Contract 0x321162Cd933E2Be498Cd2267a90534A804051b11 9

Txn Hash Method
Block
From
To
Value [Txn Fee]
0x02f75c147a62d38fc672c8a97572b812fc8783c5aafbabdc91753d90b2f0b60dApprove384820912022-05-18 2:28:5810 mins ago0x959d7987d9d03583e801905a95624084a7f16645 IN  Wrapped BTC Token0 FTM0.122174444
0xa799a56450e4cc4463193760c6c9dfffc3c087ae2cac53c8465739d8ca04c5b9Approve384792092022-05-18 1:24:131 hr 15 mins ago0xe83f5e12f5e8ed9a113a41dad4bda9a5a9bb68ad IN  Wrapped BTC Token0 FTM0.012619018385
0x3934782b0073471104ae813d179edcf069df72ce3915964b0536e5c9baa738f9Approve384763332022-05-18 0:29:302 hrs 10 mins ago0xdf3259073a3a272781730874c177252684527662 IN  Wrapped BTC Token0 FTM0.011731631331
0x6881487afd979b4221078251c046d645963d31d6be845fc99aad7a3234a47873Approve384748092022-05-17 23:58:552 hrs 40 mins ago0x7c9457a775015eee6e098cb1a4ba6cf9b0fdf3c0 IN  Wrapped BTC Token0 FTM0.006205270352
0x7a27b5e37c91037d30ed244a4528a4e18b24d3b0a0d45b468fc518afd89dd5beApprove384747922022-05-17 23:58:362 hrs 40 mins ago0x7c9457a775015eee6e098cb1a4ba6cf9b0fdf3c0 IN  Wrapped BTC Token0 FTM0.006205270352
0x05c2106cb99d221f53bc2dcbe9d0ad6573aa9fc6efc4c52a3845b4ceb0e4c1f8Approve384742772022-05-17 23:48:212 hrs 51 mins ago0x0750fc524426469f7e738b13ea25cb57d717cef3 IN  Wrapped BTC Token0 FTM0.012000973377
0x3ab1cca09cedfd67707ec25fdd0263fe2c8999c8c6e4ab6dc507daf8d614a92bApprove384742752022-05-17 23:48:202 hrs 51 mins ago0x83da9b40667b97257dc1017957470b0fa65239ac IN  Wrapped BTC Token0 FTM0.012046238583
0x93b7e4df8a78cba0bfc03c162d3f81afaeab27ba8c189b49c82273b4966fef28Approve384735752022-05-17 23:35:003 hrs 4 mins ago0x0311447b23e00e0aed6d393213b010838185f846 IN  Wrapped BTC Token0 FTM0.014117014615
0x52c8ee2e1db892793408cf05e3a761a621d19d0b969fbf58d3e185311dce6c61Approve384720162022-05-17 23:04:493 hrs 34 mins ago0x9fb470376f12af151c9ce88bf7b4acaa13bad02b IN  Wrapped BTC Token0 FTM0.014105259051
0x3840f3ebc4f536f3d6bb5327bc80f98d04e2d98137d7093606733102a038dd32Approve384718212022-05-17 23:01:213 hrs 38 mins ago0x92fa1a4b372e1e5e6c281d464d01cf8c1026045e IN  Wrapped BTC Token0 FTM0.015594481413
0xf116da5b36278f9bb6fbba091294ff692f47dbda27d72b7ac4b09198b7a8e1acApprove384715312022-05-17 22:56:033 hrs 43 mins ago0x9fb470376f12af151c9ce88bf7b4acaa13bad02b IN  Wrapped BTC Token0 FTM0.016927840238
0x5215a6bc165054cab8a3701537a70133bc03ec630397c0b32d60fc7f1bea1db3Approve384712402022-05-17 22:49:533 hrs 49 mins ago0xe3ffc1902b56fa08d68538fe0036c211f891ada5 IN  Wrapped BTC Token0 FTM0.016752757242
0xb5ec69482c0bf16c0ca45df1f15f821e43b0574beba9fdd09b9e248228c7b8c6Approve384708802022-05-17 22:41:393 hrs 57 mins ago0x02d9cd8f4b86421bfef64deaac6afe246eefaa0b IN  Wrapped BTC Token0 FTM0.013024952401
