freezeTime > block.timestamp) {
            // The min extra tip is double of last mint fee
            lastMintFee[msg.sender] = lastMintFee[msg.sender] == 0 ? baseFee : lastMintFee[msg.sender] * 2;
            // Transfer the fee to the crowdfunding address
            if(crowdFundingRate > 0) {
                // Check if the tip is high than the min extra fee
                require(msg.value >= crowdFundingRate + lastMintFee[msg.sender], "Send some ETH as fee and crowdfunding");
                _dispatchFunding(crowdFundingRate);
            }
            // Transfer the tip to InscriptionFactory smart contract
            if(msg.value - crowdFundingRate > 0) TransferHelper.safeTransferETH(inscriptionFactory, msg.value - crowdFundingRate);
            // Do mint
            _mint(_to, limitPerMint);
        } else {
            // Transfer the fee to the crowdfunding address
            if(crowdFundingRate > 0) {
                require(msg.value >= crowdFundingRate, "Send some ETH as crowdfunding");
                _dispatchFunding(msg.value);
            }
            // Out of frozen time, free mint. Reset the timestamp and mint times.
            lastMintFee[msg.sender] = 0;
            lastMintTimestamp[msg.sender] = block.timestamp;
            // Do mint
            _mint(_to, limitPerMint);
        }
    }

    // batch mint is only available for non-frozen-time tokens
    function batchMint(address _to, uint256 _num) payable public {
        require(_num <= maxMintSize, "exceed max mint size");
        require(totalSupply() + _num * limitPerMint <= cap, "Touch cap");
        require(freezeTime == 0, "Batch mint only for non-frozen token");
        require(onlyContractAddress == address(0x0) || ICommonToken(onlyContractAddress).balanceOf(msg.sender) >= onlyMinQuantity, "You don't have required assets");
        if(crowdFundingRate > 0) {
            require(msg.value >= crowdFundingRate * _num, "Crowdfunding ETH not enough");
            _dispatchFunding(msg.value);
        }
        for(uint256 i = 0; i < _num; i++) _mint(_to, limitPerMint);
    }

    function getMintFee(address _addr) public view returns(uint256 mintedTimes, uint256 nextMintFee) {
        if(lastMintTimestamp[_addr] + freezeTime > block.timestamp) {
            int256 scale = 1e18;
            int256 halfScale = 5e17;
            // times = log_2(lastMintFee / baseFee) + 1 (if lastMintFee > 0)
            nextMintFee = lastMintFee[_addr] == 0 ? baseFee : lastMintFee[_addr] * 2;
            mintedTimes = uint256((Logarithm.log2(int256(nextMintFee / baseFee) * scale, scale, halfScale) + 1) / scale) + 1;
        }
    }

    function _dispatchFunding(uint256 _amount) private {
        uint256 commission = _amount * fundingCommission / 10000;
        TransferHelper.safeTransferETH(crowdfundingAddress, _amount - commission);
        if(commission > 0) TransferHelper.safeTransferETH(inscriptionFactory, commission);
    }
}

File 2 of 7 : TransferHelper.sol
// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity >=0.6.0;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
    }
}

File 3 of 7 : Logarithm.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

library Logarithm {
    /// @notice Finds the zero-based index of the first one in the binary representation of x.
    /// @dev See the note on msb in the "Find First Set" Wikipedia article https://en.wikipedia.org/wiki/Find_first_set
    /// @param x The uint256 number for which to find the index of the most significant bit.
    /// @return msb The index of the most significant bit as an uint256.
    function mostSignificantBit(uint256 x) internal pure returns (uint256 msb) {
        if (x >= 2**128) {
            x >>= 128;
            msb += 128;
        }
        if (x >= 2**64) {
            x >>= 64;
            msb += 64;
        }
        if (x >= 2**32) {
            x >>= 32;
            msb += 32;
        }
        if (x >= 2**16) {
            x >>= 16;
            msb += 16;
        }
        if (x >= 2**8) {
            x >>= 8;
            msb += 8;
        }
        if (x >= 2**4) {
            x >>= 4;
            msb += 4;
        }
        if (x >= 2**2) {
            x >>= 2;
            msb += 2;
        }
        if (x >= 2**1) {
            // No need to shift x any more.
            msb += 1;
        }
    }
    /// @notice Calculates the binary logarithm of x.
    ///
    /// @dev Based on the iterative approximation algorithm.
    /// https://en.wikipedia.org/wiki/Binary_logarithm#Iterative_approximation
    ///
    /// Requirements:
    /// - x must be greater than zero.
    ///
    /// Caveats:
    /// - The results are nor perfectly accurate to the last digit, due to the lossy precision of the iterative approximation.
    ///
    /// @param x The signed 59.18-decimal fixed-point number for which to calculate the binary logarithm.
    /// @return result The binary logarithm as a signed 59.18-decimal fixed-point number.
    function log2(int256 x, int256 scale, int256 halfScale) internal pure returns (int256 result) {
        require(x > 0);
        unchecked {
            // This works because log2(x) = -log2(1/x).
            int256 sign;
            if (x >= scale) {
                sign = 1;
            } else {
                sign = -1;
                // Do the fixed-point inversion inline to save gas. The numerator is SCALE * SCALE.
                assembly {
                    x := div(1000000000000000000000000000000000000, x)
                }
            }

            // Calculate the integer part of the logarithm and add it to the result and finally calculate y = x * 2^(-n).
            uint256 n = mostSignificantBit(uint256(x / scale));

            // The integer part of the logarithm as a signed 59.18-decimal fixed-point number. The operation can't overflow
            // because n is maximum 255, SCALE is 1e18 and sign is either 1 or -1.
            result = int256(n) * scale;

            // This is y = x * 2^(-n).
            int256 y = x >> n;

            // If y = 1, the fractional part is zero.
            if (y == scale) {
                return result * sign;
            }

            // Calculate the fractional part via the iterative approximation.
            // The "delta >>= 1" part is equivalent to "delta /= 2", but shifting bits is faster.
            for (int256 delta = int256(halfScale); delta > 0; delta >>= 1) {
                y = (y * y) / scale;

                // Is y^2 > 2 and so in the range [2,4)?
                if (y >= 2 * scale) {
                    // Add the 2^(-m) factor to the logarithm.
                    result += delta;

                    // Corresponds to z/2 on Wikipedia.
                    y >>= 1;
                }
            }
            result *= sign;
        }
    }
}

File 4 of 7 : ERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

File 5 of 7 : Context.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/Context.sol)

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

File 6 of 7 : IERC20Metadata.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

File 7 of 7 : IERC20.sol
// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
}

Settings
{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "abi"
      ]
    }
  },
  "viaIR": true
}

Contract Security Audit

Contract ABI

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payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"freezeTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fundingCommission","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_addr","type":"address"}],"name":"getMintFee","outputs":[{"internalType":"uint256","name":"mintedTimes","type":"uint256"},{"internalType":"uint256","name":"nextMintFee","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"inscriptionFactory","outputs":[{"internalType":"address payable","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"inscriptionId","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastMintFee","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastMintTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"limitPerMint","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxMintSize","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"}],"name":"mint","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"onlyContractAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"onlyMinQuantity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","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":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"}]

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Swarm Source

ipfs://cac9a4b804f7492f76ed40e8e1d0bdd7608244db59460f2b5d93032e9759f3f0

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