0xc338d07a31a67a7c67ce7b8c88481c1db4688264abac95fb715012c188253629Transfer384696132022-05-17 22:16:394 hrs 22 mins ago0xf9e25ce468bdacfa8e5686dd1f455fb6338ba96a IN  Wrapped BTC Token0 FTM0.014363097107
0x2bbdec837a6436b8e9a78a554a82302477a1e4a8811868d43279d859a13b92d4Approve384692302022-05-17 22:09:414 hrs 29 mins ago0x649a9b3a73abe36e3eb145b641e5a181e2f3fa2e IN  Wrapped BTC Token0 FTM0.014559679505
0x3dd229490694d10253e19df26ab99131c9d8978b2d28b3cafb977a227cf0dd8dApprove384690352022-05-17 22:06:194 hrs 33 mins ago0x199be825fa1d5f346f41956da42bd3479055c5a6 IN  Wrapped BTC Token0 FTM0.016972887518
0x8863b69448d98ec5e10c65dbfdb4ff3879e2f192a11faffb29b56038fbbfd3b3Transfer384688262022-05-17 22:02:094 hrs 37 mins ago0x5be7d2d08cf474590734b0ea0a8a201ceb880355 IN  Wrapped BTC Token0 FTM0.010386980153
0xf079ae67188945e7cde92f367ccad7aebad7f359b7910f3923e66dc9f69b02bdTransfer384687072022-05-17 22:00:164 hrs 39 mins ago0x5be7d2d08cf474590734b0ea0a8a201ceb880355 IN  Wrapped BTC Token0 FTM0.018110108089
0x02d2ab97e62c3eb374d10050abbb0d9eabf5fcdf70bcf9d989b7ee49fa12e926Approve384685682022-05-17 21:57:524 hrs 41 mins ago0xe095a6031935ca1d06d3976c2ff148db7931b9bf IN  Wrapped BTC Token0 FTM0.0294279048
0x2406312d74d2364d6c09d75da6b524e1643b179b0941a312b11b62674e05308dApprove384685122022-05-17 21:56:434 hrs 42 mins ago0x199be825fa1d5f346f41956da42bd3479055c5a6 IN  Wrapped BTC Token0 FTM0.017610307962
0x2679da58bcde794498e259f483492568957198d1f4300eedc7e4d833f27243e4Approve384681822022-05-17 21:49:484 hrs 49 mins ago0x5be7d2d08cf474590734b0ea0a8a201ceb880355 IN  Wrapped BTC Token0 FTM0.014859372719
0x863fccd79a3453aebd6c9ba0f87ef7bf292016cdb3aea9b601e7545e46964032Approve384681302022-05-17 21:48:504 hrs 50 mins ago0x199be825fa1d5f346f41956da42bd3479055c5a6 IN  Wrapped BTC Token0 FTM0.015674439144
0xdb749329f1cf38627e1bac92ce6c0f686d785c227a51febcf6ac88d69af1c0dbApprove384676152022-05-17 21:38:455 hrs ago0xea3b5683de5f4cca2adf1e8458adcca2413dccf7 IN  Wrapped BTC Token0 FTM0.016958385374
0xdb645a9aa3331aea38ec0949a1f54f2cd78cc13a8963b0c6495618805aecc61bApprove384670402022-05-17 21:27:555 hrs 11 mins ago0xb94eb5a8f69d80a0a8aa90226f406d99ec62cf84 IN  Wrapped BTC Token0 FTM0.015527159919
0xc03e732fce59c2bf25b0a904ed58aae4202069c8ee7596d770adac16c445a85fApprove384669562022-05-17 21:26:175 hrs 13 mins ago0x947feedd17bad9420a0a8651f6871768f331ff31 IN  Wrapped BTC Token0 FTM0.020744929444
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OVERVIEW

Wrapped Bitcoin (WBTC) is an ERC20 token backed 1:1 with Bitcoin. Completely transparent. 100% verifiable. Community led.

Latest 5 internal transactions
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Contract Source Code Verified (Exact Match)

Contract Name:
BTC

Compiler Version
v0.8.1+commit.df193b15

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at FtmScan.com on 2021-02-19
*/

// SPDX-License-Identifier: GPL-3.0-or-later

pragma solidity 0.8.1;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @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 Interface of the ERC2612 standard as defined in the EIP.
 *
 * Adds the {permit} method, which can be used to change one's
 * {IERC20-allowance} without having to send a transaction, by signing a
 * message. This allows users to spend tokens without having to hold Ether.
 *
 * See https://eips.ethereum.org/EIPS/eip-2612.
 */
interface IERC2612 {
    /**
     * @dev Sets `amount` as the allowance of `spender` over `owner`'s tokens,
     * given `owner`'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     */
    function permit(address owner, address spender, uint256 amount, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external;

    /**
     * @dev Returns the current ERC2612 nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);
}

/// @dev Wrapped ERC-20 v10 (WERC10) is an ERC-20 ERC-20 wrapper. You can `deposit` ERC-20 and obtain an WERC10 balance which can then be operated as an ERC-20 token. You can
/// `withdraw` ERC-20 from WERC10, which will then burn WERC10 token in your wallet. The amount of WERC10 token in any wallet is always identical to the
/// balance of ERC-20 deposited minus the ERC-20 withdrawn with that specific wallet.
interface IWERC10 is IERC20, IERC2612 {

    /// @dev Sets `value` as allowance of `spender` account over caller account's WERC10 token,
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// Emits {Approval} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// For more information on approveAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);

    /// @dev Moves `value` WERC10 token from caller's account to account (`to`), 
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// A transfer to `address(0)` triggers an ERC-20 withdraw matching the sent WERC10 token in favor of caller.
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - caller account must have at least `value` WERC10 token.
    /// For more information on transferAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function transferAndCall(address to, uint value, bytes calldata data) external returns (bool);
}

interface ITransferReceiver {
    function onTokenTransfer(address, uint, bytes calldata) external returns (bool);
}

interface IApprovalReceiver {
    function onTokenApproval(address, uint, bytes calldata) external returns (bool);
}

library Address {
    function isContract(address account) internal view returns (bool) {
        bytes32 codehash;
        bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470;
        // solhint-disable-next-line no-inline-assembly
        assembly { codehash := extcodehash(account) }
        return (codehash != 0x0 && codehash != accountHash);
    }
}

library SafeERC20 {
    using Address for address;

    function safeTransfer(IERC20 token, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value));
    }

    function safeTransferFrom(IERC20 token, address from, address to, uint value) internal {
        callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value));
    }

    function safeApprove(IERC20 token, address spender, uint value) internal {
        require((value == 0) || (token.allowance(address(this), spender) == 0),
            "SafeERC20: approve from non-zero to non-zero allowance"
        );
        callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value));
    }
    function callOptionalReturn(IERC20 token, bytes memory data) private {
        require(address(token).isContract(), "SafeERC20: call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = address(token).call(data);
        require(success, "SafeERC20: low-level call failed");

        if (returndata.length > 0) { // Return data is optional
            // solhint-disable-next-line max-line-length
            require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed");
        }
    }
}

/// @dev Wrapped Ether v10 (WERC10) is an Ether (ETH) ERC-20 wrapper. You can `deposit` ETH and obtain an WERC10 balance which can then be operated as an ERC-20 token. You can
/// `withdraw` ETH from WERC10, which will then burn WERC10 token in your wallet. The amount of WERC10 token in any wallet is always identical to the
/// balance of ETH deposited minus the ETH withdrawn with that specific wallet.
contract BTC is IWERC10 {
    using SafeERC20 for IERC20;
    string public name;
    string public symbol;
    uint8  public immutable decimals;

    bytes32 public constant PERMIT_TYPEHASH = keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant TRANSFER_TYPEHASH = keccak256("Transfer(address owner,address to,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public immutable DOMAIN_SEPARATOR;

    /// @dev Records amount of WERC10 token owned by account.
    mapping (address => uint256) public override balanceOf;
    uint256 private _totalSupply;
    
    address private _oldOwner;
    address private _newOwner;
    uint256 private _newOwnerEffectiveTime;
    
    
    modifier onlyOwner() {
        require(msg.sender == owner(), "only owner");
        _;
    }
    
    function owner() public view returns (address) {
        if (block.timestamp >= _newOwnerEffectiveTime) {
            return _newOwner;
        }
        return _oldOwner;
    }
    
    
    function changeDCRMOwner(address newOwner) public onlyOwner returns (bool) {
        require(newOwner != address(0), "new owner is the zero address");
        _oldOwner = owner();
        _newOwner = newOwner;
        _newOwnerEffectiveTime = block.timestamp + 2*24*3600;
        emit LogChangeDCRMOwner(_oldOwner, _newOwner, _newOwnerEffectiveTime);
        return true;
    }

    function Swapin(bytes32 txhash, address account, uint256 amount) public onlyOwner returns (bool) {
        _mint(account, amount);
        emit LogSwapin(txhash, account, amount);
        return true;
    }

    function Swapout(uint256 amount, address bindaddr) public returns (bool) {
        require(bindaddr != address(0), "bind address is the zero address");
        _burn(msg.sender, amount);
        emit LogSwapout(msg.sender, bindaddr, amount);
        return true;
    }

    /// @dev Records current ERC2612 nonce for account. This value must be included whenever signature is generated for {permit}.
    /// Every successful call to {permit} increases account's nonce by one. This prevents signature from being used multiple times.
    mapping (address => uint256) public override nonces;

    /// @dev Records number of WERC10 token that account (second) will be allowed to spend on behalf of another account (first) through {transferFrom}.
    mapping (address => mapping (address => uint256)) public override allowance;
    
    event LogChangeDCRMOwner(address indexed oldOwner, address indexed newOwner, uint indexed effectiveTime);
    event LogSwapin(bytes32 indexed txhash, address indexed account, uint amount);
    event LogSwapout(address indexed account, address indexed bindaddr, uint amount);
    
    constructor(string memory _name, string memory _symbol, uint8 _decimals, address _owner) {
        name = _name;
        symbol = _symbol;
        decimals = _decimals;
        
        _newOwner = _owner;
        _newOwnerEffectiveTime = block.timestamp;
        
        uint256 chainId;
        assembly {chainId := chainid()}
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)));
    }
    
    /// @dev Returns the total supply of WERC10 token as the ETH held in this contract.
    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }
    
    /** @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
     *
     * - `to` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal {
        require(account != address(0), "ERC20: mint to the zero address");

        _totalSupply += amount;
        balanceOf[account] += amount;
        emit Transfer(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 {
        require(account != address(0), "ERC20: burn from the zero address");

        balanceOf[account] -= amount;
        _totalSupply -= amount;
        emit Transfer(account, address(0), amount);
    }
    
    /// @dev Sets `value` as allowance of `spender` account over caller account's WERC10 token.
    /// Emits {Approval} event.
    /// Returns boolean value indicating whether operation succeeded.
    function approve(address spender, uint256 value) external override returns (bool) {
        // _approve(msg.sender, spender, value);
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);

        return true;
    }

    /// @dev Sets `value` as allowance of `spender` account over caller account's WERC10 token,
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// Emits {Approval} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// For more information on approveAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function approveAndCall(address spender, uint256 value, bytes calldata data) external override returns (bool) {
        // _approve(msg.sender, spender, value);
        allowance[msg.sender][spender] = value;
        emit Approval(msg.sender, spender, value);
        
        return IApprovalReceiver(spender).onTokenApproval(msg.sender, value, data);
    }

    /// @dev Sets `value` as allowance of `spender` account over `owner` account's WERC10 token, given `owner` account's signed approval.
    /// Emits {Approval} event.
    /// Requirements:
    ///   - `deadline` must be timestamp in future.
    ///   - `v`, `r` and `s` must be valid `secp256k1` signature from `owner` account over EIP712-formatted function arguments.
    ///   - the signature must use `owner` account's current nonce (see {nonces}).
    ///   - the signer cannot be zero address and must be `owner` account.
    /// For more information on signature format, see https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP section].
    /// WERC10 token implementation adapted from https://github.com/albertocuestacanada/ERC20Permit/blob/master/contracts/ERC20Permit.sol.
    function permit(address target, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external override {
        require(block.timestamp <= deadline, "WERC10: Expired permit");

        bytes32 hashStruct = keccak256(
            abi.encode(
                PERMIT_TYPEHASH,
                target,
                spender,
                value,
                nonces[target]++,
                deadline));

        require(verifyEIP712(target, hashStruct, v, r, s) || verifyPersonalSign(target, hashStruct, v, r, s));

        // _approve(owner, spender, value);
        allowance[target][spender] = value;
        emit Approval(target, spender, value);
    }

    function transferWithPermit(address target, address to, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) external returns (bool) {
        require(block.timestamp <= deadline, "WERC10: Expired permit");

        bytes32 hashStruct = keccak256(
            abi.encode(
                TRANSFER_TYPEHASH,
                target,
                to,
                value,
                nonces[target]++,
                deadline));

        require(verifyEIP712(target, hashStruct, v, r, s) || verifyPersonalSign(target, hashStruct, v, r, s));

        require(to != address(0) || to != address(this));
        
        uint256 balance = balanceOf[target];
        require(balance >= value, "WERC10: transfer amount exceeds balance");

        balanceOf[target] = balance - value;
        balanceOf[to] += value;
        emit Transfer(target, to, value);
        
        return true;
    }
    
    function verifyEIP712(address target, bytes32 hashStruct, uint8 v, bytes32 r, bytes32 s) internal view returns (bool) {
        bytes32 hash = keccak256(
            abi.encodePacked(
                "\x19\x01",
                DOMAIN_SEPARATOR,
                hashStruct));
        address signer = ecrecover(hash, v, r, s);
        return (signer != address(0) && signer == target);
    }
    
    function verifyPersonalSign(address target, bytes32 hashStruct, uint8 v, bytes32 r, bytes32 s) internal pure returns (bool) {
        bytes32 hash = prefixed(hashStruct);
        address signer = ecrecover(hash, v, r, s);
        return (signer != address(0) && signer == target);
    }
    
    // Builds a prefixed hash to mimic the behavior of eth_sign.
    function prefixed(bytes32 hash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /// @dev Moves `value` WERC10 token from caller's account to account (`to`).
    /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WERC10 token in favor of caller.
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - caller account must have at least `value` WERC10 token.
    function transfer(address to, uint256 value) external override returns (bool) {
        require(to != address(0) || to != address(this));
        uint256 balance = balanceOf[msg.sender];
        require(balance >= value, "WERC10: transfer amount exceeds balance");

        balanceOf[msg.sender] = balance - value;
        balanceOf[to] += value;
        emit Transfer(msg.sender, to, value);
        
        return true;
    }

    /// @dev Moves `value` WERC10 token from account (`from`) to account (`to`) using allowance mechanism.
    /// `value` is then deducted from caller account's allowance, unless set to `type(uint256).max`.
    /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WERC10 token in favor of caller.
    /// Emits {Approval} event to reflect reduced allowance `value` for caller account to spend from account (`from`),
    /// unless allowance is set to `type(uint256).max`
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - `from` account must have at least `value` balance of WERC10 token.
    ///   - `from` account must have approved caller to spend at least `value` of WERC10 token, unless `from` and caller are the same account.
    function transferFrom(address from, address to, uint256 value) external override returns (bool) {
        require(to != address(0) || to != address(this));
        if (from != msg.sender) {
            // _decreaseAllowance(from, msg.sender, value);
            uint256 allowed = allowance[from][msg.sender];
            if (allowed != type(uint256).max) {
                require(allowed >= value, "WERC10: request exceeds allowance");
                uint256 reduced = allowed - value;
                allowance[from][msg.sender] = reduced;
                emit Approval(from, msg.sender, reduced);
            }
        }
        
        uint256 balance = balanceOf[from];
        require(balance >= value, "WERC10: transfer amount exceeds balance");

        balanceOf[from] = balance - value;
        balanceOf[to] += value;
        emit Transfer(from, to, value);
        
        return true;
    }

    /// @dev Moves `value` WERC10 token from caller's account to account (`to`), 
    /// after which a call is executed to an ERC677-compliant contract with the `data` parameter.
    /// A transfer to `address(0)` triggers an ETH withdraw matching the sent WERC10 token in favor of caller.
    /// Emits {Transfer} event.
    /// Returns boolean value indicating whether operation succeeded.
    /// Requirements:
    ///   - caller account must have at least `value` WERC10 token.
    /// For more information on transferAndCall format, see https://github.com/ethereum/EIPs/issues/677.
    function transferAndCall(address to, uint value, bytes calldata data) external override returns (bool) {
        require(to != address(0) || to != address(this));
        
        uint256 balance = balanceOf[msg.sender];
        require(balance >= value, "WERC10: transfer amount exceeds balance");

        balanceOf[msg.sender] = balance - value;
        balanceOf[to] += value;
        emit Transfer(msg.sender, to, value);

        return ITransferReceiver(to).onTokenTransfer(msg.sender, value, data);
    }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"},{"internalType":"uint8","name":"_decimals","type":"uint8"},{"internalType":"address","name":"_owner","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"},{"indexed":true,"internalType":"uint256","name":"effectiveTime","type":"uint256"}],"name":"LogChangeDCRMOwner","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"txhash","type":"bytes32"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"LogSwapin","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":true,"internalType":"address","name":"bindaddr","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"LogSwapout","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"inputs":[],"name":"DOMAIN_SEPARATOR","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"PERMIT_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"txhash","type":"bytes32"},{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Swapin","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"bindaddr","type":"address"}],"name":"Swapout","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"TRANSFER_TYPEHASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"approveAndCall","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"changeDCRMOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"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":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"value","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":[],"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":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"transferAndCall","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":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","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":"transferWithPermit","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)

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

-----Decoded View---------------
Arg [0] : _name (string): Bitcoin
Arg [1] : _symbol (string): BTC
Arg [2] : _decimals (uint8): 8
Arg [3] : _owner (address): 0xc564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe

-----Encoded View---------------
8 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000080
Arg [1] : 00000000000000000000000000000000000000000000000000000000000000c0
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000008
Arg [3] : 000000000000000000000000c564ee9f21ed8a2d8e7e76c085740d5e4c5fafbe
Arg [4] : 0000000000000000000000000000000000000000000000000000000000000007
Arg [5] : 426974636f696e00000000000000000000000000000000000000000000000000
Arg [6] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [7] : 4254430000000000000000000000000000000000000000000000000000000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://ff619331180b8bf5193942ec45932f187d56074080b3d2f8fceb035b3b4dbfd1
Block Transaction Gas Used Reward
Age Block Fee Address BC Fee Address Voting Power Jailed Incoming
Validator ID :
0 FTM

Amount Staked
0

Amount Delegated
0

Staking Total
0

Staking Start Epoch
0

Staking Start Time
0

Proof of Importance
0

Origination Score
0

Validation Score
0

Active
0

Online
0

Downtime
0 s
Address Amount claimed Rewards Created On Epoch Created On
Block Uncle Number Difficulty Gas Used Reward
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